1 ===================
2 Customising Roundup
3 ===================
5 :Version: $Revision: 1.93 $
7 .. This document borrows from the ZopeBook section on ZPT. The original is at:
8 http://www.zope.org/Documentation/Books/ZopeBook/current/ZPT.stx
10 .. contents::
11 :depth: 1
13 What You Can Do
14 ===============
16 Before you get too far, it's probably worth having a quick read of the Roundup
17 `design documentation`_.
19 Customisation of Roundup can take one of five forms:
21 1. `tracker configuration`_ file changes
22 2. database, or `tracker schema`_ changes
23 3. "definition" class `database content`_ changes
24 4. behavioural changes, through detectors_
25 5. `access controls`_
26 6. change the `web interface`_
28 The third case is special because it takes two distinctly different forms
29 depending upon whether the tracker has been initialised or not. The other two
30 may be done at any time, before or after tracker initialisation. Yes, this
31 includes adding or removing properties from classes.
34 Trackers in a Nutshell
35 ======================
37 Trackers have the following structure:
39 =================== ========================================================
40 Tracker File Description
41 =================== ========================================================
42 config.py Holds the basic `tracker configuration`_
43 dbinit.py Holds the `tracker schema`_
44 interfaces.py Defines the Web and E-Mail interfaces for the tracker
45 select_db.py Selects the database back-end for the tracker
46 db/ Holds the tracker's database
47 db/files/ Holds the tracker's upload files and messages
48 detectors/ Auditors and reactors for this tracker
49 html/ Web interface templates, images and style sheets
50 =================== ========================================================
52 Tracker Configuration
53 =====================
55 The ``config.py`` located in your tracker home contains the basic
56 configuration for the web and e-mail components of roundup's interfaces.
57 As the name suggests, this file is a Python module. This means that any
58 valid python expression may be used in the file. Mostly though, you'll
59 be setting the configuration variables to string values. Python string
60 values must be quoted with either single or double quotes::
62 'this is a string'
63 "this is also a string - use it when the value has 'single quotes'"
64 this is not a string - it's not quoted
66 Python strings may use formatting that's almost identical to C string
67 formatting. The ``%`` operator is used to perform the formatting, like
68 so::
70 'roundup-admin@%s'%MAIL_DOMAIN
72 this will create a string ``'roundup-admin@tracker.domain.example'`` if
73 MAIL_DOMAIN is set to ``'tracker.domain.example'``.
75 You'll also note some values are set to::
77 os.path.join(TRACKER_HOME, 'db')
79 or similar. This creates a new string which holds the path to the
80 ``'db'`` directory in the TRACKER_HOME directory. This is just a
81 convenience so if the TRACKER_HOME changes you don't have to edit
82 multiple valoues.
84 The configuration variables available are:
86 **TRACKER_HOME** - ``os.path.split(__file__)[0]``
87 The tracker home directory. The above default code will automatically
88 determine the tracker home for you, so you can just leave it alone.
90 **MAILHOST** - ``'localhost'``
91 The SMTP mail host that roundup will use to send e-mail.
93 **MAILUSER** - ``()``
94 If your SMTP mail host requires a username and password for access, then
95 specify them here. eg. ``MAILUSER = ('username', 'password')``
97 **MAILHOST_TLS** - ``'no'``
98 If your SMTP mail host provides or requires TLS (Transport Layer
99 Security) then set ``MAILHOST_TLS = 'yes'``
101 **MAILHOST_TLS_KEYFILE** - ``''``
102 If you're using TLS, you may also set MAILHOST_TLS_KEYFILE to the name of
103 a PEM formatted file that contains your private key.
105 **MAILHOST_TLS_CERTFILE** - ``''``
106 If you're using TLS and have specified a MAILHOST_TLS_KEYFILE, you may
107 also set MAILHOST_TLS_CERTFILE to the name of a PEM formatted certificate
108 chain file.
110 **MAIL_DOMAIN** - ``'tracker.domain.example'``
111 The domain name used for email addresses.
113 **DATABASE** - ``os.path.join(TRACKER_HOME, 'db')``
114 This is the directory that the database is going to be stored in. By default
115 it is in the tracker home.
117 **TEMPLATES** - ``os.path.join(TRACKER_HOME, 'html')``
118 This is the directory that the HTML templates reside in. By default they are
119 in the tracker home.
121 **TRACKER_NAME** - ``'Roundup issue tracker'``
122 A descriptive name for your roundup tracker. This is sent out in e-mails and
123 appears in the heading of CGI pages.
125 **TRACKER_EMAIL** - ``'issue_tracker@%s'%MAIL_DOMAIN``
126 The email address that e-mail sent to roundup should go to. Think of it as the
127 tracker's personal e-mail address.
129 **TRACKER_WEB** - ``'http://tracker.example/cgi-bin/roundup.cgi/bugs/'``
130 The web address that the tracker is viewable at. This will be included in
131 information sent to users of the tracker. The URL **must** include the
132 cgi-bin part or anything else that is required to get to the home page of
133 the tracker. You **must** include a trailing '/' in the URL.
135 **ADMIN_EMAIL** - ``'roundup-admin@%s'%MAIL_DOMAIN``
136 The email address that roundup will complain to if it runs into trouble.
138 **EMAIL_FROM_TAG** - ``''``
139 Additional text to include in the "name" part of the ``From:`` address used
140 in nosy messages. If the sending user is "Foo Bar", the ``From:`` line is
141 usually::
143 "Foo Bar" <issue_tracker@tracker.example>
145 The EMAIL_FROM_TAG goes inside the "Foo Bar" quotes like so::
147 "Foo Bar EMAIL_FROM_TAG" <issue_tracker@tracker.example>
149 **MESSAGES_TO_AUTHOR** - ``'new'``, ``'yes'`` or``'no'``
150 Send nosy messages to the author of the message?
151 If 'new' is used, then the author will only be sent the message when the
152 message creates a new issue. If 'yes' then the author will always be sent
153 a copy of the message they wrote.
155 **ADD_AUTHOR_TO_NOSY** - ``'new'``, ``'yes'`` or ``'no'``
156 Does the author of a message get placed on the nosy list automatically?
157 If ``'new'`` is used, then the author will only be added when a message
158 creates a new issue. If ``'yes'``, then the author will be added on followups
159 too. If ``'no'``, they're never added to the nosy.
161 **ADD_RECIPIENTS_TO_NOSY** - ``'new'``, ``'yes'`` or ``'no'``
162 Do the recipients (To:, Cc:) of a message get placed on the nosy list?
163 If ``'new'`` is used, then the recipients will only be added when a message
164 creates a new issue. If ``'yes'``, then the recipients will be added on
165 followups too. If ``'no'``, they're never added to the nosy.
167 **EMAIL_SIGNATURE_POSITION** - ``'top'``, ``'bottom'`` or ``'none'``
168 Where to place the email signature in messages that Roundup generates.
170 **EMAIL_KEEP_QUOTED_TEXT** - ``'yes'`` or ``'no'``
171 Keep email citations. Citations are the part of e-mail which the sender has
172 quoted in their reply to previous e-mail.
174 **EMAIL_LEAVE_BODY_UNCHANGED** - ``'no'``
175 Preserve the email body as is. Enabiling this will cause the entire message
176 body to be stored, including all citations and signatures. It should be
177 either ``'yes'`` or ``'no'``.
179 **MAIL_DEFAULT_CLASS** - ``'issue'`` or ``''``
180 Default class to use in the mailgw if one isn't supplied in email
181 subjects. To disable, comment out the variable below or leave it blank.
183 The default config.py is given below - as you
184 can see, the MAIL_DOMAIN must be edited before any interaction with the
185 tracker is attempted.::
187 # roundup home is this package's directory
188 TRACKER_HOME=os.path.split(__file__)[0]
190 # The SMTP mail host that roundup will use to send mail
191 MAILHOST = 'localhost'
193 # The domain name used for email addresses.
194 MAIL_DOMAIN = 'your.tracker.email.domain.example'
196 # This is the directory that the database is going to be stored in
197 DATABASE = os.path.join(TRACKER_HOME, 'db')
199 # This is the directory that the HTML templates reside in
200 TEMPLATES = os.path.join(TRACKER_HOME, 'html')
202 # A descriptive name for your roundup tracker
203 TRACKER_NAME = 'Roundup issue tracker'
205 # The email address that mail to roundup should go to
206 TRACKER_EMAIL = 'issue_tracker@%s'%MAIL_DOMAIN
208 # The web address that the tracker is viewable at. This will be
209 # included in information sent to users of the tracker. The URL MUST
210 # include the cgi-bin part or anything else that is required to get
211 # to the home page of the tracker. You MUST include a trailing '/'
212 # in the URL.
213 TRACKER_WEB = 'http://tracker.example/cgi-bin/roundup.cgi/bugs/'
215 # The email address that roundup will complain to if it runs into
216 # trouble
217 ADMIN_EMAIL = 'roundup-admin@%s'%MAIL_DOMAIN
219 # Additional text to include in the "name" part of the From: address
220 # used in nosy messages. If the sending user is "Foo Bar", the From:
221 # line is usually: "Foo Bar" <issue_tracker@tracker.example>
222 # the EMAIL_FROM_TAG goes inside the "Foo Bar" quotes like so:
223 # "Foo Bar EMAIL_FROM_TAG" <issue_tracker@tracker.example>
224 EMAIL_FROM_TAG = ""
226 # Send nosy messages to the author of the message
227 MESSAGES_TO_AUTHOR = 'no' # either 'yes' or 'no'
229 # Does the author of a message get placed on the nosy list
230 # automatically? If 'new' is used, then the author will only be
231 # added when a message creates a new issue. If 'yes', then the
232 # author will be added on followups too. If 'no', they're never
233 # added to the nosy.
234 ADD_AUTHOR_TO_NOSY = 'new' # one of 'yes', 'no', 'new'
236 # Do the recipients (To:, Cc:) of a message get placed on the nosy
237 # list? If 'new' is used, then the recipients will only be added
238 # when a message creates a new issue. If 'yes', then the recipients
239 # will be added on followups too. If 'no', they're never added to
240 # the nosy.
241 ADD_RECIPIENTS_TO_NOSY = 'new' # either 'yes', 'no', 'new'
243 # Where to place the email signature
244 EMAIL_SIGNATURE_POSITION = 'bottom' # one of 'top', 'bottom', 'none'
246 # Keep email citations
247 EMAIL_KEEP_QUOTED_TEXT = 'no' # either 'yes' or 'no'
249 # Preserve the email body as is
250 EMAIL_LEAVE_BODY_UNCHANGED = 'no' # either 'yes' or 'no'
252 # Default class to use in the mailgw if one isn't supplied in email
253 # subjects. To disable, comment out the variable below or leave it
254 # blank. Examples:
255 MAIL_DEFAULT_CLASS = 'issue' # use "issue" class by default
256 #MAIL_DEFAULT_CLASS = '' # disable (or just comment the var out)
258 #
259 # SECURITY DEFINITIONS
260 #
261 # define the Roles that a user gets when they register with the
262 # tracker these are a comma-separated string of role names (e.g.
263 # 'Admin,User')
264 NEW_WEB_USER_ROLES = 'User'
265 NEW_EMAIL_USER_ROLES = 'User'
267 Tracker Schema
268 ==============
270 Note: if you modify the schema, you'll most likely need to edit the
271 `web interface`_ HTML template files and `detectors`_ to reflect
272 your changes.
274 A tracker schema defines what data is stored in the tracker's database.
275 Schemas are defined using Python code in the ``dbinit.py`` module of your
276 tracker. The "classic" schema looks like this (see below for the meaning
277 of ``'setkey'``)::
279 pri = Class(db, "priority", name=String(), order=String())
280 pri.setkey("name")
282 stat = Class(db, "status", name=String(), order=String())
283 stat.setkey("name")
285 keyword = Class(db, "keyword", name=String())
286 keyword.setkey("name")
288 user = Class(db, "user", username=String(), organisation=String(),
289 password=String(), address=String(), realname=String(),
290 phone=String())
291 user.setkey("username")
293 msg = FileClass(db, "msg", author=Link("user"), summary=String(),
294 date=Date(), recipients=Multilink("user"),
295 files=Multilink("file"))
297 file = FileClass(db, "file", name=String(), type=String())
299 issue = IssueClass(db, "issue", topic=Multilink("keyword"),
300 status=Link("status"), assignedto=Link("user"),
301 priority=Link("priority"))
302 issue.setkey('title')
304 Classes and Properties - creating a new information store
305 ---------------------------------------------------------
307 In the tracker above, we've defined 7 classes of information:
309 priority
310 Defines the possible levels of urgency for issues.
312 status
313 Defines the possible states of processing the issue may be in.
315 keyword
316 Initially empty, will hold keywords useful for searching issues.
318 user
319 Initially holding the "admin" user, will eventually have an entry
320 for all users using roundup.
322 msg
323 Initially empty, will hold all e-mail messages sent to or
324 generated by roundup.
326 file
327 Initially empty, will hold all files attached to issues.
329 issue
330 Initially empty, this is where the issue information is stored.
332 We define the "priority" and "status" classes to allow two things:
333 reduction in the amount of information stored on the issue and more
334 powerful, accurate searching of issues by priority and status. By only
335 requiring a link on the issue (which is stored as a single number) we
336 reduce the chance that someone mis-types a priority or status - or
337 simply makes a new one up.
340 Class and Items
341 ~~~~~~~~~~~~~~~
343 A Class defines a particular class (or type) of data that will be stored
344 in the database. A class comprises one or more properties, which gives
345 the information about the class items.
347 The actual data entered into the database, using ``class.create()``, are
348 called items. They have a special immutable property called ``'id'``. We
349 sometimes refer to this as the *itemid*.
352 Properties
353 ~~~~~~~~~~
355 A Class is comprised of one or more properties of the following types:
357 * String properties are for storing arbitrary-length strings.
358 * Password properties are for storing encoded arbitrary-length strings.
359 The default encoding is defined on the ``roundup.password.Password``
360 class.
361 * Date properties store date-and-time stamps. Their values are Timestamp
362 objects.
363 * Number properties store numeric values.
364 * Boolean properties store on/off, yes/no, true/false values.
365 * A Link property refers to a single other item selected from a
366 specified class. The class is part of the property; the value is an
367 integer, the id of the chosen item.
368 * A Multilink property refers to possibly many items in a specified
369 class. The value is a list of integers.
372 FileClass
373 ~~~~~~~~~
375 FileClasses save their "content" attribute off in a separate file from
376 the rest of the database. This reduces the number of large entries in
377 the database, which generally makes databases more efficient, and also
378 allows us to use command-line tools to operate on the files. They are
379 stored in the files sub-directory of the ``'db'`` directory in your
380 tracker.
383 IssueClass
384 ~~~~~~~~~~
386 IssueClasses automatically include the "messages", "files", "nosy", and
387 "superseder" properties.
389 The messages and files properties list the links to the messages and
390 files related to the issue. The nosy property is a list of links to
391 users who wish to be informed of changes to the issue - they get "CC'ed"
392 e-mails when messages are sent to or generated by the issue. The nosy
393 reactor (in the ``'detectors'`` directory) handles this action. The
394 superseder link indicates an issue which has superseded this one.
396 They also have the dynamically generated "creation", "activity" and
397 "creator" properties.
399 The value of the "creation" property is the date when an item was
400 created, and the value of the "activity" property is the date when any
401 property on the item was last edited (equivalently, these are the dates
402 on the first and last records in the item's journal). The "creator"
403 property holds a link to the user that created the issue.
406 setkey(property)
407 ~~~~~~~~~~~~~~~~
409 Select a String property of the class to be the key property. The key
410 property must be unique, and allows references to the items in the class
411 by the content of the key property. That is, we can refer to users by
412 their username: for example, let's say that there's an issue in roundup,
413 issue 23. There's also a user, richard, who happens to be user 2. To
414 assign an issue to him, we could do either of::
416 roundup-admin set issue23 assignedto=2
418 or::
420 roundup-admin set issue23 assignedto=richard
422 Note, the same thing can be done in the web and e-mail interfaces.
424 If a class does not have an "order" property, the key is also used to
425 sort instances of the class when it is rendered in the user interface.
426 (If a class has no "order" property, sorting is by the labelproperty of
427 the class. This is computed, in order of precedence, as the key, the
428 "name", the "title", or the first property alphabetically.)
431 create(information)
432 ~~~~~~~~~~~~~~~~~~~
434 Create an item in the database. This is generally used to create items
435 in the "definitional" classes like "priority" and "status".
438 Examples of adding to your schema
439 ---------------------------------
441 TODO
444 Detectors - adding behaviour to your tracker
445 ============================================
446 .. _detectors:
448 Detectors are initialised every time you open your tracker database, so
449 you're free to add and remove them any time, even after the database is
450 initialised via the "roundup-admin initialise" command.
452 The detectors in your tracker fire *before* (**auditors**) and *after*
453 (**reactors**) changes to the contents of your database. They are Python
454 modules that sit in your tracker's ``detectors`` directory. You will
455 have some installed by default - have a look. You can write new
456 detectors or modify the existing ones. The existing detectors installed
457 for you are:
459 **nosyreaction.py**
460 This provides the automatic nosy list maintenance and email sending.
461 The nosy reactor (``nosyreaction``) fires when new messages are added
462 to issues. The nosy auditor (``updatenosy``) fires when issues are
463 changed, and figures out what changes need to be made to the nosy list
464 (such as adding new authors, etc.)
465 **statusauditor.py**
466 This provides the ``chatty`` auditor which changes the issue status
467 from ``unread`` or ``closed`` to ``chatting`` if new messages appear.
468 It also provides the ``presetunread`` auditor which pre-sets the
469 status to ``unread`` on new items if the status isn't explicitly
470 defined.
472 See the detectors section in the `design document`__ for details of the
473 interface for detectors.
475 __ design.html
477 Sample additional detectors that have been found useful will appear in
478 the ``'detectors'`` directory of the Roundup distribution. If you want
479 to use one, copy it to the ``'detectors'`` of your tracker instance:
481 **newissuecopy.py**
482 This detector sends an email to a team address whenever a new issue is
483 created. The address is hard-coded into the detector, so edit it
484 before you use it (look for the text 'team@team.host') or you'll get
485 email errors!
487 The detector code::
489 from roundup import roundupdb
491 def newissuecopy(db, cl, nodeid, oldvalues):
492 ''' Copy a message about new issues to a team address.
493 '''
494 # so use all the messages in the create
495 change_note = cl.generateCreateNote(nodeid)
497 # send a copy to the nosy list
498 for msgid in cl.get(nodeid, 'messages'):
499 try:
500 # note: last arg must be a list
501 cl.send_message(nodeid, msgid, change_note,
502 ['team@team.host'])
503 except roundupdb.MessageSendError, message:
504 raise roundupdb.DetectorError, message
506 def init(db):
507 db.issue.react('create', newissuecopy)
510 Database Content
511 ================
513 Note: if you modify the content of definitional classes, you'll most
514 likely need to edit the tracker `detectors`_ to reflect your
515 changes.
517 Customisation of the special "definitional" classes (eg. status,
518 priority, resolution, ...) may be done either before or after the
519 tracker is initialised. The actual method of doing so is completely
520 different in each case though, so be careful to use the right one.
522 **Changing content before tracker initialisation**
523 Edit the dbinit module in your tracker to alter the items created in
524 using the ``create()`` methods.
526 **Changing content after tracker initialisation**
527 As the "admin" user, click on the "class list" link in the web
528 interface to bring up a list of all database classes. Click on the
529 name of the class you wish to change the content of.
531 You may also use the ``roundup-admin`` interface's create, set and
532 retire methods to add, alter or remove items from the classes in
533 question.
535 See "`adding a new field to the classic schema`_" for an example that
536 requires database content changes.
539 Access Controls
540 ===============
542 A set of Permissions is built into the security module by default:
544 - Edit (everything)
545 - View (everything)
547 The default interfaces define:
549 - Web Registration
550 - Web Access
551 - Web Roles
552 - Email Registration
553 - Email Access
555 These are hooked into the default Roles:
557 - Admin (Edit everything, View everything, Web Roles)
558 - User (Web Access, Email Access)
559 - Anonymous (Web Registration, Email Registration)
561 And finally, the "admin" user gets the "Admin" Role, and the "anonymous"
562 user gets "Anonymous" assigned when the database is initialised on
563 installation. The two default schemas then define:
565 - Edit issue, View issue (both)
566 - Edit file, View file (both)
567 - Edit msg, View msg (both)
568 - Edit support, View support (extended only)
570 and assign those Permissions to the "User" Role. Put together, these
571 settings appear in the ``open()`` function of the tracker ``dbinit.py``
572 (the following is taken from the "minimal" template's ``dbinit.py``)::
574 #
575 # SECURITY SETTINGS
576 #
577 # new permissions for this schema
578 for cl in ('user', ):
579 db.security.addPermission(name="Edit", klass=cl,
580 description="User is allowed to edit "+cl)
581 db.security.addPermission(name="View", klass=cl,
582 description="User is allowed to access "+cl)
584 # and give the regular users access to the web and email interface
585 p = db.security.getPermission('Web Access')
586 db.security.addPermissionToRole('User', p)
587 p = db.security.getPermission('Email Access')
588 db.security.addPermissionToRole('User', p)
590 # May users view other user information? Comment these lines out
591 # if you don't want them to
592 p = db.security.getPermission('View', 'user')
593 db.security.addPermissionToRole('User', p)
595 # Assign the appropriate permissions to the anonymous user's
596 # Anonymous role. Choices here are:
597 # - Allow anonymous users to register through the web
598 p = db.security.getPermission('Web Registration')
599 db.security.addPermissionToRole('Anonymous', p)
600 # - Allow anonymous (new) users to register through the email
601 # gateway
602 p = db.security.getPermission('Email Registration')
603 db.security.addPermissionToRole('Anonymous', p)
606 New User Roles
607 --------------
609 New users are assigned the Roles defined in the config file as:
611 - NEW_WEB_USER_ROLES
612 - NEW_EMAIL_USER_ROLES
615 Changing Access Controls
616 ------------------------
618 You may alter the configuration variables to change the Role that new
619 web or email users get, for example to not give them access to the web
620 interface if they register through email.
622 You may use the ``roundup-admin`` "``security``" command to display the
623 current Role and Permission configuration in your tracker.
626 Adding a new Permission
627 ~~~~~~~~~~~~~~~~~~~~~~~
629 When adding a new Permission, you will need to:
631 1. add it to your tracker's dbinit so it is created
632 2. enable it for the Roles that should have it (verify with
633 "``roundup-admin security``")
634 3. add it to the relevant HTML interface templates
635 4. add it to the appropriate xxxPermission methods on in your tracker
636 interfaces module
639 Example Scenarios
640 ~~~~~~~~~~~~~~~~~
642 **automatic registration of users in the e-mail gateway**
643 By giving the "anonymous" user the "Email Registration" Role, any
644 unidentified user will automatically be registered with the tracker
645 (with no password, so they won't be able to log in through the web
646 until an admin sets their password). Note: this is the default
647 behaviour in the tracker templates that ship with Roundup.
649 **anonymous access through the e-mail gateway**
650 Give the "anonymous" user the "Email Access" and ("Edit", "issue")
651 Roles but do not not give them the "Email Registration" Role. This
652 means that when an unknown user sends email into the tracker, they're
653 automatically logged in as "anonymous". Since they don't have the
654 "Email Registration" Role, they won't be automatically registered, but
655 since "anonymous" has permission to use the gateway, they'll still be
656 able to submit issues. Note that the Sender information - their email
657 address - will not be available - they're *anonymous*.
659 **only developers may be assigned issues**
660 Create a new Permission called "Fixer" for the "issue" class. Create a
661 new Role "Developer" which has that Permission, and assign that to the
662 appropriate users. Filter the list of users available in the assignedto
663 list to include only those users. Enforce the Permission with an
664 auditor. See the example
665 `restricting the list of users that are assignable to a task`_.
667 **only managers may sign off issues as complete**
668 Create a new Permission called "Closer" for the "issue" class. Create a
669 new Role "Manager" which has that Permission, and assign that to the
670 appropriate users. In your web interface, only display the "resolved"
671 issue state option when the user has the "Closer" Permissions. Enforce
672 the Permission with an auditor. This is very similar to the previous
673 example, except that the web interface check would look like::
675 <option tal:condition="python:request.user.hasPermission('Closer')"
676 value="resolved">Resolved</option>
678 **don't give web access to users who register through email**
679 Create a new Role called "Email User" which has all the Permissions of
680 the normal "User" Role minus the "Web Access" Permission. This will
681 allow users to send in emails to the tracker, but not access the web
682 interface.
684 **let some users edit the details of all users**
685 Create a new Role called "User Admin" which has the Permission for
686 editing users::
688 db.security.addRole(name='User Admin', description='Managing users')
689 p = db.security.getPermission('Edit', 'user')
690 db.security.addPermissionToRole('User Admin', p)
692 and assign the Role to the users who need the permission.
695 Web Interface
696 =============
698 .. contents::
699 :local:
700 :depth: 1
702 The web interface is provided by the ``roundup.cgi.client`` module and
703 is used by ``roundup.cgi``, ``roundup-server`` and ``ZRoundup``
704 (``ZRoundup`` is broken, until further notice). In all cases, we
705 determine which tracker is being accessed (the first part of the URL
706 path inside the scope of the CGI handler) and pass control on to the
707 tracker ``interfaces.Client`` class - which uses the ``Client`` class
708 from ``roundup.cgi.client`` - which handles the rest of the access
709 through its ``main()`` method. This means that you can do pretty much
710 anything you want as a web interface to your tracker.
712 Repercussions of changing the tracker schema
713 ---------------------------------------------
715 If you choose to change the `tracker schema`_ you will need to ensure
716 the web interface knows about it:
718 1. Index, item and search pages for the relevant classes may need to
719 have properties added or removed,
720 2. The "page" template may require links to be changed, as might the
721 "home" page's content arguments.
723 How requests are processed
724 --------------------------
726 The basic processing of a web request proceeds as follows:
728 1. figure out who we are, defaulting to the "anonymous" user
729 2. figure out what the request is for - we call this the "context"
730 3. handle any requested action (item edit, search, ...)
731 4. render the template requested by the context, resulting in HTML
732 output
734 In some situations, exceptions occur:
736 - HTTP Redirect (generally raised by an action)
737 - SendFile (generally raised by ``determine_context``)
738 here we serve up a FileClass "content" property
739 - SendStaticFile (generally raised by ``determine_context``)
740 here we serve up a file from the tracker "html" directory
741 - Unauthorised (generally raised by an action)
742 here the action is cancelled, the request is rendered and an error
743 message is displayed indicating that permission was not granted for
744 the action to take place
745 - NotFound (raised wherever it needs to be)
746 this exception percolates up to the CGI interface that called the
747 client
749 Determining web context
750 -----------------------
752 To determine the "context" of a request, we look at the URL and the
753 special request variable ``@template``. The URL path after the tracker
754 identifier is examined. Typical URL paths look like:
756 1. ``/tracker/issue``
757 2. ``/tracker/issue1``
758 3. ``/tracker/_file/style.css``
759 4. ``/cgi-bin/roundup.cgi/tracker/file1``
760 5. ``/cgi-bin/roundup.cgi/tracker/file1/kitten.png``
762 where the "tracker identifier" is "tracker" in the above cases. That means
763 we're looking at "issue", "issue1", "_file/style.css", "file1" and
764 "file1/kitten.png" in the cases above. The path is generally only one
765 entry long - longer paths are handled differently.
767 a. if there is no path, then we are in the "home" context.
768 b. if the path starts with "_file" (as in example 3,
769 "/tracker/_file/style.css"), then the additional path entry,
770 "style.css" specifies the filename of a static file we're to serve up
771 from the tracker "html" directory. Raises a SendStaticFile exception.
772 c. if there is something in the path (as in example 1, "issue"), it
773 identifies the tracker class we're to display.
774 d. if the path is an item designator (as in examples 2 and 4, "issue1"
775 and "file1"), then we're to display a specific item.
776 e. if the path starts with an item designator and is longer than one
777 entry (as in example 5, "file1/kitten.png"), then we're assumed to be
778 handling an item of a ``FileClass``, and the extra path information
779 gives the filename that the client is going to label the download
780 with (i.e. "file1/kitten.png" is nicer to download than "file1").
781 This raises a ``SendFile`` exception.
783 Both b. and e. stop before we bother to determine the template we're
784 going to use. That's because they don't actually use templates.
786 The template used is specified by the ``@template`` CGI variable, which
787 defaults to:
789 - only classname suplied: "index"
790 - full item designator supplied: "item"
793 Performing actions in web requests
794 ----------------------------------
796 When a user requests a web page, they may optionally also request for an
797 action to take place. As described in `how requests are processed`_, the
798 action is performed before the requested page is generated. Actions are
799 triggered by using a ``@action`` CGI variable, where the value is one
800 of:
802 **login**
803 Attempt to log a user in.
805 **logout**
806 Log the user out - make them "anonymous".
808 **register**
809 Attempt to create a new user based on the contents of the form and then
810 log them in.
812 **edit**
813 Perform an edit of an item in the database. There are some `special form
814 variables`_ you may use.
816 **new**
817 Add a new item to the database. You may use the same `special form
818 variables`_ as in the "edit" action.
820 **retire**
821 Retire the item in the database.
823 **editCSV**
824 Performs an edit of all of a class' items in one go. See also the
825 *class*.csv templating method which generates the CSV data to be
826 edited, and the ``'_generic.index'`` template which uses both of these
827 features.
829 **search**
830 Mangle some of the form variables:
832 - Set the form ":filter" variable based on the values of the filter
833 variables - if they're set to anything other than "dontcare" then add
834 them to :filter.
836 - Also handle the ":queryname" variable and save off the query to the
837 user's query list.
839 Each of the actions is implemented by a corresponding ``*actionAction*``
840 (where "action" is the name of the action) method on the
841 ``roundup.cgi.Client`` class, which also happens to be available in your
842 tracker instance as ``interfaces.Client``. So if you need to define new
843 actions, you may add them there (see `defining new web actions`_).
845 Each action also has a corresponding ``*actionPermission*`` (where
846 "action" is the name of the action) method which determines whether the
847 action is permissible given the current user. The base permission checks
848 are:
850 **login**
851 Determine whether the user has permission to log in. Base behaviour is
852 to check the user has "Web Access".
853 **logout**
854 No permission checks are made.
855 **register**
856 Determine whether the user has permission to register. Base behaviour
857 is to check the user has the "Web Registration" Permission.
858 **edit**
859 Determine whether the user has permission to edit this item. Base
860 behaviour is to check whether the user can edit this class. If we're
861 editing the "user" class, users are allowed to edit their own details -
862 unless they try to edit the "roles" property, which requires the
863 special Permission "Web Roles".
864 **new**
865 Determine whether the user has permission to create (or edit) this
866 item. Base behaviour is to check the user can edit this class. No
867 additional property checks are made. Additionally, new user items may
868 be created if the user has the "Web Registration" Permission.
869 **editCSV**
870 Determine whether the user has permission to edit this class. Base
871 behaviour is to check whether the user may edit this class.
872 **search**
873 Determine whether the user has permission to search this class. Base
874 behaviour is to check whether the user may view this class.
877 Special form variables
878 ----------------------
880 Item properties and their values are edited with html FORM
881 variables and their values. You can:
883 - Change the value of some property of the current item.
884 - Create a new item of any class, and edit the new item's
885 properties,
886 - Attach newly created items to a multilink property of the
887 current item.
888 - Remove items from a multilink property of the current item.
889 - Specify that some properties are required for the edit
890 operation to be successful.
892 In the following, <bracketed> values are variable, "@" may be
893 either ":" or "@", and other text "required" is fixed.
895 Most properties are specified as form variables:
897 ``<propname>``
898 property on the current context item
900 ``<designator>"@"<propname>``
901 property on the indicated item (for editing related information)
903 Designators name a specific item of a class.
905 ``<classname><N>``
906 Name an existing item of class <classname>.
908 ``<classname>"-"<N>``
909 Name the <N>th new item of class <classname>. If the form
910 submission is successful, a new item of <classname> is
911 created. Within the submitted form, a particular
912 designator of this form always refers to the same new
913 item.
915 Once we have determined the "propname", we look at it to see
916 if it's special:
918 ``@required``
919 The associated form value is a comma-separated list of
920 property names that must be specified when the form is
921 submitted for the edit operation to succeed.
923 When the <designator> is missing, the properties are
924 for the current context item. When <designator> is
925 present, they are for the item specified by
926 <designator>.
928 The "@required" specifier must come before any of the
929 properties it refers to are assigned in the form.
931 ``@remove@<propname>=id(s)`` or ``@add@<propname>=id(s)``
932 The "@add@" and "@remove@" edit actions apply only to
933 Multilink properties. The form value must be a
934 comma-separate list of keys for the class specified by
935 the simple form variable. The listed items are added
936 to (respectively, removed from) the specified
937 property.
939 ``@link@<propname>=<designator>``
940 If the edit action is "@link@", the simple form
941 variable must specify a Link or Multilink property.
942 The form value is a comma-separated list of
943 designators. The item corresponding to each
944 designator is linked to the property given by simple
945 form variable.
947 None of the above (ie. just a simple form value)
948 The value of the form variable is converted
949 appropriately, depending on the type of the property.
951 For a Link('klass') property, the form value is a
952 single key for 'klass', where the key field is
953 specified in dbinit.py.
955 For a Multilink('klass') property, the form value is a
956 comma-separated list of keys for 'klass', where the
957 key field is specified in dbinit.py.
959 Note that for simple-form-variables specifiying Link
960 and Multilink properties, the linked-to class must
961 have a key field.
963 For a String() property specifying a filename, the
964 file named by the form value is uploaded. This means we
965 try to set additional properties "filename" and "type" (if
966 they are valid for the class). Otherwise, the property
967 is set to the form value.
969 For Date(), Interval(), Boolean(), and Number()
970 properties, the form value is converted to the
971 appropriate
973 Any of the form variables may be prefixed with a classname or
974 designator.
976 Two special form values are supported for backwards compatibility:
978 @note
979 This is equivalent to::
981 @link@messages=msg-1
982 @msg-1@content=value
984 except that in addition, the "author" and "date" properties of
985 "msg-1" are set to the userid of the submitter, and the current
986 time, respectively.
988 @file
989 This is equivalent to::
991 @link@files=file-1
992 @file-1@content=value
994 The String content value is handled as described above for file
995 uploads.
997 If both the "@note" and "@file" form variables are
998 specified, the action::
1000 @link@msg-1@files=file-1
1002 is also performed.
1004 We also check that FileClass items have a "content" property with
1005 actual content, otherwise we remove them from all_props before
1006 returning.
1010 Default templates
1011 -----------------
1013 Most customisation of the web view can be done by modifying the
1014 templates in the tracker ``'html'`` directory. There are several types
1015 of files in there. The *minimal* template includes:
1017 **page.html**
1018 This template usually defines the overall look of your tracker. When
1019 you view an issue, it appears inside this template. When you view an
1020 index, it also appears inside this template. This template defines a
1021 macro called "icing" which is used by almost all other templates as a
1022 coating for their content, using its "content" slot. It also defines
1023 the "head_title" and "body_title" slots to allow setting of the page
1024 title.
1025 **home.html**
1026 the default page displayed when no other page is indicated by the user
1027 **home.classlist.html**
1028 a special version of the default page that lists the classes in the
1029 tracker
1030 **classname.item.html**
1031 displays an item of the *classname* class
1032 **classname.index.html**
1033 displays a list of *classname* items
1034 **classname.search.html**
1035 displays a search page for *classname* items
1036 **_generic.index.html**
1037 used to display a list of items where there is no
1038 ``*classname*.index`` available
1039 **_generic.help.html**
1040 used to display a "class help" page where there is no
1041 ``*classname*.help``
1042 **user.register.html**
1043 a special page just for the user class, that renders the registration
1044 page
1045 **style.css.html**
1046 a static file that is served up as-is
1048 The *classic* template has a number of additional templates.
1050 Note: Remember that you can create any template extension you want to,
1051 so if you just want to play around with the templating for new issues,
1052 you can copy the current "issue.item" template to "issue.test", and then
1053 access the test template using the "@template" URL argument::
1055 http://your.tracker.example/tracker/issue?@template=test
1057 and it won't affect your users using the "issue.item" template.
1060 How the templates work
1061 ----------------------
1064 Basic Templating Actions
1065 ~~~~~~~~~~~~~~~~~~~~~~~~
1067 Roundup's templates consist of special attributes on the HTML tags.
1068 These attributes form the Template Attribute Language, or TAL. The basic
1069 TAL commands are:
1071 **tal:define="variable expression; variable expression; ..."**
1072 Define a new variable that is local to this tag and its contents. For
1073 example::
1075 <html tal:define="title request/description">
1076 <head><title tal:content="title"></title></head>
1077 </html>
1079 In this example, the variable "title" is defined as the result of the
1080 expression "request/description". The "tal:content" command inside the
1081 <html> tag may then use the "title" variable.
1083 **tal:condition="expression"**
1084 Only keep this tag and its contents if the expression is true. For
1085 example::
1087 <p tal:condition="python:request.user.hasPermission('View', 'issue')">
1088 Display some issue information.
1089 </p>
1091 In the example, the <p> tag and its contents are only displayed if
1092 the user has the "View" permission for issues. We consider the number
1093 zero, a blank string, an empty list, and the built-in variable
1094 nothing to be false values. Nearly every other value is true,
1095 including non-zero numbers, and strings with anything in them (even
1096 spaces!).
1098 **tal:repeat="variable expression"**
1099 Repeat this tag and its contents for each element of the sequence
1100 that the expression returns, defining a new local variable and a
1101 special "repeat" variable for each element. For example::
1103 <tr tal:repeat="u user/list">
1104 <td tal:content="u/id"></td>
1105 <td tal:content="u/username"></td>
1106 <td tal:content="u/realname"></td>
1107 </tr>
1109 The example would iterate over the sequence of users returned by
1110 "user/list" and define the local variable "u" for each entry.
1112 **tal:replace="expression"**
1113 Replace this tag with the result of the expression. For example::
1115 <span tal:replace="request/user/realname" />
1117 The example would replace the <span> tag and its contents with the
1118 user's realname. If the user's realname was "Bruce", then the
1119 resultant output would be "Bruce".
1121 **tal:content="expression"**
1122 Replace the contents of this tag with the result of the expression.
1123 For example::
1125 <span tal:content="request/user/realname">user's name appears here
1126 </span>
1128 The example would replace the contents of the <span> tag with the
1129 user's realname. If the user's realname was "Bruce" then the
1130 resultant output would be "<span>Bruce</span>".
1132 **tal:attributes="attribute expression; attribute expression; ..."**
1133 Set attributes on this tag to the results of expressions. For
1134 example::
1136 <a tal:attributes="href string:user${request/user/id}">My Details</a>
1138 In the example, the "href" attribute of the <a> tag is set to the
1139 value of the "string:user${request/user/id}" expression, which will
1140 be something like "user123".
1142 **tal:omit-tag="expression"**
1143 Remove this tag (but not its contents) if the expression is true. For
1144 example::
1146 <span tal:omit-tag="python:1">Hello, world!</span>
1148 would result in output of::
1150 Hello, world!
1152 Note that the commands on a given tag are evaulated in the order above,
1153 so *define* comes before *condition*, and so on.
1155 Additionally, you may include tags such as <tal:block>, which are
1156 removed from output. Its content is kept, but the tag itself is not (so
1157 don't go using any "tal:attributes" commands on it). This is useful for
1158 making arbitrary blocks of HTML conditional or repeatable (very handy
1159 for repeating multiple table rows, which would othewise require an
1160 illegal tag placement to effect the repeat).
1163 Templating Expressions
1164 ~~~~~~~~~~~~~~~~~~~~~~
1166 The expressions you may use in the attribute values may be one of the
1167 following forms:
1169 **Path Expressions** - eg. ``item/status/checklist``
1170 These are object attribute / item accesses. Roughly speaking, the
1171 path ``item/status/checklist`` is broken into parts ``item``,
1172 ``status`` and ``checklist``. The ``item`` part is the root of the
1173 expression. We then look for a ``status`` attribute on ``item``, or
1174 failing that, a ``status`` item (as in ``item['status']``). If that
1175 fails, the path expression fails. When we get to the end, the object
1176 we're left with is evaluated to get a string - if it is a method, it
1177 is called; if it is an object, it is stringified. Path expressions
1178 may have an optional ``path:`` prefix, but they are the default
1179 expression type, so it's not necessary.
1181 If an expression evaluates to ``default``, then the expression is
1182 "cancelled" - whatever HTML already exists in the template will
1183 remain (tag content in the case of ``tal:content``, attributes in the
1184 case of ``tal:attributes``).
1186 If an expression evaluates to ``nothing`` then the target of the
1187 expression is removed (tag content in the case of ``tal:content``,
1188 attributes in the case of ``tal:attributes`` and the tag itself in
1189 the case of ``tal:replace``).
1191 If an element in the path may not exist, then you can use the ``|``
1192 operator in the expression to provide an alternative. So, the
1193 expression ``request/form/foo/value | default`` would simply leave
1194 the current HTML in place if the "foo" form variable doesn't exist.
1196 You may use the python function ``path``, as in
1197 ``path("item/status")``, to embed path expressions in Python
1198 expressions.
1200 **String Expressions** - eg. ``string:hello ${user/name}``
1201 These expressions are simple string interpolations - though they can
1202 be just plain strings with no interpolation if you want. The
1203 expression in the ``${ ... }`` is just a path expression as above.
1205 **Python Expressions** - eg. ``python: 1+1``
1206 These expressions give the full power of Python. All the "root level"
1207 variables are available, so ``python:item.status.checklist()`` would
1208 be equivalent to ``item/status/checklist``, assuming that
1209 ``checklist`` is a method.
1211 Modifiers:
1213 **structure** - eg. ``structure python:msg.content.plain(hyperlink=1)``
1214 The result of expressions are normally *escaped* to be safe for HTML
1215 display (all "<", ">" and "&" are turned into special entities). The
1216 ``structure`` expression modifier turns off this escaping - the
1217 result of the expression is now assumed to be HTML, which is passed
1218 to the web browser for rendering.
1220 **not:** - eg. ``not:python:1=1``
1221 This simply inverts the logical true/false value of another
1222 expression.
1225 Template Macros
1226 ~~~~~~~~~~~~~~~
1228 Macros are used in Roundup to save us from repeating the same common
1229 page stuctures over and over. The most common (and probably only) macro
1230 you'll use is the "icing" macro defined in the "page" template.
1232 Macros are generated and used inside your templates using special
1233 attributes similar to the `basic templating actions`_. In this case,
1234 though, the attributes belong to the Macro Expansion Template Attribute
1235 Language, or METAL. The macro commands are:
1237 **metal:define-macro="macro name"**
1238 Define that the tag and its contents are now a macro that may be
1239 inserted into other templates using the *use-macro* command. For
1240 example::
1242 <html metal:define-macro="page">
1243 ...
1244 </html>
1246 defines a macro called "page" using the ``<html>`` tag and its
1247 contents. Once defined, macros are stored on the template they're
1248 defined on in the ``macros`` attribute. You can access them later on
1249 through the ``templates`` variable, eg. the most common
1250 ``templates/page/macros/icing`` to access the "page" macro of the
1251 "page" template.
1253 **metal:use-macro="path expression"**
1254 Use a macro, which is identified by the path expression (see above).
1255 This will replace the current tag with the identified macro contents.
1256 For example::
1258 <tal:block metal:use-macro="templates/page/macros/icing">
1259 ...
1260 </tal:block>
1262 will replace the tag and its contents with the "page" macro of the
1263 "page" template.
1265 **metal:define-slot="slot name"** and **metal:fill-slot="slot name"**
1266 To define *dynamic* parts of the macro, you define "slots" which may
1267 be filled when the macro is used with a *use-macro* command. For
1268 example, the ``templates/page/macros/icing`` macro defines a slot like
1269 so::
1271 <title metal:define-slot="head_title">title goes here</title>
1273 In your *use-macro* command, you may now use a *fill-slot* command
1274 like this::
1276 <title metal:fill-slot="head_title">My Title</title>
1278 where the tag that fills the slot completely replaces the one defined
1279 as the slot in the macro.
1281 Note that you may not mix METAL and TAL commands on the same tag, but
1282 TAL commands may be used freely inside METAL-using tags (so your
1283 *fill-slots* tags may have all manner of TAL inside them).
1286 Information available to templates
1287 ----------------------------------
1289 Note: this is implemented by
1290 ``roundup.cgi.templating.RoundupPageTemplate``
1292 The following variables are available to templates.
1294 **context**
1295 The current context. This is either None, a `hyperdb class wrapper`_
1296 or a `hyperdb item wrapper`_
1297 **request**
1298 Includes information about the current request, including:
1299 - the current index information (``filterspec``, ``filter`` args,
1300 ``properties``, etc) parsed out of the form.
1301 - methods for easy filterspec link generation
1302 - *user*, the current user item as an HTMLItem instance
1303 - *form*
1304 The current CGI form information as a mapping of form argument name
1305 to value
1306 **config**
1307 This variable holds all the values defined in the tracker config.py
1308 file (eg. TRACKER_NAME, etc.)
1309 **db**
1310 The current database, used to access arbitrary database items.
1311 **templates**
1312 Access to all the tracker templates by name. Used mainly in
1313 *use-macro* commands.
1314 **utils**
1315 This variable makes available some utility functions like batching.
1316 **nothing**
1317 This is a special variable - if an expression evaluates to this, then
1318 the tag (in the case of a ``tal:replace``), its contents (in the case
1319 of ``tal:content``) or some attributes (in the case of
1320 ``tal:attributes``) will not appear in the the output. So, for
1321 example::
1323 <span tal:attributes="class nothing">Hello, World!</span>
1325 would result in::
1327 <span>Hello, World!</span>
1329 **default**
1330 Also a special variable - if an expression evaluates to this, then the
1331 existing HTML in the template will not be replaced or removed, it will
1332 remain. So::
1334 <span tal:replace="default">Hello, World!</span>
1336 would result in::
1338 <span>Hello, World!</span>
1341 The context variable
1342 ~~~~~~~~~~~~~~~~~~~~
1344 The *context* variable is one of three things based on the current
1345 context (see `determining web context`_ for how we figure this out):
1347 1. if we're looking at a "home" page, then it's None
1348 2. if we're looking at a specific hyperdb class, it's a
1349 `hyperdb class wrapper`_.
1350 3. if we're looking at a specific hyperdb item, it's a
1351 `hyperdb item wrapper`_.
1353 If the context is not None, we can access the properties of the class or
1354 item. The only real difference between cases 2 and 3 above are:
1356 1. the properties may have a real value behind them, and this will
1357 appear if the property is displayed through ``context/property`` or
1358 ``context/property/field``.
1359 2. the context's "id" property will be a false value in the second case,
1360 but a real, or true value in the third. Thus we can determine whether
1361 we're looking at a real item from the hyperdb by testing
1362 "context/id".
1364 Hyperdb class wrapper
1365 :::::::::::::::::::::
1367 Note: this is implemented by the ``roundup.cgi.templating.HTMLClass``
1368 class.
1370 This wrapper object provides access to a hyperb class. It is used
1371 primarily in both index view and new item views, but it's also usable
1372 anywhere else that you wish to access information about a class, or the
1373 items of a class, when you don't have a specific item of that class in
1374 mind.
1376 We allow access to properties. There will be no "id" property. The value
1377 accessed through the property will be the current value of the same name
1378 from the CGI form.
1380 There are several methods available on these wrapper objects:
1382 =========== =============================================================
1383 Method Description
1384 =========== =============================================================
1385 properties return a `hyperdb property wrapper`_ for all of this class's
1386 properties.
1387 list lists all of the active (not retired) items in the class.
1388 csv return the items of this class as a chunk of CSV text.
1389 propnames lists the names of the properties of this class.
1390 filter lists of items from this class, filtered and sorted by the
1391 current *request* filterspec/filter/sort/group args
1392 classhelp display a link to a javascript popup containing this class'
1393 "help" template.
1394 submit generate a submit button (and action hidden element)
1395 renderWith render this class with the given template.
1396 history returns 'New node - no history' :)
1397 is_edit_ok is the user allowed to Edit the current class?
1398 is_view_ok is the user allowed to View the current class?
1399 =========== =============================================================
1401 Note that if you have a property of the same name as one of the above
1402 methods, you'll need to access it using a python "item access"
1403 expression. For example::
1405 python:context['list']
1407 will access the "list" property, rather than the list method.
1410 Hyperdb item wrapper
1411 ::::::::::::::::::::
1413 Note: this is implemented by the ``roundup.cgi.templating.HTMLItem``
1414 class.
1416 This wrapper object provides access to a hyperb item.
1418 We allow access to properties. There will be no "id" property. The value
1419 accessed through the property will be the current value of the same name
1420 from the CGI form.
1422 There are several methods available on these wrapper objects:
1424 =============== ========================================================
1425 Method Description
1426 =============== ========================================================
1427 submit generate a submit button (and action hidden element)
1428 journal return the journal of the current item (**not
1429 implemented**)
1430 history render the journal of the current item as HTML
1431 renderQueryForm specific to the "query" class - render the search form
1432 for the query
1433 hasPermission specific to the "user" class - determine whether the
1434 user has a Permission
1435 is_edit_ok is the user allowed to Edit the current item?
1436 is_view_ok is the user allowed to View the current item?
1437 =============== ========================================================
1439 Note that if you have a property of the same name as one of the above
1440 methods, you'll need to access it using a python "item access"
1441 expression. For example::
1443 python:context['journal']
1445 will access the "journal" property, rather than the journal method.
1448 Hyperdb property wrapper
1449 ::::::::::::::::::::::::
1451 Note: this is implemented by subclasses of the
1452 ``roundup.cgi.templating.HTMLProperty`` class (``HTMLStringProperty``,
1453 ``HTMLNumberProperty``, and so on).
1455 This wrapper object provides access to a single property of a class. Its
1456 value may be either:
1458 1. if accessed through a `hyperdb item wrapper`_, then it's a value from
1459 the hyperdb
1460 2. if access through a `hyperdb class wrapper`_, then it's a value from
1461 the CGI form
1464 The property wrapper has some useful attributes:
1466 =============== ========================================================
1467 Attribute Description
1468 =============== ========================================================
1469 _name the name of the property
1470 _value the value of the property if any - this is the actual
1471 value retrieved from the hyperdb for this property
1472 =============== ========================================================
1474 There are several methods available on these wrapper objects:
1476 ========= ================================================================
1477 Method Description
1478 ========= ================================================================
1479 plain render a "plain" representation of the property. This method
1480 may take two arguments:
1482 escape
1483 If true, escape the text so it is HTML safe (default: no). The
1484 reason this defaults to off is that text is usually escaped
1485 at a later stage by the TAL commands, unless the "structure"
1486 option is used in the template. The following ``tal:content``
1487 expressions are all equivalent::
1489 "structure python:msg.content.plain(escape=1)"
1490 "python:msg.content.plain()"
1491 "msg/content/plain"
1492 "msg/content"
1494 Usually you'll only want to use the escape option in a
1495 complex expression.
1497 hyperlink
1498 If true, turn URLs, email addresses and hyperdb item
1499 designators in the text into hyperlinks (default: no). Note
1500 that you'll need to use the "structure" TAL option if you
1501 want to use this ``tal:content`` expression::
1503 "structure python:msg.content.plain(hyperlink=1)"
1505 Note also that the text is automatically HTML-escaped before
1506 the hyperlinking transformation.
1508 field render an appropriate form edit field for the property - for
1509 most types this is a text entry box, but for Booleans it's a
1510 tri-state yes/no/neither selection.
1511 stext only on String properties - render the value of the property
1512 as StructuredText (requires the StructureText module to be
1513 installed separately)
1514 multiline only on String properties - render a multiline form edit
1515 field for the property
1516 email only on String properties - render the value of the property
1517 as an obscured email address
1518 confirm only on Password properties - render a second form edit field
1519 for the property, used for confirmation that the user typed
1520 the password correctly. Generates a field with name
1521 "name:confirm".
1522 now only on Date properties - return the current date as a new
1523 property
1524 reldate only on Date properties - render the interval between the date
1525 and now
1526 local only on Date properties - return this date as a new property
1527 with some timezone offset
1528 pretty only on Interval properties - render the interval in a pretty
1529 format (eg. "yesterday")
1530 menu only on Link and Multilink properties - render a form select
1531 list for this property
1532 reverse only on Multilink properties - produce a list of the linked
1533 items in reverse order
1534 ========= ================================================================
1537 The request variable
1538 ~~~~~~~~~~~~~~~~~~~~
1540 Note: this is implemented by the ``roundup.cgi.templating.HTMLRequest``
1541 class.
1543 The request variable is packed with information about the current
1544 request.
1546 .. taken from ``roundup.cgi.templating.HTMLRequest`` docstring
1548 =========== ============================================================
1549 Variable Holds
1550 =========== ============================================================
1551 form the CGI form as a cgi.FieldStorage
1552 env the CGI environment variables
1553 base the base URL for this tracker
1554 user a HTMLUser instance for this user
1555 classname the current classname (possibly None)
1556 template the current template (suffix, also possibly None)
1557 form the current CGI form variables in a FieldStorage
1558 =========== ============================================================
1560 **Index page specific variables (indexing arguments)**
1562 =========== ============================================================
1563 Variable Holds
1564 =========== ============================================================
1565 columns dictionary of the columns to display in an index page
1566 show a convenience access to columns - request/show/colname will
1567 be true if the columns should be displayed, false otherwise
1568 sort index sort column (direction, column name)
1569 group index grouping property (direction, column name)
1570 filter properties to filter the index on
1571 filterspec values to filter the index on
1572 search_text text to perform a full-text search on for an index
1573 =========== ============================================================
1575 There are several methods available on the request variable:
1577 =============== ========================================================
1578 Method Description
1579 =============== ========================================================
1580 description render a description of the request - handle for the
1581 page title
1582 indexargs_form render the current index args as form elements
1583 indexargs_url render the current index args as a URL
1584 base_javascript render some javascript that is used by other components
1585 of the templating
1586 batch run the current index args through a filter and return a
1587 list of items (see `hyperdb item wrapper`_, and
1588 `batching`_)
1589 =============== ========================================================
1591 The form variable
1592 :::::::::::::::::
1594 The form variable is a bit special because it's actually a python
1595 FieldStorage object. That means that you have two ways to access its
1596 contents. For example, to look up the CGI form value for the variable
1597 "name", use the path expression::
1599 request/form/name/value
1601 or the python expression::
1603 python:request.form['name'].value
1605 Note the "item" access used in the python case, and also note the
1606 explicit "value" attribute we have to access. That's because the form
1607 variables are stored as MiniFieldStorages. If there's more than one
1608 "name" value in the form, then the above will break since
1609 ``request/form/name`` is actually a *list* of MiniFieldStorages. So it's
1610 best to know beforehand what you're dealing with.
1613 The db variable
1614 ~~~~~~~~~~~~~~~
1616 Note: this is implemented by the ``roundup.cgi.templating.HTMLDatabase``
1617 class.
1619 Allows access to all hyperdb classes as attributes of this variable. If
1620 you want access to the "user" class, for example, you would use::
1622 db/user
1623 python:db.user
1625 Also, the current id of the current user is available as
1626 ``db.curuserid``. This isn't so useful in templates (where you have
1627 ``request/user``), but it can be useful in detectors or interfaces.
1629 The access results in a `hyperdb class wrapper`_.
1632 The templates variable
1633 ~~~~~~~~~~~~~~~~~~~~~~
1635 Note: this is implemented by the ``roundup.cgi.templating.Templates``
1636 class.
1638 This variable doesn't have any useful methods defined. It supports being
1639 used in expressions to access the templates, and consequently the
1640 template macros. You may access the templates using the following path
1641 expression::
1643 templates/name
1645 or the python expression::
1647 templates[name]
1649 where "name" is the name of the template you wish to access. The
1650 template has one useful attribute, namely "macros". To access a specific
1651 macro (called "macro_name"), use the path expression::
1653 templates/name/macros/macro_name
1655 or the python expression::
1657 templates[name].macros[macro_name]
1660 The utils variable
1661 ~~~~~~~~~~~~~~~~~~
1663 Note: this is implemented by the
1664 ``roundup.cgi.templating.TemplatingUtils`` class, but it may be extended
1665 as described below.
1667 =============== ========================================================
1668 Method Description
1669 =============== ========================================================
1670 Batch return a batch object using the supplied list
1671 =============== ========================================================
1673 You may add additional utility methods by writing them in your tracker
1674 ``interfaces.py`` module's ``TemplatingUtils`` class. See `adding a time
1675 log to your issues`_ for an example. The TemplatingUtils class itself
1676 will have a single attribute, ``client``, which may be used to access
1677 the ``client.db`` when you need to perform arbitrary database queries.
1679 Batching
1680 ::::::::
1682 Use Batch to turn a list of items, or item ids of a given class, into a
1683 series of batches. Its usage is::
1685 python:utils.Batch(sequence, size, start, end=0, orphan=0,
1686 overlap=0)
1688 or, to get the current index batch::
1690 request/batch
1692 The parameters are:
1694 ========= ==============================================================
1695 Parameter Usage
1696 ========= ==============================================================
1697 sequence a list of HTMLItems
1698 size how big to make the sequence.
1699 start where to start (0-indexed) in the sequence.
1700 end where to end (0-indexed) in the sequence.
1701 orphan if the next batch would contain less items than this value,
1702 then it is combined with this batch
1703 overlap the number of items shared between adjacent batches
1704 ========= ==============================================================
1706 All of the parameters are assigned as attributes on the batch object. In
1707 addition, it has several more attributes:
1709 =============== ========================================================
1710 Attribute Description
1711 =============== ========================================================
1712 start indicates the start index of the batch. *Note: unlike
1713 the argument, is a 1-based index (I know, lame)*
1714 first indicates the start index of the batch *as a 0-based
1715 index*
1716 length the actual number of elements in the batch
1717 sequence_length the length of the original, unbatched, sequence.
1718 =============== ========================================================
1720 And several methods:
1722 =============== ========================================================
1723 Method Description
1724 =============== ========================================================
1725 previous returns a new Batch with the previous batch settings
1726 next returns a new Batch with the next batch settings
1727 propchanged detect if the named property changed on the current item
1728 when compared to the last item
1729 =============== ========================================================
1731 An example of batching::
1733 <table class="otherinfo">
1734 <tr><th colspan="4" class="header">Existing Keywords</th></tr>
1735 <tr tal:define="keywords db/keyword/list"
1736 tal:repeat="start python:range(0, len(keywords), 4)">
1737 <td tal:define="batch python:utils.Batch(keywords, 4, start)"
1738 tal:repeat="keyword batch" tal:content="keyword/name">
1739 keyword here</td>
1740 </tr>
1741 </table>
1743 ... which will produce a table with four columns containing the items of
1744 the "keyword" class (well, their "name" anyway).
1746 Displaying Properties
1747 ---------------------
1749 Properties appear in the user interface in three contexts: in indices,
1750 in editors, and as search arguments. For each type of property, there
1751 are several display possibilities. For example, in an index view, a
1752 string property may just be printed as a plain string, but in an editor
1753 view, that property may be displayed in an editable field.
1756 Index Views
1757 -----------
1759 This is one of the class context views. It is also the default view for
1760 classes. The template used is "*classname*.index".
1763 Index View Specifiers
1764 ~~~~~~~~~~~~~~~~~~~~~
1766 An index view specifier (URL fragment) looks like this (whitespace has
1767 been added for clarity)::
1769 /issue?status=unread,in-progress,resolved&
1770 topic=security,ui&
1771 :group=+priority&
1772 :sort==activity&
1773 :filters=status,topic&
1774 :columns=title,status,fixer
1776 The index view is determined by two parts of the specifier: the layout
1777 part and the filter part. The layout part consists of the query
1778 parameters that begin with colons, and it determines the way that the
1779 properties of selected items are displayed. The filter part consists of
1780 all the other query parameters, and it determines the criteria by which
1781 items are selected for display. The filter part is interactively
1782 manipulated with the form widgets displayed in the filter section. The
1783 layout part is interactively manipulated by clicking on the column
1784 headings in the table.
1786 The filter part selects the union of the sets of items with values
1787 matching any specified Link properties and the intersection of the sets
1788 of items with values matching any specified Multilink properties.
1790 The example specifies an index of "issue" items. Only items with a
1791 "status" of either "unread" or "in-progress" or "resolved" are
1792 displayed, and only items with "topic" values including both "security"
1793 and "ui" are displayed. The items are grouped by priority, arranged in
1794 ascending order; and within groups, sorted by activity, arranged in
1795 descending order. The filter section shows filters for the "status" and
1796 "topic" properties, and the table includes columns for the "title",
1797 "status", and "fixer" properties.
1799 Searching Views
1800 ---------------
1802 Note: if you add a new column to the ``:columns`` form variable
1803 potentials then you will need to add the column to the appropriate
1804 `index views`_ template so that it is actually displayed.
1806 This is one of the class context views. The template used is typically
1807 "*classname*.search". The form on this page should have "search" as its
1808 ``@action`` variable. The "search" action:
1810 - sets up additional filtering, as well as performing indexed text
1811 searching
1812 - sets the ``:filter`` variable correctly
1813 - saves the query off if ``:query_name`` is set.
1815 The search page should lay out any fields that you wish to allow the
1816 user to search on. If your schema contains a large number of properties,
1817 you should be wary of making all of those properties available for
1818 searching, as this can cause confusion. If the additional properties are
1819 Strings, consider having their value indexed, and then they will be
1820 searchable using the full text indexed search. This is both faster, and
1821 more useful for the end user.
1823 The two special form values on search pages which are handled by the
1824 "search" action are:
1826 :search_text
1827 Text with which to perform a search of the text index. Results from
1828 that search will be used to limit the results of other filters (using
1829 an intersection operation)
1830 :query_name
1831 If supplied, the search parameters (including :search_text) will be
1832 saved off as a the query item and registered against the user's
1833 queries property. Note that the *classic* template schema has this
1834 ability, but the *minimal* template schema does not.
1837 Item Views
1838 ----------
1840 The basic view of a hyperdb item is provided by the "*classname*.item"
1841 template. It generally has three sections; an "editor", a "spool" and a
1842 "history" section.
1845 Editor Section
1846 ~~~~~~~~~~~~~~
1848 The editor section is used to manipulate the item - it may be a static
1849 display if the user doesn't have permission to edit the item.
1851 Here's an example of a basic editor template (this is the default
1852 "classic" template issue item edit form - from the "issue.item.html"
1853 template)::
1855 <table class="form">
1856 <tr>
1857 <th nowrap>Title</th>
1858 <td colspan="3" tal:content="structure python:context.title.field(size=60)">title</td>
1859 </tr>
1861 <tr>
1862 <th nowrap>Priority</th>
1863 <td tal:content="structure context/priority/menu">priority</td>
1864 <th nowrap>Status</th>
1865 <td tal:content="structure context/status/menu">status</td>
1866 </tr>
1868 <tr>
1869 <th nowrap>Superseder</th>
1870 <td>
1871 <span tal:replace="structure python:context.superseder.field(showid=1, size=20)" />
1872 <span tal:replace="structure python:db.issue.classhelp('id,title')" />
1873 <span tal:condition="context/superseder">
1874 <br>View: <span tal:replace="structure python:context.superseder.link(showid=1)" />
1875 </span>
1876 </td>
1877 <th nowrap>Nosy List</th>
1878 <td>
1879 <span tal:replace="structure context/nosy/field" />
1880 <span tal:replace="structure python:db.user.classhelp('username,realname,address,phone')" />
1881 </td>
1882 </tr>
1884 <tr>
1885 <th nowrap>Assigned To</th>
1886 <td tal:content="structure context/assignedto/menu">
1887 assignedto menu
1888 </td>
1889 <td> </td>
1890 <td> </td>
1891 </tr>
1893 <tr>
1894 <th nowrap>Change Note</th>
1895 <td colspan="3">
1896 <textarea name=":note" wrap="hard" rows="5" cols="60"></textarea>
1897 </td>
1898 </tr>
1900 <tr>
1901 <th nowrap>File</th>
1902 <td colspan="3"><input type="file" name=":file" size="40"></td>
1903 </tr>
1905 <tr>
1906 <td> </td>
1907 <td colspan="3" tal:content="structure context/submit">
1908 submit button will go here
1909 </td>
1910 </tr>
1911 </table>
1914 When a change is submitted, the system automatically generates a message
1915 describing the changed properties. As shown in the example, the editor
1916 template can use the ":note" and ":file" fields, which are added to the
1917 standard changenote message generated by Roundup.
1920 Form values
1921 :::::::::::
1923 We have a number of ways to pull properties out of the form in order to
1924 meet the various needs of:
1926 1. editing the current item (perhaps an issue item)
1927 2. editing information related to the current item (eg. messages or
1928 attached files)
1929 3. creating new information to be linked to the current item (eg. time
1930 spent on an issue)
1932 In the following, ``<bracketed>`` values are variable, ":" may be one of
1933 ":" or "@", and other text ("required") is fixed.
1935 Properties are specified as form variables:
1937 ``<propname>``
1938 property on the current context item
1940 ``<designator>:<propname>``
1941 property on the indicated item (for editing related information)
1943 ``<classname>-<N>:<propname>``
1944 property on the Nth new item of classname (generally for creating new
1945 items to attach to the current item)
1947 Once we have determined the "propname", we check to see if it is one of
1948 the special form values:
1950 ``@required``
1951 The named property values must be supplied or a ValueError will be
1952 raised.
1954 ``@remove@<propname>=id(s)``
1955 The ids will be removed from the multilink property.
1957 ``:add:<propname>=id(s)``
1958 The ids will be added to the multilink property.
1960 ``:link:<propname>=<designator>``
1961 Used to add a link to new items created during edit. These are
1962 collected and returned in ``all_links``. This will result in an
1963 additional linking operation (either Link set or Multilink append)
1964 after the edit/create is done using ``all_props`` in ``_editnodes``.
1965 The <propname> on the current item will be set/appended the id of the
1966 newly created item of class <designator> (where <designator> must be
1967 <classname>-<N>).
1969 Any of the form variables may be prefixed with a classname or
1970 designator.
1972 Two special form values are supported for backwards compatibility:
1974 ``:note``
1975 create a message (with content, author and date), linked to the
1976 context item. This is ALWAYS designated "msg-1".
1977 ``:file``
1978 create a file, attached to the current item and any message created by
1979 :note. This is ALWAYS designated "file-1".
1982 Spool Section
1983 ~~~~~~~~~~~~~
1985 The spool section lists related information like the messages and files
1986 of an issue.
1988 TODO
1991 History Section
1992 ~~~~~~~~~~~~~~~
1994 The final section displayed is the history of the item - its database
1995 journal. This is generally generated with the template::
1997 <tal:block tal:replace="structure context/history" />
1999 *To be done:*
2001 *The actual history entries of the item may be accessed for manual
2002 templating through the "journal" method of the item*::
2004 <tal:block tal:repeat="entry context/journal">
2005 a journal entry
2006 </tal:block>
2008 *where each journal entry is an HTMLJournalEntry.*
2010 Defining new web actions
2011 ------------------------
2013 You may define new actions to be triggered by the ``@action`` form
2014 variable. These are added to the tracker ``interfaces.py`` as methods on
2015 the ``Client`` class.
2017 Adding action methods takes three steps; first you `define the new
2018 action method`_, then you `register the action method`_ with the cgi
2019 interface so it may be triggered by the ``@action`` form variable.
2020 Finally you `use the new action`_ in your HTML form.
2022 See "`setting up a "wizard" (or "druid") for controlled adding of
2023 issues`_" for an example.
2026 Define the new action method
2027 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2029 The action methods have the following interface::
2031 def myActionMethod(self):
2032 ''' Perform some action. No return value is required.
2033 '''
2035 The *self* argument is an instance of your tracker ``instance.Client``
2036 class - thus it's mostly implemented by ``roundup.cgi.Client``. See the
2037 docstring of that class for details of what it can do.
2039 The method will typically check the ``self.form`` variable's contents.
2040 It may then:
2042 - add information to ``self.ok_message`` or ``self.error_message``
2043 - change the ``self.template`` variable to alter what the user will see
2044 next
2045 - raise Unauthorised, SendStaticFile, SendFile, NotFound or Redirect
2046 exceptions
2049 Register the action method
2050 ~~~~~~~~~~~~~~~~~~~~~~~~~~
2052 The method is now written, but isn't available to the user until you add
2053 it to the `instance.Client`` class ``actions`` variable, like so::
2055 actions = client.Class.actions + (
2056 ('myaction', 'myActionMethod'),
2057 )
2059 This maps the action name "myaction" to the action method we defined.
2062 Use the new action
2063 ~~~~~~~~~~~~~~~~~~
2065 In your HTML form, add a hidden form element like so::
2067 <input type="hidden" name="@action" value="myaction">
2069 where "myaction" is the name you registered in the previous step.
2072 Examples
2073 ========
2075 .. contents::
2076 :local:
2077 :depth: 1
2080 Adding a new field to the classic schema
2081 ----------------------------------------
2083 This example shows how to add a new constrained property (i.e. a
2084 selection of distinct values) to your tracker.
2087 Introduction
2088 ~~~~~~~~~~~~
2090 To make the classic schema of roundup useful as a TODO tracking system
2091 for a group of systems administrators, it needed an extra data field per
2092 issue: a category.
2094 This would let sysadmins quickly list all TODOs in their particular area
2095 of interest without having to do complex queries, and without relying on
2096 the spelling capabilities of other sysadmins (a losing proposition at
2097 best).
2100 Adding a field to the database
2101 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2103 This is the easiest part of the change. The category would just be a
2104 plain string, nothing fancy. To change what is in the database you need
2105 to add some lines to the ``open()`` function in ``dbinit.py``. Under the
2106 comment::
2108 # add any additional database schema configuration here
2110 add::
2112 category = Class(db, "category", name=String())
2113 category.setkey("name")
2115 Here we are setting up a chunk of the database which we are calling
2116 "category". It contains a string, which we are refering to as "name" for
2117 lack of a more imaginative title. (Since "name" is one of the properties
2118 that Roundup looks for on items if you do not set a key for them, it's
2119 probably a good idea to stick with it for new classes if at all
2120 appropriate.) Then we are setting the key of this chunk of the database
2121 to be that "name". This is equivalent to an index for database types.
2122 This also means that there can only be one category with a given name.
2124 Adding the above lines allows us to create categories, but they're not
2125 tied to the issues that we are going to be creating. It's just a list of
2126 categories off on its own, which isn't much use. We need to link it in
2127 with the issues. To do that, find the lines in the ``open()`` function
2128 in ``dbinit.py`` which set up the "issue" class, and then add a link to
2129 the category::
2131 issue = IssueClass(db, "issue", ... ,
2132 category=Multilink("category"), ... )
2134 The ``Multilink()`` means that each issue can have many categories. If
2135 you were adding something with a one-to-one relationship to issues (such
2136 as the "assignedto" property), use ``Link()`` instead.
2138 That is all you need to do to change the schema. The rest of the effort
2139 is fiddling around so you can actually use the new category.
2142 Populating the new category class
2143 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2145 If you haven't initialised the database with the roundup-admin
2146 "initialise" command, then you can add the following to the tracker
2147 ``dbinit.py`` in the ``init()`` function under the comment::
2149 # add any additional database create steps here - but only if you
2150 # haven't initialised the database with the admin "initialise" command
2152 Add::
2154 category = db.getclass('category')
2155 category.create(name="scipy", order="1")
2156 category.create(name="chaco", order="2")
2157 category.create(name="weave", order="3")
2159 If the database has already been initalised, then you need to use the
2160 ``roundup-admin`` tool::
2162 % roundup-admin -i <tracker home>
2163 Roundup <version> ready for input.
2164 Type "help" for help.
2165 roundup> create category name=scipy order=1
2166 1
2167 roundup> create category name=chaco order=1
2168 2
2169 roundup> create category name=weave order=1
2170 3
2171 roundup> exit...
2172 There are unsaved changes. Commit them (y/N)? y
2174 TODO: explain why order=1 in each case. Also, does key get set to "name"
2175 automatically when added via roundup-admin?
2178 Setting up security on the new objects
2179 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2181 By default only the admin user can look at and change objects. This
2182 doesn't suit us, as we want any user to be able to create new categories
2183 as required, and obviously everyone needs to be able to view the
2184 categories of issues for it to be useful.
2186 We therefore need to change the security of the category objects. This
2187 is also done in the ``open()`` function of ``dbinit.py``.
2189 There are currently two loops which set up permissions and then assign
2190 them to various roles. Simply add the new "category" to both lists::
2192 # new permissions for this schema
2193 for cl in 'issue', 'file', 'msg', 'user', 'category':
2194 db.security.addPermission(name="Edit", klass=cl,
2195 description="User is allowed to edit "+cl)
2196 db.security.addPermission(name="View", klass=cl,
2197 description="User is allowed to access "+cl)
2199 # Assign the access and edit permissions for issue, file and message
2200 # to regular users now
2201 for cl in 'issue', 'file', 'msg', 'category':
2202 p = db.security.getPermission('View', cl)
2203 db.security.addPermissionToRole('User', p)
2204 p = db.security.getPermission('Edit', cl)
2205 db.security.addPermissionToRole('User', p)
2207 So you are in effect doing the following (with 'cl' substituted by its
2208 value)::
2210 db.security.addPermission(name="Edit", klass='category',
2211 description="User is allowed to edit "+'category')
2212 db.security.addPermission(name="View", klass='category',
2213 description="User is allowed to access "+'category')
2215 which is creating two permission types; that of editing and viewing
2216 "category" objects respectively. Then the following lines assign those
2217 new permissions to the "User" role, so that normal users can view and
2218 edit "category" objects::
2220 p = db.security.getPermission('View', 'category')
2221 db.security.addPermissionToRole('User', p)
2223 p = db.security.getPermission('Edit', 'category')
2224 db.security.addPermissionToRole('User', p)
2226 This is all the work that needs to be done for the database. It will
2227 store categories, and let users view and edit them. Now on to the
2228 interface stuff.
2231 Changing the web left hand frame
2232 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2234 We need to give the users the ability to create new categories, and the
2235 place to put the link to this functionality is in the left hand function
2236 bar, under the "Issues" area. The file that defines how this area looks
2237 is ``html/page``, which is what we are going to be editing next.
2239 If you look at this file you can see that it contains a lot of
2240 "classblock" sections which are chunks of HTML that will be included or
2241 excluded in the output depending on whether the condition in the
2242 classblock is met. Under the end of the classblock for issue is where we
2243 are going to add the category code::
2245 <p class="classblock"
2246 tal:condition="python:request.user.hasPermission('View', 'category')">
2247 <b>Categories</b><br>
2248 <a tal:condition="python:request.user.hasPermission('Edit', 'category')"
2249 href="category?@template=item">New Category<br></a>
2250 </p>
2252 The first two lines is the classblock definition, which sets up a
2253 condition that only users who have "View" permission for the "category"
2254 object will have this section included in their output. Next comes a
2255 plain "Categories" header in bold. Everyone who can view categories will
2256 get that.
2258 Next comes the link to the editing area of categories. This link will
2259 only appear if the condition - that the user has "Edit" permissions for
2260 the "category" objects - is matched. If they do have permission then
2261 they will get a link to another page which will let the user add new
2262 categories.
2264 Note that if you have permission to *view* but not to *edit* categories,
2265 then all you will see is a "Categories" header with nothing underneath
2266 it. This is obviously not very good interface design, but will do for
2267 now. I just claim that it is so I can add more links in this section
2268 later on. However to fix the problem you could change the condition in
2269 the classblock statement, so that only users with "Edit" permission
2270 would see the "Categories" stuff.
2273 Setting up a page to edit categories
2274 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2276 We defined code in the previous section which let users with the
2277 appropriate permissions see a link to a page which would let them edit
2278 conditions. Now we have to write that page.
2280 The link was for the *item* template of the *category* object. This
2281 translates into Roundup looking for a file called ``category.item.html``
2282 in the ``html`` tracker directory. This is the file that we are going to
2283 write now.
2285 First we add an info tag in a comment which doesn't affect the outcome
2286 of the code at all, but is useful for debugging. If you load a page in a
2287 browser and look at the page source, you can see which sections come
2288 from which files by looking for these comments::
2290 <!-- category.item -->
2292 Next we need to add in the METAL macro stuff so we get the normal page
2293 trappings::
2295 <tal:block metal:use-macro="templates/page/macros/icing">
2296 <title metal:fill-slot="head_title">Category editing</title>
2297 <td class="page-header-top" metal:fill-slot="body_title">
2298 <h2>Category editing</h2>
2299 </td>
2300 <td class="content" metal:fill-slot="content">
2302 Next we need to setup up a standard HTML form, which is the whole
2303 purpose of this file. We link to some handy javascript which sends the
2304 form through only once. This is to stop users hitting the send button
2305 multiple times when they are impatient and thus having the form sent
2306 multiple times::
2308 <form method="POST" onSubmit="return submit_once()"
2309 enctype="multipart/form-data">
2311 Next we define some code which sets up the minimum list of fields that
2312 we require the user to enter. There will be only one field - "name" - so
2313 they better put something in it, otherwise the whole form is pointless::
2315 <input type="hidden" name="@required" value="name">
2317 To get everything to line up properly we will put everything in a table,
2318 and put a nice big header on it so the user has an idea what is
2319 happening::
2321 <table class="form">
2322 <tr><th class="header" colspan="2">Category</th></tr>
2324 Next, we need the field into which the user is going to enter the new
2325 category. The "context.name.field(size=60)" bit tells Roundup to
2326 generate a normal HTML field of size 60, and the contents of that field
2327 will be the "name" variable of the current context (which is
2328 "category"). The upshot of this is that when the user types something in
2329 to the form, a new category will be created with that name::
2331 <tr>
2332 <th nowrap>Name</th>
2333 <td tal:content="structure python:context.name.field(size=60)">
2334 name</td>
2335 </tr>
2337 Then a submit button so that the user can submit the new category::
2339 <tr>
2340 <td> </td>
2341 <td colspan="3" tal:content="structure context/submit">
2342 submit button will go here
2343 </td>
2344 </tr>
2346 Finally we finish off the tags we used at the start to do the METAL
2347 stuff::
2349 </td>
2350 </tal:block>
2352 So putting it all together, and closing the table and form we get::
2354 <!-- category.item -->
2355 <tal:block metal:use-macro="templates/page/macros/icing">
2356 <title metal:fill-slot="head_title">Category editing</title>
2357 <td class="page-header-top" metal:fill-slot="body_title">
2358 <h2>Category editing</h2>
2359 </td>
2360 <td class="content" metal:fill-slot="content">
2361 <form method="POST" onSubmit="return submit_once()"
2362 enctype="multipart/form-data">
2364 <input type="hidden" name="@required" value="name">
2366 <table class="form">
2367 <tr><th class="header" colspan="2">Category</th></tr>
2369 <tr>
2370 <th nowrap>Name</th>
2371 <td tal:content="structure python:context.name.field(size=60)">
2372 name</td>
2373 </tr>
2375 <tr>
2376 <td> </td>
2377 <td colspan="3" tal:content="structure context/submit">
2378 submit button will go here
2379 </td>
2380 </tr>
2381 </table>
2382 </form>
2383 </td>
2384 </tal:block>
2386 This is quite a lot to just ask the user one simple question, but there
2387 is a lot of setup for basically one line (the form line) to do its work.
2388 To add another field to "category" would involve one more line (well,
2389 maybe a few extra to get the formatting correct).
2392 Adding the category to the issue
2393 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2395 We now have the ability to create issues to our heart's content, but
2396 that is pointless unless we can assign categories to issues. Just like
2397 the ``html/category.item.html`` file was used to define how to add a new
2398 category, the ``html/issue.item.html`` is used to define how a new issue
2399 is created.
2401 Just like ``category.issue.html`` this file defines a form which has a
2402 table to lay things out. It doesn't matter where in the table we add new
2403 stuff, it is entirely up to your sense of aesthetics::
2405 <th nowrap>Category</th>
2406 <td><span tal:replace="structure context/category/field" />
2407 <span tal:replace="structure db/category/classhelp" />
2408 </td>
2410 First, we define a nice header so that the user knows what the next
2411 section is, then the middle line does what we are most interested in.
2412 This ``context/category/field`` gets replaced by a field which contains
2413 the category in the current context (the current context being the new
2414 issue).
2416 The classhelp lines generate a link (labelled "list") to a popup window
2417 which contains the list of currently known categories.
2420 Searching on categories
2421 ~~~~~~~~~~~~~~~~~~~~~~~
2423 We can add categories, and create issues with categories. The next
2424 obvious thing that we would like to be able to do, would be to search
2425 for issues based on their category, so that, for example, anyone working
2426 on the web server could look at all issues in the category "Web".
2428 If you look for "Search Issues" in the 'html/page.html' file, you will
2429 find that it looks something like
2430 ``<a href="issue?@template=search">Search Issues</a>``. This shows us
2431 that when you click on "Search Issues" it will be looking for a
2432 ``issue.search.html`` file to display. So that is the file that we will
2433 change.
2435 If you look at this file it should be starting to seem familiar, although it
2436 does use some new macros. You can add the new category search code anywhere you
2437 like within that form::
2439 <tr tal:define="name string:category;
2440 db_klass string:category;
2441 db_content string:name;">
2442 <th>Priority:</th>
2443 <td metal:use-macro="search_select"></td>
2444 <td metal:use-macro="column_input"></td>
2445 <td metal:use-macro="sort_input"></td>
2446 <td metal:use-macro="group_input"></td>
2447 </tr>
2449 The definitions in the <tr> opening tag are used by the macros:
2451 - search_select expands to a drop-down box with all categories using db_klass
2452 and db_content.
2453 - column_input expands to a checkbox for selecting what columns should be
2454 displayed.
2455 - sort_input expands to a radio button for selecting what property should be
2456 sorted on.
2457 - group_input expands to a radio button for selecting what property should be
2458 group on.
2460 The category search code above would expand to the following::
2462 <tr>
2463 <th>Category:</th>
2464 <td>
2465 <select name="category">
2466 <option value="">don't care</option>
2467 <option value="">------------</option>
2468 <option value="1">scipy</option>
2469 <option value="2">chaco</option>
2470 <option value="3">weave</option>
2471 </select>
2472 </td>
2473 <td><input type="checkbox" name=":columns" value="category"></td>
2474 <td><input type="radio" name=":sort" value="category"></td>
2475 <td><input type="radio" name=":group" value="category"></td>
2476 </tr>
2478 Adding category to the default view
2479 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2481 We can now add categories, add issues with categories, and search for
2482 issues based on categories. This is everything that we need to do;
2483 however, there is some more icing that we would like. I think the
2484 category of an issue is important enough that it should be displayed by
2485 default when listing all the issues.
2487 Unfortunately, this is a bit less obvious than the previous steps. The
2488 code defining how the issues look is in ``html/issue.index.html``. This
2489 is a large table with a form down at the bottom for redisplaying and so
2490 forth.
2492 Firstly we need to add an appropriate header to the start of the table::
2494 <th tal:condition="request/show/category">Category</th>
2496 The *condition* part of this statement is to avoid displaying the
2497 Category column if the user has selected not to see it.
2499 The rest of the table is a loop which will go through every issue that
2500 matches the display criteria. The loop variable is "i" - which means
2501 that every issue gets assigned to "i" in turn.
2503 The new part of code to display the category will look like this::
2505 <td tal:condition="request/show/category"
2506 tal:content="i/category"></td>
2508 The condition is the same as above: only display the condition when the
2509 user hasn't asked for it to be hidden. The next part is to set the
2510 content of the cell to be the category part of "i" - the current issue.
2512 Finally we have to edit ``html/page.html`` again. This time, we need to
2513 tell it that when the user clicks on "Unasigned Issues" or "All Issues",
2514 the category column should be included in the resulting list. If you
2515 scroll down the page file, you can see the links with lots of options.
2516 The option that we are interested in is the ``:columns=`` one which
2517 tells roundup which fields of the issue to display. Simply add
2518 "category" to that list and it all should work.
2521 Adding in state transition control
2522 ----------------------------------
2524 Sometimes tracker admins want to control the states that users may move
2525 issues to. You can do this by following these steps:
2527 1. make "status" a required variable. This is achieved by adding the
2528 following to the top of the form in the ``issue.item.html``
2529 template::
2531 <input type="hidden" name="@required" value="status">
2533 this will force users to select a status.
2535 2. add a Multilink property to the status class::
2537 stat = Class(db, "status", ... , transitions=Multilink('status'),
2538 ...)
2540 and then edit the statuses already created, either:
2542 a. through the web using the class list -> status class editor, or
2543 b. using the roundup-admin "set" command.
2545 3. add an auditor module ``checktransition.py`` in your tracker's
2546 ``detectors`` directory, for example::
2548 def checktransition(db, cl, nodeid, newvalues):
2549 ''' Check that the desired transition is valid for the "status"
2550 property.
2551 '''
2552 if not newvalues.has_key('status'):
2553 return
2554 current = cl.get(nodeid, 'status')
2555 new = newvalues['status']
2556 if new == current:
2557 return
2558 ok = db.status.get(current, 'transitions')
2559 if new not in ok:
2560 raise ValueError, 'Status not allowed to move from "%s" to "%s"'%(
2561 db.status.get(current, 'name'), db.status.get(new, 'name'))
2563 def init(db):
2564 db.issue.audit('set', checktransition)
2566 4. in the ``issue.item.html`` template, change the status editing bit
2567 from::
2569 <th nowrap>Status</th>
2570 <td tal:content="structure context/status/menu">status</td>
2572 to::
2574 <th nowrap>Status</th>
2575 <td>
2576 <select tal:condition="context/id" name="status">
2577 <tal:block tal:define="ok context/status/transitions"
2578 tal:repeat="state db/status/list">
2579 <option tal:condition="python:state.id in ok"
2580 tal:attributes="
2581 value state/id;
2582 selected python:state.id == context.status.id"
2583 tal:content="state/name"></option>
2584 </tal:block>
2585 </select>
2586 <tal:block tal:condition="not:context/id"
2587 tal:replace="structure context/status/menu" />
2588 </td>
2590 which displays only the allowed status to transition to.
2593 Displaying only message summaries in the issue display
2594 ------------------------------------------------------
2596 Alter the issue.item template section for messages to::
2598 <table class="messages" tal:condition="context/messages">
2599 <tr><th colspan="5" class="header">Messages</th></tr>
2600 <tr tal:repeat="msg context/messages">
2601 <td><a tal:attributes="href string:msg${msg/id}"
2602 tal:content="string:msg${msg/id}"></a></td>
2603 <td tal:content="msg/author">author</td>
2604 <td nowrap tal:content="msg/date/pretty">date</td>
2605 <td tal:content="msg/summary">summary</td>
2606 <td>
2607 <a tal:attributes="href string:?@remove@messages=${msg/id}&@action=edit">
2608 remove</a>
2609 </td>
2610 </tr>
2611 </table>
2613 Restricting the list of users that are assignable to a task
2614 -----------------------------------------------------------
2616 1. In your tracker's "dbinit.py", create a new Role, say "Developer"::
2618 db.security.addRole(name='Developer', description='A developer')
2620 2. Just after that, create a new Permission, say "Fixer", specific to
2621 "issue"::
2623 p = db.security.addPermission(name='Fixer', klass='issue',
2624 description='User is allowed to be assigned to fix issues')
2626 3. Then assign the new Permission to your "Developer" Role::
2628 db.security.addPermissionToRole('Developer', p)
2630 4. In the issue item edit page ("html/issue.item.html" in your tracker
2631 directory), use the new Permission in restricting the "assignedto"
2632 list::
2634 <select name="assignedto">
2635 <option value="-1">- no selection -</option>
2636 <tal:block tal:repeat="user db/user/list">
2637 <option tal:condition="python:user.hasPermission(
2638 'Fixer', context._classname)"
2639 tal:attributes="
2640 value user/id;
2641 selected python:user.id == context.assignedto"
2642 tal:content="user/realname"></option>
2643 </tal:block>
2644 </select>
2646 For extra security, you may wish to setup an auditor to enforce the
2647 Permission requirement (install this as "assignedtoFixer.py" in your
2648 tracker "detectors" directory)::
2650 def assignedtoMustBeFixer(db, cl, nodeid, newvalues):
2651 ''' Ensure the assignedto value in newvalues is a used with the
2652 Fixer Permission
2653 '''
2654 if not newvalues.has_key('assignedto'):
2655 # don't care
2656 return
2658 # get the userid
2659 userid = newvalues['assignedto']
2660 if not db.security.hasPermission('Fixer', userid, cl.classname):
2661 raise ValueError, 'You do not have permission to edit %s'%cl.classname
2663 def init(db):
2664 db.issue.audit('set', assignedtoMustBeFixer)
2665 db.issue.audit('create', assignedtoMustBeFixer)
2667 So now, if an edit action attempts to set "assignedto" to a user that
2668 doesn't have the "Fixer" Permission, the error will be raised.
2671 Setting up a "wizard" (or "druid") for controlled adding of issues
2672 ------------------------------------------------------------------
2674 1. Set up the page templates you wish to use for data input. My wizard
2675 is going to be a two-step process: first figuring out what category
2676 of issue the user is submitting, and then getting details specific to
2677 that category. The first page includes a table of help, explaining
2678 what the category names mean, and then the core of the form::
2680 <form method="POST" onSubmit="return submit_once()"
2681 enctype="multipart/form-data">
2682 <input type="hidden" name="@template" value="add_page1">
2683 <input type="hidden" name="@action" value="page1submit">
2685 <strong>Category:</strong>
2686 <tal:block tal:replace="structure context/category/menu" />
2687 <input type="submit" value="Continue">
2688 </form>
2690 The next page has the usual issue entry information, with the
2691 addition of the following form fragments::
2693 <form method="POST" onSubmit="return submit_once()"
2694 enctype="multipart/form-data"
2695 tal:condition="context/is_edit_ok"
2696 tal:define="cat request/form/category/value">
2698 <input type="hidden" name="@template" value="add_page2">
2699 <input type="hidden" name="@required" value="title">
2700 <input type="hidden" name="category" tal:attributes="value cat">
2701 .
2702 .
2703 .
2704 </form>
2706 Note that later in the form, I test the value of "cat" include form
2707 elements that are appropriate. For example::
2709 <tal:block tal:condition="python:cat in '6 10 13 14 15 16 17'.split()">
2710 <tr>
2711 <th nowrap>Operating System</th>
2712 <td tal:content="structure context/os/field"></td>
2713 </tr>
2714 <tr>
2715 <th nowrap>Web Browser</th>
2716 <td tal:content="structure context/browser/field"></td>
2717 </tr>
2718 </tal:block>
2720 ... the above section will only be displayed if the category is one
2721 of 6, 10, 13, 14, 15, 16 or 17.
2723 3. Determine what actions need to be taken between the pages - these are
2724 usually to validate user choices and determine what page is next. Now
2725 encode those actions in methods on the ``interfaces.Client`` class
2726 and insert hooks to those actions in the "actions" attribute on that
2727 class, like so::
2729 actions = client.Client.actions + (
2730 ('page1_submit', 'page1SubmitAction'),
2731 )
2733 def page1SubmitAction(self):
2734 ''' Verify that the user has selected a category, and then move
2735 on to page 2.
2736 '''
2737 category = self.form['category'].value
2738 if category == '-1':
2739 self.error_message.append('You must select a category of report')
2740 return
2741 # everything's ok, move on to the next page
2742 self.template = 'add_page2'
2744 4. Use the usual "new" action as the ``@action`` on the final page, and
2745 you're done (the standard context/submit method can do this for you).
2748 Using an external password validation source
2749 --------------------------------------------
2751 We have a centrally-managed password changing system for our users. This
2752 results in a UN*X passwd-style file that we use for verification of
2753 users. Entries in the file consist of ``name:password`` where the
2754 password is encrypted using the standard UN*X ``crypt()`` function (see
2755 the ``crypt`` module in your Python distribution). An example entry
2756 would be::
2758 admin:aamrgyQfDFSHw
2760 Each user of Roundup must still have their information stored in the
2761 Roundup database - we just use the passwd file to check their password.
2762 To do this, we add the following code to our ``Client`` class in the
2763 tracker home ``interfaces.py`` module::
2765 def verifyPassword(self, userid, password):
2766 # get the user's username
2767 username = self.db.user.get(userid, 'username')
2769 # the passwords are stored in the "passwd.txt" file in the
2770 # tracker home
2771 file = os.path.join(self.db.config.TRACKER_HOME, 'passwd.txt')
2773 # see if we can find a match
2774 for ent in [line.strip().split(':') for line in
2775 open(file).readlines()]:
2776 if ent[0] == username:
2777 return crypt.crypt(password, ent[1][:2]) == ent[1]
2779 # user doesn't exist in the file
2780 return 0
2782 What this does is look through the file, line by line, looking for a
2783 name that matches.
2785 We also remove the redundant password fields from the ``user.item``
2786 template.
2789 Adding a "vacation" flag to users for stopping nosy messages
2790 ------------------------------------------------------------
2792 When users go on vacation and set up vacation email bouncing, you'll
2793 start to see a lot of messages come back through Roundup "Fred is on
2794 vacation". Not very useful, and relatively easy to stop.
2796 1. add a "vacation" flag to your users::
2798 user = Class(db, "user",
2799 username=String(), password=Password(),
2800 address=String(), realname=String(),
2801 phone=String(), organisation=String(),
2802 alternate_addresses=String(),
2803 roles=String(), queries=Multilink("query"),
2804 vacation=Boolean())
2806 2. So that users may edit the vacation flags, add something like the
2807 following to your ``user.item`` template::
2809 <tr>
2810 <th>On Vacation</th>
2811 <td tal:content="structure context/vacation/field">vacation</td>
2812 </tr>
2814 3. edit your detector ``nosyreactor.py`` so that the ``nosyreaction()``
2815 consists of::
2817 def nosyreaction(db, cl, nodeid, oldvalues):
2818 # send a copy of all new messages to the nosy list
2819 for msgid in determineNewMessages(cl, nodeid, oldvalues):
2820 try:
2821 users = db.user
2822 messages = db.msg
2824 # figure the recipient ids
2825 sendto = []
2826 r = {}
2827 recipients = messages.get(msgid, 'recipients')
2828 for recipid in messages.get(msgid, 'recipients'):
2829 r[recipid] = 1
2831 # figure the author's id, and indicate they've received
2832 # the message
2833 authid = messages.get(msgid, 'author')
2835 # possibly send the message to the author, as long as
2836 # they aren't anonymous
2837 if (db.config.MESSAGES_TO_AUTHOR == 'yes' and
2838 users.get(authid, 'username') != 'anonymous'):
2839 sendto.append(authid)
2840 r[authid] = 1
2842 # now figure the nosy people who weren't recipients
2843 nosy = cl.get(nodeid, 'nosy')
2844 for nosyid in nosy:
2845 # Don't send nosy mail to the anonymous user (that
2846 # user shouldn't appear in the nosy list, but just
2847 # in case they do...)
2848 if users.get(nosyid, 'username') == 'anonymous':
2849 continue
2850 # make sure they haven't seen the message already
2851 if not r.has_key(nosyid):
2852 # send it to them
2853 sendto.append(nosyid)
2854 recipients.append(nosyid)
2856 # generate a change note
2857 if oldvalues:
2858 note = cl.generateChangeNote(nodeid, oldvalues)
2859 else:
2860 note = cl.generateCreateNote(nodeid)
2862 # we have new recipients
2863 if sendto:
2864 # filter out the people on vacation
2865 sendto = [i for i in sendto
2866 if not users.get(i, 'vacation', 0)]
2868 # map userids to addresses
2869 sendto = [users.get(i, 'address') for i in sendto]
2871 # update the message's recipients list
2872 messages.set(msgid, recipients=recipients)
2874 # send the message
2875 cl.send_message(nodeid, msgid, note, sendto)
2876 except roundupdb.MessageSendError, message:
2877 raise roundupdb.DetectorError, message
2879 Note that this is the standard nosy reaction code, with the small
2880 addition of::
2882 # filter out the people on vacation
2883 sendto = [i for i in sendto if not users.get(i, 'vacation', 0)]
2885 which filters out the users that have the vacation flag set to true.
2888 Adding a time log to your issues
2889 --------------------------------
2891 We want to log the dates and amount of time spent working on issues, and
2892 be able to give a summary of the total time spent on a particular issue.
2894 1. Add a new class to your tracker ``dbinit.py``::
2896 # storage for time logging
2897 timelog = Class(db, "timelog", period=Interval())
2899 Note that we automatically get the date of the time log entry
2900 creation through the standard property "creation".
2902 2. Link to the new class from your issue class (again, in
2903 ``dbinit.py``)::
2905 issue = IssueClass(db, "issue",
2906 assignedto=Link("user"), topic=Multilink("keyword"),
2907 priority=Link("priority"), status=Link("status"),
2908 times=Multilink("timelog"))
2910 the "times" property is the new link to the "timelog" class.
2912 3. We'll need to let people add in times to the issue, so in the web
2913 interface we'll have a new entry field. This is a special field
2914 because unlike the other fields in the issue.item template, it
2915 affects a different item (a timelog item) and not the template's
2916 item, an issue. We have a special syntax for form fields that affect
2917 items other than the template default item (see the cgi
2918 documentation on `special form variables`_). In particular, we add a
2919 field to capture a new timelog item's perdiod::
2921 <tr>
2922 <th nowrap>Time Log</th>
2923 <td colspan=3><input type="text" name="timelog-1@period" />
2924 <br />(enter as '3y 1m 4d 2:40:02' or parts thereof)
2925 </td>
2926 </tr>
2928 and another hidden field that links that new timelog item (new
2929 because it's marked as having id "-1") to the issue item. It looks
2930 like this::
2932 <input type="hidden" name="@link@times" value="timelog-1" />
2934 On submission, the "-1" timelog item will be created and assigned a
2935 real item id. The "times" property of the issue will have the new id
2936 added to it.
2938 4. We want to display a total of the time log times that have been
2939 accumulated for an issue. To do this, we'll need to actually write
2940 some Python code, since it's beyond the scope of PageTemplates to
2941 perform such calculations. We do this by adding a method to the
2942 TemplatingUtils class in our tracker ``interfaces.py`` module::
2944 class TemplatingUtils:
2945 ''' Methods implemented on this class will be available to HTML
2946 templates through the 'utils' variable.
2947 '''
2948 def totalTimeSpent(self, times):
2949 ''' Call me with a list of timelog items (which have an
2950 Interval "period" property)
2951 '''
2952 total = Interval('')
2953 for time in times:
2954 total += time.period._value
2955 return total
2957 Replace the ``pass`` line as we did in step 4 above with the Client
2958 class. As indicated in the docstrings, we will be able to access the
2959 ``totalTimeSpent`` method via the ``utils`` variable in our
2960 templates.
2962 5. Display the time log for an issue::
2964 <table class="otherinfo" tal:condition="context/times">
2965 <tr><th colspan="3" class="header">Time Log
2966 <tal:block
2967 tal:replace="python:utils.totalTimeSpent(context.times)" />
2968 </th></tr>
2969 <tr><th>Date</th><th>Period</th><th>Logged By</th></tr>
2970 <tr tal:repeat="time context/times">
2971 <td tal:content="time/creation"></td>
2972 <td tal:content="time/period"></td>
2973 <td tal:content="time/creator"></td>
2974 </tr>
2975 </table>
2977 I put this just above the Messages log in my issue display. Note our
2978 use of the ``totalTimeSpent`` method which will total up the times
2979 for the issue and return a new Interval. That will be automatically
2980 displayed in the template as text like "+ 1y 2:40" (1 year, 2 hours
2981 and 40 minutes).
2983 8. If you're using a persistent web server - roundup-server or
2984 mod_python for example - then you'll need to restart that to pick up
2985 the code changes. When that's done, you'll be able to use the new
2986 time logging interface.
2988 Using a UN*X passwd file as the user database
2989 ---------------------------------------------
2991 On some systems the primary store of users is the UN*X passwd file. It
2992 holds information on users such as their username, real name, password
2993 and primary user group.
2995 Roundup can use this store as its primary source of user information,
2996 but it needs additional information too - email address(es), roundup
2997 Roles, vacation flags, roundup hyperdb item ids, etc. Also, "retired"
2998 users must still exist in the user database, unlike some passwd files in
2999 which the users are removed when they no longer have access to a system.
3001 To make use of the passwd file, we therefore synchronise between the two
3002 user stores. We also use the passwd file to validate the user logins, as
3003 described in the previous example, `using an external password
3004 validation source`_. We keep the users lists in sync using a fairly
3005 simple script that runs once a day, or several times an hour if more
3006 immediate access is needed. In short, it:
3008 1. parses the passwd file, finding usernames, passwords and real names,
3009 2. compares that list to the current roundup user list:
3011 a. entries no longer in the passwd file are *retired*
3012 b. entries with mismatching real names are *updated*
3013 c. entries only exist in the passwd file are *created*
3015 3. send an email to administrators to let them know what's been done.
3017 The retiring and updating are simple operations, requiring only a call
3018 to ``retire()`` or ``set()``. The creation operation requires more
3019 information though - the user's email address and their roundup Roles.
3020 We're going to assume that the user's email address is the same as their
3021 login name, so we just append the domain name to that. The Roles are
3022 determined using the passwd group identifier - mapping their UN*X group
3023 to an appropriate set of Roles.
3025 The script to perform all this, broken up into its main components, is
3026 as follows. Firstly, we import the necessary modules and open the
3027 tracker we're to work on::
3029 import sys, os, smtplib
3030 from roundup import instance, date
3032 # open the tracker
3033 tracker_home = sys.argv[1]
3034 tracker = instance.open(tracker_home)
3036 Next we read in the *passwd* file from the tracker home::
3038 # read in the users
3039 file = os.path.join(tracker_home, 'users.passwd')
3040 users = [x.strip().split(':') for x in open(file).readlines()]
3042 Handle special users (those to ignore in the file, and those who don't
3043 appear in the file)::
3045 # users to not keep ever, pre-load with the users I know aren't
3046 # "real" users
3047 ignore = ['ekmmon', 'bfast', 'csrmail']
3049 # users to keep - pre-load with the roundup-specific users
3050 keep = ['comment_pool', 'network_pool', 'admin', 'dev-team',
3051 'cs_pool', 'anonymous', 'system_pool', 'automated']
3053 Now we map the UN*X group numbers to the Roles that users should have::
3055 roles = {
3056 '501': 'User,Tech', # tech
3057 '502': 'User', # finance
3058 '503': 'User,CSR', # customer service reps
3059 '504': 'User', # sales
3060 '505': 'User', # marketing
3061 }
3063 Now we do all the work. Note that the body of the script (where we have
3064 the tracker database open) is wrapped in a ``try`` / ``finally`` clause,
3065 so that we always close the database cleanly when we're finished. So, we
3066 now do all the work::
3068 # open the database
3069 db = tracker.open('admin')
3070 try:
3071 # store away messages to send to the tracker admins
3072 msg = []
3074 # loop over the users list read in from the passwd file
3075 for user,passw,uid,gid,real,home,shell in users:
3076 if user in ignore:
3077 # this user shouldn't appear in our tracker
3078 continue
3079 keep.append(user)
3080 try:
3081 # see if the user exists in the tracker
3082 uid = db.user.lookup(user)
3084 # yes, they do - now check the real name for correctness
3085 if real != db.user.get(uid, 'realname'):
3086 db.user.set(uid, realname=real)
3087 msg.append('FIX %s - %s'%(user, real))
3088 except KeyError:
3089 # nope, the user doesn't exist
3090 db.user.create(username=user, realname=real,
3091 address='%s@ekit-inc.com'%user, roles=roles[gid])
3092 msg.append('ADD %s - %s (%s)'%(user, real, roles[gid]))
3094 # now check that all the users in the tracker are also in our
3095 # "keep" list - retire those who aren't
3096 for uid in db.user.list():
3097 user = db.user.get(uid, 'username')
3098 if user not in keep:
3099 db.user.retire(uid)
3100 msg.append('RET %s'%user)
3102 # if we did work, then send email to the tracker admins
3103 if msg:
3104 # create the email
3105 msg = '''Subject: %s user database maintenance
3107 %s
3108 '''%(db.config.TRACKER_NAME, '\n'.join(msg))
3110 # send the email
3111 smtp = smtplib.SMTP(db.config.MAILHOST)
3112 addr = db.config.ADMIN_EMAIL
3113 smtp.sendmail(addr, addr, msg)
3115 # now we're done - commit the changes
3116 db.commit()
3117 finally:
3118 # always close the database cleanly
3119 db.close()
3121 And that's it!
3124 Using an LDAP database for user information
3125 -------------------------------------------
3127 A script that reads users from an LDAP store using
3128 http://python-ldap.sf.net/ and then compares the list to the users in the
3129 roundup user database would be pretty easy to write. You'd then have it run
3130 once an hour / day (or on demand if you can work that into your LDAP store
3131 workflow). See the example `Using a UN*X passwd file as the user database`_
3132 for more information about doing this.
3134 To authenticate off the LDAP store (rather than using the passwords in the
3135 roundup user database) you'd use the same python-ldap module inside an
3136 extension to the cgi interface. You'd do this by adding a method called
3137 "verifyPassword" to the Client class in your tracker's interfaces.py
3138 module. The method is implemented by default as::
3140 def verifyPassword(self, userid, password):
3141 ''' Verify the password that the user has supplied
3142 '''
3143 stored = self.db.user.get(self.userid, 'password')
3144 if password == stored:
3145 return 1
3146 if not password and not stored:
3147 return 1
3148 return 0
3150 So you could reimplement this as something like::
3152 def verifyPassword(self, userid, password):
3153 ''' Verify the password that the user has supplied
3154 '''
3155 # look up some unique LDAP information about the user
3156 username = self.db.user.get(self.userid, 'username')
3157 # now verify the password supplied against the LDAP store
3160 Enabling display of either message summaries or the entire messages
3161 -------------------------------------------------------------------
3163 This is pretty simple - all we need to do is copy the code from the
3164 example `displaying only message summaries in the issue display`_ into
3165 our template alongside the summary display, and then introduce a switch
3166 that shows either one or the other. We'll use a new form variable,
3167 ``@whole_messages`` to achieve this::
3169 <table class="messages" tal:condition="context/messages">
3170 <tal:block tal:condition="not:request/form/@whole_messages/value | python:0">
3171 <tr><th colspan="3" class="header">Messages</th>
3172 <th colspan="2" class="header">
3173 <a href="?@whole_messages=yes">show entire messages</a>
3174 </th>
3175 </tr>
3176 <tr tal:repeat="msg context/messages">
3177 <td><a tal:attributes="href string:msg${msg/id}"
3178 tal:content="string:msg${msg/id}"></a></td>
3179 <td tal:content="msg/author">author</td>
3180 <td nowrap tal:content="msg/date/pretty">date</td>
3181 <td tal:content="msg/summary">summary</td>
3182 <td>
3183 <a tal:attributes="href string:?@remove@messages=${msg/id}&@action=edit">remove</a>
3184 </td>
3185 </tr>
3186 </tal:block>
3188 <tal:block tal:condition="request/form/@whole_messages/value | python:0">
3189 <tr><th colspan="2" class="header">Messages</th>
3190 <th class="header">
3191 <a href="?@whole_messages=">show only summaries</a>
3192 </th>
3193 </tr>
3194 <tal:block tal:repeat="msg context/messages">
3195 <tr>
3196 <th tal:content="msg/author">author</th>
3197 <th nowrap tal:content="msg/date/pretty">date</th>
3198 <th style="text-align: right">
3199 (<a tal:attributes="href string:?@remove@messages=${msg/id}&@action=edit">remove</a>)
3200 </th>
3201 </tr>
3202 <tr><td colspan="3" tal:content="msg/content"></td></tr>
3203 </tal:block>
3204 </tal:block>
3205 </table>
3208 Blocking issues that depend on other issues
3209 -------------------------------------------
3211 We needed the ability to mark certain issues as "blockers" - that is,
3212 they can't be resolved until another issue (the blocker) they rely on is
3213 resolved. To achieve this:
3215 1. Create a new property on the issue Class,
3216 ``blockers=Multilink("issue")``. Edit your tracker's dbinit.py file.
3217 Where the "issue" class is defined, something like::
3219 issue = IssueClass(db, "issue",
3220 assignedto=Link("user"), topic=Multilink("keyword"),
3221 priority=Link("priority"), status=Link("status"))
3223 add the blockers entry like so::
3225 issue = IssueClass(db, "issue",
3226 blockers=Multilink("issue"),
3227 assignedto=Link("user"), topic=Multilink("keyword"),
3228 priority=Link("priority"), status=Link("status"))
3230 2. Add the new "blockers" property to the issue.item edit page, using
3231 something like::
3233 <th nowrap>Waiting On</th>
3234 <td>
3235 <span tal:replace="structure python:context.blockers.field(showid=1,
3236 size=20)" />
3237 <span tal:replace="structure python:db.issue.classhelp('id,title')" />
3238 <span tal:condition="context/blockers"
3239 tal:repeat="blk context/blockers">
3240 <br>View: <a tal:attributes="href string:issue${blk/id}"
3241 tal:content="blk/id"></a>
3242 </span>
3244 You'll need to fiddle with your item page layout to find an
3245 appropriate place to put it - I'll leave that fun part up to you.
3246 Just make sure it appears in the first table, possibly somewhere near
3247 the "superseders" field.
3249 3. Create a new detector module (attached) which enforces the rules:
3251 - issues may not be resolved if they have blockers
3252 - when a blocker is resolved, it's removed from issues it blocks
3254 The contents of the detector should be something like this::
3256 def blockresolution(db, cl, nodeid, newvalues):
3257 ''' If the issue has blockers, don't allow it to be resolved.
3258 '''
3259 if nodeid is None:
3260 blockers = []
3261 else:
3262 blockers = cl.get(nodeid, 'blockers')
3263 blockers = newvalues.get('blockers', blockers)
3265 # don't do anything if there's no blockers or the status hasn't
3266 # changed
3267 if not blockers or not newvalues.has_key('status'):
3268 return
3270 # get the resolved state ID
3271 resolved_id = db.status.lookup('resolved')
3273 # format the info
3274 u = db.config.TRACKER_WEB
3275 s = ', '.join(['<a href="%sissue%s">%s</a>'%(
3276 u,id,id) for id in blockers])
3277 if len(blockers) == 1:
3278 s = 'issue %s is'%s
3279 else:
3280 s = 'issues %s are'%s
3282 # ok, see if we're trying to resolve
3283 if newvalues['status'] == resolved_id:
3284 raise ValueError, "This issue can't be resolved until %s resolved."%s
3286 def resolveblockers(db, cl, nodeid, newvalues):
3287 ''' When we resolve an issue that's a blocker, remove it from the
3288 blockers list of the issue(s) it blocks.
3289 '''
3290 if not newvalues.has_key('status'):
3291 return
3293 # get the resolved state ID
3294 resolved_id = db.status.lookup('resolved')
3296 # interesting?
3297 if newvalues['status'] != resolved_id:
3298 return
3300 # yes - find all the blocked issues, if any, and remove me from
3301 # their blockers list
3302 issues = cl.find(blockers=nodeid)
3303 for issueid in issues:
3304 blockers = cl.get(issueid, 'blockers')
3305 if nodeid in blockers:
3306 blockers.remove(nodeid)
3307 cl.set(issueid, blockers=blockers)
3310 def init(db):
3311 # might, in an obscure situation, happen in a create
3312 db.issue.audit('create', blockresolution)
3313 db.issue.audit('set', blockresolution)
3315 # can only happen on a set
3316 db.issue.react('set', resolveblockers)
3318 Put the above code in a file called "blockers.py" in your tracker's
3319 "detectors" directory.
3321 4. Finally, and this is an optional step, modify the tracker web page
3322 URLs so they filter out issues with any blockers. You do this by
3323 adding an additional filter on "blockers" for the value "-1". For
3324 example, the existing "Show All" link in the "page" template (in the
3325 tracker's "html" directory) looks like this::
3327 <a href="issue?:sort=-activity&:group=priority&:filter=status&:columns=id,activity,title,creator,assignedto,status&status=-1,1,2,3,4,5,6,7">Show All</a><br>
3329 modify it to add the "blockers" info to the URL (note, both the
3330 ":filter" *and* "blockers" values must be specified)::
3332 <a href="issue?:sort=-activity&:group=priority&:filter=status,blockers&blockers=-1&:columns=id,activity,title,creator,assignedto,status&status=-1,1,2,3,4,5,6,7">Show All</a><br>
3334 That's it. You should now be able to set blockers on your issues. Note
3335 that if you want to know whether an issue has any other issues dependent
3336 on it (i.e. it's in their blockers list) you can look at the journal
3337 history at the bottom of the issue page - look for a "link" event to
3338 another issue's "blockers" property.
3341 -------------------
3343 Back to `Table of Contents`_
3345 .. _`Table of Contents`: index.html
3346 .. _`design documentation`: design.html