repoze.bfg 1.1.5

A WSGI web framework influenced by Zope, Django, and Pylons

repoze.bfg

repoze.bfg is a Python web application framework based on WSGI. It is inspired by Zope, Pylons, and Django.

Support and Documentation

See the repoze.bfg website to view documentation, report bugs, and obtain support.

License

repoze.bfg is offered under the BSD-derived Repoze Public License.

Authors

repoze.bfg is made available by Agendaless Consulting and a team of contributors.

1.1.5 (2009-12-07)

• Operation on GAE was broken, presumably because the repoze.bfg.includes configure.zcml file began to attempt to import the repoze.bfg.chameleon_zpt and repoze.bfg.chameleon_text modules, and these cannot be used on non-CPython platforms. It now tolerates startup time import failures for these modules, and only raise an import error when a template from one of these packages is actually used (backport from trunk).

1.1.4 (2009-12-02)

• When two views were registered with differering for interfaces or classes, and the for of first view registered was a superclass of the second, the repoze.bfg view machinery would incorrectly associate the two views with the same “multiview”. Multiviews are meant to be collections of views that have exactly the same for/request/viewname values, without taking inheritance into account. Symptom: wrong view callable found even when you had correctly specified a for_ interface/class during view configuration for one or both view configurations (backport from trunk).

1.1.3 (2009-12-02)

Bug Fixes

• The repoze.bfg.url.route_url function inappropriately passed along _query and/or _anchor arguments to the mapper.generate function, resulting in blowups (backport from trunk).

1.1.2 (2009-11-26)

Bug Fixes

• When two views were registered with the same accept argument, but were otherwise registered with the same arguments, if a request entered the application which had an Accept header that accepted either of the media types defined by the set of views registered with predicates that otherwise matched, a more or less “random” one view would “win”. Now, we try harder to use the view callable associated with the view configuration that has the most specific accept argument. Thanks to Alberto Valverde. (backport from trunk).

• The ACL authorization policy debugging output when debug_authorization console debugging output was turned on wasn’t as clear as it could have been when a view execution was denied due to an authorization failure resulting from the set of principals passed never having matched any ACE in any ACL in the lineage. Now in this case, we report <default deny> as the ACE value and either the root ACL or <No ACL found on any object in model lineage> if no ACL was found. (backport from trunk).

1.1.1 (2009-11-21)

Bug Fixes

• “Hybrid mode” applications (applications which explicitly used traversal after url dispatch via <route> paths containing the *traverse element) were broken in 1.1-final and all 1.1 alpha and beta releases. Views registered without a route_name route shadowed views registered with a route_name inappropriately.

1.1 (2009-11-15)

Internals

• Remove dead IRouteRequirement interface from repoze.bfg.zcml module.

Documentation

• Improve the “Extending an Existing Application” narrative chapter.

• Add more sections to the “Defending Design” chapter.

1.1b4 (2009-11-12)

Bug Fixes

• Use alsoProvides in the urldispatch module to attach an interface to the request rather than directlyProvides to avoid disturbing interfaces set in a NewRequest event handler.

Documentation

• Move 1.0.1 and previous changelog to HISTORY.txt.

• Add examples to repoze.bfg.url.model_url docstring.

• Add “Defending BFG Design” chapter to frontpage docs.

Templates

• Remove ez_setup.py and its import from all paster templates, samples, and tutorials for distribute compatibility. The documentation already explains how to install virtualenv (which will include some setuptools package), so these files, imports and usages were superfluous.

Deprecations

• The options kw arg to the repoze.bfg.router.make_app function is deprecated. In its place is the keyword argument settings. The options keyword continues to work, and a deprecation warning is not emitted when it is detected. However, the paster templates, code samples, and documentation now make reference to settings rather than options. This change/deprecation was mainly made for purposes of clarity and symmetry with the get_settings() API and dicussions of “settings” in various places in the docs: we want to use the same name to refer to the same thing everywhere.

1.1b3 (2009-11-06)

Features

• repoze.bfg.testing.registerRoutesMapper testing facility added. This testing function registers a routes “mapper” object in the registry, for tests which require its presence. This function is documented in the repoze.bfg.testing API documentation.

Bug Fixes

• Compound statements that used an assignment entered into in an interactive IPython session invoked via paster bfgshell no longer fail to mutate the shell namespace correctly. For example, this set of statements used to fail:

  In [2]: def bar(x): return x
    ...:
  In [3]: list(bar(x) for x in 'abc')
  Out[3]: NameError: 'bar'

  In this release, the bar function is found and the correct output is now sent to the console. Thanks to Daniel Holth for the patch.

• The bfgshell command did not function properly; it was still expecting to be able to call the root factory with a bare environ rather than a request object.

Backwards Incompatibilities

• The repoze.bfg.scripting.get_root function now expects a request object as its second argument rather than an environ.

1.1b2 (2009-11-02)

Bug Fixes

• Prevent PyPI installation failure due to easy_install trying way too hard to guess the best version of Paste. When easy_install pulls from PyPI it reads links off various pages to determine “more up to date” versions. It incorrectly picks up a link for an ancient version of a package named “Paste-Deploy-0.1” (note the dash) when trying to find the “Paste” distribution and somehow believes it’s the latest version of “Paste”. It also somehow “helpfully” decides to check out a version of this package from SVN. We pin the Paste dependency version to a version greater than 1.7 to work around this easy_install bug.

Documentation

• Fix “Hybrid” narrative chapter: stop claiming that <view> statements that mention a route_name need to come afer (in XML order) the <route> statement which creates the route. This hasn’t been true since 1.1a1.

• “What’s New in repoze.bfg 1.1” document added to narrative documentation.

Features

• Add a new event type: repoze.bfg.events.AfterTraversal. Events of this type will be sent after traversal is completed, but before any view code is invoked. Like repoze.bfg.events.NewRequest, This event will have a single attribute: request representing the current request. Unlike the request attribute of repoze.bfg.events.NewRequest however, during an AfterTraversal event, the request object will possess attributes set by the traverser, most notably context, which will be the context used when a view is found and invoked. The interface repoze.bfg.events.IAfterTraversal can be used to subscribe to the event. For example:

  <subscriber for="repoze.bfg.interfaces.IAfterTraversal"
              handler="my.app.handle_after_traverse"/>

  Like any framework event, a subscriber function should expect one parameter: event.

Dependencies

• Rather than depending on chameleon.core and chameleon.zpt distributions individually, depend on Malthe’s repackaged Chameleon distribution (which includes both chameleon.core and chameleon.zpt).

1.1b1 (2009-11-01)

Bug Fixes

• The routes root factory called route factories and the default route factory with an environ rather than a request. One of the symptoms of this bug: applications generated using the bfg_zodb paster template in 1.1a9 did not work properly.

• Reinstate renderer alias for view_renderer in the <route> ZCML directive (in-the-wild 1.1a bw compat).

• bfg_routesalchemy paster template: change <route> declarations: rename renderer attribute to view_renderer.

• Header values returned by the authtktauthenticationpolicy remember and forget methods would be of type unicode. This violated the WSGI spec, causing a TypeError to be raised when these headers were used under mod_wsgi.

• If a BFG app that had a route matching the root URL was mounted under a path in modwsgi, ala WSGIScriptAlias /myapp /Users/chrism/projects/modwsgi/env/bfg.wsgi, the home route (a route with the path of '/' or '') would not match when the path /myapp was visited (only when the path /myapp/ was visited). This is now fixed: if the urldispatch root factory notes that the PATH_INFO is empty, it converts it to a single slash before trying to do matching.

Documentation

• In <route> declarations in tutorial ZCML, rename renderer attribute to view_renderer (fwd compat).

• Fix various tutorials broken by 1.1a9 <route> directive changes.

Internal

• Deal with a potential circref in the traversal module.

1.1a9 (2009-10-31)

Bug Fixes

• An incorrect ZCML conflict would be encountered when the request_param predicate attribute was used on the ZCML view directive if any two otherwise same-predicated views had the combination of a predicate value with an = sign and one without (e.g. a vs. a=123).

Features

• In previous versions of BFG, the “root factory” (the get_root callable passed to make_app or a function pointed to by the factory attribute of a route) was called with a “bare” WSGI environment. In this version, and going forward, it will be called with a request object. The request object passed to the factory implements dictionary-like methods in such a way that existing root factory code which expects to be passed an environ will continue to work.

• The __call__ of a plugin “traverser” implementation (registered as an adapter for ITraverser or ITraverserFactory) will now receive a request as the single argument to its __call__ method. In previous versions it was passed a WSGI environ object. The request object passed to the factory implements dictionary-like methods in such a way that existing traverser code which expects to be passed an environ will continue to work.

• The ZCML route directive’s attributes xhr, request_method, path_info, request_param, header and accept are now route predicates rather than view predicates. If one or more of these predicates is specified in the route configuration, all of the predicates must return true for the route to match a request. If one or more of the route predicates associated with a route returns False when checked during a request, the route match fails, and the next match in the routelist is tried. This differs from the previous behavior, where no route predicates existed and all predicates were considered view predicates, because in that scenario, the next route was not tried.

Documentation

• Various changes were made to narrative and API documentation supporting the change from passing a request rather than an environ to root factories and traversers.

Internal

• The request implements dictionary-like methods that mutate and query the WSGI environ. This is only for the purpose of backwards compatibility with root factories which expect an environ rather than a request.

• The repoze.bfg.request.create_route_request_factory function, which returned a request factory was removed in favor of a repoze.bfg.request.route_request_interface function, which returns an interface.

• The repoze.bfg.request.Request class, which is a subclass of webob.Request now defines its own __setattr__, __getattr__ and __delattr__ methods, which override the default WebOb behavior. The default WebOb behavior stores attributes of the request in self.environ['webob.adhoc_attrs'], and retrieves them from that dictionary during a __getattr__. This behavior was undesirable for speed and “expectation” reasons. Now attributes of the request are stored in request.__dict__ (as you otherwise might expect from an object that did not override these methods).

• The router no longer calls repoze.bfg.traversal._traverse and does its work “inline” (speed).

• Reverse the order in which the router calls the request factory and the root factory. The request factory is now called first; the resulting request is passed to the root factory.

• The repoze.bfg.request.request_factory function has been removed. Its functionality is no longer required.

• The “routes root factory” that wraps the default root factory when there are routes mentioned in the configuration now attaches an interface to the request via zope.interface.directlyProvides. This replaces logic in the (now-gone) repoze.bfg.request.request_factory function.

• The route and view ZCML directives now register an interface as a named utility (retrieved from repoze.bfg.request.route_request_interface) rather than a request factory (the previous return value of the now-missing repoze.bfg.request.create_route_request_factory.

• The repoze.bfg.functional module was renamed to repoze.bfg.compat.

Backwards Incompatibilities

• Explicitly revert the feature introduced in 1.1a8: where the name root is available as an attribute of the request before a NewRequest event is emitted. This makes some potential future features impossible, or at least awkward (such as grouping traversal and view lookup into a single adapter lookup).

• The containment, attr and renderer attributes of the route ZCML directive were removed.

1.1a8 (2009-10-27)

Features

• Add path_info view configuration predicate.

• paster bfgshell now supports IPython if it’s available for import. Thanks to Daniel Holth for the initial patch.

• Add repoze.bfg.testing.registerSettings API, which is documented in the “repoze.bfg.testing” API chapter. This allows for registration of “settings” values obtained via repoze.bfg.settings.get_settings() for use in unit tests.

• The name root is available as an attribute of the request slightly earlier now (before a NewRequest event is emitted). root is the result of the application “root factory”.

• Added max_age parameter to authtktauthenticationpolicy ZCML directive. If this value is set, it must be an integer representing the number of seconds which the auth tkt cookie will survive. Mainly, its existence allows the auth_tkt cookie to survive across browser sessions.

Bug Fixes

• Fix bug encountered during “scan” (when <scan ..> directive is used in ZCML) introduced in 1.1a7. Symptom: AttributeError: object has no attribute __provides__ raised at startup time.

• The reissue_time argument to the authtktauthenticationpolicy ZCML directive now actually works. When it is set to an integer value, an authticket set-cookie header is appended to the response whenever a request requires authentication and ‘now’ minus the authticket’s timestamp is greater than reissue_time seconds.

Documentation

• Add a chapter titled “Request and Response” to the narrative documentation, content cribbed from the WebOb documentation.

• Call out predicate attributes of ZCML directive within “Views” chapter.

• Fix route_url documentation (_query argument documented as query and _anchor argument documented as anchor).

Backwards Incompatibilities

• The authtkt authentication policy remember method now no longer honors token or userdata keyword arguments.

Internal

• Change how bfg_view decorator works when used as a class method decorator. In 1.1a7, the``scan``directive actually tried to grope every class in scanned package at startup time, calling dir against each found class, and subsequently invoking getattr against each thing found by dir to see if it was a method. This led to some strange symptoms (e.g. AttributeError: object has no attribute __provides__), and was generally just a bad idea. Now, instead of groping classes for methods at startup time, we just cause the bfg_view decorator itself to populate the method’s class’ __dict__ when it is used as a method decorator. This also requires a nasty _getframe thing but it’s slightly less nasty than the startup time groping behavior. This is essentially a reversion back to 1.1a6 “grokking” behavior plus some special magic for using the bfg_view decorator as method decorator inside the bfg_view class itself.

• The router now checks for a global_response_headers attribute of the request object before returning a response. If this value exists, it is presumed to be a sequence of two-tuples, representing a set of headers to append to the ‘normal’ response headers. This feature is internal, rather than exposed externally, because it’s unclear whether it will stay around in the long term. It was added to support the reissue_time feature of the authtkt authentication policy.

• The interface ITraverserFactory is now just an alias for ITraverser.

1.1a7 (2009-10-18)

Features

• More than one @bfg_view decorator may now be stacked on top of any number of others. Each invocation of the decorator registers a single view configuration. For instance, the following combination of decorators and a function will register two view configurations for the same view callable:

  from repoze.bfg.view import bfg_view
  
  @bfg_view(name='edit')
  @bfg_view(name='change')
  def edit(context, request):
      pass

  This makes it possible to associate more than one view configuration with a single callable without requiring any ZCML.

• The @bfg_view decorator can now be used against a class method:

  from webob import Response
  from repoze.bfg.view import bfg_view
  
  class MyView(object):
      def __init__(self, context, request):
          self.context = context
          self.request = request
  
      @bfg_view(name='hello')
      def amethod(self):
          return Response('hello from %s!' % self.context)

  When the bfg_view decorator is used against a class method, a view is registered for the class (it’s a “class view” where the “attr” happens to be the name of the method it is attached to), so the class it’s defined within must have a suitable constructor: one that accepts context, request or just request.

Documentation

• Added Changing the Traverser and Changing How :mod:`repoze.bfg.url.model_url` Generates a URL to the “Hooks” narrative chapter of the docs.

Internal

• Remove ez_setup.py and imports of it within setup.py. In the new world, and as per virtualenv setup instructions, people will already have either setuptools or distribute.

1.1a6 (2009-10-15)

Features

• Add xhr, accept, and header view configuration predicates to ZCML view declaration, ZCML route declaration, and bfg_view decorator. See the Views narrative documentation chapter for more information about these predicates.

• Add setUp and tearDown functions to the repoze.bfg.testing module. Using setUp in a test setup and tearDown in a test teardown is now the recommended way to do component registry setup and teardown. Previously, it was recommended that a single function named repoze.bfg.testing.cleanUp be called in both the test setup and tear down. repoze.bfg.testing.cleanUp still exists (and will exist “forever” due to its widespread use); it is now just an alias for repoze.bfg.testing.setUp and is nominally deprecated.

• The BFG component registry is now available in view and event subscriber code as an attribute of the request ie. request.registry. This fact is currently undocumented except for this note, because BFG developers never need to interact with the registry directly anywhere else.

• The BFG component registry now inherits from dict, meaning that it can optionally be used as a simple dictionary. Component registrations performed against it via e.g. registerUtility, registerAdapter, and similar API methods are kept in a completely separate namespace than its dict members, so using the its component API methods won’t effect the keys and values in the dictionary namespace. Likewise, though the component registry “happens to be” a dictionary, use of mutating dictionary methods such as __setitem__ will have no influence on any component registrations made against it. In other words, the registry object you obtain via e.g. repoze.bfg.threadlocal.get_current_registry or request.registry happens to be both a component registry and a dictionary, but using its component-registry API won’t impact data added to it via its dictionary API and vice versa. This is a forward compatibility move based on the goals of “marco”.

• Expose and document repoze.bfg.testing.zcml_configure API. This function populates a component registry from a ZCML file for testing purposes. It is documented in the “Unit and Integration Testing” chapter.

Documentation

• Virtual hosting narrative docs chapter updated with info about mod_wsgi.

• Point all index URLs at the literal 1.1 index (this alpha cycle may go on a while).

• Various tutorial test modules updated to use repoze.bfg.testing.setUp and repoze.bfg.testing.tearDown methods in order to encourage this as best practice going forward.

• Added “Creating Integration Tests” section to unit testing narrative documentation chapter. As a result, the name of the unittesting chapter is now “Unit and Integration Testing”.

Backwards Incompatibilities

• Importing getSiteManager and get_registry from repoze.bfg.registry is no longer supported. These imports were deprecated in repoze.bfg 1.0. Import of getSiteManager should be done as from zope.component import getSiteManager. Import of get_registry should be done as from repoze.bfg.threadlocal import get_current_registry. This was done to prevent a circular import dependency.

• Code bases which alternately invoke both zope.testing.cleanup.cleanUp and repoze.bfg.testing.cleanUp (treating them equivalently, using them interchangeably) in the setUp/tearDown of unit tests will begin to experience test failures due to lack of test isolation. The “right” mechanism is repoze.bfg.testing.cleanUp (or the combination of repoze.bfg.testing.setUp and repoze.bfg.testing.tearDown). but a good number of legacy codebases will use zope.testing.cleanup.cleanUp instead. We support zope.testing.cleanup.cleanUp but not in combination with repoze.bfg.testing.cleanUp in the same codebase. You should use one or the other test cleanup function in a single codebase, but not both.

Internal

• Created new repoze.bfg.configuration module which assumes responsibilities previously held by the repoze.bfg.registry and repoze.bfg.router modules (avoid a circular import dependency).

• The result of the zope.component.getSiteManager function in unit tests set up with repoze.bfg.testing.cleanUp or repoze.bfg.testing.setUp will be an instance of repoze.bfg.registry.Registry instead of the global zope.component.globalregistry.base registry. This also means that the threadlocal ZCA API functions such as getAdapter and getUtility as well as internal BFG machinery (such as model_url and route_url) will consult this registry within unit tests. This is a forward compatibility move based on the goals of “marco”.

• Removed repoze.bfg.testing.addCleanUp function and associated module-scope globals. This was never an API.

1.1a5 (2009-10-10)

Documentation

• Change “Traversal + ZODB” and “URL Dispatch + SQLAlchemy” Wiki tutorials to make use of the new-to-1.1 “renderer” feature (return dictionaries from all views).

• Add tests to the “URL Dispatch + SQLAlchemy” tutorial after the “view” step.

• Added a diagram of model graph traversal to the “Traversal” narrative chapter of the documentation.

• An exceptions API chapter was added, documenting the new repoze.bfg.exceptions module.

• Describe “request-only” view calling conventions inside the urldispatch narrative chapter, where it’s most helpful.

• Add a diagram which explains the operation of the BFG router to the “Router” narrative chapter.

Features

• Add a new repoze.bfg.testing API: registerRoute, for registering routes to satisfy calls to e.g. repoze.bfg.url.route_url in unit tests.

• The notfound and forbidden ZCML directives now accept the following addtional attributes: attr, renderer, and wrapper. These have the same meaning as they do in the context of a ZCML view directive.

• For behavior like Django’s APPEND_SLASH=True, use the repoze.bfg.view.append_slash_notfound_view view as the Not Found view in your application. When this view is the Not Found view (indicating that no view was found), and any routes have been defined in the configuration of your application, if the value of PATH_INFO does not already end in a slash, and if the value of PATH_INFO plus a slash matches any route’s path, do an HTTP redirect to the slash-appended PATH_INFO. Note that this will lose POST data information (turning it into a GET), so you shouldn’t rely on this to redirect POST requests.

• Speed up repoze.bfg.location.lineage slightly.

• Speed up repoze.bfg.encode.urlencode (nee’ repoze.bfg.url.urlencode) slightly.

• Speed up repoze.bfg.traversal.model_path.

• Speed up repoze.bfg.traversal.model_path_tuple slightly.

• Speed up repoze.bfg.traversal.traverse slightly.

• Speed up repoze.bfg.url.model_url slightly.

• Speed up repoze.bfg.url.route_url slightly.

• Sped up repoze.bfg.traversal.ModelGraphTraverser:__call__ slightly.

• Minor speedup of repoze.bfg.router.Router.__call__.

• New repoze.bfg.exceptions module was created to house exceptions that were previously sprinkled through various modules.

Internal

• Move repoze.bfg.traversal._url_quote into repoze.bfg.encode as url_quote.

Deprecations

• The import of repoze.bfg.view.NotFound is deprecated in favor of repoze.bfg.exceptions.NotFound. The old location still functions, but emits a deprecation warning.

• The import of repoze.bfg.security.Unauthorized is deprecated in favor of repoze.bfg.exceptions.Forbidden. The old location still functions but emits a deprecation warning. The rename from Unauthorized to Forbidden brings parity to the the name of the exception and the system view it invokes when raised.

Backwards Incompatibilities

• We previously had a Unicode-aware wrapper for the urllib.urlencode function named repoze.bfg.url.urlencode which delegated to the stdlib function, but which marshalled all unicode values to utf-8 strings before calling the stdlib version. A newer replacement now lives in repoze.bfg.encode The replacement does not delegate to the stdlib.

  The replacement diverges from the stdlib implementation and the previous repoze.bfg.url url implementation inasmuch as its doseq argument is now a decoy: it always behaves in the doseq=True way (which is the only sane behavior) for speed purposes.

  The old import location (repoze.bfg.url.urlencode) still functions and has not been deprecated.

• In 0.8a7, the return value expected from an object implementing ITraverserFactory was changed from a sequence of values to a dictionary containing the keys context, view_name, subpath, traversed, virtual_root, virtual_root_path, and root. Until now, old-style traversers which returned a sequence have continued to work but have generated a deprecation warning. In this release, traversers which return a sequence instead of a dictionary will no longer work.

1.1a4 (2009-09-23)

Bug Fixes

• On 64-bit Linux systems, views that were members of a multiview (orderings of views with predicates) were not evaluated in the proper order. Symptom: in a configuration that had two views with the same name but one with a request_method=POST predicate and one without, the one without the predicate would be called unconditionally (even if the request was a POST request). Thanks much to Sebastien Douche for providing the buildbots that pointed this out.

Documentation

• Added a tutorial which explains how to use repoze.session (ZODB-based sessions) in a ZODB-based repoze.bfg app.

• Added a tutorial which explains how to add ZEO to a ZODB-based repoze.bfg application.

• Added a tutorial which explains how to run a repoze.bfg application under mod_wsgi. See “Running a repoze.bfg Application under mod_wsgi” in the tutorials section of the documentation.

Features

• Add a repoze.bfg.url.static_url API which is capable of generating URLs to static resources defined by the <static> ZCML directive. See the “Views” narrative chapter’s section titled “Generating Static Resource URLs” for more information.

• Add a string renderer. This renderer converts a non-Response return value of any view callble into a string. It is documented in the “Views” narrative chapter.

• Give the route ZCML directive the view_attr and view_renderer parameters (bring up to speed with 1.1a3 features). These can also be spelled as attr and renderer.

Backwards Incompatibilities

• An object implementing the IRenderer interface (and ITemplateRenderer`, which is a subclass of ``IRenderer) must now accept an extra system argument in its __call__ method implementation. Values computed by the system (as opposed to by the view) are passed by the system in the system parameter, which will always be a dictionary. Keys in the dictionary include: view (the view object that returned the value), renderer_name (the template name or simple name of the renderer), context (the context object passed to the view), and request (the request object passed to the view). Previously only ITemplateRenderers received system arguments as elements inside the main value dictionary.

Internal

• The way bfg_view declarations are scanned for has been modified. This should have no external effects.

• Speed: do not register an ITraverserFactory in configure.zcml; instead rely on queryAdapter and a manual default to ModelGraphTraverser.

• Speed: do not register an IContextURL in configure.zcml; instead rely on queryAdapter and a manual default to TraversalContextURL.

• General speed microimprovements for helloworld benchmark: replace try/excepts with statements which use ‘in’ keyword.

1.1a3 (2009-09-16)

Documentation

• The “Views” narrative chapter in the documentation has been updated extensively to discuss “renderers”.

Features

• A renderer attribute has been added to view configurations, replacing the previous (1.1a2) version’s template attribute. A “renderer” is an object which accepts the return value of a view and converts it to a string. This includes, but is not limited to, templating systems.

• A new interface named IRenderer was added. The existing interface, ITemplateRenderer now derives from this new interface. This interface is internal.

• A new interface named IRendererFactory was added. An existing interface named ITemplateRendererFactory now derives from this interface. This interface is internal.

• The view attribute of the view ZCML directive is no longer required if the ZCML directive also has a renderer attribute. This is useful when the renderer is a template renderer and no names need be passed to the template at render time.

• A new zcml directive renderer has been added. It is documented in the “Views” narrative chapter of the documentation.

• A ZCML view directive (and the associated bfg_view decorator) can now accept a “wrapper” value. If a “wrapper” value is supplied, it is the value of a separate view’s name attribute. When a view with a wrapper attribute is rendered, the “inner” view is first rendered normally. Its body is then attached to the request as “wrapped_body”, and then a wrapper view name is looked up and rendered (using repoze.bfg.render_view_to_response), passed the request and the context. The wrapper view is assumed to do something sensible with request.wrapped_body, usually inserting its structure into some other rendered template. This feature makes it possible to specify (potentially nested) “owrap” relationships between views using only ZCML or decorators (as opposed always using ZPT METAL and analogues to wrap view renderings in outer wrappers).

Dependencies

• When used under Python < 2.6, BFG now has an installation time dependency on the simplejson package.

Deprecations

• The repoze.bfg.testing.registerDummyRenderer API has been deprecated in favor of repoze.bfg.testing.registerTemplateRenderer. A deprecation warning is not issued at import time for the former name; it will exist “forever”; its existence has been removed from the documentation, however.

• The repoze.bfg.templating.renderer_from_cache function has been moved to repoze.bfg.renderer.template_renderer_factory. This was never an API, but code in the wild was spotted that used it. A deprecation warning is issued at import time for the former.

Backwards Incompatibilities

• The ITemplateRenderer interface has been changed. Previously its __call__ method accepted **kw. It now accepts a single positional parameter named kw (REVISED: it accepts two positional parameters as of 1.1a4: value and system). This is mostly an internal change, but it was exposed in APIs in one place: if you’ve used the repoze.bfg.testing.registerDummyRenderer API in your tests with a custom “renderer” argument with your own renderer implementation, you will need to change that renderer implementation to accept kw instead of **kw in its __call__ method (REVISED: make it accept value and system positional arguments as of 1.1a4).

• The ITemplateRendererFactory interface has been changed. Previously its __call__ method accepted an auto_reload keyword parameter. Now its __call__ method accepts no keyword parameters. Renderers are now themselves responsible for determining details of auto-reload. This is purely an internal change. This interface was never external.

• The template_renderer ZCML directive introduced in 1.1a2 has been removed. It has been replaced by the renderer directive.

• The previous release (1.1a2) added a view configuration attribute named template. In this release, the attribute has been renamed to renderer. This signifies that the attribute is more generic: it can now be not just a template name but any renderer name (ala json).

• In the previous release (1.1a2), the Chameleon text template renderer was used if the system didn’t associate the template view configuration value with a filename with a “known” extension. In this release, you must use a renderer attribute which is a path that ends with a .txt extension (e.g. templates/foo.txt) to use the Chameleon text renderer.

1.1a2 (2009-09-14)

Features

• A ZCML view directive (and the associated bfg_view decorator) can now accept an “attr” value. If an “attr” value is supplied, it is considered a method named of the view object to be called when the response is required. This is typically only good for views that are classes or instances (not so useful for functions, as functions typically have no methods other than __call__).

• A ZCML view directive (and the associated bfg_view decorator) can now accept a “template” value. If a “template” value is supplied, and the view callable returns a dictionary, the associated template is rendered with the dictionary as keyword arguments. See the section named “Views That Have a template” in the “Views” narrative documentation chapter for more information.

1.1a1 (2009-09-06)

Bug Fixes

• “tests” module removed from the bfg_alchemy paster template; these tests didn’t work.

• Bugfix: the discriminator for the ZCML “route” directive was incorrect. It was possible to register two routes that collided without the system spitting out a ConfigurationConflictError at startup time.

Features

• Feature addition: view predicates. These are exposed as the request_method, request_param, and containment attributes of a ZCML view declaration, or the respective arguments to a @bfg_view decorator. View predicates can be used to register a view for a more precise set of environment parameters than was previously possible. For example, you can register two views with the same name with different request_param attributes. If the request.params dict contains ‘foo’ (request_param=”foo”), one view might be called; if it contains ‘bar’ (request_param=”bar”), another view might be called. request_param can also name a key/value pair ala foo=123. This will match only when the foo key is in the request.params dict and it has the value ‘123’. This particular example makes it possible to write separate view functions for different form submissions. The other predicates, containment and request_method work similarly. containment is a view predicate that will match only when the context’s graph lineage has an object possessing a particular class or interface, for example. request_method is a view predicate that will match when the HTTP REQUEST_METHOD equals some string (eg. ‘POST’).

• The @bfg_view decorator now accepts three additional arguments: request_method, request_param, and containment. request_method is used when you’d like the view to match only a request with a particular HTTP REQUEST_METHOD; a string naming the REQUEST_METHOD can also be supplied as request_type for backwards compatibility. request_param is used when you’d like a view to match only a request that contains a particular request.params key (with or without a value). containment is used when you’d like to match a request that has a context that has some class or interface in its graph lineage. These are collectively known as “view predicates”.

• The route ZCML directive now honors view_request_method, view_request_param and view_containment attributes, which pass along these values to the associated view if any is provided. Additionally, the request_type attribute can now be spelled as view_request_type, and permission can be spelled as view_permission. Any attribute which starts with view_ can now be spelled without the view_ prefix, so view_for can be spelled as for now, etc. Both forms are documented in the urldispatch narraitve documentation chapter.

• The request_param ZCML view directive attribute (and its bfg_view decorator cousin) can now specify both a key and a value. For example, request_param="foo=123" means that the foo key must have a value of 123 for the view to “match”.

• Allow repoze.bfg.traversal.find_interface API to use a class object as the argument to compare against the model passed in. This means you can now do find_interface(model, SomeClass) and the first object which is found in the lineage which has SomeClass as its class (or the first object found which has SomeClass as any of its superclasses) will be returned.

• Added static ZCML directive which registers a route for a view that serves up files in a directory. See the “Views” narrative documentation chapter’s “Serving Static Resources Using a ZCML Directive” section for more information.

• The repoze.bfg.view.static class now accepts a string as its first argument (“root_dir”) that represents a package-relative name e.g. somepackage:foo/bar/static. This is now the preferred mechanism for spelling package-relative static paths using this class. A package_name keyword argument has been left around for backwards compatibility. If it is supplied, it will be honored.

• The API repoze.bfg.testing.registerView now takes a permission argument. Use this instead of using repoze.bfg.testing.registerViewPermission.

• The ordering of route declarations vs. the ordering of view declarations that use a “route_name” in ZCML no longer matters. Previously it had been impossible to use a route_name from a route that had not yet been defined in ZCML (order-wise) within a “view” declaration.

• The repoze.bfg router now catches both repoze.bfg.security.Unauthorized and repoze.bfg.view.NotFound exceptions while rendering a view. When the router catches an Unauthorized, it returns the registered forbidden view. When the router catches a NotFound, it returns the registered notfound view.

Internal

• Change urldispatch internals: Route object is now constructed using a path, a name, and a factory instead of a name, a matcher, a generator, and a factory.

• Move (non-API) default_view, default_forbidden_view, and default_notfound_view functions into the repoze.bfg.view module (moved from repoze.bfg.router).

• Removed ViewPermissionFactory from repoze.bfg.security. View permission checking is now done by registering and looking up an ISecuredView.

• The static ZCML directive now uses a custom root factory when constructing a route.

• The interface IRequestFactories was removed from the repoze.bfg.interfaces module. This interface was never an API.

• The function named named_request_factories and the data structure named DEFAULT_REQUEST_FACTORIES have been removed from the repoze.bfg.request module. These were never APIs.

• The IViewPermissionFactory interface has been removed. This was never an API.

Documentation

• Request-only-convention examples in the “Views” narrative documentation were broken.

• Fixed documentation bugs related to forget and remember in security API docs.

• Fixed documentation for repoze.bfg.view.static (in narrative Views chapter).

Deprecations

• The API repoze.bfg.testing.registerViewPermission has been deprecated.

Backwards Incompatibilities

• The interfaces IPOSTRequest, IGETRequest, IPUTRequest, IDELETERequest, and IHEADRequest have been removed from the repoze.bfg.interfaces module. These were not documented as APIs post-1.0. Instead of using one of these, use a request_method ZCML attribute or request_method bfg_view decorator parameter containing an HTTP method name (one of GET, POST, HEAD, PUT, DELETE) instead of one of these interfaces if you were using one explicitly. Passing a string in the set (GET, HEAD, PUT, POST, DELETE) as a request_type argument will work too. Rationale: instead of relying on interfaces attached to the request object, BFG now uses a “view predicate” to determine the request type.

• Views registered without the help of the ZCML view directive are now responsible for performing their own authorization checking.

• The registry_manager backwards compatibility alias importable from “repoze.bfg.registry”, deprecated since repoze.bfg 0.9 has been removed. If you are tring to use the registry manager within a debug script of your own, use a combination of the “repoze.bfg.paster.get_app” and “repoze.bfg.scripting.get_root” APIs instead.

• The INotFoundAppFactory interface has been removed; it has been deprecated since repoze.bfg 0.9. If you have something like the following in your configure.zcml:

  <utility provides="repoze.bfg.interfaces.INotFoundAppFactory"
           component="helloworld.factories.notfound_app_factory"/>

  Replace it with something like:

  <notfound
      view="helloworld.views.notfound_view"/>

  See “Changing the Not Found View” in the “Hooks” chapter of the documentation for more information.

• The IUnauthorizedAppFactory interface has been removed; it has been deprecated since repoze.bfg 0.9. If you have something like the following in your configure.zcml:

  <utility provides="repoze.bfg.interfaces.IUnauthorizedAppFactory"
           component="helloworld.factories.unauthorized_app_factory"/>

  Replace it with something like:

  <forbidden
      view="helloworld.views.forbidden_view"/>

  See “Changing the Forbidden View” in the “Hooks” chapter of the documentation for more information.

• ISecurityPolicy-based security policies, deprecated since repoze.bfg 0.9, have been removed. If you have something like this in your configure.zcml, it will no longer work:

  <utility
    provides="repoze.bfg.interfaces.ISecurityPolicy"
    factory="repoze.bfg.security.RemoteUserInheritingACLSecurityPolicy"
    />
  
  If ZCML like the above exists in your application, you will receive
  an error at startup time.  Instead of the above, you'll need
  something like::
  
    <remoteuserauthenticationpolicy/>
    <aclauthorizationpolicy/>
  
  This is just an example.  See the "Security" chapter of the
  repoze.bfg documentation for more information about configuring
  security policies.

• Custom ZCML directives which register an authentication or authorization policy (ala “authtktauthenticationpolicy” or “aclauthorizationpolicy”) should register the policy “eagerly” in the ZCML directive instead of from within a ZCML action. If an authentication or authorization policy is not found in the component registry by the view machinery during deferred ZCML processing, view security will not work as expected.