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removed, as well as its documentation. It had been deprecated since
0.6.3. Code in ``repoze.bfg.urldispatch.RoutesModelTraverser``
which catered to it has also been removed.
- The semantics of the ``route`` ZCML directive have been simplified.
Previously, it was assumed that to use a route, you wanted to map a
route to an externally registered view. The new ``route`` directive
instead has a ``view`` attribute which is required, specifying the
dotted path to a view callable. When a route directive is
processed, a view is *registered* using the name attribute of the
route directive as its name and the callable as its value. The
``view_name`` and ``provides`` attributes of the ``route`` directive
are therefore no longer used. Effectively, if you were previously
using the ``route`` directive, it means you must change a pair of
ZCML directives that look like this::
<route
name="home"
path=""
view_name="login"
factory=".models.root.Root"
/>
<view
for=".models.root.Root"
name="login"
view=".views.login_view"
/>
To a ZCML directive that looks like this::
<route
name="home"
path=""
view=".views.login_view"
factory=".models.root.Root"
/>
In other words, to make old code work, remove the ``view``
directives that were only there to serve the purpose of backing
``route`` directives, and move their ``view=`` attribute into the
``route`` directive itself.
This change also necessitated that the ``name`` attribute of the
``route`` directive is now required. If you were previously using
``route`` directives without a ``name`` attribute, you'll need to
add one (the name is arbitrary, but must be unique among all
``route`` and ``view`` statements).
The ``provides`` attribute of the ``route`` directive has also been
removed. This directive specified a sequence of interface types
that the generated context would be decorated with. Since route
views are always generated now for a single interface
(``repoze.bfg.IRoutesContext``) as opposed to being looked up
arbitrarily, there is no need to decorate any context to ensure a
view is found.
- The Routes ``Route`` object used to resolve the match is now put
into the environment as ``bfg.route`` when URL dispatch is used.
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--------
- Two new security policies were added:
RemoteUserInheritingACLSecurityPolicy and
WhoInheritingACLSecurityPolicy. These are security policies which
take into account *all* ACLs defined in the lineage of a context
rather than stopping at the first ACL found in a lineage. See the
"Security" chapter of the API documentation for more information.
- The API and narrative documentation dealing with security was
changed to introduce the new "inheriting" security policy variants.
- Added glossary entry for "lineage".
Deprecations
------------
- The security policy previously named
``RepozeWhoIdentityACLSecurityPolicy`` now has the slightly saner
name of ``WhoACLSecurityPolicy``. A deprecation warning is emitted
when this policy is imported under the "old" name; usually this is
due to its use in ZCML within your application. If you're getting
this deprecation warning, change your ZCML to use the new name,
e.g. change::
<utility
provides="repoze.bfg.interfaces.ISecurityPolicy"
factory="repoze.bfg.security.RepozeWhoIdentityACLSecurityPolicy"
/>
To::
<utility
provides="repoze.bfg.interfaces.ISecurityPolicy"
factory="repoze.bfg.security.WhoACLSecurityPolicy"
/>
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and cleanUp functions in repoze.bfg.testing. Our dependencies still rely on zope.testing, however.
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``repoze.bfg.traversal.model_path`` and
``repoze.bfg.traversal.model_path_tuple`` functions always ignored
the ``__name__`` argument of the root object in a model graph (
effectively replacing it with a leading ``/`` in the returned value)
when a path or URL was generated. The code required to perform this
operation was not efficient. As of this release, the root object in
a model graph *must* have a ``__name__`` attribute that is either
``None`` or the empty string (``''``) for URLs and paths to be
generated properly from these APIs. If your root model object has a
``__name__`` argument that is not one of these values, you will need
to change your code for URLs and paths to be generated properly. If
your model graph has a root node with a string ``__name__`` that is
not null, the value of ``__name__`` will be prepended to every path
and URL generated.
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``repoze.bfg.location.ClassAndInstanceDescr`` class have both been
removed in order to be able to eventually shed a dependency on
``zope.proxy``. Neither of these classes was ever an API.
- In all previous releases, the ``repoze.bfg.location.locate``
function worked like so: if a model did not explicitly provide the
``repoze.bfg.interfaces.ILocation`` interface, ``locate`` returned a
``LocationProxy`` object representing ``model`` with its
``__parent__`` attribute assigned to ``parent`` and a ``__name__``
attribute assigned to ``__name__``. In this release, the
``repoze.bfg.location.locate`` function simply jams the ``__name__``
and ``__parent__`` attributes on to the supplied model
unconditionally, no matter if the object implements ILocation or
not, and it never returns a proxy. This was done because the
LocationProxy behavior has now moved into an add-on package
(``repoze.bfg.traversalwrapper``), in order to eventually be able to
shed a dependency on ``zope.proxy``.
- In all previous releases, by default, if traversal was used (as
opposed to URL-dispatch), and the root object supplied
the``repoze.bfg.interfaces.ILocation`` interface, but the children
returned via its ``__getitem__`` returned an object that did not
implement the same interface, :mod:`repoze.bfg` provided some
implicit help during traversal. This traversal feature wrapped
subobjects from the root (and thereafter) that did not implement
``ILocation`` in proxies which automatically provided them with a
``__name__`` and ``__parent__`` attribute based on the name being
traversed and the previous object traversed. This feature has now
been removed from the base ``repoze.bfg`` package for purposes of
eventually shedding a dependency on ``zope.proxy``.
In order to re-enable the wrapper behavior for older applications
which cannot be changed, register the "traversalwrapper"
``ModelGraphTraverser`` as the traversal policy, rather than the
default ``ModelGraphTraverser``. To use this feature, you will need
to install the ``repoze.bfg.traversalwrapper`` package (an add-on
package, available at
http://svn.repoze.org/repoze.bfg.traversalwrapper) Then change your
application's ``configure.zcml`` to include the following stanza:
<adapter
factory="repoze.bfg.traversalwrapper.ModelGraphTraverser"
provides="repoze.bfg.interfaces.ITraverserFactory"
for="*"
/>
When this ITraverserFactory is used instead of the default, no
object in the graph (even the root object) must supply a
``__name__`` or ``__parent__`` attribute. Even if subobjects
returned from the root *do* implement the ILocation interface,
these will still be wrapped in proxies that override the object's
"real" ``__parent__`` and ``__name__`` attributes.
See also changes to the "Models" chapter of the documentation (in
the "Location-Aware Model Instances") section.
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ILocation. Make WrappingModelGraphTraverser assume that *no* traversed objects provide ILocation. This makes it unnecessary to explain why the root object in a WrappingModelGraphTraverser setup needs to supply the ILocation interface. Now it doesn't.
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built-in implementations that implement the interface
(``repoze.bfg.traversal.ModelGraphTraverser``, and
``repoze.bfg.urldispatch.RoutesModelTraverser``) now expect the
``__call__`` method of an ITraverser to return 3 additional
arguments: ``traversed``, ``virtual_root``, and
``virtual_root_path`` (the old contract was that the ``__call__``
method of an ITraverser returned; three arguments, the contract new
is that it returns six). ``traversed`` will be a sequence of
Unicode names that were traversed (including the virtual root path,
if any) or ``None`` if no traversal was performed, ``virtual_root``
will be a model object representing the virtual root (or the
physical root if traversal was not performed), and
``virtual_root_path`` will be a sequence representing the virtual
root path (a sequence of Unicode names) or ``None`` if traversal was
not performed.
Six arguments are now returned from BFG ITraversers. They are
returned in this order: ``context``, ``view_name``, ``subpath``,
``traversed``, ``virtual_root``, and ``virtual_root_path``.
Places in the BFG code which called an ITraverser continue to accept
a 3-argument return value, although BFG will generate and log a
warning when one is encountered.
- The request object now has the following attributes: ``traversed``
(the sequence of names traversed or ``None`` if traversal was not
performed), ``virtual_root`` (the model object representing the
virtual root, including the virtual root path if any), and
``virtual_root_path`` (the seuquence of names representing the
virtual root path or ``None`` if traversal was not performed).
- A new decorator named ``wsgiapp2`` was added to the
``repoze.bfg.wsgi`` module. This decorator performs the same
function as ``repoze.bfg.wsgi.wsgiapp`` except it fixes up the
``SCRIPT_NAME``, and ``PATH_INFO`` environment values before
invoking the WSGI subapplication.
- The ``repoze.bfg.testing.DummyRequest`` object now has default
attributes for ``traversed``, ``virtual_root``, and
``virtual_root_path``.
- The RoutesModelTraverser now behaves more like the Routes
"RoutesMiddleware" object when an element in the match dict is named
``path_info`` (usually when there's a pattern like
``http://foo/*path_info``). When this is the case, the
``PATH_INFO`` environment variable is set to the value in the match
dict, and the ``SCRIPT_NAME`` is appended to with the prefix of the
original ``PATH_INFO`` not including the value of the new variable.
- The notfound debug now shows the traversed path, the virtual root,
and the virtual root path too.
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``GET``, and ``POST`` attributes that are instances of the class
``FauxMultiDict``. A FauxMultiDict differs from a "plain"
dictionary inasmuch as it has a ``getall`` method. ``getall`` is an
interface exposed by the MultiDict implementation used by WebOb for
``params``, ``GET``, and ``POST``.
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the request machinery will attempt to decode values from the utf-8
encoding to Unicode automatically when they are obtained via
``request.params``, ``request.GET``, and ``request.POST``. The
previous behavior of BFG was to return a bytestring when a value was
accessed in this manner. This change will break form handling code
in apps that rely on values from those APIs being considered
bytestrings. If you are manually decoding values from form
submissions in your application, you'll either need to change the
code that does that to expect Unicode values from
``request.params``, ``request.GET`` and ``request.POST``, or you'll
need to explicitly reenable the previous behavior. To reenable the
previous behavior, add the following to your application's
``configure.zcml``::
<subscriber for="repoze.bfg.interfaces.INewRequest"
handler="repoze.bfg.request.make_request_ascii"/>
See also the documentation in the "Views" chapter of the BFG docs
entitled "Using Views to Handle Form Submissions (Unicode and
Character Set Issues)".
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was returned as an int rather than as a string.
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some nondefault string representation.
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(one with models that had a non-root model with a ``__name__`` of
``None``) caused an inscrutable error to be thrown: ( if not
``_must_quote[cachekey].search(s): TypeError: expected string or
buffer``). Now URLs and paths generated against graphs that have
None names in intermediate nodes will replace the None with the
empty string, and, as a result, the error won't be raised. Of
course the URL or path will still be bogus.
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---------
- Empty location names in model paths when generating a URL using
``repoze.bfg.model_url`` based on a model obtained via traversal are
no longer ignored in the generated URL. This means that if a
non-root model object has a ``__name__`` of ``''``, the URL will
reflect it (e.g. ``model_url`` will generate ``http://foo/bar//baz``
if an object with the ``__name__`` of ``''`` is a child of bar and
the parent of baz). URLs generated with empty path segments are,
however, still irresolveable by the model graph traverser on request
ingress (the traverser strips empty path segment names).
Features
--------
- Microspeedups of ``repoze.bfg.traversal.model_path``,
``repoze.bfg.traversal.model_path_tuple``,
and ``repoze.bfg.url.urlencode``.
Documentation
-------------
- Add a note to the ``repoze.bfg.traversal.quote_path_segment`` API
docs about caching of computed values.
Implementation Changes
----------------------
- Simplification of
``repoze.bfg.traversal.TraversalContextURL.__call__`` (it now uses
``repoze.bfg.traversal.model_path`` instead of rolling its own
path-generation).
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now still returns a string; albeit a quoted one. An additional API
(model_path_tuple) now also exists which can be used to get a model
path as a tuple.
- The ``repoze.bfg.traversal.model_path`` API now returns a *quoted*
string rather than a string represented by series of unquoted
elements joined via ``/`` characters. Previously it returned a
string or unicode object representing the model path, with each
segment name in the path joined together via ``/`` characters,
e.g. ``/foo /bar``. Now it returns a string, where each segment is
a UTF-8 encoded and URL-quoted element e.g. ``/foo%20/bar``. This
change was (as discussed briefly on the repoze-dev maillist)
necessary to accomodate model objects which themselves have
``__name__`` attributes that contain the ``/`` character.
For people that have no models that have high-order Unicode
``__name__`` attributes or ``__name__`` attributes with values that
require URL-quoting with in their model graphs, this won't cause any
issue. However, if you have code that currently expects
``model_path`` to return an unquoted string, or you have an existing
application with data generated via the old method, and you're too
lazy to change anything, you may wish replace the BFG-imported
``model_path`` in your code with this function (this is the code of
the "old" ``model_path`` implementation)::
from repoze.bfg.location import lineage
def i_am_too_lazy_to_move_to_the_new_model_path(model, *elements):
rpath = []
for location in lineage(model):
if location.__name__:
rpath.append(location.__name__)
path = '/' + '/'.join(reversed(rpath))
if elements:
suffix = '/'.join(elements)
path = '/'.join([path, suffix])
return path
- The ``repoze.bfg.traversal.find_model`` API no longer implicitly
converts unicode representations of a full path passed to it as a
Unicode object into a UTF-8 string. Callers should either use
prequoted path strings returned by
``repoze.bfg.traversal.model_path``, or tuple values returned by the
result of ``repoze.bfg.traversal.model_path_tuple`` or they should
use the guidelines about passing a string ``path`` argument
described in the ``find_model`` API documentation.
- Each argument contained in ``elements`` passed to
``repoze.bfg.traversal.model_path`` will now have any ``/``
characters contained within quoted to ``%2F`` in the returned
string. Previously, ``/`` characters in elements were left unquoted
(a bug).
- A ``repoze.bfg.traversal.model_path_tuple`` API was added. This API
is an alternative to ``model_path`` (which returns a string);
``model_path_tuple`` returns a model path as a tuple (much like
Zope's ``getPhysicalPath``).
- A ``repoze.bfg.traversal.quote_path_segment`` API was added. This
API will quote an individual path segment (string or unicode
object). See the ``repoze.bfg.traversal`` API documentation for
more information.
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---------------------------
- The ``repoze.bfg.traversal.model_path`` API now returns a tuple
instead of a string. Previously it returned a string representing
the model path, with each segment name in the path joined together
via ``/`` characters, e.g. ``/foo/bar``. Now it returns a tuple,
where each segment is an element in the tuple e.g. ``('', 'foo',
'bar')`` (the leading empty element indicates that this path is
absolute). This change was (as discussed on the repoze-dev
maillist) necessary to accomodate model objects which themselves
have names that contain the ``/`` character. See the API
documentation for ``repoze.bfg.traversal.model_path`` for more
information.
- The ``repoze.bfg.traversal.find_model`` API no longer implicitly
converts unicode path representations into a UTF-8 string. Callers
should either use path tuples or use the guidelines about passing a
string ``path`` argument described in its API documentation.
Features
--------
- The ``find_model`` API now accepts "path tuples" (see the above note
regarding ``model_path``) as well as string path representations as
a ``path`` argument.
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``repoze.bfg.testing.registerDummyRenderer``. This makes it
possible, for instance, to register a custom renderer that raises an
exception in a unit test.
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--------
- The ``repoze.bfg.url.model_url`` API now works against contexts
derived from Routes URL dispatch (``Routes.util.url_for`` is called
under the hood).
- "Virtual root" support for traversal-based applications has been
added. Virtual root support is useful when you'd like to host some
model in a :mod:`repoze.bfg` model graph as an application under a
URL pathname that does not include the model path itself. For more
information, see the (new) "Virtual Hosting" chapter in the
documentation.
- A ``repoze.bfg.traversal.virtual_root`` API has been added. When
called, it returns the virtual root object (or the physical root
object if no virtual root has been specified).
Implementation Changes
----------------------
- ``repoze.bfg.traversal.RoutesModelTraverser`` has been moved to
``repoze.bfg.urldispatch``.
- ``model_url`` URL generation is now performed via an adapter lookup
based on the context and the request.
- ZCML which registers two adapters for the ``IContextURL`` interface
has been added to the configure.zcml in ``repoze.bfg.includes``.
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consults a utility to generate the base model url (without extra
elements or a query string). Eventually this will service virtual
hosting; for now it's undocumented and should not be hooked.
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"traversal" API chapter in the docs. This was a function previously
known as ``split_path`` that was not an API but people were using it
anyway. Unlike ``split_path`` it now returns a tuple instead of a
list (as its values are cached).
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were baffled when they mutated the value.
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``wsgiorg.routing_args`` environment variable into the environ when
a route matches. This is a tuple of ((), routing_args) where
routing_args is the value that comes back from the routes mapper
match (the "match dict").
- The ``repoze.bfg.traversal.RoutesModelTraverser`` class now wants to
obtain the ``view_name`` and ``subpath`` from the
``wsgiorgs.routing_args`` environment variable. It falls back to
obtaining these from the context for backwards compatibility.
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list of permissions (e.g. ``(Allow, Everyone, ['read', ['view',
['write', 'manage']]])`)`. The list must instead be fully expanded
(e.g. ``(Allow, Everyone, ['read', 'view', 'write', 'manage])``). This
feature was never documented, and was never an API, so it's not a
backwards incompatibility.
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``ACLSecurityPolicy`` now does what it did inline.
- Get rid of ``repoze.bfg.interfaces.NoAuthorizationInformation``
exception: it was used only by ``ACLAuthorizer``.
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``repoze.bfg.ACLAuthorizer.permits`` (e.g. ['fred', ['larry',
'bob']). The principals list must be fully expanded. This feature
was never documented, and was never an API, so it's not a backwards
incompatibility.
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----------------
- The ``repoze.bfg.view.render_view_to_response`` API will no longer
raise a ValueError if an object returned by a view function it calls
does not possess certain attributes (``headerlist``, ``app_iter``,
``status``). This API used to attempt to perform a check using the
``is_response`` function in ``repoze.bfg.view``, and raised a
``ValueError`` if the ``is_response`` check failed. The
responsibility is now the caller's to ensure that the return value
from a view function is a "real" response.
- WSGI environ dicts passed to ``repoze.bfg`` 's Router must now
contain a REQUEST_METHOD key/value; if they do not, a KeyError will
be raised (speed).
Implementation Changes
----------------------
- Various speed micro-tweaks.
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it now does.
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path segments to unicode (for speed, because its results are
LRU cached).
- ``repoze.bfg.traversal.step`` was made a method of the
ModelGraphTraverser.
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``BFG_UNICODE_PATH_SEGMENTS`` configuration variable have been
removed. Path segments are now always passed to model
``__getitem__`` methods as unicode. "True" has been the default for
this setting since 0.5.4, but changing this configuration setting to
false allowed you to go back to passing raw path element strings to
model ``__getitem__`` methods. This services a speed goal (we get
about +80 req/s by removing the check), and it's clearer just to
always expect unicode path segments in model ``__getitem__``
methods.
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