web/views/urlpublishing.py
author Aurelien Campeas <aurelien.campeas@logilab.fr>
Fri, 02 May 2014 17:41:11 +0200
changeset 10005 7769d0f61810
parent 9770 112c884b2d8d
child 10047 a1fde2d343b6
permissions -rw-r--r--
remove leftover pre 3.9 deprecation warnings
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# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""Associate url's path to view identifier / rql queries.
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CubicWeb finds all registered URLPathEvaluators, orders them according
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to their ``priority`` attribute and calls their ``evaluate_path()``
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method. The first that returns something and doesn't raise a
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``PathDontMatch`` exception wins.
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Here is the default evaluator chain:
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1. :class:`cubicweb.web.views.urlpublishing.RawPathEvaluator` handles
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   unique url segments that match exactly one of the registered
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   controller's *__regid__*. Urls such as */view?*, */edit?*, */json?*
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   fall in that category;
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2. :class:`cubicweb.web.views.urlpublishing.EidPathEvaluator` handles
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   unique url segments that are eids (e.g. */1234*);
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3. :class:`cubicweb.web.views.urlpublishing.URLRewriteEvaluator`
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   selects all urlrewriter components, sorts them according to their
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   priority, call their ``rewrite()`` method, the first one that
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   doesn't raise a ``KeyError`` wins. This is where the
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   :mod:`cubicweb.web.views.urlrewrite` and
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   :class:`cubicweb.web.views.urlrewrite.SimpleReqRewriter` comes into
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   play;
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4. :class:`cubicweb.web.views.urlpublishing.RestPathEvaluator` handles
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   urls based on entity types and attributes : <etype>((/<attribute
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   name>])?/<attribute value>)?  This is why ``cwuser/carlos`` works;
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5. :class:`cubicweb.web.views.urlpublishing.ActionPathEvaluator`
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   handles any of the previous paths with an additional trailing
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   "/<action>" segment, <action> being one of the registered actions'
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   __regid__.
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.. note::
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 Actionpath executes a query whose results is lost
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 because of redirecting instead of direct traversal.
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"""
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__docformat__ = "restructuredtext en"
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from rql import TypeResolverException
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from cubicweb import RegistryException
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from cubicweb.web import NotFound, Redirect, component
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class PathDontMatch(Exception):
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    """exception used by url evaluators to notify they can't evaluate
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    a path
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    """
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class URLPublisherComponent(component.Component):
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    """Associate url path to view identifier / rql queries, by
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    applying a chain of urlpathevaluator components.
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    An evaluator is a URLPathEvaluator subclass with an .evaluate_path
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    method taking the request object and the path to publish as
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    argument.  It will either return a publishing method identifier
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    and an rql query on success or raise a `PathDontMatch` exception
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    on failure. URL evaluators are called according to their
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    `priority` attribute, with 0 as the greatest priority and greater
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    values as lower priority. The first evaluator returning a result
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    or raising something else than `PathDontMatch` will stop the
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    handlers chain.
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    """
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    __regid__ = 'urlpublisher'
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    vreg = None # XXX necessary until property for deprecation warning is on appobject
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    def __init__(self, vreg, default_method='view'):
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        super(URLPublisherComponent, self).__init__()
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        self.vreg = vreg
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        self.default_method = default_method
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        evaluators = []
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        for evaluatorcls in vreg['components']['urlpathevaluator']:
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            # instantiation needed
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            evaluator = evaluatorcls(self)
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            evaluators.append(evaluator)
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        self.evaluators = sorted(evaluators, key=lambda x: x.priority)
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    def process(self, req, path):
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        """Given a URL (essentialy caracterized by a path on the
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        server, but additional information may be found in the request
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        object), return a publishing method identifier
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        (e.g. controller) and an optional result set.
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        :type req: `cubicweb.web.request.CubicWebRequestBase`
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        :param req: the request object
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        :type path: str
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        :param path: the path of the resource to publish. If empty, None or "/"
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                     "view" is used as the default path.
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diff changeset
   111
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f4219a6e62e3 [doc/book] stuff a bit the publishing process (including various docstrings)
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diff changeset
   112
        :rtype: tuple(str, `cubicweb.rset.ResultSet` or None)
0
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   113
        :return: the publishing method identifier and an optional result set
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diff changeset
   114
0
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   115
        :raise NotFound: if no handler is able to decode the given path
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   116
        """
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   117
        parts = [part for part in path.split('/')
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   118
                 if part != ''] or (self.default_method,)
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   119
        if req.form.get('rql'):
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diff changeset
   120
            if parts[0] in self.vreg['controllers']:
0
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   121
                return parts[0], None
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   122
            return 'view', None
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   123
        for evaluator in self.evaluators:
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   124
            try:
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   125
                pmid, rset = evaluator.evaluate_path(req, parts[:])
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   126
                break
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diff changeset
   127
            except PathDontMatch:
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diff changeset
   128
                continue
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   129
        else:
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   130
            raise NotFound(path)
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diff changeset
   131
        if pmid is None:
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   132
            pmid = self.default_method
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   133
        return pmid, rset
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parents:
diff changeset
   134
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d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 661
diff changeset
   135
2887
1282dc6525c5 give vreg where we need it (eg no bound request)
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2770
diff changeset
   136
class URLPathEvaluator(component.Component):
0
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   137
    __abstract__ = True
3377
dd9d292b6a6d use __regid__ instead of id on appobject classes
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2890
diff changeset
   138
    __regid__ = 'urlpathevaluator'
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1282dc6525c5 give vreg where we need it (eg no bound request)
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2770
diff changeset
   139
    vreg = None # XXX necessary until property for deprecation warning is on appobject
0
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diff changeset
   140
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   141
    def __init__(self, urlpublisher):
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   142
        self.urlpublisher = urlpublisher
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1282dc6525c5 give vreg where we need it (eg no bound request)
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2770
diff changeset
   143
        self.vreg = urlpublisher.vreg
0
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parents:
diff changeset
   144
6175
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5426
diff changeset
   145
0
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parents:
diff changeset
   146
class RawPathEvaluator(URLPathEvaluator):
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   147
    """handle path of the form::
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parents:
diff changeset
   148
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   149
        <publishing_method>?parameters...
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   150
    """
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diff changeset
   151
    priority = 0
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diff changeset
   152
    def evaluate_path(self, req, parts):
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18aec79ec3a3 R [vreg] important refactoring of the vregistry, moving behaviour to end dictionnary (and so leaving room for more flexibility ; keep bw compat ; update api usage in cw
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2293
diff changeset
   153
        if len(parts) == 1 and parts[0] in self.vreg['controllers']:
0
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diff changeset
   154
            return parts[0], None
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parents:
diff changeset
   155
        raise PathDontMatch()
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parents:
diff changeset
   156
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parents:
diff changeset
   157
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diff changeset
   158
class EidPathEvaluator(URLPathEvaluator):
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parents:
diff changeset
   159
    """handle path with the form::
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parents:
diff changeset
   160
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parents:
diff changeset
   161
        <eid>
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parents:
diff changeset
   162
    """
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parents:
diff changeset
   163
    priority = 1
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parents:
diff changeset
   164
    def evaluate_path(self, req, parts):
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parents:
diff changeset
   165
        if len(parts) != 1:
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diff changeset
   166
            raise PathDontMatch()
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parents:
diff changeset
   167
        try:
8748
f5027f8d2478 drop typed_eid() in favour of int() (closes #2742462)
Nicolas Chauvat <nicolas.chauvat@logilab.fr>
parents: 8272
diff changeset
   168
            rset = req.execute('Any X WHERE X eid %(x)s', {'x': int(parts[0])})
0
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parents:
diff changeset
   169
        except ValueError:
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parents:
diff changeset
   170
            raise PathDontMatch()
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parents:
diff changeset
   171
        if rset.rowcount == 0:
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parents:
diff changeset
   172
            raise NotFound()
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parents:
diff changeset
   173
        return None, rset
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parents:
diff changeset
   174
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d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 661
diff changeset
   175
0
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parents:
diff changeset
   176
class RestPathEvaluator(URLPathEvaluator):
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parents:
diff changeset
   177
    """handle path with the form::
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parents:
diff changeset
   178
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diff changeset
   179
        <etype>[[/<attribute name>]/<attribute value>]*
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diff changeset
   180
    """
6856
ac092197c099 [url publishing] evaluate url rewrite rules before rest path so one may easily override schema based urls
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6274
diff changeset
   181
    priority = 3
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parents: 661
diff changeset
   182
0
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parents:
diff changeset
   183
    def evaluate_path(self, req, parts):
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diff changeset
   184
        if not (0 < len(parts) < 4):
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diff changeset
   185
            raise PathDontMatch()
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parents:
diff changeset
   186
        try:
2273
daf6e178659f new case_insensitive_etypes resource on the cubicweb registry
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 1977
diff changeset
   187
            etype = self.vreg.case_insensitive_etypes[parts.pop(0).lower()]
0
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parents:
diff changeset
   188
        except KeyError:
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diff changeset
   189
            raise PathDontMatch()
2664
1578e1a57828 [we, test] more api update
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2657
diff changeset
   190
        cls = self.vreg['etypes'].etype_class(etype)
0
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parents:
diff changeset
   191
        if parts:
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parents:
diff changeset
   192
            if len(parts) == 2:
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parents:
diff changeset
   193
                attrname = parts.pop(0).lower()
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parents:
diff changeset
   194
                try:
3689
deb13e88e037 follow yams 0.25 api changes to improve performance
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2664
diff changeset
   195
                    cls.e_schema.subjrels[attrname]
0
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parents:
diff changeset
   196
                except KeyError:
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parents:
diff changeset
   197
                    raise PathDontMatch()
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parents:
diff changeset
   198
            else:
7828
749e1a67987f [entity] rename Entity._rest_attr_info into cw_rest_attr_info (closes #1942759)
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 7794
diff changeset
   199
                attrname = cls.cw_rest_attr_info()[0]
0
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diff changeset
   200
            value = req.url_unquote(parts.pop(0))
6253
30b6beb38820 [urlpublishing] refactor to ease overriding
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6175
diff changeset
   201
            return self.handle_etype_attr(req, cls, attrname, value)
30b6beb38820 [urlpublishing] refactor to ease overriding
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6175
diff changeset
   202
        return self.handle_etype(req, cls)
30b6beb38820 [urlpublishing] refactor to ease overriding
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6175
diff changeset
   203
6274
72bf3ec4068b [url publishing] fix regression introduced by refactoring in 3.9.7, leading to table view being choosen when one would expect the primary view. Fix similar pb with /<etype> url and list view (this one has been there for a while)
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6253
diff changeset
   204
    def set_vid_for_rset(self, req, cls, rset):# cls is there to ease overriding
0
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parents:
diff changeset
   205
        if rset.rowcount == 0:
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parents:
diff changeset
   206
            raise NotFound()
6274
72bf3ec4068b [url publishing] fix regression introduced by refactoring in 3.9.7, leading to table view being choosen when one would expect the primary view. Fix similar pb with /<etype> url and list view (this one has been there for a while)
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6253
diff changeset
   207
        # we've to set a default vid here, since vid_from_rset may try to use a
72bf3ec4068b [url publishing] fix regression introduced by refactoring in 3.9.7, leading to table view being choosen when one would expect the primary view. Fix similar pb with /<etype> url and list view (this one has been there for a while)
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6253
diff changeset
   208
        # table view if fetch_rql include some non final relation
72bf3ec4068b [url publishing] fix regression introduced by refactoring in 3.9.7, leading to table view being choosen when one would expect the primary view. Fix similar pb with /<etype> url and list view (this one has been there for a while)
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6253
diff changeset
   209
        if rset.rowcount == 1:
72bf3ec4068b [url publishing] fix regression introduced by refactoring in 3.9.7, leading to table view being choosen when one would expect the primary view. Fix similar pb with /<etype> url and list view (this one has been there for a while)
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6253
diff changeset
   210
            req.form.setdefault('vid', 'primary')
72bf3ec4068b [url publishing] fix regression introduced by refactoring in 3.9.7, leading to table view being choosen when one would expect the primary view. Fix similar pb with /<etype> url and list view (this one has been there for a while)
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6253
diff changeset
   211
        else: # rset.rowcount >= 1
72bf3ec4068b [url publishing] fix regression introduced by refactoring in 3.9.7, leading to table view being choosen when one would expect the primary view. Fix similar pb with /<etype> url and list view (this one has been there for a while)
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6253
diff changeset
   212
            req.form.setdefault('vid', 'sameetypelist')
72bf3ec4068b [url publishing] fix regression introduced by refactoring in 3.9.7, leading to table view being choosen when one would expect the primary view. Fix similar pb with /<etype> url and list view (this one has been there for a while)
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6253
diff changeset
   213
72bf3ec4068b [url publishing] fix regression introduced by refactoring in 3.9.7, leading to table view being choosen when one would expect the primary view. Fix similar pb with /<etype> url and list view (this one has been there for a while)
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6253
diff changeset
   214
    def handle_etype(self, req, cls):
72bf3ec4068b [url publishing] fix regression introduced by refactoring in 3.9.7, leading to table view being choosen when one would expect the primary view. Fix similar pb with /<etype> url and list view (this one has been there for a while)
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6253
diff changeset
   215
        rset = req.execute(cls.fetch_rql(req.user))
72bf3ec4068b [url publishing] fix regression introduced by refactoring in 3.9.7, leading to table view being choosen when one would expect the primary view. Fix similar pb with /<etype> url and list view (this one has been there for a while)
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6253
diff changeset
   216
        self.set_vid_for_rset(req, cls, rset)
0
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parents:
diff changeset
   217
        return None, rset
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parents:
diff changeset
   218
6253
30b6beb38820 [urlpublishing] refactor to ease overriding
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6175
diff changeset
   219
    def handle_etype_attr(self, req, cls, attrname, value):
7794
aed065b97f12 refactor entity fetch_rql method to use a RQL syntax tree instead of RQL strings ; closes #1585650
Florent Cayré <florent.cayre@gmail.com>
parents: 7272
diff changeset
   220
        st = cls.fetch_rqlst(req.user, ordermethod=None)
aed065b97f12 refactor entity fetch_rql method to use a RQL syntax tree instead of RQL strings ; closes #1585650
Florent Cayré <florent.cayre@gmail.com>
parents: 7272
diff changeset
   221
        st.add_constant_restriction(st.get_variable('X'), attrname,
aed065b97f12 refactor entity fetch_rql method to use a RQL syntax tree instead of RQL strings ; closes #1585650
Florent Cayré <florent.cayre@gmail.com>
parents: 7272
diff changeset
   222
                                    'x', 'Substitute')
0
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parents:
diff changeset
   223
        if attrname == 'eid':
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parents:
diff changeset
   224
            try:
8748
f5027f8d2478 drop typed_eid() in favour of int() (closes #2742462)
Nicolas Chauvat <nicolas.chauvat@logilab.fr>
parents: 8272
diff changeset
   225
                rset = req.execute(st.as_string(), {'x': int(value)})
0
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parents:
diff changeset
   226
            except (ValueError, TypeResolverException):
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parents:
diff changeset
   227
                # conflicting eid/type
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                raise PathDontMatch()
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        else:
7794
aed065b97f12 refactor entity fetch_rql method to use a RQL syntax tree instead of RQL strings ; closes #1585650
Florent Cayré <florent.cayre@gmail.com>
parents: 7272
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   230
            rset = req.execute(st.as_string(), {'x': value})
6274
72bf3ec4068b [url publishing] fix regression introduced by refactoring in 3.9.7, leading to table view being choosen when one would expect the primary view. Fix similar pb with /<etype> url and list view (this one has been there for a while)
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6253
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   231
        self.set_vid_for_rset(req, cls, rset)
6253
30b6beb38820 [urlpublishing] refactor to ease overriding
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6175
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   232
        return None, rset
0
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   234
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class URLRewriteEvaluator(URLPathEvaluator):
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    """tries to find a rewrite rule to apply
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    URL rewrite rule definitions are stored in URLRewriter objects
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    """
6856
ac092197c099 [url publishing] evaluate url rewrite rules before rest path so one may easily override schema based urls
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6274
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   240
    priority = 2
ac092197c099 [url publishing] evaluate url rewrite rules before rest path so one may easily override schema based urls
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6274
diff changeset
   241
0
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    def evaluate_path(self, req, parts):
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        # uri <=> req._twreq.path or req._twreq.uri
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        uri = req.url_unquote('/' + '/'.join(parts))
2657
de974465d381 [appobject] kill VObject class, move base selector classes to appobject
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2650
diff changeset
   245
        evaluators = sorted(self.vreg['urlrewriting'].all_objects(),
de974465d381 [appobject] kill VObject class, move base selector classes to appobject
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parents: 2650
diff changeset
   246
                            key=lambda x: x.priority, reverse=True)
de974465d381 [appobject] kill VObject class, move base selector classes to appobject
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2650
diff changeset
   247
        for rewritercls in evaluators:
2890
fdcb8a2bb6eb fix __init__ parameters
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2887
diff changeset
   248
            rewriter = rewritercls(req)
0
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   249
            try:
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                # XXX we might want to chain url rewrites
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   251
                return rewriter.rewrite(req, uri)
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   252
            except KeyError:
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   253
                continue
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   254
        raise PathDontMatch()
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 661
diff changeset
   255
0
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parents:
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   256
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class ActionPathEvaluator(URLPathEvaluator):
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    """handle path with the form::
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   259
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    <any evaluator path>/<action>
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   261
    """
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    priority = 4
6856
ac092197c099 [url publishing] evaluate url rewrite rules before rest path so one may easily override schema based urls
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6274
diff changeset
   263
0
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   264
    def evaluate_path(self, req, parts):
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   265
        if len(parts) < 2:
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   266
            raise PathDontMatch()
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   267
        # remove last part and see if this is something like an actions
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parents:
diff changeset
   268
        # if so, call
2770
356e9d7c356d R propagate registry API changes
Nicolas Chauvat <nicolas.chauvat@logilab.fr>
parents: 2664
diff changeset
   269
        # XXX bad smell: refactor to simpler code
0
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parents:
diff changeset
   270
        try:
2650
18aec79ec3a3 R [vreg] important refactoring of the vregistry, moving behaviour to end dictionnary (and so leaving room for more flexibility ; keep bw compat ; update api usage in cw
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2293
diff changeset
   271
            actionsreg = self.vreg['actions']
0
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parents:
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   272
            requested = parts.pop(-1)
2650
18aec79ec3a3 R [vreg] important refactoring of the vregistry, moving behaviour to end dictionnary (and so leaving room for more flexibility ; keep bw compat ; update api usage in cw
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2293
diff changeset
   273
            actions = actionsreg[requested]
0
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parents:
diff changeset
   274
        except RegistryException:
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diff changeset
   275
            raise PathDontMatch()
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diff changeset
   276
        for evaluator in self.urlpublisher.evaluators:
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diff changeset
   277
            if evaluator is self or evaluator.priority == 0:
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diff changeset
   278
                continue
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diff changeset
   279
            try:
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diff changeset
   280
                pmid, rset = evaluator.evaluate_path(req, parts[:])
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parents:
diff changeset
   281
            except PathDontMatch:
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   282
                continue
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diff changeset
   283
            else:
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diff changeset
   284
                try:
2770
356e9d7c356d R propagate registry API changes
Nicolas Chauvat <nicolas.chauvat@logilab.fr>
parents: 2664
diff changeset
   285
                    action = actionsreg._select_best(actions, req, rset=rset)
7272
771f594c12a2 [vreg] vregistry._select_best was needlessly instanciating NoSelectableObject (closes #1626708)
Alexandre Fayolle <alexandre.fayolle@logilab.fr>
parents: 6961
diff changeset
   286
                    if action is not None:
771f594c12a2 [vreg] vregistry._select_best was needlessly instanciating NoSelectableObject (closes #1626708)
Alexandre Fayolle <alexandre.fayolle@logilab.fr>
parents: 6961
diff changeset
   287
                        raise Redirect(action.url())
0
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parents:
diff changeset
   288
                except RegistryException:
7272
771f594c12a2 [vreg] vregistry._select_best was needlessly instanciating NoSelectableObject (closes #1626708)
Alexandre Fayolle <alexandre.fayolle@logilab.fr>
parents: 6961
diff changeset
   289
                    pass # continue searching
0
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   290
        raise PathDontMatch()