author | Adrien Di Mascio <Adrien.DiMascio@logilab.fr> |
Fri, 27 Aug 2010 13:44:55 +0200 | |
branch | stable |
changeset 6165 | 7da7c270bbbd |
parent 5426 | 0d4853a6e5ee |
child 6175 | 104453c4ed3e |
permissions | -rw-r--r-- |
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# copyright 2003-2010 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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3 |
# |
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4 |
# This file is part of CubicWeb. |
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parents:
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5 |
# |
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parents:
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6 |
# CubicWeb is free software: you can redistribute it and/or modify it under the |
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7 |
# terms of the GNU Lesser General Public License as published by the Free |
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8 |
# Software Foundation, either version 2.1 of the License, or (at your option) |
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9 |
# any later version. |
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10 |
# |
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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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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
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14 |
# details. |
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parents:
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15 |
# |
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parents:
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16 |
# 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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It currently handles url path with the forms: |
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* <publishing_method> |
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* minimal REST publishing: |
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* <eid> |
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* <etype>[/<attribute name>/<attribute value>]* |
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* folder navigation |
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You can actually control URL (more exactly path) resolution using an |
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URL path evaluator. |
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.. note:: |
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|
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Actionpath and Folderpath execute 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, typed_eid |
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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. |
0 | 53 |
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An evaluator is a URLPathEvaluator subclass with an .evaluate_path |
0 | 55 |
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. |
0 | 63 |
""" |
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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 |
74 |
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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0 | 78 |
def process(self, req, path): |
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"""Given an 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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83 |
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:type req: `cubicweb.web.request.CubicWebRequestBase` |
0 | 85 |
:param req: the request object |
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0 | 87 |
:type path: str |
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:param path: the path of the resource to publish |
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:rtype: tuple(str, `cubicweb.rset.ResultSet` or None) |
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:return: the publishing method identifier and an optional result set |
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0 | 93 |
:raise NotFound: if no handler is able to decode the given path |
94 |
""" |
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95 |
parts = [part for part in path.split('/') |
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if part != ''] or (self.default_method,) |
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if req.form.get('rql'): |
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if parts[0] in self.vreg['controllers']: |
0 | 99 |
return parts[0], None |
100 |
return 'view', None |
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101 |
for evaluator in self.evaluators: |
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try: |
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103 |
pmid, rset = evaluator.evaluate_path(req, parts[:]) |
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break |
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except PathDontMatch: |
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106 |
continue |
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107 |
else: |
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raise NotFound(path) |
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if pmid is None: |
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pmid = self.default_method |
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return pmid, rset |
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113 |
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class URLPathEvaluator(component.Component): |
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__abstract__ = True |
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__regid__ = 'urlpathevaluator' |
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vreg = None # XXX necessary until property for deprecation warning is on appobject |
0 | 118 |
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119 |
def __init__(self, urlpublisher): |
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self.urlpublisher = urlpublisher |
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self.vreg = urlpublisher.vreg |
0 | 122 |
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class RawPathEvaluator(URLPathEvaluator): |
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"""handle path of the form:: |
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125 |
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126 |
<publishing_method>?parameters... |
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""" |
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priority = 0 |
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def evaluate_path(self, req, parts): |
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if len(parts) == 1 and parts[0] in self.vreg['controllers']: |
0 | 131 |
return parts[0], None |
132 |
raise PathDontMatch() |
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133 |
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134 |
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135 |
class EidPathEvaluator(URLPathEvaluator): |
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136 |
"""handle path with the form:: |
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137 |
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138 |
<eid> |
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139 |
""" |
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140 |
priority = 1 |
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141 |
def evaluate_path(self, req, parts): |
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142 |
if len(parts) != 1: |
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143 |
raise PathDontMatch() |
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144 |
try: |
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rset = req.execute('Any X WHERE X eid %(x)s', {'x': typed_eid(parts[0])}) |
0 | 146 |
except ValueError: |
147 |
raise PathDontMatch() |
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148 |
if rset.rowcount == 0: |
|
149 |
raise NotFound() |
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150 |
return None, rset |
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151 |
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152 |
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0 | 153 |
class RestPathEvaluator(URLPathEvaluator): |
154 |
"""handle path with the form:: |
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155 |
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156 |
<etype>[[/<attribute name>]/<attribute value>]* |
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157 |
""" |
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158 |
priority = 2 |
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159 |
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0 | 160 |
def evaluate_path(self, req, parts): |
161 |
if not (0 < len(parts) < 4): |
|
162 |
raise PathDontMatch() |
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163 |
try: |
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etype = self.vreg.case_insensitive_etypes[parts.pop(0).lower()] |
0 | 165 |
except KeyError: |
166 |
raise PathDontMatch() |
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167 |
cls = self.vreg['etypes'].etype_class(etype) |
0 | 168 |
if parts: |
169 |
if len(parts) == 2: |
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170 |
attrname = parts.pop(0).lower() |
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171 |
try: |
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172 |
cls.e_schema.subjrels[attrname] |
0 | 173 |
except KeyError: |
174 |
raise PathDontMatch() |
|
175 |
else: |
|
176 |
attrname = cls._rest_attr_info()[0] |
|
177 |
value = req.url_unquote(parts.pop(0)) |
|
178 |
rset = self.attr_rset(req, etype, attrname, value) |
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179 |
else: |
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180 |
rset = self.cls_rset(req, cls) |
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181 |
if rset.rowcount == 0: |
|
182 |
raise NotFound() |
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183 |
return None, rset |
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184 |
||
185 |
def cls_rset(self, req, cls): |
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186 |
return req.execute(cls.fetch_rql(req.user)) |
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d628defebc17
delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
661
diff
changeset
|
187 |
|
0 | 188 |
def attr_rset(self, req, etype, attrname, value): |
189 |
rql = u'Any X WHERE X is %s, X %s %%(x)s' % (etype, attrname) |
|
190 |
if attrname == 'eid': |
|
191 |
try: |
|
5174
78438ad513ca
#759035: Automate addition of eid cachekey in RQL analysis
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
4252
diff
changeset
|
192 |
rset = req.execute(rql, {'x': typed_eid(value)}) |
0 | 193 |
except (ValueError, TypeResolverException): |
194 |
# conflicting eid/type |
|
195 |
raise PathDontMatch() |
|
196 |
else: |
|
197 |
rset = req.execute(rql, {'x': value}) |
|
198 |
return rset |
|
199 |
||
200 |
||
201 |
class URLRewriteEvaluator(URLPathEvaluator): |
|
202 |
"""tries to find a rewrite rule to apply |
|
203 |
||
204 |
URL rewrite rule definitions are stored in URLRewriter objects |
|
205 |
""" |
|
206 |
priority = 3 |
|
207 |
def evaluate_path(self, req, parts): |
|
208 |
# uri <=> req._twreq.path or req._twreq.uri |
|
209 |
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
|
210 |
evaluators = sorted(self.vreg['urlrewriting'].all_objects(), |
de974465d381
[appobject] kill VObject class, move base selector classes to appobject
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
2650
diff
changeset
|
211 |
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
|
212 |
for rewritercls in evaluators: |
2890
fdcb8a2bb6eb
fix __init__ parameters
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
2887
diff
changeset
|
213 |
rewriter = rewritercls(req) |
0 | 214 |
try: |
215 |
# XXX we might want to chain url rewrites |
|
216 |
return rewriter.rewrite(req, uri) |
|
217 |
except KeyError: |
|
218 |
continue |
|
219 |
raise PathDontMatch() |
|
1802
d628defebc17
delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
661
diff
changeset
|
220 |
|
0 | 221 |
|
222 |
class ActionPathEvaluator(URLPathEvaluator): |
|
223 |
"""handle path with the form:: |
|
224 |
||
225 |
<any evaluator path>/<action> |
|
226 |
""" |
|
227 |
priority = 4 |
|
228 |
def evaluate_path(self, req, parts): |
|
229 |
if len(parts) < 2: |
|
230 |
raise PathDontMatch() |
|
231 |
# remove last part and see if this is something like an actions |
|
232 |
# if so, call |
|
2770
356e9d7c356d
R propagate registry API changes
Nicolas Chauvat <nicolas.chauvat@logilab.fr>
parents:
2664
diff
changeset
|
233 |
# XXX bad smell: refactor to simpler code |
0 | 234 |
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
|
235 |
actionsreg = self.vreg['actions'] |
0 | 236 |
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
|
237 |
actions = actionsreg[requested] |
0 | 238 |
except RegistryException: |
239 |
raise PathDontMatch() |
|
240 |
for evaluator in self.urlpublisher.evaluators: |
|
241 |
if evaluator is self or evaluator.priority == 0: |
|
242 |
continue |
|
243 |
try: |
|
244 |
pmid, rset = evaluator.evaluate_path(req, parts[:]) |
|
245 |
except PathDontMatch: |
|
246 |
continue |
|
247 |
else: |
|
248 |
try: |
|
2770
356e9d7c356d
R propagate registry API changes
Nicolas Chauvat <nicolas.chauvat@logilab.fr>
parents:
2664
diff
changeset
|
249 |
action = actionsreg._select_best(actions, req, rset=rset) |
0 | 250 |
except RegistryException: |
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
|
251 |
continue |
0 | 252 |
else: |
253 |
# XXX avoid redirect |
|
254 |
raise Redirect(action.url()) |
|
255 |
raise PathDontMatch() |