web/views/apacherewrite.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Wed, 28 Apr 2010 12:15:52 +0200
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replace logilab-common by CubicWeb in disclaimer
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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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#
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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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"""provide class to do Apache rewrite rules'job inside cubicweb (though functionnalities
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are much more limited for the moment)
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"""
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__docformat__ = "restructuredtext en"
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from re import compile
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from cubicweb.web import Redirect
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from cubicweb.web.component import Component
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class RewriteCond(object):
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    def __init__(self, condition, match='host', rules=(), action='rewrite'):
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        self.condition = compile(condition)
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        assert match in ('host', 'path'), match
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        self.match_part = match
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        self.rules = []
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        for rule, replace in rules:
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            rulergx = compile(rule)
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            self.rules.append( (rulergx, replace) )
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        assert action in ('rewrite', 'redirect', 'stop'), action
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        self.process = getattr(self, 'action_%s' % action)
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    def match(self, **kwargs):
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        self._match = self.condition.match(kwargs[self.match_part])
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        return not self._match is None
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    def action_rewrite(self, path):
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        for rgx, replace in self.rules:
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            if not rgx.match(path) is None:
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                matchdict = self._match.groupdict() or None
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                if not matchdict is None:
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                    replace = replace % matchdict
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                return rgx.sub(replace, path)
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        return path
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    def action_redirect(self, path):
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        url = self.action_rewrite(path)
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        raise Redirect(url)
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    def action_stop(self, path):
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        return path
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class ApacheURLRewrite(Component):
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    """inherit from this class with actual rules to activate apache style rewriting
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    rules should have the form :
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    [('condition pattern 1', [('rule1 pattern', 'replace expression'),
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                              ('rule2 pattern', 'replace expression')],
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     ('condition pattern 2', [('rule1 pattern', 'replace expression'),
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                              ('rule2 pattern', 'replace expression')]
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    ]
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    for instance the equivalent of the following apache rules:
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        RewriteCond %{HTTP_HOST} ^logilab\.fr
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        RewriteRule ^/(.*) http://www.logilab.fr/$1 [L,R=301]
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        RewriteCond %{HTTP_HOST} ^www\.logilab\.fr
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        RewriteRule ^/(.*) http://localhost:8080/$1 [L,P]
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        RewriteCond %{HTTP_HOST} ^(.+)\.logilab\.fr
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        RewriteRule ^/(data/.*) http://localhost:8080/$1 [L,P]
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        RewriteRule ^/(json.*) http://localhost:8080/$1 [L,P]
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        RewriteRule ^/(.*) http://localhost:8080/m_%1/$1 [L,P]
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    could be written (considering that no "host rewritting" is necessary):
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      class MyAppRules(ApacheURLRewrite):
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        rules = [
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          RewriteCond('logilab\.fr', match='host',
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                      rules=[('/(.*)', r'http://www.logilab.fr/\1')],
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                      action='redirect'),
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          RewriteCond('(www)\.logilab\.fr', match='host', action='stop'),
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          RewriteCond('/(data|json)/', match='path', action='stop'),
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          RewriteCond('(?P<cat>.*)\.logilab\.fr', match='host',
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                      rules=[('/(.*)', r'/m_%(cat)s/\1')]),
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        ]
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    """
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    __abstract__ = True
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    __regid__ = 'urlrewriter'
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    rules = []
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    def get_rules(self, req):
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        return self.rules
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    def rewrite(self, host, path, req):
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        for cond in self.get_rules(req):
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            if cond.match(host=host, path=path):
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                return cond.process(path)
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        return path