+
−"""provide class to do Apache rewrite rules'job inside cubicweb (though functionnalities
+
−are much more limited for the moment)
+
−
+
−:organization: Logilab
+
−:copyright: 2007-2009 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
+
−:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
+
−"""
+
−
+
−__docformat__ = "restructuredtext en"
+
−
+
−from re import compile
+
−
+
−from cubicweb.web import Redirect
+
−from cubicweb.web.component import Component
+
−
+
−class RewriteCond(object):
+
−    def __init__(self, condition, match='host', rules=(), action='rewrite'):
+
−        self.condition = compile(condition)
+
−        assert match in ('host', 'path'), match
+
−        self.match_part = match
+
−        self.rules = []
+
−        for rule, replace in rules:
+
−            rulergx = compile(rule)
+
−            self.rules.append( (rulergx, replace) )
+
−        assert action in ('rewrite', 'redirect', 'stop'), action
+
−        self.process = getattr(self, 'action_%s' % action)
+
−
+
−    def match(self, **kwargs):
+
−        self._match = self.condition.match(kwargs[self.match_part])
+
−        return not self._match is None
+
−
+
−    def action_rewrite(self, path):
+
−        for rgx, replace in self.rules:
+
−            if not rgx.match(path) is None:
+
−                matchdict = self._match.groupdict() or None
+
−                if not matchdict is None:
+
−                    replace = replace % matchdict
+
−                return rgx.sub(replace, path)
+
−        return path
+
−
+
−    def action_redirect(self, path):
+
−        url = self.action_rewrite(path)
+
−        raise Redirect(url)
+
−
+
−    def action_stop(self, path):
+
−        return path
+
−
+
−
+
−class ApacheURLRewrite(Component):
+
−    """inherit from this class with actual rules to activate apache style rewriting
+
−
+
−    rules should have the form :
+
−
+
−    [('condition pattern 1', [('rule1 pattern', 'replace expression'),
+
−                              ('rule2 pattern', 'replace expression')],
+
−     ('condition pattern 2', [('rule1 pattern', 'replace expression'),
+
−                              ('rule2 pattern', 'replace expression')]
+
−    ]
+
−
+
−    for instance the equivalent of the following apache rules:
+
−
+
−        RewriteCond %{HTTP_HOST} ^logilab\.fr
+
−        RewriteRule ^/(.*) http://www.logilab.fr/$1 [L,R=301]
+
−
+
−        RewriteCond %{HTTP_HOST} ^www\.logilab\.fr
+
−        RewriteRule ^/(.*) http://localhost:8080/$1 [L,P]
+
−
+
−        RewriteCond %{HTTP_HOST} ^(.+)\.logilab\.fr
+
−        RewriteRule ^/(data/.*) http://localhost:8080/$1 [L,P]
+
−        RewriteRule ^/(json.*) http://localhost:8080/$1 [L,P]
+
−        RewriteRule ^/(.*) http://localhost:8080/m_%1/$1 [L,P]
+
−
+
−    could be written (considering that no "host rewritting" is necessary):
+
−
+
−      class MyAppRules(ApacheURLRewrite):
+
−        rules = [
+
−          RewriteCond('logilab\.fr', match='host',
+
−                      rules=[('/(.*)', r'http://www.logilab.fr/\1')],
+
−                      action='redirect'),
+
−          RewriteCond('(www)\.logilab\.fr', match='host', action='stop'),
+
−          RewriteCond('/(data|json)/', match='path', action='stop'),
+
−          RewriteCond('(?P<cat>.*)\.logilab\.fr', match='host',
+
−                      rules=[('/(.*)', r'/m_%(cat)s/\1')]),
+
−        ]
+
−    """
+
−    __abstract__ = True
+
−    id = 'urlrewriter'
+
−    rules = []
+
−
+
−    def rewrite(self, host, path):
+
−        for cond in self.rules:
+
−            if cond.match(host=host, path=path):
+
−                return cond.process(path)
+
−        return path