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1 """provide class to do Apache rewrite rules'job inside cubicweb (though functionnalities |
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2 are much more limited for the moment) |
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3 |
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4 :organization: Logilab |
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5 :copyright: 2007-2008 LOGILAB S.A. (Paris, FRANCE), all rights reserved. |
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6 :contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr |
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7 """ |
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8 |
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9 __docformat__ = "restructuredtext en" |
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10 |
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11 from re import compile |
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12 |
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13 from cubicweb.web import Redirect |
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14 from cubicweb.web.component import SingletonComponent |
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15 |
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16 class RewriteCond(object): |
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17 def __init__(self, condition, match='host', rules=(), action='rewrite'): |
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18 self.condition = compile(condition) |
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19 assert match in ('host', 'path'), match |
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20 self.match_part = match |
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21 self.rules = [] |
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22 for rule, replace in rules: |
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23 rulergx = compile(rule) |
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24 self.rules.append( (rulergx, replace) ) |
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25 assert action in ('rewrite', 'redirect', 'stop'), action |
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26 self.process = getattr(self, 'action_%s' % action) |
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27 |
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28 def match(self, **kwargs): |
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29 self._match = self.condition.match(kwargs[self.match_part]) |
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30 return not self._match is None |
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31 |
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32 def action_rewrite(self, path): |
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33 for rgx, replace in self.rules: |
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34 if not rgx.match(path) is None: |
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35 matchdict = self._match.groupdict() or None |
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36 if not matchdict is None: |
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37 replace = replace % matchdict |
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38 return rgx.sub(replace, path) |
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39 return path |
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40 |
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41 def action_redirect(self, path): |
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42 url = self.action_rewrite(path) |
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43 raise Redirect(url) |
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44 |
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45 def action_stop(self, path): |
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46 return path |
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47 |
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48 |
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49 class ApacheURLRewrite(SingletonComponent): |
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50 """inherit from this class with actual rules to activate apache style rewriting |
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51 |
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52 rules should have the form : |
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53 |
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54 [('condition pattern 1', [('rule1 pattern', 'replace expression'), |
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55 ('rule2 pattern', 'replace expression')], |
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56 ('condition pattern 2', [('rule1 pattern', 'replace expression'), |
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57 ('rule2 pattern', 'replace expression')] |
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58 ] |
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59 |
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60 for instance the equivalent of the following apache rules: |
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61 |
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62 RewriteCond %{HTTP_HOST} ^logilab\.fr |
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63 RewriteRule ^/(.*) http://www.logilab.fr/$1 [L,R=301] |
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64 |
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65 RewriteCond %{HTTP_HOST} ^www\.logilab\.fr |
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66 RewriteRule ^/(.*) http://localhost:8080/$1 [L,P] |
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67 |
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68 RewriteCond %{HTTP_HOST} ^(.+)\.logilab\.fr |
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69 RewriteRule ^/(data/.*) http://localhost:8080/$1 [L,P] |
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70 RewriteRule ^/(json.*) http://localhost:8080/$1 [L,P] |
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71 RewriteRule ^/(.*) http://localhost:8080/m_%1/$1 [L,P] |
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72 |
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73 could be written (considering that no "host rewritting" is necessary): |
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74 |
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75 class MyAppRules(ApacheURLRewrite): |
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76 rules = [ |
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77 RewriteCond('logilab\.fr', match='host', |
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78 rules=[('/(.*)', r'http://www.logilab.fr/\1')], |
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79 action='redirect'), |
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80 RewriteCond('(www)\.logilab\.fr', match='host', action='stop'), |
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81 RewriteCond('/(data|json)/', match='path', action='stop'), |
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82 RewriteCond('(?P<cat>.*)\.logilab\.fr', match='host', |
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83 rules=[('/(.*)', r'/m_%(cat)s/\1')]), |
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84 ] |
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85 """ |
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86 __abstract__ = True |
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87 id = 'urlrewriter' |
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88 rules = [] |
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89 |
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90 def rewrite(self, host, path): |
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91 for cond in self.rules: |
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92 if cond.match(host=host, path=path): |
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93 return cond.process(path) |
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94 return path |