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annotate roundup/cgi/PageTemplates/PythonExpr.py @ 4531:ddff9669361b

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Fix matching of incoming email addresses to the alternate_addresses field... ...of a user -- this would match substrings, e.g. if the user has discuss-support@example.com as an alternate email and an incoming mail is addressed to support@example.com this would (wrongly) match. Note: I *think* I've seen this discussed somewhere but couldn't find it, neither in the tracker nor in recent discussions on the mailinglists. So if someone remembers an issue which now should be closed, please tell me :-)
author Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
date Wed, 24 Aug 2011 14:43:52 +0000
parents b43efe461b3e
children 6e3e4f24c753
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1 ##############################################################################
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2 #
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3 # Copyright (c) 2001 Zope Corporation and Contributors. All Rights Reserved.
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4 #
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5 # This software is subject to the provisions of the Zope Public License,
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6 # Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.
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7 # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
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8 # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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9 # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
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10 # FOR A PARTICULAR PURPOSE
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11 #
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12 ##############################################################################
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13 # Modified for Roundup:
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14 #
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15 # 1. more informative traceback info
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16
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17 """Generic Python Expression Handler
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18 """
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19
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20 __version__='$Revision: 1.6 $'[11:-2]
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21
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22 from TALES import CompilerError
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23 from sys import exc_info
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24
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25 class getSecurityManager:
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26 '''Null security manager'''
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27 def validate(self, *args, **kwargs):
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28 return 1
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29 addContext = removeContext = validateValue = validate
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30
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31 class PythonExpr:
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32 def __init__(self, name, expr, engine):
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33 self.expr = expr = expr.strip().replace('\n', ' ')
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34 try:
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35 d = {}
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36 exec 'def f():\n return %s\n' % expr.strip() in d
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37 self._f = d['f']
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38 except:
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39 raise CompilerError, ('Python expression error:\n'
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40 '%s: %s') % exc_info()[:2]
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41 self._get_used_names()
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42
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43 def _get_used_names(self):
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44 self._f_varnames = vnames = []
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45 for vname in self._f.func_code.co_names:
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46 if vname[0] not in '$_':
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47 vnames.append(vname)
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48
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49 def _bind_used_names(self, econtext, _marker=[]):
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50 # Bind template variables
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51 names = {'CONTEXTS': econtext.contexts}
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52 vars = econtext.vars
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53 getType = econtext.getCompiler().getTypes().get
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54 for vname in self._f_varnames:
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55 val = vars.get(vname, _marker)
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56 if val is _marker:
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57 has = val = getType(vname)
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58 if has:
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59 val = ExprTypeProxy(vname, val, econtext)
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60 names[vname] = val
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61 else:
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62 names[vname] = val
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63 return names
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64
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65 def __call__(self, econtext):
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66 __traceback_info__ = 'python expression "%s"'%self.expr
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67 f = self._f
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68 f.func_globals.update(self._bind_used_names(econtext))
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69 return f()
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70
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71 def __str__(self):
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72 return 'Python expression "%s"' % self.expr
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73 def __repr__(self):
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74 return '<PythonExpr %s>' % self.expr
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75
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76 class ExprTypeProxy:
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77 '''Class that proxies access to an expression type handler'''
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78 def __init__(self, name, handler, econtext):
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79 self._name = name
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80 self._handler = handler
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81 self._econtext = econtext
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82 def __call__(self, text):
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83 return self._handler(self._name, text,
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84 self._econtext.getCompiler())(self._econtext)
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85
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