Mercurial > p > roundup > code
annotate roundup/cgi/PageTemplates/Expressions.py @ 4531:ddff9669361b
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 | 445e1bc8b1df |
| children | 6e3e4f24c753 |
| rev | line source |
|---|---|
| 1049 | 1 ############################################################################## |
| 2 # | |
| 3 # Copyright (c) 2001 Zope Corporation and Contributors. All Rights Reserved. | |
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4 # |
| 1049 | 5 # This software is subject to the provisions of the Zope Public License, |
| 6 # Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution. | |
| 7 # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED | |
| 8 # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
| 9 # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS | |
| 10 # FOR A PARTICULAR PURPOSE | |
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11 # |
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12 ############################################################################## |
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13 # Modified for Roundup: |
| 1049 | 14 # |
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15 # 1. removed all Zope-specific code (doesn't even try to import that stuff now) |
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16 # 2. removed all Acquisition |
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17 # 3. removed blocking of leading-underscore URL components |
| 1049 | 18 |
| 19 """Page Template Expression Engine | |
| 20 | |
| 21 Page Template-specific implementation of TALES, with handlers | |
| 22 for Python expressions, string literals, and paths. | |
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23 """ |
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24 |
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25 __version__='$Revision: 1.12 $'[11:-2] |
| 1049 | 26 |
| 27 import re, sys | |
| 28 from TALES import Engine, CompilerError, _valid_name, NAME_RE, \ | |
| 29 Undefined, Default, _parse_expr | |
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30 |
| 1049 | 31 |
| 32 _engine = None | |
| 33 def getEngine(): | |
| 34 global _engine | |
| 35 if _engine is None: | |
| 36 from PathIterator import Iterator | |
| 37 _engine = Engine(Iterator) | |
| 38 installHandlers(_engine) | |
| 39 return _engine | |
| 40 | |
| 41 def installHandlers(engine): | |
| 42 reg = engine.registerType | |
| 43 pe = PathExpr | |
| 44 for pt in ('standard', 'path', 'exists', 'nocall'): | |
| 45 reg(pt, pe) | |
| 46 reg('string', StringExpr) | |
| 47 reg('python', PythonExpr) | |
| 48 reg('not', NotExpr) | |
| 49 reg('defer', DeferExpr) | |
| 50 | |
| 51 from PythonExpr import getSecurityManager, PythonExpr | |
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52 guarded_getattr = getattr |
| 1049 | 53 try: |
| 54 from zExceptions import Unauthorized | |
| 55 except ImportError: | |
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56 class Unauthorized(Exception): |
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57 pass |
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58 |
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59 def acquisition_security_filter(orig, inst, name, v, real_validate): |
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60 if real_validate(orig, inst, name, v): |
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61 return 1 |
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62 raise Unauthorized, name |
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63 |
| 1049 | 64 def call_with_ns(f, ns, arg=1): |
| 65 if arg==2: | |
| 66 return f(None, ns) | |
| 67 else: | |
| 68 return f(ns) | |
| 69 | |
| 70 class _SecureModuleImporter: | |
| 71 """Simple version of the importer for use with trusted code.""" | |
| 72 __allow_access_to_unprotected_subobjects__ = 1 | |
| 73 def __getitem__(self, module): | |
| 74 __import__(module) | |
| 75 return sys.modules[module] | |
| 76 | |
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77 SecureModuleImporter = _SecureModuleImporter() |
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78 |
| 1049 | 79 Undefs = (Undefined, AttributeError, KeyError, |
| 80 TypeError, IndexError, Unauthorized) | |
| 81 | |
| 82 def render(ob, ns): | |
| 83 """ | |
| 84 Calls the object, possibly a document template, or just returns it if | |
| 85 not callable. (From DT_Util.py) | |
| 86 """ | |
| 87 if hasattr(ob, '__render_with_namespace__'): | |
| 88 ob = call_with_ns(ob.__render_with_namespace__, ns) | |
| 89 else: | |
| 90 base = ob | |
| 91 if callable(base): | |
| 92 try: | |
| 93 if getattr(base, 'isDocTemp', 0): | |
| 94 ob = call_with_ns(ob, ns, 2) | |
| 95 else: | |
| 96 ob = ob() | |
| 97 except AttributeError, n: | |
| 98 if str(n) != '__call__': | |
| 99 raise | |
| 100 return ob | |
| 101 | |
| 102 class SubPathExpr: | |
| 103 def __init__(self, path): | |
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104 self._path = path = path.strip().split('/') |
| 1049 | 105 self._base = base = path.pop(0) |
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106 if base and not _valid_name(base): |
| 1049 | 107 raise CompilerError, 'Invalid variable name "%s"' % base |
| 108 # Parse path | |
| 109 self._dp = dp = [] | |
| 110 for i in range(len(path)): | |
| 111 e = path[i] | |
| 112 if e[:1] == '?' and _valid_name(e[1:]): | |
| 113 dp.append((i, e[1:])) | |
| 114 dp.reverse() | |
| 115 | |
| 116 def _eval(self, econtext, | |
| 117 list=list, isinstance=isinstance, StringType=type('')): | |
| 118 vars = econtext.vars | |
| 119 path = self._path | |
| 120 if self._dp: | |
| 121 path = list(path) # Copy! | |
| 122 for i, varname in self._dp: | |
| 123 val = vars[varname] | |
| 124 if isinstance(val, StringType): | |
| 125 path[i] = val | |
| 126 else: | |
| 127 # If the value isn't a string, assume it's a sequence | |
| 128 # of path names. | |
| 129 path[i:i+1] = list(val) | |
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130 base = self._base |
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131 __traceback_info__ = 'path expression "%s"'%('/'.join(self._path)) |
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132 if base == 'CONTEXTS' or not base: |
| 1049 | 133 ob = econtext.contexts |
| 134 else: | |
| 135 ob = vars[base] | |
| 136 if isinstance(ob, DeferWrapper): | |
| 137 ob = ob() | |
| 138 if path: | |
| 139 ob = restrictedTraverse(ob, path, getSecurityManager()) | |
| 140 return ob | |
| 141 | |
| 142 class PathExpr: | |
| 143 def __init__(self, name, expr, engine): | |
| 144 self._s = expr | |
| 145 self._name = name | |
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146 self._hybrid = 0 |
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147 paths = expr.split('|') |
| 1049 | 148 self._subexprs = [] |
| 149 add = self._subexprs.append | |
| 150 for i in range(len(paths)): | |
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151 path = paths[i].lstrip() |
| 1049 | 152 if _parse_expr(path): |
| 153 # This part is the start of another expression type, | |
| 154 # so glue it back together and compile it. | |
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155 add(engine.compile(('|'.join(paths[i:]).lstrip()))) |
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156 self._hybrid = 1 |
| 1049 | 157 break |
| 158 add(SubPathExpr(path)._eval) | |
| 159 | |
| 160 def _exists(self, econtext): | |
| 161 for expr in self._subexprs: | |
| 162 try: | |
| 163 expr(econtext) | |
| 164 except Undefs: | |
| 165 pass | |
| 166 else: | |
| 167 return 1 | |
| 168 return 0 | |
| 169 | |
| 170 def _eval(self, econtext, | |
| 171 isinstance=isinstance, StringType=type(''), render=render): | |
| 172 for expr in self._subexprs[:-1]: | |
| 173 # Try all but the last subexpression, skipping undefined ones. | |
| 174 try: | |
| 175 ob = expr(econtext) | |
| 176 except Undefs: | |
| 177 pass | |
| 178 else: | |
| 179 break | |
| 180 else: | |
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181 # On the last subexpression allow exceptions through, and |
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182 # don't autocall if the expression was not a subpath. |
| 1049 | 183 ob = self._subexprs[-1](econtext) |
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184 if self._hybrid: |
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185 return ob |
| 1049 | 186 |
| 187 if self._name == 'nocall' or isinstance(ob, StringType): | |
| 188 return ob | |
| 189 # Return the rendered object | |
| 190 return render(ob, econtext.vars) | |
| 191 | |
| 192 def __call__(self, econtext): | |
| 193 if self._name == 'exists': | |
| 194 return self._exists(econtext) | |
| 195 return self._eval(econtext) | |
| 196 | |
| 197 def __str__(self): | |
| 198 return '%s expression %s' % (self._name, `self._s`) | |
| 199 | |
| 200 def __repr__(self): | |
| 201 return '%s:%s' % (self._name, `self._s`) | |
| 202 | |
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203 |
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204 _interp = re.compile(r'\$(%(n)s)|\${(%(n)s(?:/[^}]*)*)}' % {'n': NAME_RE}) |
| 1049 | 205 |
| 206 class StringExpr: | |
| 207 def __init__(self, name, expr, engine): | |
| 208 self._s = expr | |
| 209 if '%' in expr: | |
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210 expr = expr.replace('%', '%%') |
| 1049 | 211 self._vars = vars = [] |
| 212 if '$' in expr: | |
| 213 parts = [] | |
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214 for exp in expr.split('$$'): |
| 1049 | 215 if parts: parts.append('$') |
| 216 m = _interp.search(exp) | |
| 217 while m is not None: | |
| 218 parts.append(exp[:m.start()]) | |
| 219 parts.append('%s') | |
| 220 vars.append(PathExpr('path', m.group(1) or m.group(2), | |
| 221 engine)) | |
| 222 exp = exp[m.end():] | |
| 223 m = _interp.search(exp) | |
| 224 if '$' in exp: | |
| 225 raise CompilerError, ( | |
| 226 '$ must be doubled or followed by a simple path') | |
| 227 parts.append(exp) | |
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228 expr = ''.join(parts) |
| 1049 | 229 self._expr = expr |
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230 |
| 1049 | 231 def __call__(self, econtext): |
| 232 vvals = [] | |
| 233 for var in self._vars: | |
| 234 v = var(econtext) | |
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235 # I hope this isn't in use anymore. |
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236 ## if isinstance(v, Exception): |
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237 ## raise v |
| 1049 | 238 vvals.append(v) |
| 239 return self._expr % tuple(vvals) | |
| 240 | |
| 241 def __str__(self): | |
| 242 return 'string expression %s' % `self._s` | |
| 243 | |
| 244 def __repr__(self): | |
| 245 return 'string:%s' % `self._s` | |
| 246 | |
| 247 class NotExpr: | |
| 248 def __init__(self, name, expr, compiler): | |
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249 self._s = expr = expr.lstrip() |
| 1049 | 250 self._c = compiler.compile(expr) |
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251 |
| 1049 | 252 def __call__(self, econtext): |
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253 # We use the (not x) and 1 or 0 formulation to avoid changing |
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254 # the representation of the result in Python 2.3, where the |
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255 # result of "not" becomes an instance of bool. |
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256 return (not econtext.evaluateBoolean(self._c)) and 1 or 0 |
| 1049 | 257 |
| 258 def __repr__(self): | |
| 259 return 'not:%s' % `self._s` | |
| 260 | |
| 261 class DeferWrapper: | |
| 262 def __init__(self, expr, econtext): | |
| 263 self._expr = expr | |
| 264 self._econtext = econtext | |
| 265 | |
| 266 def __str__(self): | |
| 267 return str(self()) | |
| 268 | |
| 269 def __call__(self): | |
| 270 return self._expr(self._econtext) | |
| 271 | |
| 272 class DeferExpr: | |
| 273 def __init__(self, name, expr, compiler): | |
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274 self._s = expr = expr.lstrip() |
| 1049 | 275 self._c = compiler.compile(expr) |
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276 |
| 1049 | 277 def __call__(self, econtext): |
| 278 return DeferWrapper(self._c, econtext) | |
| 279 | |
| 280 def __repr__(self): | |
| 281 return 'defer:%s' % `self._s` | |
| 282 | |
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283 class TraversalError: |
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284 def __init__(self, path, name): |
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285 self.path = path |
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286 self.name = name |
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287 |
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288 |
| 1049 | 289 |
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290 def restrictedTraverse(object, path, securityManager, |
| 1049 | 291 get=getattr, has=hasattr, N=None, M=[], |
| 292 TupleType=type(()) ): | |
| 293 | |
| 294 REQUEST = {'path': path} | |
| 295 REQUEST['TraversalRequestNameStack'] = path = path[:] # Copy! | |
| 296 path.reverse() | |
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297 validate = securityManager.validate |
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298 __traceback_info__ = REQUEST |
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299 done = [] |
| 1049 | 300 while path: |
| 301 name = path.pop() | |
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302 __traceback_info__ = TraversalError(done, name) |
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303 |
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304 if isinstance(name, TupleType): |
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305 object = object(*name) |
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306 continue |
| 1049 | 307 |
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308 if not name: |
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309 # Skip directly to item access |
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310 o = object[name] |
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311 # Check access to the item. |
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312 if not validate(object, object, name, o): |
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313 raise Unauthorized, name |
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314 object = o |
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315 continue |
| 1049 | 316 |
| 317 # Try an attribute. | |
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318 o = guarded_getattr(object, name, M) |
| 1049 | 319 if o is M: |
| 320 # Try an item. | |
| 321 try: | |
| 322 # XXX maybe in Python 2.2 we can just check whether | |
| 323 # the object has the attribute "__getitem__" | |
| 324 # instead of blindly catching exceptions. | |
| 325 o = object[name] | |
| 326 except AttributeError, exc: | |
| 327 if str(exc).find('__getitem__') >= 0: | |
| 328 # The object does not support the item interface. | |
| 329 # Try to re-raise the original attribute error. | |
| 330 # XXX I think this only happens with | |
| 331 # ExtensionClass instances. | |
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332 guarded_getattr(object, name) |
| 1049 | 333 raise |
| 334 except TypeError, exc: | |
| 335 if str(exc).find('unsubscriptable') >= 0: | |
| 336 # The object does not support the item interface. | |
| 337 # Try to re-raise the original attribute error. | |
| 338 # XXX This is sooooo ugly. | |
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339 guarded_getattr(object, name) |
| 1049 | 340 raise |
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341 done.append((name, o)) |
| 1049 | 342 object = o |
| 343 | |
| 344 return object |