Mercurial > p > roundup > code
annotate roundup/cgi/PageTemplates/Expressions.py @ 3896:fca0365521fc
ignore client shutdown exceptions when sending responses
patch from Ulrik Miaelsson
If the user clicks the stop button, or click another link before
the previous has finished loading, or something similar an IOError
exception will be raised which results in the admin being sent an
email.
This can understandably be pretty annoying if your users are
doing that on a regular basis. So we'll trap that exception
and ignore it.
| author | Justus Pendleton <jpend@users.sourceforge.net> |
|---|---|
| date | Tue, 11 Sep 2007 21:30:14 +0000 |
| parents | 5f9e00836006 |
| children | 445e1bc8b1df |
| 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: | |
| 56 Unauthorized = "Unauthorized" | |
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57 |
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58 def acquisition_security_filter(orig, inst, name, v, real_validate): |
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59 if real_validate(orig, inst, name, v): |
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60 return 1 |
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61 raise Unauthorized, name |
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62 |
| 1049 | 63 def call_with_ns(f, ns, arg=1): |
| 64 if arg==2: | |
| 65 return f(None, ns) | |
| 66 else: | |
| 67 return f(ns) | |
| 68 | |
| 69 class _SecureModuleImporter: | |
| 70 """Simple version of the importer for use with trusted code.""" | |
| 71 __allow_access_to_unprotected_subobjects__ = 1 | |
| 72 def __getitem__(self, module): | |
| 73 __import__(module) | |
| 74 return sys.modules[module] | |
| 75 | |
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76 SecureModuleImporter = _SecureModuleImporter() |
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77 |
| 1049 | 78 Undefs = (Undefined, AttributeError, KeyError, |
| 79 TypeError, IndexError, Unauthorized) | |
| 80 | |
| 81 def render(ob, ns): | |
| 82 """ | |
| 83 Calls the object, possibly a document template, or just returns it if | |
| 84 not callable. (From DT_Util.py) | |
| 85 """ | |
| 86 if hasattr(ob, '__render_with_namespace__'): | |
| 87 ob = call_with_ns(ob.__render_with_namespace__, ns) | |
| 88 else: | |
| 89 base = ob | |
| 90 if callable(base): | |
| 91 try: | |
| 92 if getattr(base, 'isDocTemp', 0): | |
| 93 ob = call_with_ns(ob, ns, 2) | |
| 94 else: | |
| 95 ob = ob() | |
| 96 except AttributeError, n: | |
| 97 if str(n) != '__call__': | |
| 98 raise | |
| 99 return ob | |
| 100 | |
| 101 class SubPathExpr: | |
| 102 def __init__(self, path): | |
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103 self._path = path = path.strip().split('/') |
| 1049 | 104 self._base = base = path.pop(0) |
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105 if base and not _valid_name(base): |
| 1049 | 106 raise CompilerError, 'Invalid variable name "%s"' % base |
| 107 # Parse path | |
| 108 self._dp = dp = [] | |
| 109 for i in range(len(path)): | |
| 110 e = path[i] | |
| 111 if e[:1] == '?' and _valid_name(e[1:]): | |
| 112 dp.append((i, e[1:])) | |
| 113 dp.reverse() | |
| 114 | |
| 115 def _eval(self, econtext, | |
| 116 list=list, isinstance=isinstance, StringType=type('')): | |
| 117 vars = econtext.vars | |
| 118 path = self._path | |
| 119 if self._dp: | |
| 120 path = list(path) # Copy! | |
| 121 for i, varname in self._dp: | |
| 122 val = vars[varname] | |
| 123 if isinstance(val, StringType): | |
| 124 path[i] = val | |
| 125 else: | |
| 126 # If the value isn't a string, assume it's a sequence | |
| 127 # of path names. | |
| 128 path[i:i+1] = list(val) | |
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129 base = self._base |
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130 __traceback_info__ = 'path expression "%s"'%('/'.join(self._path)) |
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131 if base == 'CONTEXTS' or not base: |
| 1049 | 132 ob = econtext.contexts |
| 133 else: | |
| 134 ob = vars[base] | |
| 135 if isinstance(ob, DeferWrapper): | |
| 136 ob = ob() | |
| 137 if path: | |
| 138 ob = restrictedTraverse(ob, path, getSecurityManager()) | |
| 139 return ob | |
| 140 | |
| 141 class PathExpr: | |
| 142 def __init__(self, name, expr, engine): | |
| 143 self._s = expr | |
| 144 self._name = name | |
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145 self._hybrid = 0 |
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146 paths = expr.split('|') |
| 1049 | 147 self._subexprs = [] |
| 148 add = self._subexprs.append | |
| 149 for i in range(len(paths)): | |
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150 path = paths[i].lstrip() |
| 1049 | 151 if _parse_expr(path): |
| 152 # This part is the start of another expression type, | |
| 153 # so glue it back together and compile it. | |
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154 add(engine.compile(('|'.join(paths[i:]).lstrip()))) |
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155 self._hybrid = 1 |
| 1049 | 156 break |
| 157 add(SubPathExpr(path)._eval) | |
| 158 | |
| 159 def _exists(self, econtext): | |
| 160 for expr in self._subexprs: | |
| 161 try: | |
| 162 expr(econtext) | |
| 163 except Undefs: | |
| 164 pass | |
| 165 else: | |
| 166 return 1 | |
| 167 return 0 | |
| 168 | |
| 169 def _eval(self, econtext, | |
| 170 isinstance=isinstance, StringType=type(''), render=render): | |
| 171 for expr in self._subexprs[:-1]: | |
| 172 # Try all but the last subexpression, skipping undefined ones. | |
| 173 try: | |
| 174 ob = expr(econtext) | |
| 175 except Undefs: | |
| 176 pass | |
| 177 else: | |
| 178 break | |
| 179 else: | |
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180 # On the last subexpression allow exceptions through, and |
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181 # don't autocall if the expression was not a subpath. |
| 1049 | 182 ob = self._subexprs[-1](econtext) |
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183 if self._hybrid: |
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184 return ob |
| 1049 | 185 |
| 186 if self._name == 'nocall' or isinstance(ob, StringType): | |
| 187 return ob | |
| 188 # Return the rendered object | |
| 189 return render(ob, econtext.vars) | |
| 190 | |
| 191 def __call__(self, econtext): | |
| 192 if self._name == 'exists': | |
| 193 return self._exists(econtext) | |
| 194 return self._eval(econtext) | |
| 195 | |
| 196 def __str__(self): | |
| 197 return '%s expression %s' % (self._name, `self._s`) | |
| 198 | |
| 199 def __repr__(self): | |
| 200 return '%s:%s' % (self._name, `self._s`) | |
| 201 | |
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202 |
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203 _interp = re.compile(r'\$(%(n)s)|\${(%(n)s(?:/[^}]*)*)}' % {'n': NAME_RE}) |
| 1049 | 204 |
| 205 class StringExpr: | |
| 206 def __init__(self, name, expr, engine): | |
| 207 self._s = expr | |
| 208 if '%' in expr: | |
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209 expr = expr.replace('%', '%%') |
| 1049 | 210 self._vars = vars = [] |
| 211 if '$' in expr: | |
| 212 parts = [] | |
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213 for exp in expr.split('$$'): |
| 1049 | 214 if parts: parts.append('$') |
| 215 m = _interp.search(exp) | |
| 216 while m is not None: | |
| 217 parts.append(exp[:m.start()]) | |
| 218 parts.append('%s') | |
| 219 vars.append(PathExpr('path', m.group(1) or m.group(2), | |
| 220 engine)) | |
| 221 exp = exp[m.end():] | |
| 222 m = _interp.search(exp) | |
| 223 if '$' in exp: | |
| 224 raise CompilerError, ( | |
| 225 '$ must be doubled or followed by a simple path') | |
| 226 parts.append(exp) | |
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227 expr = ''.join(parts) |
| 1049 | 228 self._expr = expr |
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229 |
| 1049 | 230 def __call__(self, econtext): |
| 231 vvals = [] | |
| 232 for var in self._vars: | |
| 233 v = var(econtext) | |
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234 # I hope this isn't in use anymore. |
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235 ## if isinstance(v, Exception): |
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236 ## raise v |
| 1049 | 237 vvals.append(v) |
| 238 return self._expr % tuple(vvals) | |
| 239 | |
| 240 def __str__(self): | |
| 241 return 'string expression %s' % `self._s` | |
| 242 | |
| 243 def __repr__(self): | |
| 244 return 'string:%s' % `self._s` | |
| 245 | |
| 246 class NotExpr: | |
| 247 def __init__(self, name, expr, compiler): | |
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248 self._s = expr = expr.lstrip() |
| 1049 | 249 self._c = compiler.compile(expr) |
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250 |
| 1049 | 251 def __call__(self, econtext): |
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252 # We use the (not x) and 1 or 0 formulation to avoid changing |
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253 # the representation of the result in Python 2.3, where the |
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254 # result of "not" becomes an instance of bool. |
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255 return (not econtext.evaluateBoolean(self._c)) and 1 or 0 |
| 1049 | 256 |
| 257 def __repr__(self): | |
| 258 return 'not:%s' % `self._s` | |
| 259 | |
| 260 class DeferWrapper: | |
| 261 def __init__(self, expr, econtext): | |
| 262 self._expr = expr | |
| 263 self._econtext = econtext | |
| 264 | |
| 265 def __str__(self): | |
| 266 return str(self()) | |
| 267 | |
| 268 def __call__(self): | |
| 269 return self._expr(self._econtext) | |
| 270 | |
| 271 class DeferExpr: | |
| 272 def __init__(self, name, expr, compiler): | |
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273 self._s = expr = expr.lstrip() |
| 1049 | 274 self._c = compiler.compile(expr) |
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275 |
| 1049 | 276 def __call__(self, econtext): |
| 277 return DeferWrapper(self._c, econtext) | |
| 278 | |
| 279 def __repr__(self): | |
| 280 return 'defer:%s' % `self._s` | |
| 281 | |
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282 class TraversalError: |
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283 def __init__(self, path, name): |
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284 self.path = path |
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285 self.name = name |
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286 |
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287 |
| 1049 | 288 |
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289 def restrictedTraverse(object, path, securityManager, |
| 1049 | 290 get=getattr, has=hasattr, N=None, M=[], |
| 291 TupleType=type(()) ): | |
| 292 | |
| 293 REQUEST = {'path': path} | |
| 294 REQUEST['TraversalRequestNameStack'] = path = path[:] # Copy! | |
| 295 path.reverse() | |
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296 validate = securityManager.validate |
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297 __traceback_info__ = REQUEST |
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298 done = [] |
| 1049 | 299 while path: |
| 300 name = path.pop() | |
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301 __traceback_info__ = TraversalError(done, name) |
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302 |
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303 if isinstance(name, TupleType): |
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304 object = object(*name) |
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305 continue |
| 1049 | 306 |
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307 if not name: |
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308 # Skip directly to item access |
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309 o = object[name] |
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310 # Check access to the item. |
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311 if not validate(object, object, name, o): |
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312 raise Unauthorized, name |
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313 object = o |
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314 continue |
| 1049 | 315 |
| 316 # Try an attribute. | |
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317 o = guarded_getattr(object, name, M) |
| 1049 | 318 if o is M: |
| 319 # Try an item. | |
| 320 try: | |
| 321 # XXX maybe in Python 2.2 we can just check whether | |
| 322 # the object has the attribute "__getitem__" | |
| 323 # instead of blindly catching exceptions. | |
| 324 o = object[name] | |
| 325 except AttributeError, exc: | |
| 326 if str(exc).find('__getitem__') >= 0: | |
| 327 # The object does not support the item interface. | |
| 328 # Try to re-raise the original attribute error. | |
| 329 # XXX I think this only happens with | |
| 330 # ExtensionClass instances. | |
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331 guarded_getattr(object, name) |
| 1049 | 332 raise |
| 333 except TypeError, exc: | |
| 334 if str(exc).find('unsubscriptable') >= 0: | |
| 335 # The object does not support the item interface. | |
| 336 # Try to re-raise the original attribute error. | |
| 337 # XXX This is sooooo ugly. | |
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338 guarded_getattr(object, name) |
| 1049 | 339 raise |
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340 done.append((name, o)) |
| 1049 | 341 object = o |
| 342 | |
| 343 return object |