/usr/lib/python2.7/dist-packages/twisted/web/util.py is in python-twisted-web 13.2.0-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 | # -*- test-case-name: twisted.web.test.test_util -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
An assortment of web server-related utilities.
"""
__all__ = [
"redirectTo", "Redirect", "ChildRedirector", "ParentRedirect",
"DeferredResource", "htmlIndent", "FailureElement", "formatFailure"]
from cStringIO import StringIO
import linecache
import string
import types
from twisted.python.filepath import FilePath
from twisted.python.reflect import fullyQualifiedName
from twisted.python.deprecate import deprecatedModuleAttribute
from twisted.python.versions import Version
from twisted.python.modules import getModule
from twisted.web import html, resource
from twisted.web.template import (
TagLoader, XMLFile, Element, renderer, flattenString)
def redirectTo(URL, request):
"""
Generate a redirect to the given location.
@param URL: A C{str} giving the location to which to redirect.
@type URL: C{str}
@param request: The request object to use to generate the redirect.
@type request: L{IRequest<twisted.web.iweb.IRequest>} provider
@raise TypeError: If the type of C{URL} a C{unicode} instead of C{str}.
@return: A C{str} containing HTML which tries to convince the client agent
to visit the new location even if it doesn't respect the I{FOUND}
response code. This is intended to be returned from a render method,
eg::
def render_GET(self, request):
return redirectTo("http://example.com/", request)
"""
if isinstance(URL, unicode) :
raise TypeError("Unicode object not allowed as URL")
request.setHeader("content-type", "text/html; charset=utf-8")
request.redirect(URL)
return """
<html>
<head>
<meta http-equiv=\"refresh\" content=\"0;URL=%(url)s\">
</head>
<body bgcolor=\"#FFFFFF\" text=\"#000000\">
<a href=\"%(url)s\">click here</a>
</body>
</html>
""" % {'url': URL}
class Redirect(resource.Resource):
isLeaf = 1
def __init__(self, url):
resource.Resource.__init__(self)
self.url = url
def render(self, request):
return redirectTo(self.url, request)
def getChild(self, name, request):
return self
class ChildRedirector(Redirect):
isLeaf = 0
def __init__(self, url):
# XXX is this enough?
if ((url.find('://') == -1)
and (not url.startswith('..'))
and (not url.startswith('/'))):
raise ValueError("It seems you've given me a redirect (%s) that is a child of myself! That's not good, it'll cause an infinite redirect." % url)
Redirect.__init__(self, url)
def getChild(self, name, request):
newUrl = self.url
if not newUrl.endswith('/'):
newUrl += '/'
newUrl += name
return ChildRedirector(newUrl)
from twisted.python import urlpath
class ParentRedirect(resource.Resource):
"""
I redirect to URLPath.here().
"""
isLeaf = 1
def render(self, request):
return redirectTo(urlpath.URLPath.fromRequest(request).here(), request)
def getChild(self, request):
return self
class DeferredResource(resource.Resource):
"""
I wrap up a Deferred that will eventually result in a Resource
object.
"""
isLeaf = 1
def __init__(self, d):
resource.Resource.__init__(self)
self.d = d
def getChild(self, name, request):
return self
def render(self, request):
self.d.addCallback(self._cbChild, request).addErrback(
self._ebChild,request)
from twisted.web.server import NOT_DONE_YET
return NOT_DONE_YET
def _cbChild(self, child, request):
request.render(resource.getChildForRequest(child, request))
def _ebChild(self, reason, request):
request.processingFailed(reason)
return reason
stylesheet = ""
def htmlrepr(x):
return htmlReprTypes.get(type(x), htmlUnknown)(x)
def saferepr(x):
try:
rx = repr(x)
except:
rx = "<repr failed! %s instance at %s>" % (x.__class__, id(x))
return rx
def htmlUnknown(x):
return '<code>'+html.escape(saferepr(x))+'</code>'
def htmlDict(d):
io = StringIO()
w = io.write
w('<div class="dict"><span class="heading">Dictionary instance @ %s</span>' % hex(id(d)))
w('<table class="dict">')
for k, v in d.items():
if k == '__builtins__':
v = 'builtin dictionary'
w('<tr><td class="dictKey">%s</td><td class="dictValue">%s</td></tr>' % (htmlrepr(k), htmlrepr(v)))
w('</table></div>')
return io.getvalue()
def htmlList(l):
io = StringIO()
w = io.write
w('<div class="list"><span class="heading">List instance @ %s</span>' % hex(id(l)))
for i in l:
w('<div class="listItem">%s</div>' % htmlrepr(i))
w('</div>')
return io.getvalue()
def htmlInst(i):
if hasattr(i, "__html__"):
s = i.__html__()
else:
s = html.escape(saferepr(i))
return '''<div class="instance"><span class="instanceName">%s instance @ %s</span>
<span class="instanceRepr">%s</span></div>
''' % (i.__class__, hex(id(i)), s)
def htmlString(s):
return html.escape(saferepr(s))
def htmlFunc(f):
return ('<div class="function">' +
html.escape("function %s in file %s at line %s" %
(f.__name__, f.func_code.co_filename,
f.func_code.co_firstlineno))+
'</div>')
htmlReprTypes = {types.DictType: htmlDict,
types.ListType: htmlList,
types.InstanceType: htmlInst,
types.StringType: htmlString,
types.FunctionType: htmlFunc}
def htmlIndent(snippetLine):
ret = string.replace(string.replace(html.escape(string.rstrip(snippetLine)),
' ', ' '),
'\t', ' ')
return ret
class _SourceLineElement(Element):
"""
L{_SourceLineElement} is an L{IRenderable} which can render a single line of
source code.
@ivar number: A C{int} giving the line number of the source code to be
rendered.
@ivar source: A C{str} giving the source code to be rendered.
"""
def __init__(self, loader, number, source):
Element.__init__(self, loader)
self.number = number
self.source = source
@renderer
def sourceLine(self, request, tag):
"""
Render the line of source as a child of C{tag}.
"""
return tag(self.source.replace(' ', u' \N{NO-BREAK SPACE}'))
@renderer
def lineNumber(self, request, tag):
"""
Render the line number as a child of C{tag}.
"""
return tag(str(self.number))
class _SourceFragmentElement(Element):
"""
L{_SourceFragmentElement} is an L{IRenderable} which can render several lines
of source code near the line number of a particular frame object.
@ivar frame: A L{Failure<twisted.python.failure.Failure>}-style frame object
for which to load a source line to render. This is really a tuple
holding some information from a frame object. See
L{Failure.frames<twisted.python.failure.Failure>} for specifics.
"""
def __init__(self, loader, frame):
Element.__init__(self, loader)
self.frame = frame
def _getSourceLines(self):
"""
Find the source line references by C{self.frame} and yield, in source
line order, it and the previous and following lines.
@return: A generator which yields two-tuples. Each tuple gives a source
line number and the contents of that source line.
"""
filename = self.frame[1]
lineNumber = self.frame[2]
for snipLineNumber in range(lineNumber - 1, lineNumber + 2):
yield (snipLineNumber,
linecache.getline(filename, snipLineNumber).rstrip())
@renderer
def sourceLines(self, request, tag):
"""
Render the source line indicated by C{self.frame} and several
surrounding lines. The active line will be given a I{class} of
C{"snippetHighlightLine"}. Other lines will be given a I{class} of
C{"snippetLine"}.
"""
for (lineNumber, sourceLine) in self._getSourceLines():
newTag = tag.clone()
if lineNumber == self.frame[2]:
cssClass = "snippetHighlightLine"
else:
cssClass = "snippetLine"
loader = TagLoader(newTag(**{"class": cssClass}))
yield _SourceLineElement(loader, lineNumber, sourceLine)
class _FrameElement(Element):
"""
L{_FrameElement} is an L{IRenderable} which can render details about one
frame from a L{Failure<twisted.python.failure.Failure>}.
@ivar frame: A L{Failure<twisted.python.failure.Failure>}-style frame object
for which to load a source line to render. This is really a tuple
holding some information from a frame object. See
L{Failure.frames<twisted.python.failure.Failure>} for specifics.
"""
def __init__(self, loader, frame):
Element.__init__(self, loader)
self.frame = frame
@renderer
def filename(self, request, tag):
"""
Render the name of the file this frame references as a child of C{tag}.
"""
return tag(self.frame[1])
@renderer
def lineNumber(self, request, tag):
"""
Render the source line number this frame references as a child of
C{tag}.
"""
return tag(str(self.frame[2]))
@renderer
def function(self, request, tag):
"""
Render the function name this frame references as a child of C{tag}.
"""
return tag(self.frame[0])
@renderer
def source(self, request, tag):
"""
Render the source code surrounding the line this frame references,
replacing C{tag}.
"""
return _SourceFragmentElement(TagLoader(tag), self.frame)
class _StackElement(Element):
"""
L{_StackElement} renders an L{IRenderable} which can render a list of frames.
"""
def __init__(self, loader, stackFrames):
Element.__init__(self, loader)
self.stackFrames = stackFrames
@renderer
def frames(self, request, tag):
"""
Render the list of frames in this L{_StackElement}, replacing C{tag}.
"""
return [
_FrameElement(TagLoader(tag.clone()), frame)
for frame
in self.stackFrames]
class FailureElement(Element):
"""
L{FailureElement} is an L{IRenderable} which can render detailed information
about a L{Failure<twisted.python.failure.Failure>}.
@ivar failure: The L{Failure<twisted.python.failure.Failure>} instance which
will be rendered.
@since: 12.1
"""
loader = XMLFile(getModule(__name__).filePath.sibling("failure.xhtml"))
def __init__(self, failure, loader=None):
Element.__init__(self, loader)
self.failure = failure
@renderer
def type(self, request, tag):
"""
Render the exception type as a child of C{tag}.
"""
return tag(fullyQualifiedName(self.failure.type))
@renderer
def value(self, request, tag):
"""
Render the exception value as a child of C{tag}.
"""
return tag(str(self.failure.value))
@renderer
def traceback(self, request, tag):
"""
Render all the frames in the wrapped
L{Failure<twisted.python.failure.Failure>}'s traceback stack, replacing
C{tag}.
"""
return _StackElement(TagLoader(tag), self.failure.frames)
def formatFailure(myFailure):
"""
Construct an HTML representation of the given failure.
Consider using L{FailureElement} instead.
@type myFailure: L{Failure<twisted.python.failure.Failure>}
@rtype: C{str}
@return: A string containing the HTML representation of the given failure.
"""
result = []
flattenString(None, FailureElement(myFailure)).addBoth(result.append)
if isinstance(result[0], str):
# Ensure the result string is all ASCII, for compatibility with the
# default encoding expected by browsers.
return result[0].decode('utf-8').encode('ascii', 'xmlcharrefreplace')
result[0].raiseException()
_twelveOne = Version("Twisted", 12, 1, 0)
for name in ["htmlrepr", "saferepr", "htmlUnknown", "htmlString", "htmlList",
"htmlDict", "htmlInst", "htmlFunc", "htmlIndent", "htmlReprTypes",
"stylesheet"]:
deprecatedModuleAttribute(
_twelveOne, "See twisted.web.template.", __name__, name)
del name
|