/usr/lib/python2.7/dist-packages/twisted/web/twcgi.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 | # -*- test-case-name: twisted.web.test.test_cgi -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
I hold resource classes and helper classes that deal with CGI scripts.
"""
# System Imports
import string
import os
import urllib
# Twisted Imports
from twisted.web import http
from twisted.internet import reactor, protocol
from twisted.spread import pb
from twisted.python import log, filepath
from twisted.web import resource, server, static
class CGIDirectory(resource.Resource, filepath.FilePath):
def __init__(self, pathname):
resource.Resource.__init__(self)
filepath.FilePath.__init__(self, pathname)
def getChild(self, path, request):
fnp = self.child(path)
if not fnp.exists():
return static.File.childNotFound
elif fnp.isdir():
return CGIDirectory(fnp.path)
else:
return CGIScript(fnp.path)
return resource.NoResource()
def render(self, request):
notFound = resource.NoResource(
"CGI directories do not support directory listing.")
return notFound.render(request)
class CGIScript(resource.Resource):
"""
L{CGIScript} is a resource which runs child processes according to the CGI
specification.
The implementation is complex due to the fact that it requires asynchronous
IPC with an external process with an unpleasant protocol.
"""
isLeaf = 1
def __init__(self, filename, registry=None):
"""
Initialize, with the name of a CGI script file.
"""
self.filename = filename
def render(self, request):
"""
Do various things to conform to the CGI specification.
I will set up the usual slew of environment variables, then spin off a
process.
@type request: L{twisted.web.http.Request}
@param request: An HTTP request.
"""
script_name = "/"+string.join(request.prepath, '/')
serverName = string.split(request.getRequestHostname(), ':')[0]
env = {"SERVER_SOFTWARE": server.version,
"SERVER_NAME": serverName,
"GATEWAY_INTERFACE": "CGI/1.1",
"SERVER_PROTOCOL": request.clientproto,
"SERVER_PORT": str(request.getHost().port),
"REQUEST_METHOD": request.method,
"SCRIPT_NAME": script_name, # XXX
"SCRIPT_FILENAME": self.filename,
"REQUEST_URI": request.uri,
}
client = request.getClient()
if client is not None:
env['REMOTE_HOST'] = client
ip = request.getClientIP()
if ip is not None:
env['REMOTE_ADDR'] = ip
pp = request.postpath
if pp:
env["PATH_INFO"] = "/"+string.join(pp, '/')
if hasattr(request, "content"):
# request.content is either a StringIO or a TemporaryFile, and
# the file pointer is sitting at the beginning (seek(0,0))
request.content.seek(0,2)
length = request.content.tell()
request.content.seek(0,0)
env['CONTENT_LENGTH'] = str(length)
qindex = string.find(request.uri, '?')
if qindex != -1:
qs = env['QUERY_STRING'] = request.uri[qindex+1:]
if '=' in qs:
qargs = []
else:
qargs = [urllib.unquote(x) for x in qs.split('+')]
else:
env['QUERY_STRING'] = ''
qargs = []
# Propogate HTTP headers
for title, header in request.getAllHeaders().items():
envname = string.upper(string.replace(title, '-', '_'))
if title not in ('content-type', 'content-length'):
envname = "HTTP_" + envname
env[envname] = header
# Propogate our environment
for key, value in os.environ.items():
if key not in env:
env[key] = value
# And they're off!
self.runProcess(env, request, qargs)
return server.NOT_DONE_YET
def runProcess(self, env, request, qargs=[]):
"""
Run the cgi script.
@type env: A C{dict} of C{str}, or C{None}
@param env: The environment variables to pass to the processs that will
get spawned. See
L{twisted.internet.interfaces.IReactorProcess.spawnProcess} for more
information about environments and process creation.
@type request: L{twisted.web.http.Request}
@param request: An HTTP request.
@type qargs: A C{list} of C{str}
@param qargs: The command line arguments to pass to the process that
will get spawned.
"""
p = CGIProcessProtocol(request)
reactor.spawnProcess(p, self.filename, [self.filename] + qargs, env,
os.path.dirname(self.filename))
class FilteredScript(CGIScript):
"""
I am a special version of a CGI script, that uses a specific executable.
This is useful for interfacing with other scripting languages that adhere to
the CGI standard. My C{filter} attribute specifies what executable to run,
and my C{filename} init parameter describes which script to pass to the
first argument of that script.
To customize me for a particular location of a CGI interpreter, override
C{filter}.
@type filter: C{str}
@ivar filter: The absolute path to the executable.
"""
filter = '/usr/bin/cat'
def runProcess(self, env, request, qargs=[]):
"""
Run a script through the C{filter} executable.
@type env: A C{dict} of C{str}, or C{None}
@param env: The environment variables to pass to the processs that will
get spawned. See
L{twisted.internet.interfaces.IReactorProcess.spawnProcess} for more
information about environments and process creation.
@type request: L{twisted.web.http.Request}
@param request: An HTTP request.
@type qargs: A C{list} of C{str}
@param qargs: The command line arguments to pass to the process that
will get spawned.
"""
p = CGIProcessProtocol(request)
reactor.spawnProcess(p, self.filter,
[self.filter, self.filename] + qargs, env,
os.path.dirname(self.filename))
class CGIProcessProtocol(protocol.ProcessProtocol, pb.Viewable):
handling_headers = 1
headers_written = 0
headertext = ''
errortext = ''
# Remotely relay producer interface.
def view_resumeProducing(self, issuer):
self.resumeProducing()
def view_pauseProducing(self, issuer):
self.pauseProducing()
def view_stopProducing(self, issuer):
self.stopProducing()
def resumeProducing(self):
self.transport.resumeProducing()
def pauseProducing(self):
self.transport.pauseProducing()
def stopProducing(self):
self.transport.loseConnection()
def __init__(self, request):
self.request = request
def connectionMade(self):
self.request.registerProducer(self, 1)
self.request.content.seek(0, 0)
content = self.request.content.read()
if content:
self.transport.write(content)
self.transport.closeStdin()
def errReceived(self, error):
self.errortext = self.errortext + error
def outReceived(self, output):
"""
Handle a chunk of input
"""
# First, make sure that the headers from the script are sorted
# out (we'll want to do some parsing on these later.)
if self.handling_headers:
text = self.headertext + output
headerEnds = []
for delimiter in '\n\n','\r\n\r\n','\r\r', '\n\r\n':
headerend = text.find(delimiter)
if headerend != -1:
headerEnds.append((headerend, delimiter))
if headerEnds:
# The script is entirely in control of response headers; disable the
# default Content-Type value normally provided by
# twisted.web.server.Request.
self.request.defaultContentType = None
headerEnds.sort()
headerend, delimiter = headerEnds[0]
self.headertext = text[:headerend]
# This is a final version of the header text.
linebreak = delimiter[:len(delimiter)//2]
headers = self.headertext.split(linebreak)
for header in headers:
br = header.find(': ')
if br == -1:
log.msg( 'ignoring malformed CGI header: %s' % header )
else:
headerName = header[:br].lower()
headerText = header[br+2:]
if headerName == 'location':
self.request.setResponseCode(http.FOUND)
if headerName == 'status':
try:
statusNum = int(headerText[:3]) #"XXX <description>" sometimes happens.
except:
log.msg( "malformed status header" )
else:
self.request.setResponseCode(statusNum)
else:
# Don't allow the application to control these required headers.
if headerName.lower() not in ('server', 'date'):
self.request.responseHeaders.addRawHeader(headerName, headerText)
output = text[headerend+len(delimiter):]
self.handling_headers = 0
if self.handling_headers:
self.headertext = text
if not self.handling_headers:
self.request.write(output)
def processEnded(self, reason):
if reason.value.exitCode != 0:
log.msg("CGI %s exited with exit code %s" %
(self.request.uri, reason.value.exitCode))
if self.errortext:
log.msg("Errors from CGI %s: %s" % (self.request.uri, self.errortext))
if self.handling_headers:
log.msg("Premature end of headers in %s: %s" % (self.request.uri, self.headertext))
self.request.write(
resource.ErrorPage(http.INTERNAL_SERVER_ERROR,
"CGI Script Error",
"Premature end of script headers.").render(self.request))
self.request.unregisterProducer()
self.request.finish()
|