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executable file
·730 lines (576 loc) · 21.9 KB
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# Copyright (c) 2000 Gregory Trubetskoy. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
#
# 3. The end-user documentation included with the redistribution, if
# any, must include the following acknowledgment: "This product
# includes software developed by Gregory Trubetskoy."
# Alternately, this acknowledgment may appear in the software itself,
# if and wherever such third-party acknowledgments normally appear.
#
# 4. The names "mod_python", "modpython" or "Gregory Trubetskoy" must not
# be used to endorse or promote products derived from this software
# without prior written permission. For written permission, please
# contact grisha@modpython.org.
#
# 5. Products derived from this software may not be called "mod_python"
# or "modpython", nor may "mod_python" or "modpython" appear in their
# names without prior written permission of Gregory Trubetskoy.
#
# THIS SOFTWARE IS PROVIDED BY GREGORY TRUBETSKOY ``AS IS'' AND ANY
# EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GREGORY TRUBETSKOY OR
# HIS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
# OF THE POSSIBILITY OF SUCH DAMAGE.
# ====================================================================
#
# $Id: apache.py,v 1.34.2.1 2002/03/23 16:48:41 gtrubetskoy Exp $
import sys
import string
import traceback
import time
import os
import pdb
import stat
import imp
import types
import _apache
# a small hack to improve PythonPath performance. This
# variable stores the last PythonPath in raw (unevaled) form.
_path = None
# this is used in Request.__init__
def _cleanup_request(_req):
_req._Request = None
class Request:
""" This is a normal Python Class that can be subclassed.
However, most of its functionality comes from a built-in
object of type mp_request provided by mod_python at
initialization and stored in self._req.
"""
def __init__(self, _req):
# look at __setattr__ if changing this line!
self._req = _req
# this will decrement the reference to the _req
# object at cleanup time. If we don't do this, we
# get a cirular reference and _req never gets destroyed.
_req.register_cleanup(_cleanup_request, _req)
def __getattr__(self, attr):
try:
return getattr(self._req, attr)
except AttributeError:
raise AttributeError, attr
def __setattr__(self, attr, val):
try:
if attr != "_req":
setattr(self._req, attr, val)
else:
self.__dict__["_req"] = val
except AttributeError:
self.__dict__[attr] = val
def __nonzero__(self):
return 1
class CallBack:
"""
A generic callback object.
"""
class HStack:
"""
The actual stack string lives in the request object so
it can be manipulated by both apache.py and mod_python.c
"""
def __init__(self, req):
self.req = req
def pop(self):
handlers = string.split(self.req.hstack)
if not handlers:
return None
else:
self.req.hstack = string.join(handlers[1:], " ")
return handlers[0]
def Dispatch(self, _req, htype):
"""
This is the handler dispatcher.
"""
# be cautious
result, handler = HTTP_INTERNAL_SERVER_ERROR, ""
# is there a Request object for this request?
if not _req._Request:
_req._Request = Request(_req)
req = _req._Request
# config
config = _req.get_config()
debug = config.has_key("PythonDebug")
try:
# cycle through the handlers
dirs = _req.get_all_dirs()
hstack = self.HStack(_req)
handler = hstack.pop()
while handler:
# split module::handler
l = string.split(handler, '::', 1)
module_name = l[0]
if len(l) == 1:
# no oject, provide default
object_str = string.lower(htype[len("python"):])
else:
object_str = l[1]
# add the direcotry to pythonpath if
# not there yet, or pythonpath specified
if config.has_key("PythonPath"):
# we want to do as little evaling as possible,
# so we remember the path in un-evaled form and
# compare it
global _path
pathstring = config["PythonPath"]
if pathstring != _path:
_path = pathstring
newpath = eval(pathstring)
if sys.path != newpath:
sys.path[:] = newpath
else:
if config.has_key("PythonHandlerModule"):
dir = _req.get_all_dirs()["PythonHandlerModule"]
else:
dir = _req.get_all_dirs()[htype]
if dir not in sys.path:
sys.path[:0] = [dir]
# import module
module = import_module(module_name, _req)
# find the object
silent = config.has_key("PythonHandlerModule")
object = resolve_object(req, module, object_str, silent)
if object:
# call the object
if config.has_key("PythonEnablePdb"):
result = pdb.runcall(object, req)
else:
result = object(req)
# stop cycling through handlers
if result != OK:
break
elif silent:
result = DECLINED
handler = hstack.pop()
except SERVER_RETURN, value:
# SERVER_RETURN indicates a non-local abort from below
# with value as (result, status) or (result, None) or result
try:
if len(value.args) == 2:
(result, status) = value.args
if status:
_req.status = status
else:
result = value.args[0]
if type(result) != type(7):
s = "Value raised with SERVER_RETURN is invalid. It is a "
s = s + "%s, but it must be a tuple or an int." % type(result)
_apache.log_error(s, APLOG_NOERRNO|APLOG_ERR, _req.server)
return HTTP_INTERNAL_SERVER_ERROR
except:
pass
except PROG_TRACEBACK, traceblock:
# Program run-time error
try:
(etype, value, traceback) = traceblock
result = self.ReportError(req, etype, value, traceback,
htype=htype, hname=handler,
debug=debug)
finally:
traceback = None
except:
# Any other rerror (usually parsing)
try:
exc_type, exc_value, exc_traceback = sys.exc_info()
result = self.ReportError(req, exc_type, exc_value, exc_traceback,
htype=htype, hname=handler, debug=debug)
finally:
exc_traceback = None
return result
def ReportError(self, req, etype, evalue, etb, htype="N/A", hname="N/A", debug=0):
"""
This function is only used when debugging is on.
It sends the output similar to what you'd see
when using Python interactively to the browser
"""
try:
if str(etype) == "exceptions.IOError" \
and str(evalue)[:5] == "Write":
# if this is an IOError while writing to client,
# it is probably better not to try to write to the cleint
# even if debug is on.
debug = 0
# write to log
for e in traceback.format_exception(etype, evalue, etb):
s = "%s %s: %s" % (htype, hname, e[:-1])
_apache.log_error(s, APLOG_NOERRNO|APLOG_ERR, req.server)
if not debug:
return HTTP_INTERNAL_SERVER_ERROR
else:
# write to client
req.content_type = 'text/plain'
req.send_http_header()
s = '\nMod_python error: "%s %s"\n\n' % (htype, hname)
for e in traceback.format_exception(etype, evalue, etb):
s = s + e + '\n'
req.write(s)
return DONE
finally:
# erase the traceback
etb = None
# we do not return anything
def import_module(module_name, req=None, path=None):
"""
Get the module to handle the request. If
autoreload is on, then the module will be reloaded
if it has changed since the last import.
"""
# Get options
debug, autoreload = 0, 1
if req:
config = req.get_config()
debug = config.has_key("PythonDebug")
if config.has_key("PythonAutoReload"):
autoreload = int(config["PythonAutoReload"])
# (Re)import
if sys.modules.has_key(module_name):
# The module has been imported already
module = sys.modules[module_name]
if autoreload:
oldmtime = module.__dict__.get("__mtime__", 0)
mtime = module_mtime(module)
else:
mtime, oldmtime = 0, 0
else:
mtime, oldmtime = 0, -1
if mtime > oldmtime:
# Import the module
if debug:
s = 'mod_python: (Re)importing %s from %s' % (module_name, path)
_apache.log_error(s, APLOG_NOERRNO|APLOG_NOTICE)
parts = string.split(module_name, '.')
for i in range(len(parts)):
f, p, d = imp.find_module(parts[i], path)
try:
mname = string.join(parts[:i+1], ".")
module = imp.load_module(mname, f, p, d)
finally:
if f: f.close()
if hasattr(module, "__path__"):
path = module.__path__
if mtime == 0:
mtime = module_mtime(module)
module.__mtime__ = mtime
return module
def module_mtime(module):
"""Get modification time of module"""
mtime = 0
if module.__dict__.has_key("__file__"):
filepath = module.__file__
try:
# this try/except block is a workaround for a Python bug in
# 2.0, 2.1 and 2.1.1. See
# http://sourceforge.net/tracker/?group_id=5470&atid=105470&func=detail&aid=422004
if os.path.exists(filepath):
mtime = os.path.getmtime(filepath)
if os.path.exists(filepath[:-1]) :
mtime = max(mtime, os.path.getmtime(filepath[:-1]))
except OSError: pass
return mtime
def resolve_object(req, module, object_str, silent=0):
"""
This function traverses the objects separated by .
(period) to find the last one we're looking for:
From left to right, find objects, if it is
an unbound method of a class, instantiate the
class passing the request as single argument
"""
obj = module
for obj_str in string.split(object_str, '.'):
parent = obj
# don't throw attribute errors when silent
if silent and not hasattr(module, obj_str):
return None
# this adds a little clarity if we have an attriute error
if obj == module and not hasattr(module, obj_str):
if hasattr(module, "__file__"):
s = "module '%s' contains no '%s'" % (module.__file__, obj_str)
raise AttributeError, s
obj = getattr(obj, obj_str)
if hasattr(obj, "im_self") and not obj.im_self:
# this is an unbound method, its class
# needs to be instantiated
instance = parent(req)
obj = getattr(instance, obj_str)
return obj
def build_cgi_env(req):
"""
Utility function that returns a dictionary of
CGI environment variables as described in
http://hoohoo.ncsa.uiuc.edu/cgi/env.html
"""
req.add_common_vars()
env = {}
for k in req.subprocess_env.keys():
env[k] = req.subprocess_env[k]
if len(req.path_info) > 0:
env["SCRIPT_NAME"] = req.uri[:-len(req.path_info)]
else:
env["SCRIPT_NAME"] = req.uri
env["GATEWAY_INTERFACE"] = "Python-CGI/1.1"
# you may want to comment this out for better security
if req.headers_in.has_key("authorization"):
env["HTTP_AUTHORIZATION"] = req.headers_in["authorization"]
return env
class NullIO:
""" Abstract IO
"""
def tell(self): return 0
def read(self, n = -1): return ""
def readline(self, length = None): return ""
def readlines(self): return []
def write(self, s): pass
def writelines(self, list):
self.write(string.joinfields(list, ''))
def isatty(self): return 0
def flush(self): pass
def close(self): pass
def seek(self, pos, mode = 0): pass
class CGIStdin(NullIO):
def __init__(self, req):
self.pos = 0
self.req = req
self.BLOCK = 65536 # 64K
# note that self.buf sometimes contains leftovers
# that were read, but not used when readline was used
self.buf = ""
def read(self, n = -1):
if n == 0:
return ""
if n == -1:
s = self.req.read(self.BLOCK)
while s:
self.buf = self.buf + s
self.pos = self.pos + len(s)
s = self.req.read(self.BLOCK)
result = self.buf
self.buf = ""
return result
else:
if self.buf:
s = self.buf[:n]
n = n - len(s)
else:
s = ""
s = s + self.req.read(n)
self.pos = self.pos + len(s)
return s
def readlines(self):
s = string.split(self.buf + self.read(), '\n')
return map(lambda s: s + '\n', s)
def readline(self, n = -1):
if n == 0:
return ""
# fill up the buffer
self.buf = self.buf + self.req.read(self.BLOCK)
# look for \n in the buffer
i = string.find(self.buf, '\n')
while i == -1: # if \n not found - read more
if (n != -1) and (len(self.buf) >= n): # we're past n
i = n - 1
break
x = len(self.buf)
self.buf = self.buf + self.req.read(self.BLOCK)
if len(self.buf) == x: # nothing read, eof
i = x - 1
break
i = string.find(self.buf, '\n', x)
# carve out the piece, then shorten the buffer
result = self.buf[:i+1]
self.buf = self.buf[i+1:]
self.pos = self.pos + len(result)
return result
class CGIStdout(NullIO):
"""
Class that allows writing to the socket directly for CGI.
"""
def __init__(self, req):
self.pos = 0
self.req = req
self.headers_sent = 0
self.headers = ""
def write(self, s):
if not s: return
if not self.headers_sent:
self.headers = self.headers + s
# are headers over yet?
headers_over = 0
# first try RFC-compliant CRLF
ss = string.split(self.headers, '\r\n\r\n', 1)
if len(ss) < 2:
# second try with \n\n
ss = string.split(self.headers, '\n\n', 1)
if len(ss) >= 2:
headers_over = 1
else:
headers_over = 1
if headers_over:
# headers done, process them
string.replace(ss[0], '\r\n', '\n')
lines = string.split(ss[0], '\n')
for line in lines:
h, v = string.split(line, ":", 1)
v = string.strip(v)
if string.lower(h) == "status":
status = int(string.split(v)[0])
self.req.status = status
elif string.lower(h) == "content-type":
self.req.content_type = v
self.req.headers_out[h] = v
else:
self.req.headers_out.add(h, v)
self.req.send_http_header()
self.headers_sent = 1
# write the body if any at this point
self.req.write(ss[1])
else:
self.req.write(str(s))
self.pos = self.pos + len(s)
def tell(self): return self.pos
def setup_cgi(req):
"""
Replace sys.stdin and stdout with an objects that read/write to
the socket, as well as substitute the os.environ.
Returns (environ, stdin, stdout) which you must save and then use
with restore_nocgi().
"""
# save env
env = os.environ.copy()
si = sys.stdin
so = sys.stdout
env = build_cgi_env(req)
for k in env.keys():
os.environ[k] = env[k]
sys.stdout = CGIStdout(req)
sys.stdin = CGIStdin(req)
sys.argv = [] # keeps cgi.py happy
return env, si, so
def restore_nocgi(env, si, so):
""" see setup_cgi() """
osenv = os.environ
# restore env
for k in osenv.keys():
del osenv[k]
for k in env.keys():
osenv[k] = env[k]
sys.stdout = si
sys.stdin = so
def init():
"""
This function is called by the server at startup time
"""
return CallBack()
## Some functions made public
make_table = _apache.make_table
log_error = _apache.log_error
parse_qs = _apache.parse_qs
parse_qsl = _apache.parse_qsl
## Some constants
HTTP_CONTINUE = 100
HTTP_SWITCHING_PROTOCOLS = 101
HTTP_PROCESSING = 102
HTTP_OK = 200
HTTP_CREATED = 201
HTTP_ACCEPTED = 202
HTTP_NON_AUTHORITATIVE = 203
HTTP_NO_CONTENT = 204
HTTP_RESET_CONTENT = 205
HTTP_PARTIAL_CONTENT = 206
HTTP_MULTI_STATUS = 207
HTTP_MULTIPLE_CHOICES = 300
HTTP_MOVED_PERMANENTLY = 301
HTTP_MOVED_TEMPORARILY = 302
HTTP_SEE_OTHER = 303
HTTP_NOT_MODIFIED = 304
HTTP_USE_PROXY = 305
HTTP_TEMPORARY_REDIRECT = 307
HTTP_BAD_REQUEST = 400
HTTP_UNAUTHORIZED = 401
HTTP_PAYMENT_REQUIRED = 402
HTTP_FORBIDDEN = 403
HTTP_NOT_FOUND = 404
HTTP_METHOD_NOT_ALLOWED = 405
HTTP_NOT_ACCEPTABLE = 406
HTTP_PROXY_AUTHENTICATION_REQUIRED= 407
HTTP_REQUEST_TIME_OUT = 408
HTTP_CONFLICT = 409
HTTP_GONE = 410
HTTP_LENGTH_REQUIRED = 411
HTTP_PRECONDITION_FAILED = 412
HTTP_REQUEST_ENTITY_TOO_LARGE = 413
HTTP_REQUEST_URI_TOO_LARGE = 414
HTTP_UNSUPPORTED_MEDIA_TYPE = 415
HTTP_RANGE_NOT_SATISFIABLE = 416
HTTP_EXPECTATION_FAILED = 417
HTTP_UNPROCESSABLE_ENTITY = 422
HTTP_LOCKED = 423
HTTP_FAILED_DEPENDENCY = 424
HTTP_INTERNAL_SERVER_ERROR = 500
HTTP_NOT_IMPLEMENTED = 501
HTTP_BAD_GATEWAY = 502
HTTP_SERVICE_UNAVAILABLE = 503
HTTP_GATEWAY_TIME_OUT = 504
HTTP_VERSION_NOT_SUPPORTED = 505
HTTP_VARIANT_ALSO_VARIES = 506
HTTP_INSUFFICIENT_STORAGE = 507
HTTP_NOT_EXTENDED = 510
# The APLOG constants in Apache are derived from syslog.h
# constants, so we do same here.
try:
import syslog
APLOG_EMERG = syslog.LOG_EMERG # system is unusable
APLOG_ALERT = syslog.LOG_ALERT # action must be taken immediately
APLOG_CRIT = syslog.LOG_CRIT # critical conditions
APLOG_ERR = syslog.LOG_ERR # error conditions
APLOG_WARNING = syslog.LOG_WARNING # warning conditions
APLOG_NOTICE = syslog.LOG_NOTICE # normal but significant condition
APLOG_INFO = syslog.LOG_INFO # informational
APLOG_DEBUG = syslog.LOG_DEBUG # debug-level messages
except ImportError:
APLOG_EMERG = 0
APLOG_ALERT = 1
APLOG_CRIT = 2
APLOG_ERR = 3
APLOG_WARNING = 4
APLOG_NOTICE = 5
APLOG_INFO = 6
APLOG_DEBUG = 7
APLOG_NOERRNO = 8
OK = REQ_PROCEED = 0
DONE = -2
DECLINED = REQ_NOACTION = -1
# constants for get_remote_host
REMOTE_HOST = 0
REMOTE_NAME = 1
REMOTE_NOLOOKUP = 2
REMOTE_DOUBLE_REV = 3
REQ_ABORTED = HTTP_INTERNAL_SERVER_ERROR
REQ_EXIT = "REQ_EXIT"
SERVER_RETURN = _apache.SERVER_RETURN
PROG_TRACEBACK = "PROG_TRACEBACK"
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