[Inteproxy-commits] r1 - /
scm-commit@wald.intevation.org
scm-commit at wald.intevation.org
Mon Oct 30 16:51:39 CET 2006
Author: jan
Date: 2006-10-30 16:51:39 +0100 (Mon, 30 Oct 2006)
New Revision: 1
Added:
COPYING
InteProxy.py
Log:
Initial import
Added: COPYING
===================================================================
--- COPYING 2006-10-17 11:45:02 UTC (rev 0)
+++ COPYING 2006-10-30 15:51:39 UTC (rev 1)
@@ -0,0 +1,340 @@
+ GNU GENERAL PUBLIC LICENSE
+ Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
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+ TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
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Added: InteProxy.py
===================================================================
--- InteProxy.py 2006-10-17 11:45:02 UTC (rev 0)
+++ InteProxy.py 2006-10-30 15:51:39 UTC (rev 1)
@@ -0,0 +1,350 @@
+#! /usr/bin/python
+# Copyright (C) 2006 by Intevation GmbH
+# Authors:
+# Bernhard Herzog <bh at intevation.de>
+#
+# This program is free software under the GPL (>=v2)
+# Read the file COPYING coming with the software for details.
+
+"""A HTTP server that translates http into https
+
+Usage:
+
+python InteProxy.py
+"""
+
+import sys
+import optparse
+import traceback
+import time
+import urlparse
+import urllib2
+import BaseHTTPServer
+import threading
+import Queue
+import socket
+
+try:
+ import pywin.dialogs.login
+ windowsystem = "pywin"
+except ImportError:
+ windowsystem = "crt"
+
+
+def getpassword_pywin(title):
+ return pywin.dialogs.login.GetLogin(title)
+
+def getpassword_crt(title):
+ import getpass
+ try:
+ user = raw_input(title)
+ password = getpass.getpass()
+ except IOError:
+ import traceback
+ traceback.print_exception()
+ user = password = None
+ return user, password
+
+getpassword = globals()["getpassword_" + windowsystem]
+
+# the central queue for the communication between master and worker
+# thread.
+the_queue = Queue.Queue(0)
+
+def worker_thread():
+ """The worker thread
+
+ This function takes requests out of the queue and handles them.
+ """
+ while 1:
+ request = the_queue.get()
+ request()
+
+
+class InteProxyHTTPRequestHandler(BaseHTTPServer.BaseHTTPRequestHandler):
+
+ # Whether the SHUTDOWN method is allowed. If allowed, anybody who can
+ # connect to the server can shutdown the server.
+ allow_shutdown = False
+
+ def do_SHUTDOWN(self):
+ """Shutdown the server if self.allow_shutdown is True (default False).
+
+ To shutdown the server, this method calls the server's
+ server_close method.
+ """
+ if self.allow_shutdown:
+ self.server.server_close()
+ self.send_response(200)
+ # somewhat ugly hack: connect to this server, to unblock the
+ # accept call.
+ s = socket.socket(socket.AF_INET)
+ s.connect(("localhost", self.server.server_port))
+ s.close()
+ else:
+ self.send_error(400)
+
+ def do_GET(self):
+ """Handle a GET request"""
+ self.handle_proxy_request("GET")
+
+ def do_POST(self):
+ """Handle a POST request"""
+ self.handle_proxy_request("POST")
+
+ def handle_proxy_request(self, method):
+ """Handle a request that needs to be 'proxied'
+
+ Method should be either 'POST' or 'GET'. Both methods are
+ handled in the same way. The real host to connect to is
+ determined from the url: The path component starts with the real
+ hostname. The method strips that hostname from the path and
+ connects to the new host. All headers from the HTTP request and
+ any extra data are passed through to the remote host and the
+ reponse is likewise simply copied through. The only exception
+ is the Host: header from the original request. It would be
+ wrong, so it is removed and a new one is generated pointing to
+ the real remote host.
+ """
+ netloc, url = self.convert_url(self.path)
+
+ #
+ # Create a http request for the real location
+ #
+ request = urllib2.Request("https://%s/%s" % (netloc, url))
+ for header, value in self.headers.items():
+ if header.lower() == "host":
+ # the host header will be set by httplib and it should
+ # not be set twice, so we omit it. The value we
+ # received from the client would have been wrong anyway
+ # as it refers to the host this proxy is running on.
+ continue
+ elif header.lower() in ("content-length", "content-type"):
+ # When a post request is redirected with the 302 code,
+ # urllib2 will do a GET request for the new url even
+ # when the original request was POST. This does not
+ # conform to RFC 2616, but it's apparently what many
+ # clients do and some servers expect (e.g. a POST
+ # request to http://intevation.de/roundup/kolab/ is
+ # redirected to
+ # https://intevation.de/roundup/kolab/issue<num> and the
+ # server expects a GET request for that.). However,
+ # when doing the new request urllib2 copies all headers
+ # except for those added with add_unredirected_header.
+ # The content-length and content-type headers are only
+ # needed for POST request so we have to make sure
+ # they're not send when redirection occurs.
+ request.add_unredirected_header(header, value)
+ else:
+ request.add_header(header, value)
+
+ # If any data is associated with the request pass it through
+ length = int(self.headers.getheader("Content-Length", "0"))
+ if length:
+ # FIXME: check whether length bytes were read
+ request.add_data(self.rfile.read(length))
+
+ #
+ # Retrieve the url described by the request and pass everything
+ # through to the client.
+ #
+ try:
+ response = urllib2.urlopen(request)
+ except urllib2.HTTPError, err:
+ # a HTTPError is a valid http response object, so we can
+ # treat it like a normal response.
+ response = err
+ self.send_response(response.code, response.msg)
+ for header, value in response.info().items():
+ self.send_header(header, value)
+ self.end_headers()
+
+ transfer_encoding = response.info().get("Transfer-encoding")
+ self.transfer_data(response.read, self.wfile.write,
+ chunked = (transfer_encoding == "chunked"))
+
+ def transfer_data(self, read, write, length=None, chunked=False):
+ """Transfer data from one 'file' to another in chunks
+
+ The files are given by their read and write methods so it
+ doesn't have to be a file. The read parameter must be callable
+ with an integer argument indicating the maximum number of bytes
+ to read and the write parameter must be callable with a string.
+ If the parameter chunked is true, the method uses the 'chunked'
+ transfer encoding when writing the data.
+ """
+ max_chunk_size = 4096
+ while 1:
+ if length is not None:
+ chunk_size = min(length, max_chunk_size)
+ else:
+ chunk_size = max_chunk_size
+ chunk = read(chunk_size)
+ if not chunk:
+ break
+ if length is not None:
+ length -= len(chunk)
+ if chunked:
+ write("%x\r\n" % len(chunk))
+ write(chunk)
+ if chunked:
+ write("\r\n")
+ if chunked:
+ write("0\r\n\r\n")
+
+ def convert_url(self, url):
+ """Extract the real host from the url and return host and new url
+
+ The URL parameter is the part of the URL from the GET or POST
+ request which is actually only the path, query and fragment in
+ the terminology of the urlparse module. For the InteProxy, the
+ first component in the path is the actual host to connect to.
+ This method extracts that part and creates a new path with that
+ part removed. The return value of this method is the tuple
+ (real_host, new_url) where new_url is the combined new path and
+ the original query and fragment parts.
+ """
+ scheme, netloc, path, query, fragment = urlparse.urlsplit(url)
+
+ # both scheme and netloc must be empty strings because the url
+ # we work with is the url on the first line of a HTTP request
+ # which doesn't include them
+ assert scheme == ""
+ assert netloc == ""
+
+ split_path = path.split("/")
+ if not split_path[0]:
+ del split_path[0]
+ real_netloc = split_path.pop(0)
+ real_path = "/" + "/".join(split_path)
+ return real_netloc, urlparse.urlunsplit(("", "", real_path, query,
+ fragment))
+
+ def log_exception(self, exc_info):
+ """Log an exception
+
+ This method produces a log message via self.log_message and then
+ prints a the exception given by exc_info, which should be the
+ return value of sys.exc_info, to stderr. By default log_message
+ also writes to stderr, so both the message and the traceback
+ should go to the same place.
+ """
+ self.log_message("Exception for previous 500 code\n")
+ traceback.print_exception(*(exc_info + (None, sys.stderr)))
+ sys.stderr.flush()
+
+
+# same as the BaseHTTPRequestHandler method, but as a standalone function:
+def log_date_time_string():
+ """Return the current time formatted for logging."""
+ now = time.time()
+ year, month, day, hh, mm, ss, x, y, z = time.localtime(now)
+ s = "%02d/%3s/%04d %02d:%02d:%02d" % (
+ day, BaseHTTPServer.BaseHTTPRequestHandler.monthname[month],
+ year, hh, mm, ss)
+ return s
+
+
+class MasterWorkerServer(BaseHTTPServer.HTTPServer):
+
+ do_shutdown = False
+
+ def serve_forever(self):
+ """Handle requests until self.do_shutdown is True."""
+ while not self.do_shutdown:
+ self.handle_request()
+
+ def server_close(self):
+ """Shutdown the server.
+
+ Usually this is called from a thread while another thread
+ executes the server_forever method. In that case the other
+ thread is most likely blocked while listening for new
+ connections. After this method returns, the caller will have to
+ do something to unblock the other thread, such as creating a TCP
+ connection to the server.
+ """
+ BaseHTTPServer.HTTPServer.server_close(self)
+ self.do_shutdown = True
+
+ def process_request(self, request, client_address):
+ """Put the request into the queue to be handled by the worker thread
+ """
+ def process_in_worker():
+ try:
+ self.finish_request(request, client_address)
+ self.close_request(request)
+ except:
+ self.handle_error(request, client_address)
+ self.close_request(request)
+ sys.stderr.write("[%s] queue contains %d items\n" %
+ (log_date_time_string(), the_queue.qsize()))
+ the_queue.put(process_in_worker)
+
+ def handle_error(self, request, client_address):
+ """Override to integrate the error reporting better with the other logs
+ """
+ sys.stderr.write("[%s] Exception while handling request from %r\n"
+ % (log_date_time_string(), client_address))
+ traceback.print_exception(*(sys.exc_info() + (None, sys.stderr)))
+ sys.stderr.flush()
+
+
+class IntePasswordManager(urllib2.HTTPPasswordMgr):
+
+ def find_user_password(self, realm, authuri):
+ user, password \
+ = urllib2.HTTPPasswordMgr.find_user_password(self, realm, authuri)
+ if user is None:
+ # no password known yet. Ask the user
+ authuri = "https://" + "".join(self.reduce_uri(authuri))
+ title = "Username for %r realm %r: " % (authuri, realm)
+ user, password = getpassword(title)
+ return user, password
+
+def setup_urllib2():
+ auth_handler = urllib2.HTTPBasicAuthHandler(IntePasswordManager())
+ httphandler = urllib2.HTTPHandler()
+ opener = urllib2.build_opener(auth_handler, httphandler)
+ urllib2.install_opener(opener)
+
+
+def run_server(HandlerClass = InteProxyHTTPRequestHandler,
+ ServerClass = MasterWorkerServer):
+ """Run the InteProxy server"""
+ parser = optparse.OptionParser()
+ parser.set_defaults(port=64609)
+ parser.add_option("--logfile")
+ parser.add_option("--allow-shutdown", action="store_true")
+ parser.add_option("--port", type="int")
+ opts, rest = parser.parse_args()
+
+ HandlerClass.allow_shutdown = opts.allow_shutdown
+
+ setup_urllib2()
+
+ server_address = ('localhost', opts.port)
+
+ if opts.logfile:
+ sys.stderr = open(opts.logfile, "a", 0)
+
+ sys.stderr.write("[%s] server starting up\n" % log_date_time_string())
+
+ httpd = ServerClass(server_address, HandlerClass)
+
+ sys.stderr.write("[%s] starting worker thread\n" % log_date_time_string())
+ worker = threading.Thread(target = worker_thread)
+ worker.setDaemon(1)
+ worker.start()
+
+ print "Serving HTTP on port", opts.port, "..."
+ sys.stderr.write("[%s] serving HTTP on port %d\n"
+ % (log_date_time_string(), opts.port))
+ httpd.serve_forever()
+ logmessage = "[%s] server stopped" % (log_date_time_string(),)
+ print logmessage
+ sys.stderr.write(logmessage + "\n")
+
+
+if __name__ == '__main__':
+ run_server()
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