[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.
+
+			    Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
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+Foundation's software and to any other program whose authors commit to
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+  When we speak of free software, we are referring to freedom, not
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+
+		    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
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+Public License instead of this License.

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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