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connections.py
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# # Connection objects # # Copyright (c) 2002--2013 Red Hat, Inc. # # Author: Mihai Ibanescu <misa@redhat.com> # $Id$ import sys import base64 import SSL import nonblocking import httplib import xmlrpclib import encodings.idna import socket from platform import python_version # Import into the local namespace some httplib-related names from httplib import _CS_REQ_SENT, _CS_IDLE, ResponseNotReady class HTTPResponse(httplib.HTTPResponse): def set_callback(self, rs, ws, ex, user_data, callback): if not isinstance(self.fp, nonblocking.NonBlockingFile): self.fp = nonblocking.NonBlockingFile(self.fp) self.fp.set_callback(rs, ws, ex, user_data, callback) class HTTPConnection(httplib.HTTPConnection): response_class = HTTPResponse def __init__(self, host, port=None, timeout=SSL.DEFAULT_TIMEOUT): if python_version() >= '2.6.1': httplib.HTTPConnection.__init__(self, host, port, timeout=timeout) else: httplib.HTTPConnection.__init__(self, host, port) self._cb_rs = [] self._cb_ws = [] self._cb_ex = [] self._cb_user_data = None self._cb_callback = None self._user_agent = "rhn.connections $Revision$ (python)" self.timeout = timeout def set_callback(self, rs, ws, ex, user_data, callback): # XXX check the params self._cb_rs = rs self._cb_ws = ws self._cb_ex = ex self._cb_user_data = user_data self._cb_callback = callback def set_user_agent(self, user_agent): self._user_agent = user_agent # XXX Had to copy the function from httplib.py, because the nonblocking # framework had to be initialized def getresponse(self): "Get the response from the server." # check if a prior response has been completed if self.__response and self.__response.isclosed(): self.__response = None # # if a prior response exists, then it must be completed (otherwise, we # cannot read this response's header to determine the connection-close # behavior) # # note: if a prior response existed, but was connection-close, then the # socket and response were made independent of this HTTPConnection # object since a new request requires that we open a whole new # connection # # this means the prior response had one of two states: # 1) will_close: this connection was reset and the prior socket and # response operate independently # 2) persistent: the response was retained and we await its # isclosed() status to become true. # if self.__state != _CS_REQ_SENT or self.__response: raise ResponseNotReady() if self.debuglevel > 0: response = self.response_class(self.sock, self.debuglevel) else: response = self.response_class(self.sock) # The only modification compared to the stock HTTPConnection if self._cb_callback: response.set_callback(self._cb_rs, self._cb_ws, self._cb_ex, self._cb_user_data, self._cb_callback) response.begin() assert response.will_close != httplib._UNKNOWN self.__state = _CS_IDLE if response.will_close: # this effectively passes the connection to the response self.close() else: # remember this, so we can tell when it is complete self.__response = response return response def connect(self): httplib.HTTPConnection.connect(self) self.sock.settimeout(self.timeout) class HTTPProxyConnection(HTTPConnection): def __init__(self, proxy, host, port=None, username=None, password=None, timeout=SSL.DEFAULT_TIMEOUT): # The connection goes through the proxy HTTPConnection.__init__(self, proxy, timeout=timeout) # save the proxy values self.__proxy, self.__proxy_port = self.host, self.port # self.host and self.port will point to the real host self._set_hostport(host, port) # save the host and port self._host, self._port = self.host, self.port # Authenticated proxies support self.__username = username self.__password = password def connect(self): # We are actually connecting to the proxy self._set_hostport(self.__proxy, self.__proxy_port) HTTPConnection.connect(self) # Restore the real host and port self._set_hostport(self._host, self._port) def putrequest(self, method, url, skip_host=0): # The URL has to include the real host hostname = self._host if self._port != self.default_port: hostname = hostname + ':' + str(self._port) newurl = "http://%s%s" % (hostname, url) # Piggyback on the parent class HTTPConnection.putrequest(self, method, newurl, skip_host=skip_host) # Add proxy-specific headers self._add_proxy_headers() def _add_proxy_headers(self): if not self.__username: return # Authenticated proxy userpass = "%s:%s" % (self.__username, self.__password) enc_userpass = base64.encodestring(userpass).replace("\n", "") self.putheader("Proxy-Authorization", "Basic %s" % enc_userpass) class HTTPSConnection(HTTPConnection): response_class = HTTPResponse default_port = httplib.HTTPSConnection.default_port def __init__(self, host, port=None, trusted_certs=None, timeout=SSL.DEFAULT_TIMEOUT): HTTPConnection.__init__(self, host, port, timeout=timeout) trusted_certs = trusted_certs or [] self.trusted_certs = trusted_certs def connect(self): "Connect to a host on a given (SSL) port" results = socket.getaddrinfo(self.host, self.port, socket.AF_UNSPEC, socket.SOCK_STREAM) for r in results: af, socktype, proto, canonname, sa = r try: sock = socket.socket(af, socktype, proto) except socket.error, msg: sock = None continue try: sock.connect((self.host, self.port)) sock.settimeout(self.timeout) except socket.error, e: sock.close() sock = None continue break if sock is None: raise socket.error("Unable to connect to the host and port specified") self.sock = SSL.SSLSocket(sock, self.trusted_certs) self.sock.init_ssl() class HTTPSProxyResponse(HTTPResponse): def begin(self): HTTPResponse.begin(self) self.will_close = 0 class HTTPSProxyConnection(HTTPProxyConnection): default_port = HTTPSConnection.default_port def __init__(self, proxy, host, port=None, username=None, password=None, trusted_certs=None, timeout=SSL.DEFAULT_TIMEOUT): HTTPProxyConnection.__init__(self, proxy, host, port, username, password, timeout=timeout) trusted_certs = trusted_certs or [] self.trusted_certs = trusted_certs def connect(self): # Set the connection with the proxy HTTPProxyConnection.connect(self) # Use the stock HTTPConnection putrequest host = "%s:%s" % (self._host, self._port) HTTPConnection.putrequest(self, "CONNECT", host) # Add proxy-specific stuff self._add_proxy_headers() # And send the request HTTPConnection.endheaders(self) # Save the response class response_class = self.response_class # And replace the response class with our own one, which does not # close the connection after self.response_class = HTTPSProxyResponse response = HTTPConnection.getresponse(self) # Restore the response class self.response_class = response_class # Close the response object manually response.close() if response.status != 200: # Close the connection manually self.close() raise xmlrpclib.ProtocolError(host, response.status, response.reason, response.msg) self.sock = SSL.SSLSocket(self.sock, self.trusted_certs) self.sock.init_ssl() def putrequest(self, method, url, skip_host=0): return HTTPConnection.putrequest(self, method, url, skip_host=skip_host) def _add_proxy_headers(self): HTTPProxyConnection._add_proxy_headers(self) # Add a User-Agent header self.putheader("User-Agent", self._user_agent) def idn_pune_to_unicode(hostname): """ Convert Internationalized domain name from Pune encoding to Unicode """ if hostname is None: return None else: return hostname.decode('idna') def idn_ascii_to_pune(hostname): """ Convert domain name to Pune encoding. Hostname can be instance of string or Unicode """ if hostname is None: return None else: if not isinstance(hostname, unicode): hostname = unicode(hostname, 'utf-8') return hostname.encode('idna')