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09c8b6c3e4
Brian E Gallew, which were improved and adapted to OpenSSL 0.9.4 by Laszlo Kovacs of HP. Both have kindly given permission to include the patches in the Python distribution. Final formatting by GvR.
273 lines
7.8 KiB
Python
273 lines
7.8 KiB
Python
"""HTTP client class
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See the following URL for a description of the HTTP/1.0 protocol:
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http://www.w3.org/hypertext/WWW/Protocols/
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(I actually implemented it from a much earlier draft.)
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Example:
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>>> from httplib import HTTP
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>>> h = HTTP('www.python.org')
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>>> h.putrequest('GET', '/index.html')
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>>> h.putheader('Accept', 'text/html')
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>>> h.putheader('Accept', 'text/plain')
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>>> h.endheaders()
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>>> errcode, errmsg, headers = h.getreply()
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>>> if errcode == 200:
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... f = h.getfile()
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... print f.read() # Print the raw HTML
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...
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<HEAD>
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<TITLE>Python Language Home Page</TITLE>
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[...many more lines...]
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>>>
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Note that an HTTP object is used for a single request -- to issue a
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second request to the same server, you create a new HTTP object.
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(This is in accordance with the protocol, which uses a new TCP
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connection for each request.)
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"""
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import os
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import socket
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import string
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import mimetools
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try:
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from cStringIO import StringIO
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except:
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from StringIO import StringIO
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HTTP_VERSION = 'HTTP/1.0'
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HTTP_PORT = 80
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HTTPS_PORT = 443
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class FakeSocket:
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def __init__(self, sock, ssl):
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self.__sock = sock
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self.__ssl = ssl
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return
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def makefile(self, mode): # hopefully, never have to write
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msgbuf = ""
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while 1:
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try:
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msgbuf = msgbuf + self.__ssl.read()
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except socket.sslerror, msg:
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break
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return StringIO(msgbuf)
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def send(self, stuff, flags = 0):
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return self.__ssl.write(stuff)
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def recv(self, len = 1024, flags = 0):
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return self.__ssl.read(len)
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def __getattr__(self, attr):
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return getattr(self.__sock, attr)
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class HTTP:
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"""This class manages a connection to an HTTP server."""
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def __init__(self, host = '', port = 0, **x509):
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"""Initialize a new instance.
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If specified, `host' is the name of the remote host to which
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to connect. If specified, `port' specifies the port to which
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to connect. By default, httplib.HTTP_PORT is used.
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"""
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self.key_file = x509.get('key_file')
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self.cert_file = x509.get('cert_file')
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self.debuglevel = 0
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self.file = None
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if host: self.connect(host, port)
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def set_debuglevel(self, debuglevel):
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"""Set the debug output level.
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A non-false value results in debug messages for connection and
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for all messages sent to and received from the server.
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"""
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self.debuglevel = debuglevel
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def connect(self, host, port = 0):
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"""Connect to a host on a given port.
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Note: This method is automatically invoked by __init__,
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if a host is specified during instantiation.
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"""
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if not port:
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i = string.find(host, ':')
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if i >= 0:
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host, port = host[:i], host[i+1:]
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try: port = string.atoi(port)
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except string.atoi_error:
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raise socket.error, "nonnumeric port"
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if not port: port = HTTP_PORT
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self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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if self.debuglevel > 0: print 'connect:', (host, port)
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self.sock.connect(host, port)
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def send(self, str):
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"""Send `str' to the server."""
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if self.debuglevel > 0: print 'send:', `str`
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self.sock.send(str)
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def putrequest(self, request, selector):
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"""Send a request to the server.
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`request' specifies an HTTP request method, e.g. 'GET'.
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`selector' specifies the object being requested, e.g.
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'/index.html'.
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"""
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if not selector: selector = '/'
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str = '%s %s %s\r\n' % (request, selector, HTTP_VERSION)
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self.send(str)
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def putheader(self, header, *args):
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"""Send a request header line to the server.
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For example: h.putheader('Accept', 'text/html')
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"""
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str = '%s: %s\r\n' % (header, string.joinfields(args,'\r\n\t'))
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self.send(str)
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def endheaders(self):
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"""Indicate that the last header line has been sent to the server."""
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self.send('\r\n')
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def getreply(self):
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"""Get a reply from the server.
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Returns a tuple consisting of:
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- server response code (e.g. '200' if all goes well)
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- server response string corresponding to response code
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- any RFC822 headers in the response from the server
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"""
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self.file = self.sock.makefile('rb')
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line = self.file.readline()
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if self.debuglevel > 0: print 'reply:', `line`
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try:
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[ver, code, msg] = string.split(line, None, 2)
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except ValueError:
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try:
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[ver, code] = string.split(line, None, 1)
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msg = ""
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except ValueError:
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self.headers = None
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return -1, line, self.headers
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if ver[:5] != 'HTTP/':
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self.headers = None
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return -1, line, self.headers
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errcode = string.atoi(code)
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errmsg = string.strip(msg)
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self.headers = mimetools.Message(self.file, 0)
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return errcode, errmsg, self.headers
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def getfile(self):
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"""Get a file object from which to receive data from the HTTP server.
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NOTE: This method must not be invoked until getreplies
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has been invoked.
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"""
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return self.file
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def close(self):
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"""Close the connection to the HTTP server."""
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if self.file:
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self.file.close()
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self.file = None
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if self.sock:
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self.sock.close()
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self.sock = None
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if hasattr(socket, "ssl"):
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class HTTPS(HTTP):
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"""This class allows communication via SSL."""
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def connect(self, host, port = 0):
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"""Connect to a host on a given port.
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Note: This method is automatically invoked by __init__,
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if a host is specified during instantiation.
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"""
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if not port:
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i = string.find(host, ':')
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if i >= 0:
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host, port = host[:i], host[i+1:]
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try: port = string.atoi(port)
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except string.atoi_error:
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raise socket.error, "nonnumeric port"
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if not port: port = HTTPS_PORT
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sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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if self.debuglevel > 0: print 'connect:', (host, port)
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sock.connect(host, port)
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ssl = socket.ssl(sock, self.key_file, self.cert_file)
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self.sock = FakeSocket(sock, ssl)
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def test():
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"""Test this module.
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The test consists of retrieving and displaying the Python
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home page, along with the error code and error string returned
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by the www.python.org server.
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"""
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import sys
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import getopt
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opts, args = getopt.getopt(sys.argv[1:], 'd')
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dl = 0
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for o, a in opts:
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if o == '-d': dl = dl + 1
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print "testing HTTP..."
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host = 'www.python.org'
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selector = '/'
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if args[0:]: host = args[0]
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if args[1:]: selector = args[1]
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h = HTTP()
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h.set_debuglevel(dl)
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h.connect(host)
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h.putrequest('GET', selector)
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h.endheaders()
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errcode, errmsg, headers = h.getreply()
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print 'errcode =', errcode
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print 'errmsg =', errmsg
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print
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if headers:
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for header in headers.headers: print string.strip(header)
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print
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print h.getfile().read()
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if hasattr(socket, "ssl"):
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print "-"*40
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print "testing HTTPS..."
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host = 'synergy.as.cmu.edu'
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selector = '/~geek/'
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if args[0:]: host = args[0]
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if args[1:]: selector = args[1]
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h = HTTPS()
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h.set_debuglevel(dl)
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h.connect(host)
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h.putrequest('GET', selector)
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h.endheaders()
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errcode, errmsg, headers = h.getreply()
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print 'errcode =', errcode
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print 'errmsg =', errmsg
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print
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if headers:
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for header in headers.headers: print string.strip(header)
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print
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print h.getfile().read()
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if __name__ == '__main__':
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test()
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