Netrunner 2004 October/NETRUNNER0410.ISO/regular/iria107a.lzh/script/httplib.pyc

Python Compiled Bytecode | 2000-11-17 | 28.1 KB | 739 lines

# Source Generated with Decompyle++
# File: in.pyc (Python 2.0)

'''HTTP/1.1 client library

<intro stuff goes here>
<other stuff, too>

HTTPConnection go through a number of "states", which defines when a client
may legally make another request or fetch the response for a particular
request. This diagram details these state transitions:

    (null)
      |
      | HTTPConnection()
      v
    Idle
      |
      | putrequest()
      v
    Request-started
      |
      | ( putheader() )*  endheaders()
      v
    Request-sent
      |
      | response = getresponse()
      v
    Unread-response   [Response-headers-read]
      |\\____________________
      |                           | response.read()      | putrequest()
      v                      v
    Idle                   Req-started-unread-response
                     _______/|
                    /        |
   response.read() |         | ( putheader() )*  endheaders()
                   v         v
       Request-started     Req-sent-unread-response
                             |
                             | response.read()
                             v
                           Request-sent

This diagram presents the following rules:
  -- a second request may not be started until {response-headers-read}
  -- a response [object] cannot be retrieved until {request-sent}
  -- there is no differentiation between an unread response body and a
     partially read response body

Note: this enforcement is applied by the HTTPConnection class. The
      HTTPResponse class does not enforce this state machine, which
      implies sophisticated clients may accelerate the request/response
      pipeline. Caution should be taken, though: accelerating the states
      beyond the above pattern may imply knowledge of the server\'s
      connection-close behavior for certain requests. For example, it
      is impossible to tell whether the server will close the connection
      UNTIL the response headers have been read; this means that further
      requests cannot be placed into the pipeline until it is known that
      the server will NOT be closing the connection.

Logical State                  __state            __response
-------------                  -------            ----------
Idle                           _CS_IDLE           None
Request-started                _CS_REQ_STARTED    None
Request-sent                   _CS_REQ_SENT       None
Unread-response                _CS_IDLE           <response_class>
Req-started-unread-response    _CS_REQ_STARTED    <response_class>
Req-sent-unread-response       _CS_REQ_SENT       <response_class>
'''
import socket
import string
import mimetools

try:
    from cStringIO import StringIO
except ImportError:
    from StringIO import StringIO

HTTP_PORT = 80
HTTPS_PORT = 443
_UNKNOWN = 'UNKNOWN'
_CS_IDLE = 'Idle'
_CS_REQ_STARTED = 'Request-started'
_CS_REQ_SENT = 'Request-sent'

class HTTPResponse:

    def __init__(self, sock, debuglevel = 0):
        self.fp = sock.makefile('rb', 0)
        self.debuglevel = debuglevel
        self.msg = None
        self.version = _UNKNOWN
        self.status = _UNKNOWN
        self.reason = _UNKNOWN
        self.chunked = _UNKNOWN
        self.chunk_left = _UNKNOWN
        self.length = _UNKNOWN
        self.will_close = _UNKNOWN


    def begin(self):
        if self.msg is not None:
            return None

        line = self.fp.readline()
        if self.debuglevel > 0:
            print 'reply:', repr(line)


        try:
            (version, status, reason) = string.split(line, None, 2)
        except ValueError:

            try:
                (version, status) = string.split(line, None, 1)
                reason = ''
            except ValueError:
                version = 'HTTP/0.9'
                status = '200'
                reason = ''


        if version[:5] != 'HTTP/':
            self.close()
            raise BadStatusLine(line)

        self.status = status = int(status)
        self.reason = string.strip(reason)
        if version == 'HTTP/1.0':
            self.version = 10
        elif version.startswith('HTTP/1.'):
            self.version = 11
        elif version == 'HTTP/0.9':
            self.version = 9
        else:
            raise UnknownProtocol(version)
        if self.version == 9:
            self.msg = mimetools.Message(StringIO())
            return None

        self.msg = mimetools.Message(self.fp, 0)
        self.msg.fp = None
        tr_enc = self.msg.getheader('transfer-encoding')
        conn = self.msg.getheader('connection')
        if conn:
            conn = string.lower(conn)
            if string.find(conn, 'close') != -1 and self.version != 11:
                pass
            self.will_close = not self.msg.getheader('keep-alive')
        elif self.version != 11:
            pass
        self.will_close = not self.msg.getheader('keep-alive')
        length = self.msg.getheader('content-length')
        if length and not (self.chunked):

            try:
                self.length = int(length)
            except ValueError:
                self.length = None

        else:
            self.length = None
        if not status == 204 and status == 304:
            if status <= status:
                pass
            elif status < 200:
                self.length = 0

        if not (self.will_close) and not (self.chunked) and self.length is None:
            self.will_close = 1



    def close(self):
        if self.fp:
            self.fp.close()
            self.fp = None



    def isclosed(self):
        return self.fp is None


    def read(self, amt = None):
        if self.fp is None:
            return ''

        if self.chunked:
            chunk_left = self.chunk_left
            value = ''
            while 1:
                if chunk_left is None:
                    line = self.fp.readline()
                    i = string.find(line, ';')
                    if i >= 0:
                        line = line[:i]

                    chunk_left = string.atoi(line, 16)
                    if chunk_left == 0:
                        break


                if amt is None:
                    value = value + self._safe_read(chunk_left)
                elif amt < chunk_left:
                    value = value + self._safe_read(amt)
                    self.chunk_left = chunk_left - amt
                    return value
                elif amt == chunk_left:
                    value = value + self._safe_read(amt)
                    self._safe_read(2)
                    self.chunk_left = None
                    return value
                else:
                    value = value + self._safe_read(chunk_left)
                    amt = amt - chunk_left
                self._safe_read(2)
                chunk_left = None
            while 1:
                line = self.fp.readline()
                if line == '\r\n':
                    break

            self.close()
            return value
        elif amt is None:
            if self.will_close:
                s = self.fp.read()
            else:
                s = self._safe_read(self.length)
            self.close()
            return s

        if self.length is not None:
            if amt > self.length:
                amt = self.length

            self.length = self.length - amt

        s = self.fp.read(amt)
        return s


    def _safe_read(self, amt):
        '''Read the number of bytes requested, compensating for partial reads.

        Normally, we have a blocking socket, but a read() can be interrupted
        by a signal (resulting in a partial read).

        Note that we cannot distinguish between EOF and an interrupt when zero
        bytes have been read. IncompleteRead() will be raised in this
        situation.

        This function should be used when <amt> bytes "should" be present for
        reading. If the bytes are truly not available (due to EOF), then the
        IncompleteRead exception can be used to detect the problem.
        '''
        s = ''
        while amt > 0:
            chunk = self.fp.read(amt)
            if not chunk:
                raise IncompleteRead(s)

            s = s + chunk
            amt = amt - len(chunk)
        return s


    def getheader(self, name, default = None):
        if self.msg is None:
            raise ResponseNotReady()

        return self.msg.getheader(name, default)



class HTTPConnection:
    _http_vsn = 11
    _http_vsn_str = 'HTTP/1.1'
    response_class = HTTPResponse
    default_port = HTTP_PORT
    auto_open = 1
    debuglevel = 0

    def __init__(self, host, port = None):
        self.sock = None
        self._HTTPConnection__response = None
        self._HTTPConnection__state = _CS_IDLE
        self._set_hostport(host, port)


    def _set_hostport(self, host, port):
        if port is None:
            i = string.find(host, ':')
            if i >= 0:
                port = int(host[i + 1:])
                host = host[:i]
            else:
                port = self.default_port

        self.host = host
        self.port = port


    def set_debuglevel(self, level):
        self.debuglevel = level


    def connect(self):
        '''Connect to the host and port specified in __init__.'''
        self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        if self.debuglevel > 0:
            print 'connect: (%s, %s)' % (self.host, self.port)

        self.sock.connect((self.host, self.port))


    def close(self):
        '''Close the connection to the HTTP server.'''
        if self.sock:
            self.sock.close()
            self.sock = None

        if self._HTTPConnection__response:
            self._HTTPConnection__response.close()
            self._HTTPConnection__response = None

        self._HTTPConnection__state = _CS_IDLE


    def send(self, str):
        """Send `str' to the server."""
        if self.sock is None:
            if self.auto_open:
                self.connect()
            else:
                raise NotConnected()

        if self.debuglevel > 0:
            print 'send:', repr(str)


        try:
            self.sock.send(str)
        except socket.error:
            v = None
            if v[0] == 32:
                self.close()

            raise



    def putrequest(self, method, url):
        """Send a request to the server.

        `method' specifies an HTTP request method, e.g. 'GET'.
        `url' specifies the object being requested, e.g. '/index.html'.
        """
        if self._HTTPConnection__response and self._HTTPConnection__response.isclosed():
            self._HTTPConnection__response = None

        if self._HTTPConnection__state == _CS_IDLE:
            self._HTTPConnection__state = _CS_REQ_STARTED
        else:
            raise CannotSendRequest()
        if not url:
            url = '/'

        str = '%s %s %s\r\n' % (method, url, self._http_vsn_str)

        try:
            self.send(str)
        except socket.error:
            v = None
            if v[0] != 32 or not (self.auto_open):
                raise

            self.send(str)

        if self._http_vsn == 11:
            self.putheader('Host', self.host)
            self.putheader('Accept-Encoding', 'identity')



    def putheader(self, header, value):
        """Send a request header line to the server.

        For example: h.putheader('Accept', 'text/html')
        """
        if self._HTTPConnection__state != _CS_REQ_STARTED:
            raise CannotSendHeader()

        str = '%s: %s\r\n' % (header, value)
        self.send(str)


    def endheaders(self):
        '''Indicate that the last header line has been sent to the server.'''
        if self._HTTPConnection__state == _CS_REQ_STARTED:
            self._HTTPConnection__state = _CS_REQ_SENT
        else:
            raise CannotSendHeader()
        self.send('\r\n')


    def request(self, method, url, body = None, headers = { }):
        '''Send a complete request to the server.'''

        try:
            self._send_request(method, url, body, headers)
        except socket.error:
            v = None
            if v[0] != 32 or not (self.auto_open):
                raise

            self._send_request(method, url, body, headers)



    def _send_request(self, method, url, body, headers):
        self.putrequest(method, url)
        if body:
            self.putheader('Content-Length', str(len(body)))

        for hdr, value in headers.items():
            self.putheader(hdr, value)

        self.endheaders()


    def getresponse(self):
        '''Get the response from the server.'''
        if self._HTTPConnection__response and self._HTTPConnection__response.isclosed():
            self._HTTPConnection__response = None

        if self._HTTPConnection__state != _CS_REQ_SENT or self._HTTPConnection__response:
            raise ResponseNotReady()

        if self.debuglevel > 0:
            response = self.response_class(self.sock, self.debuglevel)
        else:
            response = self.response_class(self.sock)
        response.begin()
        self._HTTPConnection__state = _CS_IDLE
        if response.will_close:
            self.close()
        else:
            self._HTTPConnection__response = response
        return response



class FakeSocket:

    def __init__(self, sock, ssl):
        self._FakeSocket__sock = sock
        self._FakeSocket__ssl = ssl


    def makefile(self, mode, bufsize = None):
        """Return a readable file-like object with data from socket.

        This method offers only partial support for the makefile
        interface of a real socket.  It only supports modes 'r' and
        'rb' and the bufsize argument is ignored.

        The returned object contains *all* of the file data
        """
        if mode != 'r' and mode != 'rb':
            raise UnimplementedFileMode()

        msgbuf = ''
        while 1:

            try:
                msgbuf = msgbuf + self._FakeSocket__ssl.read()
            except socket.sslerror:
                msg = None
                break

        return StringIO(msgbuf)


    def send(self, stuff, flags = 0):
        return self._FakeSocket__ssl.write(stuff)


    def recv(self, len = 1024, flags = 0):
        return self._FakeSocket__ssl.read(len)


    def __getattr__(self, attr):
        return getattr(self._FakeSocket__sock, attr)



class HTTPSConnection(HTTPConnection):
    '''This class allows communication via SSL.'''
    default_port = HTTPS_PORT

    def __init__(self, host, port = None, **x509):
        keys = x509.keys()

        try:
            keys.remove('key_file')
        except ValueError:
            pass


        try:
            keys.remove('cert_file')
        except ValueError:
            pass

        if keys:
            raise IllegalKeywordArgument()

        HTTPConnection.__init__(self, host, port)
        self.key_file = x509.get('key_file')
        self.cert_file = x509.get('cert_file')


    def connect(self):
        '''Connect to a host on a given (SSL) port.'''
        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        sock.connect((self.host, self.port))
        ssl = socket.ssl(sock, self.key_file, self.cert_file)
        self.sock = FakeSocket(sock, ssl)



class HTTP:
    '''Compatibility class with httplib.py from 1.5.'''
    _http_vsn = 10
    _http_vsn_str = 'HTTP/1.0'
    debuglevel = 0
    _connection_class = HTTPConnection

    def __init__(self, host = '', port = None, **x509):
        '''Provide a default host, since the superclass requires one.'''
        if port == 0:
            port = None

        self._conn = self._connection_class(host, port)
        self.send = self._conn.send
        self.putrequest = self._conn.putrequest
        self.endheaders = self._conn.endheaders
        self._conn._http_vsn = self._http_vsn
        self._conn._http_vsn_str = self._http_vsn_str
        self.key_file = x509.get('key_file')
        self.cert_file = x509.get('cert_file')
        self.file = None


    def connect(self, host = None, port = None):
        """Accept arguments to set the host/port, since the superclass doesn't."""
        if host is not None:
            self._conn._set_hostport(host, port)

        self._conn.connect()


    def set_debuglevel(self, debuglevel):
        self._conn.set_debuglevel(debuglevel)


    def getfile(self):
        """Provide a getfile, since the superclass' does not use this concept."""
        return self.file


    def putheader(self, header, *values):
        '''The superclass allows only one value argument.'''
        self._conn.putheader(header, string.joinfields(values, '\r\n\t'))


    def getreply(self):
        '''Compat definition since superclass does not define it.

        Returns a tuple consisting of:
        - server status code (e.g. \'200\' if all goes well)
        - server "reason" corresponding to status code
        - any RFC822 headers in the response from the server
        '''

        try:
            response = self._conn.getresponse()
        except BadStatusLine:
            e = None
            self.file = self._conn.sock.makefile('rb', 0)
            self.close()
            self.headers = None
            return (-1, e.line, None)

        self.headers = response.msg
        self.file = response.fp
        return (response.status, response.reason, response.msg)


    def close(self):
        self._conn.close()
        self.file = None


if hasattr(socket, 'ssl'):

    class HTTPS(HTTP):
        '''Compatibility with 1.5 httplib interface

        Python 1.5.2 did not have an HTTPS class, but it defined an
        interface for sending http requests that is also useful for
        https.
        '''
        _connection_class = HTTPSConnection



class HTTPException(Exception):
    pass


class NotConnected(HTTPException):
    pass


class UnknownProtocol(HTTPException):

    def __init__(self, version):
        self.version = version



class UnknownTransferEncoding(HTTPException):
    pass


class IllegalKeywordArgument(HTTPException):
    pass


class UnimplementedFileMode(HTTPException):
    pass


class IncompleteRead(HTTPException):

    def __init__(self, partial):
        self.partial = partial



class ImproperConnectionState(HTTPException):
    pass


class CannotSendRequest(ImproperConnectionState):
    pass


class CannotSendHeader(ImproperConnectionState):
    pass


class ResponseNotReady(ImproperConnectionState):
    pass


class BadStatusLine(HTTPException):

    def __init__(self, line):
        self.line = line


error = HTTPException

def test():
    '''Test this module.

    The test consists of retrieving and displaying the Python
    home page, along with the error code and error string returned
    by the www.python.org server.
    '''
    import sys
    import getopt
    (opts, args) = getopt.getopt(sys.argv[1:], 'd')
    dl = 0
    for o, a in opts:
        pass

    host = 'www.python.org'
    selector = '/'
    if args[0:]:
        host = args[0]

    if args[1:]:
        selector = args[1]

    h = HTTP()
    h.set_debuglevel(dl)
    h.connect(host)
    h.putrequest('GET', selector)
    h.endheaders()
    (status, reason, headers) = h.getreply()
    print 'status =', status
    print 'reason =', reason
    print
    if headers:
        for header in headers.headers:
            print string.strip(header)


    print
    print h.getfile().read()
    if hasattr(socket, 'ssl'):
        host = 'sourceforge.net'
        hs = HTTPS()
        hs.connect(host)
        hs.putrequest('GET', selector)
        hs.endheaders()
        (status, reason, headers) = hs.getreply()
        print 'status =', status
        print 'reason =', reason
        print
        if headers:
            for header in headers.headers:
                print string.strip(header)


        print
        print hs.getfile().read()


if __name__ == '__main__':
    test()