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Wrap

Python Source | 2005-09-12 | 45.7 KB | 1,368 lines

"""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 errno import mimetools import socket from urlparse import urlsplit try: from cStringIO import StringIO except ImportError: from StringIO import StringIO __all__ = ["HTTP", "HTTPResponse", "HTTPConnection", "HTTPSConnection", "HTTPException", "NotConnected", "UnknownProtocol", "UnknownTransferEncoding", "UnimplementedFileMode", "IncompleteRead", "InvalidURL", "ImproperConnectionState", "CannotSendRequest", "CannotSendHeader", "ResponseNotReady", "BadStatusLine", "error"] HTTP_PORT = 80 HTTPS_PORT = 443 _UNKNOWN = 'UNKNOWN' # connection states _CS_IDLE = 'Idle' _CS_REQ_STARTED = 'Request-started' _CS_REQ_SENT = 'Request-sent' # status codes # informational CONTINUE = 100 SWITCHING_PROTOCOLS = 101 PROCESSING = 102 # successful OK = 200 CREATED = 201 ACCEPTED = 202 NON_AUTHORITATIVE_INFORMATION = 203 NO_CONTENT = 204 RESET_CONTENT = 205 PARTIAL_CONTENT = 206 MULTI_STATUS = 207 IM_USED = 226 # redirection MULTIPLE_CHOICES = 300 MOVED_PERMANENTLY = 301 FOUND = 302 SEE_OTHER = 303 NOT_MODIFIED = 304 USE_PROXY = 305 TEMPORARY_REDIRECT = 307 # client error BAD_REQUEST = 400 UNAUTHORIZED = 401 PAYMENT_REQUIRED = 402 FORBIDDEN = 403 NOT_FOUND = 404 METHOD_NOT_ALLOWED = 405 NOT_ACCEPTABLE = 406 PROXY_AUTHENTICATION_REQUIRED = 407 REQUEST_TIMEOUT = 408 CONFLICT = 409 GONE = 410 LENGTH_REQUIRED = 411 PRECONDITION_FAILED = 412 REQUEST_ENTITY_TOO_LARGE = 413 REQUEST_URI_TOO_LONG = 414 UNSUPPORTED_MEDIA_TYPE = 415 REQUESTED_RANGE_NOT_SATISFIABLE = 416 EXPECTATION_FAILED = 417 UNPROCESSABLE_ENTITY = 422 LOCKED = 423 FAILED_DEPENDENCY = 424 UPGRADE_REQUIRED = 426 # server error INTERNAL_SERVER_ERROR = 500 NOT_IMPLEMENTED = 501 BAD_GATEWAY = 502 SERVICE_UNAVAILABLE = 503 GATEWAY_TIMEOUT = 504 HTTP_VERSION_NOT_SUPPORTED = 505 INSUFFICIENT_STORAGE = 507 NOT_EXTENDED = 510 class HTTPMessage(mimetools.Message): def addheader(self, key, value): """Add header for field key handling repeats.""" prev = self.dict.get(key) if prev is None: self.dict[key] = value else: combined = ", ".join((prev, value)) self.dict[key] = combined def addcontinue(self, key, more): """Add more field data from a continuation line.""" prev = self.dict[key] self.dict[key] = prev + "\n " + more def readheaders(self): """Read header lines. Read header lines up to the entirely blank line that terminates them. The (normally blank) line that ends the headers is skipped, but not included in the returned list. If a non-header line ends the headers, (which is an error), an attempt is made to backspace over it; it is never included in the returned list. The variable self.status is set to the empty string if all went well, otherwise it is an error message. The variable self.headers is a completely uninterpreted list of lines contained in the header (so printing them will reproduce the header exactly as it appears in the file). If multiple header fields with the same name occur, they are combined according to the rules in RFC 2616 sec 4.2: Appending each subsequent field-value to the first, each separated by a comma. The order in which header fields with the same field-name are received is significant to the interpretation of the combined field value. """ # XXX The implementation overrides the readheaders() method of # rfc822.Message. The base class design isn't amenable to # customized behavior here so the method here is a copy of the # base class code with a few small changes. self.dict = {} self.unixfrom = '' self.headers = hlist = [] self.status = '' headerseen = "" firstline = 1 startofline = unread = tell = None if hasattr(self.fp, 'unread'): unread = self.fp.unread elif self.seekable: tell = self.fp.tell while True: if tell: try: startofline = tell() except IOError: startofline = tell = None self.seekable = 0 line = self.fp.readline() if not line: self.status = 'EOF in headers' break # Skip unix From name time lines if firstline and line.startswith('From '): self.unixfrom = self.unixfrom + line continue firstline = 0 if headerseen and line[0] in ' \t': # XXX Not sure if continuation lines are handled properly # for http and/or for repeating headers # It's a continuation line. hlist.append(line) self.addcontinue(headerseen, line.strip()) continue elif self.iscomment(line): # It's a comment. Ignore it. continue elif self.islast(line): # Note! No pushback here! The delimiter line gets eaten. break headerseen = self.isheader(line) if headerseen: # It's a legal header line, save it. hlist.append(line) self.addheader(headerseen, line[len(headerseen)+1:].strip()) continue else: # It's not a header line; throw it back and stop here. if not self.dict: self.status = 'No headers' else: self.status = 'Non-header line where header expected' # Try to undo the read. if unread: unread(line) elif tell: self.fp.seek(startofline) else: self.status = self.status + '; bad seek' break class HTTPResponse: # strict: If true, raise BadStatusLine if the status line can't be # parsed as a valid HTTP/1.0 or 1.1 status line. By default it is # false because it prevents clients from talking to HTTP/0.9 # servers. Note that a response with a sufficiently corrupted # status line will look like an HTTP/0.9 response. # See RFC 2616 sec 19.6 and RFC 1945 sec 6 for details. def __init__(self, sock, debuglevel=0, strict=0, method=None): self.fp = sock.makefile('rb', 0) self.debuglevel = debuglevel self.strict = strict self._method = method self.msg = None # from the Status-Line of the response self.version = _UNKNOWN # HTTP-Version self.status = _UNKNOWN # Status-Code self.reason = _UNKNOWN # Reason-Phrase self.chunked = _UNKNOWN # is "chunked" being used? self.chunk_left = _UNKNOWN # bytes left to read in current chunk self.length = _UNKNOWN # number of bytes left in response self.will_close = _UNKNOWN # conn will close at end of response def _read_status(self): # Initialize with Simple-Response defaults line = self.fp.readline() if self.debuglevel > 0: print "reply:", repr(line) if not line: # Presumably, the server closed the connection before # sending a valid response. raise BadStatusLine(line) try: [version, status, reason] = line.split(None, 2) except ValueError: try: [version, status] = line.split(None, 1) reason = "" except ValueError: # empty version will cause next test to fail and status # will be treated as 0.9 response. version = "" if not version.startswith('HTTP/'): if self.strict: self.close() raise BadStatusLine(line) else: # assume it's a Simple-Response from an 0.9 server self.fp = LineAndFileWrapper(line, self.fp) return "HTTP/0.9", 200, "" # The status code is a three-digit number try: status = int(status) if status < 100 or status > 999: raise BadStatusLine(line) except ValueError: raise BadStatusLine(line) return version, status, reason def begin(self): if self.msg is not None: # we've already started reading the response return # read until we get a non-100 response while True: version, status, reason = self._read_status() if status != CONTINUE: break # skip the header from the 100 response while True: skip = self.fp.readline().strip() if not skip: break if self.debuglevel > 0: print "header:", skip self.status = status self.reason = reason.strip() if version == 'HTTP/1.0': self.version = 10 elif version.startswith('HTTP/1.'): self.version = 11 # use HTTP/1.1 code for HTTP/1.x where x>=1 elif version == 'HTTP/0.9': self.version = 9 else: raise UnknownProtocol(version) if self.version == 9: self.length = None self.chunked = 0 self.will_close = 1 self.msg = HTTPMessage(StringIO()) return self.msg = HTTPMessage(self.fp, 0) if self.debuglevel > 0: for hdr in self.msg.headers: print "header:", hdr, # don't let the msg keep an fp self.msg.fp = None # are we using the chunked-style of transfer encoding? tr_enc = self.msg.getheader('transfer-encoding') if tr_enc and tr_enc.lower() == "chunked": self.chunked = 1 self.chunk_left = None else: self.chunked = 0 # will the connection close at the end of the response? self.will_close = self._check_close() # do we have a Content-Length? # NOTE: RFC 2616, S4.4, #3 says we ignore this if tr_enc is "chunked" 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 # does the body have a fixed length? (of zero) if (status == NO_CONTENT or status == NOT_MODIFIED or 100 <= status < 200 or # 1xx codes self._method == 'HEAD'): self.length = 0 # if the connection remains open, and we aren't using chunked, and # a content-length was not provided, then assume that the connection # WILL close. if not self.will_close and \ not self.chunked and \ self.length is None: self.will_close = 1 def _check_close(self): conn = self.msg.getheader('connection') if self.version == 11: # An HTTP/1.1 proxy is assumed to stay open unless # explicitly closed. conn = self.msg.getheader('connection') if conn and "close" in conn.lower(): return True return False # Some HTTP/1.0 implementations have support for persistent # connections, using rules different than HTTP/1.1. # For older HTTP, Keep-Alive indiciates persistent connection. if self.msg.getheader('keep-alive'): return False # At least Akamai returns a "Connection: Keep-Alive" header, # which was supposed to be sent by the client. if conn and "keep-alive" in conn.lower(): return False # Proxy-Connection is a netscape hack. pconn = self.msg.getheader('proxy-connection') if pconn and "keep-alive" in pconn.lower(): return False # otherwise, assume it will close return True def close(self): if self.fp: self.fp.close() self.fp = None def isclosed(self): # NOTE: it is possible that we will not ever call self.close(). This # case occurs when will_close is TRUE, length is None, and we # read up to the last byte, but NOT past it. # # IMPLIES: if will_close is FALSE, then self.close() will ALWAYS be # called, meaning self.isclosed() is meaningful. return self.fp is None # XXX It would be nice to have readline and __iter__ for this, too. def read(self, amt=None): if self.fp is None: return '' if self.chunked: return self._read_chunked(amt) if amt is None: # unbounded read if self.length is None: s = self.fp.read() else: s = self._safe_read(self.length) self.length = 0 self.close() # we read everything return s if self.length is not None: if amt > self.length: # clip the read to the "end of response" amt = self.length # we do not use _safe_read() here because this may be a .will_close # connection, and the user is reading more bytes than will be provided # (for example, reading in 1k chunks) s = self.fp.read(amt) if self.length is not None: self.length -= len(s) return s def _read_chunked(self, amt): assert self.chunked != _UNKNOWN chunk_left = self.chunk_left value = '' # XXX This accumulates chunks by repeated string concatenation, # which is not efficient as the number or size of chunks gets big. while True: if chunk_left is None: line = self.fp.readline() i = line.find(';') if i >= 0: line = line[:i] # strip chunk-extensions chunk_left = int(line, 16) if chunk_left == 0: break if amt is None: value += self._safe_read(chunk_left) elif amt < chunk_left: value += self._safe_read(amt) self.chunk_left = chunk_left - amt return value elif amt == chunk_left: value += self._safe_read(amt) self._safe_read(2) # toss the CRLF at the end of the chunk self.chunk_left = None return value else: value += self._safe_read(chunk_left) amt -= chunk_left # we read the whole chunk, get another self._safe_read(2) # toss the CRLF at the end of the chunk chunk_left = None # read and discard trailer up to the CRLF terminator ### note: we shouldn't have any trailers! while True: line = self.fp.readline() if line == '\r\n': break # we read everything; close the "file" self.close() return value 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 += chunk amt -= len(chunk) return s def getheader(self, name, default=None): if self.msg is None: raise ResponseNotReady() return self.msg.getheader(name, default) def getheaders(self): """Return list of (header, value) tuples.""" if self.msg is None: raise ResponseNotReady() return self.msg.items() class HTTPConnection: _http_vsn = 11 _http_vsn_str = 'HTTP/1.1' response_class = HTTPResponse default_port = HTTP_PORT auto_open = 1 debuglevel = 0 strict = 0 def __init__(self, host, port=None, strict=None): self.sock = None self._buffer = [] self.__response = None self.__state = _CS_IDLE self._method = None self._set_hostport(host, port) if strict is not None: self.strict = strict def _set_hostport(self, host, port): if port is None: i = host.rfind(':') j = host.rfind(']') # ipv6 addresses have [...] if i > j: try: port = int(host[i+1:]) except ValueError: raise InvalidURL("nonnumeric port: '%s'" % host[i+1:]) host = host[:i] else: port = self.default_port if host and host[0] == '[' and host[-1] == ']': host = host[1:-1] 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__.""" msg = "getaddrinfo returns an empty list" for res in socket.getaddrinfo(self.host, self.port, 0, socket.SOCK_STREAM): af, socktype, proto, canonname, sa = res try: self.sock = socket.socket(af, socktype, proto) if self.debuglevel > 0: print "connect: (%s, %s)" % (self.host, self.port) self.sock.connect(sa) except socket.error, msg: if self.debuglevel > 0: print 'connect fail:', (self.host, self.port) if self.sock: self.sock.close() self.sock = None continue break if not self.sock: raise socket.error, msg def close(self): """Close the connection to the HTTP server.""" if self.sock: self.sock.close() # close it manually... there may be other refs self.sock = None if self.__response: self.__response.close() self.__response = None self.__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() # send the data to the server. if we get a broken pipe, then close # the socket. we want to reconnect when somebody tries to send again. # # NOTE: we DO propagate the error, though, because we cannot simply # ignore the error... the caller will know if they can retry. if self.debuglevel > 0: print "send:", repr(str) try: self.sock.sendall(str) except socket.error, v: if v[0] == 32: # Broken pipe self.close() raise def _output(self, s): """Add a line of output to the current request buffer. Assumes that the line does *not* end with \\r\\n. """ self._buffer.append(s) def _send_output(self): """Send the currently buffered request and clear the buffer. Appends an extra \\r\\n to the buffer. """ self._buffer.extend(("", "")) msg = "\r\n".join(self._buffer) del self._buffer[:] self.send(msg) def putrequest(self, method, url, skip_host=0, skip_accept_encoding=0): """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'. `skip_host' if True does not add automatically a 'Host:' header `skip_accept_encoding' if True does not add automatically an 'Accept-Encoding:' header """ # if a prior response has been completed, then forget about it. if self.__response and self.__response.isclosed(): self.__response = None # in certain cases, we cannot issue another request on this connection. # this occurs when: # 1) we are in the process of sending a request. (_CS_REQ_STARTED) # 2) a response to a previous request has signalled that it is going # to close the connection upon completion. # 3) the headers for the previous response have not been read, thus # we cannot determine whether point (2) is true. (_CS_REQ_SENT) # # if there is no prior response, then we can request at will. # # if point (2) is true, then we will have passed the socket to the # response (effectively meaning, "there is no prior response"), and # will open a new one when a new request is made. # # Note: if a prior response exists, then we *can* start a new request. # We are not allowed to begin fetching the response to this new # request, however, until that prior response is complete. # if self.__state == _CS_IDLE: self.__state = _CS_REQ_STARTED else: raise CannotSendRequest() # Save the method we use, we need it later in the response phase self._method = method if not url: url = '/' str = '%s %s %s' % (method, url, self._http_vsn_str) self._output(str) if self._http_vsn == 11: # Issue some standard headers for better HTTP/1.1 compliance if not skip_host: # this header is issued *only* for HTTP/1.1 # connections. more specifically, this means it is # only issued when the client uses the new # HTTPConnection() class. backwards-compat clients # will be using HTTP/1.0 and those clients may be # issuing this header themselves. we should NOT issue # it twice; some web servers (such as Apache) barf # when they see two Host: headers # If we need a non-standard port,include it in the # header. If the request is going through a proxy, # but the host of the actual URL, not the host of the # proxy. netloc = '' if url.startswith('http'): nil, netloc, nil, nil, nil = urlsplit(url) if netloc: self.putheader('Host', netloc.encode("idna")) elif self.port == HTTP_PORT: self.putheader('Host', self.host.encode("idna")) else: self.putheader('Host', "%s:%s" % (self.host.encode("idna"), self.port)) # note: we are assuming that clients will not attempt to set these # headers since *this* library must deal with the # consequences. this also means that when the supporting # libraries are updated to recognize other forms, then this # code should be changed (removed or updated). # we only want a Content-Encoding of "identity" since we don't # support encodings such as x-gzip or x-deflate. if not skip_accept_encoding: self.putheader('Accept-Encoding', 'identity') # we can accept "chunked" Transfer-Encodings, but no others # NOTE: no TE header implies *only* "chunked" #self.putheader('TE', 'chunked') # if TE is supplied in the header, then it must appear in a # Connection header. #self.putheader('Connection', 'TE') else: # For HTTP/1.0, the server will assume "not chunked" pass def putheader(self, header, value): """Send a request header line to the server. For example: h.putheader('Accept', 'text/html') """ if self.__state != _CS_REQ_STARTED: raise CannotSendHeader() str = '%s: %s' % (header, value) self._output(str) def endheaders(self): """Indicate that the last header line has been sent to the server.""" if self.__state == _CS_REQ_STARTED: self.__state = _CS_REQ_SENT else: raise CannotSendHeader() self._send_output() 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: # trap 'Broken pipe' if we're allowed to automatically reconnect if v[0] != 32 or not self.auto_open: raise # try one more time self._send_request(method, url, body, headers) def _send_request(self, method, url, body, headers): # honour explicitly requested Host: and Accept-Encoding headers header_names = dict.fromkeys([k.lower() for k in headers]) skips = {} if 'host' in header_names: skips['skip_host'] = 1 if 'accept-encoding' in header_names: skips['skip_accept_encoding'] = 1 self.putrequest(method, url, **skips) if body and ('content-length' not in header_names): self.putheader('Content-Length', str(len(body))) for hdr, value in headers.iteritems(): self.putheader(hdr, value) self.endheaders() if body: self.send(body) def getresponse(self): "Get the response from the server." # if a prior response has been completed, then forget about it. 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, strict=self.strict, method=self._method) else: response = self.response_class(self.sock, strict=self.strict, method=self._method) response.begin() assert response.will_close != _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 # The next several classes are used to define FakeSocket,a socket-like # interface to an SSL connection. # The primary complexity comes from faking a makefile() method. The # standard socket makefile() implementation calls dup() on the socket # file descriptor. As a consequence, clients can call close() on the # parent socket and its makefile children in any order. The underlying # socket isn't closed until they are all closed. # The implementation uses reference counting to keep the socket open # until the last client calls close(). SharedSocket keeps track of # the reference counting and SharedSocketClient provides an constructor # and close() method that call incref() and decref() correctly. class SharedSocket: def __init__(self, sock): self.sock = sock self._refcnt = 0 def incref(self): self._refcnt += 1 def decref(self): self._refcnt -= 1 assert self._refcnt >= 0 if self._refcnt == 0: self.sock.close() def __del__(self): self.sock.close() class SharedSocketClient: def __init__(self, shared): self._closed = 0 self._shared = shared self._shared.incref() self._sock = shared.sock def close(self): if not self._closed: self._shared.decref() self._closed = 1 self._shared = None class SSLFile(SharedSocketClient): """File-like object wrapping an SSL socket.""" BUFSIZE = 8192 def __init__(self, sock, ssl, bufsize=None): SharedSocketClient.__init__(self, sock) self._ssl = ssl self._buf = '' self._bufsize = bufsize or self.__class__.BUFSIZE def _read(self): buf = '' # put in a loop so that we retry on transient errors while True: try: buf = self._ssl.read(self._bufsize) except socket.sslerror, err: if (err[0] == socket.SSL_ERROR_WANT_READ or err[0] == socket.SSL_ERROR_WANT_WRITE): continue if (err[0] == socket.SSL_ERROR_ZERO_RETURN or err[0] == socket.SSL_ERROR_EOF): break raise except socket.error, err: if err[0] == errno.EINTR: continue if err[0] == errno.EBADF: # XXX socket was closed? break raise else: break return buf def read(self, size=None): L = [self._buf] avail = len(self._buf) while size is None or avail < size: s = self._read() if s == '': break L.append(s) avail += len(s) all = "".join(L) if size is None: self._buf = '' return all else: self._buf = all[size:] return all[:size] def readline(self): L = [self._buf] self._buf = '' while 1: i = L[-1].find("\n") if i >= 0: break s = self._read() if s == '': break L.append(s) if i == -1: # loop exited because there is no more data return "".join(L) else: all = "".join(L) # XXX could do enough bookkeeping not to do a 2nd search i = all.find("\n") + 1 line = all[:i] self._buf = all[i:] return line def readlines(self, sizehint=0): total = 0 list = [] while True: line = self.readline() if not line: break list.append(line) total += len(line) if sizehint and total >= sizehint: break return list def fileno(self): return self._sock.fileno() def __iter__(self): return self def next(self): line = self.readline() if not line: raise StopIteration return line class FakeSocket(SharedSocketClient): class _closedsocket: def __getattr__(self, name): raise error(9, 'Bad file descriptor') def __init__(self, sock, ssl): sock = SharedSocket(sock) SharedSocketClient.__init__(self, sock) self._ssl = ssl def close(self): SharedSocketClient.close(self) self._sock = self.__class__._closedsocket() def makefile(self, mode, bufsize=None): if mode != 'r' and mode != 'rb': raise UnimplementedFileMode() return SSLFile(self._shared, self._ssl, bufsize) def send(self, stuff, flags = 0): return self._ssl.write(stuff) sendall = send def recv(self, len = 1024, flags = 0): return self._ssl.read(len) def __getattr__(self, attr): return getattr(self._sock, attr) class HTTPSConnection(HTTPConnection): "This class allows communication via SSL." default_port = HTTPS_PORT def __init__(self, host, port=None, key_file=None, cert_file=None, strict=None): HTTPConnection.__init__(self, host, port, strict) self.key_file = key_file self.cert_file = 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, strict=None): "Provide a default host, since the superclass requires one." # some joker passed 0 explicitly, meaning default port if port == 0: port = None # Note that we may pass an empty string as the host; this will throw # an error when we attempt to connect. Presumably, the client code # will call connect before then, with a proper host. self._setup(self._connection_class(host, port, strict)) def _setup(self, conn): self._conn = conn # set up delegation to flesh out interface self.send = conn.send self.putrequest = conn.putrequest self.endheaders = conn.endheaders self.set_debuglevel = conn.set_debuglevel conn._http_vsn = self._http_vsn conn._http_vsn_str = self._http_vsn_str 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 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, '\r\n\t'.join(values)) 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: ### hmm. if getresponse() ever closes the socket on a bad request, ### then we are going to have problems with self.sock ### should we keep this behavior? do people use it? # keep the socket open (as a file), and return it self.file = self._conn.sock.makefile('rb', 0) # close our socket -- we want to restart after any protocol error 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() # note that self.file == response.fp, which gets closed by the # superclass. just clear the object ref here. ### hmm. messy. if status==-1, then self.file is owned by us. ### well... we aren't explicitly closing, but losing this ref will ### do it 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 def __init__(self, host='', port=None, key_file=None, cert_file=None, strict=None): # provide a default host, pass the X509 cert info # urf. compensate for bad input. if port == 0: port = None self._setup(self._connection_class(host, port, key_file, cert_file, strict)) # we never actually use these for anything, but we keep them # here for compatibility with post-1.5.2 CVS. self.key_file = key_file self.cert_file = cert_file class HTTPException(Exception): # Subclasses that define an __init__ must call Exception.__init__ # or define self.args. Otherwise, str() will fail. pass class NotConnected(HTTPException): pass class InvalidURL(HTTPException): pass class UnknownProtocol(HTTPException): def __init__(self, version): self.args = version, self.version = version class UnknownTransferEncoding(HTTPException): pass class UnimplementedFileMode(HTTPException): pass class IncompleteRead(HTTPException): def __init__(self, partial): self.args = 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.args = line, self.line = line # for backwards compatibility error = HTTPException class LineAndFileWrapper: """A limited file-like object for HTTP/0.9 responses.""" # The status-line parsing code calls readline(), which normally # get the HTTP status line. For a 0.9 response, however, this is # actually the first line of the body! Clients need to get a # readable file object that contains that line. def __init__(self, line, file): self._line = line self._file = file self._line_consumed = 0 self._line_offset = 0 self._line_left = len(line) def __getattr__(self, attr): return getattr(self._file, attr) def _done(self): # called when the last byte is read from the line. After the # call, all read methods are delegated to the underlying file # object. self._line_consumed = 1 self.read = self._file.read self.readline = self._file.readline self.readlines = self._file.readlines def read(self, amt=None): if self._line_consumed: return self._file.read(amt) assert self._line_left if amt is None or amt > self._line_left: s = self._line[self._line_offset:] self._done() if amt is None: return s + self._file.read() else: return s + self._file.read(amt - len(s)) else: assert amt <= self._line_left i = self._line_offset j = i + amt s = self._line[i:j] self._line_offset = j self._line_left -= amt if self._line_left == 0: self._done() return s def readline(self): if self._line_consumed: return self._file.readline() assert self._line_left s = self._line[self._line_offset:] self._done() return s def readlines(self, size=None): if self._line_consumed: return self._file.readlines(size) assert self._line_left L = [self._line[self._line_offset:]] self._done() if size is None: return L + self._file.readlines() else: return L + self._file.readlines(size) def test(): """Test this module. A hodge podge of tests collected here, because they have too many external dependencies for the regular test suite. """ import sys import getopt opts, args = getopt.getopt(sys.argv[1:], 'd') dl = 0 for o, a in opts: if o == '-d': dl = dl + 1 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 "read", len(h.getfile().read()) print if headers: for header in headers.headers: print header.strip() print # minimal test that code to extract host from url works class HTTP11(HTTP): _http_vsn = 11 _http_vsn_str = 'HTTP/1.1' h = HTTP11('www.python.org') h.putrequest('GET', 'http://www.python.org/~jeremy/') h.endheaders() h.getreply() h.close() if hasattr(socket, 'ssl'): for host, selector in (('sourceforge.net', '/projects/python'), ): print "https://%s%s" % (host, selector) hs = HTTPS() hs.set_debuglevel(dl) hs.connect(host) hs.putrequest('GET', selector) hs.endheaders() status, reason, headers = hs.getreply() print 'status =', status print 'reason =', reason print "read", len(hs.getfile().read()) print if headers: for header in headers.headers: print header.strip() print if __name__ == '__main__': test()