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Diffstat (limited to 'Lib/http/client.py')
| -rw-r--r-- | Lib/http/client.py | 1132 |
1 files changed, 1132 insertions, 0 deletions
diff --git a/Lib/http/client.py b/Lib/http/client.py new file mode 100644 index 0000000..de27c17 --- /dev/null +++ b/Lib/http/client.py @@ -0,0 +1,1132 @@ +"""HTTP/1.1 client library + +<intro stuff goes here> +<other stuff, too> + +HTTPConnection goes through a number of "states", which define 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 io +import mimetools +import socket +from urlparse import urlsplit +import warnings + +__all__ = ["HTTPResponse", "HTTPConnection", + "HTTPException", "NotConnected", "UnknownProtocol", + "UnknownTransferEncoding", "UnimplementedFileMode", + "IncompleteRead", "InvalidURL", "ImproperConnectionState", + "CannotSendRequest", "CannotSendHeader", "ResponseNotReady", + "BadStatusLine", "error", "responses"] + +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 + +# Mapping status codes to official W3C names +responses = { + 100: 'Continue', + 101: 'Switching Protocols', + + 200: 'OK', + 201: 'Created', + 202: 'Accepted', + 203: 'Non-Authoritative Information', + 204: 'No Content', + 205: 'Reset Content', + 206: 'Partial Content', + + 300: 'Multiple Choices', + 301: 'Moved Permanently', + 302: 'Found', + 303: 'See Other', + 304: 'Not Modified', + 305: 'Use Proxy', + 306: '(Unused)', + 307: 'Temporary Redirect', + + 400: 'Bad Request', + 401: 'Unauthorized', + 402: 'Payment Required', + 403: 'Forbidden', + 404: 'Not Found', + 405: 'Method Not Allowed', + 406: 'Not Acceptable', + 407: 'Proxy Authentication Required', + 408: 'Request Timeout', + 409: 'Conflict', + 410: 'Gone', + 411: 'Length Required', + 412: 'Precondition Failed', + 413: 'Request Entity Too Large', + 414: 'Request-URI Too Long', + 415: 'Unsupported Media Type', + 416: 'Requested Range Not Satisfiable', + 417: 'Expectation Failed', + + 500: 'Internal Server Error', + 501: 'Not Implemented', + 502: 'Bad Gateway', + 503: 'Service Unavailable', + 504: 'Gateway Timeout', + 505: 'HTTP Version Not Supported', +} + +# maximal amount of data to read at one time in _safe_read +MAXAMOUNT = 1048576 + +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 = str(self.fp.readline(), "iso-8859-1") + 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. + + # The bytes from the socket object are iso-8859-1 strings. + # See RFC 2616 sec 2.2 which notes an exception for MIME-encoded + # text following RFC 2047. The basic status line parsing only + # accepts iso-8859-1. + + def __init__(self, sock, debuglevel=0, strict=0, method=None): + # XXX If the response includes a content-length header, we + # need to make sure that the client doesn't read more than the + # specified number of bytes. If it does, it will block until + # the server times out and closes the connection. (The only + # applies to HTTP/1.1 connections.) Since some clients access + # self.fp directly rather than calling read(), this is a little + # tricky. + 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 = str(self.fp.readline(), "iso-8859-1") + 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. + # We have to convert the first line back to raw bytes + # because self.fp.readline() needs to return bytes. + self.fp = LineAndFileWrapper(bytes(line, "ascii"), 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(io.BytesIO()) + return + + self.msg = HTTPMessage(self.fp, 0) + if self.debuglevel > 0: + for hdr in self.msg.headers: + print("header:", hdr, end=" ") + + # 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" + self.length = None + length = self.msg.getheader("content-length") + if length and not self.chunked: + try: + self.length = int(length) + except ValueError: + self.length = None + else: + if self.length < 0: # ignore nonsensical negative lengths + 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 indicates 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 + + # These implementations are for the benefit of io.BufferedReader. + + # XXX This class should probably be revised to act more like + # the "raw stream" that BufferedReader expects. + + @property + def closed(self): + return self.isclosed() + + def flush(self): + self.fp.flush() + + # End of "raw stream" methods + + 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 b"" + + 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) + if not self.length: + self.close() + return s + + def _read_chunked(self, amt): + assert self.chunked != _UNKNOWN + chunk_left = self.chunk_left + value = b"" + + # 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(b";") + if i >= 0: + line = line[:i] # strip chunk-extensions + try: + chunk_left = int(line, 16) + except ValueError: + # close the connection as protocol synchronisation is + # probably lost + self.close() + raise IncompleteRead(value) + 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 not line: + # a vanishingly small number of sites EOF without + # sending the trailer + break + if line == b"\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(min(amt, MAXAMOUNT)) + if not chunk: + raise IncompleteRead(s) + s.append(chunk) + amt -= len(chunk) + return b"".join(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 list(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, timeout=None): + self.timeout = timeout + 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__.""" + self.sock = socket.create_connection((self.host,self.port), + self.timeout) + + 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: + blocksize=8192 + if hasattr(str,'read') : + if self.debuglevel > 0: print("sendIng a read()able") + data=str.read(blocksize) + while data: + self.sock.sendall(data) + data=str.read(blocksize) + else: + self.sock.sendall(str) + except socket.error as v: + if v.args[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((b"", b"")) + msg = b"\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 = '/' + request = '%s %s %s' % (method, url, self._http_vsn_str) + + # Non-ASCII characters should have been eliminated earlier + self._output(request.encode('ascii')) + + 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: + try: + netloc_enc = netloc.encode("ascii") + except UnicodeEncodeError: + netloc_enc = netloc.encode("idna") + self.putheader('Host', netloc_enc) + else: + try: + host_enc = self.host.encode("ascii") + except UnicodeEncodeError: + host_enc = self.host.encode("idna") + if self.port == HTTP_PORT: + self.putheader('Host', host_enc) + else: + host_enc = host_enc.decode("ascii") + self.putheader('Host', "%s:%s" % (host_enc, 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() + + if hasattr(header, 'encode'): + header = header.encode('ascii') + if hasattr(value, 'encode'): + value = value.encode('ascii') + header = header + b': ' + value + self._output(header) + + 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 as v: + # trap 'Broken pipe' if we're allowed to automatically reconnect + if v.args[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): + thelen = None + try: + thelen = str(len(body)) + except TypeError as te: + # If this is a file-like object, try to + # fstat its file descriptor + import os + try: + thelen = str(os.fstat(body.fileno()).st_size) + except (AttributeError, OSError): + # Don't send a length if this failed + if self.debuglevel > 0: print("Cannot stat!!") + + if thelen is not None: + self.putheader('Content-Length',thelen) + for hdr, value in headers.items(): + self.putheader(hdr, value) + self.endheaders() + + if body: + if isinstance(body, str): body = body.encode('ascii') + 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 + +try: + import ssl +except ImportError: + pass +else: + 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, timeout=None): + HTTPConnection.__init__(self, host, port, strict, timeout) + self.key_file = key_file + self.cert_file = cert_file + + def connect(self): + "Connect to a host on a given (SSL) port." + + sock = socket.create_connection((self.host, self.port), self.timeout) + self.sock = ssl.wrap_socket(sock, self.key_file, self.cert_file) + + + def FakeSocket (sock, sslobj): + warnings.warn("FakeSocket is deprecated, and won't be in 3.x. " + + "Use the result of ssl.wrap_socket() directly instead.", + DeprecationWarning, stacklevel=2) + return sslobj + + __all__.append("HTTPSConnection") + +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) |