http.py

import sys
import types
import re

PY3 = sys.version_info[0] == 3

class BaseClass(object):
    def __repr__(self):
        ret = self.__str__()
        if PY3:  # pragma: no cover
            return ret
        else:
            return ret.encode('utf-8')

STATUSES = {
    100: "Continue",
    101: "Switching Protocols",
    102: "Processing",
    200: "OK",
    201: "Created",
    202: "Accepted",
    203: "Non-Authoritative Information",
    204: "No Content",
    205: "Reset Content",
    206: "Partial Content",
    207: "Multi-Status",
    208: "Already Reported",
    226: "IM Used",
    300: "Multiple Choices",
    301: "Moved Permanently",
    302: "Found",
    303: "See Other",
    304: "Not Modified",
    305: "Use Proxy",
    306: "Switch Proxy",
    307: "Temporary Redirect",
    308: "Permanent 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 a 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",
    418: "I'm a teapot",
    420: "Enhance Your Calm",
    422: "Unprocessable Entity",
    423: "Locked",
    424: "Failed Dependency",
    424: "Method Failure",
    425: "Unordered Collection",
    426: "Upgrade Required",
    428: "Precondition Required",
    429: "Too Many Requests",
    431: "Request Header Fields Too Large",
    444: "No Response",
    449: "Retry With",
    450: "Blocked by Windows Parental Controls",
    451: "Unavailable For Legal Reasons",
    451: "Redirect",
    494: "Request Header Too Large",
    495: "Cert Error",
    496: "No Cert",
    497: "HTTP to HTTPS",
    499: "Client Closed Request",
    500: "Internal Server Error",
    501: "Not Implemented",
    502: "Bad Gateway",
    503: "Service Unavailable",
    504: "Gateway Timeout",
    505: "HTTP Version Not Supported",
    506: "Variant Also Negotiates",
    507: "Insufficient Storage",
    508: "Loop Detected",
    509: "Bandwidth Limit Exceeded",
    510: "Not Extended",
    511: "Network Authentication Required",
    598: "Network read timeout error",
    599: "Network connect timeout error",
}


class HttpBaseClass(BaseClass):
    GET = 'GET'
    PUT = 'PUT'
    POST = 'POST'
    DELETE = 'DELETE'
    HEAD = 'HEAD'
    PATCH = 'PATCH'
    OPTIONS = 'OPTIONS'
    CONNECT = 'CONNECT'
    METHODS = (GET, PUT, POST, DELETE, HEAD, PATCH, OPTIONS, CONNECT)


def parse_requestline(s):
    """
    http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5
    >>> parse_requestline('GET / HTTP/1.0')
    ('GET', '/', '1.0')
    >>> parse_requestline('post /testurl htTP/1.1')
    ('POST', '/testurl', '1.1')
    >>> parse_requestline('Im not a RequestLine')
    Traceback (most recent call last):
        ...
    ValueError: Not a Request-Line
    """
    methods = '|'.join(HttpBaseClass.METHODS)
    m = re.match(r'(' + methods + ')\s+(.*)\s+HTTP/(1.[0|1])', s, re.I)
    if m:
        return m.group(1).upper(), m.group(2), m.group(3)
    else:
        raise ValueError('Not a Request-Line')


def last_requestline(sent_data):
    """
    Find the last line in sent_data that can be parsed with parse_requestline
    """
    for line in reversed(sent_data):
        try:
            parse_requestline(decode_utf8(line))
        except ValueError:
            pass
        else:
            return line

if __name__ == '__main__':
    print parse_requestline('post /testurl htTP/1.1')