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"""HTTP Messages
This modules contains classes for representing HTTP responses and requests.
"""
import re
import encodings
import regexes as r
import weblogging as logging
reasondict = {
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',
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 Time-out',
409 : 'Conflict',
410 : 'Gone',
411 : 'Length Required',
412 : 'Precondition Failed',
413 : 'Request Entity Too Large',
414 : 'Request-URI Too Large',
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 Time-out',
505 : 'HTTP Version not supported',
}
class Message(object):
"""Class that stores an HTTP Message"""
def __init__(self):
"""Initialize the Message"""
self.version = "HTTP/1.1"
self.body = ""
self.headers = dict()
def set_header(self, name, value):
"""Add a header and its value
Args:
name (str): name of header
value (str): value of header
"""
self.headers[name] = str(value)
def get_header(self, name):
"""Get the value of a header
Args:
name (str): name of header
Returns:
str: value of header, empty if header does not exist
"""
if name in self.headers:
return self.headers[name]
else:
return None
def parse_headers(self, msg):
for name, value in re.findall(r.MessageHeader, msg):
self.set_header(name, value.strip())
logging.debug("%s: %s" % (name, value.strip()))
def startline(self):
return ''
def __str__(self):
"""Convert the Message to a string
Returns:
str: representation the can be sent over socket
"""
msg = ''
msg += '%s\r\n' % self.startline()
msg += '\r\n'.join([k + ": " + v for k, v in self.headers.iteritems()])
msg += '\r\n\r\n' + self.body
return msg
def __eq__(self, other):
return self.__dict__ == other.__dict__
class Request(Message):
"""Class that stores an HTTP request"""
def __init__(self):
"""Initialize the Request"""
super(Request, self).__init__()
self.method = ""
self.uri = ""
def parse(self, msg):
[reqline, rest] = msg.split('\r\n', 1)
reqline = re.match(r.RequestLine, reqline + '\r\n')
self.method, self.uri, self.version = reqline.groups()
[headers, body] = rest.split('\r\n\r\n', 1)
self.parse_headers(headers)
self.body = body
def encodings(self):
requested = self.get_header('Accept-Encoding')
if requested == None:
return encodings.all
encs = []
requested = re.split(r.EncodingSplit, requested)
for value in requested:
try:
match = re.match(r.AcceptEncodingValue, value)
if match == None:
return [encodings.IDENTITY]
enc, q = match.groups()
# Unclear what should happen when some qvalues are omitted
q = q or '0.001'
if enc == '*':
for enc in encodings.all:
encs.append((encodings.get(enc), float(q)))
else:
encs.append((encodings.get(enc), float(q)))
except encodings.UnknownEncodingError:
pass
rejected = [e[0] for e in encs if e[1] == 0]
accepted = [e for e in encs if e[1] != 0]
if not encodings.IDENTITY in rejected + [a[0] for a in accepted]:
accepted.append((encodings.IDENTITY, 0.001))
accepted.sort(key=lambda x:x[1], reverse=True)
return [a[0] for a in accepted]
def startline(self):
return "%s %s %s" % (self.method, self.uri, self.version)
def __str__(self):
"""Convert the Request to a string
Returns:
str: representation the can be sent over socket
"""
return super(Request, self).__str__()
class Response(Message):
"""Class that stores an HTTP Response"""
def __init__(self):
"""Initialize the Response"""
super(Response, self).__init__()
self.set_header('Server', 'WebPy')
def parse(self, msg):
[respline, rest] = msg.split('\r\n', 1)
respline = re.match(r.StatusLine, respline + '\r\n')
self.version = respline.group(1)
self.code = int(respline.group(2))
[headers, body] = rest.split('\r\n\r\n', 1)
self.parse_headers(headers)
self.body = body
def startline(self):
return "%s %d %s" % (self.version, self.code, reasondict[self.code])
def set_content_length(self):
self.set_header('Content-Length', len(self.body))
def decompress(self):
self.body = encodings.decode(
self.get_header('Content-Encoding'), self.body)
def __str__(self):
"""Convert the Response to a string
Returns:
str: representation the can be sent over socket
"""
return super(Response, self).__str__()
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