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import sys
from dataclasses import dataclass
import base64
import binascii
from collections import namedtuple
from typing import Optional
from .._version import __title__, __version__
from .errors import ReplyError
DEFAULT_USER_AGENT = 'Python/{0[0]}.{0[1]} {1}/{2}'.format(
sys.version_info,
__title__,
__version__,
)
CRLF = '\r\n'
class BasicAuth(namedtuple('BasicAuth', ['login', 'password', 'encoding'])):
"""Http basic authentication helper."""
def __new__(cls, login: str, password: str = '', encoding: str = 'latin1') -> 'BasicAuth':
if login is None:
raise ValueError('None is not allowed as login value')
if password is None:
raise ValueError('None is not allowed as password value')
if ':' in login:
raise ValueError('A ":" is not allowed in login (RFC 1945#section-11.1)')
# noinspection PyTypeChecker,PyArgumentList
return super().__new__(cls, login, password, encoding)
@classmethod
def decode(cls, auth_header: str, encoding: str = 'latin1') -> 'BasicAuth':
"""Create a BasicAuth object from an Authorization HTTP header."""
try:
auth_type, encoded_credentials = auth_header.split(' ', 1)
except ValueError:
raise ValueError('Could not parse authorization header.')
if auth_type.lower() != 'basic':
raise ValueError('Unknown authorization method %s' % auth_type)
try:
decoded = base64.b64decode(encoded_credentials.encode('ascii'), validate=True).decode(
encoding
)
except binascii.Error:
raise ValueError('Invalid base64 encoding.')
try:
# RFC 2617 HTTP Authentication
# https://www.ietf.org/rfc/rfc2617.txt
# the colon must be present, but the username and password may be
# otherwise blank.
username, password = decoded.split(':', 1)
except ValueError:
raise ValueError('Invalid credentials.')
# noinspection PyTypeChecker
return cls(username, password, encoding=encoding)
def encode(self) -> str:
"""Encode credentials."""
creds = ('%s:%s' % (self.login, self.password)).encode(self.encoding)
return 'Basic %s' % base64.b64encode(creds).decode(self.encoding)
class _Buffer:
def __init__(self, encoding: str = 'utf-8'):
self._encoding = encoding
self._buffer = bytearray()
def append_line(self, line: str = ""):
if line:
self._buffer.extend(line.encode(self._encoding))
self._buffer.extend(CRLF.encode('ascii'))
def dumps(self) -> bytes:
return bytes(self._buffer)
@dataclass
class ConnectRequest:
host: str
port: int
username: Optional[str]
password: Optional[str]
def dumps(self) -> bytes:
buff = _Buffer()
buff.append_line(f'CONNECT {self.host}:{self.port} HTTP/1.1')
buff.append_line(f'Host: {self.host}:{self.port}')
buff.append_line(f'User-Agent: {DEFAULT_USER_AGENT}')
if self.username and self.password:
auth = BasicAuth(self.username, self.password)
buff.append_line(f'Proxy-Authorization: {auth.encode()}')
buff.append_line()
return buff.dumps()
@dataclass
class ConnectReply:
status_code: int
message: str
@classmethod
def loads(cls, data: bytes) -> 'ConnectReply':
if not data:
raise ReplyError('Invalid proxy response') # pragma: no cover
line = data.split(CRLF.encode('ascii'), 1)[0]
line = line.decode('utf-8', 'surrogateescape')
try:
version, code, *reason = line.split()
except ValueError: # pragma: no cover
raise ReplyError(f'Invalid status line: {line}')
try:
status_code = int(code)
except ValueError: # pragma: no cover
raise ReplyError(f'Invalid status code: {code}')
status_message = " ".join(reason)
if status_code != 200:
msg = f'{status_code} {status_message}'
raise ReplyError(msg, error_code=status_code)
return cls(status_code=status_code, message=status_message)
# noinspection PyMethodMayBeStatic
class Connection:
def send(self, request: ConnectRequest) -> bytes:
return request.dumps()
def receive(self, data: bytes) -> ConnectReply:
return ConnectReply.loads(data)
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