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"""Authenticating HTTP Server
This module builds on BaseHTTPServer and implements basic authentication
"""
import base64
import binascii
import BaseHTTPServer
DEFAULT_AUTH_ERROR_MESSAGE = """
<head>
<title>%(code)s - %(message)s</title>
</head>
<body>
<h1>Authorization Required</h1>
this server could not verify that you
are authorized to access the document
requested. Either you supplied the wrong
credentials (e.g., bad password), or your
browser doesn't understand how to supply
the credentials required.
</body>"""
def _quote_html(html):
return html.replace("&", "&").replace("<", "<").replace(">", ">")
class AuthRequestHandler(BaseHTTPServer.BaseHTTPRequestHandler):
"""
Simple handler that can check for auth headers
In your subclass you have to define the method get_userinfo(user, password)
which should return 1 or None depending on whether the password was
ok or not. None means that the user is not authorized.
"""
# False means no authentiation
DO_AUTH = 1
def parse_request(self):
if not BaseHTTPServer.BaseHTTPRequestHandler.parse_request(self):
return False
if self.DO_AUTH:
authorization = self.headers.get('Authorization', '')
if not authorization:
self.send_autherror(401, "Authorization Required")
return False
scheme, credentials = authorization.split()
if scheme != 'Basic':
self.send_error(501)
return False
credentials = base64.decodestring(credentials)
user, password = credentials.split(':', 2)
if not self.get_userinfo(user, password, self.command):
self.send_autherror(401, "Authorization Required")
return False
return True
def send_autherror(self, code, message=None):
"""Send and log an auth error reply.
Arguments are the error code, and a detailed message.
The detailed message defaults to the short entry matching the
response code.
This sends an error response (so it must be called before any
output has been generated), logs the error, and finally sends
a piece of HTML explaining the error to the user.
"""
try:
short, long = self.responses[code]
except KeyError:
short, long = '???', '???'
if message is None:
message = short
explain = long
self.log_error("code %d, message %s", code, message)
# using _quote_html to prevent Cross Site Scripting attacks (see bug
# #1100201)
content = (self.error_auth_message_format % {'code': code, 'message':
_quote_html(message), 'explain': explain})
self.send_response(code, message)
self.send_header('Content-Type', self.error_content_type)
self.send_header('WWW-Authenticate', 'Basic realm="PyWebDAV"')
self.send_header('Connection', 'close')
self.end_headers()
self.wfile.write(content)
error_auth_message_format = DEFAULT_AUTH_ERROR_MESSAGE
def get_userinfo(self, user, password, command):
"""Checks if the given user and the given
password are allowed to access.
"""
# Always reject
return None