23 lines
987 B
Python
23 lines
987 B
Python
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import base64
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import binascii
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from starlette.authentication import (
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AuthCredentials, AuthenticationBackend, AuthenticationError, SimpleUser
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)
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class BasicAuthBackend(AuthenticationBackend):
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async def authenticate(self, conn):
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if "Authorization" not in conn.headers:
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raise AuthenticationError('No Authorization header provided')
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auth = conn.headers["Authorization"]
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try:
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scheme, credentials = auth.split()
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if scheme.lower() != 'basic':
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raise AuthenticationError('Invalid authorization scheme')
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decoded = base64.b64decode(credentials).decode("ascii")
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except (ValueError, UnicodeDecodeError, binascii.Error) as exc:
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raise AuthenticationError('Invalid basic auth credentials')
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username, _, password = decoded.partition(":")
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# TODO: You'd want to verify the username and password here.
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return AuthCredentials(["authenticated"]), SimpleUser(username)
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