42 lines
1.4 KiB
Python
42 lines
1.4 KiB
Python
"""State-changing requests may originate only from explicitly configured sites.
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The public Hosting & proxy URL can be stored in the database, while the CORS
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environment setting still has its localhost default on an upgraded install.
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Never infer a trusted origin from request Host or forwarded headers.
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"""
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from urllib.parse import urlsplit
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from ..config import settings
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from .public_urls import magent_public_url, valid_public_url
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def _origin(value: str, *, configured_url: bool = False) -> tuple[str, str, int] | None:
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value = str(value or "")
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if any(character.isspace() or ord(character) < 33 or ord(character) == 127 for character in value):
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return None
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if "?" in value or "#" in value:
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return None
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validated = valid_public_url(value)
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if not validated:
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return None
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parsed = urlsplit(value)
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if parsed.username is not None or parsed.password is not None:
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return None
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if not configured_url and parsed.path:
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return None
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return (
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parsed.scheme.lower(),
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parsed.hostname.lower(),
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parsed.port or (443 if parsed.scheme == "https" else 80),
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)
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def is_allowed_request_origin(origin: str) -> bool:
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candidate = _origin(origin)
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if candidate is None:
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return False
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if candidate == _origin(str(settings.cors_allow_origin or "").rstrip("/")):
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return True
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return candidate == _origin(magent_public_url(), configured_url=True)
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