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56 lines
1.6 KiB
Python
56 lines
1.6 KiB
Python
from __future__ import annotations
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import re
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from typing import Any, Iterable
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from urllib.parse import urlparse
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_ORIGIN_SEPARATORS = re.compile(r"[,;\n]+")
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def _raw_origin_items(value: Any) -> Iterable[str]:
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if value is None:
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return []
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if isinstance(value, (list, tuple, set)):
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items: list[str] = []
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for item in value:
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items.extend(_raw_origin_items(item))
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return items
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return _ORIGIN_SEPARATORS.split(str(value))
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def normalize_origin(value: Any) -> str:
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"""Normalize a browser Origin value for CORS allowlists.
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Operators often paste values as ``host:port`` or separate multiple origins
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with semicolons. Browsers always send an Origin as ``scheme://host[:port]``.
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This helper makes common deployment input tolerant while keeping the output
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as exact origins for Starlette's CORSMiddleware.
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"""
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origin = str(value or "").strip().rstrip("/")
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if not origin:
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return ""
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if origin in {"*", "null"}:
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return origin
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if "://" not in origin:
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origin = f"http://{origin}"
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try:
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parsed = urlparse(origin)
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except ValueError:
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return origin
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if parsed.scheme in {"http", "https"} and parsed.netloc:
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return f"{parsed.scheme}://{parsed.netloc}".rstrip("/")
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return origin
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def normalize_origins(value: Any) -> list[str]:
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origins: list[str] = []
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seen: set[str] = set()
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for raw in _raw_origin_items(value):
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origin = normalize_origin(raw)
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if origin and origin not in seen:
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origins.append(origin)
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seen.add(origin)
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return origins
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