28 lines
868 B
Python
28 lines
868 B
Python
"""Resolve client IP behind reverse proxy (nginx $proxy_add_x_forwarded_for)."""
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from __future__ import annotations
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from fastapi import Request
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def client_ip_from_request(request: Request) -> str:
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"""Client IP for rate limiting.
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nginx with ``proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for``
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appends the real peer address as the *last* hop. Spoofed values in the
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incoming header therefore cannot replace the actual client IP.
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"""
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if request.client and request.client.host:
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direct = request.client.host.strip()
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else:
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direct = "unknown"
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forwarded = (request.headers.get("x-forwarded-for") or "").strip()
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if not forwarded:
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return direct[:64]
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parts = [part.strip() for part in forwarded.split(",") if part.strip()]
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if not parts:
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return direct[:64]
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return parts[-1][:64]
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