45 lines
1.3 KiB
Python
45 lines
1.3 KiB
Python
"""Small helpers for route-local upload size caps."""
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import os
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from fastapi import HTTPException, UploadFile
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DEFAULT_CHAT_UPLOAD_MAX_BYTES = 10 * 1024 * 1024
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CHAT_UPLOAD_MAX_BYTES_ENV = "ODYSSEUS_CHAT_UPLOAD_MAX_BYTES"
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def format_byte_limit(limit: int) -> str:
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if limit % (1024 * 1024) == 0:
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return f"{limit // (1024 * 1024)} MB"
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if limit % 1024 == 0:
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return f"{limit // 1024} KB"
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return f"{limit} bytes"
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def read_byte_limit_env(name: str, default: int) -> int:
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raw = os.getenv(name)
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if raw is None or not raw.strip():
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return default
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try:
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limit = int(raw)
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except ValueError as exc:
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raise ValueError(f"{name} must be an integer byte count") from exc
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if limit < 1:
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raise ValueError(f"{name} must be greater than 0")
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return limit
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def get_chat_upload_max_bytes() -> int:
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return read_byte_limit_env(CHAT_UPLOAD_MAX_BYTES_ENV, DEFAULT_CHAT_UPLOAD_MAX_BYTES)
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async def read_upload_limited(upload: UploadFile, limit: int, label: str = "Upload") -> bytes:
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"""Read an UploadFile with a hard byte cap."""
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data = await upload.read(limit + 1)
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if len(data) > limit:
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raise HTTPException(
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status_code=413,
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detail=f"{label} exceeds {format_byte_limit(limit)} limit",
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)
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return data
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