91 lines
2.6 KiB
Python
91 lines
2.6 KiB
Python
"""Blob storage router: upload and retrieve binary assets in the database."""
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import uuid
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from fastapi import APIRouter, Depends, HTTPException, Response, UploadFile, status
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from app.auth import get_current_admin_user
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from app.database import get_session
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from app.models import StorageBlob
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from app.user_models import User
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from sqlalchemy import select
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from sqlalchemy.ext.asyncio import AsyncSession
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router = APIRouter()
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ALLOWED_MIME_TYPES = {"image/png", "image/jpeg", "image/webp", "image/avif"}
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MAX_FILE_SIZE = 5 * 1024 * 1024 # 5 MB
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# Magic byte signatures → MIME type
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MAGIC_BYTES = {
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b'\x89PNG\r\n\x1a\n': 'image/png',
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b'\xff\xd8\xff': 'image/jpeg',
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b'\x00\x00\x00\x1cftypavif': 'image/avif',
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b'\x00\x00\x00\x20ftypwebp': 'image/webp',
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}
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@router.post("/upload")
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async def upload_blob(
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file: UploadFile,
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session: AsyncSession = Depends(get_session),
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current_user: User = Depends(get_current_admin_user),
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):
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"""Upload an image blob. Admin only.
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Validates magic bytes, stores binary in PostgreSQL, returns a URL path.
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"""
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# Read and validate size
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content = await file.read()
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if len(content) > MAX_FILE_SIZE:
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raise HTTPException(
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status_code=status.HTTP_400_BAD_REQUEST,
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detail="File size exceeds 5 MB limit",
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)
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# Validate magic bytes
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detected_type = None
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for magic, mime_type in MAGIC_BYTES.items():
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if content.startswith(magic):
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detected_type = mime_type
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break
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if detected_type is None:
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raise HTTPException(
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status_code=status.HTTP_400_BAD_REQUEST,
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detail="File type not supported. Only PNG, JPEG, WebP, and AVIF are allowed.",
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)
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# Generate unique blob_id and insert
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blob_id = uuid.uuid4().hex
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blob = StorageBlob(
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blob_id=blob_id,
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content_type=detected_type,
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size=len(content),
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data=content,
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)
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session.add(blob)
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await session.commit()
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return {"url": f"/api/storage/{blob_id}"}
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@router.get("/{blob_id}")
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async def get_blob(blob_id: str, session: AsyncSession = Depends(get_session)):
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"""Retrieve a stored blob by blob_id. Public endpoint."""
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result = await session.execute(
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select(StorageBlob).where(StorageBlob.blob_id == blob_id)
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)
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blob = result.scalar_one_or_none()
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if blob is None:
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raise HTTPException(
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status_code=status.HTTP_404_NOT_FOUND,
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detail="Blob not found",
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)
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return Response(
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content=blob.data,
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media_type=blob.content_type,
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headers={"Content-Length": str(blob.size)},
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)
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