137 lines
4.1 KiB
Python
137 lines
4.1 KiB
Python
import logging
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import os
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import stat
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from contextlib import asynccontextmanager
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from pathlib import Path
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from fastapi import FastAPI, Query, Request, HTTPException
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from fastapi.middleware.cors import CORSMiddleware
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from fastapi.responses import StreamingResponse
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from routers import transcribe, export, ai, captions, audio
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logging.basicConfig(level=logging.INFO)
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logger = logging.getLogger(__name__)
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@asynccontextmanager
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async def lifespan(app: FastAPI):
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logger.info("AI Video Editor backend starting up")
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yield
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logger.info("AI Video Editor backend shutting down")
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app = FastAPI(
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title="AI Video Editor Backend",
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version="0.1.0",
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lifespan=lifespan,
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)
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app.add_middleware(
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CORSMiddleware,
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allow_origins=["*"],
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allow_credentials=True,
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allow_methods=["*"],
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allow_headers=["*"],
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expose_headers=["Content-Range", "Accept-Ranges", "Content-Length"],
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)
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app.include_router(transcribe.router)
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app.include_router(export.router)
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app.include_router(ai.router)
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app.include_router(captions.router)
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app.include_router(audio.router)
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MIME_MAP = {
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".mp4": "video/mp4",
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".mkv": "video/x-matroska",
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".mov": "video/quicktime",
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".avi": "video/x-msvideo",
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".webm": "video/webm",
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".m4a": "audio/mp4",
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".wav": "audio/wav",
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".mp3": "audio/mpeg",
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".flac": "audio/flac",
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}
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@app.get("/file")
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async def serve_local_file(request: Request, path: str = Query(...)):
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"""Stream a local file with HTTP Range support (required for video seeking)."""
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file_path = Path(path)
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if not file_path.is_file():
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logger.warning(f"[serve_file] File not found: {path}")
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raise HTTPException(status_code=404, detail=f"File not found: {path}")
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file_size = file_path.stat().st_size
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content_type = MIME_MAP.get(file_path.suffix.lower(), "application/octet-stream")
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range_header = request.headers.get("range")
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logger.info(
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f"[serve_file] {file_path.name} | size={file_size} | "
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f"type={content_type} | range={range_header or 'none'}"
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)
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if content_type == "application/octet-stream":
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logger.warning(
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f"[serve_file] Unknown MIME type for extension '{file_path.suffix}' — "
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f"browser may fail to decode audio/video for '{file_path.name}'"
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)
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if file_size == 0:
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logger.error(f"[serve_file] File is empty: {path}")
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raise HTTPException(status_code=422, detail=f"File is empty: {path}")
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if range_header:
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try:
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range_spec = range_header.replace("bytes=", "")
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range_start_str, range_end_str = range_spec.split("-")
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range_start = int(range_start_str) if range_start_str else 0
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range_end = int(range_end_str) if range_end_str else file_size - 1
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range_end = min(range_end, file_size - 1)
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except (ValueError, TypeError) as e:
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logger.error(f"[serve_file] Malformed Range header '{range_header}': {e}")
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raise HTTPException(status_code=416, detail=f"Invalid Range header: {range_header}")
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content_length = range_end - range_start + 1
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def iter_range():
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with open(file_path, "rb") as f:
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f.seek(range_start)
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remaining = content_length
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while remaining > 0:
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chunk = f.read(min(65536, remaining))
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if not chunk:
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break
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remaining -= len(chunk)
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yield chunk
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return StreamingResponse(
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iter_range(),
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status_code=206,
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media_type=content_type,
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headers={
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"Content-Range": f"bytes {range_start}-{range_end}/{file_size}",
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"Accept-Ranges": "bytes",
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"Content-Length": str(content_length),
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},
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)
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def iter_file():
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with open(file_path, "rb") as f:
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while chunk := f.read(65536):
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yield chunk
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return StreamingResponse(
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iter_file(),
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media_type=content_type,
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headers={
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"Accept-Ranges": "bytes",
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"Content-Length": str(file_size),
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},
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)
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@app.get("/health")
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async def health():
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return {"status": "ok"}
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