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from fastapi import FastAPI, UploadFile, File
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import StreamingResponse, JSONResponse
from midi_utils import process_midi
# We no longer need os or ROOT_PATH here, keeping the code clean.
# Uvicorn with --proxy-headers will handle the path prefix automatically.
app = FastAPI(
title="MIDI Processor API",
description="A pure API backend to process MIDI files, running correctly behind a proxy.",
version="1.0.2", # Version updated for the final fix
)
# --- CORS Middleware (no change) ---
origins = ["*"]
app.add_middleware(
CORSMiddleware,
allow_origins=origins,
allow_credentials=True,
allow_methods=["*"],
allow_headers=["*"],
)
# --- API Endpoints (no change) ---
@app.get("/", tags=["General"])
def read_root():
# The /docs link will now work correctly without us manually building the path.
return {
"message": "Welcome to the MIDI Processor API!",
"status": "ok",
"documentation_url": "/docs" # FastAPI will resolve this correctly now
}
@app.post("/process-midi", tags=["MIDI Processing"])
async def process_midi_file(file: UploadFile = File(..., description="The MIDI file (.mid, .midi) to be processed.")):
if not file.filename.lower().endswith(('.mid', '.midi')):
return JSONResponse(
status_code=400,
content={"error": "Invalid file type. Please upload a .mid or .midi file."}
)
try:
print(f"Processing file: {file.filename}")
midi_data = await file.read()
processed_data_buffer = process_midi(midi_data)
return StreamingResponse(
processed_data_buffer,
media_type="audio/midi",
headers={"Content-Disposition": f"attachment; filename=processed_{file.filename}"}
)
except Exception as e:
print(f"An error occurred while processing the file: {e}")
return JSONResponse(
status_code=500,
content={"error": "An internal server error occurred during MIDI processing.", "detail": str(e)}
) |