Simple web backend added with upload/status/process/download API

web/backend/api/upload.py

@@ -0,0 +1,58 @@
+"""File upload endpoint."""
+
+import uuid
+import shutil
+from pathlib import Path
+
+from fastapi import APIRouter, UploadFile, File, HTTPException
+
+from backend.config import settings
+from backend.models.response import UploadResponse
+from backend.services.task_manager import task_manager
+
+router = APIRouter(prefix="/api", tags=["upload"])
+
+ALLOWED_EXTENSIONS = {
+    ".mp3", ".flac", ".wav", ".m4a", ".ogg", ".opus",
+    ".aac", ".wma", ".aiff", ".alac", ".ac3"
+}
+
+
+@router.post("/upload", response_model=UploadResponse)
+async def upload_file(file: UploadFile = File(...)):
+    extension = Path(file.filename).suffix.lower()
+    if extension not in ALLOWED_EXTENSIONS:
+        raise HTTPException(
+            status_code=400,
+            detail=f"Unsupported file format. Allowed: {', '.join(sorted(ALLOWED_EXTENSIONS))}"
+        )
+
+    task_id = str(uuid.uuid4())[:8]
+    task_dir = settings.temp_dir / task_id
+    task_dir.mkdir(parents=True, exist_ok=True)
+
+    input_path = task_dir / f"input{extension}"
+    try:
+        with open(input_path, "wb") as buffer:
+            shutil.copyfileobj(file.file, buffer)
+    except Exception as e:
+        shutil.rmtree(task_dir, ignore_errors=True)
+        raise HTTPException(status_code=500, detail=f"Failed to save file: {str(e)}")
+
+    file_size = input_path.stat().st_size
+    max_size_bytes = settings.max_upload_size_mb * 1024 * 1024
+    if file_size > max_size_bytes:
+        shutil.rmtree(task_dir, ignore_errors=True)
+        raise HTTPException(
+            status_code=400,
+            detail=f"File too large. Maximum size: {settings.max_upload_size_mb} MB"
+        )
+
+    # Create task entry in the task manager
+    task_manager.create_task(task_id, file.filename, file_size)
+
+    return UploadResponse(
+        task_id=task_id,
+        filename=file.filename,
+        size=file_size
+    )