app.py

from fastapi import FastAPI, HTTPException, Query
from fastapi.responses import JSONResponse
import os
from yt_dlp import YoutubeDL

# Define the FastAPI app
app = FastAPI()

# Directory to save downloaded videos
DOWNLOAD_DIR = "downloads"
os.makedirs(DOWNLOAD_DIR, exist_ok=True)

@app.get("/")
def read_root():
    return {"message": "Welcome to the Instagram Reel Downloader API"}

@app.get("/download/")
def download_instagram_reel(
    reel_url: str = Query(..., description="The URL of the Instagram Reel to download"),
):
    """
    Download an Instagram Reel using yt-dlp and provide a download link.
    
    Args:
        reel_url (str): The URL of the Instagram Reel.
        
    Returns:
        JSONResponse: A JSON object containing the download link.
    """
    if not reel_url:
        raise HTTPException(status_code=400, detail="The 'reel_url' parameter is required.")
    
    # Define yt-dlp options
    ydl_opts = {
        "outtmpl": os.path.join(DOWNLOAD_DIR, "%(title)s.%(ext)s"),
        "quiet": True,  # Suppress yt-dlp's output
        "merge_output_format": "mp4",
    }
    
    try:
        with YoutubeDL(ydl_opts) as ydl:
            info = ydl.extract_info(reel_url, download=True)
            filename = ydl.prepare_filename(info)
            if not os.path.exists(filename):
                raise HTTPException(status_code=500, detail="Failed to download the Reel.")
            
            # Construct the download link
            file_name = os.path.basename(filename)
            download_link = f"http://your-domain.com/files/{file_name}"
            
            return JSONResponse(content={"download_link": download_link})
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"An error occurred: {str(e)}")

@app.get("/files/{file_name}")
def serve_file(file_name: str):
    """
    Serve the downloaded file for users to download.
    """
    file_path = os.path.join(DOWNLOAD_DIR, file_name)
    if not os.path.exists(file_path):
        raise HTTPException(status_code=404, detail="File not found.")
    return FileResponse(path=file_path, filename=file_name, media_type="video/mp4")