app.py

import shutil
from fastapi import FastAPI, HTTPException
from deezspot.deezloader import DeeLogin
from deezspot.spotloader import SpoLogin
import requests
import os
import logging
import json
from typing import Optional
from fastapi.staticfiles import StaticFiles
from dotenv import load_dotenv
from pydantic import BaseModel
from urllib.parse import quote
from pathlib import Path
import uuid
from fastapi import BackgroundTasks


# Set up logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

app = FastAPI(title="Deezer API")
# Load environment variables
load_dotenv()

# Mount a static files directory to serve downloaded files

os.makedirs("downloads", exist_ok=True)
app.mount("/downloads", StaticFiles(directory="downloads"), name="downloads")

# Deezer API base URL
DEEZER_API_URL = "https://api.deezer.com"

# Base URL for the server
BASE_URL = "https://chrunos-depot.hf.space"

# Deezer ARL token (required for deezspot downloads)
ARL_TOKEN = os.getenv('ARL')

class DownloadRequest(BaseModel):
    url: str
    quality: str
    arl: str



def convert_deezer_short_link_async(short_link: str) -> str:
    try:
        response = requests.get(short_link, allow_redirects=True)
        return response.url
    except requests.RequestException as e:
        print(f"An error occurred: {e}")
        return ""


@app.get("/")
def read_root():
    return {"message": "running"}


# Helper function to get track info
def get_track_info(track_id: str):
    try:
        response = requests.get(f"{DEEZER_API_URL}/track/{track_id}")
        if response.status_code != 200:
            raise HTTPException(status_code=404, detail="Track not found")
        return response.json()
    except requests.exceptions.RequestException as e:
        logger.error(f"Network error fetching track metadata: {e}")
        raise HTTPException(status_code=500, detail=str(e))
    except Exception as e:
        logger.error(f"Error fetching track metadata: {e}")
        raise HTTPException(status_code=500, detail=str(e))


# Fetch track metadata from Deezer API
@app.get("/track/{track_id}")
def get_track(track_id: str):
    return get_track_info(track_id)


# Download a track and return a download URL
@app.post("/download/track")
def download_track(request: DownloadRequest):
    try:
        if request.arl is None or request.arl.strip() == "":
            ARL = ARL_TOKEN
        else:
            ARL = request.arl
        url = request.url
        if 'deezer.page' in url:
            url = convert_deezer_short_link_async(url)
        quality = request.quality
        dl = DeeLogin(arl=ARL)

        if quality not in ["MP3_320", "MP3_128", "FLAC"]:
            raise HTTPException(status_code=400, detail="Invalid quality specified")

        # 提取 track_id （假设 url 格式为 https://api.deezer.com/track/{track_id}）
        track_id = url.split("/")[-1]

        # Fetch track info
        track_info = get_track_info(track_id)
        track_link = track_info.get("link")
        if not track_link:
            raise HTTPException(status_code=404, detail="Track link not found")

        # Sanitize filename
        track_title = track_info.get("title", "track")
        artist_name = track_info.get("artist", {}).get("name", "unknown")
        file_extension = "flac" if quality == "FLAC" else "mp3"
        expected_filename = f"{artist_name} - {track_title}.{file_extension}".replace("/", "_")  # Sanitize filename

        # Clear the downloads directory
        for root, dirs, files in os.walk("downloads"):
            for file in files:
                os.remove(os.path.join(root, file))
            for dir in dirs:
                shutil.rmtree(os.path.join(root, dir))

        # Download the track using deezspot
        logger.info(f"Downloading track: {expected_filename}")
        try:
            # 下载文件的代码
            dl.download_trackdee(
                link_track=track_link,
                output_dir="downloads",
                quality_download=quality,
                recursive_quality=False,
                recursive_download=False
            )
        except Exception as e:
            logger.error(f"Error downloading file: {e}")
            raise HTTPException(status_code=500, detail="File download failed")

        # Recursively search for the file in the downloads directory
        filepath = None
        for root, dirs, files in os.walk("downloads"):
            for file in files:
                if file.endswith(f'.{file_extension}'):
                    filepath = os.path.join(root, file)
                    break
            if filepath:
                break

        if not filepath:
            raise HTTPException(status_code=500, detail=f"{file_extension} file not found after download")
        if filepath:
            file_size = os.path.getsize(filepath)
            logger.info(f"Downloaded file size: {file_size} bytes")

        # Return the download URL
        relative_path = quote(str(os.path.relpath(filepath, "downloads")))
        # Remove spaces from the relative path
        download_url = f"{BASE_URL}/downloads/{relative_path}"
        logger.info(f"Download successful: {download_url}")
        return {"download_url": download_url}
    except Exception as e:
        logger.error(f"Error downloading track: {e}")
        raise HTTPException(status_code=500, detail=str(e))


# Search tracks using Deezer API
@app.get("/search")
def search_tracks(query: str, limit: Optional[int] = 10):
    try:
        response = requests.get(f"{DEEZER_API_URL}/search", params={"q": query, "limit": limit})
        return response.json()
    except requests.exceptions.RequestException as e:
        logger.error(f"Network error searching tracks: {e}")
        raise HTTPException(status_code=500, detail=str(e))
    except Exception as e:
        logger.error(f"Error searching tracks: {e}")
        raise HTTPException(status_code=500, detail=str(e))

# Spotify credentials from environment variables
'''SPOTIFY_USERNAME = os.getenv("SPOTIFY_USERNAME")
SPOTIFY_CREDENTIALS = os.getenv("SPOTIFY_CREDENTIALS")

if not SPOTIFY_USERNAME or not SPOTIFY_CREDENTIALS:
    raise RuntimeError("Spotify credentials not found in environment variables")

# Create a temporary credentials.json file
CREDENTIALS_PATH = "/tmp/credentials.json"
with open(CREDENTIALS_PATH, "w") as f:
    json.dump({
        "username": SPOTIFY_USERNAME,
        "credentials": SPOTIFY_CREDENTIALS,
        "type": "AUTHENTICATION_STORED_SPOTIFY_CREDENTIALS"
    }, f)

# Initialize Spotify client
spo = SpoLogin(credentials_path=CREDENTIALS_PATH)


# 定义请求体模型
class DownloadRequest(BaseModel):
    url: str
    quality: str


def cleanup_dir(dir_path: Path):
    """Background task to clean up directory"""
    try:
        shutil.rmtree(dir_path)
        logger.info(f"Cleaned up directory: {dir_path}")
    except Exception as e:
        logger.error(f"Error cleaning up {dir_path}: {e}")


# Download a Spotify track and return a download URL       
@app.post("/spot-track/{track_id}")
async def download_spotify_track(
    track_id: str,
    background_tasks: BackgroundTasks
):
    try:
        downloads_dir = Path("downloads")
        # Create unique directory for this download
        download_id = uuid.uuid4().hex
        download_dir = downloads_dir / download_id
        download_dir.mkdir(parents=True, exist_ok=True)

        # Download to unique directory
        logger.info(f"Downloading to {download_dir}")
        spo.download_track(
            link_track=f"https://open.spotify.com/track/{track_id}",
            output_dir=str(download_dir),
            quality_download="VERY_HIGH",
            recursive_quality=False,
            recursive_download=False,
            not_interface=False,
            method_save=1
        )

        # Find downloaded file
        filepath = next(download_dir.glob(f"**/*.ogg"), None)
        if not filepath:
            raise HTTPException(status_code=500, detail="File not found after download")

        # Schedule cleanup after response is sent
        #background_tasks.add_task(cleanup_dir, download_dir)

        # Return path with unique directory
        relative_path = quote(str(filepath.relative_to(downloads_dir)))
        return {"download_url": f"{BASE_URL}/downloads/{relative_path}"}

    except Exception as e:
        logger.error(f"Error downloading track: {e}")
        raise HTTPException(status_code=500, detail=str(e))
'''