# 从网易云音乐下载歌单歌曲
# 参考了这些网址
# https://blog.csdn.net/Ciiiiiing/article/details/62434438
# https://github.com/kunkun1230/Python-/tree/master/%E7%BD%91%E6%98%93%E4%BA%91%E9%9F%B3%E4%B9%90%20%E4%B8%8D%E5%86%8D%E7%8A%B9%E8%B1%AB%20%E8%AF%84%E8%AE%BA%E5%88%86%E6%9E%90
# https://www.zhihu.com/question/36081767

from Crypto.Cipher import AES
from bs4 import BeautifulSoup
import base64
import requests
import urllib.request
import os
import time

path = '../../files/网易云音乐'
flag = os.path.exists(path)
if not flag:
   os.mkdir(path)

# 头部信息 #需根据自己浏览器的信息进行替换
headers = {
       'Referer': 'http://music.163.com/',
       'Host': 'music.163.com',
       'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Firefox/38.0 Iceweasel/38.3.0',
       'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8'
   }

# 获取参数
def get_params(text):
   first_key = "0CoJUm6Qyw8W8jud"
   second_key = "FFFFFFFFFFFFFFFF"
   h_encText = AES_encrypt(text, first_key)
   h_encText = AES_encrypt(h_encText, second_key)
   return h_encText

# 获取 encSecKey
def get_encSecKey():
   encSecKey = "257348aecb5e556c066de214e531faadd1c55d814f9be95fd06d6bff9f4c7a41f831f6394d5a3fd2e3881736d94a02ca919d952872e7d0a50ebfa1769a7a62d512f5f1ca21aec60bc3819a9c3ffca5eca9a0dba6d6f7249b06f5965ecfff3695b54e1c28f3f624750ed39e7de08fc8493242e26dbc4484a01c76f739e135637c"
   return encSecKey


# 加密过程
def AES_encrypt(text, key):
   iv = "0102030405060708"
   pad = 16 - len(text) % 16
   text = text + pad * chr(pad)
   encryptor = AES.new(key, AES.MODE_CBC, iv)
   encrypt_text = encryptor.encrypt(text)
   encrypt_text = base64.b64encode(encrypt_text)
   encrypt_text = str(encrypt_text, encoding="utf-8")  # 注意一定要加上这一句，没有这一句则出现错误
   return encrypt_text

# 下载歌曲
def get_mp3(name, song_id):
   url = "http://music.163.com/weapi/song/enhance/player/url?csrf_token="  # 网易歌曲前缀

   first_param = '{ids:"[%s]", br:"128000", csrf_token:""}' % song_id
   data = {
       "params": get_params(first_param).encode('utf-8'),
       "encSecKey": get_encSecKey()
   }

   try:
       response = requests.post(url, headers=headers, data=data)
       result = response.json()

       if result['code'] != 200:
           print('!!! 歌曲[%s]下载失败...' % name)
           return

       mp3_url = result['data'][0]['url']
       urllib.request.urlretrieve(mp3_url, os.path.join('../../files/网易云音乐', name + '.mp3'))
       print('歌曲[%s]下载完成...' % name)
   except:
       print('!!!歌曲[%s]下载出现异常...' % name)

if __name__ == "__main__":
   print('开始下载歌曲...\n================================================')
   start_time = time.time()  # 开始时间
   play_url = 'http://music.163.com/playlist?id=393565693'  # 歌单-民谣还在路上

   s = requests.session()
   s = BeautifulSoup(s.get(play_url, headers=headers).content, 'lxml')
   main = s.select('ul.f-hide li a')

   for music in main:
       song_id = music['href'][music['href'].find('id=') + len('id='):]
       # print('歌曲名称：{},歌曲Id：{}'.format(music.text, song_id))
       get_mp3(music.text, song_id)

   end_time = time.time()  # 结束时间
   print("程序耗时%f秒." % (end_time - start_time))