前言

下载B站上指定的UP主所上传的所有视频。废话不多说，让我们愉快地开始吧~

开发工具

** Python版本：**3.6.4

** 相关模块：**

DecryptLogin模块；

argparse模块；

以及一些python自带的模块。

环境搭建

安装Python并添加到环境变量，pip安装需要的相关模块即可。

原理简介

这里简单介绍一下原理吧，因为B站只有在用户登录状态下才能下载1080P的视频。所以我们首先要利用我开源的DecryptLogin库模拟登录B站(毕竟低画质的视频看着不舒服)，这个很简单，几行代码就搞定了：

from DecryptLogin import login
_, session = login.Login().bilibili(username, password)

接下来就是老生常谈的抓包了，进入某个UP主的主页：

首先我们来抓取UP主的基本信息(抓取UP主所有的视频时完全不需要这些信息，只是用来确定你输入的userid是否和你想抓取的用户一致用的)，这个很简单，刷新一下发现：

几行代码就搞定了：

'''根据userid获得该用户基本信息'''
def __getUserInfo(self, userid):
  params = {'mid': userid, 'jsonp': 'jsonp'}
  res = self.session.get(self.user_info_url, params=params, headers=self.headers)
  res_json = res.json()
  user_info = {
          '用户名': res_json['data']['name'],
          '性别': res_json['data']['sex'],
          '个性签名': res_json['data']['sign'],
          '用户等级': res_json['data']['level'],
          '生日': res_json['data']['birthday']
        }
  return user_info

接下来就是下载该UP主的所有视频了，因为感觉搞起来可能比较费时间(年底了时间比较紧张T_T)，所以就直接去you-get的源码里找了找有没有现成的API了，发现主要需要以下三个接口：

'https://space.bilibili.com/ajax/member/getSubmitVideos'
'https://api.bilibili.com/x/web-interface/view'
'https://api.bilibili.com/x/player/playurl'

第一，二个接口用来获取用户所有的视频的基本信息，根据这些信息然后再利用第三个接口来获得视频的下载链接，最后利用调用aria2c下载这些视频就OK了。具体而言，代码实现如下：

'''下载目标用户的所有视频'''
def __downloadVideos(self, userid):
  if not os.path.exists(userid):
    os.mkdir(userid)
  # 非会员用户只能下载到高清1080P
  quality = [('16', '流畅 360P'),
        ('32', '清晰 480P'),
        ('64', '高清 720P'),
        ('74', '高清 720P60'),
        ('80', '高清 1080P'),
        ('112', '高清 1080P+'),
        ('116', '高清 1080P60')][-3]
  # 获得用户的视频基本信息
  video_info = {'aids': [], 'cid_parts': [], 'titles': [], 'links': [], 'down_flags': []}
  params = {'mid': userid, 'pagesize': 30, 'tid': 0, 'page': 1, 'order': 'pubdate'}
  while True:
    res = self.session.get(self.submit_videos_url, headers=self.headers, params=params)
    res_json = res.json()
    for item in res_json['data']['vlist']:
      video_info['aids'].append(item['aid'])
    if len(video_info['aids']) < int(res_json['data']['count']):
      params['page'] += 1
    else:
      break
  for aid in video_info['aids']:
    params = {'aid': aid}
    res = self.session.get(self.view_url, headers=self.headers, params=params)
    cid_part = []
    for page in res.json()['data']['pages']:
      cid_part.append([page['cid'], page['part']])
    video_info['cid_parts'].append(cid_part)
    title = res.json()['data']['title']
    title = re.sub(r"[‘’\/\\\:\*\?\"\<\>\|\s']", ' ', title)
    video_info['titles'].append(title)
  print('共获取到用户ID<%s>的<%d>个视频...' % (userid, len(video_info['titles'])))
  for idx in range(len(video_info['titles'])):
    aid = video_info['aids'][idx]
    cid_part = video_info['cid_parts'][idx]
    link = []
    down_flag = False
    for cid, part in cid_part:
      params = {'avid': aid, 'cid': cid, 'qn': quality, 'otype': 'json', 'fnver': 0, 'fnval': 16}
      res = self.session.get(self.video_player_url, params=params, headers=self.headers)
      res_json = res.json()
      if 'dash' in res_json['data']:
        down_flag = True
        v, a = res_json['data']['dash']['video'][0], res_json['data']['dash']['audio'][0]
        link_v = [v['baseUrl']]
        link_a = [a['baseUrl']]
        if v['backup_url']:
          for item in v['backup_url']:
            link_v.append(item)
        if a['backup_url']:
          for item in a['backup_url']:
            link_a.append(item)
        link = [link_v, link_a]
      else:
        link = [res_json['data']['durl'][-1]['url']]
        if res_json['data']['durl'][-1]['backup_url']:
          for item in res_json['data']['durl'][-1]['backup_url']:
            link.append(item)
      video_info['links'].append(link)
      video_info['down_flags'].append(down_flag)
  # 开始下载
  out_pipe_quiet = subprocess.PIPE
  out_pipe = None
  aria2c_path = os.path.join(os.getcwd(), 'tools/aria2c')
  ffmpeg_path = os.path.join(os.getcwd(), 'tools/ffmpeg')
  for idx in range(len(video_info['titles'])):
    title = video_info['titles'][idx]
    aid = video_info['aids'][idx]
    down_flag = video_info['down_flags'][idx]
    print('正在下载视频<%s>...' % title)
    if down_flag:
      link_v, link_a = video_info['links'][idx]
      # --视频
      url = '"{}"'.format('" "'.join(link_v))
      command = '{} -c -k 1M -x {} -d "{}" -o "{}" --referer="https://www.bilibili.com/video/av{}" {} {}'
      command = command.format(aria2c_path, len(link_v), userid, title+'.flv', aid, "", url)
      process = subprocess.Popen(command, stdout=out_pipe, stderr=out_pipe, shell=True)
      process.wait()
      # --音频
      url = '"{}"'.format('" "'.join(link_a))
      command = '{} -c -k 1M -x {} -d "{}" -o "{}" --referer="https://www.bilibili.com/video/av{}" {} {}'
      command = command.format(aria2c_path, len(link_v), userid, title+'.aac', aid, "", url)
      process = subprocess.Popen(command, stdout=out_pipe, stderr=out_pipe, shell=True)
      process.wait()
      # --合并
      command = '{} -i "{}" -i "{}" -c copy -f mp4 -y "{}"'
      command = command.format(ffmpeg_path, os.path.join(userid, title+'.flv'), os.path.join(userid, title+'.aac'), os.path.join(userid, title+'.mp4'))
      process = subprocess.Popen(command, stdout=out_pipe, stderr=out_pipe_quiet, shell=True)
      process.wait()
      os.remove(os.path.join(userid, title+'.flv'))
      os.remove(os.path.join(userid, title+'.aac'))
    else:
      link = video_info['links'][idx]
      url = '"{}"'.format('" "'.join(link))
      command = '{} -c -k 1M -x {} -d "{}" -o "{}" --referer="https://www.bilibili.com/video/av{}" {} {}'
      command = command.format(aria2c_path, len(link), userid, title+'.flv', aid, "", url)
      process = subprocess.Popen(command, stdout=out_pipe, stderr=out_pipe, shell=True)
      process.wait()
      os.rename(os.path.join(userid, title+'.flv'), os.path.join(userid, title+'.mp4'))
  print('所有视频下载完成, 该用户所有视频保存在<%s>文件夹中...' % (userid))

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