更新douyin/抖音系列视频批量下载器开发.md

douyin/抖音系列视频批量下载器开发.md

+> 📢博客主页：[https://blog.csdn.net/as604049322](https://blog.csdn.net/as604049322)
+>
+> 📢欢迎点赞 👍 收藏 ⭐留言 📝 欢迎讨论！
+>
+> 📢本文由 **小小明-代码实体** 原创，首发于 **CSDN**🙉
+>
+> 📢未来很长，值得我们全力奔赴更美好的生活✨
+
+
+
+# 程序使用演示
+
+开发了一个抖音视频下载器，打开效果如下：
+
+![image-20220126185238314](https://gitee.com/wangzhouming/blogimgs/raw/master/img-202202/20220126191911.png)
+
+如果本地的谷歌游览器之前从来没有访问过抖音主页，点击开始下载按钮会有如下输出：
+
+![image-20220126185757979](https://gitee.com/wangzhouming/blogimgs/raw/master/img-202202/20220126191907.png)
+
+此时我们只需要点击 访问抖音主页，程序则会使用本地的谷歌游览器访问抖音主页。再次点击下载按钮：
+
+![请添加图片描述](https://img-blog.csdnimg.cn/3ba88eadc9984dbc9a6ec2fa216603dc.gif)
+
+可以看到该视频是一个合集视频：
+
+![image-20220126191823743](https://gitee.com/wangzhouming/blogimgs/raw/master/img-202202/20220126191859.png)
+
+那么程序只需要勾选第一个选项即可下载整个合集：
+
+![请添加图片描述](https://img-blog.csdnimg.cn/9fb398a132aa4224af970a18e0f057d6.gif)
+
+这样一次性就将整个合集都下载下来了：
+
+![image-20220126195512020](https://gitee.com/wangzhouming/blogimgs/raw/master/img-202202/20220126195651.png)
+
+# 开发流程
+
+首先根据上一篇文章：[提取谷歌游览器Cookie的五重境界](https://xxmdmst.blog.csdn.net/article/details/122656048)
+
+读取谷歌游览器安装的位置和本地抖音相关的cookie：
+
+```python
+"""
+小小明的代码
+CSDN主页：https://blog.csdn.net/as604049322
+"""
+__author__ = '小小明'
+__time__ = '2022/1/23'
+
+import base64
+import json
+import os
+import sqlite3
+import winreg
+
+import win32crypt
+from cryptography.hazmat.primitives.ciphers.aead import AESGCM
+
+
+def load_local_key(localStateFilePath):
+    "读取chrome保存在json文件中的key再进行base64解码和DPAPI解密得到真实的AESGCM key"
+    with open(localStateFilePath, encoding='u8') as f:
+        encrypted_key = json.load(f)['os_crypt']['encrypted_key']
+    encrypted_key_with_header = base64.b64decode(encrypted_key)
+    encrypted_key = encrypted_key_with_header[5:]
+    key = win32crypt.CryptUnprotectData(encrypted_key, None, None, None, 0)[1]
+    return key
+
+
+def decrypt_value(key, data):
+    "AESGCM解密"
+    nonce, cipherbytes = data[3:15], data[15:]
+    aesgcm = AESGCM(key)
+    plaintext = aesgcm.decrypt(nonce, cipherbytes, None).decode('u8')
+    return plaintext
+
+
+def fetch_host_cookie(host):
+    "获取指定域名下的所有cookie"
+    userDataDir = os.environ['LOCALAPPDATA'] + r'\Google\Chrome\User Data'
+    localStateFilePath = userDataDir + r'\Local State'
+    cookiepath = userDataDir + r'\Default\Cookies'
+    # 97版本已经将Cookies移动到Network目录下
+    if not os.path.exists(cookiepath) or os.stat(cookiepath).st_size == 0:
+        cookiepath = userDataDir + r'\Default\Network\Cookies'
+    # print(cookiepath)
+    sql = f"select name,encrypted_value from cookies where host_key like '%.{host}'"
+    cookies = {}
+    key = load_local_key(localStateFilePath)
+    with sqlite3.connect(cookiepath) as conn:
+        cu = conn.cursor()
+        for name, encrypted_value in cu.execute(sql).fetchall():
+            cookies[name] = decrypt_value(key, encrypted_value)
+    return cookies
+
+
+def get_chrome_path():
+    try:
+        key = winreg.OpenKey(winreg.HKEY_CLASSES_ROOT, r"ChromeHTML\Application")
+        path = winreg.QueryValueEx(key, "ApplicationIcon")[0]
+        chrome_path = path[:path.rfind(",")]
+        return chrome_path
+    except FileNotFoundError as e:
+        return
+
+
+if __name__ == '__main__':
+    print(fetch_host_cookie("douyin.com"))
+    print(get_chrome_path())
+```
+
+有了这个工具类，我们就不再需要使用selenium。
+
+然后是视频解析的核心代码如下：
+
+```python
+def get_video_url(url, cookies):
+    headers = {
+        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.66 Safari/537.36",
+        "referer": "https://www.douyin.com"
+    }
+    res = requests.get(url, headers=headers, cookies=cookies)
+    if res.status_code == 200:
+        RENDER_DATA, = re.findall(
+            r'<script id="RENDER_DATA" type="application/json">([^<>]+)</script>', res.text)
+        data = json.loads(unquote(RENDER_DATA))
+        key = '8' if url.find("collection") != -1 else '34'
+        try:
+            detail = data[key]['aweme']['detail']
+            title = detail['desc']
+        except Exception as e:
+            print(f"{url}无效，报错的key:", e)
+            return
+        if not title:
+            title, = re.findall("<title[^>]+>\s*([^>]+)\s*</title>", res.text)
+        video_url = urljoin(url, detail['video']['playApi'])
+        collection_urls = set(re.findall("//www.douyin.com/collection/\d+/\d+", res.text))
+        collection_urls = [urljoin("https://www.douyin.com", url) for url in collection_urls]
+        collection_urls.sort(key=lambda s: int(s[s.rfind("/") + 1:]))
+
+        collection_title = re.findall("<h2 [^>]+>([^<>]+)</h2>", res.text)[0]
+        return video_url, title, collection_urls, collection_title
+    else:
+        print('视频链接请求失败！！！')
+```
+
+视频下载的核心代码：
+
+```python
+def download_video(video_url, title, folder):
+    start_time = time.time()
+    res = requests.get(url=video_url, stream=True)
+    done_size, total = 0, int(res.headers['content-length'])
+    chunk_size = 1024 * 1024
+    title = format_filename(title)
+    file_size = round(int(res.headers['content-length']) / 1024 / 1024, 2)
+    basename = f"{title}.mp4"
+    filename = f"{folder}/{title}.mp4"
+    if os.path.exists(filename):
+        print(basename, "已存在，跳过...")
+        return
+    print("-----------------------------------")
+    print(f'开始下载文件：{basename}\n当前文件大小：{file_size}MB')
+    with open(filename, 'wb') as f:
+        for chunk in res.iter_content(chunk_size):
+            f.write(chunk)
+            done_size += len(chunk)
+            cost_time = time.time() - start_time
+            yield done_size, cost_time, total
+            # print(f"进度：{done_size / total:.2%},{done_size / cost_time / 1024 / 1024:.2f}MB/s")
+    cost_time = time.time() - start_time
+    print(f'文件：{basename} 下载完成！\n耗时：{cost_time:0.2f} 秒')
+```
+
+> 关于视频链接的分析，大家可以参考才哥的文章：
+>
+> 《[用Python搞定抖X无水印短视频下载](https://mp.weixin.qq.com/s/NNVT6IH6dpT0rTeu1-oD6w)》
+>
+> 链接：https://mp.weixin.qq.com/s/NNVT6IH6dpT0rTeu1-oD6w
+
+UI界面设计核心代码如下：
+
+```python
+layout = [
+    [sg.Text('抖音视频地址：', font=("楷体", 12)),
+     sg.In(key='url', size=(70, 1), text_color="#bb8b59",
+           default_text="https://www.douyin.com/video/6803929443069988103")],
+    [sg.Checkbox('如果是一个合集则下载整个合集', key="download_collection", default=False),
+     sg.Button('开始下载'),
+     sg.Button('清空输出'),
+     sg.Button('访问抖音主页'),
+     sg.Button('访问当前地址'),
+     ],
+    [sg.Output(size=(85, 10), key="out", text_color="#15d36a")],
+    [
+        sg.ProgressBar(1000, size=(20, 20), key='video_bar', bar_color=("#bb8b59", "#295273")),
+        sg.Text('000.0MB,00/00\n00:00<00:00', key="message_video"),
+        sg.ProgressBar(1000, size=(20, 20), key='progressbar', bar_color=("#15d36a", "#295273")),
+        sg.Text('00.00MB/00.00MB\n00.00MB/s', key="message")
+    ],
+    [sg.Text('输出目录：', font=("楷体", 12)),
+     sg.In(size=(35, 1), key="save_dir"),
+     sg.FolderBrowse('...', target='save_dir', initial_folder="."),
+     sg.Checkbox(' 下载完毕后 \n打开所在目录', key="open_folder", default=True),
+     sg.Button('打开输出目录'),
+     ],
+    [sg.Text("@小小明：https://blog.csdn.net/as604049322"), ],
+]
+```
+
+# 程序下载
+
+该工具的完整代码和已打包的工具下载地址：
+
+[https://gitcode.net/as604049322/python_gui/-/tree/master/douyin](https://gitcode.net/as604049322/python_gui/-/tree/master/douyin)
+
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