項目地址是：https://www.chenshiyang.com/dytk

接下來我們分析下源碼簡要看下實現原理。

該項目不需要使用模型(models), 最核心的只有兩個頁面：一個主頁面(home)展示包含下載url地址的表單，一個下載頁面(download)處理表單請求，并展示去水印后的視頻文件地址及文件大小，以及用于手機預覽的二維碼。

對應兩個核心頁面的路由如下所示，每個url對應一個視圖函數。

from django.urls import pathfrom web.views import home, downloadurlpatterns = [ path(’home’, home), path(’downloader’, download),]#web/urls.py

from django.http import HttpResponsefrom django.shortcuts import render, redirect# Create your views here.from common.utils import format_duration, load_mediafrom common.DouYin import DYdef home(request): '''首頁''' return render(request, ’home.html’)def download(request): '''下載''' url = request.POST.get(’url’, None) assert url != None dy = DY() data = dy.parse(url) mp4_path, mp4_content_length = load_media(data[’mp4’], ’mp4’) mp3_path, mp3_content_length = load_media(data[’mp3’], ’mp3’) realpath = ’’.join([’https://www.chenshiyang.com’, mp4_path]) print(’realpath---------------------’, realpath) if len(data[’desc’].split(’#’)) > 2:topic = data[’desc’].split(’#’)[2].rstrip(’#’) return render(request, ’download.html’, locals())

可以看出通過home頁面表單提交過來的下載url會交由download函數處理。common模塊的DouYin.py中定義的DY類負責對url繼續解析，爬取相關視頻地址，通過自定義utils.py中的load_media方法下載文件，并返回文件路徑以及文件大小。

由于解析下載url，從抖音爬取數據的代碼都封裝到DY類里了，所以我們有必要貼下這個類的代碼。另外，我們還需要貼下load_media這個方法的代碼。

# -*- coding: utf-8 -*-# @Time : 2020-07-03 13:10# @Author : chenshiyang# @Email : chenshiyang@blued.com# @File : DouYin.py# @Software: PyCharmimport refrom urllib.parse import urlparseimport requestsfrom common.utils import format_durationclass DY(object): def __init__(self, app=None):self.app = appif app is not None: self.init_app(app)self.headers = { ’accept’: ’text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9’, # ’accept-encoding’: ’gzip, deflate, br’, ’accept-language’: ’zh-CN,zh;q=0.9’, ’cache-control’: ’no-cache’, ’cookie’: ’sid_guard=2e624045d2da7f502b37ecf72974d311%7C1591170698%7C5184000%7CSun%2C+02-Aug-2020+07%3A51%3A38+GMT; uid_tt=0033579d9229eec4a4d09871dfc11271; sid_tt=2e624045d2da7f502b37ecf72974d311; sessionid=2e624045d2da7f502b37ecf72974d311’, ’pragma’: ’no-cache’, ’sec-fetch-dest’: ’document’, ’sec-fetch-mode’: ’navigate’, ’sec-fetch-site’: ’none’, ’sec-fetch-user’: ’?1’, ’upgrade-insecure-requests’: ’1’, ’user-agent’: ’Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Mobile/15E148 Safari/604.1’}self.domain = [’www.douyin.com’, ’v.douyin.com’, ’www.snssdk.com’, ’www.amemv.com’, ’www.iesdouyin.com’, ’aweme.snssdk.com’] def init_app(self, app):self.app = app def parse(self, url):share_url = self.get_share_url(url)share_url_parse = urlparse(share_url)if share_url_parse.netloc not in self.domain: raise Exception('無效的鏈接')dytk = Nonevid = re.findall(r’/share/video/(d*)’, share_url_parse.path)[0]match = re.search(r’/share/video/(d*)’, share_url_parse.path)if match: vid = match.group(1)response = requests.get( share_url, headers=self.headers, allow_redirects=False)match = re.search(’dytk: '(.*?)'’, response.text)if match: dytk = match.group(1)if vid: return self.get_data(vid, dytk)else: raise Exception('解析失敗') def get_share_url(self, url):response = requests.get(url,headers=self.headers,allow_redirects=False)if ’location’ in response.headers.keys(): return response.headers[’location’]elif ’/share/video/’ in url: return urlelse: raise Exception('解析失敗') def get_data(self, vid, dytk):url = f'https://www.iesdouyin.com/web/api/v2/aweme/iteminfo/?item_ids={vid}&dytk={dytk}'response = requests.get(url, headers=self.headers, )result = response.json()if not response.status_code == 200: raise Exception('解析失敗')item = result.get('item_list')[0]author = item.get('author').get('nickname')mp4 = item.get('video').get('play_addr').get('url_list')[0]cover = item.get('video').get('cover').get('url_list')[0]mp4 = mp4.replace('playwm', 'play')res = requests.get(mp4, headers=self.headers, allow_redirects=True)mp4 = res.urldesc = item.get('desc')mp3 = item.get('music').get('play_url').get('url_list')[0]data = dict()data[’mp3’] = mp3data[’mp4’] = mp4data[’cover’] = coverdata[’nickname’] = authordata[’desc’] = descdata[’duration’] = format_duration(item.get('duration'))return data

從代碼你可以看到返回的data字典里包括了mp3和mp4源文件地址，以及視頻的封面，作者昵稱及描述等等。

接下來你可以看到load_media方法爬取了視頻到本地，并提供了新的path和大小。

# -*- coding: utf-8 -*-# @Time : 2020-06-29 17:26# @Author : chenshiyang# @Email : chenshiyang@blued.com# @File : utils.py# @Software: PyCharmimport osimport timeimport requestsdef format_duration(duration): ''' 格式化時長 :param duration 毫秒 ''' total_seconds = int(duration / 1000) minute = total_seconds // 60 seconds = total_seconds % 60 return f’{minute:02}:{seconds:02}’SUFFIXES = {1000: [’KB’, ’MB’, ’GB’, ’TB’, ’PB’, ’EB’, ’ZB’, ’YB’], 1024: [’KiB’, ’MiB’, ’GiB’, ’TiB’, ’PiB’, ’EiB’, ’ZiB’, ’YiB’]}def approximate_size(size, a_kilobyte_is_1024_bytes=True): ’’’Convert a file size to human-readable form. Keyword arguments: size -- file size in bytes a_kilobyte_is_1024_bytes -- if True (default), use multiples of 1024if False, use multiples of 1000 Returns: string ’’’ if size < 0:raise ValueError(’number must be non-negative’) multiple = 1024 if a_kilobyte_is_1024_bytes else 1000 for suffix in SUFFIXES[multiple]:size /= multipleif size < multiple: return ’{0:.1f} {1}’.format(size, suffix) raise ValueError(’number too large’)def do_load_media(url, path): ''' 對媒體下載 :param url: 多媒體地址 :param path:文件保存路徑 :return: None ''' try:headers = { 'User-Agent': 'Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Mobile/15E148 Safari/604.1'}pre_content_length = 0# 循環接收視頻數據while True: # 若文件已經存在，則斷點續傳，設置接收來需接收數據的位置 if os.path.exists(path):headers[’Range’] = ’bytes=%d-’ % os.path.getsize(path) res = requests.get(url, stream=True, headers=headers) content_length = int(res.headers[’content-length’]) # 若當前報文長度小于前次報文長度，或者已接收文件等于當前報文長度，則可以認為視頻接收完成 if content_length < pre_content_length or ( os.path.exists(path) and os.path.getsize(path) == content_length):break pre_content_length = content_length # 寫入收到的視頻數據 with open(path, ’ab’) as file:file.write(res.content)file.flush()print(’receive data，file size : %d total size:%d’ % (os.path.getsize(path), content_length))return approximate_size(content_length, a_kilobyte_is_1024_bytes=False) except Exception as e:print(’視頻下載異常:{}’.format(e))def load_media(url, path): basepath = os.path.abspath(os.path.dirname(os.path.dirname(__file__))) # 生成13位時間戳 suffixes = str(int(round(time.time() * 1000))) path = ’’.join([’/media/’, path, ’/’, ’.’.join([suffixes, path])]) targetpath = ’’.join([basepath, path]) content_length = do_load_media(url, targetpath) return path, content_lengthdef main(url, suffixes, path): load_media(url, suffixes, path)if __name__ == '__main__': # url = ’https://aweme.snssdk.com/aweme/v1/play/?video_id=v0200fe70000br155v26tgq06h08e0lg&ratio=720p&line=0’ # suffixes = ’test’ # main(url, suffixes, ’mp4’,) print(approximate_size(3726257, a_kilobyte_is_1024_bytes=False))

接下來我們看下模板, 這個沒什么好說的。

{% extends 'base.html' %}{% block content %} <div class='jumbotron custom-jum no-mrg'> <div class='container'> <div class='row'><div class='col-md-12'> <div class='center'> <div class='home-search'> <h1>抖音無水印視頻下載器</h1> <h2>將抖音無水印視頻下載到Mp4和Mp3</h2> </div> <div class='form-home-search'> <form action=’https://www.chenshiyang.com/dytk/downloader’ method=’POST’><div class='input-group col-lg-10 col-md-10 col-sm-10'> <input name='url' placeholder='輸入抖音視頻 URL ...' type='text' required='' value=''> <span class='input-group-btn'><button type='submit' id='btn_submit'>下載</button></span></div> </form> </div> </div></div> </div> </div> </div> </div> {% endblock %}# templates/download.html

{% extends 'base.html' %}{% block content %} <div class='page-content'> <div class='container'> <div class='row'> <div class='col-lg-12 col-centered'><div class='ads mrg-bt20 text-center'> <insdata-ad-client='ca-pub-2984659695526033' data-ad-slot='5734284394'></ins></div><div class='card'> <div class='row'> <div class='col-md-4 col-sm-4'> <a href='http://m.b3g6.com/bcjs/{{mp4_path}}' rel='external nofollow' rel='external nofollow' data-toggle='modal' ><span class='btn-play-video'><i class='glyphicon glyphicon-play'></i></span><p id='time'>{{data.duration}}</p> </a> <h5>作者: {{data.nickname}}</h5> <h5><a href='http://m.b3g6.com/bcjs/17035.html#' rel='external nofollow' >{{topic}} <i class='open-new-window'></i></a></h5> <p class='card-text'>{{data.desc}}</p> </div> <div class='col-md-8 col-sm-8 col-table'> <table class='table'><thead> <tr> <th>format</th> <th>size</th> <th>Downloads</th> </tr></thead><tbody> <tr> <td>mp4</td> <td>{{mp4_content_length}}</td> <td> <a href='http://m.b3g6.com/bcjs/{{mp4_path}}' rel='external nofollow' rel='external nofollow' download=''>下載</a> </td> </tr> <tr> <td>mp3</td> <td>{{mp3_content_length}}</td> <td> <a href='http://m.b3g6.com/bcjs/{{mp3_path}}' rel='external nofollow' download=''>下載</a> </td> </tr></tbody> </table> </div> </div></div><div class='card card-qrcode'> <div class='row'> <div class='col-md-12 qrcode'> <div class='text-center'><p class='qrcode-p'>掃描下面的二維碼直接下載到您的智能手機或平板電腦！</p> </div> </div> <div class='col-md-4 col-centered qrcode'> <div ><script src='https://rkxy.com.cn/static/js/qrcode.min.js'></script><script type='text/javascript'> new QRCode(document.getElementById('qrcode'), { text: '{{realpath}}', width: 120, height: 120, correctLevel: QRCode.CorrectLevel.L });</script> </div> </div> </div></div> </div> </div> </div></div>{% endblock %}完整源碼地址：

https://github.com/tinysheepyang/python_api。

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