aliplayer-min.js是阿里的web播放器SDK，封装了很多稀奇古怪的东西。
经过了浏览源码、精简源码、修改源码的过程，建议把aliplayer-min.js当作黑盒使用，略微修改其中的代码把想要的结果输出即可。
大致步骤
spider_ali.png
其他细节
1.寻找使用aliplayer-min.js的蛛丝马迹
通过阅读阿里web播放器SDK的文档，发现如果要使用该SDK，有一个固定的语法”var player = new Aliplayer({“，所以，燥起来，去找含有这个语法的js代码吧。如果没找到，说明藏得比较深，再找一次。
2.构建本地模拟页面
话不多说，直接上代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, height=device-height, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no"/>
<title>AliPlayer Tester</title>
<link rel="stylesheet" href="https://g.alicdn.com/de/prismplayer/2.8.2/skins/default/aliplayer-min.css" />
<script charset="utf-8" type="text/javascript" src="./aliplayer-min-ly.js"></script>
</head>
<body>
<div class="prism-player" id="J_prismPlayer"></div>
<div id="get-video"></div>
<script>
var player = new Aliplayer({
id: "J_prismPlayer",
width: "100%",
height: "100%",
autoplay: true,
vid: "fc-videoid",
playauth: "fc-playauth",
cover: "fc-cover",
qualitySort: "desc",
region:'cn-shanghai',
});
</script>
</body>
</html>
注意:aliplayer-min-ly.js是我修改后的版本，目的是把对应接口URL暴露出来。具体修改部分如下：
var r = u.makeUTF8sort(i, "=", "&") + "&Signature=" + u.AliyunEncodeURI(u.makeChangeSiga(i, e.accessSecret)),
n = "https://vod." + e.domainRegion + ".aliyuncs.com/?" + r;
console.log("88:" + n); // 修改部分，增加console打印
document.getElementById("get-video").innerHTML=n; // 修改部分，结果体现到页面，方面后面抓取
// l.get(n, function (e) {
// if (e) {
// var t = JSON.parse(e),
// ... 省略
3.Python + Selenium + PhantomJS请求接口
不断替换构建的本地页面中的参数，用Selenium + PhantomJS调用修改的aliplayer-min-ly.js获取想要的接口URL，通过该接口URL最终获得视频的地址。
相关代码如下：
# 模拟构建请求页面
with open("/Users/song/Desktop/aliplayer-fc.html", "r") as f:
fc_page = f.read()
with open("/Users/song/Desktop/aliplayer-fc-fc.html", "w") as f:
f.write(fc_page.replace("fc-videoid", courseModuleRecordVideoId).replace("fc-playauth", play_playAuth).replace("fc-cover", play_cover))
browser.get('file:///Users/song/Desktop/aliplayer-fc-fc.html')
get_video_url = browser.find_element_by_id("get-video").text
video_info_response = opener.open(get_video_url)
video_info_json = json.loads(video_info_response.read(), encoding="UTF-8")
mp4_video_url = video_info_json['PlayInfoList']['PlayInfo'][1]['PlayURL']
mp4_video_duration = video_info_json['PlayInfoList']['PlayInfo'][1]['Duration']
os.makedirs(base_name + "/" + courseModuleRecordName, exist_ok=True)
full_video_name = base_name + "/" + courseModuleRecordName + "/" + courseModuleRecordDetailName
print(full_video_name, mp4_video_url, mp4_video_duration)
video_downloader(mp4_video_url, full_video_name)
下载视频方法：
# 下载视频函数
def video_downloader(video_url, video_name):
print("开始下载【" + video_name + "】，URL：" + video_url)
video_streams = requests.get(video_url, stream=True)
video_format = re.sub("\?.*", "", re.sub(".*\.", "", video_url))
v_name = video_name + "." + video_format
with open(v_name, "wb") as video:
for chunk in video_streams.iter_content(chunk_size=1024*1024):
if chunk:
video.write(chunk)
print("FINISHED!")
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