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https://github.com/develop202/migu_video.git
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回放,h5失效
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191
utils/ddCalcuURL.js
Normal file
191
utils/ddCalcuURL.js
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@@ -0,0 +1,191 @@
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const list = {
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// h5端修改频繁,现已失效
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"h5": {
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// 第11位字符
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"keys": "yzwxcdabgh",
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// 第5 8 14位字母对应下标0 1 3的字符
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"words": ['z', 'y', '0', 'w'],
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// 第11位字符替换位置,从0开始
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"thirdReplaceIndex": 1,
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// 加密后链接后缀
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"suffix": "&sv=10000&ct=www"
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},
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"android": {
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"keys": "cdabyzwxkl",
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"words": ['x', 'a', '0', 'a'],
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"thirdReplaceIndex": 6,
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"suffix": "&sv=10004&ct=android"
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}
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}
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const importObj = {
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a: {
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a: (a, b, c) => { },
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b: (a) => { return 0 },
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c: () => { },
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d: (a, b, c, d) => { return 0 },
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e: (a) => { return 0 },
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f: (a, b, c, d, e) => { return 0 },
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g: (a, b) => { return 0 },
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h: (a, b) => { return 0 },
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i: (a) => { return 0 },
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j: (a, b, c, d, e) => { return 0 }
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}
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}
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/**
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* 加密url
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* @param {string} videoURL - 视频url
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* @param {Uint8Array} memoryView - 内存
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* @param {Function} getEncrypt - 加密方法
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* @returns {string} - 加密地址
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*/
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function encrypt(videoURL, memoryView, getEncrypt) {
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// 将地址写入内存
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let i;
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for (i = 0; i < videoURL.length; ++i) {
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memoryView[i] = videoURL.charCodeAt(i)
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}
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memoryView[i] = 0
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// 加密内存中的url
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let start = getEncrypt(0)
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// 从内存中读取加密后的url
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let encryptedURL = ""
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for (let i = start; memoryView[i] != 0; ++i) {
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encryptedURL += String.fromCharCode(memoryView[i])
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}
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return encryptedURL
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}
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/**
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* 初始化wasm
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* @param {string} masmURL - wasm地址
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* @returns {object} - wasm导出的内容
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*/
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async function initWasm(masmURL) {
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// 获取wasm文件
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let resp = await fetch(masmURL);
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// 初始化
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let { instance } = await WebAssembly.instantiateStreaming(resp, importObj)
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return instance.exports;
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}
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/**
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* 获取加密url
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* @param {object} exports - wasm导出的内容
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* @param {string} videoURL - 视频地址
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* @returns {string} - 播放地址
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*/
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function getEncryptURL(exports, videoURL) {
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// 获得内存
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const memory = exports.k
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const memoryView = new Uint8Array(memory.buffer)
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// 获取加密方法
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const getEncrypt = exports.m
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return encrypt(videoURL, memoryView, getEncrypt)
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}
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/**
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* h5端现已失效
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* 获取ddCalcu
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* 大致思路:把puData最后一个字符和第一个字符拼接,然后拼接倒数第二个跟第二个,一直循环,当第1 2 3 4次(从0开始)循环时需要插入特殊标识字符
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* 特殊字符:四个特殊字符位置是第5 8 11 14,第5 8 14是根据平台确定的,且各个节目都一样。第11位在h5上是根据节目ID第1位(从0开始,android是第6位)数字为下标的某字符串的值
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* 在android,标清画质还有区分,第5位字符需要修改,其他不变
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* @param {string} puData - 服务器返回的那个东东
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* @param {string} programId - 节目ID
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* @param {string} clientType - 平台类型 h5 android
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* @param {string} rateType - 清晰度 2:标清 3:高清 4:蓝光
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* @returns {string} - ddCalcu
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*/
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function getddCalcu(puData, programId, clientType, rateType) {
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if (puData == null || puData == undefined) {
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return ""
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}
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if (programId == null || programId == undefined) {
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return ""
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}
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if (clientType != "android" && clientType != "h5") {
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return ""
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}
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if (rateType == null || rateType == undefined) {
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return ""
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}
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let keys = list[clientType].keys
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let words = list[clientType].words
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const thirdReplaceIndex = list[clientType].thirdReplaceIndex
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// android平台标清
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if (clientType == "android" && rateType == "2") {
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words[0] = "v"
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}
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puData = puData.split("");
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keys = keys.split("")
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const puDataLength = puData.length
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programId = programId.split("")
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let ddCalcu = []
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for (let i = 0; i < puDataLength / 2; i++) {
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ddCalcu.push(puData[puDataLength - i - 1])
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ddCalcu.push(puData[i])
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switch (i) {
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case 1:
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ddCalcu.push(words[i - 1])
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break;
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case 2:
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ddCalcu.push(words[i - 1])
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break;
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case 3:
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ddCalcu.push(keys[programId[thirdReplaceIndex]])
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break;
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case 4:
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ddCalcu.push(words[i - 1])
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break;
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}
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}
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return ddCalcu.join("")
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}
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/**
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* 加密链接
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* @param {string} puDataURL - 加密前链接
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* @param {string} programId - 节目ID
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* @param {string} clientType - 客户端类型 h5 android
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* @param {string} rateType - 清晰度 2:标清 3:高清 4:蓝光
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* @returns {string} - 加密链接
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*/
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function getddCalcuURL(puDataURL, programId, clientType, rateType) {
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if (puDataURL == null || puDataURL == undefined) {
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return ""
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}
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if (programId == null || programId == undefined) {
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return ""
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}
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if (clientType != "android" && clientType != "h5") {
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return ""
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}
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if (rateType == null || rateType == undefined) {
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return ""
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}
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const puData = puDataURL.split("&puData=")[1]
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const ddCalcu = getddCalcu(puData, programId, clientType, rateType)
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const suffix = list[clientType].suffix
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return `${puDataURL}&ddCalcu=${ddCalcu}${suffix}`
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}
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export { initWasm, getEncryptURL, getddCalcuURL }
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