210 lines
9.1 KiB
Swift
210 lines
9.1 KiB
Swift
//
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// MP_WebWork.swift
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// MusicPlayer
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//
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// Created by Mr.Zhou on 2024/4/30.
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//
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import Foundation
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import WebKit
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import Alamofire
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///WebView管理器，通过拉取base.js文件来获取解密函数，完成对请求权限的解密
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class MP_WebWork:NSObject {
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//单例工具
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static let shared = MP_WebWork()
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///加载web(调用之后记得销毁)
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private var webView:WKWebView?
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///油管首页
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private lazy var homePath = "https://music.youtube.com/"
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private var jsPath:String = "https://music.youtube.com/"
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///解码方法名
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private var codeFunctionName:String!
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///签名时间缀
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var signatureTimestamp:Int!
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private override init() {
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super.init()
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//实例化webView
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webView = .init(frame: .zero)
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webView?.navigationDelegate = self
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webView?.uiDelegate = self
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// webView?.customUserAgent = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36"
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}
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deinit {
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webView = nil
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}
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/// 访问youtube主页
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func pingYoutubeHome() {
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//实现一个请求
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let request = URLRequest(url: .init(string: homePath)!)
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//加载web
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webView?.load(request)
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}
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///获取base.js文件地址
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private func getBasePath(_ jsContent:String) {
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let pattern = "s/player/[0-9a-fA-F]{8}/player_ias.vflset/[a-zA-Z_]+/base\\.js"
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guard let regex = try? NSRegularExpression(pattern: pattern, options: .dotMatchesLineSeparators) else {
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print("Regular expression compilation failed")
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return
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}
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// 在整个字符串范围内搜索正则表达式匹配项
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let nsRange = NSRange(jsContent.startIndex..<jsContent.endIndex, in: jsContent)
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let matches = regex.matches(in: jsContent, options: [], range: nsRange)
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// 检查是否找到匹配项
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if let first = matches.first {
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// 从匹配结果中提取整个匹配的字符串
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if let swiftRange = Range(first.range, in: jsContent) {
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let matchedString = String(jsContent[swiftRange])
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//成功获得base.js地址，进行拼接更改
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self.jsPath = self.jsPath + matchedString
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print("Current base.JavaScript path:\(self.jsPath)")
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//开始获取首页内容
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MPPositive_BrowseLoadViewModel.shared.reloadBrowseLists()
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//切换地址
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if let baseUrl = URL(string: self.jsPath) {
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let request = URLRequest(url: baseUrl)
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webView?.load(request)
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}
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}
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}
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}
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/// 调用JSweb并解密相关内容
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/// - Parameter signatureString: 需要解密的权限字符串
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func excuteJavaScript(_ signatureString:String, completion:@escaping((String) -> Void)){
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//检索webView是否存在
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guard webView != nil, codeFunctionName != nil else {
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return
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}
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//当webView和解码方法名同时存在时
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let function = "_yt_player.SNa('\(signatureString)');"
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//调用解密方法
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webView?.evaluateJavaScript(function){result,error in
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if let error = error {
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print("Code Error:\(error)")
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}
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if let result = result as? String {
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//该方法返回结果是一个字符串
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completion(result)
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}
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}
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}
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///获取方法名的正则表达
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private func regexFunction(_ jsContent:String) -> String? {
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var result:String?
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//唯一性的方法字符串
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let pattern = "\\w+=function\\(a\\)\\{[^}]*?a=a\\.split\\(\\\"\\\"\\);"
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// 使用NSRegularExpression进行正则匹配
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guard let regex = try? NSRegularExpression(pattern: pattern, options: .dotMatchesLineSeparators) else {
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print("Regular expression compilation failed")
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return result
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}
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// 执行正则匹配
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let matches = regex.matches(in: jsContent, options: [], range: NSRange(location: 0, length: jsContent.utf16.count))
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// 遍历匹配项并打印函数名
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for match in matches {
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if let range = Range(match.range(at: 0), in: jsContent) {
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// 提取函数体字符串
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let functionbody = String(jsContent[range])
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//将函数体字符串进行截取（以=为基准）
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let results = functionbody.split(separator: "=").map(String.init)
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//第一个元素就是方法名
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result = results[0]
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}
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}
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return result
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}
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///获取签名时间值
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private func getSignatureTimestamp(_ jsContent:String) -> Int?{
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let regexPattern = "signatureTimestamp:(\\d+)"
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guard let regex = try? NSRegularExpression(pattern: regexPattern, options: .dotMatchesLineSeparators) else {
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print("Regular expression compilation failed")
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return nil
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}
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let range = NSRange(jsContent.startIndex..<jsContent.endIndex, in: jsContent)
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let matches = regex.matches(in: jsContent, options: [], range: range)
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if let first = matches.first {
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if let matchRange = Range(first.range(at: 1), in: jsContent) {
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let matchedNumber = String(jsContent[matchRange])
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print(matchedNumber)
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return Int(matchedNumber)
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}
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return nil
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}
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return nil
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}
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}
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//MARK: - navigationDelegate
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extension MP_WebWork: WKNavigationDelegate, WKUIDelegate {
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func webView(_ webView: WKWebView, decidePolicyFor navigationResponse: WKNavigationResponse, decisionHandler: @escaping (WKNavigationResponsePolicy) -> Void){
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guard let url = navigationResponse.response.url, url.lastPathComponent == "base.js", codeFunctionName == nil else {
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decisionHandler(.allow) // 允许非JavaScript文件的加载
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return
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}
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//调用的是base.js文件，拦截该请求
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decisionHandler(.cancel)
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// 使用URLSession重新请求base.js文件
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let task = URLSession.shared.dataTask(with: url){ [weak self] data, response, error in
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guard let self = self, let data = data, error == nil else {
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print("Request base.JavaScript error: \(error?.localizedDescription ?? "")")
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decisionHandler(.allow)
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return
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}
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// 修改JavaScript文件内容
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guard let jsContent = String(data: data, encoding: .utf8) else {
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decisionHandler(.allow)
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return
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}
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guard let function = regexFunction(jsContent), let timeValue = getSignatureTimestamp(jsContent) else {
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decisionHandler(.allow)
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return
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}
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//获取需要的方法名,和签名时间缀
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signatureTimestamp = timeValue
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codeFunctionName = function
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//由于该解密函数方法是私有的，因此创建一句暴露代码
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let code = "g.SNa=\(codeFunctionName!);"
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let pattern = "\(codeFunctionName!)=function\\(a\\)\\{[^\\}]*\\};"
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let regex = try? NSRegularExpression(pattern: pattern, options: .dotMatchesLineSeparators)
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let nsRange = NSRange(jsContent.startIndex..<jsContent.endIndex, in: jsContent)
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let matches = regex?.matches(in: jsContent, options: [], range: nsRange)
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if let match = matches?.first {
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let replacementString = "\(jsContent[Range(match.range, in: jsContent)!])\n\(code)"
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let newJavaScript = jsContent.replacingOccurrences(of: jsContent[Range(match.range, in: jsContent)!], with: replacementString)
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DispatchQueue.main.async {
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// 在这里处理新的JavaScript代码，例如注入到webView
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webView.evaluateJavaScript(newJavaScript) { result,error in
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if let error = error {
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print("注入代码失败:\(error)")
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}else {
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print("注入代码完成")
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//发布切换启动页
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NotificationCenter.notificationKey.post(notificationName: .js_edit_completion)
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}
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}
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}
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}
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}
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task.resume()
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}
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// WKNavigationDelegate 方法，用于监听加载完成事件
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func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
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//未加载，查找解码方法
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webView.evaluateJavaScript("document.documentElement.outerHTML", completionHandler: { [weak self] (result, error) in
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//成功抓取了js内容
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if let content = result as? String {
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if self?.jsPath != "https://music.youtube.com/" {
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//当前base.js文件获取成功，获取解密方法名
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}else {
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//获取base.js地址
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self?.getBasePath(content)
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}
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} else if let error = error {
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print("Error getting JavaScript content: \(error.localizedDescription)")
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}
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})
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}
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}
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