random user-agent

BBDown.Core/Util/BilibiliBvConverter.cs

@@ -7,7 +7,7 @@
 namespace BBDown.Core.Util
 {
     //code from: https://www.zhihu.com/question/381784377/answer/1099438784
-    internal class BilibiliBvConverter
+    public class BilibiliBvConverter
     {
         private static string table = "fZodR9XQDSUm21yCkr6zBqiveYah8bt4xsWpHnJE7jL5VG3guMTKNPAwcF";
         private static Dictionary<char, long> tr = new Dictionary<char, long>();
@@ -41,7 +41,7 @@ public static string Encode(long x)
             return new string(r);
         }
 
-        private static int[] s = { 11, 10, 3, 8, 4, 6 };
+        private static byte[] s = { 9, 8, 1, 6, 2, 4 };
         private static long xor = 177451812;
         private static long add = 8728348608;
     }

BBDown.Core/Util/HTTPUtil.cs

@@ -1,11 +1,13 @@
-using System.Net;
+using System;
+using System.Net;
 using System.Net.Http.Headers;
 using static BBDown.Core.Logger;
 
 namespace BBDown.Core.Util
 {
     public class HTTPUtil
     {
+
         public static readonly HttpClient AppHttpClient = new(new HttpClientHandler
         {
             AllowAutoRedirect = true,
@@ -16,18 +18,35 @@ public class HTTPUtil
             Timeout = TimeSpan.FromMinutes(2)
         };
 
+        private static readonly Random random = new Random();
+        private static readonly string[] platforms = { "Windows NT 10.0; Win64", "Macintosh; Intel Mac OS X 10_15", "X11; Linux x86_64" };
+
+        private static string RandomVersion(int min, int max)
+        {
+            double version = random.NextDouble() * (max - min) + min;
+            return version.ToString("F3");
+        }
+
+        public static string GetRandomUserAgent()
+        {
+            string[] browsers = { $"AppleWebKit/537.36 (KHTML, like Gecko) Chrome/{RandomVersion(80, 110)} Safari/537.36", $"Gecko/20100101 Firefox/{RandomVersion(80, 110)}" };
+            return $"Mozilla/5.0 ({platforms[random.Next(platforms.Length)]}) {browsers[random.Next(browsers.Length)]}";
+        }
+
+        public static string UserAgent { get; set; } = GetRandomUserAgent();
+
         public static async Task<string> GetWebSourceAsync(string url)
         {
             using var webRequest = new HttpRequestMessage(HttpMethod.Get, url);
-            webRequest.Headers.TryAddWithoutValidation("User-Agent", "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0 Safari/605.1.15");
+            webRequest.Headers.TryAddWithoutValidation("User-Agent", UserAgent);
             webRequest.Headers.TryAddWithoutValidation("Accept-Encoding", "gzip, deflate");
             webRequest.Headers.TryAddWithoutValidation("Cookie", (url.Contains("/ep") || url.Contains("/ss")) ? Config.COOKIE + ";CURRENT_FNVAL=4048;" : Config.COOKIE);
-            if (url.Contains("api.bilibili.com/pgc/player/web/playurl") || url.Contains("api.bilibili.com/pugv/player/web/playurl"))
-                webRequest.Headers.TryAddWithoutValidation("Referer", "https://www.bilibili.com");
+            if (url.Contains("api.bilibili.com"))
+                webRequest.Headers.TryAddWithoutValidation("Referer", "https://www.bilibili.com/");
             webRequest.Headers.CacheControl = CacheControlHeaderValue.Parse("no-cache");
             webRequest.Headers.Connection.Clear();
 
-            LogDebug("获取网页内容：Url: {0}, Headers: {1}", url, webRequest.Headers);
+            LogDebug("获取网页内容: Url: {0}, Headers: {1}", url, webRequest.Headers);
             var webResponse = (await AppHttpClient.SendAsync(webRequest, HttpCompletionOption.ResponseHeadersRead)).EnsureSuccessStatusCode();
 
             string htmlCode = await webResponse.Content.ReadAsStringAsync();

BBDown/BBDownUtil.cs

@@ -221,19 +221,7 @@ public static async Task<string> GetAidByBVAsync(string bv)
             if (bv.Length == 10)
             {
                 // 能在本地就在本地
-                string TABLE = "fZodR9XQDSUm21yCkr6zBqiveYah8bt4xsWpHnJE7jL5VG3guMTKNPAwcF";
-                var BVChange = new Dictionary<char, byte>();
-                byte[] S = { 9, 8, 1, 6, 2, 4 };
-                long XOR = 177451812;
-                long ADD = 8728348608;
-                for (byte i = 0; i < 58; i++) BVChange.Add(TABLE[i], i);
-
-                long T = 0;
-                for (byte i = 0; i < 6; i++)
-                {
-                    T += (long)Math.Pow(58, i) * BVChange[bv[S[i]]];
-                }
-                return ((T - ADD) ^ XOR).ToString();
+                return Core.Util.BilibiliBvConverter.Decode(bv).ToString();
             }
             else
             {

BBDown/CommandLineInvoker.cs

@@ -42,6 +42,7 @@ internal class CommandLineInvoker
         private readonly static Option<bool> AudioAscending = new(new string[] { "--audio-ascending" }, "音频升序(最小体积优先)");
         private readonly static Option<bool> AllowPcdn = new(new string[] { "--allow-pcdn" }, "不替换PCDN域名, 仅在正常情况与--upos-host均无法下载时使用");
         private readonly static Option<string> Language = new(new string[] { "--language" }, "设置混流的音频语言(代码), 如chi, jpn等");
+        private readonly static Option<string> UserAgent = new(new string[] { "--user-agent", "-ua" }, "指定user-agent, 否则使用随机user-agent");
         private readonly static Option<string> Cookie = new(new string[] { "--cookie", "-c" }, "设置字符串cookie用以下载网页接口的会员内容");
         private readonly static Option<string> AccessToken = new(new string[] { "--access-token", "-token" }, "设置access_token用以下载TV/APP接口的会员内容");
         private readonly static Option<string> WorkDir = new(new string[] { "--work-dir" }, "设置程序的工作目录");
@@ -106,6 +107,7 @@ protected override MyOption GetBoundValue(BindingContext bindingContext)
                 if (bindingContext.ParseResult.HasOption(MultiFilePattern)) option.MultiFilePattern = bindingContext.ParseResult.GetValueForOption(MultiFilePattern)!;
                 if (bindingContext.ParseResult.HasOption(SelectPage)) option.SelectPage = bindingContext.ParseResult.GetValueForOption(SelectPage)!;
                 if (bindingContext.ParseResult.HasOption(Language)) option.Language = bindingContext.ParseResult.GetValueForOption(Language)!;
+                if (bindingContext.ParseResult.HasOption(UserAgent)) option.UserAgent = bindingContext.ParseResult.GetValueForOption(UserAgent)!;
                 if (bindingContext.ParseResult.HasOption(Cookie)) option.Cookie = bindingContext.ParseResult.GetValueForOption(Cookie)!;
                 if (bindingContext.ParseResult.HasOption(AccessToken)) option.AccessToken = bindingContext.ParseResult.GetValueForOption(AccessToken)!;
                 if (bindingContext.ParseResult.HasOption(Aria2cArgs)) option.Aria2cArgs = bindingContext.ParseResult.GetValueForOption(Aria2cArgs)!;
@@ -167,6 +169,7 @@ public static RootCommand GetRootCommand(Func<MyOption, Task> action)
                 MultiFilePattern,
                 SelectPage,
                 Language,
+                UserAgent,
                 Cookie,
                 AccessToken,
                 Aria2cArgs,

BBDown/MyOption.cs

@@ -41,6 +41,7 @@ internal class MyOption
         public string MultiFilePattern { get; set; } = "";
         public string SelectPage { get; set; } = "";
         public string Language { get; set; } = "";
+        public string UserAgent { get; set; } = "";
         public string Cookie { get; set; } = "";
         public string AccessToken { get; set; } = "";
         public string Aria2cArgs { get; set; } = "";

BBDown/Program.cs

@@ -251,6 +251,7 @@ private static async Task DoWorkAsync(MyOption myOption)
                 Config.HOST = myOption.Host;
                 Config.EPHOST = myOption.EpHost;
                 Config.AREA = myOption.Area;
+                HTTPUtil.UserAgent = myOption.UserAgent == "" ? HTTPUtil.GetRandomUserAgent() : myOption.UserAgent;
                 Config.COOKIE = myOption.Cookie;
                 Config.TOKEN = myOption.AccessToken.Replace("access_token=", "");