给Wbi签名算法的Demo添加C#实现 (#719)

Co-authored-by: 社会易姐QwQ <45892418+SocialSisterYi@users.noreply.github.com>

docs/misc/sign/wbi.md

@@ -115,7 +115,7 @@
 
 ## Wbi签名算法实现Demo
 
-该 Demo 提供 [Python](#Python)、[JavaScript](#JavaScript)、[Golang](#Golang) 语言
+该 Demo 提供 [Python](#Python)、[JavaScript](#JavaScript)、[Golang](#Golang)、[C#](#CSharp) 语言
 
 ### Python
 
@@ -422,60 +422,100 @@ func main() {
 	fmt.Println(string(body))
 }
 ```
-### Java
 
-需要 `hutool` 依赖
+### CSharp
 
-```java
+无需依赖外部库
-package com.example.demo;
 
-import cn.hutool.crypto.SecureUtil;
+```cs
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.Json.Nodes;
 
-import java.util.*;
+class Program
+{
+    private static HttpClient _httpClient = new();
 
-public class WbiTest {
+    private static readonly int[] MixinKeyEncTab =
-    private static final int[] mixinKeyEncTab = new int[]{
+    {
-            46, 47, 18, 2, 53, 8, 23, 32, 15, 50, 10, 31, 58, 3, 45, 35, 27, 43, 5, 49,
+        46, 47, 18, 2, 53, 8, 23, 32, 15, 50, 10, 31, 58, 3, 45, 35, 27, 43, 5, 49, 33, 9, 42, 19, 29, 28, 14, 39,
-            33, 9, 42, 19, 29, 28, 14, 39, 12, 38, 41, 13, 37, 48, 7, 16, 24, 55, 40,
+        12, 38, 41, 13, 37, 48, 7, 16, 24, 55, 40, 61, 26, 17, 0, 1, 60, 51, 30, 4, 22, 25, 54, 21, 56, 59, 6, 63,
-            61, 26, 17, 0, 1, 60, 51, 30, 4, 22, 25, 54, 21, 56, 59, 6, 63, 57, 62, 11,
+        57, 62, 11, 36, 20, 34, 44, 52
-            36, 20, 34, 44, 52
     };
 
-    public static String getMixinKey(String imgKey, String subKey) {
+    //对 imgKey 和 subKey 进行字符顺序打乱编码
-        String s = imgKey + subKey;
+    private static string GetMixinKey(string orig)
-        StringBuilder key = new StringBuilder();
+    {
-        for (int i = 0; i < 32; i++) {
+        return MixinKeyEncTab.Aggregate("", (s, i) => s + orig[i])[..32];
-            key.append(s.charAt(mixinKeyEncTab[i]));
-        }
-        return key.toString();
     }
 
-    public static void main(String[] args) {
+    private static Dictionary<string, string> EncWbi(Dictionary<string, string> parameters, string imgKey,
-        String imgKey = "653657f524a547ac981ded72ea172057";
+        string subKey)
-        String subKey = "6e4909c702f846728e64f6007736a338";
+    {
-        String mixinKey = getMixinKey(imgKey, subKey);
+        string mixinKey = GetMixinKey(imgKey + subKey);
-        System.out.println(mixinKey);
+        string currTime = DateTimeOffset.Now.ToUnixTimeSeconds().ToString();
-        //72136226c6a73669787ee4fd02a74c27
+        //添加 wts 字段
-        //{
+        parameters["wts"] = currTime;
-        //     foo: '114',
+        // 按照 key 重排参数
-        //     bar: '514',
+        parameters = parameters.OrderBy(p => p.Key).ToDictionary(p => p.Key, p => p.Value);
-        //     zab: 1919810
+        //过滤 value 中的 "!'()*" 字符
-        //}
+        parameters = parameters.ToDictionary(
-        LinkedHashMap<String, Object> map = new LinkedHashMap<>();
+            kvp => kvp.Key,
-        map.put("foo", "114");
+            kvp => new string(kvp.Value.Where(chr => !"!'()*".Contains(chr)).ToArray())
-        map.put("bar", "514");
+        );
-        map.put("zab", 1919810);
+        // 序列化参数
-        map.put("wts", System.currentTimeMillis() / 1000);
+        string query = new FormUrlEncodedContent(parameters).ReadAsStringAsync().Result;
-        StringJoiner param = new StringJoiner("&");
+        //计算 w_rid
-        //排序 + 拼接字符串
+        using MD5 md5 = MD5.Create();
-        map.entrySet().stream()
+        byte[] hashBytes = md5.ComputeHash(Encoding.UTF8.GetBytes(query + mixinKey));
-                .sorted(Map.Entry.comparingByKey())
+        string wbiSign = BitConverter.ToString(hashBytes).Replace("-", "").ToLower();
-                .forEach(entry -> param.add(entry.getKey() + "=" + entry.getValue().toString()));
+        parameters["w_rid"] = wbiSign;
-        String s = param + mixinKey;
+
-        String wbiSign = SecureUtil.md5(s);
+        return parameters;
-        System.out.println(wbiSign);
+    }
-        String finalParam = param + "&w_rid=" + wbiSign;
+
-        System.out.println(finalParam);
+    // 获取最新的 img_key 和 sub_key
+    private static async Task<(string, string)> GetWbiKeys()
+    {
+        HttpResponseMessage responseMessage = await _httpClient.SendAsync(new HttpRequestMessage
+        {
+            Method = HttpMethod.Get,
+            RequestUri = new Uri("https://api.bilibili.com/x/web-interface/nav"),
+        });
+
+        JsonNode response = JsonNode.Parse(await responseMessage.Content.ReadAsStringAsync())!;
+
+        string imgUrl = (string)response["data"]!["wbi_img"]!["img_url"]!;
+        imgUrl = imgUrl.Split("/")[^1].Split(".")[0];
+
+        string subUrl = (string)response["data"]!["wbi_img"]!["sub_url"]!;
+        subUrl = subUrl.Split("/")[^1].Split(".")[0];
+        return (imgUrl, subUrl);
+    }
+
+    public static async Task Main()
+    {
+        var (imgKey, subKey) = await GetWbiKeys();
+
+        Dictionary<string, string> signedParams = EncWbi(
+            parameters: new Dictionary<string, string>
+            {
+                { "foo", "114" },
+                { "bar", "514" },
+                { "baz", "1919810" }
+            },
+            imgKey: imgKey,
+            subKey: subKey
+        );
+
+        string query = await new FormUrlEncodedContent(signedParams).ReadAsStringAsync();
+
+        Console.WriteLine(query);
     }
 }
+```
+输出内容为进行 Wbi 签名的后参数的 url query 形式
+
+```
+bar=514&baz=1919810&foo=114&wts=1687541921&w_rid=26e82b1b9b3a11dbb1807a9228a40d3b
 ```