feat: 添加wbi加签的Kotlin实现, 优化Java实现 (#1068)

docs/misc/sign/wbi.md

@@ -120,7 +120,7 @@
 
 ## Demo
 
-含 [Python](#Python)、[JavaScript](#JavaScript)、[Golang](#Golang)、[C#](#CSharp)、[Java](#Java)、[Swift](#Swift)、[C++](#CPlusPlus)、[Rust](#Rust) 语言编写的 Demo 。
+含 [Python](#Python)、[JavaScript](#JavaScript)、[Golang](#Golang)、[C#](#CSharp)、[Java](#Java)、[Kotlin](#Kotlin)、[Swift](#Swift)、[C++](#CPlusPlus)、[Rust](#Rust) 语言编写的 Demo 。
 
 ### Python
 
@@ -658,14 +658,13 @@ bar=514&baz=1919810&foo=114&wts=1687541921&w_rid=26e82b1b9b3a11dbb1807a9228a40d3
 
 ### Java
 
-需要 `hutool` 依赖
-
 ```java
-package com.example.demo;
+import java.net.URLEncoder;
-
+import java.nio.charset.StandardCharsets;
-import cn.hutool.crypto.SecureUtil;
+import java.security.MessageDigest;
-
+import java.security.NoSuchAlgorithmException;
 import java.util.*;
+import java.util.stream.Collectors;
 
 public class WbiTest {
     private static final int[] mixinKeyEncTab = new int[]{
@@ -675,38 +674,53 @@ public class WbiTest {
             36, 20, 34, 44, 52
     };
 
+    private static final char[] hexDigits = "0123456789abcdef".toCharArray();
+
+    public static String md5(String input) {
+        try {
+            MessageDigest md = MessageDigest.getInstance("MD5");
+            byte[] messageDigest = md.digest(input.getBytes(StandardCharsets.UTF_8));
+            char[] result = new char[messageDigest.length * 2];
+            for (int i = 0; i < messageDigest.length; i++) {
+                result[i * 2] = hexDigits[(messageDigest[i] >> 4) & 0xF];
+                result[i * 2 + 1] = hexDigits[messageDigest[i] & 0xF];
+            }
+            return new String(result);
+        } catch (NoSuchAlgorithmException e) {
+            return null;
+        }
+    }
+
     public static String getMixinKey(String imgKey, String subKey) {
         String s = imgKey + subKey;
         StringBuilder key = new StringBuilder();
-        for (int i = 0; i < 32; i++) {
+        for (int i = 0; i < 32; i++)
             key.append(s.charAt(mixinKeyEncTab[i]));
-        }
         return key.toString();
     }
 
+    public static String encodeURIComponent(Object o) {
+        return URLEncoder.encode(o.toString(), StandardCharsets.UTF_8).replace("+", "%20");
+    }
+
     public static void main(String[] args) {
         String imgKey = "653657f524a547ac981ded72ea172057";
         String subKey = "6e4909c702f846728e64f6007736a338";
         String mixinKey = getMixinKey(imgKey, subKey);
-      System.out.println(mixinKey);
+        System.out.println(mixinKey); // 72136226c6a73669787ee4fd02a74c27
-      //72136226c6a73669787ee4fd02a74c27
+
-      //{
+        // 用TreeMap自动排序
-      //     foo: 'one one four',
+        TreeMap<String, Object> map = new TreeMap<>();
-      //     bar: '五一四',
-      //     baz: 1919810
-      //}
-      LinkedHashMap<String, Object> map = new LinkedHashMap<>();
         map.put("foo", "one one four");
         map.put("bar", "五一四");
         map.put("baz", 1919810);
         map.put("wts", System.currentTimeMillis() / 1000);
-      StringJoiner param = new StringJoiner("&");
+        String param = map.entrySet().stream()
-      //排序 + 拼接字符串
+                .map(it -> String.format("%s=%s", it.getKey(), encodeURIComponent(it.getValue())))
-      map.entrySet().stream()
+                .collect(Collectors.joining("&"));
-              .sorted(Map.Entry.comparingByKey())
-              .forEach(entry -> param.add(entry.getKey() + "=" + URLUtil.encode(entry.getValue().toString())));
         String s = param + mixinKey;
-      String wbiSign = SecureUtil.md5(s);
+
+        String wbiSign = md5(s);
         System.out.println(wbiSign);
         String finalParam = param + "&w_rid=" + wbiSign;
         System.out.println(finalParam);
@@ -714,6 +728,75 @@ public class WbiTest {
 }
 ```
 
+### Kotlin
+
+```kotlin
+import java.net.URLEncoder
+import java.nio.charset.StandardCharsets
+import java.security.MessageDigest
+
+private val hexDigits = "0123456789abcdef".toCharArray()
+
+fun ByteArray.toHexString() = buildString(this.size shl 1) {
+    this@toHexString.forEach { byte ->
+        append(hexDigits[byte.toInt() ushr 4 and 15])
+        append(hexDigits[byte.toInt() and 15])
+    }
+}
+
+fun String.toMD5(): String {
+    val md = MessageDigest.getInstance("MD5")
+    val digest = md.digest(this.toByteArray())
+    return digest.toHexString()
+}
+
+private val mixinKeyEncTab = intArrayOf(
+    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, 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, 57, 62, 11,
+    36, 20, 34, 44, 52
+)
+
+fun getMixinKey(imgKey: String, subKey: String): String {
+    val s = imgKey + subKey
+    return buildString {
+        repeat(32) {
+            append(s[mixinKeyEncTab[it]])
+        }
+    }
+}
+
+fun Any.encodeURIComponent() =
+    URLEncoder.encode(this.toString(), StandardCharsets.UTF_8).replace("+", "%20")
+
+fun encWbi(params: Map<String, Any>, imgKey: String, subKey: String): String {
+    val mixinKey = getMixinKey(imgKey, subKey)
+    val s = params.toSortedMap().let {
+        it["wts"] to System.currentTimeMillis() / 1000
+        it.entries.joinToString("&") { (k, v) ->
+            "${k.encodeURIComponent()}=${v.encodeURIComponent()}"
+        }
+    }
+    return "$s&w_rid=${(s + mixinKey).toMD5()}"
+}
+
+fun main() {
+    val imgKey = "653657f524a547ac981ded72ea172057"
+    val subKey = "6e4909c702f846728e64f6007736a338"
+    val mixinKey = getMixinKey(imgKey, subKey)
+    println(mixinKey) // 72136226c6a73669787ee4fd02a74c27
+
+    // 需要加签的参数
+    val param = mapOf(
+        "foo" to "one+one four",
+        "bar" to "五一四",
+        "baz" to 1919810,
+    )
+
+    println(encWbi(param, imgKey, subKey))
+}
+```
+
 ### PHP
 
 来自[SocialSisterYi/bilibili-API-collect#813](https://github.com/SocialSisterYi/bilibili-API-collect/issues/813)