refactor(util): 重构 MFAUtil 并优化相关服务

- 移除了 DownloadUtil 中的注释代码
- 修改了 MFAGenerateService 中的 MFA 验证码生成逻辑
- 重构了 MFAUtil 类，增加了默认步长的 generate 方法
- 更新了 JsonUtil，添加了对象与 JSON 字符串互转的扩展函数
- 在 pom.xml 中添加了 hutool-http 依赖

pom.xml

@@ -163,6 +163,11 @@
 			<artifactId>core</artifactId>
 			<version>3.3.3</version>
 		</dependency>
+		<dependency>
+			<groupId>cn.hutool</groupId>
+			<artifactId>hutool-http</artifactId>
+			<version>5.8.31</version>
+		</dependency>
 	</dependencies>
 
 	<build>

src/main/kotlin/info/alinadace/sakuramiki/service/jm/util/DownloadUtil.kt

@@ -47,12 +47,6 @@ class DownloadUtil {
             return this.newCall(Request.Builder()
                 .url(url)
                 .method(method, body)
-////                .addHeader("Content-Type", "application/json")
-////                .addHeader("Authorization", "Bearer $APIKEY")
-//                .addHeader("User-Agent", "Apifox/1.0.0 (https://apifox.com)")
-//                .addHeader("Accept", "*/*")
-//                .addHeader("Host", "api.github.com")
-//                .addHeader("Connection", "keep-alive")
                 .build()).execute()
         }
     }

src/main/kotlin/info/alinadace/sakuramiki/service/mfa/MFAGenerateService.kt

@@ -57,7 +57,7 @@ class MFAGenerateService : Service<FriendMessageEvent> {
                     event.send("您还没有绑定默认MFA，使用 #mfa bind default <secret> 绑定默认MFA")
                     return
                 }
-                event.send(MFAUtil.generate(mfa.secret, 30))
+                event.send(MFAUtil.generate(mfa.secret))
                 return
             }
             if (command.size == 2){
@@ -70,7 +70,7 @@ class MFAGenerateService : Service<FriendMessageEvent> {
                     event.send("您还没有绑定${command[1]} MFA，使用 #mfa bind ${command[1]} <secret> 绑定${command[1]} MFA")
                     return
                 }
-                event.send(MFAUtil.generate(mfa.secret, 30))
+                event.send(MFAUtil.generate(mfa.secret))
                 return
             }
         }

src/main/kotlin/info/alinadace/sakuramiki/util/JsonUtil.kt

@@ -7,7 +7,15 @@ import com.fasterxml.jackson.databind.ObjectMapper
  * @author Kane
  * @since 2025/3/24 16:10
  */
-private val OBJECT_MAPPER = ObjectMapper()
+val OBJECT_MAPPER = ObjectMapper()
 fun parse(json: String): Dict {
     return OBJECT_MAPPER.readValue(json, OBJECT_MAPPER.typeFactory.constructType(Dict::class.java))
 }
+
+inline fun <reified T : Any> T.toJson(): String {
+    return OBJECT_MAPPER.writeValueAsString(this)
+}
+
+inline fun <reified T : Any> T.ofJson(json: String): T{
+    return OBJECT_MAPPER.readValue(json, T::class.java)
+}

src/main/kotlin/info/alinadace/sakuramiki/util/MFAUtil.kt

@@ -11,41 +11,53 @@ import kotlin.math.pow
  * @since 2025/3/18 16:01
  */
 class MFAUtil {
-    companion object{
+    companion object {
         private const val ALGORITHM = "HmacSHA1"
         private val mac = Mac.getInstance(ALGORITHM)
+        private const val CODE_DIGITS = 6
+        private const val CODE_MODULUS = 10.0
+
         /**
          * 生成 MFA 验证码
          */
         fun generate(key: String, step: Int): String {
-            val data = ByteArray(8)
-            var value = System.currentTimeMillis() / 1000 / step
-            run {
-                var i = 8
-                while (i-- > 0) {
+            return try {
+                val data = ByteArray(8)
+                var value = System.currentTimeMillis() / 1000 / step
+
+                for (i in 7 downTo 0) {
                     data[i] = value.toByte()
                     value = value ushr 8
                 }
+
+                val decodedKey = Base32.decode(key)
+                val signKey = SecretKeySpec(decodedKey, ALGORITHM)
+                mac.init(signKey)
+                val hash = mac.doFinal(data)
+                val offset = hash[hash.size - 1].toInt() and 0xF
+
+                var truncatedHash: Long = 0
+
+                for (i in 0..3) {
+                    truncatedHash = truncatedHash shl 8
+                    truncatedHash = truncatedHash or (hash[offset + i].toInt() and 0xFF).toLong()
+                }
+
+                truncatedHash = truncatedHash and 0x7FFFFFFFL
+                truncatedHash %= CODE_MODULUS.pow(CODE_DIGITS).toLong()
+
+                "%0${CODE_DIGITS}d".format(truncatedHash)
+            } catch (e: Exception) {
+                throw RuntimeException("Failed to generate MFA code", e)
             }
-
-            val decodedKey = Base32.decode(key)
-            val signKey = SecretKeySpec(decodedKey, ALGORITHM)
-            mac.init(signKey)
-            val hash = mac.doFinal(data)
-            println(hash.contentToString())
-            val offset = hash[hash.size - 1].toInt() and 0xF
-
-            var truncatedHash: Long = 0
-
-            for (i in 0..3) {
-                truncatedHash = truncatedHash shl 8
-                truncatedHash = truncatedHash or (hash[offset + i].toInt() and 0xFF).toLong()
-            }
-
-            truncatedHash = truncatedHash and 0x7FFFFFFFL
-            truncatedHash %= 10.0.pow(6.0).toLong()
-
-            return String.format("%0" + 6 + "d", truncatedHash)
         }
+
+        /**
+         * 生成默认步长（30秒）的 MFA 验证码
+         *
+         * @param key Base32编码的密钥
+         * @return 6位数字验证码
+         */
+        fun generate(key: String): String = generate(key, 30)
     }
 }