feat(metrics): 运行指标服务端支持设置 HTTP 认证.

支持对运行指标服务端设置 HTTP 认证, 以防止运行指标被非法获取.

scalabot-app/src/main/kotlin/AppConfigs.kt

@@ -5,10 +5,7 @@ import com.google.gson.Gson
 import com.google.gson.GsonBuilder
 import com.google.gson.reflect.TypeToken
 import mu.KotlinLogging
-import net.lamgc.scalabot.util.ArtifactSerializer
-import net.lamgc.scalabot.util.AuthenticationSerializer
-import net.lamgc.scalabot.util.MavenRepositoryConfigSerializer
-import net.lamgc.scalabot.util.ProxyTypeSerializer
+import net.lamgc.scalabot.util.*
 import org.eclipse.aether.artifact.Artifact
 import org.eclipse.aether.repository.Authentication
 import org.eclipse.aether.repository.Proxy
@@ -92,7 +89,8 @@ internal data class ProxyConfig(
 internal data class MetricsConfig(
     val enable: Boolean = false,
     val port: Int = 9386,
-    val bindAddress: String? = "0.0.0.0"
+    val bindAddress: String? = "0.0.0.0",
+    val authenticator: UsernameAuthenticator? = null
 )
 
 /**
@@ -322,6 +320,7 @@ private object GsonConst {
         .registerTypeAdapter(DefaultBotOptions.ProxyType::class.java, ProxyTypeSerializer)
         .registerTypeAdapter(MavenRepositoryConfig::class.java, MavenRepositoryConfigSerializer)
         .registerTypeAdapter(Authentication::class.java, AuthenticationSerializer)
+        .registerTypeAdapter(UsernameAuthenticator::class.java, UsernameAuthenticatorSerializer)
         .create()
 
     val botConfigGson: Gson = baseGson.newBuilder()

scalabot-app/src/main/kotlin/AppMain.kt

@@ -39,14 +39,15 @@ fun main(args: Array<String>): Unit = runBlocking {
  * 启动运行指标服务器.
  * 使用 Prometheus 指标格式.
  */
-internal fun startMetricsServer(config: MetricsConfig = Const.config.metrics) {
+internal fun startMetricsServer(config: MetricsConfig = Const.config.metrics): HTTPServer? {
     if (!config.enable) {
         log.debug { "运行指标服务器已禁用." }
-        return
+        return null
     }
 
     val builder = HTTPServer.Builder()
         .withDaemonThreads(true)
+        .withAuthenticator(config.authenticator)
         .withPort(config.port)
         .withHostname(config.bindAddress)
 
@@ -54,6 +55,7 @@ internal fun startMetricsServer(config: MetricsConfig = Const.config.metrics) {
         .build()
         .registerShutdownHook()
     log.info { "运行指标服务器已启动. (Port: ${httpServer.port})" }
+    return httpServer
 }
 
 internal class Launcher(private val config: AppConfig = Const.config) : AutoCloseable {

scalabot-app/src/main/kotlin/util/UsernameAuthenticator.kt

@@ -0,0 +1,65 @@
+package net.lamgc.scalabot.util
+
+import com.google.gson.*
+import com.sun.net.httpserver.BasicAuthenticator
+import java.lang.reflect.Type
+
+class UsernameAuthenticator(private val username: String, private val password: String) :
+    BasicAuthenticator("metrics") {
+    override fun checkCredentials(username: String?, password: String?): Boolean =
+        this.username == username && this.password == password
+
+    fun toJsonObject(): JsonObject = JsonObject().apply {
+        addProperty("username", username)
+        addProperty("password", password)
+    }
+
+    override fun equals(other: Any?): Boolean {
+        return other is UsernameAuthenticator && this.username == other.username && this.password == other.password
+    }
+
+    override fun hashCode(): Int {
+        var result = username.hashCode()
+        result = 31 * result + password.hashCode()
+        return result
+    }
+
+}
+
+object UsernameAuthenticatorSerializer : JsonSerializer<UsernameAuthenticator>,
+    JsonDeserializer<UsernameAuthenticator> {
+
+    override fun serialize(
+        src: UsernameAuthenticator,
+        typeOfSrc: Type?,
+        context: JsonSerializationContext?
+    ): JsonElement {
+        return src.toJsonObject()
+    }
+
+    override fun deserialize(
+        json: JsonElement,
+        typeOfT: Type?,
+        context: JsonDeserializationContext?
+    ): UsernameAuthenticator? {
+        if (json.isJsonNull) {
+            return null
+        } else if (!json.isJsonObject) {
+            throw JsonParseException("Invalid attribute value type.")
+        }
+
+        val jsonObj = json.asJsonObject
+
+        if (jsonObj["username"]?.isJsonPrimitive != true) {
+            throw JsonParseException("Invalid attribute value: username")
+        } else if (jsonObj["password"]?.isJsonPrimitive != true) {
+            throw JsonParseException("Invalid attribute value: password")
+        }
+
+        if (jsonObj["username"].asString.isEmpty() || jsonObj["password"].asString.isEmpty()) {
+            throw JsonParseException("`username` or `password` is empty.")
+        }
+        return UsernameAuthenticator(jsonObj["username"].asString, jsonObj["password"].asString)
+    }
+
+}