refactor(config): 将与配置相关的内容迁移到 scalabot-meta 模块.

通过将配置迁移到单独的模块, 可以方便使用其他程序扩展 ScaleBot, 而不仅仅是让 ScaleBot 成为扩展的平台.

BREAKING CHANGE: 与配置有关的 Class 移动到了 scalabot-meta 模块.

目前仅所有配置类(以 `Config` 结尾的 Class)和相应的序列化类(以 `Serializer` 结尾的)都迁移到了 meta 模块, 但其工具方法则作为扩展函数保留在 app 模块中.
这么做的好处是为了方便其他应用(例如 ScalaBot 外部管理程序)根据需要生成配置文件.
scalabot-meta 将会作为依赖项发布, 可根据需要获取 ScalaBot-meta 生成 ScalaBot 的配置.
此次改动普通用户无需迁移.

scalabot-meta/src/main/kotlin/serializer/Serializer.kt

@@ -0,0 +1,166 @@
+package net.lamgc.scalabot.config.serializer
+
+import com.google.gson.*
+import net.lamgc.scalabot.config.MavenRepositoryConfig
+import net.lamgc.scalabot.config.ProxyType
+import net.lamgc.scalabot.config.UsernameAuthenticator
+import org.eclipse.aether.artifact.Artifact
+import org.eclipse.aether.artifact.DefaultArtifact
+import org.eclipse.aether.repository.Authentication
+import org.eclipse.aether.repository.Proxy
+import org.eclipse.aether.util.repository.AuthenticationBuilder
+import java.lang.reflect.Type
+import java.net.URL
+
+object ProxyTypeSerializer : JsonDeserializer<ProxyType>,
+    JsonSerializer<ProxyType> {
+
+    override fun deserialize(
+        json: JsonElement,
+        typeOfT: Type?,
+        context: JsonDeserializationContext?
+    ): ProxyType {
+        if (json.isJsonNull) {
+            return ProxyType.NO_PROXY
+        }
+        if (!json.isJsonPrimitive) {
+            throw JsonParseException("Wrong configuration value type.")
+        }
+        val value = json.asString.trim()
+        try {
+            return ProxyType.valueOf(value.uppercase())
+        } catch (e: IllegalArgumentException) {
+            throw JsonParseException("Invalid value: $value")
+        }
+    }
+
+    override fun serialize(
+        src: ProxyType,
+        typeOfSrc: Type?,
+        context: JsonSerializationContext?
+    ): JsonElement {
+        return JsonPrimitive(src.toString())
+    }
+}
+
+object ArtifactSerializer : JsonSerializer<Artifact>, JsonDeserializer<Artifact> {
+    override fun serialize(src: Artifact, typeOfSrc: Type?, context: JsonSerializationContext?): JsonElement {
+        val gavBuilder = StringBuilder("${src.groupId}:${src.artifactId}")
+        if (!src.extension.equals("jar")) {
+            gavBuilder.append(':').append(src.extension)
+        }
+        if (src.classifier.isNotEmpty()) {
+            gavBuilder.append(':').append(src.classifier)
+        }
+        return JsonPrimitive(gavBuilder.append(':').append(src.version).toString())
+    }
+
+    override fun deserialize(json: JsonElement, typeOfT: Type?, context: JsonDeserializationContext?): Artifact {
+        if (!json.isJsonPrimitive) {
+            throw JsonParseException("Wrong configuration value type.")
+        }
+        return DefaultArtifact(json.asString.trim())
+    }
+
+}
+
+object AuthenticationSerializer : JsonDeserializer<Authentication> {
+
+    override fun deserialize(json: JsonElement, typeOfT: Type, context: JsonDeserializationContext): Authentication {
+        if (json !is JsonObject) {
+            throw JsonParseException("Unsupported JSON type.")
+        }
+        val username = SerializerUtils.checkJsonKey(json, "username")
+        val password = SerializerUtils.checkJsonKey(json, "password")
+        val builder = AuthenticationBuilder()
+        builder.addUsername(username)
+        builder.addPassword(password)
+        return builder.build()
+    }
+
+}
+
+private object SerializerUtils {
+    fun checkJsonKey(json: JsonObject, key: String): String {
+        if (!json.has(key)) {
+            throw JsonParseException("Required field does not exist: $key")
+        } else if (!json.get(key).isJsonPrimitive) {
+            throw JsonParseException("Wrong field `$key` type: ${json.get(key)::class.java}")
+        }
+        return json.get(key).asString
+    }
+}
+
+object MavenRepositoryConfigSerializer
+    : JsonDeserializer<MavenRepositoryConfig> {
+
+    override fun deserialize(
+        json: JsonElement,
+        typeOfT: Type,
+        context: JsonDeserializationContext
+    ): MavenRepositoryConfig {
+        return when (json) {
+            is JsonObject -> {
+                MavenRepositoryConfig(
+                    id = json.get("id")?.asString,
+                    url = URL(SerializerUtils.checkJsonKey(json, "url")),
+                    proxy = if (json.has("proxy") && json.get("proxy").isJsonObject)
+                        context.deserialize<Proxy>(
+                            json.getAsJsonObject("proxy"), Proxy::class.java
+                        ) else null,
+                    layout = json.get("layout")?.asString ?: "default",
+                    enableReleases = json.get("enableReleases")?.asBoolean ?: true,
+                    enableSnapshots = json.get("enableSnapshots")?.asBoolean ?: true,
+                    authentication = if (json.has("authentication") && json.get("authentication").isJsonObject)
+                        context.deserialize<Authentication>(
+                            json.getAsJsonObject("authentication"), Authentication::class.java
+                        ) else null
+                )
+            }
+            is JsonPrimitive -> {
+                MavenRepositoryConfig(url = URL(json.asString))
+            }
+            else -> {
+                throw JsonParseException("Unsupported Maven warehouse configuration type.")
+            }
+        }
+    }
+}
+
+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)
+    }
+
+}