Add WebSearch Agent

src/main/kotlin/tools/BaseAgent.kt

@@ -0,0 +1,16 @@
+package top.jie65535.mirai.tools
+
+import com.aallam.openai.api.chat.Tool
+import kotlinx.serialization.json.JsonObject
+
+abstract class BaseAgent(
+    val tool: Tool
+) {
+    open val isEnabled: Boolean = true
+
+    abstract suspend fun execute(args: JsonObject): String
+
+    override fun toString(): String {
+        return "${tool.function.name}: ${tool.function.description}"
+    }
+}

src/main/kotlin/tools/WebSearch.kt

@@ -0,0 +1,50 @@
+package top.jie65535.mirai.tools
+
+import com.aallam.openai.api.chat.Tool
+import com.aallam.openai.api.core.Parameters
+import io.ktor.client.*
+import io.ktor.client.engine.okhttp.*
+import io.ktor.client.request.*
+import io.ktor.client.statement.*
+import io.ktor.http.*
+import kotlinx.serialization.json.*
+import top.jie65535.mirai.PluginConfig
+import org.apache.commons.text.StringEscapeUtils
+
+class WebSearch : BaseAgent(
+    tool = Tool.function(
+        name = "search",
+        description = "通过互联网搜索一切",
+        parameters = Parameters.buildJsonObject {
+            put("type", "object")
+            putJsonObject("properties") {
+                putJsonObject("q") {
+                    put("type", "string")
+                    put("description", "The search query")
+                }
+            }
+            putJsonArray("required") {
+                add("q")
+            }
+        }
+    )
+) {
+    /**
+     * 插件配置了 SearXNG URL 时才允许启用
+     */
+    override val isEnabled: Boolean
+        get() = PluginConfig.searXngUrl.isNotEmpty()
+
+    private val httpClient by lazy {
+        HttpClient(OkHttp)
+    }
+
+    override suspend fun execute(args: JsonObject): String {
+        val q = args.getValue("q").jsonPrimitive.content
+        val response = httpClient.get(
+            "${PluginConfig.searXngUrl}?q=${q.encodeURLParameter(true)}&format=json"
+        )
+        val body = response.bodyAsText()
+        return StringEscapeUtils.unescapeJava(body)
+    }
+}