build

OpenapiMcpServer.ts.txt

@@ -0,0 +1,329 @@
+import {
+    INodeType,
+    INodeTypeDescription,
+    IWebhookFunctions,
+    IWebhookResponseData,
+    ILoadOptionsFunctions,
+    INodePropertyOptions,
+} from 'n8n-workflow';
+import { getMcpTools } from "../lib/mcp_tool_convert";
+
+// ======================================================
+// Cache tools per URL
+// ======================================================
+const toolsCache = new Map<string, any[]>();
+
+// ======================================================
+// Load OpenAPI → MCP Tools
+// ======================================================
+async function loadTools(openapiUrl: string, filterTag: string, forceRefresh = false): Promise<any[]> {
+    const cacheKey = `${openapiUrl}::${filterTag}`;
+
+    if (!forceRefresh && toolsCache.has(cacheKey)) {
+        return toolsCache.get(cacheKey)!;
+    }
+
+    console.log(`[MCP] 🔄 Refreshing tools from ${openapiUrl} ...`);
+    const fetched = await getMcpTools(openapiUrl, filterTag);
+
+    console.log(`[MCP] ✅ Loaded ${fetched.length} tools`);
+    if (fetched.length > 0) {
+        console.log(`[MCP] Tools: ${fetched.map((t: any) => t.name).join(", ")}`);
+    }
+
+    toolsCache.set(cacheKey, fetched);
+    return fetched;
+}
+
+// ======================================================
+// JSON-RPC Types
+// ======================================================
+type JSONRPCRequest = {
+    jsonrpc: "2.0";
+    id: string | number;
+    method: string;
+    params?: any;
+    credentials?: any;
+};
+
+type JSONRPCResponse = {
+    jsonrpc: "2.0";
+    id: string | number;
+    result?: any;
+    error?: {
+        code: number;
+        message: string;
+        data?: any;
+    };
+};
+
+// ======================================================
+// Eksekusi Tool HTTP
+// ======================================================
+async function executeTool(
+    tool: any,
+    args: Record<string, any> = {},
+    baseUrl: string,
+    token?: string
+) {
+    const x = tool["x-props"] || {};
+    const method = (x.method || "GET").toUpperCase();
+    const path = x.path || `/${tool.name}`;
+    const url = `${baseUrl}${path}`;
+
+    const opts: RequestInit = {
+        method,
+        headers: {
+            "Content-Type": "application/json",
+            ...(token ? { Authorization: `Bearer ${token}` } : {}),
+        },
+    };
+
+    if (["POST", "PUT", "PATCH", "DELETE"].includes(method)) {
+        opts.body = JSON.stringify(args || {});
+    }
+
+    const res = await fetch(url, opts);
+    const contentType = res.headers.get("content-type") || "";
+
+    const data = contentType.includes("application/json")
+        ? await res.json()
+        : await res.text();
+
+    return {
+        success: res.ok,
+        status: res.status,
+        method,
+        path,
+        data,
+    };
+}
+
+// ======================================================
+// JSON-RPC Handler
+// ======================================================
+async function handleMCPRequest(
+    request: JSONRPCRequest,
+    tools: any[]
+): Promise<JSONRPCResponse> {
+    const { id, method, params, credentials } = request;
+
+    switch (method) {
+        case "initialize":
+            return {
+                jsonrpc: "2.0",
+                id,
+                result: {
+                    protocolVersion: "2024-11-05",
+                    capabilities: { tools: {} },
+                    serverInfo: { name: "n8n-mcp-server", version: "1.0.0" },
+                },
+            };
+
+        case "tools/list":
+            return {
+                jsonrpc: "2.0",
+                id,
+                result: {
+                    tools: tools.map((t) => {
+                        const inputSchema =
+                            typeof t.inputSchema === "object" && t.inputSchema?.type === "object"
+                                ? t.inputSchema
+                                : {
+                                    type: "object",
+                                    properties: {},
+                                    required: [],
+                                };
+
+                        return {
+                            name: t.name,
+                            description: t.description || "No description provided",
+                            inputSchema,
+                            "x-props": t["x-props"],
+                        };
+                    }),
+                },
+            };
+
+        case "tools/call": {
+            const toolName = params?.name;
+            const tool = tools.find((t) => t.name === toolName);
+
+            if (!tool) {
+                return {
+                    jsonrpc: "2.0",
+                    id,
+                    error: { code: -32601, message: `Tool '${toolName}' not found` },
+                };
+            }
+
+            try {
+                const baseUrl = credentials?.baseUrl;
+                const token = credentials?.token;
+
+                const result = await executeTool(
+                    tool,
+                    params?.arguments || {},
+                    baseUrl,
+                    token
+                );
+
+                const data = result.data.data;
+                const isObject = typeof data === "object" && data !== null;
+
+                return {
+                    jsonrpc: "2.0",
+                    id,
+                    result: {
+                        content: [
+                            isObject
+                                ? { type: "json", data }
+                                : { type: "text", text: JSON.stringify(data || result.data || result) },
+                        ],
+                    },
+                };
+            } catch (err: any) {
+                return {
+                    jsonrpc: "2.0",
+                    id,
+                    error: { code: -32603, message: err.message },
+                };
+            }
+        }
+
+        case "ping":
+            return { jsonrpc: "2.0", id, result: {} };
+
+        default:
+            return {
+                jsonrpc: "2.0",
+                id,
+                error: { code: -32601, message: `Method '${method}' not found` },
+            };
+    }
+}
+
+// ======================================================
+// MCP TRIGGER NODE
+// ======================================================
+export class OpenapiMcpServer implements INodeType {
+    description: INodeTypeDescription = {
+        displayName: 'OpenAPI MCP Server',
+        name: 'openapiMcpServer',
+        group: ['trigger'],
+        version: 1,
+        description: 'Runs an MCP Server inside n8n',
+        icon: 'file:icon.svg',
+        defaults: {
+            name: 'OpenAPI MCP Server'
+        },
+        credentials: [
+            { name: "openapiMcpServerCredentials", required: true },
+        ],
+        inputs: [],
+        outputs: ['main'],
+        webhooks: [
+            {
+                name: 'default',
+                httpMethod: 'POST',
+                responseMode: 'onReceived',
+                path: '={{$parameter["path"]}}',
+            },
+        ],
+        properties: [
+            {
+                displayName: "Path",
+                name: "path",
+                type: "string",
+                default: "mcp",
+            },
+            {
+                displayName: "OpenAPI URL",
+                name: "openapiUrl",
+                type: "string",
+                default: "",
+                placeholder: "https://example.com/openapi.json",
+            },
+            {
+                displayName: "Default Filter",
+                name: "defaultFilter",
+                type: "string",
+                default: "",
+                placeholder: "mcp | tag",
+            },
+            {
+                displayName: 'Available Tools (auto-refresh)',
+                name: 'toolList',
+                type: 'options',
+                typeOptions: {
+                    loadOptionsMethod: 'refreshToolList',
+                    refreshOnOpen: true,
+                },
+                default: 'all',
+                description: 'Daftar tools yang berhasil dimuat dari OpenAPI',
+            },
+        ],
+    };
+
+    // ==================================================
+    // LoadOptions
+    // ==================================================
+    methods = {
+        loadOptions: {
+            async refreshToolList(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
+                const openapiUrl = this.getNodeParameter("openapiUrl", 0) as string;
+                const filterTag = this.getNodeParameter("defaultFilter", 0) as string;
+
+                if (!openapiUrl) {
+                    return [{ name: "❌ No OpenAPI URL provided", value: "" }];
+                }
+
+                const tools = await loadTools(openapiUrl, filterTag, true);
+
+                return [
+                    { name: "All Tools", value: "all" },
+                    ...tools.map((t) => ({
+                        name: t.name,
+                        value: t.name,
+                        description: t.description,
+                    })),
+                ];
+            },
+        },
+    };
+
+    // ==================================================
+    // Webhook Handler
+    // ==================================================
+    async webhook(this: IWebhookFunctions): Promise<IWebhookResponseData> {
+        const openapiUrl = this.getNodeParameter("openapiUrl", 0) as string;
+        const filterTag = this.getNodeParameter("defaultFilter", 0) as string;
+
+        const tools = await loadTools(openapiUrl, filterTag, true);
+
+        const creds = await this.getCredentials("openapiMcpServerCredentials") as {
+            baseUrl: string;
+            token: string;
+        };
+
+        const body = this.getBodyData();
+
+        if (Array.isArray(body)) {
+            const responses = body.map((r) =>
+                handleMCPRequest({ ...r, credentials: creds }, tools)
+            );
+            return {
+                webhookResponse: await Promise.all(responses),
+            };
+        }
+
+        const single = await handleMCPRequest(
+            { ...(body as JSONRPCRequest), credentials: creds },
+            tools
+        );
+
+        return {
+            webhookResponse: single,
+        };
+    }
+}