playwright-mcp/src/server.ts

/**
 * Copyright (c) Microsoft Corporation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { Server } from '@modelcontextprotocol/sdk/server/index.js';
import { CallToolRequestSchema, ListResourcesRequestSchema, ListToolsRequestSchema, ReadResourceRequestSchema } from '@modelcontextprotocol/sdk/types.js';

import { Context } from './context';

import type { Tool } from './tools/tool';
import type { Resource } from './resources/resource';
import type { LaunchOptions } from 'playwright';

type Options = {
  name: string;
  version: string;
  tools: Tool[];
  resources: Resource[],
  userDataDir: string;
  launchOptions?: LaunchOptions;
};

export function createServerWithTools(options: Options): Server {
  const { name, version, tools, resources, userDataDir, launchOptions } = options;
  const context = new Context(userDataDir, launchOptions);
  const server = new Server({ name, version }, {
    capabilities: {
      tools: {},
      resources: {},
    }
  });

  server.setRequestHandler(ListToolsRequestSchema, async () => {
    return { tools: tools.map(tool => tool.schema) };
  });

  server.setRequestHandler(ListResourcesRequestSchema, async () => {
    return { resources: resources.map(resource => resource.schema) };
  });

  server.setRequestHandler(CallToolRequestSchema, async request => {
    const tool = tools.find(tool => tool.schema.name === request.params.name);
    if (!tool) {
      return {
        content: [{ type: 'text', text: `Tool "${request.params.name}" not found` }],
        isError: true,
      };
    }

    try {
      const result = await tool.handle(context, request.params.arguments);
      return result;
    } catch (error) {
      return {
        content: [{ type: 'text', text: String(error) }],
        isError: true,
      };
    }
  });

  server.setRequestHandler(ReadResourceRequestSchema, async request => {
    const resource = resources.find(resource => resource.schema.uri === request.params.uri);
    if (!resource)
      return { contents: [] };

    const contents = await resource.read(context, request.params.uri);
    return { contents };
  });

  server.close = async () => {
    await server.close();
    await context.close();
  };

  return server;
}