File size: 15,217 Bytes

a5d718a

#!/usr/bin/env node
import { createServer } from 'node:http';
import { createInterface } from 'node:readline';
import { URL } from 'node:url';
import { Client } from '../../client/index.js';
import { StreamableHTTPClientTransport } from '../../client/streamableHttp.js';
import { CallToolResultSchema, ListToolsResultSchema } from '../../types.js';
import { UnauthorizedError } from '../../client/auth.js';
import { InMemoryOAuthClientProvider } from './simpleOAuthClientProvider.js';
// Configuration
const DEFAULT_SERVER_URL = 'http://localhost:3000/mcp';
const CALLBACK_PORT = 8090; // Use different port than auth server (3001)
const CALLBACK_URL = `http://localhost:${CALLBACK_PORT}/callback`;
/**

 * Interactive MCP client with OAuth authentication

 * Demonstrates the complete OAuth flow with browser-based authorization

 */
class InteractiveOAuthClient {
    constructor(serverUrl, clientMetadataUrl) {
        this.serverUrl = serverUrl;
        this.clientMetadataUrl = clientMetadataUrl;
        this.client = null;
        this.rl = createInterface({
            input: process.stdin,
            output: process.stdout
        });
    }
    /**

     * Prompts user for input via readline

     */
    async question(query) {
        return new Promise(resolve => {
            this.rl.question(query, resolve);
        });
    }
    /**

     * Example OAuth callback handler - in production, use a more robust approach

     * for handling callbacks and storing tokens

     */
    /**

     * Starts a temporary HTTP server to receive the OAuth callback

     */
    async waitForOAuthCallback() {
        return new Promise((resolve, reject) => {
            const server = createServer((req, res) => {
                // Ignore favicon requests
                if (req.url === '/favicon.ico') {
                    res.writeHead(404);
                    res.end();
                    return;
                }
                console.log(`📥 Received callback: ${req.url}`);
                const parsedUrl = new URL(req.url || '', 'http://localhost');
                const code = parsedUrl.searchParams.get('code');
                const error = parsedUrl.searchParams.get('error');
                if (code) {
                    console.log(`✅ Authorization code received: ${code?.substring(0, 10)}...`);
                    res.writeHead(200, { 'Content-Type': 'text/html' });
                    res.end(`

            <html>

              <body>

                <h1>Authorization Successful!</h1>

                <p>You can close this window and return to the terminal.</p>

                <script>setTimeout(() => window.close(), 2000);</script>

              </body>

            </html>

          `);
                    resolve(code);
                    setTimeout(() => server.close(), 3000);
                }
                else if (error) {
                    console.log(`❌ Authorization error: ${error}`);
                    res.writeHead(400, { 'Content-Type': 'text/html' });
                    res.end(`

            <html>

              <body>

                <h1>Authorization Failed</h1>

                <p>Error: ${error}</p>

              </body>

            </html>

          `);
                    reject(new Error(`OAuth authorization failed: ${error}`));
                }
                else {
                    console.log(`❌ No authorization code or error in callback`);
                    res.writeHead(400);
                    res.end('Bad request');
                    reject(new Error('No authorization code provided'));
                }
            });
            server.listen(CALLBACK_PORT, () => {
                console.log(`OAuth callback server started on http://localhost:${CALLBACK_PORT}`);
            });
        });
    }
    async attemptConnection(oauthProvider) {
        console.log('🚢 Creating transport with OAuth provider...');
        const baseUrl = new URL(this.serverUrl);
        const transport = new StreamableHTTPClientTransport(baseUrl, {
            authProvider: oauthProvider
        });
        console.log('🚢 Transport created');
        try {
            console.log('🔌 Attempting connection (this will trigger OAuth redirect)...');
            await this.client.connect(transport);
            console.log('✅ Connected successfully');
        }
        catch (error) {
            if (error instanceof UnauthorizedError) {
                console.log('🔐 OAuth required - waiting for authorization...');
                const callbackPromise = this.waitForOAuthCallback();
                const authCode = await callbackPromise;
                await transport.finishAuth(authCode);
                console.log('🔐 Authorization code received:', authCode);
                console.log('🔌 Reconnecting with authenticated transport...');
                await this.attemptConnection(oauthProvider);
            }
            else {
                console.error('❌ Connection failed with non-auth error:', error);
                throw error;
            }
        }
    }
    /**

     * Establishes connection to the MCP server with OAuth authentication

     */
    async connect() {
        console.log(`🔗 Attempting to connect to ${this.serverUrl}...`);
        const clientMetadata = {
            client_name: 'Simple OAuth MCP Client',
            redirect_uris: [CALLBACK_URL],
            grant_types: ['authorization_code', 'refresh_token'],
            response_types: ['code'],
            token_endpoint_auth_method: 'client_secret_post'
        };
        console.log('🔐 Creating OAuth provider...');
        const oauthProvider = new InMemoryOAuthClientProvider(CALLBACK_URL, clientMetadata, (redirectUrl) => {
            console.log(`\n🔗 Please open this URL in your browser to authorize:\n  ${redirectUrl.toString()}`);
        }, this.clientMetadataUrl);
        console.log('🔐 OAuth provider created');
        console.log('👤 Creating MCP client...');
        this.client = new Client({
            name: 'simple-oauth-client',
            version: '1.0.0'
        }, { capabilities: {} });
        console.log('👤 Client created');
        console.log('🔐 Starting OAuth flow...');
        await this.attemptConnection(oauthProvider);
        // Start interactive loop
        await this.interactiveLoop();
    }
    /**

     * Main interactive loop for user commands

     */
    async interactiveLoop() {
        console.log('\n🎯 Interactive MCP Client with OAuth');
        console.log('Commands:');
        console.log('  list - List available tools');
        console.log('  call <tool_name> [args] - Call a tool');
        console.log('  stream <tool_name> [args] - Call a tool with streaming (shows task status)');
        console.log('  quit - Exit the client');
        console.log();
        while (true) {
            try {
                const command = await this.question('mcp> ');
                if (!command.trim()) {
                    continue;
                }
                if (command === 'quit') {
                    console.log('\n👋 Goodbye!');
                    this.close();
                    process.exit(0);
                }
                else if (command === 'list') {
                    await this.listTools();
                }
                else if (command.startsWith('call ')) {
                    await this.handleCallTool(command);
                }
                else if (command.startsWith('stream ')) {
                    await this.handleStreamTool(command);
                }
                else {
                    console.log("❌ Unknown command. Try 'list', 'call <tool_name>', 'stream <tool_name>', or 'quit'");
                }
            }
            catch (error) {
                if (error instanceof Error && error.message === 'SIGINT') {
                    console.log('\n\n👋 Goodbye!');
                    break;
                }
                console.error('❌ Error:', error);
            }
        }
    }
    async listTools() {
        if (!this.client) {
            console.log('❌ Not connected to server');
            return;
        }
        try {
            const request = {
                method: 'tools/list',
                params: {}
            };
            const result = await this.client.request(request, ListToolsResultSchema);
            if (result.tools && result.tools.length > 0) {
                console.log('\n📋 Available tools:');
                result.tools.forEach((tool, index) => {
                    console.log(`${index + 1}. ${tool.name}`);
                    if (tool.description) {
                        console.log(`   Description: ${tool.description}`);
                    }
                    console.log();
                });
            }
            else {
                console.log('No tools available');
            }
        }
        catch (error) {
            console.error('❌ Failed to list tools:', error);
        }
    }
    async handleCallTool(command) {
        const parts = command.split(/\s+/);
        const toolName = parts[1];
        if (!toolName) {
            console.log('❌ Please specify a tool name');
            return;
        }
        // Parse arguments (simple JSON-like format)
        let toolArgs = {};
        if (parts.length > 2) {
            const argsString = parts.slice(2).join(' ');
            try {
                toolArgs = JSON.parse(argsString);
            }
            catch {
                console.log('❌ Invalid arguments format (expected JSON)');
                return;
            }
        }
        await this.callTool(toolName, toolArgs);
    }
    async callTool(toolName, toolArgs) {
        if (!this.client) {
            console.log('❌ Not connected to server');
            return;
        }
        try {
            const request = {
                method: 'tools/call',
                params: {
                    name: toolName,
                    arguments: toolArgs
                }
            };
            const result = await this.client.request(request, CallToolResultSchema);
            console.log(`\n🔧 Tool '${toolName}' result:`);
            if (result.content) {
                result.content.forEach(content => {
                    if (content.type === 'text') {
                        console.log(content.text);
                    }
                    else {
                        console.log(content);
                    }
                });
            }
            else {
                console.log(result);
            }
        }
        catch (error) {
            console.error(`❌ Failed to call tool '${toolName}':`, error);
        }
    }
    async handleStreamTool(command) {
        const parts = command.split(/\s+/);
        const toolName = parts[1];
        if (!toolName) {
            console.log('❌ Please specify a tool name');
            return;
        }
        // Parse arguments (simple JSON-like format)
        let toolArgs = {};
        if (parts.length > 2) {
            const argsString = parts.slice(2).join(' ');
            try {
                toolArgs = JSON.parse(argsString);
            }
            catch {
                console.log('❌ Invalid arguments format (expected JSON)');
                return;
            }
        }
        await this.streamTool(toolName, toolArgs);
    }
    async streamTool(toolName, toolArgs) {
        if (!this.client) {
            console.log('❌ Not connected to server');
            return;
        }
        try {
            // Using the experimental tasks API - WARNING: may change without notice
            console.log(`\n🔧 Streaming tool '${toolName}'...`);
            const stream = this.client.experimental.tasks.callToolStream({
                name: toolName,
                arguments: toolArgs
            }, CallToolResultSchema, {
                task: {
                    taskId: `task-${Date.now()}`,
                    ttl: 60000
                }
            });
            // Iterate through all messages yielded by the generator
            for await (const message of stream) {
                switch (message.type) {
                    case 'taskCreated':
                        console.log(`✓ Task created: ${message.task.taskId}`);
                        break;
                    case 'taskStatus':
                        console.log(`⟳ Status: ${message.task.status}`);
                        if (message.task.statusMessage) {
                            console.log(`  ${message.task.statusMessage}`);
                        }
                        break;
                    case 'result':
                        console.log('✓ Completed!');
                        message.result.content.forEach(content => {
                            if (content.type === 'text') {
                                console.log(content.text);
                            }
                            else {
                                console.log(content);
                            }
                        });
                        break;
                    case 'error':
                        console.log('✗ Error:');
                        console.log(`  ${message.error.message}`);
                        break;
                }
            }
        }
        catch (error) {
            console.error(`❌ Failed to stream tool '${toolName}':`, error);
        }
    }
    close() {
        this.rl.close();
        if (this.client) {
            // Note: Client doesn't have a close method in the current implementation
            // This would typically close the transport connection
        }
    }
}
/**

 * Main entry point

 */
async function main() {
    const args = process.argv.slice(2);
    const serverUrl = args[0] || DEFAULT_SERVER_URL;
    const clientMetadataUrl = args[1];
    console.log('🚀 Simple MCP OAuth Client');
    console.log(`Connecting to: ${serverUrl}`);
    if (clientMetadataUrl) {
        console.log(`Client Metadata URL: ${clientMetadataUrl}`);
    }
    console.log();
    const client = new InteractiveOAuthClient(serverUrl, clientMetadataUrl);
    // Handle graceful shutdown
    process.on('SIGINT', () => {
        console.log('\n\n👋 Goodbye!');
        client.close();
        process.exit(0);
    });
    try {
        await client.connect();
    }
    catch (error) {
        console.error('Failed to start client:', error);
        process.exit(1);
    }
    finally {
        client.close();
    }
}
// Run if this file is executed directly
main().catch(error => {
    console.error('Unhandled error:', error);
    process.exit(1);
});
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