Slack MCP Server

from fastmcp.server import FastMCP from fastmcp.server.auth import BearerAuthProvider from fastmcp.server.auth.providers.bearer import RSAKeyPair import slack_client import slack_endpoints from dotenv import load_dotenv import os # Load environment variables from .env file load_dotenv() # Read RSA key pair from environment variables or generate a new one if not available import base64 private_key_b64 = os.getenv("RSA_PRIVATE_KEY") public_key_b64 = os.getenv("RSA_PUBLIC_KEY") if private_key_b64 and public_key_b64: from pydantic import SecretStr # Decode from base64 to PEM string private_key = base64.b64decode(private_key_b64.encode()).decode("utf-8") public_key = base64.b64decode(public_key_b64.encode()).decode("utf-8") key_pair = RSAKeyPair(private_key=SecretStr(private_key), public_key=public_key) print("Using RSA keys from environment variables (base64 decoded)") else: # Generate new keys for development or if keys are not provided print("WARNING: RSA keys not found in environment variables, generating temporary keys") key_pair = RSAKeyPair.generate() # Print keys to be added to .env file (only in development) if os.getenv("ENV", "development") == "development": print("\033[93m") print("Add these keys to your .env file to avoid generating new keys each time:") print(f"RSA_PRIVATE_KEY='{key_pair.private_key.get_secret_value()}'") print(f"RSA_PUBLIC_KEY='{key_pair.public_key}'") print("\033[0m") # Configure bearer token authentication with the public key auth_provider = BearerAuthProvider( public_key=key_pair.public_key # Use the public key for JWT validation ) # Create FastMCP application with authentication mcp = FastMCP(name="slack", auth=auth_provider) # Initialize Slack client slack_client_instance = slack_client.SlackClient(token=os.getenv("SLACK_BOT_TOKEN")) # Setup endpoints with the app and client slack_endpoints.setup_endpoints(mcp, slack_client_instance) # Generate a JWT token for clients to use def generate_client_token(): # Create a token with the API_TOKEN as subject for easy identification return key_pair.create_token( subject="slack-mcp-server", issuer="slack-mcp-server", audience="slack-mcp-client", scopes=["read"], # Only read permissions expires_in_seconds=3600 * 24 # 24 hours ) # Generate a sample token for client use client_token = generate_client_token() print(f"Server starting on port with JWT bearer token authentication enabled") print("\033[93m") print("Use the following token for authentication:") print(f"Bearer {client_token}") print("\033[0m") if __name__ == "__main__": # Get port from environment variable or use default 8000 port = int(os.getenv("PORT", "8000")) # Run the server with SSE transport on the specified port mcp.run(transport="sse", port=port)