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* OAuth Dynamic Client Registration Endpoint (RFC 7591)
*
* Required by Claude.ai custom connectors.
* Allows MCP clients to dynamically register themselves.
*/
import { Request, Response } from "express";
import { randomUUID } from "crypto";
import { logInfo, logError } from "../../logger";
/** Client registration request body */
interface ClientRegistrationRequest {
redirect_uris?: string[];
client_name?: string;
token_endpoint_auth_method?: string;
grant_types?: string[];
response_types?: string[];
}
/** Registered client data */
interface RegisteredClient {
client_id: string;
client_secret?: string;
redirect_uris: string[];
client_name?: string;
token_endpoint_auth_method: string;
grant_types: string[];
response_types: string[];
created_at: number;
}
// In-memory store for registered clients (in production, use persistent storage)
const registeredClients: Map<string, RegisteredClient> = new Map();
/**
* Dynamic Client Registration endpoint handler
*
* POST /register
*
* Accepts client metadata and returns client credentials.
* Supports public clients (no client_secret) for Claude.ai.
*/
export async function registerHandler(req: Request, res: Response): Promise<void> {
try {
const body = req.body as ClientRegistrationRequest;
const {
redirect_uris,
client_name,
token_endpoint_auth_method = "none",
grant_types = ["authorization_code", "refresh_token"],
response_types = ["code"],
} = body;
// Validate required fields
if (!redirect_uris || !Array.isArray(redirect_uris) || redirect_uris.length === 0) {
res.status(400).json({
error: "invalid_client_metadata",
error_description: "redirect_uris is required and must be a non-empty array",
});
return;
}
// Validate redirect URIs (must be valid URLs)
for (const uri of redirect_uris) {
try {
new URL(uri);
} catch {
res.status(400).json({
error: "invalid_redirect_uri",
error_description: `Invalid redirect URI: ${uri}`,
});
return;
}
}
// Generate client credentials
const client_id = randomUUID();
// For public clients (token_endpoint_auth_method: "none"), no secret is issued
// For confidential clients, generate a secret
let client_secret: string | undefined;
if (token_endpoint_auth_method !== "none") {
client_secret = randomUUID() + randomUUID(); // Long random secret
}
// Store client registration
const clientData: RegisteredClient = {
client_id,
client_secret,
redirect_uris,
client_name,
token_endpoint_auth_method,
grant_types,
response_types,
created_at: Date.now(),
};
registeredClients.set(client_id, clientData);
logInfo("New OAuth client registered via DCR", {
client_id,
client_name,
redirect_uris,
token_endpoint_auth_method,
});
// Return client credentials per RFC 7591
const response: Record<string, unknown> = {
client_id,
redirect_uris,
client_name,
token_endpoint_auth_method,
grant_types,
response_types,
};
// Only include client_secret for confidential clients
if (client_secret) {
response.client_secret = client_secret;
}
res.status(201).json(response);
} catch (error: unknown) {
logError("Error in dynamic client registration", { err: error as Error });
res.status(500).json({
error: "server_error",
error_description: "Failed to register client",
});
}
}
/**
* Get a registered client by ID
*/
export function getRegisteredClient(clientId: string) {
return registeredClients.get(clientId);
}
/**
* Validate a client's redirect URI
*/
export function isValidRedirectUri(clientId: string, redirectUri: string): boolean {
const client = registeredClients.get(clientId);
if (!client) {
// If client is not registered via DCR, allow any redirect URI
// (for backwards compatibility with static client_id configuration)
return true;
}
return client.redirect_uris.includes(redirectUri);
}
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