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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { promises as fs } from 'node:fs';
import * as path from 'node:path';
import { Storage } from '../config/storage.js';
import { getErrorMessage } from '../utils/errors.js';
/**
* Interface for MCP OAuth tokens.
*/
export interface MCPOAuthToken {
accessToken: string;
refreshToken?: string;
expiresAt?: number;
tokenType: string;
scope?: string;
}
/**
* Interface for stored MCP OAuth credentials.
*/
export interface MCPOAuthCredentials {
serverName: string;
token: MCPOAuthToken;
clientId?: string;
tokenUrl?: string;
mcpServerUrl?: string;
updatedAt: number;
}
/**
* Class for managing MCP OAuth token storage and retrieval.
*/
export class MCPOAuthTokenStorage {
/**
* Get the path to the token storage file.
*
* @returns The full path to the token storage file
*/
private static getTokenFilePath(): string {
return Storage.getMcpOAuthTokensPath();
}
/**
* Ensure the config directory exists.
*/
private static async ensureConfigDir(): Promise<void> {
const configDir = path.dirname(this.getTokenFilePath());
await fs.mkdir(configDir, { recursive: true });
}
/**
* Load all stored MCP OAuth tokens.
*
* @returns A map of server names to credentials
*/
static async loadTokens(): Promise<Map<string, MCPOAuthCredentials>> {
const tokenMap = new Map<string, MCPOAuthCredentials>();
try {
const tokenFile = this.getTokenFilePath();
const data = await fs.readFile(tokenFile, 'utf-8');
const tokens = JSON.parse(data) as MCPOAuthCredentials[];
for (const credential of tokens) {
tokenMap.set(credential.serverName, credential);
}
} catch (error) {
// File doesn't exist or is invalid, return empty map
if ((error as NodeJS.ErrnoException).code !== 'ENOENT') {
console.error(
`Failed to load MCP OAuth tokens: ${getErrorMessage(error)}`,
);
}
}
return tokenMap;
}
/**
* Save a token for a specific MCP server.
*
* @param serverName The name of the MCP server
* @param token The OAuth token to save
* @param clientId Optional client ID used for this token
* @param tokenUrl Optional token URL used for this token
* @param mcpServerUrl Optional MCP server URL
*/
static async saveToken(
serverName: string,
token: MCPOAuthToken,
clientId?: string,
tokenUrl?: string,
mcpServerUrl?: string,
): Promise<void> {
await this.ensureConfigDir();
const tokens = await this.loadTokens();
const credential: MCPOAuthCredentials = {
serverName,
token,
clientId,
tokenUrl,
mcpServerUrl,
updatedAt: Date.now(),
};
tokens.set(serverName, credential);
const tokenArray = Array.from(tokens.values());
const tokenFile = this.getTokenFilePath();
try {
await fs.writeFile(
tokenFile,
JSON.stringify(tokenArray, null, 2),
{ mode: 0o600 }, // Restrict file permissions
);
} catch (error) {
console.error(
`Failed to save MCP OAuth token: ${getErrorMessage(error)}`,
);
throw error;
}
}
/**
* Get a token for a specific MCP server.
*
* @param serverName The name of the MCP server
* @returns The stored credentials or null if not found
*/
static async getToken(
serverName: string,
): Promise<MCPOAuthCredentials | null> {
const tokens = await this.loadTokens();
return tokens.get(serverName) || null;
}
/**
* Remove a token for a specific MCP server.
*
* @param serverName The name of the MCP server
*/
static async removeToken(serverName: string): Promise<void> {
const tokens = await this.loadTokens();
if (tokens.delete(serverName)) {
const tokenArray = Array.from(tokens.values());
const tokenFile = this.getTokenFilePath();
try {
if (tokenArray.length === 0) {
// Remove file if no tokens left
await fs.unlink(tokenFile);
} else {
await fs.writeFile(tokenFile, JSON.stringify(tokenArray, null, 2), {
mode: 0o600,
});
}
} catch (error) {
console.error(
`Failed to remove MCP OAuth token: ${getErrorMessage(error)}`,
);
}
}
}
/**
* Check if a token is expired.
*
* @param token The token to check
* @returns True if the token is expired
*/
static isTokenExpired(token: MCPOAuthToken): boolean {
if (!token.expiresAt) {
return false; // No expiry, assume valid
}
// Add a 5-minute buffer to account for clock skew
const bufferMs = 5 * 60 * 1000;
return Date.now() + bufferMs >= token.expiresAt;
}
/**
* Clear all stored MCP OAuth tokens.
*/
static async clearAllTokens(): Promise<void> {
try {
const tokenFile = this.getTokenFilePath();
await fs.unlink(tokenFile);
} catch (error) {
if ((error as NodeJS.ErrnoException).code !== 'ENOENT') {
console.error(
`Failed to clear MCP OAuth tokens: ${getErrorMessage(error)}`,
);
}
}
}
}
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