Feishu/Lark OpenAPI MCP

import crypto from 'crypto'; export function generateCodeVerifier(): string { return crypto.randomBytes(32).toString('base64url'); } export function generateCodeChallenge(codeVerifier: string): string { return crypto.createHash('sha256').update(codeVerifier).digest('base64url'); } export function generatePKCEPair(): { codeVerifier: string; codeChallenge: string } { const codeVerifier = generateCodeVerifier(); const codeChallenge = generateCodeChallenge(codeVerifier); return { codeVerifier, codeChallenge }; }