Embedded Wallet向けX（Twitter）設定

// This function constructs the authorization URL and redirects the user.
function redirectToXAuth() {
  const params = new URLSearchParams({
    response_type: 'code',
    client_id: 'YOUR_X_CLIENT_ID', // Replace with your X Client ID
    redirect_uri: 'YOUR_REDIRECT_URI', // Your callback URL
    scope: 'users.read email.read tweet.read', // Required scopes
    state: 'state', // A random string for security
    code_challenge: 'challenge', // A PKCE code challenge
    code_challenge_method: 'plain', // Use 'S256' in production
  });

  window.location.assign(`https://x.com/i/oauth2/authorize?${params.toString()}`);
}

// On your callback page, handle the redirect from X and get the access token.
async function handleXCallback() {
  const params = new URLSearchParams(window.location.search);
  const code = params.get('code');

  if (code) {
    try {
      // Exchange the authorization code for an access token.
      // Instead of calling X directly, we use the Sequence proxy.
      const tokenUrl = 'https://xproxy.sequence.xyz/api.x.com/2/oauth2/token';
      
      const tokenResponse = await fetch(tokenUrl, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/x-www-form-urlencoded',
        },
        body: new URLSearchParams({
          code,
          grant_type: 'authorization_code',
          client_id: 'YOUR_X_CLIENT_ID', // Replace with your X Client ID
          redirect_uri: 'YOUR_REDIRECT_URI', // Must match the one in Step 1
          code_verifier: 'challenge', // The PKCE code verifier
        }),
      });

      const { access_token } = await tokenResponse.json();

      if (!access_token) {
        throw new Error('Failed to obtain access token');
      }

      // Now you have the access token. You can pass it to the signIn method.
      console.log('Access Token:', access_token);
      return access_token;

    } catch (error) {
      console.error('X sign-in failed:', error);
    }
  }
}

// Call this function when your callback page loads
handleXCallback();