function accountExistsRedirectTenant()

in auth-next/multi-tenancy.js [301:347]

• 26 lines of code
• 3 McCabe index (conditional complexity)

function accountExistsRedirectTenant(auth, samlProvider, googleProvider, goToApp) {
  // [START multitenant_account_exists_redirect]
  const { signInWithRedirect, getRedirectResult, fetchSignInMethodsForEmail, linkWithCredential } = require("firebase/auth");
  // Step 1.
  // User tries to sign in to SAML provider.
  auth.tenantId = 'TENANT_ID';
  signInWithRedirect(auth, samlProvider);
  var pendingCred;
  // Redirect back from SAML IDP. auth.tenantId is null after redirecting.
  getRedirectResult(auth).catch((error) => {
    if (error.code === 'auth/account-exists-with-different-credential') {
      // Step 2.
      // User's email already exists.
      const tenantId = error.tenantId;
      // The pending SAML credential.
      pendingCred = error.credential;
      // The provider account's email address.
      const email = error.email;
      // Need to set the tenant ID again as the page was reloaded and the
      // previous setting was reset.
      auth.tenantId = tenantId;
      // Get sign-in methods for this email.
      fetchSignInMethodsForEmail(auth, email)
        .then((methods) => {
          // Step 3.
          // Ask the user to sign in with existing Google account.
          if (methods[0] == 'google.com') {
            signInWithRedirect(auth, googleProvider);
          }
        });
    }
  });

  // Redirect back from Google. auth.tenantId is null after redirecting.
  getRedirectResult(auth).then((result) => {
    // Step 4
    // Link the SAML AuthCredential to the existing user.
    // result.user.tenantId is 'TENANT_ID'.
    linkWithCredential(result.user, pendingCred)
      .then((linkResult) => {
        // SAML account successfully linked to the existing
        // user.
        goToApp();
      });
  });
  // [END multitenant_account_exists_redirect]
}