sS googleSignIn_signInButton(S verifyURL) {

  ret googleSignIn_signInButton(verifyURL, "", "");

}

sS googleSignIn_signInButton(S verifyURL, S onSuccess, S onSignOut) {

  ret [[<div class="g-signin2" data-onsuccess="onSignIn"></div>

    <script>

    function onSignIn(googleUser) {

      console.log("Signing in");

      var profile = googleUser.getBasicProfile();

      var email = profile.getEmail();

      if (email != "") {

        var token = googleUser.getAuthResponse().id_token;

        console.log("Email: " + email + "\nToken: " + token);

        var myKeyVals = { token: token };

        $.ajax({

          type: "POST",

          url: "$VERIFYURL",

          data: myKeyVals,

          dataType: "text",

          success: function(data) {

            $ONSUCCESS

          }

        });

      }

    }

    function signOut() {

      var auth2 = gapi.auth2.getAuthInstance();

      auth2.signOut().then(function () { $ONSIGNOUT});

    }

    </script>

  ]].replace("$VERIFYURL", verifyURL)

    .replace("$ONSUCCESS", onSuccess)

    .replace("$ONSIGNOUT", onSignOut);

}