mailinabox/management/templates/login.html

<style>
  .title {
    margin: 1em;
    text-align: center;
  }

  .subtitle {
    margin: 2em;
    text-align: center;
  }

  .login {
    margin: 0 auto;
    max-width: 32em;
  }

  .login #loginOtp {
    display: none;
  }

  #loginForm.is-twofactor #loginOtp {
    display: block
  }
</style>

<h1 class="title">{{hostname}}</h1>

{% if no_users_exist or no_admins_exist %}
<div class="row">
<div class="col-md-offset-2 col-md-8">
  {% if no_users_exist %}
  <p class="text-danger">There are no users on this system! To make an administrative user,
  log into this machine using SSH (like when you first set it up) and run:</p>
  <pre>cd mailinabox
sudo management/cli.py user add me@{{hostname}}
sudo management/cli.py user make-admin me@{{hostname}}</pre>
  {% else %}
  <p class="text-danger">There are no administrative users on this system! To make an administrative user,
  log into this machine using SSH (like when you first set it up) and run:</p>
  <pre>cd mailinabox
sudo management/cli.py user make-admin me@{{hostname}}</pre>
  {% endif %}
  <hr>
</div>
</div>
{% endif %}

<p class="subtitle">Log in here for your Mail-in-a-Box control panel.</p>

<div class="login">
  <form id="loginForm" class="form-horizontal" role="form" onsubmit="do_login(); return false;" method="get">
    <div class="form-group">
      <label for="inputEmail3" class="col-sm-3 control-label">Email</label>
      <div class="col-sm-9">
        <input name="email" type="email" class="form-control" id="loginEmail" placeholder="Email">
      </div>
    </div>
    <div class="form-group">
      <label for="inputPassword3" class="col-sm-3 control-label">Password</label>
      <div class="col-sm-9">
        <input name="password" type="password" class="form-control" id="loginPassword" placeholder="Password">
      </div>
    </div>
    <div class="form-group" id="loginOtp">
      <label for="loginOtpInput" class="col-sm-3 control-label">Code</label>
      <div class="col-sm-9">
          <input type="text" class="form-control" id="loginOtpInput" placeholder="6-digit code" autocomplete="off">
          <div class="help-block" style="margin-top: 5px; font-size: 90%">Enter the six-digit code generated by your two factor authentication app.</div>
      </div>
    </div>
    <div class="form-group">
      <div class="col-sm-offset-3 col-sm-9">
        <div class="checkbox">
          <label>
            <input name='remember' type="checkbox" id="loginRemember"> Remember me
          </label>
        </div>
      </div>
    </div>
    <div class="form-group">
      <div class="col-sm-offset-3 col-sm-9">
        <button type="submit" class="btn btn-default">Sign in</button>
      </div>
    </div>
  </form>
</div>

<script>
function do_login() {
  if ($('#loginEmail').val() == "") {
    show_modal_error("Login Failed", "Enter your email address.", function() {
      $('#loginEmail').focus();
    });
    return false;
  }

  if ($('#loginPassword').val() == "") {
    show_modal_error("Login Failed", "Enter your email password.", function() {
        $('#loginPassword').focus();
    });
    return false;
  }

  // Exchange the email address & password for an API key.
  api_credentials = { username: $('#loginEmail').val(), session_key: $('#loginPassword').val() }

  api(
  "/login",
  "POST",
  {},
  function(response) {
    // This API call always succeeds. It returns a JSON object indicating
    // whether the request was authenticated or not.
    if (response.status != 'ok') {
      if (response.status === 'missing-totp-token' || (response.status === 'invalid' && response.reason == 'invalid-totp-token')) {
        $('#loginForm').addClass('is-twofactor');
        if (response.reason === "invalid-totp-token") {
          show_modal_error("Login Failed", "Incorrect two factor authentication token.");
        } else {
          setTimeout(() => {
              $('#loginOtpInput').focus();
          });
        }
      } else {
        $('#loginForm').removeClass('is-twofactor');

        // Show why the login failed.
        show_modal_error("Login Failed", response.reason)

        // Reset any saved credentials.
        do_logout();
      }
    } else if (!("api_key" in response)) {
      // Login succeeded but user might not be authorized!
      show_modal_error("Login Failed", "You are not an administrator on this system.")

      // Reset any saved credentials.
      do_logout();

    } else {
      // Login succeeded.

      // Save the new credentials.
      api_credentials = { username: response.email,
                          session_key: response.api_key,
                          privileges: response.privileges };

      // Try to wipe the username/password information.
      $('#loginEmail').val('');
      $('#loginPassword').val('');
      $('#loginOtpInput').val('');
      $('#loginForm').removeClass('is-twofactor');

      // Remember the credentials.
      if (typeof localStorage != 'undefined' && typeof sessionStorage != 'undefined') {
        if ($('#loginRemember').val()) {
          localStorage.setItem("miab-cp-credentials", JSON.stringify(api_credentials));
          sessionStorage.removeItem("miab-cp-credentials");
        } else {
          localStorage.removeItem("miab-cp-credentials");
          sessionStorage.setItem("miab-cp-credentials", JSON.stringify(api_credentials));
        }
      }

      // Toggle menus.
      show_hide_menus();

      // Open the next panel the user wants to go to. Do this after the XHR response
      // is over so that we don't start a new XHR request while this one is finishing,
      // which confuses the loading indicator.
      setTimeout(function() {
        if (window.location.hash) {
          var panelid = window.location.hash.substring(1);
          show_panel(panelid);
        } else {
          show_panel(
            !switch_back_to_panel || switch_back_to_panel == "login"
            ? 'welcome'
            : switch_back_to_panel)
        }
      }, 300);

    }
  },
  undefined,
  {
    'x-auth-token': $('#loginOtpInput').val()
  });
}

function show_login() {
  $('#loginForm').removeClass('is-twofactor');
  $('#loginOtpInput').val('');
  $('#loginEmail,#loginPassword').each(function() {
    var input = $(this);
    if (!$.trim(input.val())) {
      input.focus();
      return false;
    }
  });
}

function show_hide_menus() {
  var is_logged_in = (api_credentials != null);
  var privs = api_credentials ? api_credentials.privileges : [];
  $('.if-logged-in').toggle(is_logged_in);
  $('.if-logged-in-admin, .if-logged-in-not-admin').toggle(false);
  if (is_logged_in) {
    $('.if-logged-in-not-admin').toggle(true);
    privs.forEach(function(priv) {
      $('.if-logged-in-' + priv).toggle(true);
      $('.if-logged-in-not-' + priv).toggle(false);
    });
  }
  $('.if-not-logged-in').toggle(!is_logged_in);
}
</script>