function getCredentials()

in tampermonkey.js [60:95]
29 lines of code
3 McCabe index (conditional complexity)

  function getCredentials() {
    const encodedSAML = $('input[name="SAMLResponse"]').val();
    const role = $('input[name="roleIndex"]:checked').val();
    if(!role) return; // Nothing was selected

    // Parse SAML token into an XML DOM we can use
    const rawSAML = atob(encodedSAML);
    const parsedSAML = $.parseXML(rawSAML);
    const $saml = $(parsedSAML);

    const idp = getIDPForRole($saml, role);
    const duration = getSessionDurationForRole($saml, role);

    // Request temporary access keys from AWS STS
    return STS.assumeRoleWithSAML({
      PrincipalArn: idp,
      RoleArn: role,
      SAMLAssertion: encodedSAML, /* SAML Token Base64 encoded */
      DurationSeconds: duration
    }).promise()
      .then((data)=> {
        const accountId = role.substr(13, 12);
        const roleName = role.substr(role.lastIndexOf('/')+1);

        // Render popup with the new credentials
        displayCredentials(accountId, roleName,
          data.Credentials.AccessKeyId,
          data.Credentials.SecretAccessKey,
          data.Credentials.SessionToken,
          data.Credentials.Expiration);
      })
      .catch((err) => {
        const message = err.message ? err.message : JSON.stringify(err, null, 2);
        alert(message);
      });
  }