gmail.gs

/**
 * Callback for rendering the card for a specific Gmail message.
 * @param {Object} e The event object.
 * @return {CardService.Card} The card to show to the user.
 */
function onGmailMessage(e) {
  console.log(e);
  // Get the ID of the message the user has open.
  var messageId = e.gmail.messageId;

  // Get an access token scoped to the current message and use it for GmailApp
  // calls.
  var accessToken = e.gmail.accessToken;
  GmailApp.setCurrentMessageAccessToken(accessToken);

  // Get the subject of the email.
  var message = GmailApp.getMessageById(messageId);
  var subject = message.getThread().getFirstMessageSubject();

  // Remove labels and prefixes.
  subject = subject
      .replace(/^([rR][eE]|[fF][wW][dD])\:\s*/, '')
      .replace(/^\[.*?\]\s*/, '');

  // If neccessary, truncate the subject to fit in the image.
  subject = truncate(subject);

  return createCatCard(subject);
}

/**
 * Callback for rendering the card for the compose action dialog.
 * @param {Object} e The event object.
 * @return {CardService.Card} The card to show to the user.
 */
function onGmailCompose(e) {
  console.log(e);
  var header = CardService.newCardHeader()
      .setTitle('Insert cat')
      .setSubtitle('Add a custom cat image to your email message.');
  // Create text input for entering the cat's message.
  var input = CardService.newTextInput()
      .setFieldName('text')
      .setTitle('Caption')
      .setHint('What do you want the cat to say?');
  // Create a button that inserts the cat image when pressed.
  var action = CardService.newAction()
      .setFunctionName('onGmailInsertCat');
  var button = CardService.newTextButton()
      .setText('Insert cat')
      .setOnClickAction(action)
      .setTextButtonStyle(CardService.TextButtonStyle.FILLED);
  var buttonSet = CardService.newButtonSet()
      .addButton(button);
  // Assemble the widgets and return the card.
  var section = CardService.newCardSection()
      .addWidget(input)
      .addWidget(buttonSet);
  var card = CardService.newCardBuilder()
      .setHeader(header)
      .addSection(section);
  return card.build();
}

/**
 * Callback for inserting a cat into the Gmail draft.
 * @param {Object} e The event object.
 * @return {CardService.UpdateDraftActionResponse} The draft update response.
 */
function onGmailInsertCat(e) {
  console.log(e);
  // Get the text that was entered by the user.
  var text = e.formInput.text;
  // Use the "Cat as a service" API to get the cat image. Add a "time" URL
  // parameter to act as a cache buster.
  var now = new Date();
  var imageUrl = 'https://cataas.com/cat';
  if (text) {
    // Replace formward slashes in the text, as they break the CataaS API.
    var caption = text.replace(/\//g, ' ');
    imageUrl += Utilities.formatString('/says/%s?time=%s',
        encodeURIComponent(caption), now.getTime());
  }
  var imageHtmlContent = '<img style="display: block; max-height: 300px;" src="'
      + imageUrl + '"/>';
  var response = CardService.newUpdateDraftActionResponseBuilder()
      .setUpdateDraftBodyAction(CardService.newUpdateDraftBodyAction()
          .addUpdateContent(imageHtmlContent,CardService.ContentType.MUTABLE_HTML)
          .setUpdateType(CardService.UpdateDraftBodyType.IN_PLACE_INSERT))
      .build();
  return response;
}