Webtask.io function for returning a fullfillment to Dialogflow.

fullfillmentFromSanity.js

/**
* @param context {WebtaskContext}
*/

/*
 * Set up your Sanity client with an project id, and the
 * name of your dataset. If you have set custom permissions
 * you'll also need to set it up with a access token, which
 * can be placed in webtask’s secrets. Note that in that case
 * you should also add some authentication to incoming requests.
 */

const sanityClient = require('@sanity/client')
const client = sanityClient({
  projectId: 'YOUR_PROJECT_ID',
  dataset: 'YOUR_DATASET_ID',
  token: '',
  useCdn: true
})

module.exports = function(context, cb) {
  // This assumes a valid post request from Dialogflow
  const intent = context.body.queryResult.intent.displayName
  
  /*
   * Query a list of the fullfillment strings from the posts referenced to
   * by the intent entry.
   */
  const query = `*[_type == 'intent' && intentName == $intent][0]{"fullfillments": fullfillments[0]->fullfillments}`;
  
  // Fetch the data data from Sanity, matching the Display name from Dialogflow
  client.fetch(query, { intent })
    .then(data => {
      const fullfillments = data.fullfillments
      if (fullfillments) {
        /*
         * Pick one of the strings randomingly in order to create some
         * basic variance.
         */
        const randomFullfillment = fullfillments[Math.floor(Math.random() * fullfillments.length)];
        
        // Return the string to Dialogflow.
        return cb(null, { fulfillmentText: randomFullfillment });
      }
      return cb(null, { fulfillmentText: 'Sorry, I didn\'t get that.' }); 
    }).catch(error => {
      console.error(error);
      return cb(null, { fulfillmentText: 'Sorry, something wrong happened.'  }); 
    });
};