Dialogflow V2 and passing parameters in request body to webhook

Question

I am trying to pass parameters to an intent and I am calling the intent by it's Event name.

I understand that the parameters object has to be converted from a Json to a Struct, but for some reason the parameters are not passing. What am I doing wrong?

Please note I had to copy and paste the 'structjson.js' provided by Google into the same directory as my index.js because I am exporting to Firebase Functions, and I had to place some constants inside of certain functions within the structjson.js so I could export those functions to use in my index.js file.

• Expected response from Dialogflow: 'Your user ID is: 00000001'

• Actual response from Dialogflow: 'Your user ID is: ${n_digit}'

Request to Dialogflow Code

import * as functions from 'firebase-functions';
import * as dialogflow from 'dialogflow';
// // Start writing Firebase Functions
// // https://firebase.google.com/docs/functions/typescript
//
export const register = functions.https.onRequest((request, response) => {

    // Instantiates a session client
    const projectId = [MY_PROJECT_ID];
    const sessionId = '123456789';
    const languageCode = 'en-US';
    let config = {
            credentials: {
                private_key: [MY_PRIVATE_KEY],
                client_email: [MY_CLIENT_EMAIL]
            }
        }
    const sessionClient = new dialogflow.SessionsClient(config);

    // The path to identify the agent that owns the created intent.
    const sessionPath = sessionClient.sessionPath(projectId, sessionId);

    var structjson = require('./structjson')

    // The text query request.
    const req = {
    session: sessionPath,
    queryParams: {
        "resetContexts": true,
    },
    queryInput: {
      event: {
        name: 'init',
        parameters: structjson.jsonToStructProto({userID: '00000001'}),
        languageCode: languageCode,
      },
    },
    };

    sessionClient
    .detectIntent(req)
    .then((responses) => {
      const result = responses[0].queryResult;
      response.send(result.fulfillmentText);
    })
    .catch(err => {
      console.error('ERROR:', err);
    });
})

structjson.js

module.exports.jsonToStructProto = function jsonToStructProto(json) {
    var structjson = require('./structjson')
      const fields = {};
      for (const k in json) {
        fields[k] = structjson.jsonValueToProto(json[k]);
      }

      return {fields};
    }

    module.exports.jsonValueToProto = function jsonValueToProto(value) {
      const valueProto = {};
      const JSON_SIMPLE_TYPE_TO_PROTO_KIND_MAP = {
        [typeof 0]: 'numberValue',
        [typeof '']: 'stringValue',
        [typeof false]: 'boolValue',
      };

      if (value === null) {
        valueProto.kind = 'nullValue';
        valueProto.nullValue = 'NULL_VALUE';
      } else if (value instanceof Array) {
        valueProto.kind = 'listValue';
        valueProto.listValue = {values: value.map(jsonValueToProto)};
      } else if (typeof value === 'object') {
        valueProto.kind = 'structValue';
        valueProto.structValue = jsonToStructProto(value);
      } else if (typeof value in JSON_SIMPLE_TYPE_TO_PROTO_KIND_MAP) {
        const kind = JSON_SIMPLE_TYPE_TO_PROTO_KIND_MAP[typeof value];
        valueProto.kind = kind;
        valueProto[kind] = value;
      } else {
        console.warn('Unsupported value type ', typeof value);
      }
      return valueProto;
    }

    module.exports.structProtoToJson = function structProtoToJson(proto) {
      if (!proto || !proto.fields) {
        return {};
      }
      const json = {};
      for (const k in proto.fields) {
        json[k] = valueProtoToJson(proto.fields[k]);
      }
      return json;
    }

    module.exports.valueProtoToJson = function valueProtoToJson(proto) {

        const JSON_SIMPLE_VALUE_KINDS = new Set([
          'numberValue',
          'stringValue',
          'boolValue',
        ]);

      if (!proto || !proto.kind) {
        return null;
      }

      if (JSON_SIMPLE_VALUE_KINDS.has(proto.kind)) {
        return proto[proto.kind];
      } else if (proto.kind === 'nullValue') {
        return null;
      } else if (proto.kind === 'listValue') {
        if (!proto.listValue || !proto.listValue.values) {
          console.warn('Invalid JSON list value proto: ', JSON.stringify(proto));
        }
        return proto.listValue.values.map(valueProtoToJson);
      } else if (proto.kind === 'structValue') {
        return structProtoToJson(proto.structValue);
      } else {
        console.warn('Unsupported JSON value proto kind: ', proto.kind);
        return null;
      }
    }

Dialogflow webhook

function receiveParams (agent) {
    const parameter = request.body.queryResult.parameters;
     const n_digit = parameter.userID;
     agent.add('Your user ID is: ${n_digit}');
  }

  let intentMap = new Map();
  intentMap.set('init', receiveParams);  
  agent.handleRequest(intentMap);
});

Thank you in advance!

Answer 1

You can send parameters like

{  
  "fulfillmentText":"This is a text response",
  "fulfillmentMessages":[  ],
  "source":"example.com",
  "payload":{  
    "google":{  },
    "facebook":{  },
    "slack":{  }
  },
  "outputContexts":[  
    {  
      "name":"<Context Name>",
      "lifespanCount":5,
      "parameters":{  
        "<param name>":"<param value>"
      }
    }
  ],
  "followupEventInput":{  }
}

Using NodeJS client you can save params like

let param1 = [];
let param2 = {};
let ctx = {'name': '<context name>', 'lifespan': 5, 'parameters': {'param1':param1, 'param2': param2}};
agent.setContext(ctx);

and access these params like

let params = agent.getContext("<context name>").parameters;
let param1 = params.param1;
let param2 = params.param2; 

Check out my complete answer here.