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server.js
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server.js
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const express = require("express");
const bodyParser = require("body-parser");
const { API_AI_KEY } = process.env || 'YOUR_API_KEY_DIALOGFLOW';
const URL = require("url");
const API_AI = require("apiai");
const DEFAULT_APP = API_AI_KEY ? API_AI(API_AI_KEY) : null;
const app = express();
const PORT = process.env.PORT || 3000;
app.set('view engine', 'ejs');
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
// Config Bot engines - DialogFlow
let randomize = (arr) => arr[Math.floor(Math.random() * arr.length)];
let sendResponse = ({ response, message }) => {
response.writeHead(200, { 'Content-Type': 'application/json' });
response.end(JSON.stringify(message));
};
let createTextMsg = (text) => {
return { messages: [{ text }] };
};
let handleResponse = (response) => ({ result, sessionId }) => {
let message;
if (result.source === 'agent') {
let randomMsg = randomize(result.fulfillment.messages);
message = randomMsg.payload ? randomMsg.payload : createTextMsg(randomMsg.speech);
} else if (result.source === 'domains') {
message = createTextMsg(result.fulfillment.speech);
}
message.set_attributes = Object.assign(message.set_attributes || {}, { DF_SESSION_ID: sessionId });
sendResponse({ response, message });
};
let handleError = (response) => (error) => {
let message = { error };
sendResponse({ response, message });
};
// Define all your routes, if you want to clean code, you can manage your dir yourself
app.get("/", (req, res) => res.render('index'));
app.get("/api/bot", (req, res) => {
let query = URL.parse(req.url, true).query;
let app = (query.API_AI_KEY) ? API_AI(query.API_AI_KEY) : DEFAULT_APP;
let newSessionId = (!query.DF_SESSION_ID || query.DF_SESSION_ID === "0") ? Math.random().toString().slice(2) : 0;
let sessionId = (query.DF_SESSION_ID && query.DF_SESSION_ID != "0") ? query.DF_SESSION_ID : newSessionId;
let contexts = [{
name: query.DF_CONTEXT || 'DEFAULT',
parameters: query,
}];
let request = app.textRequest(query.queryString, { sessionId, contexts });
request.on('response', handleResponse(res));
request.on('error', handleError(res));
request.end();
});
let server = app.listen(PORT, () => {
console.log("Listening on port %s", server.address().port)
});