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'use strict';
const Joi = require('joi');
const Pify = require('pify');
const Redis = require('redis');
const Twilio = require('twilio');
const internals = {};
internals.kContentType = 'application/xml'; // The content type used to respond
internals.kLanguage = 'es-mx'; // the language to use
internals.kMaxMessageLength = 30; // max message length in seconds
internals.kRecordingsSet = 'recordings';
internals.kRecordMessage = 'Graba tu mensaje despues del bip y ' +
'presiona cualquier tecla para finalizar. '; // the recording message
internals.kConfirmationMessage = 'Gracias. Tu mensaje es el número: ';
internals.kNotFoundMessage = 'Mensaje no encontrado. Adiós!';
internals.kRecordingSchema = Joi.object().keys({
url: Joi.string().required()
});
/**
* Handles the HTTP requests for the recording menu
*
* @class RecordingsController
* @param {DeadDrop.tConfiguration} config The configuration to
* initialize.
*/
module.exports = internals.RecordingsController = class RecordingsController {
constructor(config) {
this._redis = Redis.createClient(config.redis);
// Log an error if it happens.
this._redis.on('error', (err) => {
console.error(err);
});
}
/**
* Start recording process
*
* @function startRecording
* @memberof RecordingsController
* @instance
* @return {generator} a koa compatible handler generator function
*/
startRecording() {
return function * () {
const response = new Twilio.TwimlResponse();
// the action will default to post in the same URL, so no change
// required there.
response.say(internals.kRecordMessage, { language: internals.kLanguage })
.record({
maxLength: internals.kMaxMessageLength
});
this.type = internals.kContentType;
this.body = response.toString();
};
}
/**
* Saves the recording for later use
*
* @function saveRecording
* @memberof RecordingsController
* @instance
* @return {generator} a koa compatible handler generator function
*/
saveRecording() {
const self = this;
return function * () {
const zadd = Pify(self._redis.zadd.bind(self._redis));
const response = new Twilio.TwimlResponse();
const id = Date.now().toString().substr(2,10);
const url = this.request.body.RecordingUrl;
const separatedId = id.split('').join('. ');
const recording = {
url
};
yield self._validate(recording).catch((err) => {
this.throw(err.message, 422);
});
// Add to ordered set for quick fetches, and set for random fetches
yield zadd(internals.kRecordingsSet, parseInt(id), url);
response.say(`${internals.kConfirmationMessage}${separatedId}`, { language: internals.kLanguage });
this.type = internals.kContentType;
this.body = response.toString();
};
}
/**
* Gets a recording.
*
* @function getRecording
* @memberof RecordingsController
* @instance
* @return {generator} a koa compatible handler generator function
*/
getRecording() {
const self = this;
return function * (id) {
id = parseInt(id);
const zcard = Pify(self._redis.zcard.bind(self._redis));
const zrange = Pify(self._redis.zrange.bind(self._redis));
const zscore = Pify(self._redis.zscore.bind(self._redis));
const zrangebyscore = Pify(self._redis.zrangebyscore.bind(self._redis));
const response = new Twilio.TwimlResponse();
let location = null;
if (!id) {
const maxNumber = yield zcard(internals.kRecordingsSet);
const index = Math.floor(Math.random() * maxNumber); // get random between 0 and cardinality
location = yield zrange(internals.kRecordingsSet, index, index);
}
else {
location = yield zrangebyscore(internals.kRecordingsSet, id, id);
}
if (location && location.length > 0) {
if (!id) {
id = yield zscore(internals.kRecordingsSet, location[0]);
}
const separatedId = id.toString().split('').join('. ');
response.play(location[0]).say(separatedId, { language: internals.kLanguage });
}
else {
response.say(internals.kNotFoundMessage, { language: internals.kLanguage });
}
this.type = internals.kContentType;
this.body = response.toString();
};
}
// Validates the post schema
_validate(post) {
const validate = Pify(Joi.validate.bind(Joi));
return validate(post, internals.kRecordingSchema);
}
};
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