Handle Menus and Store / Recall recordings (#2)

[rbdr/dead-drop] / lib / controllers / recordings.js

diff --git a/lib/controllers/recordings.js b/lib/controllers/recordings.js
new file mode 100644 (file)
index 0000000..591dbd5
--- /dev/null
+++ b/lib/controllers/recordings.js
@@ -0,0 +1,166 @@
+'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.kIdDateFormat = 'YYMMDDHHmmssSSS'; // derive ids from current date. 15 digits.
+internals.kRecordingsSet = 'recordings';
+internals.kRecordMessage = 'Graba tu mensaje despues del bip. ' +
+                           'Presiona cualquier tecla para finalizar tu mensaje. '; // 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);
+  }
+};