google custom voice (#245)

* google custom voice

* wip

* wip

* fix failing testcase

lib/models/google-custom-voice.js

@@ -0,0 +1,61 @@
+const Model = require('./model');
+const {promisePool} = require('../db');
+
+class GoogleCustomVoice extends Model {
+  constructor() {
+    super();
+  }
+
+  static async retrieveAllBySpeechCredentialSid(speech_credential_sid) {
+    const sql = `SELECT * FROM ${this.table} WHERE speech_credential_sid = ?`;
+    const [rows] = await promisePool.query(sql, speech_credential_sid);
+    return rows;
+  }
+
+  static async deleteAllBySpeechCredentialSid(speech_credential_sid) {
+    const sql = `DELETE FROM ${this.table} WHERE speech_credential_sid = ?`;
+    const [rows] = await promisePool.query(sql, speech_credential_sid);
+    return rows;
+  }
+
+  static async retrieveAllByLabel(service_provider_sid, account_sid, label) {
+    let sql;
+    if (account_sid) {
+      sql = `SELECT gcv.* FROM ${this.table} gcv 
+LEFT JOIN speech_credentials sc ON gcv.speech_credential_sid = sc.speech_credential_sid 
+WHERE sc.account_sid = ? OR (sc.account_sid is NULL && sc.service_provider_sid = ?) 
+${label ? 'AND label = ?' : 'AND label is NULL'}`;
+    } else {
+      sql = `SELECT gcv.* FROM ${this.table} gcv 
+LEFT JOIN speech_credentials sc ON gcv.speech_credential_sid = sc.speech_credential_sid 
+WHERE sc.service_provider_sid = ? ${label ? 'AND label = ?' : 'AND label is NULL'}`;
+    }
+    const [rows] = await promisePool.query(sql, [...(account_sid ?
+      [account_sid, service_provider_sid] : [service_provider_sid]), label]);
+    return rows;
+  }
+}
+GoogleCustomVoice.table = 'google_custom_voices';
+GoogleCustomVoice.fields = [
+  {
+    name: 'google_custom_voice_sid',
+    type: 'string',
+    primaryKey: true
+  },
+  {
+    name: 'model',
+    type: 'string',
+    required: true
+  },
+  {
+    name: 'reported_usage',
+    type: 'number'
+  },
+  {
+    name: 'name',
+    type: 'string',
+    required: true
+  }
+];
+
+module.exports = GoogleCustomVoice;