merge features from hosted branch (#32)

major merge of features from the hosted branch that was created temporarily during the initial launch of jambonz.org

lib/utils/encrypt-decrypt.js

@@ -0,0 +1,35 @@
+const crypto = require('crypto');
+const algorithm = 'aes-256-ctr';
+const iv = crypto.randomBytes(16);
+const secretKey = crypto.createHash('sha256')
+  .update(String(process.env.JWT_SECRET))
+  .digest('base64')
+  .substr(0, 32);
+
+const encrypt = (text) => {
+  const cipher = crypto.createCipheriv(algorithm, secretKey, iv);
+  const encrypted = Buffer.concat([cipher.update(text), cipher.final()]);
+  const data = {
+    iv: iv.toString('hex'),
+    content: encrypted.toString('hex')
+  };
+  return JSON.stringify(data);
+};
+
+const decrypt = (data) => {
+  let hash;
+  try {
+    hash = JSON.parse(data);
+  } catch (err) {
+    console.log(`failed to parse json string ${data}`);
+    throw err;
+  }
+  const decipher = crypto.createDecipheriv(algorithm, secretKey, Buffer.from(hash.iv, 'hex'));
+  const decrpyted = Buffer.concat([decipher.update(Buffer.from(hash.content, 'hex')), decipher.final()]);
+  return decrpyted.toString();
+};
+
+module.exports = {
+  encrypt,
+  decrypt
+};