Deprecate API v2 (#7761)

* deprecate api-v2

* remove v2 test helpers

* remove unused string

website/server/libs/encryption.js

@@ -0,0 +1,24 @@
+import {
+  createCipher,
+  createDecipher,
+} from 'crypto';
+import nconf from 'nconf';
+
+const algorithm = 'aes-256-ctr';
+const SESSION_SECRET = nconf.get('SESSION_SECRET');
+
+export function encrypt (text) {
+  let cipher = createCipher(algorithm,  SESSION_SECRET);
+  let crypted = cipher.update(text, 'utf8', 'hex');
+
+  crypted += cipher.final('hex');
+  return crypted;
+}
+
+export function decrypt (text) {
+  let decipher = createDecipher(algorithm, SESSION_SECRET);
+  let dec = decipher.update(text, 'hex', 'utf8');
+
+  dec += decipher.final('utf8');
+  return dec;
+}