Moved unique identifier generation to lib/security

refs #9178

ghost/security/lib/identifier.js

@@ -0,0 +1,28 @@
+'use strict';
+
+let _private = {};
+
+// @TODO: replace with crypto.randomBytes
+_private.getRandomInt = function (min, max) {
+    return Math.floor(Math.random() * (max - min + 1)) + min;
+};
+
+/**
+ * Return a unique identifier with the given `len`.
+ *
+ * @param {Number} maxLength
+ * @return {String}
+ * @api private
+ */
+module.exports.uid = function uid(maxLength) {
+    var buf = [],
+        chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789',
+        charLength = chars.length,
+        i;
+
+    for (i = 0; i < maxLength; i = i + 1) {
+        buf.push(chars[_private.getRandomInt(0, charLength - 1)]);
+    }
+
+    return buf.join('');
+};

ghost/security/lib/index.js

@@ -11,5 +11,9 @@ module.exports = {
 
     get string() {
         return require('./string');
+    },
+
+    get identifier() {
+        return require('./identifier');
     }
 };