New project structure

Beta of extract.js for extracting english locale

server/lib/helpers.js

@@ -0,0 +1,39 @@
+'use strict';
+
+module.exports = {
+    enforce,
+    cleanupFromPost,
+    filterObject,
+    castToInteger
+};
+
+function enforce(condition, message) {
+    if (!condition) {
+        throw new Error(message);
+    }
+}
+
+function cleanupFromPost(value) {
+    return (value || '').toString().trim();
+}
+
+function filterObject(obj, allowedKeys) {
+    const result = {};
+    for (const key in obj) {
+        if (allowedKeys.has(key)) {
+            result[key] = obj[key];
+        }
+    }
+
+    return result;
+}
+
+function castToInteger(id) {
+    const val = parseInt(id);
+
+    if (!Number.isInteger(val)) {
+        throw new Error('Invalid id');
+    }
+
+    return val;
+}