Add tests for content filtering

website/server/libs/content.js

@@ -1,10 +1,15 @@
 import _ from 'lodash';
 import path from 'path';
+import fs from 'fs';
 import common from '../../common';
 import packageInfo from '../../../package.json';
 
 export const CONTENT_CACHE_PATH = path.join(__dirname, '/../../../content_cache/');
 
+const CACHED_HASHES = [
+
+];
+
 function walkContent (obj, lang, removedKeys = {}) {
   _.each(obj, (item, key, source) => {
     if (key in removedKeys && removedKeys[key] === true) {
@@ -33,3 +38,59 @@ export function getLocalizedContentResponse (langCode, removedKeys = {}) {
   const localizedContent = localizeContentData(common.content, langCode, removedKeys);
   return `{"success": true, "data": ${JSON.stringify(localizedContent)}, "appVersion": "${packageInfo.version}"}`;
 }
+
+export function hashForFilter (filter) {
+  let hash = 0;
+  let i; let
+    chr;
+  if (filter.length === 0) return '';
+  for (i = 0; i < filter.length; i++) { // eslint-disable-line
+    chr = filter.charCodeAt(i);
+    hash = ((hash << 5) - hash) + chr; // eslint-disable-line
+    hash |= 0; // eslint-disable-line
+  }
+  return String(hash);
+}
+
+export function serveContent (res, language, filter, isProd) {
+  // Build usable filter object
+  const filterObj = {};
+  filter.split(',').forEach(item => {
+    if (item.includes('.')) {
+      const [key, subkey] = item.split('.');
+      if (!filterObj[key]) {
+        filterObj[key] = {};
+      }
+      filterObj[key][subkey.trim()] = true;
+    } else {
+      filterObj[item.trim()] = true;
+    }
+  });
+
+  if (isProd) {
+    const filterHash = language + hashForFilter(filter);
+    if (CACHED_HASHES.includes(filterHash)) {
+      // Content is already cached, so just send it.
+      res.sendFile(`${CONTENT_CACHE_PATH}${filterHash}.json`);
+    } else {
+      // Content is not cached, so cache it and send it.
+      res.set({
+        'Content-Type': 'application/json',
+      });
+      const jsonResString = getLocalizedContentResponse(language, filterObj);
+      fs.writeFileSync(
+        `${CONTENT_CACHE_PATH}${filterHash}.json`,
+        jsonResString,
+        'utf8',
+      );
+      CACHED_HASHES.push(filterHash);
+      res.status(200).send(jsonResString);
+    }
+  } else {
+    res.set({
+      'Content-Type': 'application/json',
+    });
+    const jsonResString = getLocalizedContentResponse(language, filterObj);
+    res.status(200).send(jsonResString);
+  }
+}