add sitemap generator

package.json

@@ -105,12 +105,12 @@
     "glob": "^7.2.0",
     "husky": "^7.0.4",
     "identity-obj-proxy": "^3.0.0",
-    "jest": "^27.4.4",
+    "jest": "^27.4.5",
     "lint-staged": "^12.1.2",
     "mini-css-extract-plugin": "^2.4.5",
     "nock": "^13.2.1",
     "picocolors": "^1.0.0",
-    "plop": "^3.0.4",
+    "plop": "^3.0.5",
     "postcss": "^8.4.5",
     "postcss-loader": "^6.2.1",
     "prettier": "^2.5.1",

src/server/render/index.js

@@ -13,14 +13,19 @@ import configurationStore from 'client/store';
 import routes from 'client/routes';
 
 import renderHtml from './render-html';
+import sitemapGenerator from './sitemap-generator';
 
 const renderController = async (req, res) => {
   const store = configurationStore();
 
   const contexts = [];
 
   const loadBranchData = () => {
-    const promises = matchRoutes(routes, req.path).map(({ route, params }) => {
+    const routesMatch = matchRoutes(routes, req.path);
+
+    sitemapGenerator(req, routesMatch);
+
+    const promises = routesMatch.map(({ route, params }) => {
       // handling redirects in react-router v6
       // reference: https://gist.github.com/htdangkhoa/5b3407c749b6fb8cf05cfb591ec3ef07#handling-redirects-in-react-router-v6
       if (typeof route.to === 'string') {

src/server/render/sitemap-generator.js

@@ -0,0 +1,74 @@
+import fs from 'fs';
+import path from 'path';
+
+/**
+ * @param {string} xml
+ */
+const formatXml = (xml) => {
+  let s = xml;
+
+  // Create the padding element
+  const spaces = ' '.repeat(2);
+
+  // Regex to match xml tags.
+  const attrib = '\\s*\\w+(?:\\s*=\\s*(?:\\w+|"[^"\\\\]*(?:\\\\.[^"\\\\]*)*"))?';
+  const anyTag = new RegExp(`(<\\/?\\w+(?:${attrib})*\\s*\\/?>)`, 'g');
+
+  // Split into 'clean' new lines.
+  s = s
+    .split(anyTag)
+    .map((line) => line.trim())
+    .filter((line) => line !== '')
+    .map((line) => line.split(/\r?\n|\r/));
+
+  let pad = 0;
+  // 'flatten' the array.
+  return []
+    .concat(...s)
+    .map((line) => {
+      if (line[0] === '<' && line[1] === '/') pad -= 1;
+      const out = spaces.repeat(pad) + line;
+      if (line[0] === '<' && line[1] !== '/') pad += 1;
+
+      return out;
+    })
+    .join('\n');
+};
+
+/**
+ * @param {import('pure-http').IRequest} req
+ * @param {any[]} routesMatch
+ */
+const sitemapGenerator = (req, routesMatch = []) => {
+  const baseUrl = [`${req.protocol}://`, req.hostname, ![80, 443].includes(req.port) && `:${req.port}`]
+    .filter(Boolean)
+    .join('');
+
+  const urls = routesMatch.map(({ pathname }, i) => {
+    let s = `<url>\n<loc>${baseUrl}${pathname}</loc>\n</url>`;
+
+    if (i !== routesMatch.length - 1) {
+      s += '\n';
+    }
+
+    return s;
+  });
+
+  let beautyXml = '<?xml version="1.0" encoding="UTF-8"?>\n';
+
+  const template = `
+  <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
+    ${urls.join('')}
+  </urlset>
+  `;
+
+  beautyXml += formatXml(template);
+
+  const sitemapPath = path.resolve(process.cwd(), 'public/sitemap.xml');
+
+  fs.writeFileSync(sitemapPath, beautyXml, 'utf8');
+
+  return beautyXml;
+};
+
+export default sitemapGenerator;