add simple admin service

local-admin/src/app/requestHandler.mjs

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+import { paths } from '../config/paths.mjs';
+import {
+  handleCreateArticle,
+  handleDeleteArticle,
+  handleListArticles,
+  handleUpdateArticle,
+} from '../entities/article/articleHandlers.mjs';
+import { handleListAssets, handleUploadAsset } from '../entities/asset/assetHandlers.mjs';
+import { httpError } from '../shared/http/httpError.mjs';
+import { sendError } from '../shared/http/sendError.mjs';
+import { serveFile } from '../shared/static/serveFile.mjs';
+
+export async function handleRequest(request, response) {
+  try {
+    return await routeRequest(request, response);
+  } catch (error) {
+    return sendError(response, error);
+  }
+}
+
+async function routeRequest(request, response) {
+  const url = new URL(request.url || '/', `http://${request.headers.host || 'localhost'}`);
+
+  if (url.pathname === '/api/articles' && request.method === 'GET') {
+    return await handleListArticles(request, response);
+  }
+
+  if (url.pathname === '/api/articles' && request.method === 'POST') {
+    return await handleCreateArticle(request, response);
+  }
+
+  if (url.pathname === '/api/assets' && request.method === 'GET') {
+    return await handleListAssets(request, response);
+  }
+
+  if (url.pathname === '/api/assets' && request.method === 'POST') {
+    return await handleUploadAsset(request, response);
+  }
+
+  const articleRoute = url.pathname.match(/^\/api\/articles\/(.+)$/);
+  if (articleRoute) {
+    return await routeArticleBySlug(request, response, decodeURIComponent(articleRoute[1]));
+  }
+
+  return await routeStaticFile(request, response, url.pathname);
+}
+
+async function routeArticleBySlug(request, response, slug) {
+  if (request.method === 'PUT') {
+    return await handleUpdateArticle(request, response, slug);
+  }
+
+  if (request.method === 'DELETE') {
+    return await handleDeleteArticle(request, response, slug);
+  }
+
+  throw httpError(405, 'Method not allowed');
+}
+
+async function routeStaticFile(request, response, pathname) {
+  if (request.method !== 'GET' && request.method !== 'HEAD') {
+    throw httpError(405, 'Method not allowed');
+  }
+
+  if (pathname.startsWith('/assets/')) {
+    return await serveFile(response, paths.webPublicRoot, pathname, request.method);
+  }
+
+  const adminPath = pathname === '/' ? '/index.html' : pathname;
+  return await serveFile(response, paths.adminPublicRoot, adminPath, request.method);
+}

local-admin/src/app/startServer.mjs

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+import { createServer } from 'node:http';
+import { paths } from '../config/paths.mjs';
+import { serverConfig } from '../config/server.mjs';
+import { handleRequest } from './requestHandler.mjs';
+
+export function startServer() {
+  const server = createServer(handleRequest);
+
+  server.on('error', (error) => {
+    if (error.code === 'EADDRINUSE') {
+      console.error(`Port ${serverConfig.port} is already in use. Run with ADMIN_PORT=3334 npm run admin:posts.`);
+      process.exit(1);
+    }
+
+    throw error;
+  });
+
+  server.listen(serverConfig.port, serverConfig.host, () => {
+    console.log(`Local posts admin: http://${serverConfig.host}:${serverConfig.port}`);
+    console.log(`Editing: ${paths.articlesFile}`);
+  });
+
+  for (const signal of ['SIGINT', 'SIGTERM']) {
+    process.on(signal, () => {
+      server.close(() => process.exit(0));
+    });
+  }
+
+  return server;
+}