Fixed proxying Etherpad with nginx. (#6388)

admin/package.json

@@ -7,6 +7,7 @@
     "dev": "vite",
     "build": "tsc && vite build",
     "lint": "eslint . --ext ts,tsx --report-unused-disable-directives --max-warnings 0",
+    "build-copy": "tsc && vite build --outDir ../src/templates/admin --emptyOutDir",
     "preview": "vite preview"
   },
   "dependencies": {

src/node/hooks/express/admin.ts

@@ -2,11 +2,13 @@
 import {ArgsExpressType} from "../../types/ArgsExpressType";
 import path from "path";
 import fs from "fs";
-import express from "express";
+import * as url from "node:url";
+import {MapArrayType} from "../../types/MapType";
+
 const settings = require('ep_etherpad-lite/node/utils/Settings');
 
-const ADMIN_PATH = path.join(settings.root, 'src', 'templates', 'admin');
-
+const ADMIN_PATH = path.join(settings.root, 'src', 'templates');
+const PROXY_HEADER = "x-proxy-path"
 /**
  * Add the admin navigation link
  * @param hookName {String} the name of the hook
@@ -15,10 +17,69 @@ const ADMIN_PATH = path.join(settings.root, 'src', 'templates', 'admin');
  * @return {*}
  */
 exports.expressCreateServer = (hookName: string, args: ArgsExpressType, cb: Function): any => {
-  args.app.use('/admin/', express.static(path.join(__dirname, '../../../templates/admin'), {maxAge: 1000 * 60 * 60 * 24}));
-  args.app.get('/admin/*', (_request:any, response:any)=>{
-      response.sendFile(path.resolve(__dirname,'../../../templates/admin', 'index.html'));
+
+  if (!fs.existsSync(ADMIN_PATH)) {
+    console.error('admin template not found, skipping admin interface. You need to rebuild it in /admin with pnpm run build-copy')
+    return cb();
+  }
+  args.app.get('/admin/*', (req: any, res: any) => {
+    // parse URL
+    const parsedUrl = url.parse(req.url);
+    // extract URL path
+    let pathname = ADMIN_PATH + `${parsedUrl.pathname}`;
+    // based on the URL path, extract the file extension. e.g. .js, .doc, ...
+    let ext = path.parse(pathname).ext;
+    // maps file extension to MIME typere
+    const map: MapArrayType<string> = {
+      '.ico': 'image/x-icon',
+      '.html': 'text/html',
+      '.js': 'text/javascript',
+      '.json': 'application/json',
+      '.css': 'text/css',
+      '.png': 'image/png',
+      '.jpg': 'image/jpeg',
+      '.wav': 'audio/wav',
+      '.mp3': 'audio/mpeg',
+      '.svg': 'image/svg+xml',
+      '.pdf': 'application/pdf',
+      '.doc': 'application/msword'
+    };
+
+    fs.exists(pathname, function (exist) {
+      if (!exist) {
+        // if the file is not found, return 404
+        res.statusCode = 200;
+        pathname = ADMIN_PATH + "/admin/index.html"
+        ext = path.parse(pathname).ext;
+      }
+
+      // if is a directory search for index file matching the extension
+      if (fs.statSync(pathname).isDirectory()) {
+        pathname = pathname + '/index.html';
+        ext = path.parse(pathname).ext;
+      }
+
+      // read file from file system
+      fs.readFile(pathname, function (err, data) {
+        if (err) {
+          res.statusCode = 500;
+          res.end(`Error getting the file: ${err}.`);
+        } else {
+          let dataToSend:Buffer|string = data
+          // if the file is found, set Content-type and send data
+          res.setHeader('Content-type', map[ext] || 'text/plain');
+          if (ext === ".html" || ext === ".js" || ext === ".css") {
+            if (req.header(PROXY_HEADER)) {
+              let string = data.toString()
+              dataToSend = string.replaceAll("/admin", req.header(PROXY_HEADER) + "/admin")
+              dataToSend = dataToSend.replaceAll("/socket.io", req.header(PROXY_HEADER) + "/socket.io")
+            }
+          }
+          res.end(dataToSend);
+        }
+      });
     })
+  });
   args.app.get('/admin', (req: any, res: any, next: Function) => {
     if ('/' !== req.path[req.path.length - 1]) return res.redirect('./admin/');
   })