feat: add middleware

src/index.js

@@ -1,3 +1,54 @@
+import superagent from 'superagent';
+
+const getResource = (url) =>
+  new Promise((resolve, reject) => {
+    try {
+      superagent.get(url).end((err, result) => {
+        if (err) resolve(result || err.message);
+        else resolve(result);
+      });
+    } catch (err) {
+      reject(err);
+    }
+  });
+
 export default function applyConfig(config) {
-  return config
+  const { staticFiles } = config.settings;
+  // EXAMPLE:
+  // config.settings.staticFiles = {
+  //   'favicon.ico': {
+  //     url: favicon, // webpack loaded resource
+  //     contentType: 'image/ico',
+  //   },
+  // };
+
+  if (__SERVER__ && staticFiles) {
+    const express = require('express');
+
+    const staticResourcesMiddleware = express.Router();
+    staticResourcesMiddleware.id = 'volto-middleware-staticresources';
+    staticResourcesMiddleware.all('**', async (req, res, next) => {
+      Object.keys(staticFiles).forEach((f) => {
+        if (req.originalUrl.includes(f)) {
+          const url = staticFiles[f].url;
+          getResource(url)
+            .then((resource) => {
+              res.set('Content-Type', staticFiles[f].contentType);
+              res.set('Content-Disposition', `inline`);
+              res.send(resource.body);
+            })
+            .catch((err) => res.status(400).send(err));
+        }
+      });
+
+      next();
+    });
+
+    config.settings.expressMiddleware = [
+      ...config.settings.expressMiddleware,
+      staticResourcesMiddleware,
+    ];
+  }
+
+  return config;
 }