refactor: Proxy and cache avatar images (#907)

* refactor: proxy and cache user avatar images

* fix: extract keys

* fix: set avatar image URL

* fix: show the correct avatar in the list of available users in advanced request

* fix(s): set correct src URL for cached image

* fix: remove unexpired unused image when a user changes their avatar

* fix: requested changes

* refactor: use 'mime' package to detmerine file extension

* style: grammar

* refactor: checks if the default avatar is cached to avoid creating duplicates for different users

* fix: fix vulnerability

* fix: fix incomplete URL substring sanitization

* refactor: only cache avatar with http url protocol

* fix: remove log and correctly set the if statement for the cached image component

* fix: avatar images not showing on issues page

* style: formatting

---------

Co-authored-by: JoaquinOlivero <joaquin.olivero@hotmail.com>

server/routes/avatarproxy.ts

@@ -0,0 +1,32 @@
+import ImageProxy from '@server/lib/imageproxy';
+import logger from '@server/logger';
+import { Router } from 'express';
+
+const router = Router();
+
+const avatarImageProxy = new ImageProxy('avatar', '');
+// Proxy avatar images
+router.get('/*', async (req, res) => {
+  const imagePath = req.url.startsWith('/') ? req.url.slice(1) : req.url;
+
+  try {
+    const imageData = await avatarImageProxy.getImage(imagePath);
+
+    res.writeHead(200, {
+      'Content-Type': `image/${imageData.meta.extension}`,
+      'Content-Length': imageData.imageBuffer.length,
+      'Cache-Control': `public, max-age=${imageData.meta.curRevalidate}`,
+      'OS-Cache-Key': imageData.meta.cacheKey,
+      'OS-Cache-Status': imageData.meta.cacheMiss ? 'MISS' : 'HIT',
+    });
+
+    res.end(imageData.imageBuffer);
+  } catch (e) {
+    logger.error('Failed to proxy avatar image', {
+      imagePath,
+      errorMessage: e.message,
+    });
+  }
+});
+
+export default router;