core: enhanced pdf support

packages/hydrooj/package.json

@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "3.2.28",
+    "version": "3.2.29",
     "bin": "bin/hydrooj.js",
     "main": "src/loader",
     "module": "src/loader",

packages/hydrooj/src/handler/problem.ts

@@ -628,7 +628,7 @@ export class ProblemFileDownloadHandler extends ProblemDetailHandler {
             this.response.etag = file.etag;
             this.response.body = await storage.get(target);
             this.response.type = file['Content-Type'] || fileType;
-            this.response.disposition = `attachment; filename=${encodeURIComponent(filename)}`;
+            if (!noDisposition) this.response.disposition = `attachment; filename=${encodeURIComponent(filename)}`;
         } else {
             this.response.redirect = await storage.signDownloadLink(
                 target, noDisposition ? undefined : filename, false, 'user',