core: add log for file download event

packages/hydrooj/src/handler/problem.ts

@@ -21,6 +21,7 @@ import { PERM, PRIV } from '../model/builtin';
 import * as contest from '../model/contest';
 import * as discussion from '../model/discussion';
 import domain from '../model/domain';
+import * as oplog from '../model/oplog';
 import problem from '../model/problem';
 import record from '../model/record';
 import solution from '../model/solution';
@@ -477,6 +478,21 @@ export class ProblemFilesHandler extends ProblemDetailHandler {
         }
         if (this.pdoc.reference) this.pdoc = await problem.get(this.pdoc.reference.domainId, this.pdoc.reference.pid);
         const links = {};
+        const size = Math.sum(
+            this.pdoc[type === 'testdata' ? 'data' : 'additional_file']
+                .filter((i) => files.has(i.name))
+                .map((i) => i.size),
+        );
+        await oplog.add({
+            type: 'bulkDownload',
+            time: new Date(),
+            uid: this.user._id,
+            ip: this.request.ip,
+            fileType: 'problem',
+            target: Array.from(files).map((file) => `problem/${this.pdoc.domainId}/${this.pdoc.docId}/${type}/${file}`),
+            referer: this.request.referer,
+            size,
+        });
         for (const file of files) {
             // eslint-disable-next-line no-await-in-loop
             links[file] = await storage.signDownloadLink(
@@ -570,6 +586,16 @@ export class ProblemFileDownloadHandler extends ProblemDetailHandler {
         }
         const target = `problem/${this.pdoc.domainId}/${this.pdoc.docId}/${type}/${filename}`;
         const file = await storage.getMeta(target);
+        await oplog.add({
+            type: 'download',
+            time: new Date(),
+            uid: this.user._id,
+            ip: this.request.ip,
+            fileType: 'problem',
+            target,
+            referer: this.request.referer,
+            size: file?.size || 0,
+        });
         if (!file) {
             this.response.redirect = await storage.signDownloadLink(
                 target, noDisposition ? undefined : filename, false, 'user',