fix: enforce quota for comment attachments (#15149)

## Summary

This change includes comment attachments in workspace storage usage and
checks workspace storage quota before accepting a new comment attachment
upload.

## Impact

Comment attachments already had a per-file size limit, but they were not
counted in the same workspace storage usage path as other uploaded
blobs. A user with comment permission could keep adding attachments
without those bytes participating in workspace storage quota
calculations.

## Fix

- Count comment attachment bytes in workspace storage usage
reconciliation.
- Check the workspace quota before storing a new comment attachment.
- Return the existing comment attachment quota error when the upload
would exceed limits.

## Validation

- `git diff --check`
- Full test/lint suite was not run locally because dependencies are not
installed in this checkout.


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **New Features**
* Workspace attachment uploads now respect storage and file quota limits
more accurately.
* Workspace storage tracking now includes comment attachments, improving
quota enforcement.

* **Bug Fixes**
* Attachment uploads now fail with a clear quota error when a workspace
is out of space or blob capacity.
* Storage usage calculations now better reflect actual workspace
content, including non-deleted files.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Signed-off-by: failsafesecurity <190101117+failsafesecurity@users.noreply.github.com>

packages/backend/server/src/core/comment/index.ts

@@ -2,6 +2,7 @@ import { Module } from '@nestjs/common';
 
 import { ServerConfigModule } from '../config';
 import { PermissionModule } from '../permission';
+import { QuotaServiceModule } from '../quota';
 import { StorageModule } from '../storage';
 import { CommentRealtimeModule } from './realtime.module';
 import { CommentResolver } from './resolver';
@@ -9,6 +10,7 @@ import { CommentResolver } from './resolver';
 @Module({
   imports: [
     PermissionModule,
+    QuotaServiceModule,
     StorageModule,
     ServerConfigModule,
     CommentRealtimeModule,

packages/backend/server/src/core/comment/resolver.ts

@@ -26,6 +26,7 @@ import { Comment, DocMode, Models, Reply } from '../../models';
 import { CurrentUser } from '../auth/session';
 import { ServerFeature, ServerService } from '../config';
 import { DocAction, PermissionAccess } from '../permission';
+import { QuotaService } from '../quota';
 import { RealtimePublisher } from '../realtime';
 import { CommentAttachmentStorage } from '../storage';
 import { UserType } from '../user';
@@ -56,6 +57,7 @@ export class CommentResolver {
     private readonly service: CommentService,
     private readonly ac: PermissionAccess,
     private readonly commentAttachmentStorage: CommentAttachmentStorage,
+    private readonly quota: QuotaService,
     private readonly queue: JobQueue,
     private readonly models: Models,
     private readonly server: ServerService,
@@ -354,13 +356,19 @@ export class CommentResolver {
       'Doc.Comments.Create'
     );
 
-    // TODO(@fengmk2): should check total attachment quota in the future version
     const buffer = await readableToBuffer(attachment.createReadStream());
     // max attachment size is 10MB
     if (buffer.length > 10 * 1024 * 1024) {
       throw new CommentAttachmentQuotaExceeded();
     }
 
+    const checkExceeded =
+      await this.quota.getWorkspaceQuotaCalculator(workspaceId);
+    const result = checkExceeded(buffer.length);
+    if (result?.blobQuotaExceeded || result?.storageQuotaExceeded) {
+      throw new CommentAttachmentQuotaExceeded();
+    }
+
     const key = randomUUID();
     await this.commentAttachmentStorage.put(
       workspaceId,

packages/backend/server/src/core/quota/state.ts

@@ -287,17 +287,30 @@ export class QuotaStateService {
   }
 
   private async getWorkspaceStorageUsage(workspaceId: string) {
-    const sum = await this.db.blob.aggregate({
-      where: {
-        workspaceId,
-        deletedAt: null,
-      },
-      _sum: {
-        size: true,
-      },
-    });
+    const [blobSum, commentAttachmentSum] = await Promise.all([
+      this.db.blob.aggregate({
+        where: {
+          workspaceId,
+          deletedAt: null,
+        },
+        _sum: {
+          size: true,
+        },
+      }),
+      this.db.commentAttachment.aggregate({
+        where: {
+          workspaceId,
+        },
+        _sum: {
+          size: true,
+        },
+      }),
+    ]);
 
-    return BigInt(sum._sum.size ?? 0);
+    return (
+      BigInt(blobSum._sum.size ?? 0) +
+      BigInt(commentAttachmentSum._sum.size ?? 0)
+    );
   }
 
   private hasStandaloneWorkspaceQuota(plan: string) {