feat: direct file link

backend/src/file/guard/fileSecurity.guard.ts

@@ -0,0 +1,65 @@
+import {
+  ExecutionContext,
+  ForbiddenException,
+  Injectable,
+  NotFoundException,
+} from "@nestjs/common";
+import { Request } from "express";
+import * as moment from "moment";
+import { PrismaService } from "src/prisma/prisma.service";
+import { ShareSecurityGuard } from "src/share/guard/shareSecurity.guard";
+import { ShareService } from "src/share/share.service";
+
+@Injectable()
+export class FileSecurityGuard extends ShareSecurityGuard {
+  constructor(
+    private _shareService: ShareService,
+    private _prisma: PrismaService
+  ) {
+    super(_shareService, _prisma);
+  }
+
+  async canActivate(context: ExecutionContext) {
+    const request: Request = context.switchToHttp().getRequest();
+
+    const shareId = Object.prototype.hasOwnProperty.call(
+      request.params,
+      "shareId"
+    )
+      ? request.params.shareId
+      : request.params.id;
+
+    const shareToken = request.cookies[`share_${shareId}_token`];
+
+    const share = await this._prisma.share.findUnique({
+      where: { id: shareId },
+      include: { security: true },
+    });
+
+    // If there is no share token the user requests a file directly
+    if (!shareToken) {
+      if (
+        !share ||
+        (moment().isAfter(share.expiration) &&
+          !moment(share.expiration).isSame(0))
+      ) {
+        throw new NotFoundException("File not found");
+      }
+
+      if (share.security?.password)
+        throw new ForbiddenException("This share is password protected");
+
+      if (share.security?.maxViews && share.security.maxViews <= share.views) {
+        throw new ForbiddenException(
+          "Maximum views exceeded",
+          "share_max_views_exceeded"
+        );
+      }
+
+      await this._shareService.increaseViewCount(share);
+      return true;
+    } else {
+      return super.canActivate(context);
+    }
+  }
+}