Add GET /i/:id/:secret hotlink image decrypt stream.

backend/src/modules/upload/controllers/HotlinkImageController.ts

@@ -0,0 +1,15 @@
+import { Controller, Get, Param, StreamableFile } from '@nestjs/common';
+import { HotlinkImageParamsDto } from '../dto/HotlinkImageParamsDto';
+import { UploadService } from '../services/UploadService';
+
+@Controller('i')
+export class HotlinkImageController {
+    constructor(private readonly uploadService: UploadService) {}
+
+    @Get(':id/:secret')
+    async getImage(@Param() params: HotlinkImageParamsDto): Promise<StreamableFile> {
+        const { body, mimeType } = await this.uploadService.getHotlinkImage(params.id, params.secret);
+
+        return new StreamableFile(body, { type: mimeType });
+    }
+}