feat: add cashbox export download endpoint

myteamwallet_backend/src/cashbox-export/cashbox-export.controller.ts

@@ -0,0 +1,45 @@
+import {
+  Controller,
+  Get,
+  Param,
+  ParseIntPipe,
+  Query,
+  Request,
+  Res,
+  UseGuards,
+} from '@nestjs/common';
+import { AuthGuard } from '@nestjs/passport';
+import { ApiBearerAuth } from '@nestjs/swagger';
+import type { Response } from 'express';
+import { CashboxExportQueryDto } from './dto/cashbox-export-query.dto';
+import { CashboxExportService } from './cashbox-export.service';
+
+type AuthenticatedRequest = { user: { id: number } };
+
+@ApiBearerAuth()
+@UseGuards(AuthGuard('jwt'))
+@Controller({ path: 'cashbox-export', version: '1' })
+export class CashboxExportController {
+  constructor(private readonly service: CashboxExportService) {}
+
+  @Get(':teamId')
+  async exportCashbox(
+    @Request() request: AuthenticatedRequest,
+    @Param('teamId', ParseIntPipe) teamId: number,
+    @Query() query: CashboxExportQueryDto,
+    @Res({ passthrough: false }) res: Response,
+  ): Promise<void> {
+    const { buffer, contentType, filename } = await this.service.exportForUser(
+      teamId,
+      request.user.id,
+      query.from,
+      query.to,
+      query.format,
+    );
+    res.set({
+      'Content-Type': contentType,
+      'Content-Disposition': `attachment; filename="${filename}"`,
+    });
+    res.send(buffer);
+  }
+}

myteamwallet_backend/src/cashbox-export/cashbox-export.http.spec.ts

@@ -0,0 +1,98 @@
+import {
+  INestApplication,
+  UnauthorizedException,
+  ValidationPipe,
+  VersioningType,
+} from '@nestjs/common';
+import { AuthGuard } from '@nestjs/passport';
+import { Test } from '@nestjs/testing';
+import * as request from 'supertest';
+import validationOptions from '../utils/validation-options';
+import { CashboxExportController } from './cashbox-export.controller';
+import { CashboxExportService } from './cashbox-export.service';
+
+describe('cashbox export HTTP boundary', () => {
+  let app: INestApplication;
+  const service = {
+    exportForUser: jest.fn(),
+  };
+
+  beforeAll(async () => {
+    const module = await Test.createTestingModule({
+      controllers: [CashboxExportController],
+      providers: [{ provide: CashboxExportService, useValue: service }],
+    })
+      .overrideGuard(AuthGuard('jwt'))
+      .useValue({
+        canActivate(context) {
+          const httpRequest = context.switchToHttp().getRequest();
+          if (httpRequest.headers.authorization !== 'Bearer user') {
+            throw new UnauthorizedException();
+          }
+          httpRequest.user = { id: 42, role: { id: 2 } };
+          return true;
+        },
+      })
+      .compile();
+    app = module.createNestApplication();
+    app.setGlobalPrefix('api');
+    app.enableVersioning({ type: VersioningType.URI });
+    app.useGlobalPipes(new ValidationPipe(validationOptions));
+    await app.init();
+  });
+
+  afterAll(() => app.close());
+  beforeEach(() => jest.clearAllMocks());
+
+  it('requires authentication', async () => {
+    await request(app.getHttpServer())
+      .get('/api/v1/cashbox-export/5?from=2026-08-01&to=2026-08-31&format=csv')
+      .expect(401);
+  });
+
+  it('rejects an invalid format', async () => {
+    await request(app.getHttpServer())
+      .get('/api/v1/cashbox-export/5?from=2026-08-01&to=2026-08-31&format=xls')
+      .set('Authorization', 'Bearer user')
+      .expect(422);
+    expect(service.exportForUser).not.toHaveBeenCalled();
+  });
+
+  it('returns a CSV file with correct headers and content', async () => {
+    const csvBuffer = Buffer.from('Datum;Typ;Wer;Notiz;Betrag;Periodensaldo', 'utf-8');
+    service.exportForUser.mockResolvedValue({
+      buffer: csvBuffer,
+      contentType: 'text/csv; charset=utf-8',
+      filename: 'kassenbuch_team-a_2026-08-01_2026-08-31.csv',
+    });
+
+    const response = await request(app.getHttpServer())
+      .get('/api/v1/cashbox-export/5?from=2026-08-01&to=2026-08-31&format=csv')
+      .set('Authorization', 'Bearer user')
+      .expect(200);
+
+    expect(response.headers['content-type']).toContain('text/csv');
+    expect(response.headers['content-disposition']).toContain(
+      'kassenbuch_team-a_2026-08-01_2026-08-31.csv',
+    );
+    expect(response.text).toBe(csvBuffer.toString('utf-8'));
+    expect(service.exportForUser).toHaveBeenCalledWith(5, 42, '2026-08-01', '2026-08-31', 'csv');
+  });
+
+  it('returns a PDF file with correct headers and binary content', async () => {
+    const pdfBuffer = Buffer.from('%PDF-1.4 fake content');
+    service.exportForUser.mockResolvedValue({
+      buffer: pdfBuffer,
+      contentType: 'application/pdf',
+      filename: 'kassenbuch_team-a_2026-08-01_2026-08-31.pdf',
+    });
+
+    const response = await request(app.getHttpServer())
+      .get('/api/v1/cashbox-export/5?from=2026-08-01&to=2026-08-31&format=pdf')
+      .set('Authorization', 'Bearer user')
+      .expect(200);
+
+    expect(response.headers['content-type']).toBe('application/pdf');
+    expect(Buffer.from(response.body).equals(pdfBuffer)).toBe(true);
+  });
+});