feat(backend): QR-Code-System (Modul 22)

QrModule mit GET /qr/:entityType/:id.svg fuer colonies (Deep-Link
direkt zu /inspections/new), apiaries, queens, honey-batches und
storage-containers. Nutzt pdfkit-Nachbar qrcode zur SVG-Erzeugung.

ApiCore-Backend/package-lock.json

@@ -26,6 +26,7 @@
         "passport": "^0.7.0",
         "passport-jwt": "^4.0.1",
         "pdfkit": "^0.19.1",
+        "qrcode": "^1.5.4",
         "reflect-metadata": "^0.2.2",
         "rxjs": "^7.8.1"
       },
@@ -42,6 +43,7 @@
         "@types/node": "^24.0.0",
         "@types/passport-jwt": "^4.0.1",
         "@types/pdfkit": "^0.17.6",
+        "@types/qrcode": "^1.5.6",
         "@types/supertest": "^7.0.0",
         "eslint": "^9.18.0",
         "eslint-config-prettier": "^10.0.1",
@@ -3603,6 +3605,16 @@
         "pg-types": "^2.2.0"
       }
     },
+    "node_modules/@types/qrcode": {
+      "version": "1.5.6",
+      "resolved": "https://registry.npmjs.org/@types/qrcode/-/qrcode-1.5.6.tgz",
+      "integrity": "sha512-te7NQcV2BOvdj2b1hCAHzAoMNuj65kNBMz0KBaxM6c3VGBOhU0dURQKOtH8CFNI/dsKkwlv32p26qYQTWoB5bw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/qs": {
       "version": "6.15.1",
       "resolved": "https://registry.npmjs.org/@types/qs/-/qs-6.15.1.tgz",
@@ -4821,7 +4833,6 @@
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
       "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
-      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=8"
@@ -4831,7 +4842,6 @@
       "version": "4.3.0",
       "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
       "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
-      "dev": true,
       "license": "MIT",
       "dependencies": {
         "color-convert": "^2.0.1"
@@ -5379,7 +5389,6 @@
       "version": "5.3.1",
       "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
       "integrity": "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==",
-      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=6"
@@ -5630,7 +5639,6 @@
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
       "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
-      "dev": true,
       "license": "MIT",
       "dependencies": {
         "color-name": "~1.1.4"
@@ -5643,7 +5651,6 @@
       "version": "1.1.4",
       "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
       "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
-      "dev": true,
       "license": "MIT"
     },
     "node_modules/combined-stream": {
@@ -6023,6 +6030,15 @@
         }
       }
     },
+    "node_modules/decamelize": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
+      "integrity": "sha512-z2S+W9X73hAUUki+N+9Za2lBlun89zigOyGrsax+KUQ6wKW4ZoWpEYBkGhQjwAjjDCkWxhY0VKEhk8wzY7F5cA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/dedent": {
       "version": "1.7.2",
       "resolved": "https://registry.npmjs.org/dedent/-/dedent-1.7.2.tgz",
@@ -6168,6 +6184,12 @@
         "node": ">=0.3.1"
       }
     },
+    "node_modules/dijkstrajs": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/dijkstrajs/-/dijkstrajs-1.0.3.tgz",
+      "integrity": "sha512-qiSlmBq9+BCdCA/L46dw8Uy93mloxsPSbwnm5yrKn2vMPiy8KyAskTF6zuV/j5BMsmOGZDPs7KjU+mjb670kfA==",
+      "license": "MIT"
+    },
     "node_modules/dotenv": {
       "version": "17.4.1",
       "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-17.4.1.tgz",
@@ -6285,7 +6307,6 @@
       "version": "8.0.0",
       "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
       "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
-      "dev": true,
       "license": "MIT"
     },
     "node_modules/empathic": {
@@ -7234,7 +7255,6 @@
       "version": "2.0.5",
       "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
       "integrity": "sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg==",
-      "dev": true,
       "license": "ISC",
       "engines": {
         "node": "6.* || 8.* || >= 10.*"
@@ -7722,7 +7742,6 @@
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz",
       "integrity": "sha512-zymm5+u+sCsSWyD9qNaejV3DFvhCKclKdizYaJUuHA83RLjb7nSuGnddCHGv0hk+KY7BMAlsWeK4Ueg6EV6XQg==",
-      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=8"
@@ -9772,7 +9791,6 @@
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/p-try/-/p-try-2.2.0.tgz",
       "integrity": "sha512-R4nPAVTAU0B9D35/Gk3uJf/7XYbQcyohSKdvAxIRSNghFl4e71hVoGnBNQz9cWaXxO2I10KTC+3jMdvvoKw6dQ==",
-      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=6"
@@ -9872,7 +9890,6 @@
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-4.0.0.tgz",
       "integrity": "sha512-ak9Qy5Q7jYb2Wwcey5Fpvg2KoAc/ZIhLSLOSBmRmygPsGwkVVt0fZa0qrtMz+m6tJTAHfZQ8FnmB4MG4LWy7/w==",
-      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=8"
@@ -10205,6 +10222,15 @@
         "browserify-zlib": "^0.2.0"
       }
     },
+    "node_modules/pngjs": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/pngjs/-/pngjs-5.0.0.tgz",
+      "integrity": "sha512-40QW5YalBNfQo5yRYmiw7Yz6TKKVr3h6970B2YE+3fQpsWcrbj1PzJgxeJ19DRQjhMbKPIuMY8rFaXc8moolVw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10.13.0"
+      }
+    },
     "node_modules/postgres": {
       "version": "3.4.7",
       "resolved": "https://registry.npmjs.org/postgres/-/postgres-3.4.7.tgz",
@@ -10419,6 +10445,127 @@
       ],
       "license": "MIT"
     },
+    "node_modules/qrcode": {
+      "version": "1.5.4",
+      "resolved": "https://registry.npmjs.org/qrcode/-/qrcode-1.5.4.tgz",
+      "integrity": "sha512-1ca71Zgiu6ORjHqFBDpnSMTR2ReToX4l1Au1VFLyVeBTFavzQnv5JxMFr3ukHVKpSrSA2MCk0lNJSykjUfz7Zg==",
+      "license": "MIT",
+      "dependencies": {
+        "dijkstrajs": "^1.0.1",
+        "pngjs": "^5.0.0",
+        "yargs": "^15.3.1"
+      },
+      "bin": {
+        "qrcode": "bin/qrcode"
+      },
+      "engines": {
+        "node": ">=10.13.0"
+      }
+    },
+    "node_modules/qrcode/node_modules/cliui": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-6.0.0.tgz",
+      "integrity": "sha512-t6wbgtoCXvAzst7QgXxJYqPt0usEfbgQdftEPbLL/cvv6HPE5VgvqCuAIDR0NgU52ds6rFwqrgakNLrHEjCbrQ==",
+      "license": "ISC",
+      "dependencies": {
+        "string-width": "^4.2.0",
+        "strip-ansi": "^6.0.0",
+        "wrap-ansi": "^6.2.0"
+      }
+    },
+    "node_modules/qrcode/node_modules/find-up": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/find-up/-/find-up-4.1.0.tgz",
+      "integrity": "sha512-PpOwAdQ/YlXQ2vj8a3h8IipDuYRi3wceVQQGYWxNINccq40Anw7BlsEXCMbt1Zt+OLA6Fq9suIpIWD0OsnISlw==",
+      "license": "MIT",
+      "dependencies": {
+        "locate-path": "^5.0.0",
+        "path-exists": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/qrcode/node_modules/locate-path": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-5.0.0.tgz",
+      "integrity": "sha512-t7hw9pI+WvuwNJXwk5zVHpyhIqzg2qTlklJOf0mVxGSbe3Fp2VieZcduNYjaLDoy6p9uGpQEGWG87WpMKlNq8g==",
+      "license": "MIT",
+      "dependencies": {
+        "p-locate": "^4.1.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/qrcode/node_modules/p-limit": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.3.0.tgz",
+      "integrity": "sha512-//88mFWSJx8lxCzwdAABTJL2MyWB12+eIY7MDL2SqLmAkeKU9qxRvWuSyTjm3FUmpBEMuFfckAIqEaVGUDxb6w==",
+      "license": "MIT",
+      "dependencies": {
+        "p-try": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/qrcode/node_modules/p-locate": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-4.1.0.tgz",
+      "integrity": "sha512-R79ZZ/0wAxKGu3oYMlz8jy/kbhsNrS7SKZ7PxEHBgJ5+F2mtFW2fK2cOtBh1cHYkQsbzFV7I+EoRKe6Yt0oK7A==",
+      "license": "MIT",
+      "dependencies": {
+        "p-limit": "^2.2.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/qrcode/node_modules/y18n": {
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.3.tgz",
+      "integrity": "sha512-JKhqTOwSrqNA1NY5lSztJ1GrBiUodLMmIZuLiDaMRJ+itFd+ABVE8XBjOvIWL+rSqNDC74LCSFmlb/U4UZ4hJQ==",
+      "license": "ISC"
+    },
+    "node_modules/qrcode/node_modules/yargs": {
+      "version": "15.4.1",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-15.4.1.tgz",
+      "integrity": "sha512-aePbxDmcYW++PaqBsJ+HYUFwCdv4LVvdnhBy78E57PIor8/OVvhMrADFFEDh8DHDFRv/O9i3lPhsENjO7QX0+A==",
+      "license": "MIT",
+      "dependencies": {
+        "cliui": "^6.0.0",
+        "decamelize": "^1.2.0",
+        "find-up": "^4.1.0",
+        "get-caller-file": "^2.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^2.0.0",
+        "set-blocking": "^2.0.0",
+        "string-width": "^4.2.0",
+        "which-module": "^2.0.0",
+        "y18n": "^4.0.0",
+        "yargs-parser": "^18.1.2"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/qrcode/node_modules/yargs-parser": {
+      "version": "18.1.3",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-18.1.3.tgz",
+      "integrity": "sha512-o50j0JeToy/4K6OZcaQmW6lyXXKhq7csREXcDwk2omFPJEwUNOVtJKvmDr9EI1fAJZUyZcRF7kxGBWmRXudrCQ==",
+      "license": "ISC",
+      "dependencies": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/qs": {
       "version": "6.15.3",
       "resolved": "https://registry.npmjs.org/qs/-/qs-6.15.3.tgz",
@@ -10563,7 +10710,6 @@
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/require-directory/-/require-directory-2.1.1.tgz",
       "integrity": "sha512-fGxEI7+wsG9xrvdjsrlmL22OMTTiHRwAMroiEeMgq8gzoLC/PQr7RsRDSTLUg/bZAZtF+TVIkHc6/4RIKrui+Q==",
-      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=0.10.0"
@@ -10579,6 +10725,12 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/require-main-filename": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-2.0.0.tgz",
+      "integrity": "sha512-NKN5kMDylKuldxYLSUfrbo5Tuzh4hd+2E8NPPX02mZtn1VuREQToYe/ZdlJy+J3uCpfaiGF05e7B8W0iXbQHmg==",
+      "license": "ISC"
+    },
     "node_modules/resolve-cwd": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/resolve-cwd/-/resolve-cwd-3.0.0.tgz",
@@ -10830,6 +10982,12 @@
         "url": "https://opencollective.com/express"
       }
     },
+    "node_modules/set-blocking": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
+      "integrity": "sha512-KiKBS8AnWGEyLzofFfmvKwpdPzqiy16LvQfK3yv/fVH7Bj13/wl3JSR1J+rfgRE9q7xUJK4qvgS8raSOeLUehw==",
+      "license": "ISC"
+    },
     "node_modules/setprototypeof": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.2.0.tgz",
@@ -11085,7 +11243,6 @@
       "version": "4.2.3",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
       "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
-      "dev": true,
       "license": "MIT",
       "dependencies": {
         "emoji-regex": "^8.0.0",
@@ -11116,7 +11273,6 @@
       "version": "6.0.1",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
       "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
-      "dev": true,
       "license": "MIT",
       "dependencies": {
         "ansi-regex": "^5.0.1"
@@ -12337,6 +12493,12 @@
         "node": ">= 8"
       }
     },
+    "node_modules/which-module": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.1.tgz",
+      "integrity": "sha512-iBdZ57RDvnOR9AGBhML2vFZf7h8vmBjhoaZqODJBFWHVtKkDmKuHai3cx5PgVMrX5YDNp27AofYbAwctSS+vhQ==",
+      "license": "ISC"
+    },
     "node_modules/word-wrap": {
       "version": "1.2.5",
       "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
@@ -12358,7 +12520,6 @@
       "version": "6.2.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-6.2.0.tgz",
       "integrity": "sha512-r6lPcBGxZXlIcymEu7InxDMhdW0KDxpLgoFLcguasxCaJ/SOIZwINatK9KY/tf+ZrlywOKU0UDj3ATXUBfxJXA==",
-      "dev": true,
       "license": "MIT",
       "dependencies": {
         "ansi-styles": "^4.0.0",

ApiCore-Backend/package.json

@@ -38,6 +38,7 @@
     "passport": "^0.7.0",
     "passport-jwt": "^4.0.1",
     "pdfkit": "^0.19.1",
+    "qrcode": "^1.5.4",
     "reflect-metadata": "^0.2.2",
     "rxjs": "^7.8.1"
   },
@@ -54,6 +55,7 @@
     "@types/node": "^24.0.0",
     "@types/passport-jwt": "^4.0.1",
     "@types/pdfkit": "^0.17.6",
+    "@types/qrcode": "^1.5.6",
     "@types/supertest": "^7.0.0",
     "eslint": "^9.18.0",
     "eslint-config-prettier": "^10.0.1",

ApiCore-Backend/src/app.module.ts

@@ -21,6 +21,7 @@ import { StorageModule } from './storage/storage.module';
 import { DashboardModule } from './dashboard/dashboard.module';
 import { SearchModule } from './search/search.module';
 import { ExportModule } from './export/export.module';
+import { QrModule } from './qr/qr.module';
 import { JwtAuthGuard } from './auth/guards/jwt-auth.guard';
 import { RolesGuard } from './auth/guards/roles.guard';
 
@@ -47,6 +48,7 @@ import { RolesGuard } from './auth/guards/roles.guard';
     DashboardModule,
     SearchModule,
     ExportModule,
+    QrModule,
   ],
   controllers: [],
   providers: [

ApiCore-Backend/src/qr/qr.controller.ts

@@ -0,0 +1,22 @@
+import { Controller, Get, Param, Res } from '@nestjs/common';
+import { ApiBearerAuth, ApiTags } from '@nestjs/swagger';
+import type { Response } from 'express';
+import { QrService } from './qr.service';
+
+@ApiTags('qr')
+@ApiBearerAuth()
+@Controller('qr')
+export class QrController {
+  constructor(private readonly qrService: QrService) {}
+
+  @Get(':entityType/:id.svg')
+  async svg(
+    @Param('entityType') entityType: string,
+    @Param('id') id: string,
+    @Res() res: Response,
+  ): Promise<void> {
+    const svg = await this.qrService.generateSvg(entityType, id);
+    res.setHeader('Content-Type', 'image/svg+xml');
+    res.send(svg);
+  }
+}

ApiCore-Backend/src/qr/qr.module.ts

@@ -0,0 +1,9 @@
+import { Module } from '@nestjs/common';
+import { QrController } from './qr.controller';
+import { QrService } from './qr.service';
+
+@Module({
+  controllers: [QrController],
+  providers: [QrService],
+})
+export class QrModule {}

ApiCore-Backend/src/qr/qr.service.spec.ts

@@ -0,0 +1,50 @@
+import { BadRequestException, NotFoundException } from '@nestjs/common';
+import { QrService } from './qr.service';
+import { PrismaService } from '../prisma/prisma.service';
+
+describe('QrService', () => {
+  let service: QrService;
+  let prisma: {
+    colony: { findUnique: jest.Mock };
+    apiary: { findUnique: jest.Mock };
+    queen: { findUnique: jest.Mock };
+    honeyBatch: { findUnique: jest.Mock };
+    storageContainer: { findUnique: jest.Mock };
+  };
+
+  beforeEach(() => {
+    prisma = {
+      colony: { findUnique: jest.fn() },
+      apiary: { findUnique: jest.fn() },
+      queen: { findUnique: jest.fn() },
+      honeyBatch: { findUnique: jest.fn() },
+      storageContainer: { findUnique: jest.fn() },
+    };
+    service = new QrService(prisma as unknown as PrismaService);
+  });
+
+  it('rejects an unsupported entity type', async () => {
+    await expect(service.generateSvg('unknown', 'id-1')).rejects.toBeInstanceOf(
+      BadRequestException,
+    );
+  });
+
+  it('throws NotFoundException when the object does not exist', async () => {
+    prisma.colony.findUnique.mockResolvedValueOnce(null);
+    await expect(
+      service.generateSvg('colonies', 'missing'),
+    ).rejects.toBeInstanceOf(NotFoundException);
+  });
+
+  it('generates an SVG QR code for an existing colony', async () => {
+    prisma.colony.findUnique.mockResolvedValueOnce({ id: 'colony-1' });
+    const svg = await service.generateSvg('colonies', 'colony-1');
+    expect(svg).toContain('<svg');
+  });
+
+  it('generates an SVG QR code for an existing storage container', async () => {
+    prisma.storageContainer.findUnique.mockResolvedValueOnce({ id: 'sc-1' });
+    const svg = await service.generateSvg('storage-containers', 'sc-1');
+    expect(svg).toContain('<svg');
+  });
+});

ApiCore-Backend/src/qr/qr.service.ts

@@ -0,0 +1,85 @@
+import {
+  Injectable,
+  BadRequestException,
+  NotFoundException,
+} from '@nestjs/common';
+import * as QRCode from 'qrcode';
+import { PrismaService } from '../prisma/prisma.service';
+
+const ENTITY_TYPES = [
+  'colonies',
+  'apiaries',
+  'queens',
+  'honey-batches',
+  'storage-containers',
+] as const;
+type EntityType = (typeof ENTITY_TYPES)[number];
+
+function isEntityType(value: string): value is EntityType {
+  return (ENTITY_TYPES as readonly string[]).includes(value);
+}
+
+@Injectable()
+export class QrService {
+  constructor(private readonly prisma: PrismaService) {}
+
+  async generateSvg(entityType: string, id: string): Promise<string> {
+    if (!isEntityType(entityType)) {
+      throw new BadRequestException(
+        `Unsupported QR entity type: ${entityType}`,
+      );
+    }
+
+    const exists = await this.entityExists(entityType, id);
+    if (!exists) {
+      throw new NotFoundException('Object not found');
+    }
+
+    const frontendOrigin =
+      process.env.FRONTEND_ORIGIN ?? 'http://localhost:3000';
+    const url = `${frontendOrigin}${this.deepLink(entityType, id)}`;
+    return QRCode.toString(url, { type: 'svg', margin: 1, width: 256 });
+  }
+
+  private async entityExists(
+    entityType: EntityType,
+    id: string,
+  ): Promise<boolean> {
+    switch (entityType) {
+      case 'colonies':
+        return (
+          (await this.prisma.colony.findUnique({ where: { id } })) !== null
+        );
+      case 'apiaries':
+        return (
+          (await this.prisma.apiary.findUnique({ where: { id } })) !== null
+        );
+      case 'queens':
+        return (await this.prisma.queen.findUnique({ where: { id } })) !== null;
+      case 'honey-batches':
+        return (
+          (await this.prisma.honeyBatch.findUnique({ where: { id } })) !== null
+        );
+      case 'storage-containers':
+        return (
+          (await this.prisma.storageContainer.findUnique({ where: { id } })) !==
+          null
+        );
+    }
+  }
+
+  private deepLink(entityType: EntityType, id: string): string {
+    switch (entityType) {
+      case 'colonies':
+        return `/inspections/new?colonyId=${id}`;
+      case 'apiaries':
+        return `/apiaries/${id}`;
+      case 'queens':
+        return `/queens/${id}`;
+      case 'honey-batches':
+        return `/honey-batches/${id}`;
+      case 'storage-containers':
+        return `/storage`;
+    }
+  }
+}

ApiCore-Backend/test/qr.e2e-spec.ts

@@ -0,0 +1,81 @@
+import { INestApplication } from '@nestjs/common';
+import * as bcrypt from 'bcryptjs';
+import request from 'supertest';
+import { App } from 'supertest/types';
+import { PrismaService } from '../src/prisma/prisma.service';
+import { createTestApp } from './utils/create-test-app';
+import { login } from './utils/api';
+
+describe('QR codes (e2e)', () => {
+  let app: INestApplication<App>;
+  let prisma: PrismaService;
+  const beekeeperEmail = `qr-e2e-beekeeper-${Date.now()}@example.com`;
+  const password = 'SuperSecret123!';
+  let beekeeperId: string;
+  let beekeeperToken: string;
+  let apiaryId: string;
+  let colonyId: string;
+
+  beforeAll(async () => {
+    app = await createTestApp();
+    prisma = app.get(PrismaService);
+
+    const passwordHash = await bcrypt.hash(password, 12);
+    const beekeeper = await prisma.user.create({
+      data: {
+        email: beekeeperEmail,
+        passwordHash,
+        name: 'Beekeeper',
+        role: 'BEEKEEPER',
+      },
+    });
+    beekeeperId = beekeeper.id;
+    beekeeperToken = (await login(app, beekeeperEmail, password)).accessToken;
+
+    const apiary = await prisma.apiary.create({
+      data: { name: `Stand ${Date.now()}` },
+    });
+    apiaryId = apiary.id;
+    const colony = await prisma.colony.create({
+      data: {
+        code: `V-${Date.now()}`,
+        apiaryId,
+        colonyType: 'PRODUCTION_COLONY',
+      },
+    });
+    colonyId = colony.id;
+  });
+
+  afterAll(async () => {
+    await prisma.colony.deleteMany({ where: { id: colonyId } });
+    await prisma.apiary.deleteMany({ where: { id: apiaryId } });
+    await prisma.refreshToken.deleteMany({ where: { userId: beekeeperId } });
+    await prisma.auditLog.deleteMany({ where: { userId: beekeeperId } });
+    await prisma.user.deleteMany({ where: { id: beekeeperId } });
+    await app.close();
+  });
+
+  it('returns an SVG QR code for an existing colony', async () => {
+    const response = await request(app.getHttpServer())
+      .get(`/api/v1/qr/colonies/${colonyId}.svg`)
+      .set('Authorization', `Bearer ${beekeeperToken}`)
+      .expect(200);
+    expect(response.headers['content-type']).toContain('image/svg+xml');
+    const svgBody = response.body as Buffer;
+    expect(svgBody.toString('utf-8')).toContain('<svg');
+  });
+
+  it('returns 404 for a colony that does not exist', () => {
+    return request(app.getHttpServer())
+      .get('/api/v1/qr/colonies/does-not-exist.svg')
+      .set('Authorization', `Bearer ${beekeeperToken}`)
+      .expect(404);
+  });
+
+  it('returns 400 for an unsupported entity type', () => {
+    return request(app.getHttpServer())
+      .get(`/api/v1/qr/unknown/${colonyId}.svg`)
+      .set('Authorization', `Bearer ${beekeeperToken}`)
+      .expect(400);
+  });
+});

TASKS.md

@@ -179,7 +179,7 @@ Reihenfolge = Bau-Reihenfolge. Gleiche Haken-Regel wie MVP: erst setzen, wenn Li
 - Backend: `QrModule` – erzeugt QR-Code (PNG/SVG) pro Objekt, kodiert Deep-Link (`/colonies/:id`, bei Volk direkt `/inspections/new?colonyId=:id` gemäß Lastenheft-Begründung "reduziert Auswahlaufwand")
 - Endpunkte: `GET /api/v1/qr/:entityType/:id.svg` für `entityType` ∈ `colonies|apiaries|queens|honey-batches|storage-containers`
 - Frontend: "QR-Code"-Button/Dialog auf den jeweiligen Detailseiten, druckfreundliche Ansicht
-- [ ] Backend-Modul fertig, getestet, grün, committet
+- [x] Backend-Modul fertig, getestet, grün, committet
 - [ ] Frontend-Views fertig, getestet, grün, committet
 
 ### 23. Abfüllungen und Produkte