PDF Download

api/src/shared/storage/services/pdf/pdf.service.ts

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+import { HttpService } from '@nestjs/axios';
+import { Injectable } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+import { AxiosResponse } from 'axios';
+import { firstValueFrom } from 'rxjs';
+import { KeyHandoverPDFDataDto } from 'src/model/dto/key-handover.dto';
+import { KeyHandoutRepository } from 'src/model/repositories/key-handout.repository';
+
+@Injectable()
+export class PdfService {
+
+  private readonly STORAGESERVER = this.configService.get('STORAGE_HOST')
+
+  constructor(
+    private readonly configService: ConfigService,
+    private readonly httpService: HttpService,
+    private readonly handoverRepo: KeyHandoutRepository
+  ) {  }
+
+  public async generatePDF(dto: KeyHandoverPDFDataDto): Promise<{ pdf: Buffer, response: AxiosResponse}> {
+    const h = await this.handoverRepo.findOneByOrFail({ id: dto.handoverId });
+    const response = await this.post(`${this.STORAGESERVER}/pdf/keyhandover`, dto);
+    console.log(response)
+    if (response?.data == null) { return; }
+    h.pdfFormKey = response.data;
+    await this.handoverRepo.save(h);
+    return this.getPDFByHandoverKey(response.data)
+    
+  }
+
+  public async getPDFByHandoverKey(key: string): Promise<{ pdf: Buffer, response: AxiosResponse}> {
+    return new Promise(resolve => {
+      this.httpService.get(`${this.STORAGESERVER}/pdf/keyhandover/${key}`, {
+      responseType: 'arraybuffer',
+      }).subscribe({
+        next: pdf => {
+          const pdfBuffer = Buffer.from(pdf.data);
+          resolve({ pdf: pdfBuffer, response: pdf})
+        },
+        error: e => console.log(e)
+      })
+    })
+  }
+
+  private async post(url: string, data: any): Promise<AxiosResponse> {
+    return new Promise(resolve => {
+      this.httpService.post(url, data).subscribe({
+        next: data => resolve(data)
+      })
+    })
+  }
+}