Feature/59 add tracks to log form (#70)

* adding tracks

* adding tracks

* adding tracks

api/src/file/file.service.ts

@@ -0,0 +1,44 @@
+import { BlobServiceClient, BlockBlobClient } from '@azure/storage-blob';
+import { Injectable } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+
+@Injectable() export class FileService {
+  constructor(private readonly configService: ConfigService) {}
+
+  private containerName: string;
+
+  async getBlobServiceInstance() {
+    const connectionString = this.configService.get<string>('azureStorageConnectionString');
+    const blobServiceClient: BlobServiceClient = await BlobServiceClient.fromConnectionString(connectionString)
+
+    return blobServiceClient;
+  }
+
+  async getBlobClient(fileName: string): Promise<BlockBlobClient> {
+    const blobService = await this.getBlobServiceInstance();
+    const containerName = this.containerName;
+    const containerClient = blobService.getContainerClient(containerName);
+    const blockBlobClient = containerClient.getBlockBlobClient(fileName);
+
+    return blockBlobClient;
+  }
+
+  async uploadFile(file: Express.Multer.File, containerName: string, rowKey: string) {
+    this.containerName = containerName;
+
+    const blockBlobClient = await this.getBlobClient(`${rowKey}/${file.originalname}`);
+    const fileUrl = blockBlobClient.url;
+    
+    await blockBlobClient.uploadData(file.buffer);
+
+    return fileUrl;
+  }
+
+  async deleteFile(containerName: string, rowKey:string, fileName: string) {
+      this.containerName = containerName;
+
+      const blockBlobClient = await this.getBlobClient(`${rowKey}/${fileName}`);
+
+      await blockBlobClient.deleteIfExists();
+  }
+}