从Angular向Azure存储Blob添加文件

Question

我想知道如何使用ngx awesome uploader将图像从Angular上传到azure storage blob。

我希望能够使用此库将其直接从angular发送到azure存储blob。我已经能够将它发送到我的nodejs后端没有问题，但是直接将它发送到blob存储对我来说是一个挑战。有人能提供一个如何做到这一点的工作示例吗？谢谢你的帮助！

选择stackblitz中的简单演示。不是高级演示

ngx真棒上传器的stackblitz示例

该文件将传递给此。（以下是控制台输出代码）

import { FilePreviewModel } from 'ngx-awesome-uploader';
import { HttpRequest, HttpClient, HttpEvent, HttpEventType } from '@angular/common/http';
import { map } from 'rxjs/operators';
import { Observable } from 'rxjs';
import { FilePickerAdapter } from 'ngx-awesome-uploader';

export class DemoFilePickerAdapter extends FilePickerAdapter {
  constructor(private http: HttpClient) {
    super();
  }
  public uploadFile(fileItem: FilePreviewModel) {
    const form = new FormData();
    form.append('file', fileItem.file);

   console.log("FILE OUTPUT");
    console.log(fileItem.file);


//need to replace everything below with code to add to storage blob

    const api = 'https://demo-file-uploader.free.beeceptor.com';
    const req = new HttpRequest('POST', api, form, {reportProgress: true});
    return this.http.request(req)
    .pipe(
      map( (res: HttpEvent<any>) => {
          if (res.type === HttpEventType.Response) {
          return res.body.id.toString();
        } else if (res.type ===  HttpEventType.UploadProgress) {
            // Compute and show the % done:
            const UploadProgress = +Math.round((100 * res.loaded) / res.total);
            return UploadProgress;
        }
      })
      );
  }

}

控制台。文件输出的输出是

Answer 1

根据我的测试，如果你想上传文件到Azure blob，请参考以下步骤

1. 安装Azure存储SDk

npm install @azure/storage-blob

<div class="form-group">
  <label for="file">Choose File</label>
  <input type="file"
         id="file"
         (change)="onFileChange($event)">
</div>

export const environment = {
  production: false,
  accountName : "<account name>",
  containerName:"",
   key:""
};

(window as any).global = window;
(window as any).process = require( 'process' );
(window as any).Buffer = require( 'buffer' ).Buffer;

import { Component } from '@angular/core';
import {BlobServiceClient,AnonymousCredential,newPipeline } from '@azure/storage-blob';
import { environment } from './../environments/environment';
@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'web1';
  currentFile : File =null;
  onFileChange(event) {
    this.currentFile = event.target.files[0];
   console.log(this.currentFile.name)
    console.log(this.currentFile.type)
// generate account sas token
  const accountName =environment.accountName;
  const key=environment.key;
  const start = new Date(new Date().getTime() - (15 * 60 * 1000));
  const end = new Date(new Date().getTime() + (30 * 60 * 1000));
const signedpermissions = 'rwdlac';
  const signedservice = 'b';
  const signedresourcetype = 'sco';
  const signedexpiry = end.toISOString().substring(0, end.toISOString().lastIndexOf('.')) + 'Z';
  const signedProtocol = 'https';
  const signedversion = '2018-03-28';

  const StringToSign =
      accountName+ '\n' +
      signedpermissions + '\n' +
      signedservice + '\n' +
      signedresourcetype + '\n' +
       '\n' +
      signedexpiry + '\n' +
       '\n' +
      signedProtocol + '\n' +
signedversion + '\n';
  const crypto =require('crypto')
   const sig = crypto.createHmac('sha256', Buffer.from(key, 'base64')).update(StringToSign, 'utf8').digest('base64');
  const sasToken =`sv=${(signedversion)}&ss=${(signedservice)}&srt=${(signedresourcetype)}&sp=${(signedpermissions)}&se=${encodeURIComponent(signedexpiry)}&spr=${(signedProtocol)}&sig=${encodeURIComponent(sig)}`;
  const containerName=environment.containerName;
  
            const pipeline =newPipeline (new AnonymousCredential(),{
            retryOptions: { maxTries: 4 }, // Retry options
            userAgentOptions: { userAgentPrefix: "AdvancedSample V1.0.0" }, // Customized telemetry string
            keepAliveOptions: {
                // Keep alive is enabled by default, disable keep alive by setting false
                enable: false
            }
            });
   
            const blobServiceClient =new BlobServiceClient(`https://${accountname}.blob.core.windows.net?${sasToken}`,
                                                             pipeline  )
            const containerClient =blobServiceClient.getContainerClient(containerName)
            if(!containerClient.exists()){
            console.log("the container does not exit")
            await containerClient.create()

            }
            const client = containerClient.getBlockBlobClient(this.currentFile.name)
           const response = await client.uploadBrowserData(this.currentFile,{
                  blockSize: 4 * 1024 * 1024, // 4MB block size
                  concurrency: 20, // 20 concurrency
                  onProgress: (ev) => console.log(ev),
                  blobHTTPHeaders :{blobContentType:this.currentFile.type}
                  })
    console.log(response._response.status)
 }
}

Allowed origins: *
Allowed verbs: DELETE,GET,HEAD,MERGE,POST,OPTIONS,PUT
Allowed headers: *
Exposed headers: *
Maximum age (seconds): 86400

关于如何配置CORS，请参考以下步骤

>

选择您使用的Azure帐户

配置CORS

如果无法使用函数createHmac，可以尝试使用crypto js。具体步骤如下

1. 安装sdk

npm install crypto-js --save
npm install @types/crypto-js --save-dev

...
import * as CryptoJS from 'crypto-js';


...
export class AppComponent {
  title = 'web1';
  currentFile : File =null;
  onFileChange(event) {
    this.currentFile = event.target.files[0];
   console.log(this.currentFile.name)
    console.log(this.currentFile.type)
// generate account sas token
  const accountName =environment.accountName;
  const key=environment.key;
  const start = new Date(new Date().getTime() - (15 * 60 * 1000));
  const end = new Date(new Date().getTime() + (30 * 60 * 1000));
const signedpermissions = 'rwdlac';
  const signedservice = 'b';
  const signedresourcetype = 'sco';
  const signedexpiry = end.toISOString().substring(0, end.toISOString().lastIndexOf('.')) + 'Z';
  const signedProtocol = 'https';
  const signedversion = '2018-03-28';

  const StringToSign =
      accountName+ '\n' +
      signedpermissions + '\n' +
      signedservice + '\n' +
      signedresourcetype + '\n' +
       '\n' +
      signedexpiry + '\n' +
       '\n' +
      signedProtocol + '\n' +
signedversion + '\n';

 var str =CryptoJS.HmacSHA256(StringToSign,CryptoJS.enc.Base64.parse(key));
 var sig = CryptoJS.enc.Base64.stringify(str);
 
 
  const sasToken =`sv=${(signedversion)}&ss=${(signedservice)}&srt=${(signedresourcetype)}&sp=${(signedpermissions)}&se=${encodeURIComponent(signedexpiry)}&spr=${(signedProtocol)}&sig=${encodeURIComponent(sig)}`;
  const containerName=environment.containerName;

            const pipeline =newPipeline (new AnonymousCredential(),{
            retryOptions: { maxTries: 4 }, // Retry options
            userAgentOptions: { userAgentPrefix: "AdvancedSample V1.0.0" }, // Customized telemetry string
            keepAliveOptions: {
                // Keep alive is enabled by default, disable keep alive by setting false
                enable: false
            }
            });

            const blobServiceClient =new BlobServiceClient(`https://${accountname}.blob.core.windows.net?${sasToken}`,
                                                             pipeline  )
            const containerClient =blobServiceClient.getContainerClient(containerName)
            if(!containerClient.exists()){
            console.log("the container does not exit")
            await containerClient.create()

            }
            const client = containerClient.getBlockBlobClient(this.currentFile.name)
           const response = await client.uploadBrowserData(this.currentFile,{
                  blockSize: 4 * 1024 * 1024, // 4MB block size
                  concurrency: 20, // 20 concurrency
                  onProgress: (ev) => console.log(ev),
                  blobHTTPHeaders :{blobContentType:this.currentFile.type}
                  })
    console.log(response._response.status)
 }
}