如何使用node.js中的mailgun服务从firebase存储发送附加文件并将其发送到电子邮件

是否可以从firebase存储中附加文件？？ 我尝试了下面的代码，但不起作用

var mailgun = require("mailgun-js");
var api_key = 'key-acf9f881e32c85b3c0dad34358507a95';
var DOMAIN = 'sandbox76c6f74ddab14862816390c16f37a272.mailgun.org';
var mailgun = require('mailgun-js')({apiKey: api_key, domain: DOMAIN});
var path = require("path");

var filepath = path.join(`gs://i-m-here-c01f6.appspot.com/Groups/${leaderId}`, 'group_image.jpg');


var data = {
    from: 'Excited User <postmaster@sandbox76c6f74ddab14862816390c16f37a272.mailgun.org>',
    to: 'rayteamstudio@gmail.com',
    subject: 'Complex',
    text: 'Group Creation Request',
    html: `<p>A user named: ${fromName} wants to create a group.<br />
            User ID: ${leaderId}<br />
            Group Name: ${groupName}<br />
            Group Description: ${groupDescription}<br /><br />
            To Accept the request click here:<br />
            https://us-central1-i-m-here-c01f6.cloudfunctions.net/acceptOrDenyGroupCreation?leaderID=${leaderId}&requestStatus=approved <br /><br />
            To Deny the request click here:<br />
            https://us-central1-i-m-here-c01f6.cloudfunctions.net/acceptOrDenyGroupCreation?leaderID=${leaderId}&requestStatus=denied /></p>`,
    attachment: filepath
};

mailgun.messages().send(data, function (error, body) {
    if(error)
        console.log('email err: ',error);
});

var mailgun=require（“mailgun js”）；
变量api_key='key-ACF9F881E32C85B3C0DAD3358507A95'；
变量域='sandbox76c6f74ddab14862816390c16f37a272.mailgun.org'；
var mailgun=require（'mailgun-js'）（{apiKey:api_-key，domain:domain}）；
var路径=要求（“路径”）；
var filepath=path.join（`gs://i-m-here-c01f6.appspot.com/Groups/${leaderId}`，'group_image.jpg'）；
风险值数据={
发件人：'兴奋用户'，
致：'rayteamstudio@gmail.com',
主题:"复杂",，
文本：“组创建请求”，
html:`名为：${fromName}的用户想要创建一个组。

用户ID:${leaderId}

组名：${groupName}

组描述：${groupDescription}


要接受请求，请单击此处：

https://us-central1-i-m-here-c01f6.cloudfunctions.net/acceptOrDenyGroupCreation?leaderID=${leaderId}&requestStatus=已批准


要拒绝请求，请单击此处：

https://us-central1-i-m-here-c01f6.cloudfunctions.net/acceptOrDenyGroupCreation?leaderID=${leaderId}&requestStatus=denied/>
`，
附件：文件路径
};
mailgun.messages（）.send（数据、函数（错误、正文）{
如果（错误）
console.log（'电子邮件错误：'，错误）；
});

---

请帮助

您不能像使用HTTP URL一样使用

gs://bucket name/path to file

URL从云存储下载文件。相反，您必须执行以下操作之一：

使用云存储SDK在本地下载文件，然后将其附加到电子邮件

或者，使用云存储SDK生成一个“”，它将为您提供文件的HTTPS URL，您可以使用该URL下载该文件

---

您可以将其作为缓冲区，并按如下方式发送：

var request = require('request');
var file = request("https://www.google.ca/images/branding/googlelogo/2x/googlelogo_color_272x92dp.png");

var data = {
  from: 'Excited User <me@samples.mailgun.org>',
  to: 'serobnic@mail.ru',
  subject: 'Hello',
  text: 'Testing some Mailgun awesomeness!',
  attachment: file
};

mailgun.messages().send(data, function (error, body) {
  console.log(body);
});

var request=require（'request'）；
var file=请求（“https://www.google.ca/images/branding/googlelogo/2x/googlelogo_color_272x92dp.png");
风险值数据={
发件人：'兴奋用户'，
致：'serobnic@mail.ru',
主题：“你好”，
文字：“测试一些邮枪的威力！”，
附件：档案
};
mailgun.messages（）.send（数据、函数（错误、正文）{
控制台日志（主体）；
});

---

从

在您给出的示例中，您正在使用

gs:：//bucket name/path

从云存储下载文件并将其作为附件发送。为此，您需要按照以下文档使用依赖项：

在这种情况下，您需要做的就是：

// var path = require("path");
const request = require('request');

var filepath = request(`gs://i-m-here-c01f6.appspot.com/Groups/${leaderId}`);

如果您想更具体地为文件指定属性，可以使用

新的mailgun.Attachments（options）

传入一个

options

参数，该参数如下所示：

options: {
  data: filepath,
  filename: 'name,jpg',
  contentType: 'image/jpeg',
  knownLength: 2019121,
};

在哪里

• 数据-可以是以下数据之一：
  • 表示附件的文件路径的字符串
  • 文件数据的缓冲区
  • 流的实例，表示它是可读流
• filename—用于附件的文件名。默认值为“文件”
• contentType—内容类型。流数据的情况下需要。例如图像/jpeg
• knownLength—以字节为单位的内容长度。流数据的情况下需要

---

[这是NoEmailer的一个例子，我花了很多时间从Firebase的云存储中动态附加附件。因此，希望它能帮助别人。你可以找到很多相似之处。

所有示例都在

Angular

/

TypeScript

中

它从component.html文件的某个地方开始

<form
  #formDirective="ngForm"
  [formGroup]="contactForm"
  (ngSubmit)="onSubmit(contactForm.value, formDirective)"
>
  <mat-form-field>
    <ngx-mat-file-input
      (change)="uploadFile($event)"
      formControlName="fileUploader"
      multiple
      type="file"
    >
    </ngx-mat-file-input>
  </mat-form-field>
</form>

从前端到后端，开发人员要动态地将文件附加到一封电子邮件中，需要使用正确的

contentType

、

downloadURL

、和

fileName

，这或多或少都是一件让人头疼的事情。我在WWW上找不到一个完整的解决方案，这就是为什么从前到后的答案

注意： 前端在Firebase端的UI/云存储上处理多个文件上传，所有文件都上传到Firebase。但是，只有一个动态添加的附件工作正常。我仍然不知道如何处理多个动态文件上传

import { AngularFirestore } from '@angular/fire/firestore';
import {
  AngularFireStorage,
  AngularFireStorageReference,
  AngularFireUploadTask,
} from '@angular/fire/storage';
import {
  FormBuilder,
  FormGroup,
  FormGroupDirective,
  Validators,
} from '@angular/forms';
import { throwError } from 'rxjs';
...

constructor(
  private angularFirestore: AngularFirestore,
  private angularFireStorage: AngularFireStorage,
  private formBuilder: FormBuilder
) {}

public contentType: string[] = [];
public downloadURL: string[] = [];
public fileName: string = '';
public maxFileSize = 20971520;

public contactForm: FormGroup = this.formBuilder.group({
  fileUploader: [
    '',
    Validators.compose([
      // Your validators rules...
    ]),
  ],
  ...
});
...

public onSubmit(form: any, formDirective: FormGroupDirective): void {
  form.contentType = this.contentType;
  form.fileUploader = this.downloadURL;
  form.fileName = this.fileName;

  this.angularFirestore
    .collection(String(process.env.FIRESTORE_COLLECTION_MESSAGES)) // Make sure the environmental variable is a string.
    .add(form)
    .then(() => {
      // Your logic, such as alert...
    .catch(() => {
      // Your error handling logic...  
    });
}

public uploadFile(event: any): void {
  // Iterate through all uploaded files.
  for (let i = 0; i < event.target.files.length; i++) {
    const file = event.target.files[i]; // Get each uploaded file.
    const fileName = file.name + '_' + Date.now(); // It makes sure files with the same name will be uploaded more than once and each of them will have unique ID, showing date (in milliseconds) of the upload.

    this.contentType = file.type;
    this.fileName = fileName;

    // Get file reference.
    const fileRef: AngularFireStorageReference = this.angularFireStorage.ref(
      fileName
    );

    // Create upload task.
    const task: AngularFireUploadTask = this.angularFireStorage.upload(
      fileName,
      file,
      file.type
    );

    // Upload file to Cloud Firestore.
    task
      .snapshotChanges()
      .pipe(
        finalize(() => {
          fileRef.getDownloadURL().subscribe((downloadURL: string) => {
            this.angularFirestore
              .collection(String(process.env.FIRESTORE_COLLECTION_FILES)) // Make sure the environmental variable is a string.
              .add({ downloadURL: downloadURL });
            this.downloadURL.push(downloadURL);
          });
        }),
        catchError((error: any) => {
          return throwError(error);
        })
      )
      .subscribe();
  }
}

import { DocumentSnapshot } from 'firebase-functions/lib/providers/firestore';
import { EventContext } from 'firebase-functions';

async function onCreateSendEmail(
  snap: DocumentSnapshot,
  _context: EventContext
) {
  try {
    const contactFormData = snap.data();

    // You can use those to debug your code...
    console.log('Submitted contact form: ', contactFormData);
    console.log('context: ', _context); // This log will be shown in Firebase Functions logs.

    const mailTransport: Mail = nodemailer.createTransport({
      // Make sure the environmental variables have proper typings.
      host: String(process.env.MAIL_HOST),
      port: Number(process.env.MAIL_PORT),
      auth: {
        user: String(process.env.MAIL_ACCOUNT),
        pass: String(process.env.MAIL_PASSWORD),
      },
      tls: {
        rejectUnauthorized: false, //! Fix ERROR "Hostname/IP doesn't match certificate's altnames".
      },
    });

    const mailOptions = {
      attachments: [
        {
          contentType: `${contactFormData!.contentType}`,
          filename: `${contactFormData!.fileName}`,
          path: `${contactFormData!.fileUploader}`,
        },
      ],
      ... // Your other mails options such as bcc, from, to, subject, html...
    };

    await mailTransport.sendMail(mailOptions);
  } catch (err) {
    console.error(err);
  }
}