loopback-sendgrid

This component can used to leverage (sendgrid)[https://sendgrid.com/] email services from your loopback 4 application.

Installation & Configuration

Install the @eyc/loopback-sendgrid using npm;

$ [npm install | yarn add] @eyc/loopback-sendgrid

Basic Configuration

Configure and load LoopbackSendgridComponent in the application constructor as shown below.

import {LoopbackSendgridComponent, SendgridBindings,
        LoopbackSendgridOptions} from '@eyc/loopback-sendgrid';
// ...

export class MyApplication extends BootMixin(ServiceMixin(RepositoryMixin(RestApplication))) {
    // ...

    const sendGridOpts: LoopbackSendgridOptions = {
      apiKey: process.env.SENDGRID_API_KEY,
      timeOut: 3000
    };
    this.configure(SendgridBindings.COMPONENT).to(sendGridOpts);

    // Finally register with the application
    this.component(LoopbackSendgridComponent);

    // ...
  }
  // ...
}

Environment Variable Configuration

You can use the following recommended environment variables, very useful specially when your application or micro service is containerized.

export SENDGRID_API_KEY = 'YOUR_APIKEY_FROM_SENDGRID';

If you want to use twilio username/password and NOT the apiKey, then do not set the SENDGRID_API_KEY but rather the following two environment variables and configure the user and password properties in the application.ts file.

export SENDGRID_TWILIO_USER = 'YOUR_USERNAME';
export SENDGRID_TWILIO_PASS = 'YOUR_PASSWORD',

How to use it

You can inject the sendGrid provider artifact directly in your controller or inside any service class as such:

import {SendgridBindings, SendGridMailData, SendgridProvider}
       from '@eyc/loopback-sendgrid';
// ...
constructor(
 @inject(SendgridBindings.PROVIDER) private sendGrid: SendgridProvider
)

// ...

And then you have access to the send or sendMultiple methods.

Sending a simple email

const data: SendGridMailData = {
  from: '[email protected]',
  to: '[email protected]',
  subject: 'Sending with Loopback and SendGrid is Fun',
  text: 'and easy to do anywhere, even with Node.js',
  html: '<strong>and easy to do anywhere, even with Node.js</strong>',
};

try {
  const result = await this.sendGrid.send(data);
} catch (err) {
  console.log(JSON.stringify(err));
}

Sending with a template ID

SendGrid allows you to create templates in their admin panel. Basically they can be based on html or text. The system replaced variables specified in the template such as {{orderNumber}} with that property inside an object you send along with the associated template ID. Note that this ID corresonds to the ID for the underlying versions associated to the template definition.

You can use Loopback models in the dynamicTemplateData. Also note that we don't have to specify the subject: property, since that's defined in the template definition screen at (sendgrid)[https://sendgrid.com/]

const data: SendGridMailData = {
  from: '[email protected]',
  to: '[email protected]',
  templateId: 'd-01ayourVersionedTemplateID240949cdffc46342',
  dynamicTemplateData: {
    firstName: 'Maria Paula',
    orderNumber: '23232323',
    total: 'USD 199.00',
  },
};

try {
  const result = await this.sendGrid.send(data);
} catch (err) {
  console.log(JSON.stringify(err));
}

Other typed Objects

The component exports from the original package the following interfaces

• SendGridMailData This is an interface that you can use in order to create the data to be sent to send or sendMultiple methods

• SendGridResponse This is the interface representing the full response from sendGrid, from there you can grab the x-message-id from the array response

• SendGridErrorResponse This is the Error Interface