const sendgrid = require('@sendgrid/mail');
/**
* Responds to an HTTP request from Cloud Tasks and sends an email using data
* from the request body.
*
* @param {object} req Cloud Function request context.
* @param {object} req.body The request payload.
* @param {string} req.body.to_email Email address of the recipient.
* @param {string} req.body.to_name Name of the recipient.
* @param {string} req.body.from_name Name of the sender.
* @param {object} res Cloud Function response context.
*/
exports.sendEmail = async (req, res) => {
// Get the SendGrid API key from the environment variable.
const key = process.env.SENDGRID_API_KEY;
if (!key) {
const error = new Error(
'SENDGRID_API_KEY was not provided as environment variable.'
);
error.code = 401;
throw error;
}
sendgrid.setApiKey(key);
// Get the body from the Cloud Task request.
const {to_email, to_name, from_name} = req.body;
if (!to_email) {
const error = new Error('Email address not provided.');
error.code = 400;
throw error;
} else if (!to_name) {
const error = new Error('Recipient name not provided.');
error.code = 400;
throw error;
} else if (!from_name) {
const error = new Error('Sender name not provided.');
error.code = 400;
throw error;
}
// Construct the email request.
const msg = {
to: to_email,
from: 'postcard@example.com',
subject: 'A Postcard Just for You!',
html: postcardHTML(to_name, from_name),
};
try {
await sendgrid.send(msg);
// Send OK to Cloud Task queue to delete task.
res.status(200).send('Postcard Sent!');
} catch (error) {
// Any status code other than 2xx or 503 will trigger the task to retry.
res.status(error.code).send(error.message);
}
};
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