mirror of
https://github.com/dawidd6/action-send-mail.git
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53 lines
2.4 KiB
JavaScript
53 lines
2.4 KiB
JavaScript
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"use strict";
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/**
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* Reads the Message-ID a receiving server gave the message out of its final 250 reply. Some
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* servers replace the Message-ID header of a submitted message with one of their own, and
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* the copy the recipients and the sent folder get carries that one instead of the id the
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* message was built with. Only replies in a format known to carry such an id are read.
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*/
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.parseServerMessageId = parseServerMessageId;
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// Microsoft 365 and Outlook.com: "250 2.0.0 OK <id@host.prod.outlook.com> [Hostname=...]"
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const OUTLOOK_REPLY = /^250 2\.0\.0 OK (<[^<>\s]+\.prod\.outlook\.com>)/i;
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// Amazon SES: "250 Ok 0100018b5c3c0a4f-...-000000", the local part of the Message-ID it sets
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const SES_REPLY = /^250 Ok ([0-9a-f]+(?:-[0-9a-f]+)+)$/i;
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// an AWS region name such as us-east-1 or ap-southeast-2
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const AWS_REGION = /^[a-z]{2}(?:-[a-z]+)+-\d+$/;
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/**
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* Finds the AWS region an SES SMTP endpoint is in from its hostname, such as
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* email-smtp.eu-west-1.amazonaws.com or a VPC endpoint name under it
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*
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* @param host SMTP hostname
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* @returns Region name, or undefined for a host outside amazonaws.com and awsapps.com
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*/
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function sesRegion(host) {
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const labels = host.toLowerCase().replace(/\.$/, '').split('.');
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const domain = labels.slice(-2).join('.');
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if (domain !== 'amazonaws.com' && domain !== 'awsapps.com') {
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return undefined;
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}
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return labels.slice(0, -2).find(label => AWS_REGION.test(label));
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}
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/**
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* Reads the server assigned Message-ID out of the final reply to a message
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*
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* @param response Final server reply for the message
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* @param [host] Hostname the connection was made to, SES replies are only read for an SES host
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* @returns The Message-ID with its angle brackets, or undefined when the reply names none
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*/
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function parseServerMessageId(response, host) {
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const reply = (response || '').toString().trim();
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const outlook = reply.match(OUTLOOK_REPLY);
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if (outlook) {
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return outlook[1];
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}
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const ses = reply.match(SES_REPLY);
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if (ses && host) {
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const region = sesRegion(host);
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if (region) {
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// the SES Message-ID domain is email.amazonses.com in us-east-1 and the region elsewhere
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return '<' + ses[1].toLowerCase() + '@' + (region === 'us-east-1' ? 'email' : region) + '.amazonses.com>';
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}
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}
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return undefined;
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}
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