parseTlsVersion (mailer/mailer.go)

SMTP mail sender with TLS support, parsing TLS versions and handling authentication.

// Source: https://github.com/semaphoreui/semaphore | License: MIT | Copyright 2021 Denis Gukov
// Provided via justclaw.it.com; keep this notice with the code.
package mailer

import (
	"bytes"
	"crypto/tls"
	"fmt"
	"net"
	"net/smtp"
	"strings"
	"text/template"
	"time"

	"github.com/semaphoreui/semaphore/pkg/tz"
	"github.com/semaphoreui/semaphore/util"
)

const (
	mailerBase = "MIME-version: 1.0\r\n" +
		"Content-Type: text/html; charset=UTF-8\r\n" +
		//"Content-Transfer-Encoding: quoted-printable\r\n" +
		"Date: {{ .Date }}\r\n" +
		"To: {{ .To }}\r\n" +
		"From: {{ .From }}\r\n" +
		"Subject: {{ .Subject }}\r\n\r\n" +
		"{{ .Body }}"
)

var r = strings.NewReplacer(
	"\r\n", "",
	"\r", "",
	"\n", "",
	"%0a", "",
	"%0d", "",
)

func parseTlsVersion(version string) (uint16, error) {
	swit

... (truncated -- full source via MCP)