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main.go
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main.go
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// Copyright (c) 2024 Proton AG
//
// This file is part of Proton Mail Bridge.
//
// Proton Mail Bridge is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Proton Mail Bridge is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
package main
import (
"bytes"
"crypto/tls"
"flag"
"fmt"
"os"
"github.com/emersion/go-sasl"
"github.com/emersion/go-smtp"
)
var (
serverURL = flag.String("server", "127.0.0.1:1025", "SMTP server address:port")
userName = flag.String("user-name", "user", "SMTP user name")
userPassword = flag.String("user-pwd", "password", "SMTP user password")
toAddr = flag.String("toAddr", "", "Address toAddr whom toAddr send the message")
)
func main() {
flag.Parse()
flag.Usage = func() {
fmt.Printf("Usage %v [options] file0 ... fileN\n", os.Args[0])
fmt.Printf("\nOptions:\n")
flag.PrintDefaults()
}
if len(*toAddr) == 0 {
panic(fmt.Errorf("to flag can't be empty"))
}
args := flag.Args()
if len(args) == 0 {
flag.Usage()
return
}
smtpClient, err := smtp.Dial(*serverURL)
if err != nil {
panic(fmt.Errorf("failed to connect to server: %w", err))
}
defer func() { _ = smtpClient.Close() }()
// Upgrade to TLS.
if err := smtpClient.StartTLS(&tls.Config{InsecureSkipVerify: true}); err != nil {
panic(fmt.Errorf("failed to starttls: %w", err))
}
// Authorize with SASL PLAIN.
if err := smtpClient.Auth(sasl.NewPlainClient(
*userName,
*userName,
*userPassword,
)); err != nil {
panic(fmt.Errorf("failed to login: %w", err))
}
for idx, v := range args {
fileData, err := os.ReadFile(v)
if err != nil {
panic(fmt.Errorf("failed to read file:%v - %w", v, err))
}
// Send the message.
if err := smtpClient.SendMail(
*userName,
[]string{*toAddr},
bytes.NewReader(fileData),
); err != nil {
panic(fmt.Errorf("failed to send msg %v: %w", idx, err))
}
}
}