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sender.go
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sender.go
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// Golang port of Overleaf
// Copyright (C) 2021-2023 Jakob Ackermann <das7pad@outlook.com>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package email
import (
"bytes"
"context"
"crypto/tls"
"io"
"log"
"mime"
"mime/multipart"
"net"
"net/mail"
"net/smtp"
"github.com/das7pad/overleaf-go/pkg/errors"
)
type Sender interface {
Send(ctx context.Context, from, to Identity, blob []byte) error
}
func NewSender(address SMTPAddress, smtpHello string, smtpAuth smtp.Auth) Sender {
switch address {
case "collect":
return &collectingSender{}
case "discard":
return discardSender{}
case "log":
return loggingSender{}
default:
return smtpSender{
addr: address,
auth: smtpAuth,
hello: smtpHello,
}
}
}
type ParsedEmail struct {
mail.Header
Parts map[string]string
}
type collectingSender struct {
blobs [][]byte
}
func (c *collectingSender) Send(_ context.Context, _, _ Identity, blob []byte) error {
c.blobs = append(c.blobs, blob)
return nil
}
func (c *collectingSender) Parse() ([]ParsedEmail, error) {
emails := make([]ParsedEmail, len(c.blobs))
for i, blob := range c.blobs {
m, err := mail.ReadMessage(bytes.NewReader(blob))
if err != nil {
return nil, err
}
_, params, err := mime.ParseMediaType(m.Header.Get("Content-Type"))
if err != nil {
return nil, err
}
r := multipart.NewReader(m.Body, params["boundary"])
parts := make(map[string]string, 2)
for {
p, err2 := r.NextPart()
if err2 == io.EOF {
break
}
if err2 != nil {
return nil, err2
}
body, err2 := io.ReadAll(p)
if err2 != nil {
return nil, err2
}
parts[p.Header.Get("Content-Type")] = string(body)
}
emails[i] = ParsedEmail{Header: m.Header, Parts: parts}
}
return emails, nil
}
type discardSender struct {
}
func (discardSender) Send(_ context.Context, _, _ Identity, _ []byte) error {
return nil
}
type loggingSender struct {
}
func (l loggingSender) Send(_ context.Context, _, _ Identity, blob []byte) error {
log.Println(string(blob))
return nil
}
type smtpSender struct {
addr SMTPAddress
auth smtp.Auth
hello string
}
func (s smtpSender) Send(ctx context.Context, from, to Identity, blob []byte) error {
var d net.Dialer
conn, err := d.DialContext(ctx, "tcp", string(s.addr))
if err != nil {
return errors.Tag(err, "connect")
}
ctx, done := context.WithCancel(ctx)
defer done()
go func() {
<-ctx.Done()
_ = conn.Close()
}()
c, err := smtp.NewClient(conn, s.addr.Host())
if err != nil {
return errors.Tag(err, "create client")
}
defer func() { _ = c.Close() }()
if err = c.Hello(s.hello); err != nil {
return errors.Tag(err, "hello")
}
if ok, _ := c.Extension("STARTTLS"); ok {
if err = c.StartTLS(&tls.Config{ServerName: s.addr.Host()}); err != nil {
return errors.Tag(err, "starttls")
}
}
if s.auth != nil {
if ok, _ := c.Extension("AUTH"); !ok {
return errors.New("expected AUTH support")
}
if err = c.Auth(s.auth); err != nil {
return errors.Tag(err, "auth")
}
}
if err = c.Mail(string(from.Address)); err != nil {
return errors.Tag(err, "mail")
}
if err = c.Rcpt(string(to.Address)); err != nil {
return errors.Tag(err, "receipt")
}
w, err := c.Data()
if err != nil {
return errors.Tag(err, "data")
}
if _, err = w.Write(blob); err != nil {
return errors.Tag(err, "write")
}
if err = w.Close(); err != nil {
return errors.Tag(err, "flush write")
}
if err = c.Quit(); err != nil {
return errors.Tag(err, "quit")
}
return nil
}