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courier.go
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courier.go
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package courier
import (
"context"
"crypto/tls"
"fmt"
"strconv"
"time"
"github.com/cenkalti/backoff"
"github.com/gofrs/uuid"
"github.com/pkg/errors"
"gopkg.in/gomail.v2"
"github.com/ory/x/errorsx"
"github.com/ory/kratos/driver/configuration"
"github.com/ory/kratos/x"
)
type (
smtpDependencies interface {
PersistenceProvider
x.LoggingProvider
}
Courier struct {
dialer *gomail.Dialer
d smtpDependencies
c configuration.Provider
// graceful shutdown handling
ctx context.Context
shutdown context.CancelFunc
}
Provider interface {
Courier() *Courier
}
)
func NewSMTP(d smtpDependencies, c configuration.Provider) *Courier {
uri := c.CourierSMTPURL()
sslSkipVerify, _ := strconv.ParseBool(uri.Query().Get("skip_ssl_verify"))
password, _ := uri.User.Password()
port, _ := strconv.ParseInt(uri.Port(), 10, 64)
ctx, cancel := context.WithCancel(context.Background())
return &Courier{
d: d,
c: c,
ctx: ctx,
shutdown: cancel,
dialer: &gomail.Dialer{
Host: uri.Hostname(),
Port: int(port),
Username: uri.User.Username(),
Password: password,
SSL: uri.Scheme == "smtps",
/* #nosec we need to support SMTP servers wihout TLS */
TLSConfig: &tls.Config{InsecureSkipVerify: sslSkipVerify},
},
}
}
func (m *Courier) QueueEmail(ctx context.Context, t EmailTemplate) (uuid.UUID, error) {
body, err := t.EmailBody()
if err != nil {
return uuid.Nil, err
}
subject, err := t.EmailSubject()
if err != nil {
return uuid.Nil, err
}
recipient, err := t.EmailRecipient()
if err != nil {
return uuid.Nil, err
}
message := &Message{
Status: MessageStatusQueued,
Type: MessageTypeEmail,
Body: body,
Subject: subject,
Recipient: recipient,
}
if err := m.d.CourierPersister().AddMessage(ctx, message); err != nil {
return uuid.Nil, err
}
return message.ID, nil
}
func (m *Courier) Work() error {
errChan := make(chan error)
defer close(errChan)
go m.watchMessages(m.ctx, errChan)
select {
case <-m.ctx.Done():
if m.ctx.Err() == context.Canceled {
return nil
}
return m.ctx.Err()
case err := <-errChan:
return err
}
}
func (m *Courier) Shutdown(ctx context.Context) error {
m.shutdown()
return nil
}
func (m *Courier) watchMessages(ctx context.Context, errChan chan error) {
for {
if err := backoff.Retry(func() error {
messages, err := m.d.CourierPersister().NextMessages(ctx, 10)
if err != nil {
if errorsx.Cause(err) == ErrQueueEmpty {
return nil
}
return err
}
for k := range messages {
var msg = messages[k]
switch msg.Type {
case MessageTypeEmail:
from := m.c.CourierSMTPFrom()
gm := gomail.NewMessage()
gm.SetHeader("From", from)
gm.SetHeader("To", msg.Recipient)
gm.SetHeader("Subject", msg.Subject)
gm.SetBody("text/plain", msg.Body)
gm.AddAlternative("text/html", msg.Body)
if err := m.dialer.DialAndSend(gm); err != nil {
m.d.Logger().
WithError(err).
WithField("smtp_server", fmt.Sprintf("%s:%d", m.dialer.Host, m.dialer.Port)).
WithField("smtp_ssl_enabled", m.dialer.SSL).
// WithField("email_to", msg.Recipient).
WithField("message_from", from).
Error("Unable to send email using SMTP connection.")
continue
}
if err := m.d.CourierPersister().SetMessageStatus(ctx, msg.ID, MessageStatusSent); err != nil {
m.d.Logger().
WithError(err).
WithField("message_id", msg.ID).
Error(`Unable to set the message status to "sent".`)
return err
}
m.d.Logger().
WithField("message_id", msg.ID).
WithField("message_type", msg.Type).
WithField("message_subject", msg.Subject).
Debug("Courier sent out message.")
default:
return errors.Errorf("received unexpected message type: %d", msg.Type)
}
}
return nil
}, backoff.NewExponentialBackOff()); err != nil {
errChan <- err
return
}
time.Sleep(time.Second)
}
}