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dir.go
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dir.go
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// Copyright © 2022 The Things Network Foundation, The Things Industries B.V.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package dir
import (
"context"
"crypto/rand"
"errors"
"fmt"
"os"
"path/filepath"
"github.com/oklog/ulid/v2"
"go.thethings.network/lorawan-stack/v3/pkg/email"
gomail "gopkg.in/mail.v2"
)
// MailDir is an email.Sender implementation that writes emails to a directory.
type MailDir struct {
emailConfig email.Config
dir string
messageSettings []gomail.MessageSetting
}
// New returns a new email.Sender that writes emails to dir.
func New(_ context.Context, emailConfig email.Config, dir string) (*MailDir, error) {
info, err := os.Stat(dir)
switch {
case errors.Is(err, os.ErrNotExist):
err = os.MkdirAll(dir, 0o755)
if err != nil {
return nil, err
}
case err != nil:
return nil, err
case !info.IsDir():
return nil, fmt.Errorf("%q is not a dir", dir)
}
return &MailDir{
emailConfig: emailConfig,
dir: dir,
messageSettings: []gomail.MessageSetting{
gomail.SetEncoding(gomail.Unencoded),
},
}, nil
}
func (md *MailDir) ulid() ulid.ULID {
return ulid.MustNew(ulid.Now(), rand.Reader)
}
// Send implements email.Sender.
func (md *MailDir) Send(message *email.Message) (err error) {
m := gomail.NewMessage(md.messageSettings...)
m.SetAddressHeader("From", md.emailConfig.SenderAddress, md.emailConfig.SenderName)
m.SetAddressHeader("To", message.RecipientAddress, message.RecipientName)
m.SetHeader("Subject", message.Subject)
if message.TextBody != "" {
m.AddAlternative("text/plain", message.TextBody)
}
if message.HTMLBody != "" {
m.AddAlternative("text/html", message.HTMLBody)
}
f, err := os.OpenFile(
filepath.Join(md.dir, fmt.Sprintf("%s.eml", md.ulid().String())),
os.O_WRONLY|os.O_CREATE|os.O_EXCL,
0o644,
)
defer func() {
if closeErr := f.Close(); err == nil {
err = closeErr
}
}()
_, err = m.WriteTo(f)
return err
}