/
email.go
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/
email.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 identityserver
import (
"context"
"go.thethings.network/lorawan-stack/v3/pkg/email"
"go.thethings.network/lorawan-stack/v3/pkg/email/dir"
"go.thethings.network/lorawan-stack/v3/pkg/email/sendgrid"
"go.thethings.network/lorawan-stack/v3/pkg/email/smtp"
_ "go.thethings.network/lorawan-stack/v3/pkg/email/templates" // Register all email templates.
"go.thethings.network/lorawan-stack/v3/pkg/identityserver/store"
"go.thethings.network/lorawan-stack/v3/pkg/log"
"go.thethings.network/lorawan-stack/v3/pkg/ttnpb"
"golang.org/x/sync/errgroup"
)
// SendEmail sends an email.
func (is *IdentityServer) SendEmail(ctx context.Context, message *email.Message) (err error) {
logger := log.FromContext(ctx).WithFields(log.Fields(
"to", message.RecipientAddress,
"subject", message.Subject,
"template_name", message.TemplateName,
"body", message.TextBody,
))
isConfig := is.configFromContext(ctx)
var sender email.Sender
switch isConfig.Email.Provider {
case "sendgrid":
sender, err = sendgrid.New(ctx, isConfig.Email.Config, isConfig.Email.SendGrid)
case "smtp":
sender, err = smtp.New(ctx, isConfig.Email.Config, isConfig.Email.SMTP)
case "dir":
sender, err = dir.New(ctx, isConfig.Email.Config, isConfig.Email.Dir)
}
if err != nil {
logger.WithError(err).Warn("Could not send email without email provider")
return err
}
if sender == nil {
logger.Warn("Could not send email without email provider")
return nil
}
err = sender.Send(message)
if err != nil {
logger.WithError(err).Warn("Failed to send email")
return err
}
return nil
}
// SendTemplateEmailToUsers sends an email to users.
func (is *IdentityServer) SendTemplateEmailToUsers(ctx context.Context, templateName string, dataBuilder email.TemplateDataBuilder, receivers ...*ttnpb.User) error {
networkConfig := is.configFromContext(ctx).Email.Network
emailTemplate := email.GetTemplate(ctx, templateName)
var wg errgroup.Group
for _, receiver := range receivers {
receiver := receiver // shadow range variable.
wg.Go(func() error {
templateData, err := dataBuilder(
ctx,
email.NewTemplateData(&networkConfig, receiver),
)
if err != nil {
return err
}
message, err := emailTemplate.Execute(templateData)
if err != nil {
return err
}
return is.SendEmail(ctx, message)
})
}
return wg.Wait()
}
// SendNotificationEmailToUsers sends a notification email to users.
func (is *IdentityServer) SendNotificationEmailToUsers(ctx context.Context, notification *ttnpb.Notification, receivers ...*ttnpb.User) error {
networkConfig := is.configFromContext(ctx).Email.Network
emailNotification := email.GetNotification(ctx, notification.GetNotificationType())
emailTemplate := email.GetTemplate(ctx, emailNotification.EmailTemplateName)
var wg errgroup.Group
for _, receiver := range receivers {
receiver := receiver // shadow range variable.
wg.Go(func() error {
templateData, err := emailNotification.DataBuilder(
ctx,
email.NewNotificationTemplateData(email.NewTemplateData(&networkConfig, receiver), notification),
)
if err != nil {
return err
}
message, err := emailTemplate.Execute(templateData)
if err != nil {
return err
}
return is.SendEmail(ctx, message)
})
}
return wg.Wait()
}
var emailUserFields = store.FieldMask{"ids", "name", "primary_email_address"}
// SendTemplateEmailToUserIDs looks up the users and sends them an email.
func (is *IdentityServer) SendTemplateEmailToUserIDs(ctx context.Context, templateName string, dataBuilder email.TemplateDataBuilder, receiverIDs ...*ttnpb.UserIdentifiers) error {
var receivers []*ttnpb.User
err := is.store.Transact(ctx, func(ctx context.Context, st store.Store) (err error) {
receivers, err = st.FindUsers(ctx, receiverIDs, emailUserFields)
return err
})
if err != nil {
return err
}
return is.SendTemplateEmailToUsers(ctx, templateName, dataBuilder, receivers...)
}
var notificationEmailUserFields = store.FieldMask{"ids", "name", "primary_email_address", "admin"}
// SendNotificationEmailToUserIDs looks up the users and sends them a notification email.
func (is *IdentityServer) SendNotificationEmailToUserIDs(ctx context.Context, notification *ttnpb.Notification, receiverIDs ...*ttnpb.UserIdentifiers) error {
var receivers []*ttnpb.User
err := is.store.Transact(ctx, func(ctx context.Context, st store.Store) (err error) {
receivers, err = st.FindUsers(ctx, receiverIDs, notificationEmailUserFields)
return err
})
if err != nil {
return err
}
return is.SendNotificationEmailToUsers(ctx, notification, receivers...)
}