✨ Postman the notifier

pkg/internal/services/postman.go

@@ -0,0 +1,169 @@
+package services
+
+import (
+	"context"
+	"crypto/tls"
+	"firebase.google.com/go/messaging"
+	"fmt"
+	"git.solsynth.dev/hydrogen/dealer/pkg/proto"
+	"github.com/jordan-wright/email"
+	"github.com/rs/zerolog/log"
+	"github.com/sideshow/apns2"
+	payload2 "github.com/sideshow/apns2/payload"
+	"github.com/spf13/viper"
+	"net/smtp"
+	"net/textproto"
+	"time"
+)
+
+var deliveryTaskQueue = make(chan any, 256)
+
+func PublishDeliveryTask(task any) {
+	deliveryTaskQueue <- task
+}
+
+func ConsumeDeliveryTasks() {
+	for {
+		task := <-deliveryTaskQueue
+		switch tk := task.(type) {
+		case *proto.DeliverEmailRequest:
+			if tk.GetEmail().HtmlBody != nil {
+				_ = SendMailHTML(tk.GetTo(), tk.GetEmail().GetSubject(), tk.GetEmail().GetHtmlBody())
+			} else {
+				_ = SendMail(tk.GetTo(), tk.GetEmail().GetSubject(), tk.GetEmail().GetTextBody())
+			}
+		case *proto.DeliverNotificationRequest:
+			switch tk.GetProvider() {
+			case "firebase":
+				_ = PushFirebaseNotify(tk.GetDeviceToken(), tk.GetNotify())
+			case "apple":
+				_ = PushAppleNotify(tk.GetDeviceToken(), tk.GetNotify())
+			}
+		}
+	}
+}
+
+func PushFirebaseNotify(token string, in *proto.NotifyRequest) error {
+	if ExtFire == nil {
+		return fmt.Errorf("firebase push notification is unavailable")
+	}
+
+	start := time.Now()
+
+	ctx := context.Background()
+	client, err := ExtFire.Messaging(ctx)
+	if err != nil {
+		return fmt.Errorf("failed to create firebase client")
+	}
+
+	var image string
+	if in.Picture != nil {
+		image = *in.Picture
+	}
+	var subtitle string
+	if in.Subtitle != nil {
+		subtitle = "\n" + *in.Subtitle
+	}
+	message := &messaging.Message{
+		Notification: &messaging.Notification{
+			Title:    in.Title,
+			Body:     subtitle + in.Body,
+			ImageURL: image,
+		},
+		Token: token,
+	}
+
+	if response, err := client.Send(ctx, message); err != nil {
+		log.Warn().Err(err).Msg("An error occurred when notify subscriber via FCM...")
+	} else {
+		log.Debug().
+			Dur("elapsed", time.Since(start)).
+			Str("response", response).
+			Msg("Push a notify via firebase")
+	}
+
+	return nil
+}
+
+func PushAppleNotify(token string, in *proto.NotifyRequest) error {
+	if ExtAPNS == nil {
+		return fmt.Errorf("apple push notification is unavailable")
+	}
+
+	start := time.Now()
+
+	data := payload2.
+		NewPayload().
+		AlertTitle(in.GetTitle()).
+		AlertBody(in.GetBody()).
+		Category(in.GetTopic()).
+		Sound("default").
+		MutableContent()
+	if in.Avatar != nil {
+		data = data.Custom("avatar", *in.Avatar)
+	}
+	if in.Picture != nil {
+		data = data.Custom("picture", *in.Picture)
+	}
+	rawData, err := data.MarshalJSON()
+	if err != nil {
+		log.Warn().Err(err).Msg("An error occurred when preparing to notify subscriber via APNs...")
+	}
+	payload := &apns2.Notification{
+		DeviceToken: token,
+		Topic:       viper.GetString("apns_topic"),
+		Payload:     rawData,
+	}
+
+	if resp, err := ExtAPNS.Push(payload); err != nil {
+		log.Warn().Err(err).Msg("An error occurred when notify subscriber via APNs...")
+	} else {
+		log.Debug().
+			Dur("elapsed", time.Since(start)).
+			Str("reason", resp.Reason).
+			Int("status", resp.StatusCode).
+			Msg("Push a notify via firebase")
+	}
+
+	return nil
+}
+
+func SendMail(target string, subject string, content string) error {
+	mail := &email.Email{
+		To:      []string{target},
+		From:    viper.GetString("mailer.name"),
+		Subject: subject,
+		Text:    []byte(content),
+		Headers: textproto.MIMEHeader{},
+	}
+	return mail.SendWithTLS(
+		fmt.Sprintf("%s:%d", viper.GetString("mailer.smtp_host"), viper.GetInt("mailer.smtp_port")),
+		smtp.PlainAuth(
+			"",
+			viper.GetString("mailer.username"),
+			viper.GetString("mailer.password"),
+			viper.GetString("mailer.smtp_host"),
+		),
+		&tls.Config{ServerName: viper.GetString("mailer.smtp_host")},
+	)
+}
+
+func SendMailHTML(target string, subject string, content string) error {
+	mail := &email.Email{
+		To:      []string{target},
+		From:    viper.GetString("mailer.name"),
+		Subject: subject,
+		HTML:    []byte(content),
+		Headers: textproto.MIMEHeader{},
+	}
+	return mail.SendWithTLS(
+		fmt.Sprintf("%s:%d", viper.GetString("mailer.smtp_host"), viper.GetInt("mailer.smtp_port")),
+		smtp.PlainAuth(
+			"",
+			viper.GetString("mailer.username"),
+			viper.GetString("mailer.password"),
+			viper.GetString("mailer.smtp_host"),
+		),
+		&tls.Config{ServerName: viper.GetString("mailer.smtp_host")},
+	)
+}

pkg/internal/services/pusher_conn.go

@@ -0,0 +1,43 @@
+package services
+
+import (
+	"context"
+	firebase "firebase.google.com/go"
+	"github.com/sideshow/apns2"
+	"github.com/sideshow/apns2/token"
+	"github.com/spf13/viper"
+	"google.golang.org/api/option"
+)
+
+// ExtFire is a Firebase App client
+var ExtFire *firebase.App
+
+func SetupFirebase() error {
+	opt := option.WithCredentialsFile(viper.GetString("firebase_credentials"))
+	app, err := firebase.NewApp(context.Background(), nil, opt)
+	if err != nil {
+		return err
+	} else {
+		ExtFire = app
+	}
+
+	return nil
+}
+
+// ExtAPNS is an Apple Push Notification Services client
+var ExtAPNS *apns2.Client
+
+func SetupAPNS() error {
+	authKey, err := token.AuthKeyFromFile(viper.GetString("apns_credentials"))
+	if err != nil {
+		return err
+	}
+
+	ExtAPNS = apns2.NewTokenClient(&token.Token{
+		AuthKey: authKey,
+		KeyID:   viper.GetString("apns_credentials_key"),
+		TeamID:  viper.GetString("apns_credentials_team"),
+	}).Production()
+
+	return nil
+}