Installing a mailer package and setting up a mail channel

cmd/web/main.go

@@ -33,7 +33,10 @@ func main() {
 		log.Fatal(err)
 	}
 	defer db.SQL.Close()
+	defer close(app.MailChan)
 
+	fmt.Println("Starting mail listener...")
+	listenForMail()
 	fmt.Printf("Starting application on port %s\n", portNumber)
 
 	srv := &http.Server{
@@ -52,6 +55,17 @@ func run() (*driver.DB, error) {
 	gob.Register(models.Room{})
 	gob.Register(models.Restriction{})
 
+	mailChan := make(chan models.MailData)
+	app.MailChan = mailChan
+
+	msg := models.MailData{
+		To:      "John@do.do",
+		From:    "me@here.com",
+		Subject: "mail",
+		Content: "Hello, <strong>world</strong>",
+	}
+	app.MailChan <- msg
+
 	// change this to true when in production
 	app.InProduction = false
 

cmd/web/send-mail.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"go-udemy-web-1/internal/models"
+	"log"
+	"time"
+
+	mail "github.com/xhit/go-simple-mail"
+)
+
+func listenForMail() {
+	go func() {
+		for {
+			msg := <-app.MailChan
+			sendMsg(msg)
+		}
+	}()
+}
+
+func sendMsg(m models.MailData) {
+	server := mail.NewSMTPClient()
+	server.Host = "localhost"
+	server.Port = 1025 // fake port
+	server.KeepAlive = false
+	server.ConnectTimeout = 10 * time.Second
+	server.SendTimeout = 10 * time.Second
+
+	client, err := server.Connect()
+	if err != nil {
+		errorLog.Println(err)
+	}
+
+	email := mail.NewMSG()
+	email.SetFrom(m.From).AddTo(m.To).SetSubject(m.Subject)
+	email.SetBody(mail.TextHTML, m.Content)
+
+	err = email.Send(client)
+	if err != nil {
+		log.Println(err)
+	} else {
+		log.Println("Email sent")
+	}
+}

go.mod

@@ -20,6 +20,7 @@ require (
 	github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2
 	github.com/jackc/pgconn v1.14.3
 	github.com/jackc/pgx/v5 v5.6.0
+	github.com/xhit/go-simple-mail v2.2.2+incompatible
 )
 
 require (

go.sum

@@ -36,6 +36,8 @@ github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81P
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
+github.com/xhit/go-simple-mail v2.2.2+incompatible h1:Hm2VGfLqiQJ/NnC8SYsrPOPyVYIlvP2kmnotP4RIV74=
+github.com/xhit/go-simple-mail v2.2.2+incompatible/go.mod h1:I8Ctg6vIJZ+Sv7k/22M6oeu/tbFumDY0uxBuuLbtU7Y=
 golang.org/x/crypto v0.25.0 h1:ypSNr+bnYL2YhwoMt2zPxHFmbAN1KZs/njMG3hxUp30=
 golang.org/x/crypto v0.25.0/go.mod h1:T+wALwcMOSE0kXgUAnPAHqTLW+XHgcELELW8VaDgm/M=
 golang.org/x/sync v0.7.0 h1:YsImfSBoP9QPYL0xyKJPq0gcaJdG3rInoqxTWbfQu9M=

internal/config/config.go

@@ -1,6 +1,7 @@
 package config
 
 import (
+	"go-udemy-web-1/internal/models"
 	"html/template"
 	"log"
 
@@ -15,4 +16,5 @@ type AppConfig struct {
 	InfoLog       *log.Logger
 	ErrorLog      *log.Logger
 	Session       *scs.SessionManager
+	MailChan      chan models.MailData
 }

internal/models/models.go

@@ -1,6 +1,8 @@
 package models
 
-import "time"
+import (
+	"time"
+)
 
 // User is the user model
 type User struct {
@@ -58,3 +60,11 @@ type RoomRestriction struct {
 	ReservationID int
 	RestrictionID int
 }
+
+// MailData holds an email message
+type MailData struct {
+	To      string
+	From    string
+	Subject string
+	Content string
+}