/
email_client.go
79 lines (66 loc) · 1.9 KB
/
email_client.go
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package clients
import (
"fmt"
"github.com/go-gomail/gomail"
"github.com/solomonbaez/SB-Go-Newsletter-API/api/configs"
"github.com/solomonbaez/SB-Go-Newsletter-API/api/models"
)
type EmailClient interface {
SendEmail(email *models.Newsletter) error
}
type SMTPClient struct {
SmtpServer string // export for testing
SmtpPort int
smtpUsername string
smtpPassword string
Sender *models.SubscriberEmail
}
func NewSMTPClient(cfgFile *string) (client *SMTPClient, err error) {
var file string
if *cfgFile != "" {
if *cfgFile != "test" {
file = fmt.Sprintf("./api/configs/%v.yaml", *cfgFile)
} else {
file = "../api/configs/dev.yaml"
}
}
cfg, e := configs.ConfigureEmailClient(file)
if e != nil {
err = fmt.Errorf("failed to configure email client: %w", e)
return
}
sender, e := models.ParseEmail(cfg.Sender)
if e != nil {
err = fmt.Errorf("failed to parse email: %w", e)
return
}
client = &SMTPClient{
SmtpServer: cfg.Server,
SmtpPort: cfg.Port,
smtpUsername: cfg.Username,
smtpPassword: cfg.Password,
Sender: &sender,
}
return
}
func (client *SMTPClient) SendEmail(newsletter *models.Newsletter) (err error) {
if e := models.ParseNewsletter(newsletter); e != nil {
err = fmt.Errorf("invalid newsletter: %w", e)
return
} else if e = models.ParseNewsletter(newsletter.Content); e != nil {
err = fmt.Errorf("invalid newsletter content: %w", e)
return
}
m := gomail.NewMessage()
m.SetHeader("From", client.Sender.String())
m.SetHeader("To", newsletter.Recipient.String())
m.SetHeader("Subject", newsletter.Content.Title)
m.SetBody("text/plain", newsletter.Content.Text)
m.AddAlternative("text/html", newsletter.Content.Html)
dialer := gomail.NewDialer(client.SmtpServer, client.SmtpPort, client.smtpUsername, client.smtpPassword)
if e := dialer.DialAndSend(m); e != nil {
err = fmt.Errorf("failed to send email: %w", e)
return
}
return
}