chore: extract mail to it's own service

service/mail.go

@@ -0,0 +1,93 @@
+package service
+
+import (
+	"fmt"
+	"log"
+	"me-fit/utils"
+	"net/smtp"
+	"os"
+)
+
+type ServiceMail interface {
+	SendMail(to string, subject string, message string) error
+}
+
+func NewServiceMail() ServiceMail {
+	enabled := os.Getenv("SMTP_ENABLED") == "true"
+	host := os.Getenv("SMTP_HOST")
+	port := os.Getenv("SMTP_PORT")
+	user := os.Getenv("SMTP_USER")
+	pass := os.Getenv("SMTP_PASS")
+	fromMail := os.Getenv("SMTP_FROM_MAIL")
+	fromName := os.Getenv("SMTP_FROM_NAME")
+
+	if enabled {
+		if host == "" {
+			log.Fatal("SMTP_HOST must be set")
+		}
+		if port == "" {
+			log.Fatal("SMTP_PORT must be set")
+		}
+		if user == "" {
+			log.Fatal("SMTP_USER must be set")
+		}
+		if pass == "" {
+			log.Fatal("SMTP_PASS must be set")
+		}
+		if fromMail == "" {
+			log.Fatal("SMTP_FROM_MAIL must be set")
+		}
+		if fromName == "" {
+			log.Fatal("SMTP_FROM_NAME must be set")
+		}
+
+		return NewServiceMailSmtp(host, port, user, pass, fromMail, fromName)
+	} else {
+		if utils.Environment == "prod" {
+			log.Fatal("SMTP_ENABLED must be set to true in production")
+		}
+		return NewServiceMailStub()
+	}
+}
+
+type ServiceMailSmtp struct {
+	host     string
+	port     string
+	auth     smtp.Auth
+	fromMail string
+	fromName string
+}
+
+func NewServiceMailSmtp(
+	host string,
+	port string,
+	user string,
+	pass string,
+	fromMail string,
+	fromName string) ServiceMailSmtp {
+	return ServiceMailSmtp{
+		host:     host,
+		port:     port,
+		auth:     smtp.PlainAuth("", user, pass, host),
+		fromMail: fromMail,
+		fromName: fromName,
+	}
+}
+
+func (service ServiceMailSmtp) SendMail(to string, subject string, message string) error {
+
+	msg := fmt.Sprintf("From: %v <%v>\nTo: %v\nSubject: %v\nMIME-version: 1.0;\nContent-Type: text/html; charset=\"UTF-8\";\n\n%v", service.fromName, service.fromMail, to, subject, message)
+
+	return smtp.SendMail(service.host+":"+service.port, service.auth, service.fromMail, []string{to}, []byte(msg))
+}
+
+type ServiceMailStub struct {
+}
+
+func NewServiceMailStub() ServiceMailStub {
+	return ServiceMailStub{}
+}
+
+func (service ServiceMailStub) SendMail(to string, subject string, message string) error {
+	return nil
+}