use log over fmt

controllers/emailController.go

@@ -0,0 +1,79 @@
+package controllers
+
+import (
+	"bytes"
+	"fmt"
+	"html/template"
+	"log"
+	"net/smtp"
+	"os"
+)
+
+type Config struct {
+	Server   string
+	Port     int
+	Email    string
+	Password string
+}
+
+var config Config = Config{
+	Server:   "smtp.gmail.com",
+	Port:     587,
+	Email:    os.Getenv("SYSTEM_EMAIL"),
+	Password: os.Getenv("SYSTEM_PASSWORD"),
+}
+
+type Request struct {
+	from    string
+	to      []string
+	subject string
+	body    string
+}
+
+const (
+	MIME = "MIME-version: 1.0;\nContent-Type: text/html; charset=\"UTF-8\";\n\n"
+)
+
+func NewRequest(to []string, subject string) *Request {
+	return &Request{
+		to:      to,
+		subject: subject,
+	}
+}
+
+func (r *Request) parseTemplate(fileName string, data interface{}) error {
+	t, err := template.ParseFiles(fileName)
+	if err != nil {
+		return err
+	}
+	buffer := new(bytes.Buffer)
+	if err = t.Execute(buffer, data); err != nil {
+		return err
+	}
+	r.body = buffer.String()
+	return nil
+}
+
+func (r *Request) sendMail() bool {
+	body := "To: " + r.to[0] + "\r\nSubject: " + r.subject + "\r\n" + MIME + "\r\n" + r.body
+	SMTP := fmt.Sprintf("%s:%d", config.Server, config.Port)
+	if err := smtp.SendMail(SMTP, smtp.PlainAuth("", config.Email, config.Password, config.Server), config.Email, r.to, []byte(body)); err != nil {
+		return false
+	}
+	return true
+}
+
+func (r *Request) Send(templateName string, items interface{}) bool {
+	err := r.parseTemplate(templateName, items)
+	if err != nil {
+		log.Fatal(err)
+		return false
+	}
+	if ok := r.sendMail(); ok {
+		log.Printf("Email has been sent to %s\n", r.to)
+		return true
+	} else {
+		log.Printf("Failed to send the email to %s\n", r.to)
+		return false
+	}
+}