Enhance project functionality: add email template, implement email sending, and improve table management routes

The table management in the database does currently not work

src/utils.go

@@ -1,11 +1,18 @@
 package main
 
 import (
+	"bytes"
 	"crypto/rand"
 	"encoding/hex"
 	"errors"
+	"html/template"
+	"log"
+	"os"
 	"strings"
 	"time"
+
+	"github.com/gin-gonic/gin"
+	"gopkg.in/gomail.v2"
 )
 
 func mustRandToken(n int) string {
@@ -134,3 +141,40 @@ func stripAfterDot(s string) string {
 	}
 	return s
 }
+
+func nameFromEmail(email string) string {
+	parts := strings.SplitN(email, "@", 2)
+	if len(parts) > 0 {
+		return parts[0]
+	}
+	return ""
+}
+
+func sendEmail(email string, token string) error {
+	// Parse the email body template
+	tmpl, err := template.ParseFiles("other/email.txt")
+	if err != nil {
+		panic(err)
+	}
+
+	// Execute template with provided data
+	var body bytes.Buffer
+	if err := tmpl.Execute(&body, gin.H{"Token": token, "Name": nameFromEmail(email)}); err != nil {
+		panic(err)
+	}
+
+	// Compose email
+	m := gomail.NewMessage()
+	m.SetHeader("From", os.Getenv("SMTP_MAIL"))
+	m.SetHeader("To", email)
+	m.SetHeader("Subject", "Registration/Login to QRank")
+	m.SetBody("text/plain", body.String())
+
+	// Dial and send
+	d := gomail.NewDialer(os.Getenv("SMTP_HOST"), 587, os.Getenv("SMTP_MAIL"), os.Getenv("SMTP_PASS"))
+	if err := d.DialAndSend(m); err != nil {
+		log.Fatalln(err)
+		return err
+	}
+	return nil
+}