3 files changed, 164 insertions, 0 deletions
diff --git a/utils/auth/auth.go b/utils/auth/auth.go
new file mode 100644
index 0000000..7b8f260
--- /dev/null
+++ b/utils/auth/auth.go
@@ -0,0 +1,26 @@
+package auth
+
+import (
+	"imageboard/models"
+
+	"github.com/gofiber/fiber/v2"
+)
+
+func GetCurrentUser(ctx *fiber.Ctx) *models.User {
+	if user, ok := ctx.Locals("User").(*models.User); ok {
+		return user
+	}
+	return nil
+}
+
+func IsAuthenticated(ctx *fiber.Ctx) bool {
+	return GetCurrentUser(ctx) != nil
+}
+
+func GetRedirectURL(ctx *fiber.Ctx) string {
+	referer := ctx.Get("Referer")
+	if referer != "" && referer != ctx.BaseURL()+"/login" && referer != ctx.BaseURL()+"/register" {
+		return referer
+	}
+	return "/"
+}
diff --git a/utils/email/email.go b/utils/email/email.go
new file mode 100644
index 0000000..fb1d58d
--- /dev/null
+++ b/utils/email/email.go
@@ -0,0 +1,124 @@
+package email
+
+import (
+	"bytes"
+	"fmt"
+	"html/template"
+	"imageboard/config"
+	"imageboard/database"
+	"imageboard/models"
+	"net/smtp"
+	"regexp"
+)
+
+func extractEmailAddress(from string) string {
+	re := regexp.MustCompile(`<([^>]+)>`)
+	matches := re.FindStringSubmatch(from)
+	if len(matches) == 2 {
+		return matches[1]
+	}
+	return from
+}
+
+func SendMail(to, subject, body string) error {
+	var auth smtp.Auth
+	if config.SMTP.Username != "" {
+		auth = smtp.PlainAuth("", config.SMTP.Username, config.SMTP.Password, config.SMTP.Host)
+	} else {
+		auth = nil
+	}
+	fromHeader := config.SMTP.From
+	fromAddress := extractEmailAddress(config.SMTP.From)
+	msg := fmt.Sprintf("From: %s\r\nTo: %s\r\nSubject: %s\r\nMIME-Version: 1.0\r\nContent-Type: text/html; charset=UTF-8\r\n\r\n%s",
+		fromHeader, to, subject, body)
+	addr := fmt.Sprintf("%s:%d", config.SMTP.Host, config.SMTP.Port)
+	return smtp.SendMail(addr, auth, fromAddress, []string{to}, []byte(msg))
+}
+
+func SendVerificationEmail(user *models.User) error {
+	token, err := database.GenerateEmailToken(int(user.ID), models.EmailTokenTypeVerification)
+	if err != nil {
+		return fmt.Errorf("failed to generate verification token: %w", err)
+	}
+
+	tmpl, err := template.ParseFiles("templates/email/verification.html")
+	if err != nil {
+		return fmt.Errorf("failed to parse email template: %w", err)
+	}
+	verificationLink := fmt.Sprintf("%s/account/verify?token=%s", config.Server.AppBaseURL, token.Token)
+	data := struct {
+		Username string
+		Appname  string
+		Link     string
+	}{
+		Username: user.Username,
+		Appname:  config.Server.AppName,
+		Link:     verificationLink,
+	}
+
+	var body bytes.Buffer
+	if err := tmpl.Execute(&body, data); err != nil {
+		return fmt.Errorf("failed to execute email template: %w", err)
+	}
+
+	subject := fmt.Sprintf("Verify your email for %s", config.Server.AppName)
+	return SendMail(user.Email, subject, body.String())
+}
+
+// func SendPasswordResetEmail(user *models.User) error {
+// 	token, err := user.GenerateToken(database.DB, models.EmailTokenTypePasswordReset)
+// 	if err != nil {
+// 		return fmt.Errorf("failed to generate password reset token: %w", err)
+// 	}
+
+// 	tmpl, err := template.ParseFiles("templates/email/password_reset.html")
+// 	if err != nil {
+// 		return fmt.Errorf("failed to parse email template: %w", err)
+// 	}
+// 	resetLink := fmt.Sprintf("%s/account/reset-password?token=%s", config.Server.AppBaseURL, token.Token)
+// 	data := struct {
+// 		Username string
+// 		Link     string
+// 	}{
+// 		Username: user.Username,
+// 		Link:     resetLink,
+// 	}
+
+// 	var body bytes.Buffer
+// 	if err := tmpl.Execute(&body, data); err != nil {
+// 		return fmt.Errorf("failed to execute email template: %w", err)
+// 	}
+
+// 	subject := fmt.Sprintf("Password reset for %s", config.Server.AppName)
+// 	return SendMail(user.Email, subject, body.String())
+// }
+
+// func SendEmailChangeConfirmation(user *models.User, newEmail string) error {
+// 	token, err := user.GenerateToken(database.DB, models.EmailTokenTypeChangeEmail)
+// 	if err != nil {
+// 		return fmt.Errorf("failed to generate email change token: %w", err)
+// 	}
+
+// 	tmpl, err := template.ParseFiles("templates/email/email_change.html")
+// 	if err != nil {
+// 		return fmt.Errorf("failed to parse email template: %w", err)
+// 	}
+// 	confirmLink := fmt.Sprintf("%s/account/confirm-email-change?token=%s&email=%s", config.Server.AppBaseURL, token.Token, newEmail)
+// 	data := struct {
+// 		Username string
+// 		NewEmail string
+// 		Link     string
+// 	}{
+// 		Username: user.Username,
+// 		NewEmail: newEmail,
+// 		Link:     confirmLink,
+// 	}
+
+// 	var body bytes.Buffer
+// 	if err := tmpl.Execute(&body, data); err != nil {
+// 		return fmt.Errorf("failed to execute email template: %w", err)
+// 	}
+
+// 	subject := fmt.Sprintf("Confirm email change for %s", config.Server.AppName)
+// 	return SendMail(newEmail, subject, body.String())
+// }
diff --git a/utils/validators/tokens.go b/utils/validators/tokens.go
new file mode 100644
index 0000000..f377c2e
--- /dev/null
+++ b/utils/validators/tokens.go
@@ -0,0 +1,14 @@
+package validators
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+)
+
+func GenerateRandomToken() (string, error) {
+	bytes := make([]byte, 32)
+	if _, err := rand.Read(bytes); err != nil {
+		return "", err
+	}
+	return hex.EncodeToString(bytes), nil
+}