first commit

internal/services/about_service.go

@@ -0,0 +1,330 @@
+package services
+
+import (
+	"errors"
+	"fmt"
+	"regexp"
+	"strings"
+
+	"gauth-central/internal/database"
+	"gauth-central/internal/models"
+
+	"gorm.io/gorm"
+)
+
+type AboutService struct{}
+
+func NewAboutService() *AboutService {
+	return &AboutService{}
+}
+
+// CreateAbout creates a new about entry.
+func (s *AboutService) CreateAbout(
+	title string,
+	image string,
+	imageSub string,
+	cv string,
+	birthday string,
+	city string,
+	study string,
+	website string,
+	phone string,
+	age string,
+	interests string,
+	degree string,
+	x string,
+	mail string,
+	done *int,
+	projectDone string,
+	userH *int,
+	hapyUser string,
+	great *int,
+	greatReviews string,
+	team *int,
+	supportTeam string,
+	isActive bool,
+	counterActive bool,
+) (*models.About, error) {
+	slug := s.generateUniqueSlug(slugifyAbout(title), "")
+
+	about := models.About{
+		Title:         title,
+		Image:         image,
+		ImageSub:      imageSub,
+		CV:            cv,
+		Birthday:      birthday,
+		City:          city,
+		Study:         study,
+		Website:       website,
+		Phone:         phone,
+		Age:           age,
+		Interests:     interests,
+		Degree:        degree,
+		X:             x,
+		Mail:          mail,
+		Done:          done,
+		ProjectDone:   projectDone,
+		UserH:         userH,
+		HapyUser:      hapyUser,
+		Great:         great,
+		GreatReviews:  greatReviews,
+		Team:          team,
+		SupportTeam:   supportTeam,
+		Slug:          slug,
+		IsActive:      isActive,
+		CounterActive: counterActive,
+	}
+
+	if err := database.DB.Create(&about).Error; err != nil {
+		return nil, err
+	}
+
+	return s.GetAboutByID(about.ID.String())
+}
+
+// GetAllAbout retrieves all about entries. Use onlyActive to filter public data.
+func (s *AboutService) GetAllAbout(onlyActive bool) ([]models.About, error) {
+	var abouts []models.About
+	query := database.DB.Order("created_at desc")
+	if onlyActive {
+		query = query.Where("is_active = ?", true)
+	}
+
+	if err := query.Find(&abouts).Error; err != nil {
+		return nil, err
+	}
+
+	return abouts, nil
+}
+
+// GetFirstActiveAbout returns the newest active about entry.
+func (s *AboutService) GetFirstActiveAbout() (*models.About, error) {
+	var about models.About
+	if err := database.DB.Where("is_active = ?", true).Order("created_at desc").First(&about).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("about not found")
+		}
+		return nil, err
+	}
+	return &about, nil
+}
+
+// GetAboutByID retrieves an about entry by ID.
+func (s *AboutService) GetAboutByID(id string) (*models.About, error) {
+	var about models.About
+	if err := database.DB.Where("id = ?", id).First(&about).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("about not found")
+		}
+		return nil, err
+	}
+	return &about, nil
+}
+
+// GetAboutBySlug retrieves an about entry by slug. Use onlyActive to limit public access.
+func (s *AboutService) GetAboutBySlug(slug string, onlyActive bool) (*models.About, error) {
+	var about models.About
+	query := database.DB.Where("slug = ?", slug)
+	if onlyActive {
+		query = query.Where("is_active = ?", true)
+	}
+
+	if err := query.First(&about).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("about not found")
+		}
+		return nil, err
+	}
+
+	return &about, nil
+}
+
+// UpdateAbout updates an existing about entry.
+func (s *AboutService) UpdateAbout(
+	id string,
+	title *string,
+	image *string,
+	imageSub *string,
+	cv *string,
+	birthday *string,
+	city *string,
+	study *string,
+	website *string,
+	phone *string,
+	age *string,
+	interests *string,
+	degree *string,
+	x *string,
+	mail *string,
+	done *int,
+	projectDone *string,
+	userH *int,
+	hapyUser *string,
+	great *int,
+	greatReviews *string,
+	team *int,
+	supportTeam *string,
+	slug *string,
+	isActive *bool,
+	counterActive *bool,
+) (*models.About, error) {
+	about, err := s.GetAboutByID(id)
+	if err != nil {
+		return nil, err
+	}
+
+	updates := map[string]interface{}{}
+	if title != nil {
+		updates["title"] = *title
+	}
+	if image != nil {
+		updates["image"] = *image
+	}
+	if imageSub != nil {
+		updates["image_sub"] = *imageSub
+	}
+	if cv != nil {
+		updates["cv"] = *cv
+	}
+	if birthday != nil {
+		updates["birthday"] = *birthday
+	}
+	if city != nil {
+		updates["city"] = *city
+	}
+	if study != nil {
+		updates["study"] = *study
+	}
+	if website != nil {
+		updates["website"] = *website
+	}
+	if phone != nil {
+		updates["phone"] = *phone
+	}
+	if age != nil {
+		updates["age"] = *age
+	}
+	if interests != nil {
+		updates["interests"] = *interests
+	}
+	if degree != nil {
+		updates["degree"] = *degree
+	}
+	if x != nil {
+		updates["x"] = *x
+	}
+	if mail != nil {
+		updates["mail"] = *mail
+	}
+	if done != nil {
+		updates["done"] = *done
+	}
+	if projectDone != nil {
+		updates["project_done"] = *projectDone
+	}
+	if userH != nil {
+		updates["user_h"] = *userH
+	}
+	if hapyUser != nil {
+		updates["hapy_user"] = *hapyUser
+	}
+	if great != nil {
+		updates["great"] = *great
+	}
+	if greatReviews != nil {
+		updates["great_reviews"] = *greatReviews
+	}
+	if team != nil {
+		updates["team"] = *team
+	}
+	if supportTeam != nil {
+		updates["support_team"] = *supportTeam
+	}
+	if slug != nil {
+		clean := slugifyAbout(*slug)
+		if clean == "" {
+			return nil, errors.New("slug cannot be empty")
+		}
+		if s.slugExists(clean, id) {
+			return nil, errors.New("slug already exists")
+		}
+		updates["slug"] = clean
+	}
+	if isActive != nil {
+		updates["is_active"] = *isActive
+	}
+	if counterActive != nil {
+		updates["counter_active"] = *counterActive
+	}
+
+	if len(updates) > 0 {
+		if err := database.DB.Model(about).Updates(updates).Error; err != nil {
+			return nil, err
+		}
+	}
+
+	return s.GetAboutByID(id)
+}
+
+// DeleteAbout deletes an about entry by ID.
+func (s *AboutService) DeleteAbout(id string) error {
+	result := database.DB.Delete(&models.About{}, "id = ?", id)
+	if result.Error != nil {
+		return result.Error
+	}
+	if result.RowsAffected == 0 {
+		return errors.New("about not found")
+	}
+	return nil
+}
+
+func (s *AboutService) generateUniqueSlug(baseSlug string, excludeID string) string {
+	slug := baseSlug
+	counter := 1
+	for s.slugExists(slug, excludeID) {
+		slug = fmt.Sprintf("%s-%d", baseSlug, counter)
+		counter++
+	}
+	return slug
+}
+
+func (s *AboutService) slugExists(slug string, excludeID string) bool {
+	var count int64
+	query := database.DB.Model(&models.About{}).Where("slug = ?", slug)
+	if excludeID != "" {
+		query = query.Where("id <> ?", excludeID)
+	}
+	query.Count(&count)
+	return count > 0
+}
+
+func slugifyAbout(input string) string {
+	clean := strings.TrimSpace(input)
+	if clean == "" {
+		return ""
+	}
+
+	replacer := strings.NewReplacer(
+		"ı", "i",
+		"İ", "i",
+		"ş", "s",
+		"Ş", "s",
+		"ğ", "g",
+		"Ğ", "g",
+		"ç", "c",
+		"Ç", "c",
+		"ö", "o",
+		"Ö", "o",
+		"ü", "u",
+		"Ü", "u",
+	)
+
+	clean = strings.ToLower(replacer.Replace(clean))
+	re := regexp.MustCompile(`[^a-z0-9]+`)
+	clean = re.ReplaceAllString(clean, "-")
+	clean = strings.Trim(clean, "-")
+	if clean == "" {
+		return "about"
+	}
+	return clean
+}

internal/services/auth_service.go

@@ -0,0 +1,240 @@
+package services
+
+import (
+	"errors"
+	"time"
+
+	"gauth-central/internal/database"
+	"gauth-central/internal/models"
+	"gauth-central/pkg/utils"
+
+	"github.com/markbates/goth"
+	"gorm.io/gorm"
+)
+
+type AuthService struct {
+	jwtService *JWTService
+}
+
+func NewAuthService() *AuthService {
+	return &AuthService{
+		jwtService: NewJWTService(),
+	}
+}
+
+func (s *AuthService) Register(username, email, password string) (*models.User, string, string, string, error) {
+	// Check if user exists (including soft-deleted users)
+	var count int64
+	database.DB.Model(&models.User{}).Unscoped().Where("email = ?", email).Count(&count)
+	if count > 0 {
+		return nil, "", "", "", errors.New("email already registered")
+	}
+
+	hashedPassword, err := utils.HashPassword(password)
+	if err != nil {
+		return nil, "", "", "", err
+	}
+
+	verifyToken, err := utils.GenerateSecureToken(32)
+	if err != nil {
+		return nil, "", "", "", err
+	}
+
+	// Email/password users must verify email; tokens are not issued until verified
+	falseBool := false
+	user := models.User{
+		UserName:         username,
+		Email:            email,
+		Password:         hashedPassword,
+		EmailVerified:    &falseBool, // Explicitly set to false
+		EmailVerifyToken: verifyToken,
+	}
+
+	// Create user - EmailVerified will be false by default or explicitly set
+	if err := database.DB.Create(&user).Error; err != nil {
+		// Fallback check for duplicate key error just in case race condition
+		if utils.IsDuplicateKeyError(err) {
+			return nil, "", "", "", errors.New("email already registered")
+		}
+		return nil, "", "", "", err
+	}
+
+	// Assign default "user" role
+	var userRole models.Role
+	if err := database.DB.Where("name = ?", "user").First(&userRole).Error; err == nil {
+		database.DB.Model(&user).Association("Roles").Append(&userRole)
+	}
+
+	// Reload user with roles (no JWT until email verified)
+	database.DB.Preload("Roles.Permissions").First(&user, user.ID)
+
+	return &user, "", "", verifyToken, nil
+}
+
+func (s *AuthService) Login(email, password string) (*models.User, string, string, error) {
+	var user models.User
+	// Preload Roles and Permissions
+	if err := database.DB.Preload("Roles.Permissions").Where("email = ?", email).First(&user).Error; err != nil {
+		return nil, "", "", errors.New("invalid credentials")
+	}
+
+	if !utils.CheckPasswordHash(password, user.Password) {
+		return nil, "", "", errors.New("invalid credentials")
+	}
+
+	if !user.IsEmailVerified() {
+		return nil, "", "", errors.New("email not verified")
+	}
+
+	accessToken, refreshToken, err := s.jwtService.GenerateTokenPair(user)
+	if err != nil {
+		return nil, "", "", err
+	}
+
+	return &user, accessToken, refreshToken, nil
+}
+
+func (s *AuthService) RefreshToken(refreshToken string) (string, string, error) {
+	claims, err := s.jwtService.ValidateToken(refreshToken)
+	if err != nil {
+		return "", "", err
+	}
+
+	// Here you might want to check against DB if user still exists or is banned
+	// Also you could implement token rotation (revoke used refresh token)
+
+	var user models.User
+	// Parse UUID from claims and preload permissions
+	if err := database.DB.Preload("Roles.Permissions").Where("id = ?", claims.UserID).First(&user).Error; err != nil {
+		return "", "", errors.New("user not found")
+	}
+
+	return s.jwtService.GenerateTokenPair(user)
+}
+
+func (s *AuthService) FindOrCreateSocialUser(gothUser goth.User, provider string) (*models.User, string, string, error) {
+	var socialAccount models.SocialAccount
+	var user models.User
+
+	// Check if social account exists
+	err := database.DB.Where("provider = ? AND provider_id = ?", provider, gothUser.UserID).First(&socialAccount).Error
+
+	if err == nil {
+		// Social account exists, get user
+		if err := database.DB.Preload("Roles.Permissions").First(&user, socialAccount.UserID).Error; err != nil {
+			return nil, "", "", err
+		}
+
+		// Update avatar if changed
+		if gothUser.AvatarURL != "" && user.Avatar != gothUser.AvatarURL {
+			database.DB.Model(&user).Update("avatar", gothUser.AvatarURL)
+			user.Avatar = gothUser.AvatarURL
+		}
+	} else if errors.Is(err, gorm.ErrRecordNotFound) {
+		// Check if user with same email exists
+		err := database.DB.Where("email = ?", gothUser.Email).First(&user).Error
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			// Create new user - use name from provider or generate from email
+			username := gothUser.NickName
+			if username == "" {
+				username = gothUser.Name
+			}
+			if username == "" {
+				// Generate username from email (part before @)
+				for i, c := range gothUser.Email {
+					if c == '@' {
+						username = gothUser.Email[:i]
+						break
+					}
+				}
+			}
+
+			// OAuth providers have already verified email; no email verification required
+			trueBool := true
+			user = models.User{
+				UserName:      username,
+				Email:         gothUser.Email,
+				EmailVerified: &trueBool,
+				Avatar:        gothUser.AvatarURL, // Save avatar from OAuth provider
+			}
+			if err := database.DB.Create(&user).Error; err != nil {
+				return nil, "", "", err
+			}
+		} else {
+			// Linking OAuth to existing user: treat as verified and update avatar
+			updates := map[string]interface{}{
+				"email_verified":     true,
+				"email_verify_token": "",
+			}
+			if gothUser.AvatarURL != "" {
+				updates["avatar"] = gothUser.AvatarURL
+			}
+			database.DB.Model(&user).Updates(updates)
+			trueBool := true
+			user.EmailVerified = &trueBool
+			user.EmailVerifyToken = ""
+			if gothUser.AvatarURL != "" {
+				user.Avatar = gothUser.AvatarURL
+			}
+		}
+
+		// Create social account with avatar and name
+		socialAccount = models.SocialAccount{
+			UserID:     user.ID,
+			Provider:   provider,
+			ProviderID: gothUser.UserID,
+			Email:      gothUser.Email,
+			Name:       gothUser.Name,
+			AvatarURL:  gothUser.AvatarURL,
+		}
+		if err := database.DB.Create(&socialAccount).Error; err != nil {
+			return nil, "", "", err
+		}
+
+		// Assign default "user" role
+		var userRole models.Role
+		if err := database.DB.Where("name = ?", "user").First(&userRole).Error; err == nil {
+			database.DB.Model(&user).Association("Roles").Append(&userRole)
+		}
+	} else {
+		return nil, "", "", err
+	}
+
+	// Make sure we have the user with all roles/permissions and social accounts loaded
+	database.DB.Preload("Roles.Permissions").Preload("SocialAccounts").First(&user, user.ID)
+
+	accessToken, refreshToken, err := s.jwtService.GenerateTokenPair(user)
+	if err != nil {
+		return nil, "", "", err
+	}
+
+	return &user, accessToken, refreshToken, nil
+}
+
+func (s *AuthService) GetUserByID(userID string) (*models.User, error) {
+	var user models.User
+	if err := database.DB.Preload("Roles.Permissions").Where("id = ?", userID).First(&user).Error; err != nil {
+		return nil, errors.New("user not found")
+	}
+	return &user, nil
+}
+
+// VerifyEmail marks the user as verified when the token matches. Only for email/password registrations.
+func (s *AuthService) VerifyEmail(token string) error {
+	if token == "" {
+		return errors.New("invalid verification token")
+	}
+	var user models.User
+	if err := database.DB.Where("email_verify_token = ?", token).First(&user).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return errors.New("invalid or expired verification token")
+		}
+		return err
+	}
+	now := time.Now()
+	return database.DB.Model(&user).Updates(map[string]interface{}{
+		"email_verified":     true,
+		"email_verify_token": "",
+		"email_verified_at":  &now,
+	}).Error
+}

internal/services/banner_service.go

@@ -0,0 +1,172 @@
+package services
+
+import (
+	"errors"
+	"strings"
+
+	"gauth-central/internal/database"
+	"gauth-central/internal/models"
+
+	"gorm.io/gorm"
+)
+
+const defaultBannerColor = "#FFFFFF"
+
+type BannerService struct{}
+
+func NewBannerService() *BannerService {
+	return &BannerService{}
+}
+
+// CreateBanner creates a new banner entry.
+func (s *BannerService) CreateBanner(
+	color string,
+	title string,
+	text1 string,
+	text2 string,
+	text4 string,
+	text5 string,
+	image string,
+	imageK string,
+	imageKTxt string,
+	isActive bool,
+) (*models.Banner, error) {
+	color = strings.TrimSpace(color)
+	if color == "" {
+		color = defaultBannerColor
+	}
+
+	banner := models.Banner{
+		Color:     color,
+		Title:     strings.TrimSpace(title),
+		Text1:     strings.TrimSpace(text1),
+		Text2:     strings.TrimSpace(text2),
+		Text4:     strings.TrimSpace(text4),
+		Text5:     strings.TrimSpace(text5),
+		Image:     image,
+		ImageK:    imageK,
+		ImageKTxt: strings.TrimSpace(imageKTxt),
+		IsActive:  isActive,
+	}
+
+	if err := database.DB.Create(&banner).Error; err != nil {
+		return nil, err
+	}
+
+	return s.GetBannerByID(banner.ID.String())
+}
+
+// GetAllBanners retrieves all banners. Use onlyActive to filter public data.
+func (s *BannerService) GetAllBanners(onlyActive bool) ([]models.Banner, error) {
+	var banners []models.Banner
+	query := database.DB.Order("created_at desc")
+	if onlyActive {
+		query = query.Where("is_active = ?", true)
+	}
+
+	if err := query.Find(&banners).Error; err != nil {
+		return nil, err
+	}
+
+	return banners, nil
+}
+
+// GetFirstActiveBanner returns the newest active banner.
+func (s *BannerService) GetFirstActiveBanner() (*models.Banner, error) {
+	var banner models.Banner
+	if err := database.DB.Where("is_active = ?", true).Order("created_at desc").First(&banner).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("banner not found")
+		}
+		return nil, err
+	}
+	return &banner, nil
+}
+
+// GetBannerByID retrieves a banner by ID.
+func (s *BannerService) GetBannerByID(id string) (*models.Banner, error) {
+	var banner models.Banner
+	if err := database.DB.Where("id = ?", id).First(&banner).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("banner not found")
+		}
+		return nil, err
+	}
+	return &banner, nil
+}
+
+// UpdateBanner updates an existing banner entry.
+func (s *BannerService) UpdateBanner(
+	id string,
+	color *string,
+	title *string,
+	text1 *string,
+	text2 *string,
+	text4 *string,
+	text5 *string,
+	image *string,
+	imageK *string,
+	imageKTxt *string,
+	isActive *bool,
+) (*models.Banner, error) {
+	banner, err := s.GetBannerByID(id)
+	if err != nil {
+		return nil, err
+	}
+
+	updates := map[string]interface{}{}
+	if color != nil {
+		clean := strings.TrimSpace(*color)
+		if clean == "" {
+			clean = defaultBannerColor
+		}
+		updates["color"] = clean
+	}
+	if title != nil {
+		updates["title"] = strings.TrimSpace(*title)
+	}
+	if text1 != nil {
+		updates["text1"] = strings.TrimSpace(*text1)
+	}
+	if text2 != nil {
+		updates["text2"] = strings.TrimSpace(*text2)
+	}
+	if text4 != nil {
+		updates["text4"] = strings.TrimSpace(*text4)
+	}
+	if text5 != nil {
+		updates["text5"] = strings.TrimSpace(*text5)
+	}
+	if image != nil {
+		updates["image"] = *image
+	}
+	if imageK != nil {
+		updates["image_k"] = *imageK
+	}
+	if imageKTxt != nil {
+		updates["image_k_txt"] = strings.TrimSpace(*imageKTxt)
+	}
+	if isActive != nil {
+		updates["is_active"] = *isActive
+	}
+
+	if len(updates) > 0 {
+		if err := database.DB.Model(banner).Updates(updates).Error; err != nil {
+			return nil, err
+		}
+	}
+
+	return s.GetBannerByID(id)
+}
+
+// DeleteBanner deletes a banner by ID.
+func (s *BannerService) DeleteBanner(id string) error {
+	result := database.DB.Delete(&models.Banner{}, "id = ?", id)
+	if result.Error != nil {
+		return result.Error
+	}
+	if result.RowsAffected == 0 {
+		return errors.New("banner not found")
+	}
+	return nil
+}

internal/services/cache_service.go

@@ -0,0 +1,204 @@
+package services
+
+import (
+	"encoding/json"
+	"gauth-central/internal/database"
+	"gauth-central/internal/models"
+	"time"
+
+	"github.com/redis/go-redis/v9"
+)
+
+type CacheService struct{}
+
+func NewCacheService() *CacheService {
+	return &CacheService{}
+}
+
+// User Cache
+func (s *CacheService) SetUser(userID string, user *models.User, expiration time.Duration) error {
+	userData, err := json.Marshal(user)
+	if err != nil {
+		return err
+	}
+	return database.Set("user:"+userID, userData, expiration)
+}
+
+func (s *CacheService) GetUser(userID string) (*models.User, error) {
+	data, err := database.Get("user:" + userID)
+	if err != nil {
+		return nil, err
+	}
+
+	var user models.User
+	err = json.Unmarshal([]byte(data), &user)
+	if err != nil {
+		return nil, err
+	}
+
+	return &user, nil
+}
+
+func (s *CacheService) DeleteUser(userID string) error {
+	return database.Delete("user:" + userID)
+}
+
+// Session Management
+func (s *CacheService) SetSession(token string, userID string, expiration time.Duration) error {
+	return database.Set("session:"+token, userID, expiration)
+}
+
+func (s *CacheService) GetSession(token string) (string, error) {
+	return database.Get("session:" + token)
+}
+
+func (s *CacheService) DeleteSession(token string) error {
+	return database.Delete("session:" + token)
+}
+
+// Rate Limiting
+func (s *CacheService) IncrementRateLimit(key string, expiration time.Duration) (int64, error) {
+	count, err := database.Increment("ratelimit:" + key)
+	if err != nil {
+		return 0, err
+	}
+
+	// Set expiration only for first increment
+	if count == 1 {
+		database.Expire("ratelimit:"+key, expiration)
+	}
+
+	return count, nil
+}
+
+func (s *CacheService) GetRateLimit(key string) (string, error) {
+	return database.Get("ratelimit:" + key)
+}
+
+// Token Blacklist (for logout)
+func (s *CacheService) BlacklistToken(token string, expiration time.Duration) error {
+	return database.Set("blacklist:"+token, "1", expiration)
+}
+
+func (s *CacheService) IsTokenBlacklisted(token string) (bool, error) {
+	return database.Exists("blacklist:" + token)
+}
+
+// Email Verification Token Cache
+func (s *CacheService) SetEmailVerification(email string, token string, expiration time.Duration) error {
+	return database.Set("email_verify:"+email, token, expiration)
+}
+
+func (s *CacheService) GetEmailVerification(email string) (string, error) {
+	return database.Get("email_verify:" + email)
+}
+
+func (s *CacheService) DeleteEmailVerification(email string) error {
+	return database.Delete("email_verify:" + email)
+}
+
+// Password Reset Token Cache
+func (s *CacheService) SetPasswordReset(email string, token string, expiration time.Duration) error {
+	return database.Set("password_reset:"+email, token, expiration)
+}
+
+func (s *CacheService) GetPasswordReset(email string) (string, error) {
+	return database.Get("password_reset:" + email)
+}
+
+func (s *CacheService) DeletePasswordReset(email string) error {
+	return database.Delete("password_reset:" + email)
+}
+
+// CORS Whitelist Cache
+func (s *CacheService) SetCorsWhitelist(origins []string, expiration time.Duration) error {
+	data, err := json.Marshal(origins)
+	if err != nil {
+		return err
+	}
+	return database.Set("cors:whitelist", data, expiration)
+}
+
+func (s *CacheService) GetCorsWhitelist() ([]string, error) {
+	data, err := database.Get("cors:whitelist")
+	if err != nil {
+		if err == redis.Nil {
+			return nil, nil
+		}
+		return nil, err
+	}
+
+	var origins []string
+	err = json.Unmarshal([]byte(data), &origins)
+	if err != nil {
+		return nil, err
+	}
+
+	return origins, nil
+}
+
+func (s *CacheService) InvalidateCorsWhitelist() error {
+	return database.Delete("cors:whitelist")
+}
+
+// CORS Blacklist Cache
+func (s *CacheService) SetCorsBlacklist(origins []string, expiration time.Duration) error {
+	data, err := json.Marshal(origins)
+	if err != nil {
+		return err
+	}
+	return database.Set("cors:blacklist", data, expiration)
+}
+
+func (s *CacheService) GetCorsBlacklist() ([]string, error) {
+	data, err := database.Get("cors:blacklist")
+	if err != nil {
+		if err == redis.Nil {
+			return nil, nil
+		}
+		return nil, err
+	}
+
+	var origins []string
+	err = json.Unmarshal([]byte(data), &origins)
+	if err != nil {
+		return nil, err
+	}
+
+	return origins, nil
+}
+
+func (s *CacheService) InvalidateCorsBlacklist() error {
+	return database.Delete("cors:blacklist")
+}
+
+// Rate Limit Settings Cache
+func (s *CacheService) SetRateLimitSettings(settings map[string]*models.RateLimitSetting, expiration time.Duration) error {
+	data, err := json.Marshal(settings)
+	if err != nil {
+		return err
+	}
+	return database.Set("settings:ratelimit", data, expiration)
+}
+
+func (s *CacheService) GetRateLimitSettings() (map[string]*models.RateLimitSetting, error) {
+	data, err := database.Get("settings:ratelimit")
+	if err != nil {
+		if err == redis.Nil {
+			return nil, nil
+		}
+		return nil, err
+	}
+
+	var settings map[string]*models.RateLimitSetting
+	err = json.Unmarshal([]byte(data), &settings)
+	if err != nil {
+		return nil, err
+	}
+
+	return settings, nil
+}
+
+func (s *CacheService) InvalidateRateLimitSettings() error {
+	return database.Delete("settings:ratelimit")
+}

internal/services/contact_service.go

@@ -0,0 +1,95 @@
+package services
+
+import (
+	"errors"
+	"fmt"
+	"gauth-central/internal/database"
+	"gauth-central/internal/models"
+	"gauth-central/pkg/utils"
+
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+type ContactService struct{}
+
+func NewContactService() *ContactService {
+	return &ContactService{}
+}
+
+func (s *ContactService) CreateContact(name, email, subject, message, ip string, userID *string) (*models.Contact, error) {
+	var userUUID *uuid.UUID
+	if userID != nil {
+		parsedUUID, err := uuid.Parse(*userID)
+		if err == nil {
+			userUUID = &parsedUUID
+		}
+	}
+
+	contact := models.Contact{
+		Name:    name,
+		Email:   email,
+		Subject: subject,
+		Message: message,
+		IP:      ip,
+		UserID:  userUUID,
+	}
+
+	if err := database.DB.Create(&contact).Error; err != nil {
+		return nil, err
+	}
+
+	// Send email asynchronously (like Celery task)
+	go func() {
+		// In a real production app, you might want to use a proper task queue here
+		// For now, we'll just use a goroutine
+		err := utils.SendContactEmail(contact.Name, contact.Email, contact.Subject, contact.Message, contact.IP)
+		if err != nil {
+			fmt.Printf("Failed to send contact email: %v\n", err)
+		}
+	}()
+
+	return &contact, nil
+}
+
+// GetAllContacts retrieves all contact messages with pagination
+func (s *ContactService) GetAllContacts(page, limit int) ([]models.Contact, int64, error) {
+	var contacts []models.Contact
+	var total int64
+
+	offset := (page - 1) * limit
+
+	if err := database.DB.Model(&models.Contact{}).Count(&total).Error; err != nil {
+		return nil, 0, err
+	}
+
+	if err := database.DB.Preload("User").Order("created_at desc").Limit(limit).Offset(offset).Find(&contacts).Error; err != nil {
+		return nil, 0, err
+	}
+
+	return contacts, total, nil
+}
+
+// GetContactByID retrieves a single contact message by ID
+func (s *ContactService) GetContactByID(id string) (*models.Contact, error) {
+	var contact models.Contact
+	if err := database.DB.Preload("User").Where("id = ?", id).First(&contact).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("contact not found")
+		}
+		return nil, err
+	}
+	return &contact, nil
+}
+
+// DeleteContact deletes a contact message by ID
+func (s *ContactService) DeleteContact(id string) error {
+	result := database.DB.Delete(&models.Contact{}, "id = ?", id)
+	if result.Error != nil {
+		return result.Error
+	}
+	if result.RowsAffected == 0 {
+		return errors.New("contact not found")
+	}
+	return nil
+}

internal/services/education_service.go

@@ -0,0 +1,103 @@
+package services
+
+import (
+	"errors"
+
+	"gauth-central/internal/database"
+	"gauth-central/internal/models"
+
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+type EducationService struct{}
+
+func NewEducationService() *EducationService {
+	return &EducationService{}
+}
+
+func (s *EducationService) GetAllEducations(resumeID *string, onlyActive bool) ([]models.Education, error) {
+	var items []models.Education
+	query := database.DB.Order("created_at desc")
+
+	if resumeID != nil {
+		query = query.Where("resume_id = ?", *resumeID)
+	}
+
+	if onlyActive {
+		query = query.Where("is_active = ?", true)
+	}
+
+	if err := query.Find(&items).Error; err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
+func (s *EducationService) GetEducationByID(id string) (*models.Education, error) {
+	var item models.Education
+	if err := database.DB.Where("id = ?", id).First(&item).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("education not found")
+		}
+		return nil, err
+	}
+	return &item, nil
+}
+
+func (s *EducationService) CreateEducation(betweenYears, title, content string, resumeID *uuid.UUID, isActive bool) (*models.Education, error) {
+	item := models.Education{
+		BetweenYears: betweenYears,
+		Title:        title,
+		Content:      content,
+		ResumeID:     resumeID,
+		IsActive:     isActive,
+	}
+
+	if err := database.DB.Create(&item).Error; err != nil {
+		return nil, err
+	}
+	return &item, nil
+}
+
+func (s *EducationService) UpdateEducation(id string, betweenYears, title, content *string, resumeID *uuid.UUID, isActive *bool) (*models.Education, error) {
+	item, err := s.GetEducationByID(id)
+	if err != nil {
+		return nil, err
+	}
+
+	updates := map[string]interface{}{}
+	if betweenYears != nil {
+		updates["between_years"] = *betweenYears
+	}
+	if title != nil {
+		updates["title"] = *title
+	}
+	if content != nil {
+		updates["content"] = *content
+	}
+	if resumeID != nil {
+		updates["resume_id"] = *resumeID
+	}
+	if isActive != nil {
+		updates["is_active"] = *isActive
+	}
+
+	if len(updates) > 0 {
+		if err := database.DB.Model(item).Updates(updates).Error; err != nil {
+			return nil, err
+		}
+	}
+	return s.GetEducationByID(id)
+}
+
+func (s *EducationService) DeleteEducation(id string) error {
+	result := database.DB.Delete(&models.Education{}, "id = ?", id)
+	if result.Error != nil {
+		return result.Error
+	}
+	if result.RowsAffected == 0 {
+		return errors.New("education not found")
+	}
+	return nil
+}

internal/services/experience_service.go

@@ -0,0 +1,103 @@
+package services
+
+import (
+	"errors"
+
+	"gauth-central/internal/database"
+	"gauth-central/internal/models"
+
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+type ExperienceService struct{}
+
+func NewExperienceService() *ExperienceService {
+	return &ExperienceService{}
+}
+
+func (s *ExperienceService) GetAllExperiences(resumeID *string, onlyActive bool) ([]models.Experience, error) {
+	var items []models.Experience
+	query := database.DB.Order("created_at desc")
+
+	if resumeID != nil {
+		query = query.Where("resume_id = ?", *resumeID)
+	}
+
+	if onlyActive {
+		query = query.Where("is_active = ?", true)
+	}
+
+	if err := query.Find(&items).Error; err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
+func (s *ExperienceService) GetExperienceByID(id string) (*models.Experience, error) {
+	var item models.Experience
+	if err := database.DB.Where("id = ?", id).First(&item).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("experience not found")
+		}
+		return nil, err
+	}
+	return &item, nil
+}
+
+func (s *ExperienceService) CreateExperience(betweenYears, title, content string, resumeID *uuid.UUID, isActive bool) (*models.Experience, error) {
+	item := models.Experience{
+		BetweenYears: betweenYears,
+		Title:        title,
+		Content:      content,
+		ResumeID:     resumeID,
+		IsActive:     isActive,
+	}
+
+	if err := database.DB.Create(&item).Error; err != nil {
+		return nil, err
+	}
+	return &item, nil
+}
+
+func (s *ExperienceService) UpdateExperience(id string, betweenYears, title, content *string, resumeID *uuid.UUID, isActive *bool) (*models.Experience, error) {
+	item, err := s.GetExperienceByID(id)
+	if err != nil {
+		return nil, err
+	}
+
+	updates := map[string]interface{}{}
+	if betweenYears != nil {
+		updates["between_years"] = *betweenYears
+	}
+	if title != nil {
+		updates["title"] = *title
+	}
+	if content != nil {
+		updates["content"] = *content
+	}
+	if resumeID != nil {
+		updates["resume_id"] = *resumeID
+	}
+	if isActive != nil {
+		updates["is_active"] = *isActive
+	}
+
+	if len(updates) > 0 {
+		if err := database.DB.Model(item).Updates(updates).Error; err != nil {
+			return nil, err
+		}
+	}
+	return s.GetExperienceByID(id)
+}
+
+func (s *ExperienceService) DeleteExperience(id string) error {
+	result := database.DB.Delete(&models.Experience{}, "id = ?", id)
+	if result.Error != nil {
+		return result.Error
+	}
+	if result.RowsAffected == 0 {
+		return errors.New("experience not found")
+	}
+	return nil
+}

internal/services/home_service.go

@@ -0,0 +1,263 @@
+package services
+
+import (
+	"errors"
+	"fmt"
+	"regexp"
+	"strings"
+
+	"gauth-central/internal/database"
+	"gauth-central/internal/models"
+
+	"gorm.io/gorm"
+)
+
+const defaultHomeVideoURL = "https://www.youtube.com/watch?v=6zM4p_A0ISk"
+
+type HomeService struct{}
+
+func NewHomeService() *HomeService {
+	return &HomeService{}
+}
+
+// CreateHome creates a new home entry with optional tag relations.
+func (s *HomeService) CreateHome(
+	name string,
+	title string,
+	button1 string,
+	button2 string,
+	video string,
+	keywords string,
+	image string,
+	tagIDs []string,
+	isActive bool,
+) (*models.Home, error) {
+	if strings.TrimSpace(video) == "" {
+		video = defaultHomeVideoURL
+	}
+
+	slug := s.generateUniqueSlug(slugify(name), "")
+
+	home := models.Home{
+		Name:     name,
+		Title:    title,
+		Button1:  button1,
+		Button2:  button2,
+		Video:    video,
+		Keywords: keywords,
+		Image:    image,
+		Slug:     slug,
+		IsActive: isActive,
+	}
+
+	if len(tagIDs) > 0 {
+		tags, err := s.fetchTagsByIDs(tagIDs)
+		if err != nil {
+			return nil, err
+		}
+		home.Tags = tags
+	}
+
+	if err := database.DB.Create(&home).Error; err != nil {
+		return nil, err
+	}
+
+	return s.GetHomeByID(home.ID.String())
+}
+
+// GetAllHomes retrieves all homes. Use onlyActive to filter public data.
+func (s *HomeService) GetAllHomes(onlyActive bool) ([]models.Home, error) {
+	var homes []models.Home
+	query := database.DB.Preload("Tags").Order("created_at desc")
+	if onlyActive {
+		query = query.Where("is_active = ?", true)
+	}
+
+	if err := query.Find(&homes).Error; err != nil {
+		return nil, err
+	}
+
+	return homes, nil
+}
+
+// GetHomeByID retrieves a home by ID.
+func (s *HomeService) GetHomeByID(id string) (*models.Home, error) {
+	var home models.Home
+	if err := database.DB.Preload("Tags").Where("id = ?", id).First(&home).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("home not found")
+		}
+		return nil, err
+	}
+	return &home, nil
+}
+
+// GetHomeBySlug retrieves a home by slug. Use onlyActive to limit public access.
+func (s *HomeService) GetHomeBySlug(slug string, onlyActive bool) (*models.Home, error) {
+	var home models.Home
+	query := database.DB.Preload("Tags").Where("slug = ?", slug)
+	if onlyActive {
+		query = query.Where("is_active = ?", true)
+	}
+
+	if err := query.First(&home).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("home not found")
+		}
+		return nil, err
+	}
+
+	return &home, nil
+}
+
+// UpdateHome updates an existing home entry and its tag relations.
+func (s *HomeService) UpdateHome(
+	id string,
+	name *string,
+	title *string,
+	button1 *string,
+	button2 *string,
+	video *string,
+	keywords *string,
+	image *string,
+	slug *string,
+	tagIDs *[]string,
+	isActive *bool,
+) (*models.Home, error) {
+	home, err := s.GetHomeByID(id)
+	if err != nil {
+		return nil, err
+	}
+
+	updates := map[string]interface{}{}
+	if name != nil {
+		updates["name"] = *name
+	}
+	if title != nil {
+		updates["title"] = *title
+	}
+	if button1 != nil {
+		updates["button1"] = *button1
+	}
+	if button2 != nil {
+		updates["button2"] = *button2
+	}
+	if video != nil {
+		updates["video"] = *video
+	}
+	if keywords != nil {
+		updates["keywords"] = *keywords
+	}
+	if image != nil {
+		updates["image"] = *image
+	}
+	if slug != nil {
+		clean := slugify(*slug)
+		if clean == "" {
+			return nil, errors.New("slug cannot be empty")
+		}
+		if s.slugExists(clean, id) {
+			return nil, errors.New("slug already exists")
+		}
+		updates["slug"] = clean
+	}
+	if isActive != nil {
+		updates["is_active"] = *isActive
+	}
+
+	if len(updates) > 0 {
+		if err := database.DB.Model(home).Updates(updates).Error; err != nil {
+			return nil, err
+		}
+	}
+
+	if tagIDs != nil {
+		tags, err := s.fetchTagsByIDs(*tagIDs)
+		if err != nil {
+			return nil, err
+		}
+		if err := database.DB.Model(home).Association("Tags").Replace(tags); err != nil {
+			return nil, err
+		}
+	}
+
+	return s.GetHomeByID(id)
+}
+
+// DeleteHome deletes a home by ID.
+func (s *HomeService) DeleteHome(id string) error {
+	result := database.DB.Delete(&models.Home{}, "id = ?", id)
+	if result.Error != nil {
+		return result.Error
+	}
+	if result.RowsAffected == 0 {
+		return errors.New("home not found")
+	}
+	return nil
+}
+
+func (s *HomeService) fetchTagsByIDs(tagIDs []string) ([]models.Tag, error) {
+	var tags []models.Tag
+	if len(tagIDs) == 0 {
+		return tags, nil
+	}
+
+	if err := database.DB.Where("id IN ?", tagIDs).Find(&tags).Error; err != nil {
+		return nil, err
+	}
+	if len(tags) != len(tagIDs) {
+		return nil, errors.New("one or more tags not found")
+	}
+	return tags, nil
+}
+
+func (s *HomeService) generateUniqueSlug(baseSlug string, excludeID string) string {
+	slug := baseSlug
+	counter := 1
+	for s.slugExists(slug, excludeID) {
+		slug = fmt.Sprintf("%s-%d", baseSlug, counter)
+		counter++
+	}
+	return slug
+}
+
+func (s *HomeService) slugExists(slug string, excludeID string) bool {
+	var count int64
+	query := database.DB.Model(&models.Home{}).Where("slug = ?", slug)
+	if excludeID != "" {
+		query = query.Where("id <> ?", excludeID)
+	}
+	query.Count(&count)
+	return count > 0
+}
+
+func slugify(input string) string {
+	clean := strings.TrimSpace(input)
+	if clean == "" {
+		return ""
+	}
+
+	replacer := strings.NewReplacer(
+		"ı", "i",
+		"İ", "i",
+		"ş", "s",
+		"Ş", "s",
+		"ğ", "g",
+		"Ğ", "g",
+		"ç", "c",
+		"Ç", "c",
+		"ö", "o",
+		"Ö", "o",
+		"ü", "u",
+		"Ü", "u",
+	)
+
+	clean = strings.ToLower(replacer.Replace(clean))
+	re := regexp.MustCompile(`[^a-z0-9]+`)
+	clean = re.ReplaceAllString(clean, "-")
+	clean = strings.Trim(clean, "-")
+	if clean == "" {
+		return "home"
+	}
+	return clean
+}

internal/services/jwt_service.go

@@ -0,0 +1,146 @@
+package services
+
+import (
+	"errors"
+	"time"
+
+	"gauth-central/config"
+	"gauth-central/internal/models"
+
+	"github.com/golang-jwt/jwt/v5"
+)
+
+type JWTClaim struct {
+	UserID      string   `json:"sub"`
+	Email       string   `json:"email"`
+	Permissions []string `json:"permissions,omitempty"`
+	jwt.RegisteredClaims
+}
+
+type JWTService struct{}
+
+func NewJWTService() *JWTService {
+	return &JWTService{}
+}
+
+func (s *JWTService) GenerateToken(user models.User) (string, error) {
+	expirationTime := time.Now().Add(24 * time.Hour)
+	claims := &JWTClaim{
+		UserID: user.ID.String(),
+		Email:  user.Email,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(expirationTime),
+			Issuer:    "gauth-central",
+			IssuedAt:  jwt.NewNumericDate(time.Now()),
+		},
+	}
+
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString([]byte(config.AppConfig.JWTSecret))
+}
+
+func (s *JWTService) GenerateTokenPair(user models.User) (string, string, error) {
+	// Extract permissions
+	permissionMap := make(map[string]bool)
+	for _, role := range user.Roles {
+		for _, perm := range role.Permissions {
+			permissionMap[perm.Name] = true
+		}
+	}
+	var permissions []string
+	for p := range permissionMap {
+		permissions = append(permissions, p)
+	}
+
+	// Access Token (15 min)
+	accessTokenExp := time.Now().Add(15 * time.Minute)
+	accessClaims := &JWTClaim{
+		UserID:      user.ID.String(),
+		Email:       user.Email,
+		Permissions: permissions,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(accessTokenExp),
+			Issuer:    "gauth-central",
+			IssuedAt:  jwt.NewNumericDate(time.Now()),
+		},
+	}
+	accessToken := jwt.NewWithClaims(jwt.SigningMethodHS256, accessClaims)
+	signedAccessToken, err := accessToken.SignedString([]byte(config.AppConfig.JWTSecret))
+	if err != nil {
+		return "", "", err
+	}
+
+	// Refresh Token (7 days)
+	refreshTokenExp := time.Now().Add(7 * 24 * time.Hour)
+	refreshClaims := &JWTClaim{
+		UserID:      user.ID.String(),
+		Email:       user.Email,
+		Permissions: nil, // Refresh token doesn't need permissions usually, or keep them if needed
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(refreshTokenExp),
+			Issuer:    "gauth-central",
+			IssuedAt:  jwt.NewNumericDate(time.Now()),
+		},
+	}
+	refreshToken := jwt.NewWithClaims(jwt.SigningMethodHS256, refreshClaims)
+	signedRefreshToken, err := refreshToken.SignedString([]byte(config.AppConfig.JWTSecret))
+	if err != nil {
+		return "", "", err
+	}
+
+	return signedAccessToken, signedRefreshToken, nil
+}
+
+func (s *JWTService) ValidateToken(signedToken string) (*JWTClaim, error) {
+	token, err := jwt.ParseWithClaims(
+		signedToken,
+		&JWTClaim{},
+		func(token *jwt.Token) (interface{}, error) {
+			if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
+				return nil, errors.New("unexpected signing method")
+			}
+			return []byte(config.AppConfig.JWTSecret), nil
+		},
+	)
+
+	if err != nil {
+		return nil, err
+	}
+
+	claims, ok := token.Claims.(*JWTClaim)
+	if !ok {
+		return nil, errors.New("could not parse claims")
+	}
+
+	if claims.ExpiresAt.Time.Before(time.Now()) {
+		return nil, errors.New("token expired")
+	}
+
+	return claims, nil
+}
+
+// GenerateVerificationToken generates a JWT token for email verification (24 hours expiry)
+func (s *JWTService) GenerateVerificationToken(userID, email string) (string, error) {
+	expirationTime := time.Now().Add(24 * time.Hour)
+	claims := &JWTClaim{
+		UserID: userID,
+		Email:  email,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(expirationTime),
+			Issuer:    "gauth-central",
+			IssuedAt:  jwt.NewNumericDate(time.Now()),
+		},
+	}
+
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString([]byte(config.AppConfig.JWTSecret))
+}
+
+// ValidateVerificationToken validates a verification token and returns user ID and email
+func (s *JWTService) ValidateVerificationToken(tokenString string) (string, string, error) {
+	claims, err := s.ValidateToken(tokenString)
+	if err != nil {
+		return "", "", err
+	}
+	return claims.UserID, claims.Email, nil
+}

internal/services/knowledge_service.go

@@ -0,0 +1,95 @@
+package services
+
+import (
+	"errors"
+
+	"gauth-central/internal/database"
+	"gauth-central/internal/models"
+
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+type KnowledgeService struct{}
+
+func NewKnowledgeService() *KnowledgeService {
+	return &KnowledgeService{}
+}
+
+func (s *KnowledgeService) GetAllKnowledges(resumeID *string, onlyActive bool) ([]models.Knowledge, error) {
+	var items []models.Knowledge
+	query := database.DB.Order("created_at desc")
+
+	if resumeID != nil {
+		query = query.Where("resume_id = ?", *resumeID)
+	}
+
+	if onlyActive {
+		query = query.Where("is_active = ?", true)
+	}
+
+	if err := query.Find(&items).Error; err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
+func (s *KnowledgeService) GetKnowledgeByID(id string) (*models.Knowledge, error) {
+	var item models.Knowledge
+	if err := database.DB.Where("id = ?", id).First(&item).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("knowledge not found")
+		}
+		return nil, err
+	}
+	return &item, nil
+}
+
+func (s *KnowledgeService) CreateKnowledge(title string, resumeID *uuid.UUID, isActive bool) (*models.Knowledge, error) {
+	item := models.Knowledge{
+		Title:    title,
+		ResumeID: resumeID,
+		IsActive: isActive,
+	}
+
+	if err := database.DB.Create(&item).Error; err != nil {
+		return nil, err
+	}
+	return &item, nil
+}
+
+func (s *KnowledgeService) UpdateKnowledge(id string, title *string, resumeID *uuid.UUID, isActive *bool) (*models.Knowledge, error) {
+	item, err := s.GetKnowledgeByID(id)
+	if err != nil {
+		return nil, err
+	}
+
+	updates := map[string]interface{}{}
+	if title != nil {
+		updates["title"] = *title
+	}
+	if resumeID != nil {
+		updates["resume_id"] = *resumeID
+	}
+	if isActive != nil {
+		updates["is_active"] = *isActive
+	}
+
+	if len(updates) > 0 {
+		if err := database.DB.Model(item).Updates(updates).Error; err != nil {
+			return nil, err
+		}
+	}
+	return s.GetKnowledgeByID(id)
+}
+
+func (s *KnowledgeService) DeleteKnowledge(id string) error {
+	result := database.DB.Delete(&models.Knowledge{}, "id = ?", id)
+	if result.Error != nil {
+		return result.Error
+	}
+	if result.RowsAffected == 0 {
+		return errors.New("knowledge not found")
+	}
+	return nil
+}

internal/services/main_menu_service.go

@@ -0,0 +1,134 @@
+package services
+
+import (
+	"errors"
+
+	"gauth-central/internal/database"
+	"gauth-central/internal/models"
+
+	"gorm.io/gorm"
+)
+
+type MainMenuService struct{}
+
+func NewMainMenuService() *MainMenuService {
+	return &MainMenuService{}
+}
+
+// CreateMainMenu creates a new main menu entry.
+func (s *MainMenuService) CreateMainMenu(home string, about string, services string, resume string, portfolio string, contact string, isActive bool) (*models.MainMenu, error) {
+	item := models.MainMenu{
+		Home:      home,
+		About:     about,
+		Services:  services,
+		Resume:    resume,
+		Portfolio: portfolio,
+		Contact:   contact,
+		IsActive:  isActive,
+	}
+
+	if err := database.DB.Create(&item).Error; err != nil {
+		return nil, err
+	}
+
+	return s.GetMainMenuByID(item.ID.String())
+}
+
+// GetAllMainMenus retrieves all main menu entries. Use onlyActive to filter public data.
+func (s *MainMenuService) GetAllMainMenus(onlyActive bool) ([]models.MainMenu, error) {
+	var items []models.MainMenu
+	query := database.DB.Order("created_at desc")
+	if onlyActive {
+		query = query.Where("is_active = ?", true)
+	}
+
+	if err := query.Find(&items).Error; err != nil {
+		return nil, err
+	}
+
+	return items, nil
+}
+
+// GetFirstActiveMainMenu returns the newest active main menu entry.
+func (s *MainMenuService) GetFirstActiveMainMenu() (*models.MainMenu, error) {
+	var item models.MainMenu
+	if err := database.DB.Where("is_active = ?", true).Order("created_at desc").First(&item).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("main menu not found")
+		}
+		return nil, err
+	}
+	return &item, nil
+}
+
+// GetMainMenuByID retrieves a main menu entry by ID.
+func (s *MainMenuService) GetMainMenuByID(id string) (*models.MainMenu, error) {
+	var item models.MainMenu
+	if err := database.DB.Where("id = ?", id).First(&item).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("main menu not found")
+		}
+		return nil, err
+	}
+	return &item, nil
+}
+
+// UpdateMainMenu updates an existing main menu entry.
+func (s *MainMenuService) UpdateMainMenu(
+	id string,
+	home *string,
+	about *string,
+	services *string,
+	resume *string,
+	portfolio *string,
+	contact *string,
+	isActive *bool,
+) (*models.MainMenu, error) {
+	item, err := s.GetMainMenuByID(id)
+	if err != nil {
+		return nil, err
+	}
+
+	updates := map[string]interface{}{}
+	if home != nil {
+		updates["home"] = *home
+	}
+	if about != nil {
+		updates["about"] = *about
+	}
+	if services != nil {
+		updates["services"] = *services
+	}
+	if resume != nil {
+		updates["resume"] = *resume
+	}
+	if portfolio != nil {
+		updates["portfolio"] = *portfolio
+	}
+	if contact != nil {
+		updates["contact"] = *contact
+	}
+	if isActive != nil {
+		updates["is_active"] = *isActive
+	}
+
+	if len(updates) > 0 {
+		if err := database.DB.Model(item).Updates(updates).Error; err != nil {
+			return nil, err
+		}
+	}
+
+	return s.GetMainMenuByID(id)
+}
+
+// DeleteMainMenu deletes a main menu entry by ID.
+func (s *MainMenuService) DeleteMainMenu(id string) error {
+	result := database.DB.Delete(&models.MainMenu{}, "id = ?", id)
+	if result.Error != nil {
+		return result.Error
+	}
+	if result.RowsAffected == 0 {
+		return errors.New("main menu not found")
+	}
+	return nil
+}

internal/services/post_category_service.go

@@ -0,0 +1,214 @@
+package services
+
+import (
+	"errors"
+	"fmt"
+	"regexp"
+	"strings"
+
+	"gauth-central/internal/database"
+	"gauth-central/internal/models"
+
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+type PostCategoryService struct{}
+
+func NewPostCategoryService() *PostCategoryService {
+	return &PostCategoryService{}
+}
+
+func (s *PostCategoryService) CreatePostCategory(
+	title string,
+	keywords string,
+	description string,
+	image string,
+	order int,
+	parentID *uuid.UUID,
+	isActive bool,
+) (*models.PostCategory, error) {
+	slug := s.generateUniqueSlug(slugifyPostCategory(title), "")
+	if slug == "" {
+		return nil, errors.New("slug cannot be empty")
+	}
+
+	category := models.PostCategory{
+		Title:       title,
+		Keywords:    keywords,
+		Description: description,
+		Image:       image,
+		Order:       order,
+		ParentID:    parentID,
+		Slug:        slug,
+		IsActive:    isActive,
+	}
+
+	if err := database.DB.Create(&category).Error; err != nil {
+		return nil, err
+	}
+
+	return s.GetPostCategoryByID(category.ID.String())
+}
+
+func (s *PostCategoryService) GetAllPostCategories(onlyActive bool) ([]models.PostCategory, error) {
+	var categories []models.PostCategory
+	query := database.DB.Order("\"order\" asc").Preload("Children").Where("parent_id IS NULL")
+	if onlyActive {
+		query = query.Where("is_active = ?", true)
+	}
+
+	if err := query.Find(&categories).Error; err != nil {
+		return nil, err
+	}
+
+	return categories, nil
+}
+
+func (s *PostCategoryService) GetPostCategoryByID(id string) (*models.PostCategory, error) {
+	var category models.PostCategory
+	if err := database.DB.Preload("Children").Where("id = ?", id).First(&category).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("post category not found")
+		}
+		return nil, err
+	}
+	return &category, nil
+}
+
+func (s *PostCategoryService) GetPostCategoryBySlug(slug string, onlyActive bool) (*models.PostCategory, error) {
+	var category models.PostCategory
+	query := database.DB.Preload("Children").Where("slug = ?", slug)
+	if onlyActive {
+		query = query.Where("is_active = ?", true)
+	}
+
+	if err := query.First(&category).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("post category not found")
+		}
+		return nil, err
+	}
+	return &category, nil
+}
+
+func (s *PostCategoryService) UpdatePostCategory(
+	id string,
+	title *string,
+	keywords *string,
+	description *string,
+	image *string,
+	order *int,
+	parentID *uuid.UUID,
+	parentIDSet bool,
+	slug *string,
+	isActive *bool,
+) (*models.PostCategory, error) {
+	category, err := s.GetPostCategoryByID(id)
+	if err != nil {
+		return nil, err
+	}
+
+	updates := map[string]interface{}{}
+	if title != nil {
+		updates["title"] = *title
+	}
+	if keywords != nil {
+		updates["keywords"] = *keywords
+	}
+	if description != nil {
+		updates["description"] = *description
+	}
+	if image != nil {
+		updates["image"] = *image
+	}
+	if order != nil {
+		updates["order"] = *order
+	}
+	if parentIDSet {
+		updates["parent_id"] = parentID
+	}
+	if slug != nil {
+		clean := slugifyPostCategory(*slug)
+		if clean == "" {
+			return nil, errors.New("slug cannot be empty")
+		}
+		if s.slugExists(clean, id) {
+			return nil, errors.New("slug already exists")
+		}
+		updates["slug"] = clean
+	}
+	if isActive != nil {
+		updates["is_active"] = *isActive
+	}
+
+	if len(updates) > 0 {
+		if err := database.DB.Model(category).Updates(updates).Error; err != nil {
+			return nil, err
+		}
+	}
+
+	return s.GetPostCategoryByID(id)
+}
+
+func (s *PostCategoryService) DeletePostCategory(id string) error {
+	result := database.DB.Delete(&models.PostCategory{}, "id = ?", id)
+	if result.Error != nil {
+		return result.Error
+	}
+	if result.RowsAffected == 0 {
+		return errors.New("post category not found")
+	}
+	return nil
+}
+
+func (s *PostCategoryService) generateUniqueSlug(baseSlug string, excludeID string) string {
+	slug := baseSlug
+	counter := 1
+	for s.slugExists(slug, excludeID) {
+		slug = fmt.Sprintf("%s-%d", baseSlug, counter)
+		counter++
+	}
+	return slug
+}
+
+func (s *PostCategoryService) slugExists(slug string, excludeID string) bool {
+	var count int64
+	query := database.DB.Model(&models.PostCategory{}).Where("slug = ?", slug)
+	if excludeID != "" {
+		query = query.Where("id <> ?", excludeID)
+	}
+	query.Count(&count)
+	return count > 0
+}
+
+func slugifyPostCategory(input string) string {
+	clean := strings.TrimSpace(input)
+	if clean == "" {
+		return ""
+	}
+
+	replacer := strings.NewReplacer(
+		"ı", "i",
+		"İ", "i",
+		"ş", "s",
+		"Ş", "s",
+		"ğ", "g",
+		"Ğ", "g",
+		"ç", "c",
+		"Ç", "c",
+		"ö", "o",
+		"Ö", "o",
+		"ü", "u",
+		"Ü", "u",
+	)
+
+	clean = strings.ToLower(replacer.Replace(clean))
+	re := regexp.MustCompile(`[^a-z0-9]+`)
+	clean = re.ReplaceAllString(clean, "-")
+	clean = strings.Trim(clean, "-")
+	if clean == "" {
+		return "category"
+	}
+	return clean
+}

internal/services/post_category_view_service.go

@@ -0,0 +1,65 @@
+package services
+
+import (
+	"errors"
+	"time"
+
+	"gauth-central/internal/database"
+	"gauth-central/internal/models"
+
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+type PostCategoryViewService struct{}
+
+func NewPostCategoryViewService() *PostCategoryViewService {
+	return &PostCategoryViewService{}
+}
+
+// TrackView records a category view once per day per IP.
+func (s *PostCategoryViewService) TrackView(categoryID string, ipAddress string, userAgent string) (*models.PostCategoryView, error) {
+	categoryUUID, err := uuid.Parse(categoryID)
+	if err != nil {
+		return nil, errors.New("invalid category_id")
+	}
+
+	startOfDay := time.Now().UTC().Truncate(24 * time.Hour)
+	endOfDay := startOfDay.Add(24 * time.Hour)
+
+	var existing models.PostCategoryView
+	err = database.DB.Where(
+		"category_id = ? AND ip_address = ? AND created_at >= ? AND created_at < ?",
+		categoryUUID,
+		ipAddress,
+		startOfDay,
+		endOfDay,
+	).First(&existing).Error
+	if err == nil {
+		return &existing, nil
+	}
+	if !errors.Is(err, gorm.ErrRecordNotFound) {
+		return nil, err
+	}
+
+	view := models.PostCategoryView{
+		CategoryID: categoryUUID,
+		IPAddress:  ipAddress,
+		UserAgent:  userAgent,
+	}
+
+	if err := database.DB.Create(&view).Error; err != nil {
+		return nil, err
+	}
+
+	return &view, nil
+}
+
+// GetViewsByCategory returns all views for a category.
+func (s *PostCategoryViewService) GetViewsByCategory(categoryID string) ([]models.PostCategoryView, error) {
+	var views []models.PostCategoryView
+	if err := database.DB.Where("category_id = ?", categoryID).Order("created_at desc").Find(&views).Error; err != nil {
+		return nil, err
+	}
+	return views, nil
+}

internal/services/post_comment_service.go

@@ -0,0 +1,200 @@
+package services
+
+
+import (
+	"errors"
+	"fmt"
+	"regexp"
+	"strings"
+
+	"gauth-central/internal/database"
+	"gauth-central/internal/models"
+
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+type PostCommentService struct{}
+
+func NewPostCommentService() *PostCommentService {
+	return &PostCommentService{}
+}
+
+func (s *PostCommentService) CreatePostComment(
+	userID uuid.UUID,
+	postID uuid.UUID,
+	title string,
+	body string,
+	parentID *uuid.UUID,
+	isActive bool,
+) (*models.PostComment, error) {
+	slug := s.generateUniqueSlug(slugifyPostComment(title), "")
+	if slug == "" {
+		return nil, errors.New("slug cannot be empty")
+	}
+
+	comment := models.PostComment{
+		UserID:   userID,
+		PostID:   postID,
+		Title:    title,
+		Body:     body,
+		ParentID: parentID,
+		Slug:     slug,
+		IsActive: isActive,
+	}
+
+	if err := database.DB.Create(&comment).Error; err != nil {
+		return nil, err
+	}
+
+	return s.GetPostCommentByID(comment.ID.String())
+}
+
+func (s *PostCommentService) GetPostCommentsByPostID(postID string, onlyActive bool) ([]models.PostComment, error) {
+	var comments []models.PostComment
+	query := database.DB.Preload("User").Where("post_id = ?", postID).Order("created_at desc")
+	if onlyActive {
+		query = query.Where("is_active = ?", true)
+	}
+
+	if err := query.Find(&comments).Error; err != nil {
+		return nil, err
+	}
+	return comments, nil
+}
+
+func (s *PostCommentService) GetAllPostComments(postID *string, onlyActive bool) ([]models.PostComment, error) {
+	var comments []models.PostComment
+	query := database.DB.Preload("User").Order("created_at desc")
+	if postID != nil {
+		query = query.Where("post_id = ?", *postID)
+	}
+	if onlyActive {
+		query = query.Where("is_active = ?", true)
+	}
+
+	if err := query.Find(&comments).Error; err != nil {
+		return nil, err
+	}
+	return comments, nil
+}
+
+func (s *PostCommentService) GetPostCommentByID(id string) (*models.PostComment, error) {
+	var comment models.PostComment
+	if err := database.DB.Preload("User").Where("id = ?", id).First(&comment).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("post comment not found")
+		}
+		return nil, err
+	}
+	return &comment, nil
+}
+
+func (s *PostCommentService) UpdatePostComment(
+	id string,
+	title *string,
+	body *string,
+	parentID *uuid.UUID,
+	parentIDSet bool,
+	slug *string,
+	isActive *bool,
+) (*models.PostComment, error) {
+	comment, err := s.GetPostCommentByID(id)
+	if err != nil {
+		return nil, err
+	}
+
+	updates := map[string]interface{}{}
+	if title != nil {
+		updates["title"] = *title
+	}
+	if body != nil {
+		updates["body"] = *body
+	}
+	if parentIDSet {
+		updates["parent_id"] = parentID
+	}
+	if slug != nil {
+		clean := slugifyPostComment(*slug)
+		if clean == "" {
+			return nil, errors.New("slug cannot be empty")
+		}
+		if s.slugExists(clean, id) {
+			return nil, errors.New("slug already exists")
+		}
+		updates["slug"] = clean
+	}
+	if isActive != nil {
+		updates["is_active"] = *isActive
+	}
+
+	if len(updates) > 0 {
+		if err := database.DB.Model(comment).Updates(updates).Error; err != nil {
+			return nil, err
+		}
+	}
+
+	return s.GetPostCommentByID(id)
+}
+
+func (s *PostCommentService) DeletePostComment(id string) error {
+	result := database.DB.Delete(&models.PostComment{}, "id = ?", id)
+	if result.Error != nil {
+		return result.Error
+	}
+	if result.RowsAffected == 0 {
+		return errors.New("post comment not found")
+	}
+	return nil
+}
+
+func (s *PostCommentService) generateUniqueSlug(baseSlug string, excludeID string) string {
+	slug := baseSlug
+	counter := 1
+	for s.slugExists(slug, excludeID) {
+		slug = fmt.Sprintf("%s-%d", baseSlug, counter)
+		counter++
+	}
+	return slug
+}
+
+func (s *PostCommentService) slugExists(slug string, excludeID string) bool {
+	var count int64
+	query := database.DB.Model(&models.PostComment{}).Where("slug = ?", slug)
+	if excludeID != "" {
+		query = query.Where("id <> ?", excludeID)
+	}
+	query.Count(&count)
+	return count > 0
+}
+
+func slugifyPostComment(input string) string {
+	clean := strings.TrimSpace(input)
+	if clean == "" {
+		return ""
+	}
+
+	replacer := strings.NewReplacer(
+		"ı", "i",
+		"İ", "i",
+		"ş", "s",
+		"Ş", "s",
+		"ğ", "g",
+		"Ğ", "g",
+		"ç", "c",
+		"Ç", "c",
+		"ö", "o",
+		"Ö", "o",
+		"ü", "u",
+		"Ü", "u",
+	)
+
+	clean = strings.ToLower(replacer.Replace(clean))
+	re := regexp.MustCompile(`[^a-z0-9]+`)
+	clean = re.ReplaceAllString(clean, "-")
+	clean = strings.Trim(clean, "-")
+	if clean == "" {
+		return "comment"
+	}
+	return clean
+}

internal/services/post_service.go

@@ -0,0 +1,297 @@
+package services
+
+import (
+	"errors"
+	"fmt"
+	"regexp"
+	"strings"
+
+	"gauth-central/internal/database"
+	"gauth-central/internal/models"
+
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+type PostService struct{}
+
+func NewPostService() *PostService {
+	return &PostService{}
+}
+
+func (s *PostService) CreatePost(
+	title string,
+	content string,
+	keywords string,
+	image string,
+	video string,
+	categoryIDs []string,
+	tagIDs []string,
+	parentID *uuid.UUID,
+	isActive bool,
+	isFront bool,
+) (*models.Post, error) {
+	slug := s.generateUniqueSlug(slugifyPost(title), "")
+	if slug == "" {
+		return nil, errors.New("slug cannot be empty")
+	}
+
+	post := models.Post{
+		Title:    title,
+		Content:  content,
+		Keywords: keywords,
+		Image:    image,
+		Video:    video,
+		Slug:     slug,
+		ParentID: parentID,
+		IsActive: isActive,
+		IsFront:  isFront,
+	}
+
+	if len(categoryIDs) > 0 {
+		categories, err := s.fetchCategoriesByIDs(categoryIDs)
+		if err != nil {
+			return nil, err
+		}
+		post.Categories = categories
+	}
+
+	if len(tagIDs) > 0 {
+		tags, err := s.fetchTagsByIDs(tagIDs)
+		if err != nil {
+			return nil, err
+		}
+		post.Tags = tags
+	}
+
+	if err := database.DB.Create(&post).Error; err != nil {
+		return nil, err
+	}
+
+	return s.GetPostByID(post.ID.String())
+}
+
+func (s *PostService) GetAllPosts(onlyActive bool, onlyFront bool, page int, limit int) ([]models.Post, int64, error) {
+	var posts []models.Post
+	var total int64
+
+	query := database.DB.Model(&models.Post{})
+	if onlyActive {
+		query = query.Where("is_active = ?", true)
+	}
+	if onlyFront {
+		query = query.Where("is_front = ?", true)
+	}
+
+	if err := query.Count(&total).Error; err != nil {
+		return nil, 0, err
+	}
+
+	offset := (page - 1) * limit
+
+	if err := query.Preload("Categories").Preload("Tags").
+		Order("created_at desc").
+		Limit(limit).
+		Offset(offset).
+		Find(&posts).Error; err != nil {
+		return nil, 0, err
+	}
+
+	return posts, total, nil
+}
+
+func (s *PostService) GetPostByID(id string) (*models.Post, error) {
+	var post models.Post
+	if err := database.DB.Preload("Categories").Preload("Tags").Where("id = ?", id).First(&post).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("post not found")
+		}
+		return nil, err
+	}
+	return &post, nil
+}
+
+func (s *PostService) GetPostBySlug(slug string, onlyActive bool) (*models.Post, error) {
+	var post models.Post
+	query := database.DB.Preload("Categories").Preload("Tags").Where("slug = ?", slug)
+	if onlyActive {
+		query = query.Where("is_active = ?", true)
+	}
+
+	if err := query.First(&post).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("post not found")
+		}
+		return nil, err
+	}
+	return &post, nil
+}
+
+func (s *PostService) UpdatePost(
+	id string,
+	title *string,
+	content *string,
+	keywords *string,
+	image *string,
+	video *string,
+	categoryIDs *[]string,
+	tagIDs *[]string,
+	parentID *uuid.UUID,
+	parentIDSet bool,
+	slug *string,
+	isActive *bool,
+	isFront *bool,
+) (*models.Post, error) {
+	post, err := s.GetPostByID(id)
+	if err != nil {
+		return nil, err
+	}
+
+	updates := map[string]interface{}{}
+	if title != nil {
+		updates["title"] = *title
+	}
+	if content != nil {
+		updates["content"] = *content
+	}
+	if keywords != nil {
+		updates["keywords"] = *keywords
+	}
+	if image != nil {
+		updates["image"] = *image
+	}
+	if video != nil {
+		updates["video"] = *video
+	}
+	if parentIDSet {
+		updates["parent_id"] = parentID
+	}
+	if slug != nil {
+		clean := slugifyPost(*slug)
+		if clean == "" {
+			return nil, errors.New("slug cannot be empty")
+		}
+		if s.slugExists(clean, id) {
+			return nil, errors.New("slug already exists")
+		}
+		updates["slug"] = clean
+	}
+	if isActive != nil {
+		updates["is_active"] = *isActive
+	}
+	if isFront != nil {
+		updates["is_front"] = *isFront
+	}
+
+	if len(updates) > 0 {
+		if err := database.DB.Model(post).Updates(updates).Error; err != nil {
+			return nil, err
+		}
+	}
+
+	if categoryIDs != nil {
+		categories, err := s.fetchCategoriesByIDs(*categoryIDs)
+		if err != nil {
+			return nil, err
+		}
+		if err := database.DB.Model(post).Association("Categories").Replace(categories); err != nil {
+			return nil, err
+		}
+	}
+
+	if tagIDs != nil {
+		tags, err := s.fetchTagsByIDs(*tagIDs)
+		if err != nil {
+			return nil, err
+		}
+		if err := database.DB.Model(post).Association("Tags").Replace(tags); err != nil {
+			return nil, err
+		}
+	}
+
+	return s.GetPostByID(id)
+}
+
+func (s *PostService) DeletePost(id string) error {
+	result := database.DB.Delete(&models.Post{}, "id = ?", id)
+	if result.Error != nil {
+		return result.Error
+	}
+	if result.RowsAffected == 0 {
+		return errors.New("post not found")
+	}
+	return nil
+}
+
+func (s *PostService) fetchCategoriesByIDs(categoryIDs []string) ([]models.PostCategory, error) {
+	var categories []models.PostCategory
+	if err := database.DB.Where("id IN ?", categoryIDs).Find(&categories).Error; err != nil {
+		return nil, err
+	}
+	if len(categories) != len(categoryIDs) {
+		return nil, errors.New("one or more categories not found")
+	}
+	return categories, nil
+}
+
+func (s *PostService) fetchTagsByIDs(tagIDs []string) ([]models.PostTag, error) {
+	var tags []models.PostTag
+	if err := database.DB.Where("id IN ?", tagIDs).Find(&tags).Error; err != nil {
+		return nil, err
+	}
+	if len(tags) != len(tagIDs) {
+		return nil, errors.New("one or more tags not found")
+	}
+	return tags, nil
+}
+
+func (s *PostService) generateUniqueSlug(baseSlug string, excludeID string) string {
+	slug := baseSlug
+	counter := 1
+	for s.slugExists(slug, excludeID) {
+		slug = fmt.Sprintf("%s-%d", baseSlug, counter)
+		counter++
+	}
+	return slug
+}
+
+func (s *PostService) slugExists(slug string, excludeID string) bool {
+	var count int64
+	query := database.DB.Model(&models.Post{}).Where("slug = ?", slug)
+	if excludeID != "" {
+		query = query.Where("id <> ?", excludeID)
+	}
+	query.Count(&count)
+	return count > 0
+}
+
+func slugifyPost(input string) string {
+	clean := strings.TrimSpace(input)
+	if clean == "" {
+		return ""
+	}
+
+	replacer := strings.NewReplacer(
+		"ı", "i",
+		"İ", "i",
+		"ş", "s",
+		"Ş", "s",
+		"ğ", "g",
+		"Ğ", "g",
+		"ç", "c",
+		"Ç", "c",
+		"ö", "o",
+		"Ö", "o",
+		"ü", "u",
+		"Ü", "u",
+	)
+
+	clean = strings.ToLower(replacer.Replace(clean))
+	re := regexp.MustCompile(`[^a-z0-9]+`)
+	clean = re.ReplaceAllString(clean, "-")
+	clean = strings.Trim(clean, "-")
+	if clean == "" {
+		return "post"
+	}
+	return clean
+}

internal/services/post_tag_service.go

@@ -0,0 +1,87 @@
+package services
+
+
+import (
+	"errors"
+
+	"gauth-central/internal/database"
+	"gauth-central/internal/models"
+
+	"gorm.io/gorm"
+)
+
+type PostTagService struct{}
+
+func NewPostTagService() *PostTagService {
+	return &PostTagService{}
+}
+
+func (s *PostTagService) CreatePostTag(tagName string, isActive bool) (*models.PostTag, error) {
+	tag := models.PostTag{
+		Tag:      tagName,
+		IsActive: isActive,
+	}
+
+	if err := database.DB.Create(&tag).Error; err != nil {
+		return nil, err
+	}
+
+	return &tag, nil
+}
+
+func (s *PostTagService) GetAllPostTags(onlyActive bool) ([]models.PostTag, error) {
+	var tags []models.PostTag
+	query := database.DB.Order("created_at desc")
+	if onlyActive {
+		query = query.Where("is_active = ?", true)
+	}
+
+	if err := query.Find(&tags).Error; err != nil {
+		return nil, err
+	}
+
+	return tags, nil
+}
+
+func (s *PostTagService) GetPostTagByID(id string) (*models.PostTag, error) {
+	var tag models.PostTag
+	if err := database.DB.Where("id = ?", id).First(&tag).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("post tag not found")
+		}
+		return nil, err
+	}
+	return &tag, nil
+}
+
+func (s *PostTagService) UpdatePostTag(id string, tagName string, isActive *bool) (*models.PostTag, error) {
+	tag, err := s.GetPostTagByID(id)
+	if err != nil {
+		return nil, err
+	}
+
+	updates := map[string]interface{}{}
+	if tagName != "" {
+		updates["tag"] = tagName
+	}
+	if isActive != nil {
+		updates["is_active"] = *isActive
+	}
+
+	if err := database.DB.Model(tag).Updates(updates).Error; err != nil {
+		return nil, err
+	}
+
+	return tag, nil
+}
+
+func (s *PostTagService) DeletePostTag(id string) error {
+	result := database.DB.Delete(&models.PostTag{}, "id = ?", id)
+	if result.Error != nil {
+		return result.Error
+	}
+	if result.RowsAffected == 0 {
+		return errors.New("post tag not found")
+	}
+	return nil
+}

internal/services/resume_service.go

@@ -0,0 +1,184 @@
+package services
+
+import (
+	"errors"
+
+	"gauth-central/internal/database"
+	"gauth-central/internal/models"
+
+	"gorm.io/gorm"
+)
+
+type ResumeService struct{}
+
+func NewResumeService() *ResumeService {
+	return &ResumeService{}
+}
+
+// CreateResume creates a new resume configuration.
+func (s *ResumeService) CreateResume(title, titleSub, education, experience, codingSkills, knowledge string, isActive bool) (*models.Resume, error) {
+	item := models.Resume{
+		Title:        title,
+		TitleSub:     titleSub,
+		Education:    education,
+		Experience:   experience,
+		CodingSkills: codingSkills,
+		Knowledge:    knowledge,
+		IsActive:     isActive,
+	}
+
+	err := database.DB.Transaction(func(tx *gorm.DB) error {
+		if isActive {
+			// Deactivate all other resumes
+			if err := tx.Model(&models.Resume{}).Where("is_active = ?", true).Update("is_active", false).Error; err != nil {
+				return err
+			}
+		}
+		if err := tx.Create(&item).Error; err != nil {
+			return err
+		}
+		return nil
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	return s.GetResumeByID(item.ID.String())
+}
+
+// GetAllResumes retrieves all resumes. Use onlyActive to filter public data.
+// For admin (onlyActive=false), it returns basic info.
+// For public (onlyActive=true), it preloads all related data (Educations, Experiences, etc.)
+func (s *ResumeService) GetAllResumes(onlyActive bool) ([]models.Resume, error) {
+	var items []models.Resume
+	query := database.DB.Order("created_at desc")
+
+	if onlyActive {
+		query = query.Where("is_active = ?", true).
+			Preload("Educations", func(db *gorm.DB) *gorm.DB {
+				return db.Where("is_active = ?", true).Order("created_at desc")
+			}).
+			Preload("Experiences", func(db *gorm.DB) *gorm.DB {
+				return db.Where("is_active = ?", true).Order("created_at desc")
+			}).
+			Preload("Skills", func(db *gorm.DB) *gorm.DB {
+				return db.Where("is_active = ?", true).Order("degree desc")
+			}).
+			Preload("Knowledges", func(db *gorm.DB) *gorm.DB {
+				return db.Where("is_active = ?", true).Order("created_at desc")
+			})
+	}
+
+	if err := query.Find(&items).Error; err != nil {
+		return nil, err
+	}
+
+	return items, nil
+}
+
+// GetFirstActiveResume returns the single active resume with all relations preloaded.
+func (s *ResumeService) GetFirstActiveResume() (*models.Resume, error) {
+	var item models.Resume
+	query := database.DB.Where("is_active = ?", true).Order("created_at desc").
+		Preload("Educations", func(db *gorm.DB) *gorm.DB {
+			return db.Where("is_active = ?", true).Order("created_at desc")
+		}).
+		Preload("Experiences", func(db *gorm.DB) *gorm.DB {
+			return db.Where("is_active = ?", true).Order("created_at desc")
+		}).
+		Preload("Skills", func(db *gorm.DB) *gorm.DB {
+			return db.Where("is_active = ?", true).Order("degree desc")
+		}).
+		Preload("Knowledges", func(db *gorm.DB) *gorm.DB {
+			return db.Where("is_active = ?", true).Order("created_at desc")
+		})
+
+	if err := query.First(&item).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("resume not found")
+		}
+		return nil, err
+	}
+	return &item, nil
+}
+
+// GetResumeByID retrieves a resume by ID.
+func (s *ResumeService) GetResumeByID(id string) (*models.Resume, error) {
+	var item models.Resume
+	if err := database.DB.Where("id = ?", id).
+		Preload("Educations").
+		Preload("Experiences").
+		Preload("Skills").
+		Preload("Knowledges").
+		First(&item).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("resume not found")
+		}
+		return nil, err
+	}
+	return &item, nil
+}
+
+// UpdateResume updates an existing resume entry.
+func (s *ResumeService) UpdateResume(id string, title, titleSub, education, experience, codingSkills, knowledge *string, isActive *bool) (*models.Resume, error) {
+	item, err := s.GetResumeByID(id)
+	if err != nil {
+		return nil, err
+	}
+
+	updates := map[string]interface{}{}
+	if title != nil {
+		updates["title"] = *title
+	}
+	if titleSub != nil {
+		updates["title_sub"] = *titleSub
+	}
+	if education != nil {
+		updates["education"] = *education
+	}
+	if experience != nil {
+		updates["experience"] = *experience
+	}
+	if codingSkills != nil {
+		updates["coding_skills"] = *codingSkills
+	}
+	if knowledge != nil {
+		updates["knowledge"] = *knowledge
+	}
+	if isActive != nil {
+		updates["is_active"] = *isActive
+	}
+
+	if len(updates) > 0 {
+		err := database.DB.Transaction(func(tx *gorm.DB) error {
+			if isActive != nil && *isActive {
+				// Deactivate all other resumes except the current one
+				if err := tx.Model(&models.Resume{}).Where("id != ? AND is_active = ?", id, true).Update("is_active", false).Error; err != nil {
+					return err
+				}
+			}
+			if err := tx.Model(item).Updates(updates).Error; err != nil {
+				return err
+			}
+			return nil
+		})
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return s.GetResumeByID(id)
+}
+
+// DeleteResume deletes a resume by ID.
+func (s *ResumeService) DeleteResume(id string) error {
+	result := database.DB.Delete(&models.Resume{}, "id = ?", id)
+	if result.Error != nil {
+		return result.Error
+	}
+	if result.RowsAffected == 0 {
+		return errors.New("resume not found")
+	}
+	return nil
+}

internal/services/service_service.go

@@ -0,0 +1,193 @@
+package services
+
+import (
+	"errors"
+	"fmt"
+	"regexp"
+	"strings"
+
+	"gauth-central/internal/database"
+	"gauth-central/internal/models"
+
+	"gorm.io/gorm"
+)
+
+type ServiceService struct{}
+
+func NewServiceService() *ServiceService {
+	return &ServiceService{}
+}
+
+// CreateService creates a new service entry.
+func (s *ServiceService) CreateService(title string, content string, image string, isActive bool) (*models.Service, error) {
+	slug := s.generateUniqueSlug(slugifyService(title), "")
+
+	service := models.Service{
+		Title:    title,
+		Content:  content,
+		Image:    image,
+		Slug:     slug,
+		IsActive: isActive,
+	}
+
+	if err := database.DB.Create(&service).Error; err != nil {
+		return nil, err
+	}
+
+	return s.GetServiceByID(service.ID.String())
+}
+
+// GetAllServices retrieves all services. Use onlyActive to filter public data.
+func (s *ServiceService) GetAllServices(onlyActive bool) ([]models.Service, error) {
+	var services []models.Service
+	query := database.DB.Order("created_at desc")
+	if onlyActive {
+		query = query.Where("is_active = ?", true)
+	}
+
+	if err := query.Find(&services).Error; err != nil {
+		return nil, err
+	}
+
+	return services, nil
+}
+
+// GetServiceByID retrieves a service by ID.
+func (s *ServiceService) GetServiceByID(id string) (*models.Service, error) {
+	var service models.Service
+	if err := database.DB.Where("id = ?", id).First(&service).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("service not found")
+		}
+		return nil, err
+	}
+	return &service, nil
+}
+
+// GetServiceBySlug retrieves a service by slug. Use onlyActive to limit public access.
+func (s *ServiceService) GetServiceBySlug(slug string, onlyActive bool) (*models.Service, error) {
+	var service models.Service
+	query := database.DB.Where("slug = ?", slug)
+	if onlyActive {
+		query = query.Where("is_active = ?", true)
+	}
+
+	if err := query.First(&service).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("service not found")
+		}
+		return nil, err
+	}
+
+	return &service, nil
+}
+
+// UpdateService updates an existing service entry.
+func (s *ServiceService) UpdateService(
+	id string,
+	title *string,
+	content *string,
+	image *string,
+	slug *string,
+	isActive *bool,
+) (*models.Service, error) {
+	service, err := s.GetServiceByID(id)
+	if err != nil {
+		return nil, err
+	}
+
+	updates := map[string]interface{}{}
+	if title != nil {
+		updates["title"] = *title
+	}
+	if content != nil {
+		updates["content"] = *content
+	}
+	if image != nil {
+		updates["image"] = *image
+	}
+	if slug != nil {
+		clean := slugifyService(*slug)
+		if clean == "" {
+			return nil, errors.New("slug cannot be empty")
+		}
+		if s.slugExists(clean, id) {
+			return nil, errors.New("slug already exists")
+		}
+		updates["slug"] = clean
+	}
+	if isActive != nil {
+		updates["is_active"] = *isActive
+	}
+
+	if len(updates) > 0 {
+		if err := database.DB.Model(service).Updates(updates).Error; err != nil {
+			return nil, err
+		}
+	}
+
+	return s.GetServiceByID(id)
+}
+
+// DeleteService deletes a service by ID.
+func (s *ServiceService) DeleteService(id string) error {
+	result := database.DB.Delete(&models.Service{}, "id = ?", id)
+	if result.Error != nil {
+		return result.Error
+	}
+	if result.RowsAffected == 0 {
+		return errors.New("service not found")
+	}
+	return nil
+}
+
+func (s *ServiceService) generateUniqueSlug(baseSlug string, excludeID string) string {
+	slug := baseSlug
+	counter := 1
+	for s.slugExists(slug, excludeID) {
+		slug = fmt.Sprintf("%s-%d", baseSlug, counter)
+		counter++
+	}
+	return slug
+}
+
+func (s *ServiceService) slugExists(slug string, excludeID string) bool {
+	var count int64
+	query := database.DB.Model(&models.Service{}).Where("slug = ?", slug)
+	if excludeID != "" {
+		query = query.Where("id <> ?", excludeID)
+	}
+	query.Count(&count)
+	return count > 0
+}
+
+func slugifyService(input string) string {
+	clean := strings.TrimSpace(input)
+	if clean == "" {
+		return ""
+	}
+
+	replacer := strings.NewReplacer(
+		"ı", "i",
+		"İ", "i",
+		"ş", "s",
+		"Ş", "s",
+		"ğ", "g",
+		"Ğ", "g",
+		"ç", "c",
+		"Ç", "c",
+		"ö", "o",
+		"Ö", "o",
+		"ü", "u",
+		"Ü", "u",
+	)
+
+	clean = strings.ToLower(replacer.Replace(clean))
+	re := regexp.MustCompile(`[^a-z0-9]+`)
+	clean = re.ReplaceAllString(clean, "-")
+	clean = strings.Trim(clean, "-")
+	if clean == "" {
+		return "service"
+	}
+	return clean
+}

internal/services/service_title_service.go

@@ -0,0 +1,134 @@
+package services
+
+import (
+	"errors"
+
+	"gauth-central/internal/database"
+	"gauth-central/internal/models"
+
+	"gorm.io/gorm"
+)
+
+type ServiceTitleService struct{}
+
+func NewServiceTitleService() *ServiceTitleService {
+	return &ServiceTitleService{}
+}
+
+// CreateServiceTitle creates a new service title entry.
+func (s *ServiceTitleService) CreateServiceTitle(title string, titleSub string, isActive bool) (*models.ServiceTitle, error) {
+	item := models.ServiceTitle{
+		Title:    title,
+		TitleSub: titleSub,
+		IsActive: isActive,
+	}
+
+	err := database.DB.Transaction(func(tx *gorm.DB) error {
+		if isActive {
+			// Deactivate all other service titles
+			if err := tx.Model(&models.ServiceTitle{}).Where("is_active = ?", true).Update("is_active", false).Error; err != nil {
+				return err
+			}
+		}
+		if err := tx.Create(&item).Error; err != nil {
+			return err
+		}
+		return nil
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	return s.GetServiceTitleByID(item.ID.String())
+}
+
+// GetAllServiceTitles retrieves all service titles. Use onlyActive to filter public data.
+func (s *ServiceTitleService) GetAllServiceTitles(onlyActive bool) ([]models.ServiceTitle, error) {
+	var items []models.ServiceTitle
+	query := database.DB.Order("created_at desc")
+	if onlyActive {
+		query = query.Where("is_active = ?", true)
+	}
+
+	if err := query.Find(&items).Error; err != nil {
+		return nil, err
+	}
+
+	return items, nil
+}
+
+// GetFirstActiveServiceTitle returns the newest active service title entry.
+func (s *ServiceTitleService) GetFirstActiveServiceTitle() (*models.ServiceTitle, error) {
+	var item models.ServiceTitle
+	if err := database.DB.Where("is_active = ?", true).Order("created_at desc").First(&item).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("service title not found")
+		}
+		return nil, err
+	}
+	return &item, nil
+}
+
+// GetServiceTitleByID retrieves a service title by ID.
+func (s *ServiceTitleService) GetServiceTitleByID(id string) (*models.ServiceTitle, error) {
+	var item models.ServiceTitle
+	if err := database.DB.Where("id = ?", id).First(&item).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("service title not found")
+		}
+		return nil, err
+	}
+	return &item, nil
+}
+
+// UpdateServiceTitle updates an existing service title entry.
+func (s *ServiceTitleService) UpdateServiceTitle(id string, title *string, titleSub *string, isActive *bool) (*models.ServiceTitle, error) {
+	item, err := s.GetServiceTitleByID(id)
+	if err != nil {
+		return nil, err
+	}
+
+	updates := map[string]interface{}{}
+	if title != nil {
+		updates["title"] = *title
+	}
+	if titleSub != nil {
+		updates["title_sub"] = *titleSub
+	}
+	if isActive != nil {
+		updates["is_active"] = *isActive
+	}
+
+	if len(updates) > 0 {
+		err := database.DB.Transaction(func(tx *gorm.DB) error {
+			if isActive != nil && *isActive {
+				// Deactivate all other service titles except the current one
+				if err := tx.Model(&models.ServiceTitle{}).Where("id != ? AND is_active = ?", id, true).Update("is_active", false).Error; err != nil {
+					return err
+				}
+			}
+			if err := tx.Model(item).Updates(updates).Error; err != nil {
+				return err
+			}
+			return nil
+		})
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return s.GetServiceTitleByID(id)
+}
+
+// DeleteServiceTitle deletes a service title by ID.
+func (s *ServiceTitleService) DeleteServiceTitle(id string) error {
+	result := database.DB.Delete(&models.ServiceTitle{}, "id = ?", id)
+	if result.Error != nil {
+		return result.Error
+	}
+	if result.RowsAffected == 0 {
+		return errors.New("service title not found")
+	}
+	return nil
+}

internal/services/settings_service.go

@@ -0,0 +1,353 @@
+package services
+
+import (
+	"errors"
+	"gauth-central/internal/database"
+	"gauth-central/internal/models"
+	"log"
+	"net/url"
+	"strings"
+	"time"
+
+	"gorm.io/gorm"
+)
+
+type SettingsService struct {
+	cacheService *CacheService
+}
+
+func NewSettingsService() *SettingsService {
+	return &SettingsService{
+		cacheService: NewCacheService(),
+	}
+}
+
+// ==================== CORS WHITELIST ====================
+
+func (s *SettingsService) GetAllCorsWhitelist() ([]models.CorsWhitelist, error) {
+	var whitelists []models.CorsWhitelist
+	err := database.DB.Where("is_active = ?", true).Order("created_at DESC").Find(&whitelists).Error
+	return whitelists, err
+}
+
+func (s *SettingsService) GetActiveWhitelistOrigins() ([]string, error) {
+	// Try cache first
+	cached, err := s.cacheService.GetCorsWhitelist()
+	if err == nil && cached != nil {
+		return cached, nil
+	}
+
+	origins, err := s.getActiveWhitelistOriginsFromDB()
+	if err != nil {
+		return nil, err
+	}
+
+	// Cache for 1 hour
+	s.cacheService.SetCorsWhitelist(origins, 1*time.Hour)
+
+	return origins, nil
+}
+
+var ErrCorsOriginExists = errors.New("cors origin already exists")
+
+func (s *SettingsService) CreateCorsWhitelist(whitelist *models.CorsWhitelist) error {
+	var existing models.CorsWhitelist
+	err := database.DB.Where("LOWER(origin) = LOWER(?)", whitelist.Origin).First(&existing).Error
+	if err == nil {
+		if existing.IsActive {
+			return ErrCorsOriginExists
+		}
+
+		updates := map[string]interface{}{
+			"is_active":   true,
+			"description": whitelist.Description,
+			"created_by":  whitelist.CreatedBy,
+		}
+		err = database.DB.Model(&models.CorsWhitelist{}).Where("id = ?", existing.ID).Updates(updates).Error
+		if err != nil {
+			return err
+		}
+		s.InvalidateCorsCache()
+		return nil
+	}
+
+	if !errors.Is(err, gorm.ErrRecordNotFound) {
+		return err
+	}
+
+	err = database.DB.Create(whitelist).Error
+	if err != nil {
+		return err
+	}
+
+	// Invalidate cache
+	s.InvalidateCorsCache()
+	return nil
+}
+
+func (s *SettingsService) UpdateCorsWhitelist(id string, updates map[string]interface{}) error {
+	err := database.DB.Model(&models.CorsWhitelist{}).Where("id = ?", id).Updates(updates).Error
+	if err != nil {
+		return err
+	}
+
+	// Invalidate cache
+	s.InvalidateCorsCache()
+	return nil
+}
+
+func (s *SettingsService) DeleteCorsWhitelist(id string) error {
+	err := database.DB.Delete(&models.CorsWhitelist{}, "id = ?", id).Error
+	if err != nil {
+		return err
+	}
+
+	// Invalidate cache
+	s.InvalidateCorsCache()
+	return nil
+}
+
+// ==================== CORS BLACKLIST ====================
+
+func (s *SettingsService) GetAllCorsBlacklist() ([]models.CorsBlacklist, error) {
+	var blacklists []models.CorsBlacklist
+	err := database.DB.Where("is_active = ?", true).Order("created_at DESC").Find(&blacklists).Error
+	return blacklists, err
+}
+
+func (s *SettingsService) GetActiveBlacklistOrigins() ([]string, error) {
+	// Try cache first
+	cached, err := s.cacheService.GetCorsBlacklist()
+	if err == nil && cached != nil {
+		return cached, nil
+	}
+
+	origins, err := s.getActiveBlacklistOriginsFromDB()
+	if err != nil {
+		return nil, err
+	}
+
+	// Cache for 1 hour
+	s.cacheService.SetCorsBlacklist(origins, 1*time.Hour)
+
+	return origins, nil
+}
+
+func (s *SettingsService) CreateCorsBlacklist(blacklist *models.CorsBlacklist) error {
+	err := database.DB.Create(blacklist).Error
+	if err != nil {
+		return err
+	}
+
+	// Invalidate cache
+	s.InvalidateCorsCache()
+	return nil
+}
+
+func (s *SettingsService) UpdateCorsBlacklist(id string, updates map[string]interface{}) error {
+	err := database.DB.Model(&models.CorsBlacklist{}).Where("id = ?", id).Updates(updates).Error
+	if err != nil {
+		return err
+	}
+
+	// Invalidate cache
+	s.InvalidateCorsCache()
+	return nil
+}
+
+func (s *SettingsService) DeleteCorsBlacklist(id string) error {
+	err := database.DB.Delete(&models.CorsBlacklist{}, "id = ?", id).Error
+	if err != nil {
+		return err
+	}
+
+	// Invalidate cache
+	s.InvalidateCorsCache()
+	return nil
+}
+
+// ==================== RATE LIMIT SETTINGS ====================
+
+func (s *SettingsService) GetAllRateLimitSettings() ([]models.RateLimitSetting, error) {
+	var settings []models.RateLimitSetting
+	err := database.DB.Order("name ASC").Find(&settings).Error
+	return settings, err
+}
+
+func (s *SettingsService) GetRateLimitSettingsMap() (map[string]*models.RateLimitSetting, error) {
+	// Try cache first
+	cached, err := s.cacheService.GetRateLimitSettings()
+	if err == nil && cached != nil {
+		return cached, nil
+	}
+
+	// Fetch from database
+	var settings []models.RateLimitSetting
+	err = database.DB.Where("is_active = ?", true).Find(&settings).Error
+	if err != nil {
+		return nil, err
+	}
+
+	settingsMap := make(map[string]*models.RateLimitSetting)
+	for i := range settings {
+		settingsMap[settings[i].Name] = &settings[i]
+	}
+
+	// Cache for 1 hour
+	s.cacheService.SetRateLimitSettings(settingsMap, 1*time.Hour)
+
+	return settingsMap, nil
+}
+
+func (s *SettingsService) GetRateLimitSettingByName(name string) (*models.RateLimitSetting, error) {
+	settingsMap, err := s.GetRateLimitSettingsMap()
+	if err != nil {
+		return nil, err
+	}
+
+	setting, exists := settingsMap[name]
+	if !exists {
+		return nil, nil
+	}
+
+	return setting, nil
+}
+
+func (s *SettingsService) UpdateRateLimitSetting(id string, updates map[string]interface{}) error {
+	err := database.DB.Model(&models.RateLimitSetting{}).Where("id = ?", id).Updates(updates).Error
+	if err != nil {
+		return err
+	}
+
+	// Invalidate cache
+	s.cacheService.InvalidateRateLimitSettings()
+	return nil
+}
+
+// Invalidate CORS caches (whitelist + blacklist)
+func (s *SettingsService) InvalidateCorsCache() {
+	s.cacheService.InvalidateCorsWhitelist()
+	s.cacheService.InvalidateCorsBlacklist()
+	log.Println("cors_cache_invalidated")
+}
+
+// Check if origin is allowed
+func (s *SettingsService) IsOriginAllowed(origin string) (bool, error) {
+	allowed, _, _, err := s.CheckOrigin(origin)
+	return allowed, err
+}
+
+// CheckOrigin returns decision details for debug logging.
+func (s *SettingsService) CheckOrigin(origin string) (bool, string, string, error) {
+	// Check blacklist first
+	blacklist, err := s.GetActiveBlacklistOrigins()
+	if err != nil {
+		return false, "", "", err
+	}
+
+	for _, blocked := range blacklist {
+		if originMatchesEntry(origin, blocked) {
+			return false, blocked, "blacklist", nil
+		}
+	}
+
+	// Fallback: refresh blacklist on miss (stale cache protection)
+	freshBlacklist, err := s.getActiveBlacklistOriginsFromDB()
+	if err != nil {
+		return false, "", "", err
+	}
+	if len(freshBlacklist) != 0 {
+		s.cacheService.SetCorsBlacklist(freshBlacklist, 1*time.Hour)
+	}
+	for _, blocked := range freshBlacklist {
+		if originMatchesEntry(origin, blocked) {
+			return false, blocked, "blacklist", nil
+		}
+	}
+
+	// Check whitelist
+	whitelist, err := s.GetActiveWhitelistOrigins()
+	if err != nil {
+		return false, "", "", err
+	}
+
+	for _, allowed := range whitelist {
+		if allowed == "*" || originMatchesEntry(origin, allowed) {
+			return true, allowed, "whitelist", nil
+		}
+	}
+
+	// Fallback: refresh whitelist on miss (stale cache protection)
+	freshWhitelist, err := s.getActiveWhitelistOriginsFromDB()
+	if err != nil {
+		return false, "", "", err
+	}
+	if len(freshWhitelist) != 0 {
+		s.cacheService.SetCorsWhitelist(freshWhitelist, 1*time.Hour)
+	}
+	for _, allowed := range freshWhitelist {
+		if allowed == "*" || originMatchesEntry(origin, allowed) {
+			return true, allowed, "whitelist", nil
+		}
+	}
+
+	return false, "", "whitelist", nil
+}
+
+func (s *SettingsService) getActiveWhitelistOriginsFromDB() ([]string, error) {
+	var whitelists []models.CorsWhitelist
+	err := database.DB.Where("is_active = ?", true).Find(&whitelists).Error
+	if err != nil {
+		return nil, err
+	}
+
+	origins := make([]string, len(whitelists))
+	for i, w := range whitelists {
+		origins[i] = w.Origin
+	}
+
+	return origins, nil
+}
+
+func (s *SettingsService) getActiveBlacklistOriginsFromDB() ([]string, error) {
+	var blacklists []models.CorsBlacklist
+	err := database.DB.Where("is_active = ?", true).Find(&blacklists).Error
+	if err != nil {
+		return nil, err
+	}
+
+	origins := make([]string, len(blacklists))
+	for i, b := range blacklists {
+		origins[i] = b.Origin
+	}
+
+	return origins, nil
+}
+
+func originMatchesEntry(origin string, entry string) bool {
+	origin = strings.TrimSpace(origin)
+	entry = strings.TrimSpace(entry)
+	if origin == "" || entry == "" {
+		return false
+	}
+
+	originLower := strings.ToLower(origin)
+	entryLower := strings.ToLower(entry)
+	if strings.Contains(entryLower, "://") {
+		return originLower == entryLower
+	}
+
+	parsed, err := url.Parse(originLower)
+	if err != nil || parsed.Host == "" {
+		return false
+	}
+
+	hostLower := strings.ToLower(parsed.Host)
+	if entryLower == hostLower {
+		return true
+	}
+
+	// Allow entries like "127.0.0.1" to match any port
+	hostOnly := strings.Split(hostLower, ":")[0]
+	return entryLower == hostOnly
+}

internal/services/site_info_service.go

@@ -0,0 +1,245 @@
+package services
+
+import (
+	"errors"
+	"strings"
+
+	"gauth-central/internal/database"
+	"gauth-central/internal/models"
+
+	"gorm.io/gorm"
+)
+
+const (
+	defaultMetaTitle       = "Meta Title"
+	defaultMetaDescription = "Meta Description"
+	defaultSiteURL         = "https://beyhanogur.com.tr"
+	defaultFacebook        = "https://www.facebook.com"
+	defaultX               = "https://www.twitter.com"
+	defaultInstagram       = "https://www.instagram.com"
+	defaultWhatsapp        = "https://www.whatsapp.com"
+	defaultPinterest       = "https://www.pinterest.com"
+	defaultLinkedin        = "https://www.linkedin.com"
+	defaultSlogan          = "Dondurma"
+)
+
+type SiteInfoService struct{}
+
+func NewSiteInfoService() *SiteInfoService {
+	return &SiteInfoService{}
+}
+
+// CreateSiteInfo creates a new site info entry.
+func (s *SiteInfoService) CreateSiteInfo(
+	title string,
+	metaTitle string,
+	metaDescription string,
+	phone string,
+	url string,
+	email string,
+	facebook string,
+	x string,
+	instagram string,
+	whatsapp string,
+	pinterest string,
+	linkedin string,
+	slogan string,
+	wLogo string,
+	bLogo string,
+	isActive bool,
+	address string,
+	copyright string,
+	mapEmbed string,
+) (*models.Setting, error) {
+	metaTitle = applyDefault(metaTitle, defaultMetaTitle)
+	metaDescription = applyDefault(metaDescription, defaultMetaDescription)
+	url = applyDefault(url, defaultSiteURL)
+	facebook = applyDefault(facebook, defaultFacebook)
+	x = applyDefault(x, defaultX)
+	instagram = applyDefault(instagram, defaultInstagram)
+	whatsapp = applyDefault(whatsapp, defaultWhatsapp)
+	pinterest = applyDefault(pinterest, defaultPinterest)
+	linkedin = applyDefault(linkedin, defaultLinkedin)
+	slogan = applyDefault(slogan, defaultSlogan)
+
+	setting := models.Setting{
+		Title:           title,
+		MetaTitle:       metaTitle,
+		MetaDescription: metaDescription,
+		Phone:           phone,
+		URL:             url,
+		Email:           email,
+		Facebook:        facebook,
+		X:               x,
+		Instagram:       instagram,
+		Whatsapp:        whatsapp,
+		Pinterest:       pinterest,
+		Linkedin:        linkedin,
+		Slogan:          slogan,
+		WLogo:           wLogo,
+		BLogo:           bLogo,
+		IsActive:        isActive,
+		Address:         address,
+		Copyright:       copyright,
+		MapEmbed:        mapEmbed,
+	}
+
+	if err := database.DB.Create(&setting).Error; err != nil {
+		return nil, err
+	}
+
+	return s.GetSiteInfoByID(setting.ID.String())
+}
+
+// GetAllSiteInfos retrieves all site info entries. Use onlyActive to filter public data.
+func (s *SiteInfoService) GetAllSiteInfos(onlyActive bool) ([]models.Setting, error) {
+	var settings []models.Setting
+	query := database.DB.Order("created_at desc")
+	if onlyActive {
+		query = query.Where("is_active = ?", true)
+	}
+	if err := query.Find(&settings).Error; err != nil {
+		return nil, err
+	}
+	return settings, nil
+}
+
+// GetFirstActiveSiteInfo returns the newest active site info entry.
+func (s *SiteInfoService) GetFirstActiveSiteInfo() (*models.Setting, error) {
+	var setting models.Setting
+	if err := database.DB.Where("is_active = ?", true).Order("created_at desc").First(&setting).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("site info not found")
+		}
+		return nil, err
+	}
+	return &setting, nil
+}
+
+// GetSiteInfoByID retrieves a site info entry by ID.
+func (s *SiteInfoService) GetSiteInfoByID(id string) (*models.Setting, error) {
+	var setting models.Setting
+	if err := database.DB.Where("id = ?", id).First(&setting).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("site info not found")
+		}
+		return nil, err
+	}
+	return &setting, nil
+}
+
+// UpdateSiteInfo updates an existing site info entry.
+func (s *SiteInfoService) UpdateSiteInfo(
+	id string,
+	title *string,
+	metaTitle *string,
+	metaDescription *string,
+	phone *string,
+	url *string,
+	email *string,
+	facebook *string,
+	x *string,
+	instagram *string,
+	whatsapp *string,
+	pinterest *string,
+	linkedin *string,
+	slogan *string,
+	wLogo *string,
+	bLogo *string,
+	isActive *bool,
+	address *string,
+	copyright *string,
+	mapEmbed *string,
+) (*models.Setting, error) {
+	setting, err := s.GetSiteInfoByID(id)
+	if err != nil {
+		return nil, err
+	}
+
+	updates := map[string]interface{}{}
+	if title != nil {
+		updates["title"] = *title
+	}
+	if metaTitle != nil {
+		updates["meta_title"] = applyDefault(*metaTitle, defaultMetaTitle)
+	}
+	if metaDescription != nil {
+		updates["meta_description"] = applyDefault(*metaDescription, defaultMetaDescription)
+	}
+	if phone != nil {
+		updates["phone"] = *phone
+	}
+	if url != nil {
+		updates["url"] = applyDefault(*url, defaultSiteURL)
+	}
+	if email != nil {
+		updates["email"] = *email
+	}
+	if facebook != nil {
+		updates["facebook"] = applyDefault(*facebook, defaultFacebook)
+	}
+	if x != nil {
+		updates["x"] = applyDefault(*x, defaultX)
+	}
+	if instagram != nil {
+		updates["instagram"] = applyDefault(*instagram, defaultInstagram)
+	}
+	if whatsapp != nil {
+		updates["whatsapp"] = applyDefault(*whatsapp, defaultWhatsapp)
+	}
+	if pinterest != nil {
+		updates["pinterest"] = applyDefault(*pinterest, defaultPinterest)
+	}
+	if linkedin != nil {
+		updates["linkedin"] = applyDefault(*linkedin, defaultLinkedin)
+	}
+	if slogan != nil {
+		updates["slogan"] = applyDefault(*slogan, defaultSlogan)
+	}
+	if wLogo != nil {
+		updates["w_logo"] = *wLogo
+	}
+	if bLogo != nil {
+		updates["b_logo"] = *bLogo
+	}
+	if isActive != nil {
+		updates["is_active"] = *isActive
+	}
+	if address != nil {
+		updates["address"] = *address
+	}
+	if copyright != nil {
+		updates["copyright"] = *copyright
+	}
+	if mapEmbed != nil {
+		updates["map_embed"] = *mapEmbed
+	}
+
+	if len(updates) > 0 {
+		if err := database.DB.Model(setting).Updates(updates).Error; err != nil {
+			return nil, err
+		}
+	}
+
+	return s.GetSiteInfoByID(id)
+}
+
+// DeleteSiteInfo deletes a site info entry by ID.
+func (s *SiteInfoService) DeleteSiteInfo(id string) error {
+	result := database.DB.Delete(&models.Setting{}, "id = ?", id)
+	if result.Error != nil {
+		return result.Error
+	}
+	if result.RowsAffected == 0 {
+		return errors.New("site info not found")
+	}
+	return nil
+}
+
+func applyDefault(value string, fallback string) string {
+	clean := strings.TrimSpace(value)
+	if clean == "" {
+		return fallback
+	}
+	return clean
+}

internal/services/site_settings_service.go

@@ -0,0 +1,109 @@
+package services
+
+import (
+	"errors"
+
+	"gauth-central/internal/database"
+	"gauth-central/internal/models"
+
+	"gorm.io/gorm"
+)
+
+type SiteSettingsService struct{}
+
+func NewSiteSettingsService() *SiteSettingsService {
+	return &SiteSettingsService{}
+}
+
+// CreateSiteSettings creates a new site settings entry.
+func (s *SiteSettingsService) CreateSiteSettings(isActive bool, siteActive bool) (*models.SiteSettings, error) {
+	settings := models.SiteSettings{
+		IsActive:   isActive,
+		SiteActive: siteActive,
+	}
+
+	if err := database.DB.Create(&settings).Error; err != nil {
+		return nil, err
+	}
+
+	return s.GetSiteSettingsByID(settings.ID.String())
+}
+
+// GetAllSiteSettings retrieves all site settings entries. Use onlyActive to filter public data.
+func (s *SiteSettingsService) GetAllSiteSettings(onlyActive bool) ([]models.SiteSettings, error) {
+	var settings []models.SiteSettings
+	query := database.DB.Order("created_at desc")
+	if onlyActive {
+		query = query.Where("is_active = ?", true)
+	}
+
+	if err := query.Find(&settings).Error; err != nil {
+		return nil, err
+	}
+
+	return settings, nil
+}
+
+// GetFirstActiveSiteSettings returns the newest active site settings entry.
+func (s *SiteSettingsService) GetFirstActiveSiteSettings() (*models.SiteSettings, error) {
+	var settings models.SiteSettings
+	if err := database.DB.Where("is_active = ?", true).Order("created_at desc").First(&settings).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("site settings not found")
+		}
+		return nil, err
+	}
+	return &settings, nil
+}
+
+// GetSiteSettingsByID retrieves a site settings entry by ID.
+func (s *SiteSettingsService) GetSiteSettingsByID(id string) (*models.SiteSettings, error) {
+	var settings models.SiteSettings
+	if err := database.DB.Where("id = ?", id).First(&settings).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("site settings not found")
+		}
+		return nil, err
+	}
+	return &settings, nil
+}
+
+// UpdateSiteSettings updates an existing site settings entry.
+func (s *SiteSettingsService) UpdateSiteSettings(
+	id string,
+	isActive *bool,
+	siteActive *bool,
+) (*models.SiteSettings, error) {
+	settings, err := s.GetSiteSettingsByID(id)
+	if err != nil {
+		return nil, err
+	}
+
+	updates := map[string]interface{}{}
+	if isActive != nil {
+		updates["is_active"] = *isActive
+	}
+	if siteActive != nil {
+		updates["site_active"] = *siteActive
+	}
+
+	if len(updates) > 0 {
+		if err := database.DB.Model(settings).Updates(updates).Error; err != nil {
+			return nil, err
+		}
+	}
+
+	return s.GetSiteSettingsByID(id)
+}
+
+// DeleteSiteSettings deletes a site settings entry by ID.
+func (s *SiteSettingsService) DeleteSiteSettings(id string) error {
+	result := database.DB.Delete(&models.SiteSettings{}, "id = ?", id)
+	if result.Error != nil {
+		return result.Error
+	}
+	if result.RowsAffected == 0 {
+		return errors.New("site settings not found")
+	}
+	return nil
+}

internal/services/skill_service.go

@@ -0,0 +1,99 @@
+package services
+
+import (
+	"errors"
+
+	"gauth-central/internal/database"
+	"gauth-central/internal/models"
+
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+type SkillService struct{}
+
+func NewSkillService() *SkillService {
+	return &SkillService{}
+}
+
+func (s *SkillService) GetAllSkills(resumeID *string, onlyActive bool) ([]models.Skill, error) {
+	var items []models.Skill
+	query := database.DB.Order("degree desc")
+
+	if resumeID != nil {
+		query = query.Where("resume_id = ?", *resumeID)
+	}
+
+	if onlyActive {
+		query = query.Where("is_active = ?", true)
+	}
+
+	if err := query.Find(&items).Error; err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
+func (s *SkillService) GetSkillByID(id string) (*models.Skill, error) {
+	var item models.Skill
+	if err := database.DB.Where("id = ?", id).First(&item).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("skill not found")
+		}
+		return nil, err
+	}
+	return &item, nil
+}
+
+func (s *SkillService) CreateSkill(title string, degree int, resumeID *uuid.UUID, isActive bool) (*models.Skill, error) {
+	item := models.Skill{
+		Title:    title,
+		Degree:   degree,
+		ResumeID: resumeID,
+		IsActive: isActive,
+	}
+
+	if err := database.DB.Create(&item).Error; err != nil {
+		return nil, err
+	}
+	return &item, nil
+}
+
+func (s *SkillService) UpdateSkill(id string, title *string, degree *int, resumeID *uuid.UUID, isActive *bool) (*models.Skill, error) {
+	item, err := s.GetSkillByID(id)
+	if err != nil {
+		return nil, err
+	}
+
+	updates := map[string]interface{}{}
+	if title != nil {
+		updates["title"] = *title
+	}
+	if degree != nil {
+		updates["degree"] = *degree
+	}
+	if resumeID != nil {
+		updates["resume_id"] = *resumeID
+	}
+	if isActive != nil {
+		updates["is_active"] = *isActive
+	}
+
+	if len(updates) > 0 {
+		if err := database.DB.Model(item).Updates(updates).Error; err != nil {
+			return nil, err
+		}
+	}
+	return s.GetSkillByID(id)
+}
+
+func (s *SkillService) DeleteSkill(id string) error {
+	result := database.DB.Delete(&models.Skill{}, "id = ?", id)
+	if result.Error != nil {
+		return result.Error
+	}
+	if result.RowsAffected == 0 {
+		return errors.New("skill not found")
+	}
+	return nil
+}

internal/services/tag_service.go

@@ -0,0 +1,91 @@
+package services
+
+import (
+	"errors"
+	"gauth-central/internal/database"
+	"gauth-central/internal/models"
+
+	"gorm.io/gorm"
+)
+
+type TagService struct{}
+
+func NewTagService() *TagService {
+	return &TagService{}
+}
+
+// CreateTag creates a new tag
+func (s *TagService) CreateTag(tagName string, isActive bool) (*models.Tag, error) {
+	tag := models.Tag{
+		Tag:      tagName,
+		IsActive: isActive,
+	}
+
+	if err := database.DB.Create(&tag).Error; err != nil {
+		return nil, err
+	}
+
+	return &tag, nil
+}
+
+// GetAllTags retrieves all tags (optionally filter by active status)
+func (s *TagService) GetAllTags(onlyActive bool) ([]models.Tag, error) {
+	var tags []models.Tag
+	query := database.DB.Order("created_at desc")
+
+	if onlyActive {
+		query = query.Where("is_active = ?", true)
+	}
+
+	if err := query.Find(&tags).Error; err != nil {
+		return nil, err
+	}
+
+	return tags, nil
+}
+
+// GetTagByID retrieves a tag by ID
+func (s *TagService) GetTagByID(id string) (*models.Tag, error) {
+	var tag models.Tag
+	if err := database.DB.Where("id = ?", id).First(&tag).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("tag not found")
+		}
+		return nil, err
+	}
+	return &tag, nil
+}
+
+// UpdateTag updates an existing tag
+func (s *TagService) UpdateTag(id string, tagName string, isActive *bool) (*models.Tag, error) {
+	tag, err := s.GetTagByID(id)
+	if err != nil {
+		return nil, err
+	}
+
+	updates := map[string]interface{}{}
+	if tagName != "" {
+		updates["tag"] = tagName
+	}
+	if isActive != nil {
+		updates["is_active"] = *isActive
+	}
+
+	if err := database.DB.Model(tag).Updates(updates).Error; err != nil {
+		return nil, err
+	}
+
+	return tag, nil
+}
+
+// DeleteTag deletes a tag
+func (s *TagService) DeleteTag(id string) error {
+	result := database.DB.Delete(&models.Tag{}, "id = ?", id)
+	if result.Error != nil {
+		return result.Error
+	}
+	if result.RowsAffected == 0 {
+		return errors.New("tag not found")
+	}
+	return nil
+}

internal/services/user_management_service.go

@@ -0,0 +1,257 @@
+package services
+
+import (
+	"errors"
+
+	"gauth-central/internal/database"
+	"gauth-central/internal/models"
+
+	"golang.org/x/crypto/bcrypt"
+	"gorm.io/gorm"
+)
+
+type UserManagementService struct{}
+
+func NewUserManagementService() *UserManagementService {
+	return &UserManagementService{}
+}
+
+var ErrUserNotFound = errors.New("user not found")
+
+// GetAllUsers - Tüm kullanıcıları getir (admin için)
+func (s *UserManagementService) GetAllUsers(page, limit int) ([]models.User, int64, error) {
+	var users []models.User
+	var total int64
+
+	// Count total users
+	database.DB.Model(&models.User{}).Count(&total)
+
+	// Calculate offset
+	offset := (page - 1) * limit
+
+	// Fetch users with pagination and preload roles
+	err := database.DB.
+		Preload("Roles").
+		Preload("SocialAccounts").
+		Offset(offset).
+		Limit(limit).
+		Order("created_at DESC").
+		Find(&users).Error
+
+	return users, total, err
+}
+
+// GetUserByID - ID'ye göre kullanıcı getir
+func (s *UserManagementService) GetUserByID(userID string) (*models.User, error) {
+	var user models.User
+	err := database.DB.
+		Preload("Roles").
+		Preload("Roles.Permissions").
+		Preload("SocialAccounts").
+		Where("id = ?", userID).
+		First(&user).Error
+
+	if err != nil {
+		return nil, err
+	}
+
+	return &user, nil
+}
+
+// CreateUser - Yeni kullanıcı oluştur (admin tarafından)
+func (s *UserManagementService) CreateUser(email, password, userName string, emailVerified bool, roleNames []string) (*models.User, error) {
+	// Hash password
+	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	if err != nil {
+		return nil, err
+	}
+
+	user := &models.User{
+		Email:         email,
+		UserName:      userName,
+		Password:      string(hashedPassword),
+		EmailVerified: &emailVerified,
+	}
+
+	// Create user
+	if err := database.DB.Create(user).Error; err != nil {
+		return nil, err
+	}
+
+	// Assign roles
+	if len(roleNames) > 0 {
+		var roles []models.Role
+		database.DB.Where("name IN ?", roleNames).Find(&roles)
+		if len(roles) > 0 {
+			database.DB.Model(user).Association("Roles").Append(roles)
+		}
+	} else {
+		// Assign default "user" role
+		var userRole models.Role
+		database.DB.Where("name = ?", "user").First(&userRole)
+		database.DB.Model(user).Association("Roles").Append(&userRole)
+	}
+
+	// Reload user with roles
+	database.DB.Preload("Roles").Where("id = ?", user.ID).First(user)
+
+	return user, nil
+}
+
+// UpdateUser - Kullanıcı bilgilerini güncelle
+func (s *UserManagementService) UpdateUser(userID string, updates map[string]interface{}) error {
+	// Check if user exists
+	var user models.User
+	if err := database.DB.Where("id = ?", userID).First(&user).Error; err != nil {
+		return err
+	}
+
+	// If password is being updated, hash it
+	if password, ok := updates["password"].(string); ok && password != "" {
+		hashedPassword, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+		if err != nil {
+			return err
+		}
+		updates["password"] = string(hashedPassword)
+	}
+
+	// Use Updates with Select to update specific fields including zero values
+	return database.DB.Model(&user).Updates(updates).Error
+}
+
+// DeleteUser - Kullanıcıyı sil (soft delete, hard=true ise kalıcı silme)
+func (s *UserManagementService) DeleteUser(userID string, hardDelete bool) error {
+	if hardDelete {
+		// Hard delete - ilişkili kayıtları da sil
+		var user models.User
+		if err := database.DB.Unscoped().Where("id = ?", userID).First(&user).Error; err != nil {
+			if errors.Is(err, gorm.ErrRecordNotFound) {
+				return ErrUserNotFound
+			}
+			return err
+		}
+
+		// Delete relations first
+		database.DB.Exec("DELETE FROM user_roles WHERE user_id = ?", userID)
+		database.DB.Exec("DELETE FROM social_accounts WHERE user_id = ?", userID)
+
+		// Permanently delete user
+		result := database.DB.Unscoped().Delete(&models.User{}, "id = ?", userID)
+		if result.Error != nil {
+			return result.Error
+		}
+		if result.RowsAffected == 0 {
+			return ErrUserNotFound
+		}
+		return nil
+	}
+
+	// Soft delete
+	result := database.DB.Delete(&models.User{}, "id = ?", userID)
+	if result.Error != nil {
+		return result.Error
+	}
+	if result.RowsAffected == 0 {
+		return ErrUserNotFound
+	}
+	return nil
+}
+
+// AssignRoles - Kullanıcıya roller ata
+func (s *UserManagementService) AssignRoles(userID string, roleNames []string) error {
+	var user models.User
+	if err := database.DB.Where("id = ?", userID).First(&user).Error; err != nil {
+		return err
+	}
+
+	var roles []models.Role
+	if err := database.DB.Where("name IN ?", roleNames).Find(&roles).Error; err != nil {
+		return err
+	}
+
+	if len(roles) == 0 {
+		return errors.New("no valid roles found")
+	}
+
+	return database.DB.Model(&user).Association("Roles").Replace(roles)
+}
+
+// RemoveRole - Kullanıcıdan rol kaldır
+func (s *UserManagementService) RemoveRole(userID string, roleName string) error {
+	var user models.User
+	if err := database.DB.Where("id = ?", userID).First(&user).Error; err != nil {
+		return err
+	}
+
+	var role models.Role
+	if err := database.DB.Where("name = ?", roleName).First(&role).Error; err != nil {
+		return err
+	}
+
+	return database.DB.Model(&user).Association("Roles").Delete(&role)
+}
+
+// SearchUsers - Kullanıcı ara (email, username)
+func (s *UserManagementService) SearchUsers(query string, page, limit int) ([]models.User, int64, error) {
+	var users []models.User
+	var total int64
+
+	searchQuery := "%" + query + "%"
+
+	// Count total matching users
+	database.DB.Model(&models.User{}).
+		Where("email ILIKE ? OR user_name ILIKE ?", searchQuery, searchQuery).
+		Count(&total)
+
+	// Calculate offset
+	offset := (page - 1) * limit
+
+	// Fetch users
+	err := database.DB.
+		Preload("Roles").
+		Preload("SocialAccounts").
+		Where("email ILIKE ? OR user_name ILIKE ?", searchQuery, searchQuery).
+		Offset(offset).
+		Limit(limit).
+		Order("created_at DESC").
+		Find(&users).Error
+
+	return users, total, err
+}
+
+// GetDeletedUsers - Soft delete edilmiş kullanıcıları getir
+func (s *UserManagementService) GetDeletedUsers(page, limit int) ([]models.User, int64, error) {
+	var users []models.User
+	var total int64
+
+	// Count total deleted users
+	database.DB.Model(&models.User{}).Unscoped().Where("deleted_at IS NOT NULL").Count(&total)
+
+	// Calculate offset
+	offset := (page - 1) * limit
+
+	// Fetch deleted users with pagination
+	err := database.DB.Unscoped().
+		Preload("Roles").
+		Preload("SocialAccounts").
+		Where("deleted_at IS NOT NULL").
+		Offset(offset).
+		Limit(limit).
+		Order("deleted_at DESC").
+		Find(&users).Error
+
+	return users, total, err
+}
+
+// RestoreUser - Soft delete edilmiş kullanıcıyı geri yükle
+func (s *UserManagementService) RestoreUser(userID string) error {
+	var user models.User
+
+	// Find soft deleted user
+	if err := database.DB.Unscoped().Where("id = ? AND deleted_at IS NOT NULL", userID).First(&user).Error; err != nil {
+		return errors.New("deleted user not found")
+	}
+
+	// Restore user (set deleted_at to NULL)
+	return database.DB.Unscoped().Model(&user).Update("deleted_at", nil).Error
+}

internal/services/uuid_helpers.go

@@ -0,0 +1,19 @@
+package services
+
+import (
+	"strings"
+
+	"github.com/google/uuid"
+)
+
+func parseUUIDPtr(value string) (*uuid.UUID, error) {
+	value = strings.TrimSpace(value)
+	if value == "" {
+		return nil, nil
+	}
+	parsed, err := uuid.Parse(value)
+	if err != nil {
+		return nil, err
+	}
+	return &parsed, nil
+}