fix

backend-old/internal/utils/validation.go

@@ -0,0 +1,128 @@
+package utils
+
+import (
+	"regexp"
+	"strings"
+	"unicode"
+)
+
+// IsValidEmail 验证邮箱格式
+func IsValidEmail(email string) bool {
+	emailRegex := regexp.MustCompile(`^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$`)
+	return emailRegex.MatchString(email)
+}
+
+// IsValidUsername 验证用户名格式
+func IsValidUsername(username string) bool {
+	// 用户名长度3-20，只能包含字母、数字、下划线
+	if len(username) < 3 || len(username) > 20 {
+		return false
+	}
+	
+	usernameRegex := regexp.MustCompile(`^[a-zA-Z0-9_]+$`)
+	return usernameRegex.MatchString(username)
+}
+
+// IsValidPassword 验证密码强度
+func IsValidPassword(password string) bool {
+	// 密码长度至少6位
+	if len(password) < 6 {
+		return false
+	}
+	
+	// 检查是否包含字母和数字
+	hasLetter := false
+	hasNumber := false
+	
+	for _, char := range password {
+		if unicode.IsLetter(char) {
+			hasLetter = true
+		}
+		if unicode.IsNumber(char) {
+			hasNumber = true
+		}
+	}
+	
+	return hasLetter && hasNumber
+}
+
+// IsValidSlug 验证slug格式
+func IsValidSlug(slug string) bool {
+	// slug只能包含小写字母、数字和连字符
+	if len(slug) == 0 || len(slug) > 100 {
+		return false
+	}
+	
+	slugRegex := regexp.MustCompile(`^[a-z0-9-]+$`)
+	return slugRegex.MatchString(slug) && !strings.HasPrefix(slug, "-") && !strings.HasSuffix(slug, "-")
+}
+
+// IsValidHexColor 验证十六进制颜色代码
+func IsValidHexColor(color string) bool {
+	colorRegex := regexp.MustCompile(`^#[a-fA-F0-9]{6}$`)
+	return colorRegex.MatchString(color)
+}
+
+// IsValidURL 验证URL格式
+func IsValidURL(url string) bool {
+	urlRegex := regexp.MustCompile(`^https?://[^\s/$.?#].[^\s]*$`)
+	return urlRegex.MatchString(url)
+}
+
+// SanitizeString 清理字符串，移除HTML标签和特殊字符
+func SanitizeString(input string) string {
+	// 移除HTML标签
+	htmlRegex := regexp.MustCompile(`<[^>]*>`)
+	cleaned := htmlRegex.ReplaceAllString(input, "")
+	
+	// 移除多余的空白字符
+	whitespaceRegex := regexp.MustCompile(`\s+`)
+	cleaned = whitespaceRegex.ReplaceAllString(cleaned, " ")
+	
+	return strings.TrimSpace(cleaned)
+}
+
+// ValidateImageFormat 验证图片格式
+func ValidateImageFormat(filename string) bool {
+	allowedExtensions := []string{".jpg", ".jpeg", ".png", ".gif", ".webp"}
+	lowerFilename := strings.ToLower(filename)
+	
+	for _, ext := range allowedExtensions {
+		if strings.HasSuffix(lowerFilename, ext) {
+			return true
+		}
+	}
+	
+	return false
+}
+
+// ValidateFileSize 验证文件大小（字节）
+func ValidateFileSize(size int64, maxSizeMB int64) bool {
+	maxSizeBytes := maxSizeMB * 1024 * 1024
+	return size <= maxSizeBytes && size > 0
+}
+
+// NormalizeString 标准化字符串（去空格、转小写）
+func NormalizeString(s string) string {
+	return strings.ToLower(strings.TrimSpace(s))
+}
+
+// ContainsOnlyASCII 检查字符串是否只包含ASCII字符
+func ContainsOnlyASCII(s string) bool {
+	for _, char := range s {
+		if char > 127 {
+			return false
+		}
+	}
+	return true
+}
+
+// Contains 检查切片是否包含指定元素
+func Contains(slice []string, item string) bool {
+	for _, s := range slice {
+		if s == item {
+			return true
+		}
+	}
+	return false
+}