Add utility functions for password hashing and data validation

pkg/utils/conv.go

@@ -0,0 +1,25 @@
+package utils
+
+import (
+	"strconv"
+
+	"golang.org/x/crypto/bcrypt"
+)
+
+func HashPassword(password string) (string, error) {
+	bytes, err := bcrypt.GenerateFromPassword([]byte(password), 14)
+	return string(bytes), err
+}
+
+func CheckPasswordHash(password, hash string) bool {
+	err := bcrypt.CompareHashAndPassword([]byte(hash), []byte(password))
+	return err == nil
+}
+
+func StringToUint(s string) uint {
+	id, err := strconv.ParseUint(s, 10, 64)
+	if err != nil {
+		return 0
+	}
+	return uint(id)
+}

pkg/utils/validator.go

@@ -0,0 +1,49 @@
+package utils
+
+import (
+	"errors"
+
+	"github.com/go-playground/validator/v10"
+)
+
+var validate *validator.Validate
+
+func init() {
+	validate = validator.New()
+}
+
+func Validate(data interface{}) error {
+	var errorMessages []string
+
+	err := validate.Struct(data)
+	if err != nil {
+		for _, err := range err.(validator.ValidationErrors) {
+			switch err.Tag() {
+			case "required":
+				errorMessages = append(errorMessages, err.Field()+" is required")
+			case "email":
+				errorMessages = append(errorMessages, err.Field()+" must be a valid email")
+			case "min":
+				errorMessages = append(errorMessages, err.Field()+" must be at least "+err.Param()+" characters long")
+			case "max":
+				errorMessages = append(errorMessages, err.Field()+" must be at most "+err.Param()+" characters long")
+			default:
+				errorMessages = append(errorMessages, err.Field()+" is not valid")
+			}
+		}
+		return errors.New("validation failed: " + joinMessages(errorMessages))
+	}
+
+	return nil
+}
+
+func joinMessages(messages []string) string {
+	result := ""
+	for i, msg := range messages {
+		if i > 0 {
+			result += ", "
+		}
+		result += msg
+	}
+	return result
+}