src/main/kotlin/org/octopus/internal/web/utils/dtos/validators/EntryHexColorValidator.kt

@@ -0,0 +1,41 @@
+package org.octopus.internal.web.utils.dtos.validators
+
+import jakarta.validation.Constraint
+import jakarta.validation.ConstraintValidator
+import jakarta.validation.ConstraintValidatorContext
+import jakarta.validation.Payload
+import org.octopus.internal.common.enums.EEntryType
+import kotlin.reflect.KClass
+
+
+class EntryHexColorValidator : ConstraintValidator<EntryHexColorValidator.Validate, String> {
+    companion object {
+        private val HEX_COLOR_PATTERN = Regex("^0x([0-9a-fA-F]{6}|[0-9a-fA-F]{3})$")
+    }
+
+    override fun isValid(value: String?, context: ConstraintValidatorContext): Boolean {
+        if (value.isNullOrBlank()) {
+            return false
+        }
+
+        val isMatched = HEX_COLOR_PATTERN.matches(value)
+
+        if (!isMatched) {
+            context.disableDefaultConstraintViolation()
+            context.buildConstraintViolationWithTemplate("Invalid hex color format. Value must be in 0xRRGGBB format.")
+                .addConstraintViolation()
+        }
+
+        return isMatched
+    }
+
+    @Target(AnnotationTarget.FIELD, AnnotationTarget.PROPERTY, AnnotationTarget.VALUE_PARAMETER)
+    @Retention(AnnotationRetention.RUNTIME)
+    @MustBeDocumented
+    @Constraint(validatedBy = [EntryHexColorValidator::class])
+    annotation class Validate(
+        val message: String = "",
+        val groups: Array<KClass<*>> = [],
+        val payload: Array<KClass<out Payload>> = []
+    )
+}