2 files changed, 44 insertions, 0 deletions
diff --git a/src/main/scala/xyz/driver/common/validation/ValidationError.scala b/src/main/scala/xyz/driver/common/validation/ValidationError.scala
new file mode 100644
index 0000000..6db445d
--- /dev/null
+++ b/src/main/scala/xyz/driver/common/validation/ValidationError.scala
@@ -0,0 +1,3 @@
+package xyz.driver.common.validation
+
+final case class ValidationError(message: String)
diff --git a/src/main/scala/xyz/driver/common/validation/Validators.scala b/src/main/scala/xyz/driver/common/validation/Validators.scala
new file mode 100644
index 0000000..8d807f4
--- /dev/null
+++ b/src/main/scala/xyz/driver/common/validation/Validators.scala
@@ -0,0 +1,41 @@
+package xyz.driver.common.validation
+
+import xyz.driver.common.logging._
+import xyz.driver.common.utils.JsonSerializer
+
+import scala.util.control.NonFatal
+
+object Validators extends PhiLogging {
+
+  type Validator[Input, Refined] = Input => Either[ValidationError, Refined]
+
+  def generic[T, R](message: String)(f: PartialFunction[T, R]): Validator[T, R] = { value =>
+    if (f.isDefinedAt(value)) Right(f(value))
+    else Left(ValidationError(message))
+  }
+
+  def nonEmpty[T](field: String): Validator[Option[T], T] = generic(s"$field is empty") {
+    case Some(x) => x
+  }
+
+  def nonEmptyString(field: String): Validator[String, String] = generic(s"$field is empty") {
+    case x if x.nonEmpty => x
+  }
+
+  def deserializableTo[Refined](field: String)
+                               (value: String)
+                               (implicit m: Manifest[Refined]): Either[ValidationError, Refined] = {
+    try {
+      Right(JsonSerializer.deserialize[Refined](value))
+    } catch {
+      case NonFatal(e) =>
+        logger.error(phi"Can not deserialize the ${Unsafe(field)}: $e")
+        Left(ValidationError(s"$field is invalid"))
+    }
+  }
+
+  def success[T](result: T): Either[Nothing, T] = Right(result)
+
+  def fail(message: String): Either[ValidationError, Nothing] = Left(ValidationError(message))
+
+}