Add users validation

api/src/routing/UserController.kt

@@ -4,6 +4,8 @@ import be.vandewalleh.entities.User
 import be.vandewalleh.extensions.respondStatus
 import be.vandewalleh.extensions.userId
 import be.vandewalleh.services.UserService
+import be.vandewalleh.validation.receiveValidated
+import be.vandewalleh.validation.user.registerValidator
 import io.ktor.application.*
 import io.ktor.auth.*
 import io.ktor.http.*
@@ -18,14 +20,9 @@ import java.time.LocalDateTime
 fun Routing.user(kodein: Kodein) {
     val userService by kodein.instance<UserService>()
 
-    post("/user/test") {
-        val user = call.receive<User>()
-        call.respond(user)
-    }
-
     route("/user") {
         post {
-            val user = call.receive<User>()
+            val user = call.receiveValidated(registerValidator)
 
             if (userService.userExists(user.username, user.email))
                 return@post call.respondStatus(HttpStatusCode.Conflict)
@@ -39,7 +36,7 @@ fun Routing.user(kodein: Kodein) {
 
         authenticate {
             put {
-                val user = call.receive<User>()
+                val user = call.receiveValidated(registerValidator)
 
                 if (userService.userExists(user.username, user.email))
                     return@put call.respond(HttpStatusCode.Conflict)

api/src/validation/ValidationExtensions.kt

@@ -0,0 +1,14 @@
+package be.vandewalleh.validation
+
+import am.ik.yavi.core.Validator
+import am.ik.yavi.core.ViolationDetail
+import io.ktor.application.*
+import io.ktor.request.*
+
+suspend inline fun <reified T : Any> ApplicationCall.receiveValidated(validator: Validator<T>): T {
+    val value: T = receive()
+    validator.validate(value).throwIfInvalid { ValidationException(it.details()) }
+    return value
+}
+
+data class ValidationException(val details: List<ViolationDetail>) : RuntimeException()

api/src/validation/user/UserValidation.kt

@@ -0,0 +1,18 @@
+package be.vandewalleh.validation.user
+
+import am.ik.yavi.builder.ValidatorBuilder
+import am.ik.yavi.builder.konstraint
+import am.ik.yavi.core.Validator
+import be.vandewalleh.entities.User
+
+val registerValidator: Validator<User> = ValidatorBuilder.of<User>()
+    .konstraint(User::username) {
+        notNull().lessThanOrEqual(50).greaterThanOrEqual(3)
+    }
+    .konstraint(User::email) {
+        notNull().notEmpty().lessThanOrEqual(255).email()
+    }
+    .konstraint(User::password) {
+        notNull().greaterThanOrEqual(6)
+    }
+    .build()