Add validation on route FindCitizens

src/main/kotlin/fr/dcproject/component/citizen/routes/FindCitizens.kt

@@ -1,5 +1,6 @@
 package fr.dcproject.component.citizen.routes
 
+import fr.dcproject.application.http.badRequestIfNotValid
 import fr.dcproject.common.response.toOutput
 import fr.dcproject.common.security.assert
 import fr.dcproject.component.auth.citizenOrNull
@@ -10,6 +11,10 @@ import fr.dcproject.component.citizen.database.CitizenRepository
 import fr.dcproject.routes.PaginatedRequest
 import fr.dcproject.routes.PaginatedRequestI
 import fr.postgresjson.repository.RepositoryI
+import io.konform.validation.Validation
+import io.konform.validation.jsonschema.enum
+import io.konform.validation.jsonschema.maximum
+import io.konform.validation.jsonschema.minimum
 import io.ktor.application.call
 import io.ktor.locations.KtorExperimentalLocationsAPI
 import io.ktor.locations.Location
@@ -27,11 +32,28 @@ object FindCitizens {
         val sort: String? = null,
         val direction: RepositoryI.Direction? = null,
         val search: String? = null
-    ) : PaginatedRequestI by PaginatedRequest(page, limit)
+    ) : PaginatedRequestI by PaginatedRequest(page, limit) {
+        fun validate() = Validation<CitizensRequest> {
+            CitizensRequest::page {
+                minimum(1)
+            }
+            CitizensRequest::limit {
+                minimum(1)
+                maximum(50)
+            }
+            CitizensRequest::sort ifPresent {
+                enum(
+                    "title",
+                    "createdAt",
+                )
+            }
+        }.validate(this)
+    }
 
     fun Route.findCitizen(ac: CitizenAccessControl, repo: CitizenRepository) {
         get<CitizensRequest> {
             mustBeAuth()
+            it.validate().badRequestIfNotValid()
             val citizens = repo.find(it.page, it.limit, it.sort, it.direction, it.search)
             ac.assert { canView(citizens.result, citizenOrNull) }
             call.respond(