refactor/ (ResourceDocMiddleware): ensure JSON content type for responses

- Introduced a new private method to enforce JSON content type on responses.
- Added `Content-Type` import and defined a constant for application/json.
- Updated response handling to apply JSON content type if not already set.

obp-api/src/main/scala/code/api/util/http4s/ResourceDocMiddleware.scala

@@ -13,6 +13,7 @@ import code.api.util.{CallContext => SharedCallContext}
 import com.openbankproject.commons.model.{Bank, BankAccount, BankId, AccountId, ViewId, BankIdAccountId, CounterpartyTrait, User, View}
 import net.liftweb.common.{Box, Empty, Full, Failure => LiftFailure}
 import org.http4s._
+import org.http4s.headers.`Content-Type`
 
 import scala.collection.mutable.ArrayBuffer
 import scala.language.higherKinds
@@ -34,6 +35,7 @@ object ResourceDocMiddleware extends MdcLoggable{
   
   type HttpF[A] = OptionT[IO, A]
   type Middleware[F[_]] = HttpRoutes[F] => HttpRoutes[F]
+  private val jsonContentType: `Content-Type` = `Content-Type`(MediaType.application.json)
   
   /**
    * Check if ResourceDoc requires authentication based on errorResponseBodies
@@ -68,11 +70,16 @@ object ResourceDocMiddleware extends MdcLoggable{
           val ccWithDoc = ResourceDocMatcher.attachToCallContext(cc, resourceDoc)
           val pathParams = ResourceDocMatcher.extractPathParams(req.uri.path, resourceDoc)
           runValidationChain(req, resourceDoc, ccWithDoc, pathParams, routes)
+            .map(ensureJsonContentType)
         case None =>
           routes.run(req).getOrElseF(IO.pure(Response[IO](org.http4s.Status.NotFound)))
       }
     } yield response
   }
+
+  private def ensureJsonContentType(response: Response[IO]): Response[IO] = {
+    if (response.contentType.isDefined) response else response.withContentType(jsonContentType)
+  }
   
   /**
    * Run the validation chain in order: auth → bank → account → view → roles → counterparty

obp-api/src/main/scala/code/api/v7_0_0/Http4s700.scala

@@ -6,11 +6,11 @@ import code.api.Constant._
 import code.api.ResourceDocs1_4_0.SwaggerDefinitionsJSON._
 import code.api.ResourceDocs1_4_0.{ResourceDocs140, ResourceDocsAPIMethodsUtil}
 import code.api.util.APIUtil.{EmptyBody, _}
+import code.api.util.ApiRole.canReadResourceDoc
 import code.api.util.ApiTag._
 import code.api.util.ErrorMessages._
-import code.api.util.{ApiRole, ApiVersionUtils, CallContext, CustomJsonFormats, NewStyle}
-import code.api.util.ApiRole.canReadResourceDoc
-import code.api.util.http4s.{Http4sCallContextBuilder, Http4sVaultKeys, ResourceDocMiddleware, ErrorResponseConverter}
+import code.api.util.http4s.{Http4sCallContextBuilder, ResourceDocMiddleware}
+import code.api.util.{ApiRole, ApiVersionUtils, CustomJsonFormats, NewStyle}
 import code.api.v1_4_0.JSONFactory1_4_0
 import code.api.v4_0_0.JSONFactory400
 import com.github.dwickern.macros.NameOf.nameOf
@@ -20,9 +20,7 @@ import net.liftweb.json.JsonAST.prettyRender
 import net.liftweb.json.{Extraction, Formats}
 import org.http4s._
 import org.http4s.dsl.io._
-import org.http4s.headers._
 
-import java.util.UUID
 import scala.collection.mutable.ArrayBuffer
 import scala.concurrent.Future
 import scala.language.{higherKinds, implicitConversions}
@@ -42,8 +40,6 @@ object Http4s700 {
 
     // Common prefix: /obp/v7.0.0
     val prefixPath = Root / ApiPathZero.toString / implementedInApiVersion.toString
-    private val jsonContentType: `Content-Type` = `Content-Type`(MediaType.application.json)
-
 
     // ResourceDoc with $UserNotLoggedIn in errorResponseBodies indicates auth is required
     // ResourceDocMiddleware will automatically handle authentication based on this metadata
@@ -80,7 +76,7 @@ object Http4s700 {
           JSONFactory700.getApiInfoJSON(implementedInApiVersion, versionStatus)
         )
         
-        Ok(responseJson).map(_.withContentType(jsonContentType))
+        Ok(responseJson)
     }
 
     resourceDocs += ResourceDoc(
@@ -117,7 +113,7 @@ object Http4s700 {
             } yield convertAnyToJsonString(JSONFactory400.createBanksJson(banks))
           })
         } yield result
-        Ok(response).map(_.withContentType(jsonContentType))
+        Ok(response)
     }
 
     val getResourceDocsObpV700: HttpRoutes[IO] = HttpRoutes.of[IO] {
@@ -160,7 +156,7 @@ object Http4s700 {
             } yield convertAnyToJsonString(resourceDocsJson)
           })
         } yield result
-        Ok(response).map(_.withContentType(jsonContentType))
+        Ok(response)
     }
     
     // Example endpoint demonstrating full validation chain with ResourceDocMiddleware
@@ -200,7 +196,7 @@ object Http4s700 {
             "view_id" -> viewId
           )
         )
-        Ok(responseJson).map(_.withContentType(jsonContentType))
+        Ok(responseJson)
     }
 
     resourceDocs += ResourceDoc(
@@ -239,7 +235,7 @@ object Http4s700 {
             "counterparty_id" -> counterpartyId
           )
         )
-        Ok(responseJson).map(_.withContentType(jsonContentType))
+        Ok(responseJson)
     }
 
     // All routes combined (without middleware - for direct use)