Add mediatr request for getting delivery channel policy collections, …

…remove redundant exception definition from DeliveryChannelPolicyDataValidator

src/protagonist/API/Features/DeliveryChannels/DeliveryChannelPoliciesController.cs

@@ -44,39 +44,13 @@ public DeliveryChannelPoliciesController(
     [HttpGet]
     [ProducesResponseType(StatusCodes.Status200OK)]
     public async Task<IActionResult> GetDeliveryChannelPolicyCollections(
-        [FromRoute] int customerId)
+        [FromRoute] int customerId,
+        CancellationToken cancellationToken)
     {
-        var baseUrl = Request.GetDisplayUrl(Request.Path);
-
-        var hydraPolicyCollections = new List<HydraNestedCollection<DeliveryChannelPolicy>>()
-        {
-            new(baseUrl, AssetDeliveryChannels.Image)
-            {
-                Title = "Policies for IIIF Image service delivery",
-            },
-            new(baseUrl, AssetDeliveryChannels.Thumbnails)
-            {
-                Title = "Policies for thumbnails as IIIF Image Services",
-            },
-            new(baseUrl, AssetDeliveryChannels.Timebased)
-            {
-                Title = "Policies for Audio and Video delivery",
-            },
-            new(baseUrl, AssetDeliveryChannels.File)
-            {
-                Title = "Policies for File delivery",
-            }
-        };
-
-        var result = new HydraCollection<HydraNestedCollection<DeliveryChannelPolicy>>()
-        {
-            WithContext = true,
-            Members = hydraPolicyCollections.ToArray(),
-            TotalItems = hydraPolicyCollections.Count,
-            Id = Request.GetJsonLdId()
-        };
+        var request = new GetDeliveryChannelPolicyCollections(customerId, Request.GetDisplayUrl(Request.Path), Request.GetJsonLdId());
+        var result = await Mediator.Send(request, cancellationToken);
 
-        return new OkObjectResult(result);
+        return Ok(result);
     }
 
     /// <summary>

src/protagonist/API/Features/DeliveryChannels/Requests/GetDeliveryChannelPolicyCollections.cs

@@ -0,0 +1,62 @@
+using DLCS.Model.Assets;
+using DLCS.Model.Policies;
+using DLCS.Repository;
+using Hydra.Collections;
+using MediatR;
+
+namespace API.Features.DeliveryChannels.Requests;
+
+public class GetDeliveryChannelPolicyCollections: IRequest<HydraCollection<HydraNestedCollection<DeliveryChannelPolicy>>>
+{
+    public int CustomerId { get; }
+    public string BaseUrl { get; }
+    public string JsonLdId { get; }
+
+    public GetDeliveryChannelPolicyCollections(int customerId, string baseUrl, string jsonLdId)
+    {
+        CustomerId = customerId;
+        BaseUrl = baseUrl;
+        JsonLdId = jsonLdId;
+    }
+}
+
+public class GetDeliveryChannelPolicyCollectionsHandler : IRequestHandler<GetDeliveryChannelPolicyCollections, HydraCollection<HydraNestedCollection<DeliveryChannelPolicy>>>
+{
+    private readonly DlcsContext dbContext;
+
+    public GetDeliveryChannelPolicyCollectionsHandler(DlcsContext dbContext)
+    {
+        this.dbContext = dbContext;
+    }
+
+    public async Task<HydraCollection<HydraNestedCollection<DeliveryChannelPolicy>>> Handle(GetDeliveryChannelPolicyCollections request, CancellationToken cancellationToken)
+    {
+        var policyCollections = new HydraNestedCollection<DeliveryChannelPolicy>[]
+        {
+            new(request.BaseUrl, AssetDeliveryChannels.Image)
+            {
+                Title = "Policies for IIIF Image service delivery",
+            },
+            new(request.BaseUrl, AssetDeliveryChannels.Thumbnails)
+            {
+                Title = "Policies for thumbnails as IIIF Image Services",
+            },
+            new(request.BaseUrl, AssetDeliveryChannels.Timebased)
+            {
+                Title = "Policies for Audio and Video delivery",
+            },
+            new(request.BaseUrl, AssetDeliveryChannels.File)
+            {
+                Title = "Policies for File delivery",
+            }
+        };
+
+        return new HydraCollection<HydraNestedCollection<DeliveryChannelPolicy>>()
+        {
+            WithContext = true,
+            Members = policyCollections,
+            TotalItems = policyCollections.Length,
+            Id = request.JsonLdId,
+        };
+    }
+}

src/protagonist/API/Features/DeliveryChannels/Validation/DeliveryChannelPolicyDataValidator.cs

@@ -24,7 +24,7 @@ public bool Validate(string policyDataJson, string channel)
         {
             policyData = JsonSerializer.Deserialize<string[]>(policyDataJson);
         }
-        catch(JsonException ex)
+        catch(JsonException)
         {
             return null;
         }