Adding delete collection

src/IIIFPresentation/API.Tests/Integration/ModifyCollectionTests.cs

@@ -464,4 +464,114 @@ public async Task UpdateCollection_FailsToUpdateCollection_WhenCalledWithoutNeed
         // Assert
         response.StatusCode.Should().Be(HttpStatusCode.Forbidden);
     }
+
+    [Fact]
+    public async Task DeleteCollection_DeletesCollection_WhenAllValuesProvided()
+    {
+        // Arrange
+        var initialCollection = new Collection()
+        {
+            Id = "DeleteTester",
+            Slug = "delete-test",
+            UsePath = true,
+            Label = new LanguageMap
+            {
+                { "en", new List<string> { "update testing" } }
+            },
+            Thumbnail = "some/location",
+            Created = DateTime.UtcNow,
+            Modified = DateTime.UtcNow,
+            CreatedBy = "admin",
+            Tags = "some, tags",
+            IsStorageCollection = true,
+            IsPublic = false,
+            CustomerId = 1,
+            Parent = "RootStorage"
+        };
+
+        await dbContext.Collections.AddAsync(initialCollection);
+        await dbContext.SaveChangesAsync();
+
+
+        var deleteRequestMessage = HttpRequestMessageBuilder.GetPrivateRequest(HttpMethod.Delete,
+            $"{Customer}/collections/{initialCollection.Id}");
+
+        // Act
+        var response = await httpClient.AsCustomer(1).SendAsync(deleteRequestMessage);
+
+        var fromDatabase = dbContext.Collections.FirstOrDefault(c => c.Id == initialCollection.Id);
+
+        // Assert
+        response.StatusCode.Should().Be(HttpStatusCode.NoContent);
+        fromDatabase.Should().BeNull();
+    }
+
+    [Fact]
+    public async Task DeleteCollection_FailsToDeleteCollection_WhenNotFound()
+    {
+        // Arrange
+        var deleteRequestMessage = HttpRequestMessageBuilder.GetPrivateRequest(HttpMethod.Delete,
+            $"{Customer}/collections/doesNotExist");
+
+        // Act
+        var response = await httpClient.AsCustomer(1).SendAsync(deleteRequestMessage);
+
+        // Assert
+        response.StatusCode.Should().Be(HttpStatusCode.NotFound);
+    }
+
+    [Fact]
+    public async Task DeleteCollection_FailsToDeleteCollection_WhenAttemptingToDeleteRoot()
+    {
+        // Arrange
+        var deleteRequestMessage = HttpRequestMessageBuilder.GetPrivateRequest(HttpMethod.Delete,
+            $"{Customer}/collections/root");
+
+        // Act
+        var response = await httpClient.AsCustomer(1).SendAsync(deleteRequestMessage);
+
+        var errorResponse = await response.ReadAsPresentationResponseAsync<Error>();
+
+        // Assert
+        response.StatusCode.Should().Be(HttpStatusCode.BadRequest);
+        errorResponse!.ErrorTypeUri.Should().Be("http://localhost/errors/DeleteCollectionType/CannotDeleteRootCollection");
+        errorResponse.Detail.Should().Be("Cannot delete a root collection");
+    }
+
+
+    [Fact]
+    public async Task DeleteCollection_FailsToDeleteCollection_WhenAttemptingToDeleteRootDirectly()
+    {
+        // Arrange
+        var deleteRequestMessage = HttpRequestMessageBuilder.GetPrivateRequest(HttpMethod.Delete,
+            $"{Customer}/collections/RootStorage");
+
+        // Act
+        var response = await httpClient.AsCustomer(1).SendAsync(deleteRequestMessage);
+
+        var errorResponse = await response.ReadAsPresentationResponseAsync<Error>();
+
+        // Assert
+        response.StatusCode.Should().Be(HttpStatusCode.BadRequest);
+        errorResponse!.ErrorTypeUri.Should().Be("http://localhost/errors/DeleteCollectionType/CannotDeleteRootCollection");
+        errorResponse.Detail.Should().Be("Cannot delete a root collection");
+    }
+
+    [Fact]
+    public async Task DeleteCollection_FailsToDeleteCollection_WhenAttemptingToDeleteCollectionWithItems()
+    {
+        // Arrange
+        var deleteRequestMessage = HttpRequestMessageBuilder.GetPrivateRequest(HttpMethod.Delete,
+            $"{Customer}/collections/FirstChildCollection");
+
+        // Act
+        var response = await httpClient.AsCustomer(1).SendAsync(deleteRequestMessage);
+
+        var errorResponse = await response.ReadAsPresentationResponseAsync<Error>();
+
+        // Assert
+        response.StatusCode.Should().Be(HttpStatusCode.BadRequest);
+        errorResponse!.ErrorTypeUri.Should().Be("http://localhost/errors/DeleteCollectionType/CollectionNotEmpty");
+        errorResponse.Detail.Should().Be("Cannot delete a collection with child items");
+    }
 }

src/IIIFPresentation/API/Features/Storage/Requests/DeleteCollection.cs

@@ -0,0 +1,71 @@
+using Core;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+using Models.API.General;
+using Repository;
+
+namespace API.Features.Storage.Requests;
+
+public class DeleteCollection (int customerId, string collectionId) : IRequest<ResultMessage<DeleteResult, DeleteCollectionType>>
+{
+    public int CustomerId { get; } = customerId;
+
+    public string CollectionId { get; } = collectionId;
+}
+
+public class DeleteCollectionHandler(
+    PresentationContext dbContext,
+    ILogger<CreateCollection> logger)
+    : IRequestHandler<DeleteCollection, ResultMessage<DeleteResult, DeleteCollectionType>>
+{
+    private const string RootCollection = "root";
+
+    public async Task<ResultMessage<DeleteResult, DeleteCollectionType>> Handle(DeleteCollection request, CancellationToken cancellationToken)
+    {
+        logger.LogDebug("Deleting collection {CollectionId} for customer {CustomerId}", request.CollectionId,
+            request.CustomerId);
+
+        if (request.CollectionId.Equals(RootCollection, StringComparison.OrdinalIgnoreCase))
+        {
+            return new ResultMessage<DeleteResult, DeleteCollectionType>(DeleteResult.BadRequest,
+                DeleteCollectionType.CannotDeleteRootCollection, "Cannot delete a root collection");
+        }
+
+        var collection = await dbContext.Collections.FirstOrDefaultAsync(
+            c => c.Id == request.CollectionId && c.CustomerId == request.CustomerId,
+            cancellationToken: cancellationToken);
+
+        if (collection is null) return new ResultMessage<DeleteResult, DeleteCollectionType>(DeleteResult.NotFound);
+
+        if (collection.Parent is null)
+        {
+            return new ResultMessage<DeleteResult, DeleteCollectionType>(DeleteResult.BadRequest,
+                DeleteCollectionType.CannotDeleteRootCollection, "Cannot delete a root collection");
+        }
+
+        var hasItems = await dbContext.Collections.AnyAsync(
+            c => c.CustomerId == request.CustomerId && c.Parent == collection.Id,
+            cancellationToken: cancellationToken);
+
+        if (hasItems)
+        {
+            return new ResultMessage<DeleteResult, DeleteCollectionType>(DeleteResult.BadRequest,
+                DeleteCollectionType.CollectionNotEmpty, "Cannot delete a collection with child items");
+        }
+
+        dbContext.Collections.Remove(collection);
+        try
+        {
+            await dbContext.SaveChangesAsync(cancellationToken);
+        }
+        catch (DbUpdateConcurrencyException ex)
+        {
+            logger.LogError(ex, "Error attempting to delete collection {CollectionId} for customer {CustomerId}",
+                request.CollectionId, request.CustomerId);
+            return new ResultMessage<DeleteResult, DeleteCollectionType>(DeleteResult.Error,
+                DeleteCollectionType.Unknown, "Error deleting collection");
+        }
+
+        return new ResultMessage<DeleteResult, DeleteCollectionType>(DeleteResult.Deleted);
+    }
+}

src/IIIFPresentation/API/Features/Storage/StorageController.cs

@@ -27,7 +27,7 @@ public async Task<IActionResult> GetHierarchicalCollection(int customerId, strin
     {
         var storageRoot = await Mediator.Send(new GetHierarchicalCollection(customerId, slug));
 
-        if (storageRoot.Collection is not { IsPublic: true }) return NotFound();
+        if (storageRoot.Collection is not { IsPublic: true }) return this.PresentationNotFound();
 
         if (Request.ShowExtraProperties())
         {
@@ -51,15 +51,15 @@ public async Task<IActionResult> Get(int customerId, string id, int? page = 1, i
         var storageRoot =
             await Mediator.Send(new GetCollection(customerId, id, page.Value, pageSize.Value, orderBy, descending));
 
-        if (storageRoot.Collection == null) return NotFound();
+        if (storageRoot.Collection == null) return this.PresentationNotFound();
 
         if (Request.ShowExtraProperties())
         {
             return Ok(storageRoot.Collection.ToFlatCollection(GetUrlRoots(), pageSize.Value, page.Value,
                 storageRoot.TotalItems, storageRoot.Items, orderByField));
         }
 
-        return SeeOther(storageRoot.Collection.GenerateHierarchicalCollectionId(GetUrlRoots())); ;
+        return SeeOther(storageRoot.Collection.GenerateHierarchicalCollectionId(GetUrlRoots()));
     }
 
     [HttpPost("collections")]
@@ -69,7 +69,7 @@ public async Task<IActionResult> Post(int customerId, [FromBody] UpsertFlatColle
     {
         if (!Request.ShowExtraProperties())
         {
-            return Problem(statusCode: (int)HttpStatusCode.Forbidden);
+            return this.PresentationProblem(statusCode: (int)HttpStatusCode.Forbidden);
         }
 
         var validation = await validator.ValidateAsync(collection);
@@ -89,7 +89,7 @@ public async Task<IActionResult> Put(int customerId, string id, [FromBody] Upser
     {
         if (!Request.ShowExtraProperties())
         {
-            return Problem(statusCode: (int)HttpStatusCode.Forbidden);
+            return this.PresentationProblem(statusCode: (int)HttpStatusCode.Forbidden);
         }
 
         var validation = await validator.ValidateAsync(collection);
@@ -102,6 +102,17 @@ public async Task<IActionResult> Put(int customerId, string id, [FromBody] Upser
         return await HandleUpsert(new UpdateCollection(customerId, id, collection, GetUrlRoots()));
     }
 
+    [HttpDelete("collections/{id}")]
+    public async Task<IActionResult> Delete(int customerId, string id)
+    {
+        if (!Request.ShowExtraProperties())
+        {
+            return this.PresentationProblem(statusCode: (int)HttpStatusCode.Forbidden);
+        }
+
+        return await HandleDelete(new DeleteCollection(customerId, id));
+    }
+
     private IActionResult SeeOther(string location)
     {
         Response.Headers.Location = location;

src/IIIFPresentation/API/Infrastructure/ControllerBaseX.cs

@@ -6,6 +6,7 @@
 using Core.Helpers;
 using FluentValidation.Results;
 using Microsoft.AspNetCore.Mvc;
+using Models.API.General;
 
 namespace API.Infrastructure;
 
@@ -27,17 +28,17 @@ public static IActionResult FetchResultToHttpResult<T>(this ControllerBase contr
         where T : class
     {
         if (entityResult.Error)
-            return new ObjectResult(entityResult.ErrorMessage)
-            {
-                StatusCode = 500
-            };
+        {
+            return controller.PresentationProblem(detail: entityResult.ErrorMessage,
+                statusCode: (int)HttpStatusCode.InternalServerError);
+        }
 
-        if (entityResult.EntityNotFound || entityResult.Entity == null) return new NotFoundResult();
+        if (entityResult.EntityNotFound || entityResult.Entity == null) return controller.PresentationNotFound();
 
         return controller.Ok(entityResult.Entity);
     }
-    
-        /// <summary>
+
+    /// <summary>
     /// Create an IActionResult from specified ModifyEntityResult{T}.
     /// This will be the model + 200/201 on success. Or an
     /// error and appropriate status code if failed.
@@ -63,15 +64,15 @@ public static IActionResult ModifyResultToHttpResult<T>(this ControllerBase cont
             WriteResult.Updated => controller.Ok(entityResult.Entity),
             WriteResult.Created => controller.Created(controller.Request.GetDisplayUrl(), entityResult.Entity),
             WriteResult.NotFound => controller.NotFound(entityResult.Error),
-            WriteResult.Error => controller.Problem(entityResult.Error, instance, (int)HttpStatusCode.InternalServerError, errorTitle),
-            WriteResult.BadRequest => controller.Problem(entityResult.Error, instance, (int)HttpStatusCode.BadRequest, errorTitle),
-            WriteResult.Conflict => controller.Problem(entityResult.Error, instance, (int)HttpStatusCode.Conflict, 
+            WriteResult.Error => controller.PresentationProblem(entityResult.Error, instance, (int)HttpStatusCode.InternalServerError, errorTitle),
+            WriteResult.BadRequest => controller.PresentationProblem(entityResult.Error, instance, (int)HttpStatusCode.BadRequest, errorTitle),
+            WriteResult.Conflict => controller.PresentationProblem(entityResult.Error, instance, (int)HttpStatusCode.Conflict, 
                 $"{errorTitle}: Conflict"),
-            WriteResult.FailedValidation => controller.Problem(entityResult.Error, instance, (int)HttpStatusCode.BadRequest,
+            WriteResult.FailedValidation => controller.PresentationProblem(entityResult.Error, instance, (int)HttpStatusCode.BadRequest,
                 $"{errorTitle}: Validation failed"),
-            WriteResult.StorageLimitExceeded => controller.Problem(entityResult.Error, instance, (int)HttpStatusCode.InsufficientStorage,
+            WriteResult.StorageLimitExceeded => controller.PresentationProblem(entityResult.Error, instance, (int)HttpStatusCode.InsufficientStorage,
                 $"{errorTitle}: Storage limit exceeded"),
-            _ => controller.Problem(entityResult.Error, instance, (int)HttpStatusCode.InternalServerError, errorTitle),
+            _ => controller.PresentationProblem(entityResult.Error, instance, (int)HttpStatusCode.InternalServerError, errorTitle),
         };
 
         /// <summary>
@@ -105,4 +106,45 @@ public static ObjectResult ValidationFailed(this ControllerBase controller, Vali
 
             return orderByField;
         }
+
+        /// <summary>
+        /// Creates an <see cref="ObjectResult"/> that produces a <see cref="Error"/> response.
+        /// </summary>
+        /// <param name="statusCode">The value for <see cref="Error.Status" />.</param>
+        /// <param name="detail">The value for <see cref="Error.Detail" />.</param>
+        /// <param name="instance">The value for <see cref="Error.Instance" />.</param>
+        /// <param name="title">The value for <see cref="Error.Title" />.</param>
+        /// <param name="type">The value for <see cref="Error.Type" />.</param>
+        /// <returns>The created <see cref="ObjectResult"/> for the response.</returns>
+        public static ObjectResult PresentationProblem(
+            this ControllerBase controller,
+            string? detail = null,
+            string? instance = null,
+            int? statusCode = null,
+            string? title = null,
+            string? type = null)
+        {
+            var error = new Error
+            {
+                Detail = detail,
+                Instance = instance ?? controller.Request.GetDisplayUrl(),
+                Status = statusCode ?? 500,
+                Title = title,
+                ErrorTypeUri = type
+            };
+
+            return new ObjectResult(error)
+            {
+                StatusCode = error.Status
+            };
+        }
+
+        /// <summary> 
+        /// Creates an <see cref="ObjectResult"/> that produces a <see cref="Error"/> response with 404 status code.
+        /// </summary>
+        /// <returns>The created <see cref="ObjectResult"/> for the response.</returns>
+        public static ObjectResult PresentationNotFound(this ControllerBase controller, string? detail = null)
+        {
+            return controller.PresentationProblem(detail, null, (int)HttpStatusCode.NotFound, "Not Found");
+        }
 }