Added Upload Scalar

Author: michaelstaib

code/complete/GraphQL/Speakers/SpeakerMutations.cs

@@ -1,3 +1,4 @@
+using System.IO;
 using System.Threading;
 using System.Threading.Tasks;
 using ConferencePlanner.GraphQL.Common;
@@ -68,5 +69,22 @@ public async Task<ModifySpeakerPayload> ModifySpeakerAsync(
 
             return new ModifySpeakerPayload(speaker);
         }
+
+        [UseApplicationDbContext]
+        public async Task<UploadSpeakerPhotoPayload> UploadSpeakerPhotoAsync(
+            UploadSpeakerPhotoInput input,
+            [ScopedService] ApplicationDbContext context,
+            CancellationToken cancellationToken)
+        {
+            Speaker? speaker = await context.Speakers.FindAsync(input.Id);
+
+            if (speaker is null)
+            {
+                return new UploadSpeakerPhotoPayload(
+                    new UserError("Speaker with id not found.", "SPEAKER_NOT_FOUND"));
+            }
+
+            return new UploadSpeakerPhotoPayload(speaker);
+        }
     }
 }

code/complete/GraphQL/Speakers/UploadSpeakerPhotoInput.cs

@@ -0,0 +1,6 @@
+using HotChocolate.Types;
+
+namespace ConferencePlanner.GraphQL.Speakers
+{
+    public record UploadSpeakerPhotoInput(int Id, IFile Photo);
+}

code/complete/GraphQL/Speakers/UploadSpeakerPhotoPayload.cs

@@ -0,0 +1,18 @@
+using ConferencePlanner.GraphQL.Common;
+using ConferencePlanner.GraphQL.Data;
+
+namespace ConferencePlanner.GraphQL.Speakers
+{
+    public class UploadSpeakerPhotoPayload : SpeakerPayloadBase
+    {
+        public UploadSpeakerPhotoPayload(Speaker speaker) 
+            : base(speaker)
+        {
+        }
+
+        public UploadSpeakerPhotoPayload(UserError error) 
+            : base(new[] { error })
+        {
+        }
+    }
+}

code/complete/GraphQL/Startup.cs

@@ -78,6 +78,8 @@ public void ConfigureServices(IServiceCollection services)
                 .AddTypeExtension<TrackNode>()
                 .AddDataLoader<TrackByIdDataLoader>()
 
+                .AddType<UploadType>()
+
                 // In this section we are adding extensions like relay helpers,
                 // filtering and sorting.
                 .AddFiltering()