Adds messages api

src/Web/Messages/Handlers/PostMessage.cs

@@ -0,0 +1,34 @@
+using FastEndpoints;
+using Hutopy.Web.Messages.Data;
+
+namespace Hutopy.Web.Messages.Handlers;
+
+public record PostMessageRequest(
+    Guid ContentId,
+    string Message);
+
+public class PostMessage(
+    MessagingDbContext context)
+    : Endpoint<PostMessageRequest>
+{
+    public override void Configure()
+    {
+        // TODO: Find how to specify the name we see in Swagger
+        Tags("Messages");
+        Post("/api/messages");
+    }
+
+    public override async Task HandleAsync(
+        PostMessageRequest req,
+        CancellationToken ct)
+    {
+        await context.Messages.AddAsync(
+            new Message { 
+                ContentId = req.ContentId, 
+                CreatedBy = User.GetUserId(),
+                Value = req.Message },
+            ct);
+
+        await context.SaveChangesAsync(ct);
+    }
+}