feat: add release communications

backend/src/Socialize.Api/Modules/ReleaseCommunications/Handlers/ListReleaseUpdates.cs

@@ -0,0 +1,50 @@
+using FastEndpoints;
+using Microsoft.EntityFrameworkCore;
+using Socialize.Api.Data;
+using Socialize.Api.Infrastructure.Security;
+using Socialize.Api.Modules.ReleaseCommunications.Contracts;
+using Socialize.Api.Modules.ReleaseCommunications.Data;
+using Socialize.Api.Modules.ReleaseCommunications.Services;
+
+namespace Socialize.Api.Modules.ReleaseCommunications.Handlers;
+
+internal class ListReleaseUpdatesHandler(AppDbContext dbContext)
+    : EndpointWithoutRequest<IReadOnlyCollection<ReleaseUpdateDto>>
+{
+    public override void Configure()
+    {
+        Get("/api/release-updates");
+        Options(o => o.WithTags("Release Communications"));
+    }
+
+    public override async Task HandleAsync(CancellationToken ct)
+    {
+        Guid userId = User.GetUserId();
+        ReleaseUpdateAudienceContext audienceContext =
+            await ReleaseUpdateVisibility.GetAudienceContextAsync(dbContext, User, userId, ct);
+
+        List<ReleaseUpdate> updates = await dbContext.ReleaseUpdates
+            .VisibleTo(audienceContext)
+            .OrderByDescending(update => update.PublishedAt)
+            .ThenByDescending(update => update.CreatedAt)
+            .ToListAsync(ct);
+
+        HashSet<Guid> readUpdateIds = await GetReadUpdateIdsAsync(userId, updates.Select(update => update.Id), ct);
+
+        await SendOkAsync(
+            updates.Select(update => update.ToDto(readUpdateIds.Contains(update.Id))).ToArray(),
+            ct);
+    }
+
+    private async Task<HashSet<Guid>> GetReadUpdateIdsAsync(
+        Guid userId,
+        IEnumerable<Guid> updateIds,
+        CancellationToken ct)
+    {
+        Guid[] ids = updateIds.ToArray();
+        return await dbContext.ReleaseUpdateReadReceipts
+            .Where(receipt => receipt.UserId == userId && ids.Contains(receipt.ReleaseUpdateId))
+            .Select(receipt => receipt.ReleaseUpdateId)
+            .ToHashSetAsync(ct);
+    }
+}