Avoid duplicates

core/Repositories/Abstractions/IReportRepository.cs

@@ -4,4 +4,5 @@ namespace api.core.repositories.abstractions;
 
 public interface IReportRepository: IRepository<Report>
 {
+    public IEnumerable<Report> GetRecentReports(int lastSeconds);
 }

core/Repositories/ReportRepository.cs

@@ -47,8 +47,14 @@ public bool Delete(Report entity)
     public IEnumerable<Report> GetAll()
     {
         return context.Reports
-            .Include(r => r.Publication)
-            .ToList();
+            .Include(r => r.Publication);
+    }
+
+    public IEnumerable<Report> GetRecentReports(int lastSeconds)
+    {
+        return context.Reports
+            .Where(r => r.CreatedAt >= DateTime.UtcNow.AddSeconds(-lastSeconds))
+            .Include(r => r.Publication);
     }
 
     public bool Update(Guid id, Report entity)

core/Services/ReportService.cs

@@ -5,6 +5,7 @@
 using api.core.repositories.abstractions;
 using api.core.services.abstractions;
 
+
 namespace api.core.Services;
 
 public class ReportService(IEventRepository eventRepository, IReportRepository reportRepository) : IReportService
@@ -17,6 +18,8 @@ public IEnumerable<ReportResponseDTO> GetReports()
 
     public void ReportEvent(Guid eventId, CreateReportRequestDTO request)
     {
+        if (AvoidDuplicates(request)) return;
+
         var evnt = eventRepository.Get(eventId);
         NotFoundException<Event>.ThrowIfNull(evnt);
 
@@ -30,4 +33,13 @@ public void ReportEvent(Guid eventId, CreateReportRequestDTO request)
         };
         reportRepository.Add(report);
     }
+
+    private bool AvoidDuplicates(CreateReportRequestDTO request)
+    {
+        // If a request with a duplicated reason is submitted within the time window of the rate limiter,
+        // we ignore the request
+        var timeWindow = int.Parse(Environment.GetEnvironmentVariable("RATE_LIMIT_TIME_WINDOW_SECONDS") ?? "10");
+        var reports = reportRepository.GetRecentReports(timeWindow);
+        return reports.Any(r => r.Reason == request.Reason);
+    }
 }