1 files changed, 39 insertions, 0 deletions
diff --git a/code/api/src/Utilities/PaginationOperationFilter.cs b/code/api/src/Utilities/PaginationOperationFilter.cs
new file mode 100644
index 0000000..ad02a3d
--- /dev/null
+++ b/code/api/src/Utilities/PaginationOperationFilter.cs
@@ -0,0 +1,39 @@
+using Microsoft.Extensions.Options;
+using MR.AspNetCore.Pagination;
+using Swashbuckle.AspNetCore.SwaggerGen;
+
+namespace IOL.GreatOffice.Api.Utilities;
+
+public class PaginationOperationFilter : IOperationFilter
+{
+    private readonly PaginationOptions _paginationOptions;
+
+    public PaginationOperationFilter(
+        IOptions<PaginationOptions> paginationOptions) {
+        _paginationOptions = paginationOptions.Value;
+    }
+
+    public void Apply(OpenApiOperation operation, OperationFilterContext context) {
+        var boolSchema = context.SchemaGenerator.GenerateSchema(typeof(bool), context.SchemaRepository);
+        var intSchema = context.SchemaGenerator.GenerateSchema(typeof(int), context.SchemaRepository);
+
+        if (PaginationActionDetector.IsKeysetPaginationResultAction(context.MethodInfo, out _)) {
+            CreateParameter(_paginationOptions.FirstQueryParameterName, "true if you want the first page", boolSchema);
+            CreateParameter(_paginationOptions.BeforeQueryParameterName, "Id of the reference entity you want results before");
+            CreateParameter(_paginationOptions.AfterQueryParameterName, "Id of the reference entity you want results after");
+            CreateParameter(_paginationOptions.LastQueryParameterName, "true if you want the last page", boolSchema);
+        } else if (PaginationActionDetector.IsOffsetPaginationResultAction(context.MethodInfo, out _)) {
+            CreateParameter(_paginationOptions.PageQueryParameterName, "The page", intSchema);
+        }
+
+        void CreateParameter(string name, string description, OpenApiSchema schema = null) {
+            operation.Parameters.Add(new OpenApiParameter {
+                Required = false,
+                In = ParameterLocation.Query,
+                Name = name,
+                Description = description,
+                Schema = schema,
+            });
+        }
+    }
+}
+\ No newline at end of file