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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,
});
}
}
}
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