Started integrating filters into linksheader

Domain/Sia.Shared/Data/DataFilters.cs

@@ -1,4 +1,6 @@
-using System;
+using Microsoft.Extensions.Primitives;
+using Newtonsoft.Json;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -24,5 +26,12 @@ namespace Sia.Shared.Data
             }
             return working;
         }
+        public abstract StringValues NonDataFilterValues();
+        public override StringValues FilterValues() => StringValues.Concat(NonDataFilterValues(), _dataFilterValues());
+        private StringValues _dataFilterValues() => JsonConvert.SerializeObject(new
+        {
+            DataKey = DataKey,
+            DataValue = DataValue
+        });
     }
 }

Domain/Sia.Shared/Data/Filters.cs

@@ -1,4 +1,5 @@
-using Sia.Shared.Data;
+using Microsoft.Extensions.Primitives;
+using Sia.Shared.Data;
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -9,6 +10,7 @@ namespace Sia.Shared.Data
     public abstract class Filters<T>
     {
         public abstract IQueryable<T> Filter(IQueryable<T> source);
+        public abstract StringValues FilterValues();
     }
 }
 

Domain/Sia.Shared/Protocol/FilteredLinksHeader.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Primitives;
+using Sia.Shared.Data;
+using Newtonsoft.Json;
+
+namespace Sia.Shared.Protocol
+{
+    public class FilteredLinksHeader<T> : LinksHeader
+    {
+        public FilteredLinksHeader(Filters<T> filterMetadata, PaginationMetadata metadata, IUrlHelper urlHelper, string routeName)
+            : base(metadata, urlHelper, routeName)
+        {
+            _filterMetadata = filterMetadata;
+        }
+
+        private Filters<T> _filterMetadata;
+
+        public override StringValues HeaderValues
+            => StringValues.Concat(base.HeaderValues, _filterMetadata.FilterValues());
+    }
+}

Domain/Sia.Shared/Protocol/LinksHeader.cs

@@ -18,7 +18,10 @@ namespace Sia.Shared.Protocol
         }
 
         public const string HeaderName = "links";
-        public StringValues HeaderValues => JsonConvert.SerializeObject(new
+        public virtual StringValues HeaderValues =>
+            _baseHeaderValues;
+
+        private StringValues _baseHeaderValues => JsonConvert.SerializeObject(new
         {
             PageNumber = _metadata.PageNumber,
             PageSize = _metadata.PageSize,

Domain/Sia.Shared/Protocol/PaginationMetadata.cs

@@ -1,4 +1,6 @@
-using Sia.Shared.Protocol;
+using Microsoft.Extensions.Primitives;
+using Newtonsoft.Json;
+using Sia.Shared.Protocol;
 
 namespace Sia.Shared.Protocol
 {
@@ -8,17 +10,17 @@ namespace Sia.Shared.Protocol
         public int PageSize { get; set; } = 50;
         public long TotalRecords { get; set; }
         public long TotalPages => (TotalRecords / PageSize) + (TotalRecords % PageSize > 0 ? 1 : 0);
-        public object PreviousPageLinkInfo => PreviousPageExists ? new
+        public StringValues PreviousPageLinkInfo => PreviousPageExists ? JsonConvert.SerializeObject(new
         {
             PageNumber = PageNumber - 1,
             PageSize = PageSize
-        } : null;
+        }) : null;
 
-        public object NextPageLinkInfo => NextPageExists ? new
+        public StringValues NextPageLinkInfo => NextPageExists ? JsonConvert.SerializeObject(new
         {
             PageNumber = PageNumber + 1,
             PageSize = PageSize
-        } : null;
+        }) : null;
 
         public bool PreviousPageExists => PageNumber > 1;
         public bool NextPageExists => PageNumber < TotalPages;