Add middleware options

Author: JannikLassahn

src/GraphQL.Upload.AspNetCore/GraphQL.Upload.AspNetCore.csproj

@@ -1,7 +1,14 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp2.2</TargetFramework>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <Version>0.1.0</Version>
+    <Authors>Jannik Lassahn</Authors>
+    <Company />
+    <RepositoryUrl>https://github.com/JannikLassahn/graphql-dotnet-upload</RepositoryUrl>
+    <PackageLicenseExpression>MIT</PackageLicenseExpression>
+    <PackageProjectUrl>https://github.com/JannikLassahn/graphql-dotnet-upload</PackageProjectUrl>
+    <Description>Middleware and an Upload scalar to add support for GraphQL multipart requests for ASP.NET Core</Description>
   </PropertyGroup>
 
   <ItemGroup>

src/GraphQL.Upload.AspNetCore/GraphQLRequest.cs

@@ -0,0 +1,62 @@
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using System.Collections.Generic;
+
+namespace GraphQL.Upload.AspNetCore
+{
+    internal class GraphQLRequest
+    {
+        public const string QueryKey = "query";
+        public const string VariablesKey = "variables";
+        public const string OperationNameKey = "operationName";
+        public const string MapKey = "map";
+
+        [JsonProperty(QueryKey)]
+        public string Query { get; set; }
+
+        [JsonProperty(VariablesKey)]
+        public JObject Variables { get; set; }
+
+        [JsonProperty(OperationNameKey)]
+        public string OperationName { get; set; }
+
+        [JsonIgnore]
+        public List<Meta> TokensToReplace { get; set; }
+
+        public Inputs GetInputs()
+        {
+            var variables = Variables?.ToInputs();
+
+            // the following implementation seems brittle because of a lot of casting
+            // and it depends on the types that ToInputs() creates.
+
+            foreach (var info in TokensToReplace)
+            {
+                int i = 0;
+                object o = variables;
+
+                foreach (var p in info.Parts)
+                {
+                    var isLast = i++ == info.Parts.Count - 1;
+
+                    if (p is string s)
+                    {
+                        if (isLast)
+                            ((Inputs)o)[s] = info.File;
+                        else
+                            o = ((Inputs)o)[s];
+                    }
+                    else if (p is int index)
+                    {
+                        if (isLast)
+                            ((List<object>)o)[index] = info.File;
+                        else
+                            o = ((List<object>)o)[index];
+                    }
+                }
+            }
+
+            return variables;
+        }
+    }
+}