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MutationConventionMiddleware.cs
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MutationConventionMiddleware.cs
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using System.Linq;
#nullable enable
namespace HotChocolate.Types;
/// <summary>
/// This middleware ensures that the rewritten argument structure is remapped so that the
/// resolver can request the arguments in the original structure.
/// </summary>
internal sealed class MutationConventionMiddleware
{
private readonly FieldDelegate _next;
private readonly string _inputArgumentName;
private readonly IReadOnlyList<ResolverArgument> _resolverArguments;
public MutationConventionMiddleware(
FieldDelegate next,
string inputArgumentName,
IReadOnlyList<ResolverArgument> resolverArguments)
{
_next = next ??
throw new ArgumentNullException(nameof(next));
_inputArgumentName = inputArgumentName ??
throw new ArgumentNullException(nameof(inputArgumentName));
_resolverArguments = resolverArguments ??
throw new ArgumentNullException(nameof(resolverArguments));
}
public async ValueTask InvokeAsync(IMiddlewareContext context)
{
var input = context.ArgumentValue<IDictionary<string, object?>>(_inputArgumentName);
var inputLiteral = context.ArgumentLiteral<ObjectValueNode>(_inputArgumentName)
.Fields.ToDictionary(t => t.Name.Value, t => t.Value);
var arguments = new Dictionary<string, ArgumentValue>(StringComparer.Ordinal);
var preservedArguments = context.ReplaceArguments(arguments);
var inputArgument = preservedArguments[_inputArgumentName];
foreach (var argument in _resolverArguments)
{
input.TryGetValue(argument.Name, out var value);
inputLiteral.TryGetValue(argument.Name, out var valueLiteral);
valueLiteral ??= NullValueNode.Default;
if (!valueLiteral.TryGetValueKind(out var kind))
{
kind = ValueKind.Unknown;
}
arguments.Add(
argument.Name,
new ArgumentValue(
argument,
kind,
true,
inputArgument.IsDefaultValue,
value,
valueLiteral));
}
try
{
await _next(context);
context.Result ??= Null;
}
finally
{
context.ReplaceArguments(preservedArguments);
}
}
internal static object Null { get; } = new();
}