Disabling introspection when multiple schemas are used

[IvanInvenit]

I use GraphQL.Server.All v8.0.2 and ASP.NET Core 8. In my project there are two schemas, each on its own URL. I will refer to them as Schema1 (accessible on /s1/graphql) and Schema2 (accessible on /s2/graphql) for simplicity. I would like to disable introspection only on Schema2. I wrote a custom validation rule according to the docs:

public class NoIntrospectionValidationRule : ValidationRuleBase, INodeVisitor
{
    public override ValueTask<INodeVisitor?> GetPreNodeVisitorAsync(ValidationContext context) => new(this);

    ValueTask INodeVisitor.EnterAsync(ASTNode node, ValidationContext context)
    {
        if (node is GraphQLField field)
        {
            if (field.Name.Value == "__schema" || field.Name.Value == "__type")
                context.ReportError(new NoIntrospectionError(context.Document.Source, field));
        }
        return default;
    }

    ValueTask INodeVisitor.LeaveAsync(ASTNode node, ValidationContext context) => default;
}

How can i add this rule to just Schema2?

[Shane32]

FYI, NoIntrospectionValidationRule is already included in the namespace GraphQL.Validation.Rules.Custom (at least in v8 it is). Perhaps our docs need to be updated.

[Shane32]

I think this should work:

services.AddGraphQL(b => b
    // existing code to register schemas, etc
    .AddSchema<Schema1>()
    .AddSchema<Schema2>()
    // configure a validation rule for a single schema
    .ConfigureExecutionOptions(o =>
    {
        if (o.Schema is Schema2)
        {
            o.ValidationRules = (o.ValidationRules ?? DocumentValidator.CoreRules).Append(NoIntrospectionValidationRule.Instance);
        }
    })
    // other stuff
    .AddSystemTextJson());

[IvanInvenit]

It works indeed, thank you very much!