async-graphql 1.6.3

The GraphQL server library implemented by rust
Documentation 
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use crate::validation::visitor::{Visitor, VisitorContext};
use graphql_parser::query::OperationDefinition;

#[derive(Default)]
pub struct UploadFile;

impl<'a> Visitor<'a> for UploadFile {
    fn enter_operation_definition(
        &mut self,
        ctx: &mut VisitorContext<'a>,
        operation_definition: &'a OperationDefinition,
    ) {
        if let OperationDefinition::Query(query) = operation_definition {
            for var in &query.variable_definitions {
                if let Some(ty) = ctx.registry.basic_type_by_parsed_type(&var.var_type) {
                    if ty.name() == "Upload" {
                        ctx.report_error(
                            vec![var.position],
                            "The Upload type is only allowed to be defined on a mutation",
                        );
                    }
                }
            }
        }
    }
}