async-graphql 7.2.1

A GraphQL server library implemented in Rust
Documentation 
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use crate::{
    Name, Positioned,
    parser::types::{OperationDefinition, OperationType},
    validation::visitor::{Visitor, VisitorContext},
};

#[derive(Default)]
pub struct UploadFile;

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