precompile_utils/solidity/
modifier.rs

1// This file is part of Frontier.
2
3// Copyright (c) Moonsong Labs.
4// Copyright (C) Parity Technologies (UK) Ltd.
5// SPDX-License-Identifier: Apache-2.0
6
7// Licensed under the Apache License, Version 2.0 (the "License");
8// you may not use this file except in compliance with the License.
9// You may obtain a copy of the License at
10//
11// 	http://www.apache.org/licenses/LICENSE-2.0
12//
13// Unless required by applicable law or agreed to in writing, software
14// distributed under the License is distributed on an "AS IS" BASIS,
15// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16// See the License for the specific language governing permissions and
17// limitations under the License.
18
19//! Provide checks related to function modifiers (view/payable).
20
21use crate::solidity::revert::{MayRevert, RevertReason};
22use fp_evm::Context;
23use sp_core::U256;
24
25/// Represents modifiers a Solidity function can be annotated with.
26#[derive(Copy, Clone, PartialEq, Eq)]
27pub enum FunctionModifier {
28	/// Function that doesn't modify the state.
29	View,
30	/// Function that modifies the state but refuse receiving funds.
31	/// Correspond to a Solidity function with no modifiers.
32	NonPayable,
33	/// Function that modifies the state and accept funds.
34	Payable,
35}
36
37/// Check that a function call is compatible with the context it is
38/// called into.
39pub fn check_function_modifier(
40	context: &Context,
41	is_static: bool,
42	modifier: FunctionModifier,
43) -> MayRevert {
44	if is_static && modifier != FunctionModifier::View {
45		return Err(
46			RevertReason::custom("Can't call non-static function in static context").into(),
47		);
48	}
49
50	if modifier != FunctionModifier::Payable && context.apparent_value > U256::zero() {
51		return Err(RevertReason::custom("Function is not payable").into());
52	}
53
54	Ok(())
55}
precompile_utils/solidity/modifier.rs

precompile_utils/solidity/
modifier.rs
