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// Copyright 2019-2025 PureStake Inc.
// This file is part of Moonbeam.
// Moonbeam is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Moonbeam is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Moonbeam. If not, see <http://www.gnu.org/licenses/>.
//! Precompile to interact with pallet author mapping through an evm precompile.
#![cfg_attr(not(feature = "std"), no_std)]
use fp_evm::PrecompileHandle;
use frame_support::{
dispatch::{GetDispatchInfo, PostDispatchInfo},
traits::Get,
};
use nimbus_primitives::NimbusId;
use pallet_author_mapping::Call as AuthorMappingCall;
use pallet_evm::AddressMapping;
use parity_scale_codec::Encode;
use precompile_utils::prelude::*;
use sp_core::crypto::UncheckedFrom;
use sp_core::{H160, H256};
use sp_runtime::traits::Dispatchable;
use sp_std::marker::PhantomData;
#[cfg(test)]
mod mock;
mod tests;
/// A precompile to wrap the functionality from pallet author mapping.
pub struct AuthorMappingPrecompile<Runtime>(PhantomData<Runtime>);
/// Bound for the keys size.
/// Pallet will check that the size exactly matches, but we want to bound the parser to
/// not accept larger bytes.
pub struct GetKeysSize<R>(PhantomData<R>);
impl<R: pallet_author_mapping::Config> Get<u32> for GetKeysSize<R> {
fn get() -> u32 {
pallet_author_mapping::pallet::keys_size::<R>()
.try_into()
.expect("keys size to fit in u32")
}
#[precompile_utils::precompile]
#[precompile::test_concrete_types(mock::Runtime)]
impl<Runtime> AuthorMappingPrecompile<Runtime>
where
Runtime: pallet_author_mapping::Config + pallet_evm::Config + frame_system::Config,
Runtime::RuntimeCall: Dispatchable<PostInfo = PostDispatchInfo> + GetDispatchInfo,
Runtime::RuntimeCall: From<AuthorMappingCall<Runtime>>,
Runtime::Hash: From<H256>,
Runtime::AccountId: Into<H160>,
<Runtime as pallet_evm::Config>::AddressMapping: AddressMapping<Runtime::AccountId>,
{
// The dispatchable wrappers are next. They dispatch a Substrate inner Call.
#[precompile::public("addAssociation(bytes32)")]
#[precompile::public("add_association(bytes32)")]
fn add_association(handle: &mut impl PrecompileHandle, nimbus_id: H256) -> EvmResult {
let nimbus_id = sp_core::sr25519::Public::unchecked_from(nimbus_id).into();
log::trace!(
target: "author-mapping-precompile",
"Associating author id {:?}", nimbus_id
);
let origin = Runtime::AddressMapping::into_account_id(handle.context().caller);
let call = AuthorMappingCall::<Runtime>::add_association { nimbus_id };
RuntimeHelper::<Runtime>::try_dispatch(
handle,
frame_system::RawOrigin::Signed(origin).into(),
call,
0,
)?;
Ok(())
#[precompile::public("updateAssociation(bytes32,bytes32)")]
#[precompile::public("update_association(bytes32,bytes32)")]
fn update_association(
handle: &mut impl PrecompileHandle,
old_nimbus_id: H256,
new_nimbus_id: H256,
) -> EvmResult {
let old_nimbus_id = sp_core::sr25519::Public::unchecked_from(old_nimbus_id).into();
let new_nimbus_id = sp_core::sr25519::Public::unchecked_from(new_nimbus_id).into();
"Updating author id {:?} for {:?}", old_nimbus_id, new_nimbus_id
let call = AuthorMappingCall::<Runtime>::update_association {
old_nimbus_id,
new_nimbus_id,
#[precompile::public("clearAssociation(bytes32)")]
#[precompile::public("clear_association(bytes32)")]
fn clear_association(handle: &mut impl PrecompileHandle, nimbus_id: H256) -> EvmResult {
"Clearing author id {:?}", nimbus_id
let call = AuthorMappingCall::<Runtime>::clear_association { nimbus_id };
#[precompile::public("removeKeys()")]
#[precompile::public("remove_keys()")]
fn remove_keys(handle: &mut impl PrecompileHandle) -> EvmResult {
"Removing keys"
let call = AuthorMappingCall::<Runtime>::remove_keys {};
#[precompile::public("setKeys(bytes)")]
#[precompile::public("set_keys(bytes)")]
fn set_keys(
keys: BoundedBytes<GetKeysSize<Runtime>>,
let call = AuthorMappingCall::<Runtime>::set_keys { keys: keys.into() };
#[precompile::public("nimbusIdOf(address)")]
#[precompile::view]
fn nimbus_id_of(handle: &mut impl PrecompileHandle, address: Address) -> EvmResult<H256> {
// Storage item: NimbusLookup:
// Blake2_128(16) + AccountId(20) + NimbusId(32)
handle.record_db_read::<Runtime>(68)?;
let account = Runtime::AddressMapping::into_account_id(address.0);
let nimbus_id = pallet_author_mapping::Pallet::<Runtime>::nimbus_id_of(&account)
.map(|x| H256::from(sp_core::sr25519::Public::from(x).0))
.unwrap_or(H256::zero());
Ok(nimbus_id)
#[precompile::public("addressOf(bytes32)")]
fn address_of(handle: &mut impl PrecompileHandle, nimbus_id: H256) -> EvmResult<Address> {
// Storage item: MappingWithDeposit:
// Blake2_128(16) + NimbusId(32) + RegistrationInfo(20 + 16 + VrfId(32))
handle.record_db_read::<Runtime>(116)?;
let nimbus_id = sp_core::sr25519::Public::unchecked_from(nimbus_id);
let nimbus_id: NimbusId = nimbus_id.into();
let address: H160 = pallet_author_mapping::Pallet::<Runtime>::account_id_of(&nimbus_id)
.map(|x| x.into())
.unwrap_or(H160::zero());
Ok(Address(address))
#[precompile::public("keysOf(bytes32)")]
fn keys_of(handle: &mut impl PrecompileHandle, nimbus_id: H256) -> EvmResult<UnboundedBytes> {
let keys = pallet_author_mapping::Pallet::<Runtime>::keys_of(&nimbus_id)
.map(|x| x.encode())
.unwrap_or_default();
Ok(keys.into())