`c396bdd22f0e`

source

pallets/evm-contract-helpers/src/eth.rs6.5 KiBsource history
1// Copyright 2019-2022 Unique Network (Gibraltar) Ltd.2// This file is part of Unique Network.34// Unique Network is free software: you can redistribute it and/or modify5// it under the terms of the GNU General Public License as published by6// the Free Software Foundation, either version 3 of the License, or7// (at your option) any later version.89// Unique Network is distributed in the hope that it will be useful,10// but WITHOUT ANY WARRANTY; without even the implied warranty of11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the12// GNU General Public License for more details.1314// You should have received a copy of the GNU General Public License15// along with Unique Network. If not, see <http://www.gnu.org/licenses/>.1617use core::marker::PhantomData;18use evm_coder::{19	abi::AbiWriter,20	execution::{Result, Error},21	generate_stubgen, solidity_interface,22	types::*,23};24use pallet_evm_coder_substrate::{SubstrateRecorder, WithRecorder, dispatch_to_evm};25use pallet_evm::{26	ExitRevert, OnCreate, OnMethodCall, PrecompileResult, PrecompileFailure, PrecompileHandle,27	account::CrossAccountId,28};29use sp_core::H160;30use crate::{31	AllowlistEnabled, Config, Owner, Pallet, SponsorBasket, SponsoringRateLimit, SponsoringModeT,32};33use frame_support::traits::Get;34use up_sponsorship::SponsorshipHandler;35use sp_std::vec::Vec;3637struct ContractHelpers<T: Config>(SubstrateRecorder<T>);38impl<T: Config> WithRecorder<T> for ContractHelpers<T> {39	fn recorder(&self) -> &SubstrateRecorder<T> {40		&self.041	}4243	fn into_recorder(self) -> SubstrateRecorder<T> {44		self.045	}46}4748#[solidity_interface(name = "ContractHelpers")]49impl<T: Config> ContractHelpers<T> {50	fn contract_owner(&self, contract_address: address) -> Result<address> {51		Ok(<Pallet<T>>::contract_owner(contract_address)52			.map_err(dispatch_to_evm::<T>)?53			.as_eth()54			.clone())55	}5657	fn sponsoring_enabled(&self, contract_address: address) -> Result<bool> {58		Ok(<Pallet<T>>::sponsoring_mode(contract_address) != SponsoringModeT::Disabled)59	}6061	/// Deprecated62	fn toggle_sponsoring(63		&mut self,64		caller: caller,65		contract_address: address,66		enabled: bool,67	) -> Result<void> {68		<Pallet<T>>::ensure_owner(contract_address, caller)?;69		<Pallet<T>>::toggle_sponsoring(contract_address, enabled);70		Ok(())71	}7273	fn set_sponsoring_mode(74		&mut self,75		caller: caller,76		contract_address: address,77		mode: uint8,78	) -> Result<void> {79		<Pallet<T>>::ensure_owner(contract_address, caller)?;80		let mode = SponsoringModeT::from_eth(mode).ok_or("unknown mode")?;81		<Pallet<T>>::set_sponsoring_mode(contract_address, mode);82		Ok(())83	}8485	fn sponsoring_mode(&self, contract_address: address) -> Result<uint8> {86		Ok(<Pallet<T>>::sponsoring_mode(contract_address).to_eth())87	}8889	fn set_sponsoring_rate_limit(90		&mut self,91		caller: caller,92		contract_address: address,93		rate_limit: uint32,94	) -> Result<void> {95		<Pallet<T>>::ensure_owner(contract_address, caller)?;96		<Pallet<T>>::set_sponsoring_rate_limit(contract_address, rate_limit.into());97		Ok(())98	}99100	fn get_sponsoring_rate_limit(&self, contract_address: address) -> Result<uint32> {101		Ok(<SponsoringRateLimit<T>>::get(contract_address)102			.try_into()103			.map_err(|_| "rate limit > u32::MAX")?)104	}105106	fn allowed(&self, contract_address: address, user: address) -> Result<bool> {107		self.0.consume_sload()?;108		Ok(<Pallet<T>>::allowed(contract_address, T::CrossAccountId::from_eth(user)))109	}110111	fn allowlist_enabled(&self, contract_address: address) -> Result<bool> {112		Ok(<AllowlistEnabled<T>>::get(contract_address))113	}114115	fn toggle_allowlist(116		&mut self,117		caller: caller,118		contract_address: address,119		enabled: bool,120	) -> Result<void> {121		<Pallet<T>>::ensure_owner(contract_address, caller)?;122		<Pallet<T>>::toggle_allowlist(contract_address, enabled);123		Ok(())124	}125126	fn toggle_allowed(127		&mut self,128		caller: caller,129		contract_address: address,130		user: address,131		allowed: bool,132	) -> Result<void> {133		<Pallet<T>>::ensure_owner(contract_address, caller)?;134		<Pallet<T>>::toggle_allowed(contract_address, user, allowed);135		Ok(())136	}137}138139pub struct HelpersOnMethodCall<T: Config>(PhantomData<*const T>);140impl<T: Config> OnMethodCall<T> for HelpersOnMethodCall<T> {141	fn is_reserved(contract: &sp_core::H160) -> bool {142		contract == &T::ContractAddress::get()143	}144145	fn is_used(contract: &sp_core::H160) -> bool {146		contract == &T::ContractAddress::get()147	}148149	fn call(handle: &mut impl PrecompileHandle) -> Option<PrecompileResult> {150		// TODO: Extract to another OnMethodCall handler151		if <AllowlistEnabled<T>>::get(handle.code_address())152			&& !<Pallet<T>>::allowed(handle.code_address(), T::CrossAccountId::from_eth(handle.context().caller))153		{154			return Some(Err(PrecompileFailure::Revert {155				exit_status: ExitRevert::Reverted,156				output: {157					let mut writer = AbiWriter::new_call(evm_coder::fn_selector!(Error(string)));158					writer.string("Target contract is allowlisted");159					writer.finish()160				},161			}));162		}163164		if handle.code_address() != T::ContractAddress::get() {165			return None;166		}167168		let helpers = ContractHelpers::<T>(SubstrateRecorder::<T>::new(handle.remaining_gas()));169		pallet_evm_coder_substrate::call(handle, helpers)170	}171172	fn get_code(contract: &sp_core::H160) -> Option<Vec<u8>> {173		(contract == &T::ContractAddress::get())174			.then(|| include_bytes!("./stubs/ContractHelpers.raw").to_vec())175	}176}177178pub struct HelpersOnCreate<T: Config>(PhantomData<*const T>);179impl<T: Config> OnCreate<T> for HelpersOnCreate<T> {180	fn on_create(owner: H160, contract: H160) {181		<Owner<T>>::insert(contract, T::CrossAccountId::from_eth(owner));182	}183}184185pub struct HelpersContractSponsoring<T: Config>(PhantomData<*const T>);186impl<T: Config> SponsorshipHandler<T::CrossAccountId, (H160, Vec<u8>)>187	for HelpersContractSponsoring<T>188{189	fn get_sponsor(who: &T::CrossAccountId, call: &(H160, Vec<u8>)) -> Option<T::CrossAccountId> {190		let mode = <Pallet<T>>::sponsoring_mode(call.0);191		if mode == SponsoringModeT::Disabled {192			return None;193		}194195		if mode == SponsoringModeT::Allowlisted && !<Pallet<T>>::allowed(call.0, who.clone()) {196			return None;197		}198		let block_number = <frame_system::Pallet<T>>::block_number() as T::BlockNumber;199200		if let Some(last_tx_block) = <SponsorBasket<T>>::get(&call.0, who.as_eth()) {201			let limit = <SponsoringRateLimit<T>>::get(&call.0);202203			let timeout = last_tx_block + limit;204			if block_number < timeout {205				return None;206			}207		}208209		<SponsorBasket<T>>::insert(&call.0, who.as_eth(), block_number);210211		let sponsor = T::CrossAccountId::from_eth(call.0);212		Some(sponsor)213	}214}215216generate_stubgen!(contract_helpers_impl, ContractHelpersCall<()>, true);217generate_stubgen!(contract_helpers_iface, ContractHelpersCall<()>, false);