moonriver_runtime/
asset_config.rs

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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/>.

//! Asset configuration for Moonbase.
//!

use super::{AccountId, AssetId, Runtime, FOREIGN_ASSET_PRECOMPILE_ADDRESS_PREFIX};

use moonkit_xcm_primitives::AccountIdAssetIdConversion;

use sp_core::H160;

use sp_std::{
	convert::{From, Into},
	prelude::*,
};

// Instruct how to go from an H160 to an AssetID
// We just take the lowest 128 bits
impl AccountIdAssetIdConversion<AccountId, AssetId> for Runtime {
	/// The way to convert an account to assetId is by ensuring that the prefix is 0XFFFFFFFF
	/// and by taking the lowest 128 bits as the assetId
	fn account_to_asset_id(account: AccountId) -> Option<(Vec<u8>, AssetId)> {
		let h160_account: H160 = account.into();
		let mut data = [0u8; 16];
		let (prefix_part, id_part) = h160_account.as_fixed_bytes().split_at(4);
		if prefix_part == FOREIGN_ASSET_PRECOMPILE_ADDRESS_PREFIX {
			data.copy_from_slice(id_part);
			let asset_id: AssetId = u128::from_be_bytes(data).into();
			Some((prefix_part.to_vec(), asset_id))
		} else {
			None
		}
	}

	// The opposite conversion
	fn asset_id_to_account(prefix: &[u8], asset_id: AssetId) -> AccountId {
		let mut data = [0u8; 20];
		data[0..4].copy_from_slice(prefix);
		data[4..20].copy_from_slice(&asset_id.to_be_bytes());
		AccountId::from(data)
	}
}