XCM: Land XCM Builder (#1793)

* Land XCM Builder * Clean up Cargo dependencies Co-authored-by: Gavin Wood <gavin@parity.io>
2026-06-01 04:31:02 +00:00 · 2020-10-07 18:32:53 +02:00
parent 2b798f8571
commit fc1153681e
9 changed files with 588 additions and 134 deletions
@@ -0,0 +1,126 @@
+// Copyright 2020 Parity Technologies (UK) Ltd.
+// This file is part of Polkadot.
+
+// Polkadot 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.
+
+// Polkadot 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 Polkadot.  If not, see <http://www.gnu.org/licenses/>.
+
+use sp_std::marker::PhantomData;
+use sp_io::hashing::blake2_256;
+use sp_runtime::traits::AccountIdConversion;
+use frame_support::traits::Get;
+use codec::Encode;
+use xcm::v0::{MultiLocation, NetworkId, Junction};
+use xcm_executor::traits::LocationConversion;
+
+pub struct Account32Hash<Network, AccountId>(PhantomData<(Network, AccountId)>);
+
+impl<
+	Network: Get<NetworkId>,
+	AccountId: From<[u8; 32]> + Into<[u8; 32]>,
+> LocationConversion<AccountId> for Account32Hash<Network, AccountId> {
+	fn from_location(location: &MultiLocation) -> Option<AccountId> {
+		Some(("multiloc", location).using_encoded(blake2_256).into())
+	}
+
+	fn try_into_location(who: AccountId) -> Result<MultiLocation, AccountId> {
+		Err(who)
+	}
+}
+
+pub struct ParentIsDefault<AccountId>(PhantomData<AccountId>);
+
+impl<
+	AccountId: Default + Eq,
+> LocationConversion<AccountId> for ParentIsDefault<AccountId> {
+	fn from_location(location: &MultiLocation) -> Option<AccountId> {
+		if let MultiLocation::X1(Junction::Parent) = location {
+			Some(AccountId::default())
+		} else {
+			None
+		}
+	}
+
+	fn try_into_location(who: AccountId) -> Result<MultiLocation, AccountId> {
+		if who == AccountId::default() {
+			Ok(Junction::Parent.into())
+		} else {
+			Err(who)
+		}
+	}
+}
+
+pub struct ChildParachainConvertsVia<ParaId, AccountId>(PhantomData<(ParaId, AccountId)>);
+
+impl<
+	ParaId: From<u32> + Into<u32> + AccountIdConversion<AccountId>,
+	AccountId,
+> LocationConversion<AccountId> for ChildParachainConvertsVia<ParaId, AccountId> {
+	fn from_location(location: &MultiLocation) -> Option<AccountId> {
+		if let MultiLocation::X1(Junction::Parachain { id }) = location {
+			Some(ParaId::from(*id).into_account())
+		} else {
+			None
+		}
+	}
+
+	fn try_into_location(who: AccountId) -> Result<MultiLocation, AccountId> {
+		if let Some(id) = ParaId::try_from_account(&who) {
+			Ok(Junction::Parachain { id: id.into() }.into())
+		} else {
+			Err(who)
+		}
+	}
+}
+
+pub struct SiblingParachainConvertsVia<ParaId, AccountId>(PhantomData<(ParaId, AccountId)>);
+
+impl<
+	ParaId: From<u32> + Into<u32> + AccountIdConversion<AccountId>,
+	AccountId,
+> LocationConversion<AccountId> for SiblingParachainConvertsVia<ParaId, AccountId> {
+	fn from_location(location: &MultiLocation) -> Option<AccountId> {
+		if let MultiLocation::X2(Junction::Parent, Junction::Parachain { id }) = location {
+			Some(ParaId::from(*id).into_account())
+		} else {
+			None
+		}
+	}
+
+	fn try_into_location(who: AccountId) -> Result<MultiLocation, AccountId> {
+		if let Some(id) = ParaId::try_from_account(&who) {
+			Ok([Junction::Parent, Junction::Parachain { id: id.into() }].into())
+		} else {
+			Err(who)
+		}
+	}
+}
+
+pub struct AccountId32Aliases<Network, AccountId>(PhantomData<(Network, AccountId)>);
+
+impl<
+	Network: Get<NetworkId>,
+	AccountId: From<[u8; 32]> + Into<[u8; 32]>,
+> LocationConversion<AccountId> for AccountId32Aliases<Network, AccountId> {
+	fn from_location(location: &MultiLocation) -> Option<AccountId> {
+		if let MultiLocation::X1(Junction::AccountId32 { id, network }) = location {
+			if matches!(network, NetworkId::Any) || network == &Network::get() {
+				return Some((*id).into())
+			}
+		}
+		None
+	}
+
+	fn try_into_location(who: AccountId) -> Result<MultiLocation, AccountId> {
+		Ok(Junction::AccountId32 { id: who.into(), network: Network::get() }.into())
+	}
+}