Enable Pallet XCM for Kusama & Westend (#2970)

* Enable Pallet XCM for Kusama & Westend

* Fixes

Co-authored-by: André Silva <andrerfosilva@gmail.com>

polkadot/Cargo.lock

@@ -3233,6 +3233,7 @@ dependencies = [
  "pallet-treasury",
  "pallet-utility",
  "pallet-vesting",
+ "pallet-xcm",
  "parity-scale-codec",
  "polkadot-primitives",
  "polkadot-runtime-common",
@@ -11309,6 +11310,7 @@ dependencies = [
  "pallet-treasury",
  "pallet-utility",
  "pallet-vesting",
+ "pallet-xcm",
  "parity-scale-codec",
  "polkadot-parachain",
  "polkadot-primitives",

polkadot/runtime/kusama/Cargo.toml

@@ -69,6 +69,7 @@ pallet-tips = { git = "https://github.com/paritytech/substrate", branch = "maste
 pallet-treasury = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 pallet-utility = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 pallet-vesting = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
+pallet-xcm = { path = "../../xcm/pallet-xcm", default-features = false }
 
 frame-benchmarking = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
 frame-try-runtime = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
@@ -148,6 +149,7 @@ std = [
 	"pallet-vesting/std",
 	"pallet-babe/std",
 	"pallet-randomness-collective-flip/std",
+	"pallet-xcm/std",
 	"sp-runtime/std",
 	"sp-staking/std",
 	"frame-system/std",
@@ -198,6 +200,7 @@ runtime-benchmarks = [
 	"pallet-vesting/runtime-benchmarks",
 	"pallet-offences-benchmarking",
 	"pallet-session-benchmarking",
+	"pallet-xcm/runtime-benchmarks",
 	"frame-system-benchmarking",
 	"hex-literal",
 	"xcm-builder/runtime-benchmarks",

polkadot/runtime/kusama/src/lib.rs

@@ -52,12 +52,12 @@ use runtime_parachains::scheduler as parachains_scheduler;
 use runtime_parachains::reward_points as parachains_reward_points;
 use runtime_parachains::runtime_api_impl::v1 as parachains_runtime_api_impl;
 
-use xcm::v0::{MultiLocation, NetworkId};
+use xcm::v0::{MultiLocation, NetworkId, BodyId, Xcm};
 use xcm_builder::{
 	AccountId32Aliases, ChildParachainConvertsVia, SovereignSignedViaLocation, CurrencyAdapter as XcmCurrencyAdapter,
-	ChildParachainAsNative, SignedAccountId32AsNative, ChildSystemParachainAsSuperuser, LocationInverter, IsConcrete,
+	ChildParachainAsNative, SignedAccountId32AsNative, ChildSystemParachainAsSuperuser, LocationInverter,
-	FixedWeightBounds, TakeWeightCredit, AllowTopLevelPaidExecutionFrom,
+	IsConcrete, FixedWeightBounds, TakeWeightCredit, AllowTopLevelPaidExecutionFrom, AllowUnpaidExecutionFrom,
-	AllowUnpaidExecutionFrom, IsChildSystemParachain, UsingComponents,
+	IsChildSystemParachain, UsingComponents, BackingToPlurality, SignedToAccountId32
 };
 use xcm_executor::XcmExecutor;
 use sp_runtime::{
@@ -115,7 +115,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	spec_name: create_runtime_str!("kusama"),
 	impl_name: create_runtime_str!("parity-kusama"),
 	authoring_version: 2,
-	spec_version: 900,
+	spec_version: 9000,
 	impl_version: 0,
 	#[cfg(not(feature = "disable-runtime-api"))]
 	apis: RUNTIME_API_VERSIONS,
@@ -1146,6 +1146,79 @@ impl xcm_executor::Config for XcmConfig {
 	type ResponseHandler = ();
 }
 
+parameter_types! {
+	pub const CouncilBodyId: BodyId = BodyId::Executive;
+}
+
+/// Type to convert an `Origin` type value into a `MultiLocation` value which represents an interior location
+/// of this chain.
+pub type LocalOriginToLocation = (
+	// We allow an origin from the Collective pallet to be used in XCM as a corresponding Plurality of the
+	// `Unit` body.
+	BackingToPlurality<Origin, pallet_collective::Origin<Runtime, CouncilCollective>, CouncilBodyId>,
+	// And a usual Signed origin to be used in XCM as a corresponding AccountId32
+	SignedToAccountId32<Origin, AccountId, KusamaNetwork>,
+);
+
+pub struct OnlyWithdrawTeleportForAccounts;
+impl frame_support::traits::Contains<(MultiLocation, Xcm<Call>)> for OnlyWithdrawTeleportForAccounts {
+	fn contains((ref origin, ref msg): &(MultiLocation, Xcm<Call>)) -> bool {
+		use xcm::v0::{
+			Xcm::WithdrawAsset, Order::{BuyExecution, InitiateTeleport, DepositAsset},
+			MultiAsset::{All, ConcreteFungible}, Junction::{AccountId32, Plurality, Parachain},
+			MultiLocation::{Null, X1},
+		};
+		match origin {
+			// Root and council are are allowed to execute anything.
+			Null | X1(Plurality { .. }) => true,
+			X1(AccountId32 { .. }) => {
+				// An account ID trying to send a message. We ensure that it's sensible.
+				// This checks that it's of the form:
+				// WithdrawAsset {
+				//   assets: [ ConcreteFungible { id: Null } ],
+				//   effects: [ BuyExecution, InitiateTeleport {
+				//     assets: All,
+				//     dest: Parachain,
+				//     effects: [ BuyExecution, DepositAssets {
+				//       assets: All,
+				//       dest: AccountId32,
+				//     } ]
+				//   } ]
+				// }
+				matches!(msg, WithdrawAsset { ref assets, ref effects }
+					if assets.len() == 1
+					&& matches!(assets[0], ConcreteFungible { id: Null, .. })
+					&& effects.len() == 2
+					&& matches!(effects[0], BuyExecution { .. })
+					&& matches!(effects[1], InitiateTeleport { ref assets, dest: X1(Parachain(..)), ref effects }
+						if assets.len() == 1
+						&& matches!(assets[0], All)
+						&& effects.len() == 2
+						&& matches!(effects[0], BuyExecution { .. })
+						&& matches!(effects[1], DepositAsset { ref assets, dest: X1(AccountId32{..}) }
+							if assets.len() == 1
+							&& matches!(assets[0], All)
+						)
+					)
+				)
+			}
+			// Nobody else is allowed to execute anything.
+			_ => false,
+		}
+	}
+}
+
+impl pallet_xcm::Config for Runtime {
+	type Event = Event;
+	type SendXcmOrigin = xcm_builder::EnsureXcmOrigin<Origin, LocalOriginToLocation>;
+	type XcmRouter = XcmRouter;
+	// Anyone can execute XCM messages locally...
+	type ExecuteXcmOrigin = xcm_builder::EnsureXcmOrigin<Origin, LocalOriginToLocation>;
+	// ...but they must match our filter, which requires them to be a simple withdraw + teleport.
+	type XcmExecuteFilter = OnlyWithdrawTeleportForAccounts;
+	type XcmExecutor = XcmExecutor<XcmConfig>;
+}
+
 construct_runtime! {
 	pub enum Runtime where
 		Block = Block,
@@ -1235,6 +1308,9 @@ construct_runtime! {
 		// Parachain Onboarding Pallets. Start indices at 70 to leave room.
 		Registrar: paras_registrar::{Pallet, Call, Storage, Event<T>} = 70,
 		Slots: slots::{Pallet, Call, Storage, Event<T>} = 71,
+
+		// Pallet for sending XCM.
+		XcmPallet: pallet_xcm::{Pallet, Call, Storage, Event<T>} = 99,
 	}
 }
 

polkadot/runtime/polkadot/src/lib.rs

@@ -95,7 +95,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	spec_name: create_runtime_str!("polkadot"),
 	impl_name: create_runtime_str!("parity-polkadot"),
 	authoring_version: 0,
-	spec_version: 900,
+	spec_version: 9000,
 	impl_version: 0,
 	#[cfg(not(feature = "disable-runtime-api"))]
 	apis: RUNTIME_API_VERSIONS,

polkadot/runtime/rococo/src/lib.rs

@@ -110,7 +110,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	spec_name: create_runtime_str!("rococo"),
 	impl_name: create_runtime_str!("parity-rococo-v1.5"),
 	authoring_version: 0,
-	spec_version: 232,
+	spec_version: 9000,
 	impl_version: 0,
 	#[cfg(not(feature = "disable-runtime-api"))]
 	apis: RUNTIME_API_VERSIONS,
@@ -664,11 +664,11 @@ impl frame_support::traits::Contains<(MultiLocation, Xcm<Call>)> for OnlyWithdra
 	fn contains((ref origin, ref msg): &(MultiLocation, Xcm<Call>)) -> bool {
 		use xcm::v0::{
 			Xcm::WithdrawAsset, Order::{BuyExecution, InitiateTeleport, DepositAsset},
-			MultiAsset::{All, ConcreteFungible}, Junction::AccountId32,
+			MultiAsset::{All, ConcreteFungible}, Junction::{AccountId32, Plurality},
 		};
 		match origin {
-			// Root is allowed to execute anything.
+			// Root and collective are allowed to execute anything.
-			Null => true,
+			Null | X1(Plurality { .. }) => true,
 			X1(AccountId32 { .. }) => {
 				// An account ID trying to send a message. We ensure that it's sensible.
 				// This checks that it's of the form:

polkadot/runtime/westend/Cargo.toml

@@ -68,6 +68,7 @@ pallet-transaction-payment-rpc-runtime-api = { git = "https://github.com/parityt
 pallet-treasury = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 pallet-utility = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 pallet-vesting = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
+pallet-xcm = { path = "../../xcm/pallet-xcm", default-features = false }
 
 frame-benchmarking = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
 frame-try-runtime = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
@@ -146,6 +147,7 @@ std = [
 	"pallet-treasury/std",
 	"pallet-utility/std",
 	"pallet-vesting/std",
+	"pallet-xcm/std",
 	"pallet-babe/std",
 	"pallet-randomness-collective-flip/std",
 	"frame-executive/std",
@@ -194,6 +196,7 @@ runtime-benchmarks = [
 	"pallet-vesting/runtime-benchmarks",
 	"pallet-offences-benchmarking",
 	"pallet-session-benchmarking",
+	"pallet-xcm/runtime-benchmarks",
 	"frame-system-benchmarking",
 	"hex-literal",
 	"xcm-builder/runtime-benchmarks",

polkadot/runtime/westend/src/lib.rs

@@ -53,13 +53,13 @@ use runtime_parachains::scheduler as parachains_scheduler;
 use runtime_parachains::reward_points as parachains_reward_points;
 use runtime_parachains::runtime_api_impl::v1 as parachains_runtime_api_impl;
 
-use xcm::v0::{MultiLocation, NetworkId};
+use xcm::v0::{MultiLocation, NetworkId, Xcm};
 use xcm_executor::XcmExecutor;
 use xcm_builder::{
 	AccountId32Aliases, ChildParachainConvertsVia, SovereignSignedViaLocation, CurrencyAdapter as XcmCurrencyAdapter,
 	ChildParachainAsNative, SignedAccountId32AsNative, ChildSystemParachainAsSuperuser, LocationInverter, IsConcrete,
-	FixedWeightBounds, TakeWeightCredit, AllowTopLevelPaidExecutionFrom,
+	FixedWeightBounds, TakeWeightCredit, AllowTopLevelPaidExecutionFrom, AllowUnpaidExecutionFrom,
-	AllowUnpaidExecutionFrom, IsChildSystemParachain, UsingComponents,
+	IsChildSystemParachain, UsingComponents, SignedToAccountId32,
 };
 
 use sp_runtime::{
@@ -115,7 +115,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	spec_name: create_runtime_str!("westend"),
 	impl_name: create_runtime_str!("parity-westend"),
 	authoring_version: 2,
-	spec_version: 900,
+	spec_version: 9000,
 	impl_version: 0,
 	#[cfg(not(feature = "disable-runtime-api"))]
 	apis: RUNTIME_API_VERSIONS,
@@ -858,6 +858,72 @@ impl xcm_executor::Config for XcmConfig {
 	type ResponseHandler = ();
 }
 
+/// Type to convert an `Origin` type value into a `MultiLocation` value which represents an interior location
+/// of this chain.
+pub type LocalOriginToLocation = (
+	// And a usual Signed origin to be used in XCM as a corresponding AccountId32
+	SignedToAccountId32<Origin, AccountId, WestendNetwork>,
+);
+
+pub struct OnlyWithdrawTeleportForAccounts;
+impl frame_support::traits::Contains<(MultiLocation, Xcm<Call>)> for OnlyWithdrawTeleportForAccounts {
+	fn contains((ref origin, ref msg): &(MultiLocation, Xcm<Call>)) -> bool {
+		use xcm::v0::{
+			Xcm::WithdrawAsset, Order::{BuyExecution, InitiateTeleport, DepositAsset},
+			MultiAsset::{All, ConcreteFungible}, Junction::{AccountId32, Parachain},
+			MultiLocation::{Null, X1},
+		};
+		match origin {
+			// Root is allowed to execute anything.
+			Null => true,
+			X1(AccountId32 { .. }) => {
+				// An account ID trying to send a message. We ensure that it's sensible.
+				// This checks that it's of the form:
+				// WithdrawAsset {
+				//   assets: [ ConcreteFungible { id: Null } ],
+				//   effects: [ BuyExecution, InitiateTeleport {
+				//     assets: All,
+				//     dest: Parachain,
+				//     effects: [ BuyExecution, DepositAssets {
+				//       assets: All,
+				//       dest: AccountId32,
+				//     } ]
+				//   } ]
+				// }
+				matches!(msg, WithdrawAsset { ref assets, ref effects }
+					if assets.len() == 1
+					&& matches!(assets[0], ConcreteFungible { id: Null, .. })
+					&& effects.len() == 2
+					&& matches!(effects[0], BuyExecution { .. })
+					&& matches!(effects[1], InitiateTeleport { ref assets, dest: X1(Parachain(..)), ref effects }
+						if assets.len() == 1
+						&& matches!(assets[0], All)
+						&& effects.len() == 2
+						&& matches!(effects[0], BuyExecution { .. })
+						&& matches!(effects[1], DepositAsset { ref assets, dest: X1(AccountId32{..}) }
+							if assets.len() == 1
+							&& matches!(assets[0], All)
+						)
+					)
+				)
+			}
+			// Nobody else is allowed to execute anything.
+			_ => false,
+		}
+	}
+}
+
+impl pallet_xcm::Config for Runtime {
+	type Event = Event;
+	type SendXcmOrigin = xcm_builder::EnsureXcmOrigin<Origin, LocalOriginToLocation>;
+	type XcmRouter = XcmRouter;
+	// Anyone can execute XCM messages locally...
+	type ExecuteXcmOrigin = xcm_builder::EnsureXcmOrigin<Origin, LocalOriginToLocation>;
+	// ...but they must match our filter, which requires them to be a simple withdraw + teleport.
+	type XcmExecuteFilter = OnlyWithdrawTeleportForAccounts;
+	type XcmExecutor = XcmExecutor<XcmConfig>;
+}
+
 construct_runtime! {
 	pub enum Runtime where
 		Block = Block,
@@ -931,6 +997,9 @@ construct_runtime! {
 		Registrar: paras_registrar::{Pallet, Call, Storage, Event<T>} = 60,
 		Slots: slots::{Pallet, Call, Storage, Event<T>} = 61,
 		ParasSudoWrapper: paras_sudo_wrapper::{Pallet, Call} = 62,
+
+		// Pallet for sending XCM.
+		XcmPallet: pallet_xcm::{Pallet, Call, Storage, Event<T>} = 99,
 	}
 }