feat: support construction of teleports for parachains' primary nativ…

…e assets to AssetHub (#267)

examples/paraToSystemParachainPrimaryNative.ts

@@ -0,0 +1,58 @@
+/**
+ * When importing from @substrate/asset-transfer-api it would look like the following
+ *
+ * import { AssetsTransferApi, constructApiPromise } from '@substrate/asset-transfer-api'
+ */
+import { AssetsTransferApi, constructApiPromise } from '../src';
+import { TxResult } from '../src/types';
+import { GREEN, PURPLE, RESET } from './colors';
+
+/**
+ * In this example we are creating a call to send MOVR from a Moonriver (Parachain) account
+ * to a Kusama Asset Hub (System Parachain) account, where the `xcmVersion` is set to 3, and `isLimited` is false declaring that
+ * it will allow `unlimited` weight for the tx.
+ *
+ * NOTE: When `isLimited` is true it will expect for refTime and proofSize to be provided as additional arguments.
+ */
+const main = async () => {
+	const { api, specName, safeXcmVersion } = await constructApiPromise(
+		'wss://moonriver.api.onfinality.io/public-ws'
+	);
+	const assetApi = new AssetsTransferApi(api, specName, safeXcmVersion);
+	let callInfo: TxResult<'call'>;
+	try {
+		callInfo = await assetApi.createTransferTransaction(
+			'1000',
+			'0xc4db7bcb733e117c0b34ac96354b10d47e84a006b9e7e66a229d174e8ff2a063',
+			['movr'], // Note: since it is the primary asset of Moonriver that is being sent to AssetHub, it will be a `teleportAssets` call
+			['1000000000000'],
+			{
+				format: 'call',
+				isLimited: false,
+				xcmVersion: 3,
+			}
+		);
+
+		console.log(
+			`${PURPLE}The following call data that is returned:\n${GREEN}${JSON.stringify(
+				callInfo,
+				null,
+				4
+			)}`
+		);
+	} catch (e) {
+		console.error(e);
+		throw Error(e as string);
+	}
+
+	const decoded = assetApi.decodeExtrinsic(callInfo.tx, 'call');
+	console.log(
+		`\n${PURPLE}The following decoded tx:\n${GREEN} ${JSON.stringify(
+			JSON.parse(decoded),
+			null,
+			4
+		)}${RESET}`
+	);
+};
+
+main().finally(() => process.exit());

src/AssetsTransferApi.spec.ts

@@ -202,6 +202,7 @@ describe('AssetTransferAPI', () => {
 					Direction.RelayToSystem,
 					AssetType.Native,
 					false,
+					false,
 					relayAssetsApi.registry
 				);
 
@@ -217,6 +218,7 @@ describe('AssetTransferAPI', () => {
 					Direction.RelayToPara,
 					AssetType.Native,
 					false,
+					false,
 					relayAssetsApi.registry
 				);
 
@@ -232,6 +234,7 @@ describe('AssetTransferAPI', () => {
 					Direction.SystemToRelay,
 					AssetType.Native,
 					false,
+					false,
 					systemAssetsApi.registry
 				);
 
@@ -247,6 +250,7 @@ describe('AssetTransferAPI', () => {
 					Direction.SystemToSystem,
 					AssetType.Native,
 					false,
+					false,
 					systemAssetsApi.registry
 				);
 
@@ -261,6 +265,7 @@ describe('AssetTransferAPI', () => {
 						Direction.SystemToSystem,
 						AssetType.Foreign,
 						true,
+						false,
 						systemAssetsApi.registry
 					);
 
@@ -278,6 +283,7 @@ describe('AssetTransferAPI', () => {
 					Direction.SystemToPara,
 					AssetType.Foreign,
 					true,
+					false,
 					systemAssetsApi.registry
 				);
 
@@ -293,6 +299,7 @@ describe('AssetTransferAPI', () => {
 					Direction.SystemToPara,
 					AssetType.Foreign,
 					true,
+					false,
 					systemAssetsApi.registry
 				);
 
@@ -308,6 +315,7 @@ describe('AssetTransferAPI', () => {
 					Direction.ParaToRelay,
 					AssetType.Foreign,
 					false,
+					false,
 					moonriverAssetsApi.registry
 				);
 
@@ -323,6 +331,21 @@ describe('AssetTransferAPI', () => {
 					Direction.ParaToSystem,
 					AssetType.Foreign,
 					true,
+					false,
+					moonriverAssetsApi.registry
+				);
+
+				expect(assetCallType).toEqual('Teleport');
+			});
+			it('Should correctly return Teleport when sending the parachains native asset', () => {
+				const assetCallType = moonriverAssetsApi['fetchCallType'](
+					'2023',
+					'1000',
+					['movr'],
+					Direction.ParaToSystem,
+					AssetType.Foreign,
+					true,
+					true,
 					moonriverAssetsApi.registry
 				);
 
@@ -336,6 +359,7 @@ describe('AssetTransferAPI', () => {
 					Direction.ParaToSystem,
 					AssetType.Foreign,
 					true,
+					false,
 					moonriverAssetsApi.registry
 				);
 
@@ -351,6 +375,7 @@ describe('AssetTransferAPI', () => {
 					Direction.ParaToPara,
 					AssetType.Foreign,
 					true,
+					false,
 					moonriverAssetsApi.registry
 				);
 

src/AssetsTransferApi.ts

@@ -37,6 +37,7 @@ import {
 import { assetIdsContainRelayAsset } from './createXcmTypes/util/assetIdsContainsRelayAsset';
 import { getAssetId } from './createXcmTypes/util/getAssetId';
 import { getChainIdBySpecName } from './createXcmTypes/util/getChainIdBySpecName';
+import { isParachainPrimaryNativeAsset } from './createXcmTypes/util/isParachainPrimaryNativeAsset';
 import { isSystemChain } from './createXcmTypes/util/isSystemChain';
 import { multiLocationAssetIsParachainsNativeAsset } from './createXcmTypes/util/multiLocationAssetIsParachainsNativeAsset';
 import {
@@ -165,10 +166,17 @@ export class AssetsTransferApi {
 		);
 		const isForeignAssetsTransfer: boolean =
 			this.checkIsForeignAssetTransfer(assetIds);
+		const isPrimaryParachainNativeAsset = isParachainPrimaryNativeAsset(
+			registry,
+			_specName,
+			xcmDirection,
+			assetIds[0]
+		);
 		const xcmPallet = establishXcmPallet(
 			_api,
 			xcmDirection,
-			isForeignAssetsTransfer
+			isForeignAssetsTransfer,
+			isPrimaryParachainNativeAsset
 		);
 
 		/**
@@ -307,6 +315,7 @@ export class AssetsTransferApi {
 			registry,
 			isForeignAssetsTransfer,
 			isLiquidTokenTransfer,
+			isPrimaryParachainNativeAsset,
 			{
 				xcmVersion,
 				paysWithFeeDest,
@@ -326,6 +335,7 @@ export class AssetsTransferApi {
 			xcmDirection,
 			assetType,
 			isForeignAssetsTransfer,
+			isPrimaryParachainNativeAsset,
 			registry
 		);
 
@@ -715,6 +725,7 @@ export class AssetsTransferApi {
 		xcmDirection: Direction,
 		assetType: AssetType,
 		isForeignAssetsTransfer: boolean,
+		isParachainPrimaryNativeAsset: boolean,
 		registry: Registry
 	): AssetCallType {
 		// relay to system -> teleport
@@ -808,9 +819,10 @@ export class AssetsTransferApi {
 
 		// para to system only when the assets are native to origin -> teleport
 		if (
-			xcmDirection === Direction.ParaToSystem &&
-			!assetIdsContainRelayAsset(assetIds, registry) &&
-			originIsMultiLocationsNativeChain
+			(xcmDirection === Direction.ParaToSystem &&
+				!assetIdsContainRelayAsset(assetIds, registry) &&
+				originIsMultiLocationsNativeChain) ||
+			isParachainPrimaryNativeAsset
 		) {
 			return AssetCallType.Teleport;
 		}

src/createXcmCalls/util/establishXcmPallet.ts

@@ -21,7 +21,8 @@ export enum XcmPalletName {
 export const establishXcmPallet = (
 	api: ApiPromise,
 	direction?: Direction,
-	isForeignAssetsTransfer?: boolean
+	isForeignAssetsTransfer?: boolean,
+	isParachainPrimaryNativeAsset?: boolean
 ): XcmPalletName => {
 	// checks for the existence of the xTokens pallet
 	// for direction ParaToSystem, if it exists and the tx is
@@ -30,7 +31,8 @@ export const establishXcmPallet = (
 		isXTokensParaToSystemNonForeignAssetsPalletTx(
 			api,
 			direction,
-			isForeignAssetsTransfer
+			isForeignAssetsTransfer,
+			isParachainPrimaryNativeAsset
 		)
 	) {
 		return XcmPalletName.xTokens;
@@ -56,11 +58,12 @@ export const establishXcmPallet = (
 const isXTokensParaToSystemNonForeignAssetsPalletTx = (
 	api: ApiPromise,
 	direction?: Direction,
-	isForeignAssetsTransfer?: boolean
+	isForeignAssetsTransfer?: boolean,
+	isParachainPrimaryNativeAsset?: boolean
 ): boolean => {
 	if (
-		isForeignAssetsTransfer != undefined &&
 		!isForeignAssetsTransfer &&
+		!isParachainPrimaryNativeAsset &&
 		direction &&
 		direction === Direction.ParaToSystem &&
 		api.tx.xTokens