feat(sdk-coin-canton): added pre-approval builder

modules/sdk-coin-canton/resources/hash/hash.d.ts

@@ -0,0 +1,5 @@
+import type { IPreparedTransaction } from '../../src/lib/iface';
+
+declare module '../../resources/hash/hash.js' {
+  export function computePreparedTransaction(preparedTransaction: IPreparedTransaction): Promise<Uint8Array>;
+}

modules/sdk-coin-canton/resources/hash/hash.js

@@ -0,0 +1,297 @@
+// This is the static helper file from canton SDK, replicating it here since we won't be using the canton wallet SDK
+// TODO: https://bitgoinc.atlassian.net/browse/COIN-6016
+const PREPARED_TRANSACTION_HASH_PURPOSE = Uint8Array.from([0x00, 0x00, 0x00, 0x30]);
+const NODE_ENCODING_VERSION = Uint8Array.from([0x01]);
+const HASHING_SCHEME_VERSION = Uint8Array.from([2]);
+async function sha256(message) {
+  const msg = typeof message === 'string' ? new TextEncoder().encode(message) : message;
+  return crypto.subtle.digest('SHA-256', new Uint8Array(msg)).then((hash) => new Uint8Array(hash));
+}
+async function mkByteArray(...args) {
+  const normalizedArgs = args.map((arg) => {
+    if (typeof arg === 'number') {
+      return new Uint8Array([arg]);
+    } else {
+      return arg;
+    }
+  });
+  let totalLength = 0;
+  normalizedArgs.forEach((arg) => {
+    totalLength += arg.length;
+  });
+  const mergedArray = new Uint8Array(totalLength);
+  let offset = 0;
+  normalizedArgs.forEach((arg) => {
+    mergedArray.set(arg, offset);
+    offset += arg.length;
+  });
+  return mergedArray;
+}
+async function encodeBool(value) {
+  return new Uint8Array([value ? 1 : 0]);
+}
+async function encodeInt32(value) {
+  const buffer = new ArrayBuffer(4);
+  const view = new DataView(buffer);
+  view.setInt32(0, value, false); // true for little-endian
+  return new Uint8Array(buffer);
+}
+async function encodeInt64(value) {
+  // eslint-disable-next-line no-undef
+  const num = typeof value === 'bigint' ? value : BigInt(value || 0);
+  const buffer = new ArrayBuffer(8);
+  const view = new DataView(buffer);
+  view.setBigInt64(0, num, false); // true for little-endian
+  return new Uint8Array(buffer);
+}
+export async function encodeString(value = '') {
+  const utf8Bytes = new TextEncoder().encode(value);
+  return encodeBytes(utf8Bytes);
+}
+async function encodeBytes(value) {
+  const length = await encodeInt32(value.length);
+  return mkByteArray(length, value);
+}
+async function encodeHash(value) {
+  return value;
+}
+function encodeHexString(value = '') {
+  // Convert hex string to Uint8Array
+  const bytes = new Uint8Array(value.length / 2);
+  for (let i = 0; i < value.length; i += 2) {
+    bytes[i / 2] = parseInt(value.slice(i, i + 2), 16);
+  }
+  return encodeBytes(bytes);
+}
+// Maybe suspicious?
+async function encodeOptional(value, encodeFn) {
+  if (value === undefined || value === null) {
+    return new Uint8Array([0]); // Return empty array for undefined fields
+  } else {
+    return mkByteArray(1, await encodeFn(value));
+  }
+}
+// Maybe suspicious?
+async function encodeProtoOptional(parentValue, fieldName, value, encodeFn) {
+  if (parentValue && parentValue[fieldName] !== undefined) {
+    return mkByteArray(1, await encodeFn(value));
+  } else {
+    return new Uint8Array([0]); // Return empty array for undefined fields
+  }
+}
+async function encodeRepeated(values = [], encodeFn) {
+  const length = await encodeInt32(values.length);
+  const encodedValues = await Promise.all(values.map(encodeFn));
+  return mkByteArray(length, ...encodedValues);
+}
+function findSeed(nodeId, nodeSeeds) {
+  const seed = nodeSeeds.find((seed) => seed.nodeId.toString() === nodeId)?.seed;
+  return seed;
+}
+async function encodeIdentifier(identifier) {
+  return mkByteArray(
+    await encodeString(identifier.packageId),
+    await encodeRepeated(identifier.moduleName.split('.'), encodeString),
+    await encodeRepeated(identifier.entityName.split('.'), encodeString)
+  );
+}
+async function encodeMetadata(metadata) {
+  return mkByteArray(
+    Uint8Array.from([0x01]),
+    await encodeRepeated(metadata.submitterInfo?.actAs, encodeString),
+    await encodeString(metadata.submitterInfo?.commandId),
+    await encodeString(metadata.transactionUuid),
+    await encodeInt32(metadata.mediatorGroup),
+    await encodeString(metadata.synchronizerId),
+    await encodeProtoOptional(metadata, 'minLedgerEffectiveTime', metadata.minLedgerEffectiveTime, encodeInt64),
+    await encodeProtoOptional(metadata, 'maxLedgerEffectiveTime', metadata.maxLedgerEffectiveTime, encodeInt64),
+    await encodeInt64(metadata.preparationTime),
+    await encodeRepeated(metadata.inputContracts, encodeInputContract)
+  );
+}
+async function encodeCreateNode(create, nodeId, nodeSeeds) {
+  return create
+    ? mkByteArray(
+        NODE_ENCODING_VERSION,
+        await encodeString(create.lfVersion),
+        0 /** Create node tag */,
+        await encodeOptional(findSeed(nodeId, nodeSeeds), encodeHash),
+        await encodeHexString(create.contractId),
+        await encodeString(create.packageName),
+        await encodeIdentifier(create.templateId),
+        await encodeValue(create.argument),
+        await encodeRepeated(create.signatories, encodeString),
+        await encodeRepeated(create.stakeholders, encodeString)
+      )
+    : mkByteArray();
+}
+async function encodeExerciseNode(exercise, nodeId, nodesDict, nodeSeeds) {
+  return mkByteArray(
+    NODE_ENCODING_VERSION,
+    await encodeString(exercise.lfVersion),
+    1 /** Exercise node tag */,
+    await encodeHash(findSeed(nodeId, nodeSeeds)),
+    await encodeHexString(exercise.contractId),
+    await encodeString(exercise.packageName),
+    await encodeIdentifier(exercise.templateId),
+    await encodeRepeated(exercise.signatories, encodeString),
+    await encodeRepeated(exercise.stakeholders, encodeString),
+    await encodeRepeated(exercise.actingParties, encodeString),
+    await encodeProtoOptional(exercise, 'interfaceId', exercise.interfaceId, encodeIdentifier),
+    await encodeString(exercise.choiceId),
+    await encodeValue(exercise.chosenValue),
+    await encodeBool(exercise.consuming),
+    await encodeProtoOptional(exercise, 'exerciseResult', exercise.exerciseResult, encodeValue),
+    await encodeRepeated(exercise.choiceObservers, encodeString),
+    await encodeRepeated(exercise.children, encodeNodeId(nodesDict, nodeSeeds))
+  );
+}
+async function encodeFetchNode(fetch) {
+  return mkByteArray(
+    NODE_ENCODING_VERSION,
+    await encodeString(fetch.lfVersion),
+    2 /** Fetch node tag */,
+    await encodeHexString(fetch.contractId),
+    await encodeString(fetch.packageName),
+    await encodeIdentifier(fetch.templateId),
+    await encodeRepeated(fetch.signatories, encodeString),
+    await encodeRepeated(fetch.stakeholders, encodeString),
+    await encodeProtoOptional(fetch, 'interfaceId', fetch.interfaceId, encodeIdentifier),
+    await encodeRepeated(fetch.actingParties, encodeString)
+  );
+}
+async function encodeRollbackNode(rollback, nodesDict, nodeSeeds) {
+  return mkByteArray(
+    NODE_ENCODING_VERSION,
+    3 /** Rollback node tag */,
+    await encodeRepeated(rollback.children, encodeNodeId(nodesDict, nodeSeeds))
+  );
+}
+async function encodeInputContract(contract) {
+  if (contract.contract.oneofKind === 'v1')
+    return mkByteArray(
+      await encodeInt64(contract.createdAt),
+      await sha256(await encodeCreateNode(contract.contract.v1, 'unused_node_id', []))
+    );
+  else throw new Error('Unsupported contract version');
+}
+async function encodeValue(value) {
+  if (value.sum.oneofKind === 'unit') {
+    return Uint8Array.from([0]); // Unit value
+  } else if (value.sum.oneofKind === 'bool') {
+    return mkByteArray(Uint8Array.from([0x01]), await encodeBool(value.sum.bool));
+  } else if (value.sum.oneofKind === 'int64') {
+    return mkByteArray(Uint8Array.from([0x02]), await encodeInt64(parseInt(value.sum.int64, 10)));
+  } else if (value.sum.oneofKind === 'numeric') {
+    return mkByteArray(Uint8Array.from([0x03]), await encodeString(value.sum.numeric));
+  } else if (value.sum.oneofKind === 'timestamp') {
+    // eslint-disable-next-line no-undef
+    return mkByteArray(Uint8Array.from([0x04]), await encodeInt64(BigInt(value.sum.timestamp)));
+  } else if (value.sum.oneofKind === 'date') {
+    return mkByteArray(Uint8Array.from([0x05]), await encodeInt32(value.sum.date));
+  } else if (value.sum.oneofKind === 'party') {
+    return mkByteArray(Uint8Array.from([0x06]), await encodeString(value.sum.party));
+  } else if (value.sum.oneofKind === 'text') {
+    return mkByteArray(Uint8Array.from([0x07]), await encodeString(value.sum.text));
+  } else if (value.sum.oneofKind === 'contractId') {
+    return mkByteArray(Uint8Array.from([0x08]), await encodeHexString(value.sum.contractId));
+  } else if (value.sum.oneofKind === 'optional') {
+    return mkByteArray(
+      Uint8Array.from([0x09]),
+      await encodeProtoOptional(value.sum.optional, 'value', value.sum.optional.value, encodeValue)
+    );
+  } else if (value.sum.oneofKind === 'list') {
+    return mkByteArray(Uint8Array.from([0x0a]), await encodeRepeated(value.sum.list.elements, encodeValue));
+  } else if (value.sum.oneofKind === 'textMap') {
+    return mkByteArray(Uint8Array.from([0x0b]), await encodeRepeated(value.sum.textMap?.entries, encodeTextMapEntry));
+  } else if (value.sum.oneofKind === 'record') {
+    return mkByteArray(
+      Uint8Array.from([0x0c]),
+      await encodeProtoOptional(value.sum.record, 'recordId', value.sum.record.recordId, encodeIdentifier),
+      await encodeRepeated(value.sum.record.fields, encodeRecordField)
+    );
+  } else if (value.sum.oneofKind === 'variant') {
+    return mkByteArray(
+      Uint8Array.from([0x0d]),
+      await encodeProtoOptional(value.sum.variant, 'variantId', value.sum.variant.variantId, encodeIdentifier),
+      await encodeString(value.sum.variant.constructor),
+      await encodeValue(value.sum.variant.value)
+    );
+  } else if (value.sum.oneofKind === 'enum') {
+    return mkByteArray(
+      Uint8Array.from([0x0e]),
+      await encodeProtoOptional(value.sum.enum, 'enumId', value.sum.enum.enumId, encodeIdentifier),
+      await encodeString(value.sum.enum.constructor)
+    );
+  } else if (value.sum.oneofKind === 'genMap') {
+    return mkByteArray(Uint8Array.from([0x0f]), await encodeRepeated(value.sum.genMap?.entries, encodeGenMapEntry));
+  }
+  throw new Error('Unsupported value type: ' + JSON.stringify(value));
+}
+async function encodeTextMapEntry(entry) {
+  return mkByteArray(await encodeString(entry.key), await encodeValue(entry.value));
+}
+async function encodeRecordField(field) {
+  return mkByteArray(await encodeOptional(field.label, encodeString), await encodeValue(field.value));
+}
+async function encodeGenMapEntry(entry) {
+  return mkByteArray(await encodeValue(entry.key), await encodeValue(entry.value));
+}
+function encodeNodeId(nodesDict, nodeSeeds) {
+  return async (nodeId) => {
+    const node = nodesDict[nodeId];
+    if (!node) {
+      throw new Error(`Node with ID ${nodeId} not found in transaction`);
+    }
+    const encodedNode = await encodeNode(node, nodesDict, nodeSeeds);
+    return sha256(encodedNode);
+  };
+}
+async function encodeNode(node, nodesDict, nodeSeeds) {
+  if (node.versionedNode.oneofKind === 'v1') {
+    if (node.versionedNode.v1.nodeType.oneofKind === 'create') {
+      return encodeCreateNode(node.versionedNode.v1.nodeType.create, node.nodeId, nodeSeeds);
+    } else if (node.versionedNode.v1.nodeType.oneofKind === 'exercise') {
+      return encodeExerciseNode(node.versionedNode.v1.nodeType.exercise, node.nodeId, nodesDict, nodeSeeds);
+    } else if (node.versionedNode.v1.nodeType.oneofKind === 'fetch') {
+      return encodeFetchNode(node.versionedNode.v1.nodeType.fetch);
+    } else if (node.versionedNode.v1.nodeType.oneofKind === 'rollback') {
+      return encodeRollbackNode(node.versionedNode.v1.nodeType.rollback, nodesDict, nodeSeeds);
+    }
+    throw new Error('Unsupported node type');
+  } else {
+    throw new Error(`Unsupported node version`);
+  }
+}
+function createNodesDict(preparedTransaction) {
+  const nodesDict = {};
+  const nodes = preparedTransaction.transaction?.nodes || [];
+  for (const node of nodes) {
+    nodesDict[node.nodeId] = node;
+  }
+  return nodesDict;
+}
+async function encodeTransaction(transaction, nodesDict, nodeSeeds) {
+  return mkByteArray(
+    await encodeString(transaction.version),
+    await encodeRepeated(transaction.roots, encodeNodeId(nodesDict, nodeSeeds))
+  );
+}
+async function hashTransaction(transaction, nodesDict) {
+  const encodedTransaction = await encodeTransaction(transaction, nodesDict, transaction.nodeSeeds);
+  const hash = await sha256(await mkByteArray(PREPARED_TRANSACTION_HASH_PURPOSE, encodedTransaction));
+  return hash;
+}
+async function hashMetadata(metadata) {
+  const hash = await sha256(await mkByteArray(PREPARED_TRANSACTION_HASH_PURPOSE, await encodeMetadata(metadata)));
+  return hash;
+}
+async function encodePreparedTransaction(preparedTransaction) {
+  const nodesDict = createNodesDict(preparedTransaction);
+  const transactionHash = await hashTransaction(preparedTransaction.transaction, nodesDict);
+  const metadataHash = await hashMetadata(preparedTransaction.metadata);
+  return mkByteArray(PREPARED_TRANSACTION_HASH_PURPOSE, HASHING_SCHEME_VERSION, transactionHash, metadataHash);
+}
+export async function computePreparedTransaction(preparedTransaction) {
+  return sha256(await encodePreparedTransaction(preparedTransaction));
+}

modules/sdk-coin-canton/src/lib/iface.ts

@@ -27,7 +27,7 @@ export interface CantonPrepareCommandResponse {
   preparedTransaction?: string;
   preparedTransactionHash: string;
   hashingSchemeVersion: string;
-  hashingDetails?: string;
+  hashingDetails?: string | null;
 }
 
 export interface PreparedParty {
@@ -57,3 +57,27 @@ export interface WalletInitRequest {
   confirmationThreshold: number;
   observingParticipantUids: string[];
 }
+
+interface PreApprovalCreateCommand {
+  templateId: string;
+  createArguments: {
+    receiver: string;
+    provider: string;
+    expectedDso: string;
+  };
+}
+
+export interface OneStepEnablementRequest {
+  commandId: string;
+  commands: [
+    {
+      CreateCommand: PreApprovalCreateCommand;
+    }
+  ];
+  disclosedContracts: [];
+  synchronizerId: string;
+  verboseHashing: boolean;
+  actAs: string[];
+  readAs: string[];
+  packageIdSelectionPreference: string[];
+}