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type { Keyring } from '@metamask/keyring-api';\nimport {\n  KeyringRpcMethod,\n  GetAccountRequestStruct,\n  CreateAccountRequestStruct,\n  ListAccountTransactionsRequestStruct,\n  ApproveRequestRequestStruct,\n  DeleteAccountRequestStruct,\n  ExportAccountRequestStruct,\n  GetRequestRequestStruct,\n  RejectRequestRequestStruct,\n  SubmitRequestRequestStruct,\n  UpdateAccountRequestStruct,\n  FilterAccountChainsStruct,\n  ListAccountsRequestStruct,\n  ListRequestsRequestStruct,\n  GetAccountBalancesRequestStruct,\n  ListAccountAssetsRequestStruct,\n  ResolveAccountAddressRequestStruct,\n  DiscoverAccountsRequestStruct,\n} from '@metamask/keyring-api';\nimport type { JsonRpcRequest } from '@metamask/keyring-utils';\nimport { JsonRpcRequestStruct } from '@metamask/keyring-utils';\nimport { assert } from '@metamask/superstruct';\nimport type { Json } from '@metamask/utils';\n\n/**\n * Error thrown when a keyring JSON-RPC method is not supported.\n */\nexport class MethodNotSupportedError extends Error {\n  constructor(method: string) {\n    super(`Method not supported: ${method}`);\n  }\n}\n\n/**\n * Inner function that dispatches JSON-RPC request to the associated Keyring\n * methods.\n *\n * @param keyring - Keyring instance.\n * @param request - Keyring JSON-RPC request.\n * @returns A promise that resolves to the keyring response.\n */\nasync function dispatchRequest(\n  keyring: Keyring,\n  request: JsonRpcRequest,\n): Promise<Json | void> {\n  // We first have to make sure that the request is a valid JSON-RPC request so\n  // we can check its method name.\n  assert(request, JsonRpcRequestStruct);\n\n  switch (request.method) {\n    case `${KeyringRpcMethod.ListAccounts}`: {\n      assert(request, ListAccountsRequestStruct);\n      return keyring.listAccounts();\n    }\n\n    case `${KeyringRpcMethod.GetAccount}`: {\n      assert(request, GetAccountRequestStruct);\n      return keyring.getAccount(request.params.id);\n    }\n\n    case `${KeyringRpcMethod.CreateAccount}`: {\n      assert(request, CreateAccountRequestStruct);\n      return keyring.createAccount(request.params.options);\n    }\n\n    case `${KeyringRpcMethod.DiscoverAccounts}`: {\n      if (keyring.discoverAccounts === undefined) {\n        throw new MethodNotSupportedError(request.method);\n      }\n      assert(request, DiscoverAccountsRequestStruct);\n      return keyring.discoverAccounts(\n        request.params.scopes,\n        request.params.entropySource,\n        request.params.groupIndex,\n      );\n    }\n\n    case `${KeyringRpcMethod.ListAccountTransactions}`: {\n      if (keyring.listAccountTransactions === undefined) {\n        throw new MethodNotSupportedError(request.method);\n      }\n      assert(request, ListAccountTransactionsRequestStruct);\n      return keyring.listAccountTransactions(\n        request.params.id,\n        request.params.pagination,\n      );\n    }\n\n    case `${KeyringRpcMethod.ListAccountAssets}`: {\n      if (keyring.listAccountAssets === undefined) {\n        throw new MethodNotSupportedError(request.method);\n      }\n      assert(request, ListAccountAssetsRequestStruct);\n      return keyring.listAccountAssets(request.params.id);\n    }\n\n    case `${KeyringRpcMethod.GetAccountBalances}`: {\n      if (keyring.getAccountBalances === undefined) {\n        throw new MethodNotSupportedError(request.method);\n      }\n      assert(request, GetAccountBalancesRequestStruct);\n      return keyring.getAccountBalances(\n        request.params.id,\n        request.params.assets,\n      );\n    }\n\n    case `${KeyringRpcMethod.ResolveAccountAddress}`: {\n      if (keyring.resolveAccountAddress === undefined) {\n        throw new MethodNotSupportedError(request.method);\n      }\n      assert(request, ResolveAccountAddressRequestStruct);\n      return keyring.resolveAccountAddress(\n        request.params.scope,\n        request.params.request,\n      );\n    }\n\n    case `${KeyringRpcMethod.FilterAccountChains}`: {\n      assert(request, FilterAccountChainsStruct);\n      return keyring.filterAccountChains(\n        request.params.id,\n        request.params.chains,\n      );\n    }\n\n    case `${KeyringRpcMethod.UpdateAccount}`: {\n      assert(request, UpdateAccountRequestStruct);\n      return keyring.updateAccount(request.params.account);\n    }\n\n    case `${KeyringRpcMethod.DeleteAccount}`: {\n      assert(request, DeleteAccountRequestStruct);\n      return keyring.deleteAccount(request.params.id);\n    }\n\n    case `${KeyringRpcMethod.ExportAccount}`: {\n      if (keyring.exportAccount === undefined) {\n        throw new MethodNotSupportedError(request.method);\n      }\n      assert(request, ExportAccountRequestStruct);\n      return keyring.exportAccount(request.params.id);\n    }\n\n    case `${KeyringRpcMethod.ListRequests}`: {\n      if (keyring.listRequests === undefined) {\n        throw new MethodNotSupportedError(request.method);\n      }\n      assert(request, ListRequestsRequestStruct);\n      return keyring.listRequests();\n    }\n\n    case `${KeyringRpcMethod.GetRequest}`: {\n      if (keyring.getRequest === undefined) {\n        throw new MethodNotSupportedError(request.method);\n      }\n      assert(request, GetRequestRequestStruct);\n      return keyring.getRequest(request.params.id);\n    }\n\n    case `${KeyringRpcMethod.SubmitRequest}`: {\n      assert(request, SubmitRequestRequestStruct);\n      return keyring.submitRequest(request.params);\n    }\n\n    case `${KeyringRpcMethod.ApproveRequest}`: {\n      if (keyring.approveRequest === undefined) {\n        throw new MethodNotSupportedError(request.method);\n      }\n      assert(request, ApproveRequestRequestStruct);\n      return keyring.approveRequest(request.params.id, request.params.data);\n    }\n\n    case `${KeyringRpcMethod.RejectRequest}`: {\n      if (keyring.rejectRequest === undefined) {\n        throw new MethodNotSupportedError(request.method);\n      }\n      assert(request, RejectRequestRequestStruct);\n      return keyring.rejectRequest(request.params.id);\n    }\n\n    default: {\n      throw new MethodNotSupportedError(request.method);\n    }\n  }\n}\n\n/**\n * Handles a keyring JSON-RPC request.\n *\n * This function is meant to be used as a handler for Keyring JSON-RPC requests\n * in an Accounts Snap.\n *\n * @param keyring - Keyring instance.\n * @param request - Keyring JSON-RPC request.\n * @returns A promise that resolves to the keyring response.\n * @example\n * ```ts\n * export const onKeyringRequest: OnKeyringRequestHandler = async ({\n *   origin,\n *   request,\n * }) => {\n *   return await handleKeyringRequest(keyring, request);\n * };\n * ```\n */\nexport async function handleKeyringRequest(\n  keyring: Keyring,\n  request: JsonRpcRequest,\n): Promise<Json | void> {\n  try {\n    return await dispatchRequest(keyring, request);\n  } catch (error) {\n    const message =\n      error instanceof Error && typeof error.message === 'string'\n        ? error.message\n        : 'An unknown error occurred while handling the keyring request';\n\n    throw new Error(message);\n  }\n}\n"]}