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Keyring instance.\n * @param request - Keyring JSON-RPC request.\n * @returns A promise that resolves to the keyring response.\n */\nasync function dispatchKeyringRequest(\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 `${KeyringRpcMethod.GetAccounts}`: {\n      assert(request, GetAccountsRequestStruct);\n      return keyring.getAccounts();\n    }\n\n    case `${KeyringRpcMethod.GetAccount}`: {\n      assert(request, GetAccountRequestStruct);\n      return keyring.getAccount(request.params.id);\n    }\n\n    case `${KeyringRpcMethod.CreateAccounts}`: {\n      assert(request, CreateAccountsRequestStruct);\n      return keyring.createAccounts(request.params);\n    }\n\n    case `${KeyringRpcMethod.DeleteAccount}`: {\n      assert(request, DeleteAccountRequestStruct);\n      return keyring.deleteAccount(request.params.id);\n    }\n\n    case `${KeyringRpcMethod.ExportAccount}`: {\n      if (keyring.exportAccount === undefined) {\n        throw new MethodNotSupportedError(request.method);\n      }\n      assert(request, ExportAccountRequestStruct);\n      return keyring.exportAccount(request.params.id, request.params.options);\n    }\n\n    case `${KeyringRpcMethod.SubmitRequest}`: {\n      assert(request, SubmitRequestRequestStruct);\n      return keyring.submitRequest(request.params);\n    }\n\n    default: {\n      throw new MethodNotSupportedError(request.method);\n    }\n  }\n}\n\n/**\n * Handles a keyring (v2) JSON-RPC request.\n *\n * This function is meant to be used as a handler for Keyring (v2) 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 dispatchKeyringRequest(keyring, request);\n  } catch (error) {\n    if (isSnapError(error)) {\n      throw error;\n    }\n\n    const message =\n      error instanceof Error && typeof error.message === 'string'\n        ? error.message\n        : 'An unknown error occurred while handling the keyring (v2) request';\n\n    throw new Error(message);\n  }\n}\n"]}