@metamask/keyring-snap-sdk
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MetaMask Keyring Snap SDK
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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"]}