@metamask/snaps-utils
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A collection of utilities for MetaMask Snaps
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type { SupportedCurve } from '@metamask/key-tree';\nimport { isValidBIP32PathSegment } from '@metamask/key-tree';\nimport type { EmptyObject, InitialPermissions } from '@metamask/snaps-sdk';\nimport type { Describe, Infer, Struct } from '@metamask/superstruct';\nimport {\n array,\n boolean,\n create,\n enums,\n integer,\n is,\n literal,\n object,\n optional,\n refine,\n record,\n size,\n string,\n type,\n union,\n intersection,\n} from '@metamask/superstruct';\nimport {\n assertStruct,\n ChecksumStruct,\n VersionStruct,\n isValidSemVerRange,\n inMilliseconds,\n Duration,\n CaipChainIdStruct,\n} from '@metamask/utils';\n\nimport { isEqual } from '../array';\nimport { CronjobSpecificationArrayStruct } from '../cronjob';\nimport { SIP_6_MAGIC_VALUE, STATE_ENCRYPTION_MAGIC_VALUE } from '../entropy';\nimport { KeyringOriginsStruct, RpcOriginsStruct } from '../json-rpc';\nimport { SnapIdStruct } from '../snaps';\nimport { mergeStructs, type InferMatching } from '../structs';\nimport { NameStruct, NpmSnapFileNames, uri } from '../types';\n\n// BIP-43 purposes that cannot be used for entropy derivation. These are in the\n// string form, ending with `'`.\nconst FORBIDDEN_PURPOSES: string[] = [\n SIP_6_MAGIC_VALUE,\n STATE_ENCRYPTION_MAGIC_VALUE,\n];\n\nexport const FORBIDDEN_COIN_TYPES: number[] = [60];\nconst FORBIDDEN_PATHS: string[][] = FORBIDDEN_COIN_TYPES.map((coinType) => [\n 'm',\n \"44'\",\n `${coinType}'`,\n]);\n\nexport const Bip32PathStruct = refine(\n array(string()),\n 'BIP-32 path',\n (path: string[]) => {\n if (path.length === 0) {\n return 'Path must be a non-empty BIP-32 derivation path array';\n }\n\n if (path[0] !== 'm') {\n return 'Path must start with \"m\".';\n }\n\n if (path.length < 3) {\n return 'Paths must have a length of at least three.';\n }\n\n if (path.slice(1).some((part) => !isValidBIP32PathSegment(part))) {\n return 'Path must be a valid BIP-32 derivation path array.';\n }\n\n if (FORBIDDEN_PURPOSES.includes(path[1])) {\n return `The purpose \"${path[1]}\" is not allowed for entropy derivation.`;\n }\n\n if (\n FORBIDDEN_PATHS.some((forbiddenPath) =>\n isEqual(path.slice(0, forbiddenPath.length), forbiddenPath),\n )\n ) {\n return `The path \"${path.join(\n '/',\n )}\" is not allowed for entropy derivation.`;\n }\n\n return true;\n },\n);\n\nexport const bip32entropy = <\n Type extends { path: string[]; curve: string },\n Schema,\n>(\n struct: Struct<Type, Schema>,\n) =>\n refine(struct, 'BIP-32 entropy', (value) => {\n if (\n value.curve === 'ed25519' &&\n value.path.slice(1).some((part) => !part.endsWith(\"'\"))\n ) {\n return 'Ed25519 does not support unhardened paths.';\n }\n\n return true;\n });\n\nexport const CurveStruct: Describe<SupportedCurve> = enums([\n 'ed25519',\n 'secp256k1',\n 'ed25519Bip32',\n]);\n\n// Used outside @metamask/snap-utils\nexport const Bip32EntropyStruct = bip32entropy(\n type({\n path: Bip32PathStruct,\n curve: CurveStruct,\n }),\n);\n\nexport type Bip32Entropy = Infer<typeof Bip32EntropyStruct>;\n\nexport const SnapGetBip32EntropyPermissionsStruct = size(\n array(Bip32EntropyStruct),\n 1,\n Infinity,\n);\n\nexport const SemVerRangeStruct = refine(string(), 'SemVer range', (value) => {\n if (isValidSemVerRange(value)) {\n return true;\n }\n return 'Expected a valid SemVer range.';\n});\n\nexport const SnapIdsStruct = refine(\n record(SnapIdStruct, object({ version: optional(SemVerRangeStruct) })),\n 'SnapIds',\n (value) => {\n if (Object.keys(value).length === 0) {\n return false;\n }\n\n return true;\n },\n);\n\nexport type SnapIds = Infer<typeof SnapIdsStruct>;\n\nexport const ChainIdsStruct = size(array(CaipChainIdStruct), 1, Infinity);\n\nexport const LookupMatchersStruct = union([\n object({\n tlds: size(array(string()), 1, Infinity),\n }),\n object({\n schemes: size(array(string()), 1, Infinity),\n }),\n object({\n tlds: size(array(string()), 1, Infinity),\n schemes: size(array(string()), 1, Infinity),\n }),\n]);\n\nexport const MINIMUM_REQUEST_TIMEOUT = inMilliseconds(5, Duration.Second);\nexport const MAXIMUM_REQUEST_TIMEOUT = inMilliseconds(3, Duration.Minute);\n\nexport const MaxRequestTimeStruct = size(\n integer(),\n MINIMUM_REQUEST_TIMEOUT,\n MAXIMUM_REQUEST_TIMEOUT,\n);\n\nexport const ProtocolScopesStruct = record(\n CaipChainIdStruct,\n object({ methods: array(string()) }),\n);\n\n// Utility type to union with for all handler structs\nexport const HandlerCaveatsStruct = object({\n maxRequestTime: optional(MaxRequestTimeStruct),\n});\n\nexport type HandlerCaveats = Infer<typeof HandlerCaveatsStruct>;\n\nexport const EmptyObjectStruct = object<EmptyObject>({}) as unknown as Struct<\n EmptyObject,\n null\n>;\n\n/* eslint-disable @typescript-eslint/naming-convention */\nexport const PermissionsStruct: Describe<InitialPermissions> = type({\n 'endowment:assets': optional(\n mergeStructs(HandlerCaveatsStruct, object({ scopes: ChainIdsStruct })),\n ),\n 'endowment:cronjob': optional(\n mergeStructs(\n HandlerCaveatsStruct,\n object({ jobs: optional(CronjobSpecificationArrayStruct) }),\n ),\n ),\n 'endowment:ethereum-provider': optional(EmptyObjectStruct),\n 'endowment:keyring': optional(\n mergeStructs(HandlerCaveatsStruct, KeyringOriginsStruct),\n ),\n 'endowment:protocol': optional(\n mergeStructs(\n HandlerCaveatsStruct,\n object({ scopes: ProtocolScopesStruct }),\n ),\n ),\n 'endowment:lifecycle-hooks': optional(HandlerCaveatsStruct),\n 'endowment:name-lookup': optional(\n mergeStructs(\n HandlerCaveatsStruct,\n object({\n chains: optional(ChainIdsStruct),\n matchers: optional(LookupMatchersStruct),\n }),\n ),\n ),\n 'endowment:network-access': optional(EmptyObjectStruct),\n 'endowment:page-home': optional(HandlerCaveatsStruct),\n 'endowment:rpc': optional(\n mergeStructs(HandlerCaveatsStruct, RpcOriginsStruct),\n ),\n 'endowment:signature-insight': optional(\n mergeStructs(\n HandlerCaveatsStruct,\n object({\n allowSignatureOrigin: optional(boolean()),\n }),\n ),\n ),\n 'endowment:transaction-insight': optional(\n mergeStructs(\n HandlerCaveatsStruct,\n object({\n allowTransactionOrigin: optional(boolean()),\n }),\n ),\n ),\n 'endowment:webassembly': optional(EmptyObjectStruct),\n snap_dialog: optional(EmptyObjectStruct),\n snap_manageState: optional(EmptyObjectStruct),\n snap_manageAccounts: optional(EmptyObjectStruct),\n snap_notify: optional(EmptyObjectStruct),\n snap_getBip32Entropy: optional(SnapGetBip32EntropyPermissionsStruct),\n snap_getBip32PublicKey: optional(SnapGetBip32EntropyPermissionsStruct),\n snap_getBip44Entropy: optional(\n size(\n array(object({ coinType: size(integer(), 0, 2 ** 32 - 1) })),\n 1,\n Infinity,\n ),\n ),\n snap_getEntropy: optional(EmptyObjectStruct),\n snap_getLocale: optional(EmptyObjectStruct),\n wallet_snap: optional(SnapIdsStruct),\n});\n/* eslint-enable @typescript-eslint/naming-convention */\n\nexport type SnapPermissions = InferMatching<\n typeof PermissionsStruct,\n InitialPermissions\n>;\n\nexport const SnapAuxilaryFilesStruct = array(string());\n\nexport const InitialConnectionsStruct = record(\n intersection([string(), uri()]),\n object({}),\n);\n\nexport type InitialConnections = Infer<typeof InitialConnectionsStruct>;\n\nexport const SnapManifestStruct = object({\n version: VersionStruct,\n description: size(string(), 1, 280),\n proposedName: size(string(), 1, 214),\n repository: optional(\n type({\n type: size(string(), 1, Infinity),\n url: size(string(), 1, Infinity),\n }),\n ),\n source: object({\n shasum: ChecksumStruct,\n location: object({\n npm: object({\n filePath: size(string(), 1, Infinity),\n iconPath: optional(size(string(), 1, Infinity)),\n packageName: NameStruct,\n registry: union([\n literal('https://registry.npmjs.org'),\n literal('https://registry.npmjs.org/'),\n ]),\n }),\n }),\n files: optional(SnapAuxilaryFilesStruct),\n locales: optional(SnapAuxilaryFilesStruct),\n }),\n initialConnections: optional(InitialConnectionsStruct),\n initialPermissions: PermissionsStruct,\n manifestVersion: literal('0.1'),\n platformVersion: optional(VersionStruct),\n $schema: optional(string()), // enables JSON-Schema linting in VSC and other IDEs\n});\n\nexport type SnapManifest = Infer<typeof SnapManifestStruct>;\n\n/**\n * Check if the given value is a valid {@link SnapManifest} object.\n *\n * @param value - The value to check.\n * @returns Whether the value is a valid {@link SnapManifest} object.\n */\nexport function isSnapManifest(value: unknown): value is SnapManifest {\n return is(value, SnapManifestStruct);\n}\n\n/**\n * Assert that the given value is a valid {@link SnapManifest} object.\n *\n * @param value - The value to check.\n * @throws If the value is not a valid {@link SnapManifest} object.\n */\nexport function assertIsSnapManifest(\n value: unknown,\n): asserts value is SnapManifest {\n assertStruct(\n value,\n SnapManifestStruct,\n `\"${NpmSnapFileNames.Manifest}\" is invalid`,\n );\n}\n\n/**\n * Creates a {@link SnapManifest} object from JSON.\n *\n * @param value - The value to check.\n * @throws If the value cannot be coerced to a {@link SnapManifest} object.\n * @returns The created {@link SnapManifest} object.\n */\nexport function createSnapManifest(value: unknown): SnapManifest {\n // TODO: Add a utility to prefix these errors similar to assertStruct\n return create(value, SnapManifestStruct);\n}\n"]}