@metamask/snaps-rpc-methods
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MetaMask Snaps JSON-RPC method implementations
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type { Messenger } from '@metamask/messenger';\nimport type {\n PermissionSpecificationBuilder,\n RestrictedMethodOptions,\n ValidPermissionSpecification,\n} from '@metamask/permission-controller';\nimport { PermissionType, SubjectType } from '@metamask/permission-controller';\nimport { rpcErrors } from '@metamask/rpc-errors';\nimport {\n DialogType,\n enumValue,\n ComponentOrElementStruct,\n selectiveUnion,\n} from '@metamask/snaps-sdk';\nimport type {\n DialogParams,\n Component,\n PromptDialog,\n DialogResult,\n} from '@metamask/snaps-sdk';\nimport type { InferMatching } from '@metamask/snaps-utils';\nimport type { Infer } from '@metamask/superstruct';\nimport { create, object, optional, size, string } from '@metamask/superstruct';\nimport type { NonEmptyArray } from '@metamask/utils';\nimport { hasProperty, isObject, isPlainObject } from '@metamask/utils';\n\nimport type {\n ApprovalControllerAddRequestAction,\n SnapInterfaceControllerCreateInterfaceAction,\n SnapInterfaceControllerGetInterfaceAction,\n SnapInterfaceControllerSetInterfaceDisplayedAction,\n} from '../types';\n\nconst methodName = 'snap_dialog';\n\nexport type DialogApprovalTypes = Record<DialogType, string> & {\n default: string;\n};\n\nexport const DIALOG_APPROVAL_TYPES = {\n [DialogType.Alert]: `${methodName}:alert`,\n [DialogType.Confirmation]: `${methodName}:confirmation`,\n [DialogType.Prompt]: `${methodName}:prompt`,\n default: methodName,\n};\n\nconst PlaceholderStruct = optional(size(string(), 1, 40));\n\nexport type Placeholder = Infer<typeof PlaceholderStruct>;\n\nexport type DialogMessengerActions =\n | ApprovalControllerAddRequestAction\n | SnapInterfaceControllerCreateInterfaceAction\n | SnapInterfaceControllerGetInterfaceAction\n | SnapInterfaceControllerSetInterfaceDisplayedAction;\n\ntype DialogSpecificationBuilderOptions = {\n allowedCaveats?: Readonly<NonEmptyArray<string>> | null;\n messenger: Messenger<string, DialogMessengerActions>;\n};\n\ntype DialogSpecification = ValidPermissionSpecification<{\n permissionType: PermissionType.RestrictedMethod;\n targetName: typeof methodName;\n methodImplementation: ReturnType<typeof getDialogImplementation>;\n allowedCaveats: Readonly<NonEmptyArray<string>> | null;\n}>;\n\n/**\n * The specification builder for the `snap_dialog` permission. `snap_dialog`\n * lets the Snap display one of the following dialogs to the user:\n * - An alert, for displaying information.\n * - A confirmation, for accepting or rejecting some action.\n * - A prompt, for inputting some information.\n *\n * @param options - The specification builder options.\n * @param options.allowedCaveats - The optional allowed caveats for the\n * permission.\n * @param options.messenger - The messenger.\n * @returns The specification for the `snap_dialog` permission.\n */\nconst specificationBuilder: PermissionSpecificationBuilder<\n PermissionType.RestrictedMethod,\n DialogSpecificationBuilderOptions,\n DialogSpecification\n> = ({\n allowedCaveats = null,\n messenger,\n}: DialogSpecificationBuilderOptions) => {\n return {\n permissionType: PermissionType.RestrictedMethod,\n targetName: methodName,\n allowedCaveats,\n methodImplementation: getDialogImplementation({ messenger }),\n subjectTypes: [SubjectType.Snap],\n };\n};\n\n/* eslint-disable jsdoc/check-indentation */\n/**\n * Display a [dialog](https://docs.metamask.io/snaps/features/custom-ui/dialogs/)\n * in the MetaMask UI.\n *\n * - `type` - The type of dialog. Not providing a type will create a fully\n * [custom dialog](https://docs.metamask.io/snaps/features/custom-ui/dialogs/#display-a-custom-dialog).\n * Possible values are:\n * - `alert` - An alert that can only be acknowledged.\n * - `confirmation` - A confirmation that can be accepted or rejected.\n * - `prompt` - A prompt where the user can enter a text response.\n *\n * - One of:\n * - `content` - The content of the alert, as a\n * [custom UI](https://docs.metamask.io/snaps/features/custom-ui/) component.\n * - `id` - The ID of an\n * [interactive interface](https://docs.metamask.io/snaps/reference/snaps-api/snap_createinterface).\n * - `placeholder` - An optional placeholder text to display in the dialog. Only\n * applicable for the `prompt` dialog.\n *\n * @example\n * ```ts\n * import { Box, Heading, Text } from '@metamask/snaps-sdk/jsx';\n *\n * const walletAddress = await snap.request({\n * method: 'snap_dialog',\n * params: {\n * type: 'prompt',\n * content: (\n * <Box>\n * <Heading>What is the wallet address?</Heading>\n * <Text>Please enter the wallet address to be monitored.</Text>\n * </Box>\n * ),\n * placeholder: '0x123...',\n * },\n * });\n *\n * // `walletAddress` will be a string containing the address entered by the\n * // user.\n * ```\n */\nexport const dialogBuilder = Object.freeze({\n targetName: methodName,\n specificationBuilder,\n actionNames: [\n 'ApprovalController:addRequest',\n 'SnapInterfaceController:createInterface',\n 'SnapInterfaceController:getInterface',\n 'SnapInterfaceController:setInterfaceDisplayed',\n ],\n} as const);\n/* eslint-enable jsdoc/check-indentation */\n\nconst AlertParametersWithContentStruct = object({\n type: enumValue(DialogType.Alert),\n content: ComponentOrElementStruct,\n});\n\nconst AlertParametersWithIdStruct = object({\n type: enumValue(DialogType.Alert),\n id: string(),\n});\n\nconst AlertParametersStruct = selectiveUnion((value) => {\n if (isPlainObject(value) && hasProperty(value, 'id')) {\n return AlertParametersWithIdStruct;\n }\n return AlertParametersWithContentStruct;\n});\n\nconst ConfirmationParametersWithContentStruct = object({\n type: enumValue(DialogType.Confirmation),\n content: ComponentOrElementStruct,\n});\n\nconst ConfirmationParametersWithIdStruct = object({\n type: enumValue(DialogType.Confirmation),\n id: string(),\n});\n\nconst ConfirmationParametersStruct = selectiveUnion((value) => {\n if (isPlainObject(value) && hasProperty(value, 'id')) {\n return ConfirmationParametersWithIdStruct;\n }\n return ConfirmationParametersWithContentStruct;\n});\n\nconst PromptParametersWithContentStruct = object({\n type: enumValue(DialogType.Prompt),\n content: ComponentOrElementStruct,\n placeholder: PlaceholderStruct,\n});\n\nconst PromptParametersWithIdStruct = object({\n type: enumValue(DialogType.Prompt),\n id: string(),\n placeholder: PlaceholderStruct,\n});\n\nconst PromptParametersStruct = selectiveUnion((value) => {\n if (isPlainObject(value) && hasProperty(value, 'id')) {\n return PromptParametersWithIdStruct;\n }\n return PromptParametersWithContentStruct;\n});\n\nconst DefaultParametersWithContentStruct = object({\n content: ComponentOrElementStruct,\n});\n\nconst DefaultParametersWithIdStruct = object({\n id: string(),\n});\n\nconst DefaultParametersStruct = selectiveUnion((value) => {\n if (isPlainObject(value) && hasProperty(value, 'id')) {\n return DefaultParametersWithIdStruct;\n }\n return DefaultParametersWithContentStruct;\n});\n\nconst DialogParametersStruct = selectiveUnion((value) => {\n if (isPlainObject(value) && hasProperty(value, 'type')) {\n switch (value.type) {\n // We cannot use typedUnion here unfortunately.\n case DialogType.Alert:\n return AlertParametersStruct;\n case DialogType.Confirmation:\n return ConfirmationParametersStruct;\n case DialogType.Prompt:\n return PromptParametersStruct;\n default:\n throw new Error(\n `The \"type\" property must be one of: ${Object.values(DialogType).join(\n ', ',\n )}.`,\n );\n }\n }\n return DefaultParametersStruct;\n});\n\nexport type DialogParameters = InferMatching<\n typeof DialogParametersStruct,\n DialogParams\n>;\n\n/**\n * Builds the method implementation for `snap_dialog`.\n *\n * @param options - The options.\n * @param options.messenger - The messenger.\n * @returns The method implementation which return value depends on the dialog\n * type, valid return types are: string, boolean, null.\n */\nexport function getDialogImplementation({\n messenger,\n}: DialogSpecificationBuilderOptions) {\n return async function dialogImplementation(\n args: RestrictedMethodOptions<DialogParameters>,\n ): Promise<DialogResult> {\n const {\n params,\n context: { origin },\n } = args;\n\n if (!isObject(params)) {\n throw rpcErrors.invalidParams({\n message: 'Invalid params: Expected params to be a single object.',\n });\n }\n\n const validatedParams = getValidatedParams(params);\n const placeholder = isPromptDialog(validatedParams)\n ? validatedParams.placeholder\n : undefined;\n\n const validatedType = hasProperty(validatedParams, 'type')\n ? validatedParams.type\n : 'default';\n\n const approvalType =\n DIALOG_APPROVAL_TYPES[\n validatedType as keyof typeof DIALOG_APPROVAL_TYPES\n ];\n\n if (hasProperty(validatedParams, 'content')) {\n const id = messenger.call(\n 'SnapInterfaceController:createInterface',\n origin,\n validatedParams.content as Component,\n );\n\n messenger.call(\n 'SnapInterfaceController:setInterfaceDisplayed',\n origin,\n id,\n );\n\n return messenger.call(\n 'ApprovalController:addRequest',\n {\n id: approvalType === DIALOG_APPROVAL_TYPES.default ? id : undefined,\n origin,\n type: approvalType,\n requestData: { id, placeholder },\n },\n true,\n );\n }\n\n validateInterface(origin, validatedParams.id, messenger);\n\n messenger.call(\n 'SnapInterfaceController:setInterfaceDisplayed',\n origin,\n validatedParams.id,\n );\n\n return messenger.call(\n 'ApprovalController:addRequest',\n {\n id:\n approvalType === DIALOG_APPROVAL_TYPES.default\n ? validatedParams.id\n : undefined,\n origin,\n type: approvalType,\n requestData: { id: validatedParams.id, placeholder },\n },\n true,\n );\n };\n}\n/**\n * Validate that the interface ID is valid.\n *\n * @param origin - The origin of the request.\n * @param id - The interface ID.\n * @param messenger - The messenger.\n */\nfunction validateInterface(\n origin: string,\n id: string,\n messenger: Messenger<string, SnapInterfaceControllerGetInterfaceAction>,\n) {\n try {\n messenger.call('SnapInterfaceController:getInterface', origin, id);\n } catch (error) {\n throw rpcErrors.invalidParams({\n message: `Invalid params: ${error.message}`,\n });\n }\n}\n\n/**\n * Gets the dialog type from the dialog parameters.\n *\n * @param params - The dialog parameters.\n * @returns The dialog type.\n */\nfunction getDialogType(params: DialogParameters): DialogType | undefined {\n return hasProperty(params, 'type') ? (params.type as DialogType) : undefined;\n}\n\n/**\n * Checks if the dialog parameters are for a prompt dialog.\n *\n * @param params - The dialog parameters.\n * @returns `true` if the dialog parameters are for a prompt dialog, `false` otherwise.\n */\nfunction isPromptDialog(params: DialogParameters): params is PromptDialog {\n return getDialogType(params) === DialogType.Prompt;\n}\n\n/**\n * Validates the confirm method `params` and returns them cast to the correct\n * type. Throws if validation fails.\n *\n * @param params - The unvalidated params object from the method request.\n * @returns The validated confirm method parameter object.\n */\nfunction getValidatedParams(params: unknown): DialogParameters {\n try {\n return create(params, DialogParametersStruct);\n } catch (error) {\n throw rpcErrors.invalidParams({\n message: `Invalid params: ${error.message}`,\n });\n }\n}\n"]}