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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"]}