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{ BaseController } from '@metamask/base-controller';\nimport type {\n ControllerGetStateAction,\n StateMetadata,\n} from '@metamask/base-controller';\nimport type { ControllerStateChangeEvent } from '@metamask/base-controller';\nimport type { Messenger } from '@metamask/messenger';\nimport type { JsonRpcError, DataWithOptionalCause } from '@metamask/rpc-errors';\nimport { rpcErrors } from '@metamask/rpc-errors';\nimport type { Json, OptionalField } from '@metamask/utils';\nimport { nanoid } from 'nanoid';\n\nimport type { ApprovalControllerMethodActions } from './ApprovalController-method-action-types';\nimport {\n ApprovalRequestNotFoundError,\n ApprovalRequestNoResultSupportError,\n EndInvalidFlowError,\n NoApprovalFlowsError,\n MissingApprovalFlowError,\n} from './errors';\n\n// Constants\n\n// Avoiding dependency on controller-utils\nexport const ORIGIN_METAMASK = 'metamask';\nexport const APPROVAL_TYPE_RESULT_ERROR = 'result_error';\nexport const APPROVAL_TYPE_RESULT_SUCCESS = 'result_success';\n\nconst controllerName = 'ApprovalController';\n\nconst stateMetadata: StateMetadata = {\n pendingApprovals: {\n includeInStateLogs: true,\n persist: false,\n includeInDebugSnapshot: true,\n usedInUi: true,\n },\n pendingApprovalCount: {\n includeInStateLogs: true,\n persist: false,\n includeInDebugSnapshot: false,\n usedInUi: true,\n },\n approvalFlows: {\n includeInStateLogs: true,\n persist: false,\n includeInDebugSnapshot: false,\n usedInUi: true,\n },\n};\n\nconst getAlreadyPendingMessage = (origin: string, type: string) =>\n `Request of type '${type}' already pending for origin ${origin}. Please wait.`;\n\nconst getDefaultState = (): ApprovalControllerState => {\n return {\n pendingApprovals: {},\n pendingApprovalCount: 0,\n approvalFlows: [],\n };\n};\n\n// === MESSENGER ===\n\nconst MESSENGER_EXPOSED_METHODS = [\n 'acceptRequest',\n 'add',\n 'addAndShowApprovalRequest',\n 'addRequest',\n 'clearRequests',\n 'endFlow',\n 'get',\n 'getApprovalCount',\n 'getTotalApprovalCount',\n 'hasRequest',\n 'rejectRequest',\n 'setFlowLoadingText',\n 'showError',\n 'showSuccess',\n 'startFlow',\n 'updateRequestState',\n] as const;\n\n// Internal Types\n\ntype ApprovalPromiseResolve = (value?: unknown | AddResult) => void;\n\ntype ApprovalPromiseReject = (error?: unknown) => void;\n\ntype ApprovalRequestData = Record | null;\n\ntype ApprovalRequestState = Record | null;\n\ntype ApprovalCallbacks = {\n resolve: ApprovalPromiseResolve;\n reject: ApprovalPromiseReject;\n};\n\ntype ApprovalFlow = {\n id: string;\n loadingText: string | null;\n};\n\ntype ResultOptions = {\n flowToEnd?: string;\n header?: (string | ResultComponent)[];\n icon?: string | null;\n title?: string | null;\n};\n\n// Miscellaneous Types\n\nexport type ApprovalRequest = {\n /**\n * The ID of the approval request.\n */\n id: string;\n\n /**\n * The origin of the approval request.\n */\n origin: string;\n\n /**\n * The time that the request was received, per Date.now().\n */\n time: number;\n\n /**\n * The type of the approval request.\n * Unfortunately, not all values will match the `ApprovalType` enum, so we are using `string` here.\n * TODO: Replace `string` with `ApprovalType` when all `type` values used by the clients can be encompassed by the `ApprovalType` enum.\n */\n type: string;\n\n /**\n * Additional data associated with the request.\n */\n requestData: RequestData;\n\n /**\n * Additional mutable state associated with the request\n */\n requestState: ApprovalRequestState;\n\n /**\n * Whether the request expects a result object to be returned instead of just the approval value.\n */\n expectsResult: boolean;\n};\n\nexport type ApprovalFlowState = ApprovalFlow;\n\nexport type ApprovalControllerState = {\n pendingApprovals: Record>>;\n pendingApprovalCount: number;\n approvalFlows: ApprovalFlowState[];\n};\n\nexport type ApprovalControllerMessenger = Messenger<\n typeof controllerName,\n ApprovalControllerActions,\n ApprovalControllerEvents\n>;\n\n// Option Types\n\nexport type ShowApprovalRequest = () => void | Promise;\n\nexport type ResultComponent = {\n /**\n * A unique identifier for this instance of the component.\n */\n key: string;\n\n /**\n * The name of the component to render.\n */\n name: string;\n\n /**\n * Any properties required by the component.\n */\n properties?: Record;\n\n /**\n * Any child components to render inside the component.\n */\n children?: string | ResultComponent | (string | ResultComponent)[];\n};\n\nexport type ApprovalControllerOptions = {\n messenger: ApprovalControllerMessenger;\n showApprovalRequest: ShowApprovalRequest;\n state?: Partial;\n typesExcludedFromRateLimiting?: string[];\n};\n\nexport type AddApprovalOptions = {\n id?: string;\n origin: string;\n type: string;\n requestData?: Record;\n requestState?: Record;\n expectsResult?: boolean;\n};\n\nexport type UpdateRequestStateOptions = {\n id: string;\n requestState: Record;\n};\n\nexport type AcceptOptions = {\n /**\n * Whether to resolve the returned promise only when the request creator indicates the success of the\n * post-approval logic using the result callbacks.\n * If false or unspecified, the promise will resolve immediately.\n */\n waitForResult?: boolean;\n\n /**\n * Whether to delete the approval request after a result callback is called.\n * If false or unspecified, the approval request will be deleted immediately.\n * Ignored if `waitForResult` is false or unspecified.\n */\n deleteAfterResult?: boolean;\n};\n\nexport type StartFlowOptions = OptionalField<\n ApprovalFlow,\n 'id' | 'loadingText'\n> & { show?: boolean };\n\nexport type EndFlowOptions = Pick;\n\nexport type SetFlowLoadingTextOptions = ApprovalFlow;\n\nexport type SuccessOptions = ResultOptions & {\n message?: string | ResultComponent | (string | ResultComponent)[];\n};\n\nexport type ErrorOptions = ResultOptions & {\n error?: string | ResultComponent | (string | ResultComponent)[];\n};\n\n// Result Types\n\nexport type AcceptResultCallbacks = {\n /**\n * Inform the request acceptor that the post-approval logic was successful.\n *\n * @param value - An optional value generated by the post-approval logic.\n */\n success: (value?: unknown) => void;\n\n /**\n * Inform the request acceptor that the post-approval logic failed.\n *\n * @param error - The reason for the failure.\n */\n error: (error: Error) => void;\n};\n\nexport type AddResult = {\n /**\n * An optional value provided by the request acceptor.\n */\n value?: unknown;\n\n /**\n * Callback functions that must be used to indicate to the request acceptor whether the post-approval logic was successful or not.\n * Will be undefined if the request acceptor did not specify that they want to wait for a result.\n */\n resultCallbacks?: AcceptResultCallbacks;\n};\n\nexport type AcceptResult = {\n /**\n * An optional value provided by the request creator when indicating a successful result.\n */\n value?: unknown;\n};\n\nexport type ApprovalFlowStartResult = ApprovalFlow;\n\nexport type SuccessResult = Record;\n\nexport type ErrorResult = Record;\n\n// Event Types\n\nexport type ApprovalStateChange = ControllerStateChangeEvent<\n typeof controllerName,\n ApprovalControllerState\n>;\n\nexport type ApprovalControllerEvents = ApprovalStateChange;\n\n// Action Types\n\nexport type ApprovalControllerGetStateAction = ControllerGetStateAction<\n typeof controllerName,\n ApprovalControllerState\n>;\n\nexport type ApprovalControllerActions =\n | ApprovalControllerGetStateAction\n | ApprovalControllerMethodActions;\n\n/**\n * Controller for managing requests that require user approval.\n *\n * Enables limiting the number of pending requests by origin and type, counting\n * pending requests, and more.\n *\n * Adding a request returns a promise that resolves or rejects when the request\n * is approved or denied, respectively.\n */\nexport class ApprovalController extends BaseController<\n typeof controllerName,\n ApprovalControllerState,\n ApprovalControllerMessenger\n> {\n readonly #approvals: Map;\n\n readonly #origins: Map>;\n\n readonly #showApprovalRequest: () => void;\n\n readonly #typesExcludedFromRateLimiting: string[];\n\n /**\n * Construct an Approval controller.\n *\n * @param options - The controller options.\n * @param options.showApprovalRequest - Function for opening the UI such that\n * the request can be displayed to the user.\n * @param options.messenger - The restricted messenger for the Approval controller.\n * @param options.state - The initial controller state.\n * @param options.typesExcludedFromRateLimiting - Array of approval types which allow multiple pending approval requests from the same origin.\n */\n constructor({\n messenger,\n showApprovalRequest,\n state = {},\n typesExcludedFromRateLimiting = [],\n }: ApprovalControllerOptions) {\n super({\n name: controllerName,\n metadata: stateMetadata,\n messenger,\n state: { ...getDefaultState(), ...state },\n });\n\n this.#approvals = new Map();\n this.#origins = new Map();\n // TODO: Either fix this lint violation or explain why it's necessary to ignore.\n // eslint-disable-next-line @typescript-eslint/no-misused-promises\n this.#showApprovalRequest = showApprovalRequest;\n this.#typesExcludedFromRateLimiting = typesExcludedFromRateLimiting;\n this.messenger.registerMethodActionHandlers(\n this,\n MESSENGER_EXPOSED_METHODS,\n );\n }\n\n /**\n * Adds an approval request per the given arguments, optionally showing\n * the approval request to the user.\n *\n * @param opts - Options bag.\n * @param opts.id - The id of the approval request. A random id will be\n * generated if none is provided.\n * @param opts.origin - The origin of the approval request.\n * @param opts.type - The type associated with the approval request.\n * @param opts.requestData - Additional data associated with the request,\n * if any.\n * @param opts.requestState - Additional state associated with the request,\n * if any.\n * @param shouldShowRequest - Whether to show the approval request to the user.\n * @returns The approval promise.\n */\n addRequest(\n opts: AddApprovalOptions,\n shouldShowRequest: boolean,\n ): Promise {\n if (shouldShowRequest) {\n return this.addAndShowApprovalRequest(opts);\n }\n return this.add(opts);\n }\n\n /**\n * Adds an approval request per the given arguments, calls the show approval\n * request function, and returns the associated approval promise resolving to\n * an AddResult object.\n *\n * There can only be one approval per origin and type. An error is thrown if\n * attempting to add an invalid or duplicate request.\n *\n * @param opts - Options bag.\n * @param opts.id - The id of the approval request. A random id will be\n * generated if none is provided.\n * @param opts.origin - The origin of the approval request.\n * @param opts.type - The type associated with the approval request.\n * @param opts.requestData - Additional data associated with the request,\n * @param opts.requestState - Additional state associated with the request,\n * if any.\n * @returns The approval promise resolving to an AddResult object.\n */\n addAndShowApprovalRequest(\n opts: AddApprovalOptions & { expectsResult: true },\n ): Promise;\n\n /**\n * Adds an approval request per the given arguments, calls the show approval\n * request function, and returns the associated approval promise resolving\n * to a value provided during acceptance.\n *\n * There can only be one approval per origin and type. An error is thrown if\n * attempting to add an invalid or duplicate request.\n *\n * @param opts - Options bag.\n * @param opts.id - The id of the approval request. A random id will be\n * generated if none is provided.\n * @param opts.origin - The origin of the approval request.\n * @param opts.type - The type associated with the approval request.\n * @param opts.requestData - Additional data associated with the request,\n * @param opts.requestState - Additional state associated with the request,\n * if any.\n * @returns The approval promise resolving to a value provided during acceptance.\n */\n addAndShowApprovalRequest(opts: AddApprovalOptions): Promise;\n\n addAndShowApprovalRequest(opts: AddApprovalOptions): Promise {\n const promise = this.#add(\n opts.origin,\n opts.type,\n opts.id,\n opts.requestData,\n opts.requestState,\n opts.expectsResult,\n );\n this.#showApprovalRequest();\n return promise;\n }\n\n /**\n * Adds an approval request per the given arguments and returns the approval\n * promise resolving to an AddResult object.\n *\n * There can only be one approval per origin and type. An error is thrown if\n * attempting to add an invalid or duplicate request.\n *\n * @param opts - Options bag.\n * @param opts.id - The id of the approval request. A random id will be\n * generated if none is provided.\n * @param opts.origin - The origin of the approval request.\n * @param opts.type - The type associated with the approval request.\n * @param opts.requestData - Additional data associated with the request,\n * if any.\n * @returns The approval promise resolving to an AddResult object.\n */\n add(opts: AddApprovalOptions & { expectsResult: true }): Promise;\n\n /**\n * Adds an approval request per the given arguments and returns the approval\n * promise resolving to a value provided during acceptance.\n *\n * There can only be one approval per origin and type. An error is thrown if\n * attempting to add an invalid or duplicate request.\n *\n * @param opts - Options bag.\n * @param opts.id - The id of the approval request. A random id will be\n * generated if none is provided.\n * @param opts.origin - The origin of the approval request.\n * @param opts.type - The type associated with the approval request.\n * @param opts.requestData - Additional data associated with the request,\n * if any.\n * @returns The approval promise resolving to a value provided during acceptance.\n */\n add(opts: AddApprovalOptions): Promise;\n\n add(opts: AddApprovalOptions): Promise {\n return this.#add(\n opts.origin,\n opts.type,\n opts.id,\n opts.requestData,\n opts.requestState,\n opts.expectsResult,\n );\n }\n\n /**\n * Gets the info for the approval request with the given id.\n *\n * @param id - The id of the approval request.\n * @returns The approval request data associated with the id.\n */\n get(id: string): ApprovalRequest | undefined {\n return this.state.pendingApprovals[id];\n }\n\n /**\n * Gets the number of pending approvals, by origin and/or type.\n *\n * If only `origin` is specified, all approvals for that origin will be\n * counted, regardless of type.\n * If only `type` is specified, all approvals for that type will be counted,\n * regardless of origin.\n * If both `origin` and `type` are specified, 0 or 1 will be returned.\n *\n * @param opts - The approval count options.\n * @param opts.origin - An approval origin.\n * @param opts.type - The type of the approval request.\n * @returns The current approval request count for the given origin and/or\n * type.\n */\n getApprovalCount(opts: { origin?: string; type?: string } = {}): number {\n if (!opts.origin && !opts.type) {\n throw new Error('Must specify origin, type, or both.');\n }\n const { origin, type: _type } = opts;\n\n if (origin && _type) {\n return this.#origins.get(origin)?.get(_type) || 0;\n }\n\n if (origin) {\n return Array.from(\n (this.#origins.get(origin) || new Map()).values(),\n ).reduce((total, value) => total + value, 0);\n }\n\n // Only \"type\" was specified\n let count = 0;\n for (const approval of Object.values(this.state.pendingApprovals)) {\n if (approval.type === _type) {\n count += 1;\n }\n }\n return count;\n }\n\n /**\n * Get the total count of all pending approval requests for all origins.\n *\n * @returns The total pending approval request count.\n */\n getTotalApprovalCount(): number {\n return this.state.pendingApprovalCount;\n }\n\n /**\n * Checks if there's a pending approval request per the given parameters.\n * At least one parameter must be specified. An error will be thrown if the\n * parameters are invalid.\n *\n * If `id` is specified, all other parameters will be ignored.\n * If `id` is not specified, the method will check for requests that match\n * all of the specified parameters.\n *\n * @param opts - Options bag.\n * @param opts.id - The ID to check for.\n * @param opts.origin - The origin to check for.\n * @param opts.type - The type to check for.\n * @returns `true` if a matching approval is found, and `false` otherwise.\n */\n hasRequest(\n opts: { id?: string; origin?: string; type?: string } = {},\n ): boolean {\n const { id, origin, type: _type } = opts;\n\n if (id) {\n if (typeof id !== 'string') {\n throw new Error('May not specify non-string id.');\n }\n return this.#approvals.has(id);\n }\n\n if (_type && typeof _type !== 'string') {\n throw new Error('May not specify non-string type.');\n }\n\n if (origin) {\n if (typeof origin !== 'string') {\n throw new Error('May not specify non-string origin.');\n }\n\n // Check origin and type pair if type also specified\n if (_type) {\n return Boolean(this.#origins.get(origin)?.get(_type));\n }\n return this.#origins.has(origin);\n }\n\n if (_type) {\n for (const approval of Object.values(this.state.pendingApprovals)) {\n if (approval.type === _type) {\n return true;\n }\n }\n return false;\n }\n throw new Error(\n 'Must specify a valid combination of id, origin, and type.',\n );\n }\n\n /**\n * Resolves the promise of the approval with the given id, and deletes the\n * approval. Throws an error if no such approval exists.\n *\n * @param id - The id of the approval request.\n * @param value - The value to resolve the approval promise with.\n * @param options - Options bag.\n * @returns A promise that either resolves once a result is provided by\n * the creator of the approval request, or immediately if `options.waitForResult`\n * is `false` or `undefined`.\n */\n acceptRequest(\n id: string,\n value?: unknown,\n options?: AcceptOptions,\n ): Promise {\n // Safe to cast as the delete method below will throw if the ID is not found\n const approval = this.get(id) as ApprovalRequest;\n const requestPromise = this.#getCallbacks(id);\n let requestDeleted = false;\n\n if (!options?.deleteAfterResult || !options.waitForResult) {\n this.#delete(id);\n requestDeleted = true;\n }\n\n return new Promise((resolve, reject) => {\n const resultCallbacks: AcceptResultCallbacks = {\n success: (acceptValue?: unknown) => resolve({ value: acceptValue }),\n error: reject,\n };\n\n if (options?.waitForResult && !approval.expectsResult) {\n reject(new ApprovalRequestNoResultSupportError(id));\n return;\n }\n\n const resultValue = options?.waitForResult ? resultCallbacks : undefined;\n\n const resolveValue = approval.expectsResult\n ? { value, resultCallbacks: resultValue }\n : value;\n\n requestPromise.resolve(resolveValue);\n\n if (!options?.waitForResult) {\n resolve({ value: undefined });\n }\n }).finally(() => {\n if (!requestDeleted) {\n this.#delete(id);\n }\n });\n }\n\n /**\n * Rejects the promise of the approval with the given id, and deletes the\n * approval. Throws an error if no such approval exists.\n *\n * @param id - The id of the approval request.\n * @param error - The error to reject the approval promise with.\n */\n rejectRequest(id: string, error: unknown): void {\n const callbacks = this.#getCallbacks(id);\n this.#delete(id);\n callbacks.reject(error);\n }\n\n /**\n * Rejects and deletes all approval requests.\n *\n * @param rejectionError - The JsonRpcError to reject the approval\n * requests with.\n */\n clearRequests(rejectionError: JsonRpcError): void {\n for (const id of this.#approvals.keys()) {\n this.rejectRequest(id, rejectionError);\n }\n this.#origins.clear();\n this.update((draftState) => {\n draftState.pendingApprovals = {};\n draftState.pendingApprovalCount = 0;\n });\n }\n\n /**\n * Updates the request state of the approval with the given id.\n *\n * @param opts - Options bag.\n * @param opts.id - The id of the approval request.\n * @param opts.requestState - Additional data associated with the request\n */\n updateRequestState(opts: UpdateRequestStateOptions): void {\n if (!this.state.pendingApprovals[opts.id]) {\n throw new ApprovalRequestNotFoundError(opts.id);\n }\n\n this.update((draftState) => {\n draftState.pendingApprovals[opts.id].requestState =\n opts.requestState as never;\n });\n }\n\n /**\n * Starts a new approval flow.\n *\n * @param opts - Options bag.\n * @param opts.id - The id of the approval flow.\n * @param opts.loadingText - The loading text that will be associated to the approval flow.\n * @param opts.show - A flag to determine whether the approval should show to the user.\n * @returns The object containing the approval flow id.\n */\n startFlow(opts: StartFlowOptions = {}): ApprovalFlowStartResult {\n const id = opts.id ?? nanoid();\n const loadingText = opts.loadingText ?? null;\n\n this.update((draftState) => {\n draftState.approvalFlows.push({ id, loadingText });\n });\n\n // By default, if nothing else is specified, we always show the approval.\n if (opts.show !== false) {\n this.#showApprovalRequest();\n }\n\n return { id, loadingText };\n }\n\n /**\n * Ends the current approval flow.\n *\n * @param opts - Options bag.\n * @param opts.id - The id of the approval flow that will be finished.\n */\n endFlow({ id }: EndFlowOptions) {\n if (!this.state.approvalFlows.length) {\n throw new NoApprovalFlowsError();\n }\n\n const currentFlow = this.state.approvalFlows.slice(-1)[0];\n\n if (id !== currentFlow.id) {\n throw new EndInvalidFlowError(\n id,\n this.state.approvalFlows.map((flow) => flow.id),\n );\n }\n\n this.update((draftState) => {\n draftState.approvalFlows.pop();\n });\n }\n\n /**\n * Sets the loading text for the approval flow.\n *\n * @param opts - Options bag.\n * @param opts.id - The approval flow loading text that will be displayed.\n * @param opts.loadingText - The loading text that will be associated to the approval flow.\n */\n setFlowLoadingText({ id, loadingText }: SetFlowLoadingTextOptions) {\n const flowIndex = this.state.approvalFlows.findIndex(\n (flow) => flow.id === id,\n );\n\n if (flowIndex === -1) {\n throw new MissingApprovalFlowError(id);\n }\n\n this.update((draftState) => {\n draftState.approvalFlows[flowIndex].loadingText = loadingText;\n });\n }\n\n /**\n * Show a success page.\n *\n * @param opts - Options bag.\n * @param opts.message - The message text or components to display in the page.\n * @param opts.header - The text or components to display in the header of the page.\n * @param opts.flowToEnd - The ID of the approval flow to end once the success page is approved.\n * @param opts.title - The title to display above the message. Shown by default but can be hidden with `null`.\n * @param opts.icon - The icon to display in the page. Shown by default but can be hidden with `null`.\n * @returns Empty object to support future additions.\n */\n async showSuccess(opts: SuccessOptions = {}): Promise {\n await this.#result(APPROVAL_TYPE_RESULT_SUCCESS, opts, {\n message: opts.message,\n header: opts.header,\n title: opts.title,\n icon: opts.icon,\n } as Record);\n\n return {};\n }\n\n /**\n * Show an error page.\n *\n * @param opts - Options bag.\n * @param opts.message - The message text or components to display in the page.\n * @param opts.header - The text or components to display in the header of the page.\n * @param opts.flowToEnd - The ID of the approval flow to end once the error page is approved.\n * @param opts.title - The title to display above the message. Shown by default but can be hidden with `null`.\n * @param opts.icon - The icon to display in the page. Shown by default but can be hidden with `null`.\n * @returns Empty object to support future additions.\n */\n async showError(opts: ErrorOptions = {}): Promise {\n await this.#result(APPROVAL_TYPE_RESULT_ERROR, opts, {\n error: opts.error,\n header: opts.header,\n title: opts.title,\n icon: opts.icon,\n } as Record);\n\n return {};\n }\n\n /**\n * Implementation of add operation.\n *\n * @param origin - The origin of the approval request.\n * @param type - The type associated with the approval request.\n * @param id - The id of the approval request.\n * @param requestData - The request data associated with the approval request.\n * @param requestState - The request state associated with the approval request.\n * @param expectsResult - Whether the approval request expects a result object to be returned.\n * @returns The approval promise.\n */\n #add(\n origin: string,\n type: string,\n id: string = nanoid(),\n requestData?: Record,\n requestState?: Record,\n expectsResult?: boolean,\n ): Promise {\n this.#validateAddParams(id, origin, type, requestData, requestState);\n\n if (\n !this.#typesExcludedFromRateLimiting.includes(type) &&\n this.hasRequest({ origin, type })\n ) {\n throw rpcErrors.resourceUnavailable(\n getAlreadyPendingMessage(origin, type),\n );\n }\n\n // add pending approval\n return new Promise((resolve, reject) => {\n this.#approvals.set(id, { resolve, reject });\n this.#addPendingApprovalOrigin(origin, type);\n\n this.#addToStore(\n id,\n origin,\n type,\n requestData,\n requestState,\n expectsResult,\n );\n });\n }\n\n /**\n * Validates parameters to the add method.\n *\n * @param id - The id of the approval request.\n * @param origin - The origin of the approval request.\n * @param type - The type associated with the approval request.\n * @param requestData - The request data associated with the approval request.\n * @param requestState - The request state associated with the approval request.\n */\n #validateAddParams(\n id: string,\n origin: string,\n type: string,\n requestData?: Record,\n requestState?: Record,\n ): void {\n let errorMessage = null;\n if (!id || typeof id !== 'string') {\n errorMessage = 'Must specify non-empty string id.';\n } else if (this.#approvals.has(id)) {\n errorMessage = `Approval request with id '${id}' already exists.`;\n } else if (!origin || typeof origin !== 'string') {\n errorMessage = 'Must specify non-empty string origin.';\n } else if (!type || typeof type !== 'string') {\n errorMessage = 'Must specify non-empty string type.';\n } else if (\n requestData &&\n (typeof requestData !== 'object' || Array.isArray(requestData))\n ) {\n errorMessage = 'Request data must be a plain object if specified.';\n } else if (\n requestState &&\n (typeof requestState !== 'object' || Array.isArray(requestState))\n ) {\n errorMessage = 'Request state must be a plain object if specified.';\n }\n\n if (errorMessage) {\n throw rpcErrors.internal(errorMessage);\n }\n }\n\n /**\n * Adds an entry to _origins.\n * Performs no validation.\n *\n * @param origin - The origin of the approval request.\n * @param type - The type associated with the approval request.\n */\n #addPendingApprovalOrigin(origin: string, type: string): void {\n let originMap = this.#origins.get(origin);\n\n if (!originMap) {\n originMap = new Map();\n this.#origins.set(origin, originMap);\n }\n\n const currentValue = originMap.get(type) || 0;\n originMap.set(type, currentValue + 1);\n }\n\n /**\n * Adds an entry to the store.\n * Performs no validation.\n *\n * @param id - The id of the approval request.\n * @param origin - The origin of the approval request.\n * @param type - The type associated with the approval request.\n * @param requestData - The request data associated with the approval request.\n * @param requestState - The request state associated with the approval request.\n * @param expectsResult - Whether the request expects a result object to be returned.\n */\n #addToStore(\n id: string,\n origin: string,\n type: string,\n requestData?: Record,\n requestState?: Record,\n expectsResult?: boolean,\n ): void {\n const approval = {\n id,\n origin,\n type,\n time: Date.now(),\n requestData: requestData || null,\n requestState: requestState || null,\n expectsResult: expectsResult || false,\n };\n\n this.update((draftState) => {\n draftState.pendingApprovals[id] = approval as never;\n\n draftState.pendingApprovalCount = Object.keys(\n draftState.pendingApprovals,\n ).length;\n });\n }\n\n /**\n * Deletes the approval with the given id.\n *\n * Deletion is an internal operation because approval state is solely\n * managed by this controller.\n *\n * @param id - The id of the approval request to be deleted.\n */\n #delete(id: string): void {\n if (!this.#approvals.has(id)) {\n throw new ApprovalRequestNotFoundError(id);\n }\n\n this.#approvals.delete(id);\n\n const { origin, type } = this.state.pendingApprovals[id];\n\n const originMap = this.#origins.get(origin) as Map;\n const originTotalCount = this.getApprovalCount({ origin });\n const originTypeCount = originMap.get(type) as number;\n\n if (originTotalCount === 1) {\n this.#origins.delete(origin);\n } else {\n originMap.set(type, originTypeCount - 1);\n }\n\n this.update((draftState) => {\n delete draftState.pendingApprovals[id];\n draftState.pendingApprovalCount = Object.keys(\n draftState.pendingApprovals,\n ).length;\n });\n }\n\n #getCallbacks(id: string): ApprovalCallbacks {\n const callbacks = this.#approvals.get(id);\n\n if (!callbacks) {\n throw new ApprovalRequestNotFoundError(id);\n }\n\n return callbacks;\n }\n\n async #result(\n type: string,\n opts: ResultOptions,\n requestData: Record,\n ) {\n try {\n await this.addAndShowApprovalRequest({\n origin: ORIGIN_METAMASK,\n type,\n requestData,\n });\n } catch (error) {\n console.info('Failed to display result page', error);\n } finally {\n if (opts.flowToEnd) {\n try {\n this.endFlow({ id: opts.flowToEnd });\n } catch (error) {\n console.info('Failed to end flow', { id: opts.flowToEnd, error });\n }\n }\n }\n }\n}\n\nexport default ApprovalController;\n"]}