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{ CodedError, Platform } from '@unimodules/core';\nimport compareUrls from 'compare-urls';\nimport { AppState, Dimensions, AppStateStatus } from 'react-native';\n\nimport {\n WebBrowserAuthSessionResult,\n WebBrowserOpenOptions,\n WebBrowserResult,\n WebBrowserResultType,\n WebBrowserWindowFeatures,\n} from './WebBrowser.types';\n\nconst POPUP_WIDTH = 500;\nconst POPUP_HEIGHT = 650;\n\nlet popupWindow: Window | null = null;\n\nconst listenerMap = new Map();\n\nconst getHandle = () => 'ExpoWebBrowserRedirectHandle';\nconst getOriginUrlHandle = (hash: string) => `ExpoWebBrowser_OriginUrl_${hash}`;\nconst getRedirectUrlHandle = (hash: string) => `ExpoWebBrowser_RedirectUrl_${hash}`;\n\nfunction dismissPopup() {\n if (!popupWindow) {\n return;\n }\n popupWindow.close();\n if (listenerMap.has(popupWindow)) {\n const { listener, appStateListener, interval } = listenerMap.get(popupWindow);\n clearInterval(interval);\n window.removeEventListener('message', listener);\n AppState.removeEventListener('change', appStateListener);\n listenerMap.delete(popupWindow);\n\n const handle = window.localStorage.getItem(getHandle());\n if (handle) {\n window.localStorage.removeItem(getHandle());\n window.localStorage.removeItem(getOriginUrlHandle(handle));\n window.localStorage.removeItem(getRedirectUrlHandle(handle));\n }\n\n popupWindow = null;\n }\n}\n\nexport default {\n get name() {\n return 'ExpoWebBrowser';\n },\n async openBrowserAsync(\n url: string,\n browserParams: WebBrowserOpenOptions = {}\n ): Promise<WebBrowserResult> {\n if (!Platform.isDOMAvailable) return { type: WebBrowserResultType.CANCEL };\n const { windowName = '_blank', windowFeatures } = browserParams;\n const features = getPopupFeaturesString(windowFeatures);\n window.open(url, windowName, features);\n return { type: WebBrowserResultType.OPENED };\n },\n dismissAuthSession() {\n if (!Platform.isDOMAvailable) return;\n dismissPopup();\n },\n maybeCompleteAuthSession({\n skipRedirectCheck,\n }: {\n skipRedirectCheck?: boolean;\n }): { type: 'success' | 'failed'; message: string } {\n if (!Platform.isDOMAvailable) {\n return {\n type: 'failed',\n message: 'Cannot use expo-web-browser in a non-browser environment',\n };\n }\n const handle = window.localStorage.getItem(getHandle());\n\n if (!handle) {\n return { type: 'failed', message: 'No auth session is currently in progress' };\n }\n\n const url = window.location.href;\n\n if (skipRedirectCheck !== true) {\n const redirectUrl = window.localStorage.getItem(getRedirectUrlHandle(handle));\n // Compare the original redirect url against the current url with it's query params removed.\n const currentUrl = window.location.origin + window.location.pathname;\n if (!compareUrls(redirectUrl, currentUrl)) {\n return {\n type: 'failed',\n message: `Current URL \"${currentUrl}\" and original redirect URL \"${redirectUrl}\" do not match.`,\n };\n }\n }\n\n // Save the link for app state listener\n window.localStorage.setItem(getOriginUrlHandle(handle), url);\n\n // Get the window that created the current popup\n const parent = window.opener ?? window.parent;\n if (!parent) {\n throw new CodedError(\n 'ERR_WEB_BROWSER_REDIRECT',\n `The window cannot complete the redirect request because the invoking window doesn't have a reference to it's parent. This can happen if the parent window was reloaded.`\n );\n }\n // Send the URL back to the opening window.\n parent.postMessage({ url, expoSender: handle }, parent.location);\n return { type: 'success', message: `Attempting to complete auth` };\n\n // Maybe set timer to throw an error if the window is still open after attempting to complete.\n },\n // This method should be invoked from user input.\n async openAuthSessionAsync(\n url: string,\n redirectUrl?: string,\n openOptions?: WebBrowserOpenOptions\n ): Promise<WebBrowserAuthSessionResult> {\n if (!Platform.isDOMAvailable) return { type: WebBrowserResultType.CANCEL };\n\n redirectUrl = redirectUrl ?? getRedirectUrlFromUrlOrGenerate(url);\n\n const state = await getStateFromUrlOrGenerateAsync(url);\n\n // Save handle for session\n window.localStorage.setItem(getHandle(), state);\n // Save redirect Url for further verification\n window.localStorage.setItem(getRedirectUrlHandle(state), redirectUrl);\n\n if (popupWindow == null || popupWindow?.closed) {\n const features = getPopupFeaturesString(openOptions?.windowFeatures);\n popupWindow = window.open(url, openOptions?.windowName, features);\n\n if (popupWindow) {\n try {\n popupWindow.focus();\n } catch (e) {}\n } else {\n throw new CodedError(\n 'ERR_WEB_BROWSER_BLOCKED',\n 'Popup window was blocked by the browser or failed to open. This can happen in mobile browsers when the window.open() method was invoked too long after a user input was fired.'\n );\n }\n }\n\n return new Promise(async resolve => {\n // Create a listener for messages sent from the popup\n const listener = (event: MessageEvent) => {\n if (!event.isTrusted) return;\n // Ensure we trust the sender.\n if (event.origin !== window.location.origin) {\n return;\n }\n const { data } = event;\n // Use a crypto hash to invalid message.\n const handle = window.localStorage.getItem(getHandle());\n // Ensure the sender is also from expo-web-browser\n if (data.expoSender === handle) {\n dismissPopup();\n resolve({ type: 'success', url: data.url });\n }\n };\n\n // Add a listener for receiving messages from the popup.\n window.addEventListener('message', listener, false);\n\n // Create an app state listener as a fallback to the popup listener\n const appStateListener = (state: AppStateStatus) => {\n if (state !== 'active') {\n return;\n }\n const handle = window.localStorage.getItem(getHandle());\n if (handle) {\n const url = window.localStorage.getItem(getOriginUrlHandle(handle));\n if (url) {\n dismissPopup();\n resolve({ type: 'success', url });\n }\n }\n };\n\n AppState.addEventListener('change', appStateListener);\n\n // Check if the window has been closed every second.\n const interval = setInterval(() => {\n if (popupWindow?.closed) {\n if (resolve) resolve({ type: WebBrowserResultType.DISMISS });\n clearInterval(interval);\n dismissPopup();\n }\n }, 1000);\n\n // Store the listener and interval for clean up.\n listenerMap.set(popupWindow, {\n listener,\n interval,\n appStateListener,\n });\n });\n },\n};\n\n// Crypto\nfunction isCryptoAvailable(): boolean {\n if (!Platform.isDOMAvailable) return false;\n return !!(window?.crypto as any);\n}\n\nfunction isSubtleCryptoAvailable(): boolean {\n if (!isCryptoAvailable()) return false;\n return !!(window.crypto.subtle as any);\n}\n\nasync function getStateFromUrlOrGenerateAsync(inputUrl: string): Promise<string> {\n const url = new URL(inputUrl);\n if (url.searchParams.has('state') && typeof url.searchParams.get('state') === 'string') {\n // Ensure we reuse the auth state if it's passed in.\n return url.searchParams.get('state')!;\n }\n // Generate a crypto state for verifying the return popup.\n return await generateStateAsync();\n}\n\nfunction getRedirectUrlFromUrlOrGenerate(inputUrl: string): string {\n const url = new URL(inputUrl);\n if (\n url.searchParams.has('redirect_uri') &&\n typeof url.searchParams.get('redirect_uri') === 'string'\n ) {\n // Ensure we reuse the redirect_uri if it's passed in the input url.\n return url.searchParams.get('redirect_uri')!;\n }\n // Emulate how native uses Constants.linkingUrl\n return location.origin + location.pathname;\n}\n\nconst CHARSET = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';\n\nasync function generateStateAsync(): Promise<string> {\n if (!isSubtleCryptoAvailable()) {\n throw new CodedError(\n 'ERR_WEB_BROWSER_CRYPTO',\n `The current environment doesn't support crypto. Ensure you are running from a secure origin (https).`\n );\n }\n const encoder = new TextEncoder();\n\n const data = generateRandom(10);\n const buffer = encoder.encode(data);\n const hashedData = await crypto.subtle.digest('SHA-256', buffer);\n const state = btoa(String.fromCharCode(...new Uint8Array(hashedData)));\n return state;\n}\n\nfunction generateRandom(size: number): string {\n let arr = new Uint8Array(size);\n if (arr.byteLength !== arr.length) {\n arr = new Uint8Array(arr.buffer);\n }\n const array = new Uint8Array(arr.length);\n if (isCryptoAvailable()) {\n window.crypto.getRandomValues(array);\n } else {\n for (let i = 0; i < size; i += 1) {\n array[i] = (Math.random() * CHARSET.length) | 0;\n }\n }\n return bufferToString(array);\n}\n\nfunction bufferToString(buffer): string {\n const state: string[] = [];\n for (let i = 0; i < buffer.byteLength; i += 1) {\n const index = buffer[i] % CHARSET.length;\n state.push(CHARSET[index]);\n }\n return state.join('');\n}\n\n// Window Features\n\n// Ensure feature string is an object\nfunction normalizePopupFeaturesString(\n options?: WebBrowserWindowFeatures | string\n): Record<string, any> {\n let windowFeatures: Record<string, any> = {};\n // This should be avoided because it adds extra time to the popup command.\n if (typeof options === 'string') {\n // Convert string of `key=value,foo=bar` into an object\n const windowFeaturePairs = options.split(',');\n for (const pair of windowFeaturePairs) {\n const [key, value] = pair.trim().split('=');\n if (key && value) {\n windowFeaturePairs[key] = value;\n }\n }\n } else if (options) {\n windowFeatures = options;\n }\n return windowFeatures;\n}\n\n// Apply default values to the input feature set\nfunction getPopupFeaturesString(options?: WebBrowserWindowFeatures | string): string {\n const windowFeatures = normalizePopupFeaturesString(options);\n\n const width = windowFeatures.width ?? POPUP_WIDTH;\n const height = windowFeatures.height ?? POPUP_HEIGHT;\n\n const dimensions = Dimensions.get('screen');\n const top = windowFeatures.top ?? Math.max(0, (dimensions.height - height) * 0.5);\n const left = windowFeatures.left ?? Math.max(0, (dimensions.width - width) * 0.5);\n\n // Create a reasonable popup\n // https://developer.mozilla.org/en-US/docs/Web/API/Window/open#Window_features\n return featureObjectToString({\n ...windowFeatures,\n // Toolbar buttons (Back, Forward, Reload, Stop buttons).\n toolbar: windowFeatures.toolbar ?? 'no',\n menubar: windowFeatures.menubar ?? 'no',\n // Shows the location bar or the address bar.\n location: windowFeatures.location ?? 'yes',\n resizable: windowFeatures.resizable ?? 'yes',\n // If this feature is on, then the new secondary window has a status bar.\n status: windowFeatures.status ?? 'no',\n scrollbars: windowFeatures.scrollbars ?? 'yes',\n top,\n left,\n width,\n height,\n });\n}\n\nexport function featureObjectToString(features: Record<string, any>): string {\n return Object.keys(features).reduce<string>((prev, current) => {\n let value = features[current];\n if (typeof value === 'boolean') {\n value = value ? 'yes' : 'no';\n }\n if (current && value) {\n if (prev) prev += ',';\n return `${prev}${current}=${value}`;\n }\n return prev;\n }, '');\n}\n"]} |