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{\n ConnectionIndicator,\n ConnectionState,\n ConnectionStateChangeListener,\n ConnectionStateStore\n} from '@vaadin/common-frontend';\n\nexport interface FlowConfig {\n imports?: () => void;\n}\n\nclass FlowUiInitializationError extends Error {}\n\ninterface AppConfig {\n productionMode: boolean;\n appId: string;\n uidl: any;\n}\n\ninterface AppInitResponse {\n appConfig: AppConfig;\n pushScript?: string;\n}\n\ninterface Router {\n render: (ctx: NavigationParameters, shouldUpdateHistory: boolean) => Promise;\n}\n\ninterface HTMLRouterContainer extends HTMLElement {\n onBeforeEnter?: (ctx: NavigationParameters, cmd: PreventAndRedirectCommands, router: Router) => void | Promise;\n onBeforeLeave?: (ctx: NavigationParameters, cmd: PreventCommands, router: Router) => void | Promise;\n serverConnected?: (cancel: boolean, url?: NavigationParameters) => void;\n serverPaused?: () => void;\n}\n\ninterface FlowRoute {\n action: (params: NavigationParameters) => Promise;\n path: string;\n}\n\ninterface FlowRoot {\n $: any;\n $server: any;\n}\n\nexport interface NavigationParameters {\n pathname: string;\n search: string;\n}\n\nexport interface PreventCommands {\n prevent: () => any;\n}\n\nexport interface PreventAndRedirectCommands extends PreventCommands {\n redirect: (route: string) => any;\n}\n\n// flow uses body for keeping references\nconst flowRoot: FlowRoot = window.document.body as any;\nconst $wnd = window as any as {\n Vaadin: {\n Flow: any;\n TypeScript: any;\n connectionState: ConnectionStateStore;\n listener: any;\n };\n} & EventTarget;\n\n/**\n * Client API for flow UI operations.\n */\nexport class Flow {\n config: FlowConfig;\n response?: AppInitResponse = undefined;\n pathname = '';\n\n container!: HTMLRouterContainer;\n\n // flag used to inform Testbench whether a server route is in progress\n private isActive = false;\n\n private baseRegex = /^\\//;\n private appShellTitle: string;\n\n private navigation: string = '';\n\n constructor(config?: FlowConfig) {\n flowRoot.$ = flowRoot.$ || [];\n this.config = config || {};\n\n // TB checks for the existence of window.Vaadin.Flow in order\n // to consider that TB needs to wait for `initFlow()`.\n $wnd.Vaadin = $wnd.Vaadin || {};\n $wnd.Vaadin.Flow = $wnd.Vaadin.Flow || {};\n $wnd.Vaadin.Flow.clients = {\n TypeScript: {\n isActive: () => this.isActive\n }\n };\n\n // Regular expression used to remove the app-context\n const elm = document.head.querySelector('base');\n this.baseRegex = new RegExp(\n `^${\n // IE11 does not support document.baseURI\n (document.baseURI || (elm && elm.href) || '/').replace(/^https?:\\/\\/[^/]+/i, '')\n }`\n );\n this.appShellTitle = document.title;\n // Put a vaadin-connection-indicator in the dom\n this.addConnectionIndicator();\n }\n\n /**\n * Return a `route` object for vaadin-router in an one-element array.\n *\n * The `FlowRoute` object `path` property handles any route,\n * and the `action` returns the flow container without updating the content,\n * delaying the actual Flow server call to the `onBeforeEnter` phase.\n *\n * This is a specific API for its use with `vaadin-router`.\n */\n get serverSideRoutes(): [FlowRoute] {\n return [\n {\n path: '(.*)',\n action: this.action\n }\n ];\n }\n\n loadingStarted() {\n // Make Testbench know that server request is in progress\n this.isActive = true;\n $wnd.Vaadin.connectionState.loadingStarted();\n }\n\n loadingFinished() {\n // Make Testbench know that server request has finished\n this.isActive = false;\n $wnd.Vaadin.connectionState.loadingFinished();\n\n if ($wnd.Vaadin.listener) {\n // Listeners registered, do not register again.\n return;\n }\n $wnd.Vaadin.listener = {};\n // Listen for click on router-links -> 'link' navigation trigger\n // and on nodes -> 'client' navigation trigger.\n // Use capture phase to detect prevented / stopped events.\n document.addEventListener(\n 'click',\n (_e) => {\n if (_e.target) {\n // eslint-disable-next-line @typescript-eslint/ban-ts-comment\n // @ts-ignore\n if (_e.target.hasAttribute('router-link')) {\n this.navigation = 'link';\n // eslint-disable-next-line @typescript-eslint/ban-ts-comment\n // @ts-ignore\n } else if (_e.composedPath().some((node) => node.nodeName === 'A')) {\n this.navigation = 'client';\n }\n }\n },\n {\n capture: true\n }\n );\n }\n\n private get action(): (params: NavigationParameters) => Promise {\n // Return a function which is bound to the flow instance, thus we can use\n // the syntax `...serverSideRoutes` in vaadin-router.\n return async (params: NavigationParameters) => {\n // Store last action pathname so as we can check it in events\n this.pathname = params.pathname;\n\n if ($wnd.Vaadin.connectionState.online) {\n try {\n await this.flowInit();\n } catch (error) {\n if (error instanceof FlowUiInitializationError) {\n // error initializing Flow: assume connection lost\n $wnd.Vaadin.connectionState.state = ConnectionState.CONNECTION_LOST;\n return this.offlineStubAction();\n } else {\n throw error;\n }\n }\n } else {\n // insert an offline stub\n return this.offlineStubAction();\n }\n\n // When an action happens, navigation will be resolved `onBeforeEnter`\n this.container.onBeforeEnter = (ctx, cmd) => this.flowNavigate(ctx, cmd);\n // For covering the 'server -> client' use case\n this.container.onBeforeLeave = (ctx, cmd) => this.flowLeave(ctx, cmd);\n return this.container;\n };\n }\n\n // Send a remote call to `JavaScriptBootstrapUI` to check\n // whether navigation has to be cancelled.\n private async flowLeave(ctx: NavigationParameters, cmd?: PreventCommands): Promise {\n // server -> server, viewing offline stub, or browser is offline\n const { connectionState } = $wnd.Vaadin;\n if (this.pathname === ctx.pathname || !this.isFlowClientLoaded() || connectionState.offline) {\n return Promise.resolve({});\n }\n // 'server -> client'\n return new Promise((resolve) => {\n this.loadingStarted();\n // The callback to run from server side to cancel navigation\n this.container.serverConnected = (cancel) => {\n resolve(cmd && cancel ? cmd.prevent() : {});\n this.loadingFinished();\n };\n\n // Call server side to check whether we can leave the view\n flowRoot.$server.leaveNavigation(this.getFlowRoutePath(ctx), this.getFlowRouteQuery(ctx));\n });\n }\n\n // Send the remote call to `JavaScriptBootstrapUI` to render the flow\n // route specified by the context\n private async flowNavigate(ctx: NavigationParameters, cmd?: PreventAndRedirectCommands): Promise {\n if (this.response) {\n return new Promise((resolve) => {\n this.loadingStarted();\n // The callback to run from server side once the view is ready\n this.container.serverConnected = (cancel, redirectContext?: NavigationParameters) => {\n if (cmd && cancel) {\n resolve(cmd.prevent());\n } else if (cmd && cmd.redirect && redirectContext) {\n resolve(cmd.redirect(redirectContext.pathname));\n } else {\n this.container.style.display = '';\n resolve(this.container);\n }\n this.loadingFinished();\n };\n\n this.container.serverPaused = () => {\n this.loadingFinished();\n };\n\n // Call server side to navigate to the given route\n flowRoot.$server.connectClient(\n this.getFlowRoutePath(ctx),\n this.getFlowRouteQuery(ctx),\n this.appShellTitle,\n history.state,\n this.navigation\n );\n // Default to history navigation trigger.\n // Link and client cases are handled by click listener in loadingFinished().\n this.navigation = 'history';\n });\n } else {\n // No server response => offline or erroneous connection\n return Promise.resolve(this.container);\n }\n }\n\n private getFlowRoutePath(context: NavigationParameters | Location): string {\n return decodeURIComponent(context.pathname).replace(this.baseRegex, '');\n }\n private getFlowRouteQuery(context: NavigationParameters | Location): string {\n return (context.search && context.search.substring(1)) || '';\n }\n\n // import flow client modules and initialize UI in server side.\n private async flowInit(): Promise {\n // Do not start flow twice\n if (!this.isFlowClientLoaded()) {\n // show flow progress indicator\n this.loadingStarted();\n\n // Initialize server side UI\n this.response = await this.flowInitUi();\n\n const { pushScript, appConfig } = this.response;\n\n if (typeof pushScript === 'string') {\n await this.loadScript(pushScript);\n }\n const { appId } = appConfig;\n\n // Load bootstrap script with server side parameters\n const bootstrapMod = await import('./FlowBootstrap');\n await bootstrapMod.init(this.response);\n\n // Load custom modules defined by user\n if (typeof this.config.imports === 'function') {\n this.injectAppIdScript(appId);\n await this.config.imports();\n }\n\n // we use a custom tag for the flow app container\n const tag = `flow-container-${appId.toLowerCase()}`;\n const serverCreatedContainer = document.querySelector(tag);\n if (serverCreatedContainer) {\n this.container = serverCreatedContainer as HTMLElement;\n } else {\n this.container = document.createElement(tag);\n this.container.id = appId;\n }\n flowRoot.$[appId] = this.container;\n\n // Load flow-client module\n const clientMod = await import('./FlowClient');\n await this.flowInitClient(clientMod);\n\n // hide flow progress indicator\n this.loadingFinished();\n }\n\n // It might be that components created from server expect that their content has been rendered.\n // Appending eagerly the container we avoid these kind of errors.\n // Note that the client router will move this container to the outlet if the navigation succeed\n if (this.container && !this.container.isConnected) {\n this.container.style.display = 'none';\n document.body.appendChild(this.container);\n }\n return this.response!;\n }\n\n private async loadScript(url: string): Promise {\n return new Promise((resolve, reject) => {\n const script = document.createElement('script');\n script.onload = () => resolve();\n script.onerror = reject;\n script.src = url;\n document.body.appendChild(script);\n });\n }\n\n private injectAppIdScript(appId: string) {\n const appIdWithoutHashCode = appId.substring(0, appId.lastIndexOf('-'));\n const scriptAppId = document.createElement('script');\n scriptAppId.type = 'module';\n scriptAppId.setAttribute('data-app-id', appIdWithoutHashCode);\n document.body.append(scriptAppId);\n }\n\n // After the flow-client javascript module has been loaded, this initializes flow UI\n // in the browser.\n private async flowInitClient(clientMod: any): Promise {\n clientMod.init();\n // client init is async, we need to loop until initialized\n return new Promise((resolve) => {\n const intervalId = setInterval(() => {\n // client `isActive() == true` while initializing or processing\n const initializing = Object.keys($wnd.Vaadin.Flow.clients)\n .filter((key) => key !== 'TypeScript')\n .reduce((prev, id) => prev || $wnd.Vaadin.Flow.clients[id].isActive(), false);\n if (!initializing) {\n clearInterval(intervalId);\n resolve();\n }\n }, 5);\n });\n }\n\n // Returns the `appConfig` object\n private async flowInitUi(): Promise {\n // appConfig was sent in the index.html request\n const initial = $wnd.Vaadin && $wnd.Vaadin.TypeScript && $wnd.Vaadin.TypeScript.initial;\n if (initial) {\n $wnd.Vaadin.TypeScript.initial = undefined;\n return Promise.resolve(initial);\n }\n\n // send a request to the `JavaScriptBootstrapHandler`\n return new Promise((resolve, reject) => {\n const xhr = new XMLHttpRequest();\n const httpRequest = xhr as any;\n const requestPath = `?v-r=init&location=${encodeURIComponent(\n this.getFlowRoutePath(location)\n )}&query=${encodeURIComponent(this.getFlowRouteQuery(location))}`;\n\n httpRequest.open('GET', requestPath);\n\n httpRequest.onerror = () =>\n reject(\n new FlowUiInitializationError(\n `Invalid server response when initializing Flow UI.\n ${httpRequest.status}\n ${httpRequest.responseText}`\n )\n );\n\n httpRequest.onload = () => {\n const contentType = httpRequest.getResponseHeader('content-type');\n if (contentType && contentType.indexOf('application/json') !== -1) {\n resolve(JSON.parse(httpRequest.responseText));\n } else {\n httpRequest.onerror();\n }\n };\n httpRequest.send();\n });\n }\n\n // Create shared connection state store and connection indicator\n private addConnectionIndicator() {\n // add connection indicator to DOM\n ConnectionIndicator.create();\n\n // Listen to browser online/offline events and update the loading indicator accordingly.\n // Note: if flow-client is loaded, it instead handles the state transitions.\n $wnd.addEventListener('online', () => {\n if (!this.isFlowClientLoaded()) {\n // Send an HTTP HEAD request for sw.js to verify server reachability.\n // We do not expect sw.js to be cached, so the request goes to the\n // server rather than being served from local cache.\n // Require network-level failure to revert the state to CONNECTION_LOST\n // (HTTP error code is ok since it still verifies server's presence).\n $wnd.Vaadin.connectionState.state = ConnectionState.RECONNECTING;\n const http = new XMLHttpRequest();\n http.open('HEAD', 'sw.js');\n http.onload = () => {\n $wnd.Vaadin.connectionState.state = ConnectionState.CONNECTED;\n };\n http.onerror = () => {\n $wnd.Vaadin.connectionState.state = ConnectionState.CONNECTION_LOST;\n };\n // Postpone request to reduce potential net::ERR_INTERNET_DISCONNECTED\n // errors that sometimes occurs even if browser says it is online\n setTimeout(() => http.send(), 50);\n }\n });\n $wnd.addEventListener('offline', () => {\n if (!this.isFlowClientLoaded()) {\n $wnd.Vaadin.connectionState.state = ConnectionState.CONNECTION_LOST;\n }\n });\n }\n\n private async offlineStubAction() {\n const offlineStub = document.createElement('iframe') as HTMLRouterContainer;\n const offlineStubPath = './offline-stub.html';\n offlineStub.setAttribute('src', offlineStubPath);\n offlineStub.setAttribute('style', 'width: 100%; height: 100%; border: 0');\n this.response = undefined;\n\n let onlineListener: ConnectionStateChangeListener | undefined;\n const removeOfflineStubAndOnlineListener = () => {\n if (onlineListener !== undefined) {\n $wnd.Vaadin.connectionState.removeStateChangeListener(onlineListener);\n onlineListener = undefined;\n }\n };\n\n offlineStub.onBeforeEnter = (ctx, _cmds, router) => {\n onlineListener = () => {\n if ($wnd.Vaadin.connectionState.online) {\n removeOfflineStubAndOnlineListener();\n router.render(ctx, false);\n }\n };\n $wnd.Vaadin.connectionState.addStateChangeListener(onlineListener);\n };\n offlineStub.onBeforeLeave = (_ctx, _cmds, _router) => {\n removeOfflineStubAndOnlineListener();\n };\n return offlineStub;\n }\n\n private isFlowClientLoaded(): boolean {\n return this.response !== undefined;\n }\n}\n"]}