diff --git a/src/Components/Components/src/NavigationManager.cs b/src/Components/Components/src/NavigationManager.cs index e5752e669a38..534f0593eb07 100644 --- a/src/Components/Components/src/NavigationManager.cs +++ b/src/Components/Components/src/NavigationManager.cs @@ -2,6 +2,9 @@ // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information. using System; +using System.Collections.Generic; +using System.Linq; +using System.Threading.Tasks; using Microsoft.AspNetCore.Components.Routing; namespace Microsoft.AspNetCore.Components @@ -30,6 +33,11 @@ public event EventHandler LocationChanged private EventHandler? _locationChanged; + private readonly IList _locationChangingListeners = new List(); + + + private bool _hasLocationChangingEventHandlers; + // For the baseUri it's worth storing as a System.Uri so we can do operations // on that type. System.Uri gives us access to the original string anyway. private Uri? _baseUri; @@ -211,6 +219,90 @@ protected void NotifyLocationChanged(bool isInterceptedLink) } } + /// + /// Calls all registered handlers, to see if navigation should be canceled. + /// Returns true if navigation should be canceled. + /// + protected async ValueTask NotifyLocationChanging(string uri, bool isInterceptedLink, bool forceLoad) + { + try + { + if (_locationChangingListeners.Count > 0) + { + var context = new LocationChangingContext(uri, isInterceptedLink, forceLoad); + //Copy List to local array, to prevent exception when user removes handler during execution + foreach (var listener in _locationChangingListeners.ToArray()) + { + if (await listener.OnLocationChanging(context)) + { + return true; + } + } + } + return false; + } + catch (Exception ex) + { + throw new LocationChangeException("An exception occurred while dispatching a location changing event.", ex); + } + } + + /// + /// Called when the fact that any event handlers are present or not changes. + /// this can be used by descendants to inform the JSRuntime that there are locationchanging event handlers + /// + /// true if there are event handlers + /// true when the navigation subsystem could be informed that we have event handlers + protected virtual bool SetHasLocationChangingEventHandlers(bool value) + { + return true; + } + + /// + /// Calls when needed + /// This function is normally called when event handlers are added or removed from + /// + protected void UpdateHasLocationChangingEventHandlers() + { + var value = _locationChangingListeners.Any(); + if (_hasLocationChangingEventHandlers != value) + { + //If SetHasLocationChangingEventHandlers returns false, we won't update the _hasLocationChangingEventHandlers. + //This way we can call this function again at a later time (for example when JSRuntime is initialized, See RemoteNavigationManager) + if (SetHasLocationChangingEventHandlers(value)) + { + _hasLocationChangingEventHandlers = value; + } + } + } + + /// + /// Will add a handler to be called during a navigation Location change + /// + /// handler to be added. + public void AddLocationChangingHandler(IHandleLocationChanging locationChangingHandler) + { + AssertInitialized(); + _locationChangingListeners.Add(locationChangingHandler); + UpdateHasLocationChangingEventHandlers(); + } + + /// + /// Will remove a handler that was previously added by . + /// + /// handler to be removed. + /// + public bool RemoveLocationChangingHandler(IHandleLocationChanging locationChangingHandler) + { + AssertInitialized(); + var isRemoved = _locationChangingListeners.Remove(locationChangingHandler); + if (isRemoved) + { + UpdateHasLocationChangingEventHandlers(); + } + return isRemoved; + } + private void AssertInitialized() { if (!_isInitialized) diff --git a/src/Components/Components/src/PublicAPI.Unshipped.txt b/src/Components/Components/src/PublicAPI.Unshipped.txt index d111d01e1e42..664fd10de6f5 100644 --- a/src/Components/Components/src/PublicAPI.Unshipped.txt +++ b/src/Components/Components/src/PublicAPI.Unshipped.txt @@ -1,4 +1,4 @@ -#nullable enable +#nullable enable Microsoft.AspNetCore.Components.BindConverter Microsoft.AspNetCore.Components.BindElementAttribute Microsoft.AspNetCore.Components.BindElementAttribute.BindElementAttribute(string! element, string? suffix, string! valueAttribute, string! changeAttribute) -> void @@ -115,6 +115,7 @@ Microsoft.AspNetCore.Components.NavigationException Microsoft.AspNetCore.Components.NavigationException.Location.get -> string! Microsoft.AspNetCore.Components.NavigationException.NavigationException(string! uri) -> void Microsoft.AspNetCore.Components.NavigationManager +Microsoft.AspNetCore.Components.NavigationManager.AddLocationChangingHandler(Microsoft.AspNetCore.Components.Routing.IHandleLocationChanging! locationChangingHandler) -> void Microsoft.AspNetCore.Components.NavigationManager.BaseUri.get -> string! Microsoft.AspNetCore.Components.NavigationManager.BaseUri.set -> void Microsoft.AspNetCore.Components.NavigationManager.Initialize(string! baseUri, string! uri) -> void @@ -122,8 +123,11 @@ Microsoft.AspNetCore.Components.NavigationManager.LocationChanged -> System.Even Microsoft.AspNetCore.Components.NavigationManager.NavigateTo(string! uri, bool forceLoad = false) -> void Microsoft.AspNetCore.Components.NavigationManager.NavigationManager() -> void Microsoft.AspNetCore.Components.NavigationManager.NotifyLocationChanged(bool isInterceptedLink) -> void +Microsoft.AspNetCore.Components.NavigationManager.NotifyLocationChanging(string! uri, bool isInterceptedLink, bool forceLoad) -> System.Threading.Tasks.ValueTask +Microsoft.AspNetCore.Components.NavigationManager.RemoveLocationChangingHandler(Microsoft.AspNetCore.Components.Routing.IHandleLocationChanging! locationChangingHandler) -> bool Microsoft.AspNetCore.Components.NavigationManager.ToAbsoluteUri(string! relativeUri) -> System.Uri! Microsoft.AspNetCore.Components.NavigationManager.ToBaseRelativePath(string! uri) -> string! +Microsoft.AspNetCore.Components.NavigationManager.UpdateHasLocationChangingEventHandlers() -> void Microsoft.AspNetCore.Components.NavigationManager.Uri.get -> string! Microsoft.AspNetCore.Components.NavigationManager.Uri.set -> void Microsoft.AspNetCore.Components.OwningComponentBase @@ -266,6 +270,8 @@ Microsoft.AspNetCore.Components.RouteView.RouteData.get -> Microsoft.AspNetCore. Microsoft.AspNetCore.Components.RouteView.RouteData.set -> void Microsoft.AspNetCore.Components.RouteView.RouteView() -> void Microsoft.AspNetCore.Components.RouteView.SetParametersAsync(Microsoft.AspNetCore.Components.ParameterView parameters) -> System.Threading.Tasks.Task! +Microsoft.AspNetCore.Components.Routing.IHandleLocationChanging +Microsoft.AspNetCore.Components.Routing.IHandleLocationChanging.OnLocationChanging(Microsoft.AspNetCore.Components.Routing.LocationChangingContext! context) -> System.Threading.Tasks.ValueTask Microsoft.AspNetCore.Components.Routing.IHostEnvironmentNavigationManager Microsoft.AspNetCore.Components.Routing.IHostEnvironmentNavigationManager.Initialize(string! baseUri, string! uri) -> void Microsoft.AspNetCore.Components.Routing.INavigationInterception @@ -274,6 +280,11 @@ Microsoft.AspNetCore.Components.Routing.LocationChangedEventArgs Microsoft.AspNetCore.Components.Routing.LocationChangedEventArgs.IsNavigationIntercepted.get -> bool Microsoft.AspNetCore.Components.Routing.LocationChangedEventArgs.Location.get -> string! Microsoft.AspNetCore.Components.Routing.LocationChangedEventArgs.LocationChangedEventArgs(string! location, bool isNavigationIntercepted) -> void +Microsoft.AspNetCore.Components.Routing.LocationChangingContext +Microsoft.AspNetCore.Components.Routing.LocationChangingContext.ForceLoad.get -> bool +Microsoft.AspNetCore.Components.Routing.LocationChangingContext.IsNavigationIntercepted.get -> bool +Microsoft.AspNetCore.Components.Routing.LocationChangingContext.Location.get -> string! +Microsoft.AspNetCore.Components.Routing.LocationChangingContext.LocationChangingContext(string! location, bool isNavigationIntercepted, bool forceLoad) -> void Microsoft.AspNetCore.Components.Routing.NavigationContext Microsoft.AspNetCore.Components.Routing.NavigationContext.CancellationToken.get -> System.Threading.CancellationToken Microsoft.AspNetCore.Components.Routing.NavigationContext.Path.get -> string! @@ -410,6 +421,7 @@ virtual Microsoft.AspNetCore.Components.ComponentBase.OnParametersSetAsync() -> virtual Microsoft.AspNetCore.Components.ComponentBase.SetParametersAsync(Microsoft.AspNetCore.Components.ParameterView parameters) -> System.Threading.Tasks.Task! virtual Microsoft.AspNetCore.Components.ComponentBase.ShouldRender() -> bool virtual Microsoft.AspNetCore.Components.NavigationManager.EnsureInitialized() -> void +virtual Microsoft.AspNetCore.Components.NavigationManager.SetHasLocationChangingEventHandlers(bool value) -> bool virtual Microsoft.AspNetCore.Components.OwningComponentBase.Dispose(bool disposing) -> void virtual Microsoft.AspNetCore.Components.RenderTree.Renderer.DispatchEventAsync(ulong eventHandlerId, Microsoft.AspNetCore.Components.RenderTree.EventFieldInfo! fieldInfo, System.EventArgs! eventArgs) -> System.Threading.Tasks.Task! virtual Microsoft.AspNetCore.Components.RenderTree.Renderer.Dispose(bool disposing) -> void diff --git a/src/Components/Components/src/Routing/IHandleLocationChanging.cs b/src/Components/Components/src/Routing/IHandleLocationChanging.cs new file mode 100644 index 000000000000..2aec2778ed35 --- /dev/null +++ b/src/Components/Components/src/Routing/IHandleLocationChanging.cs @@ -0,0 +1,20 @@ +// Copyright (c) .NET Foundation. All rights reserved. +// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information. + +using System.Threading.Tasks; + +namespace Microsoft.AspNetCore.Components.Routing +{ + /// + /// Interface implemented by objects that want to react to a Location change in + /// + public interface IHandleLocationChanging + { + /// + /// This function is called whenever the wants to change it's Location + /// + /// + /// A whose result is a boolean, which if true will cancel the current Location change + ValueTask OnLocationChanging(LocationChangingContext context); + } +} diff --git a/src/Components/Components/src/Routing/LocationChangingContext.cs b/src/Components/Components/src/Routing/LocationChangingContext.cs new file mode 100644 index 000000000000..72abbee0d515 --- /dev/null +++ b/src/Components/Components/src/Routing/LocationChangingContext.cs @@ -0,0 +1,40 @@ +// Copyright (c) .NET Foundation. All rights reserved. +// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information. + +namespace Microsoft.AspNetCore.Components.Routing +{ + + /// + /// context used by to see what kind of navigation is occuring. + /// + public class LocationChangingContext + { + /// + /// Initializes a new instance of . + /// + /// The location. + /// A value that determines if navigation for the link was intercepted. + /// A value that shows if the forceLoad flag was set during a call to + public LocationChangingContext(string location, bool isNavigationIntercepted, bool forceLoad) + { + Location = location; + IsNavigationIntercepted = isNavigationIntercepted; + ForceLoad = forceLoad; + } + + /// + /// Gets the location we are about to change to. + /// + public string Location { get; } + + /// + /// Gets a value that determines if navigation for the link was intercepted. + /// + public bool IsNavigationIntercepted { get; } + + /// + /// Gets a value if the Forceload flag was set during a call to + /// + public bool ForceLoad { get; } + } +} diff --git a/src/Components/Server/src/Circuits/CircuitHost.cs b/src/Components/Server/src/Circuits/CircuitHost.cs index 91222e9513cd..90335a75b49f 100644 --- a/src/Components/Server/src/Circuits/CircuitHost.cs +++ b/src/Components/Server/src/Circuits/CircuitHost.cs @@ -475,6 +475,48 @@ await Renderer.Dispatcher.InvokeAsync(() => } } + public async Task OnLocationChangingAsync(string uri, bool intercepted) + { + AssertInitialized(); + AssertNotDisposed(); + + var cancel = false; + + try + { + cancel = await Renderer.Dispatcher.InvokeAsync( async () => + { + Log.LocationChanging(_logger, uri, CircuitId); + var navigationManager = (RemoteNavigationManager)Services.GetRequiredService(); + return await navigationManager.HandleLocationChanging(uri, intercepted, false); + }); + } + + // In either case, a well-behaved client will not send invalid URIs, and we don't really + // want to continue processing with the circuit if setting the URI failed inside application + // code. The safest thing to do is consider it a critical failure since URI is global state, + // and a failure means that an update to global state was partially applied. + catch (LocationChangeException nex) + { + // LocationChangeException means that it failed in user-code. Treat this like an unhandled + // exception in user-code. + Log.LocationChangeFailedInCircuit(_logger, uri, CircuitId, nex); + await TryNotifyClientErrorAsync(Client, GetClientErrorMessage(nex, "Location changing failed.")); + UnhandledException?.Invoke(this, new UnhandledExceptionEventArgs(nex, isTerminating: false)); + } + catch (Exception ex) + { + // Any other exception means that it failed inside the NavigationManager. Treat + // this like bad data. + Log.LocationChangeFailed(_logger, uri, CircuitId, ex); + await TryNotifyClientErrorAsync(Client, GetClientErrorMessage(ex, $"Location changing to '{uri}' failed.")); + UnhandledException?.Invoke(this, new UnhandledExceptionEventArgs(ex, isTerminating: false)); + } + return cancel; + } + + + public void SetCircuitUser(ClaimsPrincipal user) { // This can be called before the circuit is initialized. @@ -610,6 +652,7 @@ private static class Log private static readonly Action _locationChangeFailed; private static readonly Action _locationChangeFailedInCircuit; private static readonly Action _onRenderCompletedFailed; + private static readonly Action _locationChanging; private static class EventIds { @@ -645,6 +688,7 @@ private static class EventIds public static readonly EventId LocationChangeFailed = new EventId(210, "LocationChangeFailed"); public static readonly EventId LocationChangeFailedInCircuit = new EventId(211, "LocationChangeFailedInCircuit"); public static readonly EventId OnRenderCompletedFailed = new EventId(212, "OnRenderCompletedFailed"); + public static readonly EventId LocationChanging = new EventId(213, "LocationChanging"); } static Log() @@ -798,6 +842,11 @@ static Log() LogLevel.Debug, EventIds.OnRenderCompletedFailed, "Failed to complete render batch '{RenderId}' in circuit host '{CircuitId}'."); + + _locationChanging = LoggerMessage.Define( + LogLevel.Debug, + EventIds.LocationChanging, + "Location is about to change to {URI} in circuit '{CircuitId}'."); } public static void InitializationStarted(ILogger logger) => _initializationStarted(logger, null); @@ -853,6 +902,7 @@ public static void BeginInvokeDotNetFailed(ILogger logger, string callId, string } } + public static void LocationChanging(ILogger logger, string uri, CircuitId circuitId) => _locationChanging(logger, uri, circuitId, null); public static void LocationChange(ILogger logger, string uri, CircuitId circuitId) => _locationChange(logger, uri, circuitId, null); public static void LocationChangeSucceeded(ILogger logger, string uri, CircuitId circuitId) => _locationChangeSucceeded(logger, uri, circuitId, null); public static void LocationChangeFailed(ILogger logger, string uri, CircuitId circuitId, Exception exception) => _locationChangeFailed(logger, uri, circuitId, exception); diff --git a/src/Components/Server/src/Circuits/RemoteNavigationManager.cs b/src/Components/Server/src/Circuits/RemoteNavigationManager.cs index b57130c29a30..089cd0084a27 100644 --- a/src/Components/Server/src/Circuits/RemoteNavigationManager.cs +++ b/src/Components/Server/src/Circuits/RemoteNavigationManager.cs @@ -2,6 +2,7 @@ // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information. using System; +using System.Threading.Tasks; using Microsoft.AspNetCore.Components.Routing; using Microsoft.Extensions.Logging; using Microsoft.JSInterop; @@ -52,8 +53,8 @@ public void AttachJsRuntime(IJSRuntime jsRuntime) { throw new InvalidOperationException("JavaScript runtime already initialized."); } - _jsRuntime = jsRuntime; + UpdateHasLocationChangingEventHandlers(); } public void NotifyLocationChanged(string uri, bool intercepted) @@ -64,9 +65,19 @@ public void NotifyLocationChanged(string uri, bool intercepted) NotifyLocationChanged(intercepted); } + public ValueTask HandleLocationChanging(string uri, bool intercepted, bool forceLoad) + { + return NotifyLocationChanging(uri, intercepted, forceLoad); + } + /// - protected override void NavigateToCore(string uri, bool forceLoad) + protected override async void NavigateToCore(string uri, bool forceLoad) { + if (uri == null) + { + throw new ArgumentNullException(nameof(uri)); + } + Log.RequestingNavigation(_logger, uri, forceLoad); if (_jsRuntime == null) @@ -75,7 +86,23 @@ protected override void NavigateToCore(string uri, bool forceLoad) throw new NavigationException(absoluteUriString); } - _jsRuntime.InvokeAsync(Interop.NavigateTo, uri, forceLoad); + + //In serverside blazor we call the locationChanging handlers here to avoid an extra browser / server roundtrip + if (!await NotifyLocationChanging(uri, false, forceLoad)) + { + await _jsRuntime.InvokeAsync(Interop.NavigateTo, uri, forceLoad); + } + else + { + Log.NavigationCanceled(_logger, uri); + } + } + + /// + protected override bool SetHasLocationChangingEventHandlers(bool value) + { + _jsRuntime?.InvokeAsync(Interop.SetHasLocationChangingListeners, value); + return _jsRuntime != null; } private static class Log @@ -86,6 +113,9 @@ private static class Log private static readonly Action _receivedLocationChangedNotification = LoggerMessage.Define(LogLevel.Debug, new EventId(2, "ReceivedLocationChangedNotification"), "Received notification that the URI has changed to {Uri} with isIntercepted={IsIntercepted}"); + private static readonly Action _navigationCanceled = + LoggerMessage.Define(LogLevel.Debug, new EventId(3, "NavigationCanceled"), "Navigation to URI {Uri} canceled"); + public static void RequestingNavigation(ILogger logger, string uri, bool forceLoad) { _requestingNavigation(logger, uri, forceLoad, null); @@ -95,6 +125,11 @@ public static void ReceivedLocationChangedNotification(ILogger logger, string ur { _receivedLocationChangedNotification(logger, uri, isIntercepted, null); } + + public static void NavigationCanceled(ILogger logger, string uri) + { + _navigationCanceled(logger, uri, null); + } } } } diff --git a/src/Components/Server/src/ComponentHub.cs b/src/Components/Server/src/ComponentHub.cs index 389a97ab0341..114fada9b90d 100644 --- a/src/Components/Server/src/ComponentHub.cs +++ b/src/Components/Server/src/ComponentHub.cs @@ -234,6 +234,16 @@ public async ValueTask OnLocationChanged(string uri, bool intercepted) _ = circuitHost.OnLocationChangedAsync(uri, intercepted); } + public async ValueTask OnLocationChanging(string uri, bool intercepted) + { + var circuitHost = await GetActiveCircuitAsync(); + if (circuitHost == null) + { + return false; + } + return await circuitHost.OnLocationChangingAsync(uri, intercepted); + } + // We store the CircuitHost through a *handle* here because Context.Items is tied to the lifetime // of the connection. It's possible that a misbehaving client could cause disposal of a CircuitHost // but keep a connection open indefinitely, preventing GC of the Circuit and related application state. diff --git a/src/Components/Shared/src/BrowserNavigationManagerInterop.cs b/src/Components/Shared/src/BrowserNavigationManagerInterop.cs index ea3e4ec4318c..6aa0ca619fce 100644 --- a/src/Components/Shared/src/BrowserNavigationManagerInterop.cs +++ b/src/Components/Shared/src/BrowserNavigationManagerInterop.cs @@ -15,5 +15,7 @@ internal static class BrowserNavigationManagerInterop public static readonly string GetBaseUri = Prefix + "getUnmarshalledBaseURI"; public static readonly string NavigateTo = Prefix + "navigateTo"; + + public static readonly string SetHasLocationChangingListeners = Prefix + "setHasLocationChangingListeners"; } } diff --git a/src/Components/Web.JS/dist/Release/blazor.server.js b/src/Components/Web.JS/dist/Release/blazor.server.js index 5d6c00e06a2e..0e716248b8a1 100644 --- a/src/Components/Web.JS/dist/Release/blazor.server.js +++ b/src/Components/Web.JS/dist/Release/blazor.server.js @@ -1,11 +1,11 @@ -!function(e){var t={};function n(r){if(t[r])return t[r].exports;var o=t[r]={i:r,l:!1,exports:{}};return e[r].call(o.exports,o,o.exports,n),o.l=!0,o.exports}n.m=e,n.c=t,n.d=function(e,t,r){n.o(e,t)||Object.defineProperty(e,t,{enumerable:!0,get:r})},n.r=function(e){"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(e,"__esModule",{value:!0})},n.t=function(e,t){if(1&t&&(e=n(e)),8&t)return e;if(4&t&&"object"==typeof e&&e&&e.__esModule)return e;var r=Object.create(null);if(n.r(r),Object.defineProperty(r,"default",{enumerable:!0,value:e}),2&t&&"string"!=typeof e)for(var o in e)n.d(r,o,function(t){return e[t]}.bind(null,o));return r},n.n=function(e){var t=e&&e.__esModule?function(){return e.default}:function(){return e};return n.d(t,"a",t),t},n.o=function(e,t){return Object.prototype.hasOwnProperty.call(e,t)},n.p="",n(n.s=53)}([function(e,t,n){"use strict";var r;n.d(t,"a",(function(){return r})),function(e){e[e.Trace=0]="Trace",e[e.Debug=1]="Debug",e[e.Information=2]="Information",e[e.Warning=3]="Warning",e[e.Error=4]="Error",e[e.Critical=5]="Critical",e[e.None=6]="None"}(r||(r={}))},function(e,t,n){"use strict";(function(e){n.d(t,"e",(function(){return c})),n.d(t,"a",(function(){return u})),n.d(t,"c",(function(){return l})),n.d(t,"g",(function(){return f})),n.d(t,"i",(function(){return h})),n.d(t,"j",(function(){return p})),n.d(t,"f",(function(){return d})),n.d(t,"d",(function(){return g})),n.d(t,"b",(function(){return y})),n.d(t,"h",(function(){return v}));var r=n(0),o=n(4),i=Object.assign||function(e){for(var t,n=1,r=arguments.length;n0&&o[o.length-1])||6!==i[0]&&2!==i[0])){a=0;continue}if(3===i[0]&&(!o||i[1]>o[0]&&i[1]-1&&this.subject.observers.splice(e,1),0===this.subject.observers.length&&this.subject.cancelCallback&&this.subject.cancelCallback().catch((function(e){}))},e}(),y=function(){function e(e){this.minimumLogLevel=e,this.outputConsole=console}return e.prototype.log=function(e,t){if(e>=this.minimumLogLevel)switch(e){case r.a.Critical:case r.a.Error:this.outputConsole.error("["+(new Date).toISOString()+"] "+r.a[e]+": "+t);break;case r.a.Warning:this.outputConsole.warn("["+(new Date).toISOString()+"] "+r.a[e]+": "+t);break;case r.a.Information:this.outputConsole.info("["+(new Date).toISOString()+"] "+r.a[e]+": "+t);break;default:this.outputConsole.log("["+(new Date).toISOString()+"] "+r.a[e]+": "+t)}},e}();function v(){var e="X-SignalR-User-Agent";return l.isNode&&(e="User-Agent"),[e,b(c,m(),E(),w())]}function b(e,t,n,r){var o="Microsoft SignalR/",i=e.split(".");return o+=i[0]+"."+i[1],o+=" ("+e+"; 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window['Blazor']._internal.navigationManager.getUnmarshalledBaseURI = () => BINDING.js_string_to_mono_string(getBaseUri()); window['Blazor']._internal.navigationManager.getUnmarshalledLocationHref = () => BINDING.js_string_to_mono_string(getLocationHref()); - window['Blazor']._internal.navigationManager.listenForNavigationEvents(async (uri: string, intercepted: boolean): Promise => { await DotNet.invokeMethodAsync( 'Microsoft.AspNetCore.Components.WebAssembly', 'NotifyLocationChanged', uri, intercepted - ); - }); + ) + }, async (uri: string, intercepted: boolean): Promise => { + return await DotNet.invokeMethodAsync( + 'Microsoft.AspNetCore.Components.WebAssembly', + 'NotifyLocationChanging', + uri, + intercepted + )} +); // Get the custom environment setting if defined const environment = options?.environment; diff --git a/src/Components/Web.JS/src/Services/NavigationManager.ts b/src/Components/Web.JS/src/Services/NavigationManager.ts index 4311fe84926e..0626798eadfb 100644 --- a/src/Components/Web.JS/src/Services/NavigationManager.ts +++ b/src/Components/Web.JS/src/Services/NavigationManager.ts @@ -4,34 +4,45 @@ import { EventDelegator } from '../Rendering/EventDelegator'; let hasEnabledNavigationInterception = false; let hasRegisteredNavigationEventListeners = false; +let hasLocationChangingListeners = false; + +// Current uri +let currentUri =''; // Will be initialized once someone registers let notifyLocationChangedCallback: ((uri: string, intercepted: boolean) => Promise) | null = null; +let notifyLocationChangingCallback: ((uri: string, intercepted: boolean) => Promise) | null = null; // These are the functions we're making available for invocation from .NET export const internalFunctions = { listenForNavigationEvents, enableNavigationInterception, + setHasLocationChangingListeners, navigateTo, getBaseURI: () => document.baseURI, getLocationHref: () => location.href, }; -function listenForNavigationEvents(callback: (uri: string, intercepted: boolean) => Promise) { - notifyLocationChangedCallback = callback; +function listenForNavigationEvents(locationChangedCallback: (uri: string, intercepted: boolean) => Promise, locationChangingCallback: (uri: string, intercepted: boolean) => Promise) { + notifyLocationChangedCallback = locationChangedCallback; + notifyLocationChangingCallback = locationChangingCallback; if (hasRegisteredNavigationEventListeners) { return; } - + currentUri = location.href; hasRegisteredNavigationEventListeners = true; - window.addEventListener('popstate', () => notifyLocationChanged(false)); + window.addEventListener('popstate', ev => handleHistory(ev)); } function enableNavigationInterception() { hasEnabledNavigationInterception = true; } +function setHasLocationChangingListeners(hasListeners : boolean) { + hasLocationChangingListeners = hasListeners; +} + export function attachToEventDelegator(eventDelegator: EventDelegator) { // We need to respond to clicks on elements *after* the EventDelegator has finished // running its simulated bubbling process so that we can respect any preventDefault requests. @@ -63,10 +74,29 @@ export function attachToEventDelegator(eventDelegator: EventDelegator) { const href = anchorTarget.getAttribute(hrefAttributeName)!; const absoluteHref = toAbsoluteUri(href); + event.preventDefault(); + + //Setup local function as it can be called from 2 different code paths + const navigate = (uri : string) => { + if (isWithinBaseUriSpace(uri)) { + performInternalNavigation(uri, true); + } else { + location.href = uri; + } + } - if (isWithinBaseUriSpace(absoluteHref)) { - event.preventDefault(); - performInternalNavigation(absoluteHref, true); + //Path differs depending on if there are LocationChanging event handlers setup in the NavigationManager.cs class + //Presumably most of the time the LocationChanging event will not be set, so we try and avoid an extra client / server call every time a user navigates. + + if (!hasLocationChangingListeners) { + navigate(absoluteHref); + } else { + const changingPromise = handleLocationChanging(absoluteHref, true); + changingPromise.then( cancel => { + if (!cancel) { + navigate(absoluteHref); + } + }); } } }); @@ -85,7 +115,7 @@ export function navigateTo(uri: string, forceLoad: boolean, replace: boolean = f const temporaryUri = uri + '?'; history.replaceState(null, '', temporaryUri); location.replace(uri); - } else if (replace){ + } else if (replace) { history.replaceState(null, '', absoluteUri) } else { // It's either an external URL, or forceLoad is requested, so do a full page load @@ -97,24 +127,53 @@ function performInternalNavigation(absoluteInternalHref: string, interceptedLink // Since this was *not* triggered by a back/forward gesture (that goes through a different // code path starting with a popstate event), we don't want to preserve the current scroll // position, so reset it. - // To avoid ugly flickering effects, we don't want to change the scroll position until the + // To avoid ugly flickering effects, we don't want to change the scroll position until // we render the new page. As a best approximation, wait until the next batch. resetScrollAfterNextBatch(); - if(!replace){ + if (!replace) { history.pushState(null, /* ignored title */ '', absoluteInternalHref); - }else{ + } else { history.replaceState(null, /* ignored title */ '', absoluteInternalHref); } notifyLocationChanged(interceptedLink); } +async function handleHistory(event: PopStateEvent) +{ + if (!hasLocationChangingListeners) { + //No LocationChanged listeners setup in server, so avoid call to server + await notifyLocationChanged(false); + return; + } + + const absoluteHref = location.href; + const changingPromise = handleLocationChanging(absoluteHref, true); + changingPromise.then( cancel => { + if (!cancel) { + notifyLocationChanged(false); + } else { + //currentUri will point to the location before the popstate event + //Unfortunatly pushing the state will remove all forward history, but pushing is neccesary to revert to the situation before the popstate + history.pushState(null, '', currentUri); + } + }); +} + async function notifyLocationChanged(interceptedLink: boolean) { + currentUri = location.href; if (notifyLocationChangedCallback) { await notifyLocationChangedCallback(location.href, interceptedLink); } } +async function handleLocationChanging(absoluteUri : string, interceptedLink: boolean) { + if (notifyLocationChangingCallback) { + return notifyLocationChangingCallback(absoluteUri, interceptedLink); + } + return Promise.resolve(false); +} + let testAnchor: HTMLAnchorElement; export function toAbsoluteUri(relativeUri: string) { testAnchor = testAnchor || document.createElement('a'); @@ -141,4 +200,4 @@ function toBaseUriWithTrailingSlash(baseUri: string) { function eventHasSpecialKey(event: MouseEvent) { return event.ctrlKey || event.shiftKey || event.altKey || event.metaKey; -} \ No newline at end of file +} diff --git a/src/Components/WebAssembly/WebAssembly/src/Infrastructure/JSInteropMethods.cs b/src/Components/WebAssembly/WebAssembly/src/Infrastructure/JSInteropMethods.cs index e31f92e8707a..504e9f54aae3 100644 --- a/src/Components/WebAssembly/WebAssembly/src/Infrastructure/JSInteropMethods.cs +++ b/src/Components/WebAssembly/WebAssembly/src/Infrastructure/JSInteropMethods.cs @@ -27,6 +27,15 @@ public static void NotifyLocationChanged(string uri, bool isInterceptedLink) WebAssemblyNavigationManager.Instance.SetLocation(uri, isInterceptedLink); } + /// + /// For framework use only. + /// + [JSInvokable(nameof(NotifyLocationChanging))] + public static async Task NotifyLocationChanging(string uri, bool isInterceptedLink) + { + return await WebAssemblyNavigationManager.Instance.HandleLocationChanging(uri, isInterceptedLink, false); + } + /// /// For framework use only. /// diff --git a/src/Components/WebAssembly/WebAssembly/src/PublicAPI.Unshipped.txt b/src/Components/WebAssembly/WebAssembly/src/PublicAPI.Unshipped.txt index 831880cbcba2..0ac28c1b56a1 100644 --- a/src/Components/WebAssembly/WebAssembly/src/PublicAPI.Unshipped.txt +++ b/src/Components/WebAssembly/WebAssembly/src/PublicAPI.Unshipped.txt @@ -1,4 +1,4 @@ -#nullable enable +#nullable enable Microsoft.AspNetCore.Components.WebAssembly.Hosting.IWebAssemblyHostEnvironment Microsoft.AspNetCore.Components.WebAssembly.Hosting.RootComponentMapping Microsoft.AspNetCore.Components.WebAssembly.Hosting.RootComponentMapping.Parameters.get -> Microsoft.AspNetCore.Components.ParameterView @@ -72,3 +72,4 @@ Microsoft.AspNetCore.Components.WebAssembly.Services.LazyAssemblyLoader ~static Microsoft.AspNetCore.Components.WebAssembly.Http.WebAssemblyHttpRequestMessageExtensions.SetBrowserResponseStreamingEnabled(this System.Net.Http.HttpRequestMessage requestMessage, bool streamingEnabled) -> System.Net.Http.HttpRequestMessage ~static Microsoft.AspNetCore.Components.WebAssembly.Infrastructure.JSInteropMethods.DispatchEvent(Microsoft.AspNetCore.Components.RenderTree.WebEventDescriptor eventDescriptor, string eventArgsJson) -> System.Threading.Tasks.Task ~static Microsoft.AspNetCore.Components.WebAssembly.Infrastructure.JSInteropMethods.NotifyLocationChanged(string uri, bool isInterceptedLink) -> void +~static Microsoft.AspNetCore.Components.WebAssembly.Infrastructure.JSInteropMethods.NotifyLocationChanging(string uri, bool isInterceptedLink) -> System.Threading.Tasks.Task diff --git a/src/Components/WebAssembly/WebAssembly/src/Services/WebAssemblyNavigationManager.cs b/src/Components/WebAssembly/WebAssembly/src/Services/WebAssemblyNavigationManager.cs index 3fda8eaee861..64deeb88ffeb 100644 --- a/src/Components/WebAssembly/WebAssembly/src/Services/WebAssemblyNavigationManager.cs +++ b/src/Components/WebAssembly/WebAssembly/src/Services/WebAssemblyNavigationManager.cs @@ -2,7 +2,7 @@ // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information. using System; -using Microsoft.AspNetCore.Components; +using System.Threading.Tasks; using Interop = Microsoft.AspNetCore.Components.Web.BrowserNavigationManagerInterop; namespace Microsoft.AspNetCore.Components.WebAssembly.Services @@ -28,15 +28,30 @@ public void SetLocation(string uri, bool isInterceptedLink) NotifyLocationChanged(isInterceptedLink); } + public ValueTask HandleLocationChanging(string uri, bool isInterceptedLink, bool forceLoad) + { + return NotifyLocationChanging(uri , isInterceptedLink, forceLoad); + } + /// - protected override void NavigateToCore(string uri, bool forceLoad) + protected override async void NavigateToCore(string uri, bool forceLoad) { if (uri == null) { throw new ArgumentNullException(nameof(uri)); } - DefaultWebAssemblyJSRuntime.Instance.Invoke(Interop.NavigateTo, uri, forceLoad); + if (!await NotifyLocationChanging(uri, false, forceLoad)) + { + DefaultWebAssemblyJSRuntime.Instance.Invoke(Interop.NavigateTo, uri, forceLoad); + } + } + + /// + protected override bool SetHasLocationChangingEventHandlers(bool value) + { + DefaultWebAssemblyJSRuntime.Instance.Invoke(Interop.SetHasLocationChangingListeners, value); + return true; } } } diff --git a/src/Components/test/E2ETest/Tests/RoutingTest.cs b/src/Components/test/E2ETest/Tests/RoutingTest.cs index 358bede758c0..da6243120608 100644 --- a/src/Components/test/E2ETest/Tests/RoutingTest.cs +++ b/src/Components/test/E2ETest/Tests/RoutingTest.cs @@ -433,6 +433,70 @@ public void UriHelperCanReadAbsoluteUriIncludingHash() Browser.Equal(expectedAbsoluteUri, () => app.FindElement(By.Id("test-info")).Text); } + [Fact] + public void CanCancelLocationChanging() + { + SetUrlViaPushState("/LocationChangingStart"); + var app = Browser.MountTestComponent(); + var initialUrl = Browser.Url; + Browser.Equal(initialUrl, () => app.FindElement(By.Id("test-info")).Text); + + //after we navigated to LocationChangingCancel + //sucessive navigation attempts will be canceled unless we allow them again + app.FindElement(By.Id("test-navigate")).Click(); + var uri = $"{_serverFixture.RootUri}subdir/LocationChangingCancel"; + Browser.Equal(uri, () => app.FindElement(By.Id("test-info")).Text); + + + //Attempt to navigate by using the back/forward button (or calling history/back / forward) should fail + var jsExecutor = (IJavaScriptExecutor)Browser; + jsExecutor.ExecuteScript("history.back()"); + Browser.Equal(uri, () => app.FindElement(By.Id("test-info")).Text); + + //Attempt to navigate with navigateto should fail + app.FindElement(By.Id("test-button")).Click(); + Browser.Equal(uri, () => app.FindElement(By.Id("test-info")).Text); + + //Attempt to navigate with clicking a link should fail + app.FindElement(By.Id("test-link")).Click(); + Browser.Equal(uri, () => app.FindElement(By.Id("test-info")).Text); + + //Attempt to navigate to an external site with navigateto should fail + app.FindElement(By.Id("test-button-gotoexternal")).Click(); + Browser.Equal(uri, () => app.FindElement(By.Id("test-info")).Text); + + //Attempt to navigate to an external site with clicking a link should fail + app.FindElement(By.Id("test-link-gotoexternal")).Click(); + Browser.Equal(uri, () => app.FindElement(By.Id("test-info")).Text); + + //Attempt to navigate to an invalid web page should fail + //As we are canceling the navigation before it will be picked up by the router, the user won't see an error here + app.FindElement(By.Id("test-button-gotoinvalid")).Click(); + Browser.Equal(uri, () => app.FindElement(By.Id("test-info")).Text); + + //Attempt to navigate with navigateto and forceload=true should fail + app.FindElement(By.Id("test-button-forceload")).Click(); + Browser.Equal(uri, () => app.FindElement(By.Id("test-info")).Text); + + //Attempt to navigate to an invalid web page with clicking a link should fail + app.FindElement(By.Id("test-link-gotoinvalid")).Click(); + Browser.Equal(uri, () => app.FindElement(By.Id("test-info")).Text); + + //Now we add an awaitable delay, see if navigation is still blocked + app.FindElement(By.Id("test-shoulddelay")).Click(); + + //Attempt to navigate with navigateto should fail (Even with await) + app.FindElement(By.Id("test-button")).Click(); + Browser.Equal(uri, () => app.FindElement(By.Id("test-info")).Text); + + //Enable navigation again + app.FindElement(By.Id("test-enable")).Click(); + + //We should be able to navigate again + jsExecutor.ExecuteScript("history.back()"); + Browser.Equal(initialUrl, () => app.FindElement(By.Id("test-info")).Text); + } + [Fact] public void CanArriveAtRouteWithExtension() { diff --git a/src/Components/test/testassets/BasicTestApp/RouterTest/LocationChangingCancel.razor b/src/Components/test/testassets/BasicTestApp/RouterTest/LocationChangingCancel.razor new file mode 100644 index 000000000000..1138ae91e3b4 --- /dev/null +++ b/src/Components/test/testassets/BasicTestApp/RouterTest/LocationChangingCancel.razor @@ -0,0 +1,59 @@ +@page "/LocationChangingCancel" + +@using Microsoft.JSInterop +@using Microsoft.AspNetCore.Components.Routing + +@inject IJSRuntime JSRuntime +@inject NavigationManager NavigationManager +@implements IDisposable +@implements IHandleLocationChanging + + + + + +Can We> +Can We go external> +Can We go invalid> + + + +@UrlLocation + + +Can@(cancel ? " Not" : "") Navigate + +@code{ + string UrlLocation; + bool shouldDelay = false; + bool cancel = true; + + protected override void OnInitialized() + { + UrlLocation = NavigationManager.Uri; + NavigationManager.LocationChanged += OnLocationChanged; + NavigationManager.AddLocationChangingHandler(this); + } + + void IDisposable.Dispose() + { + NavigationManager.RemoveLocationChangingHandler(this); + NavigationManager.LocationChanged -= OnLocationChanged; + } + + void OnLocationChanged(object sender, LocationChangedEventArgs e) + { + UrlLocation = NavigationManager.Uri; + StateHasChanged(); + } + + public async ValueTask OnLocationChanging(LocationChangingContext e) + { + if (shouldDelay) + { + await Task.Delay(1000); + } + return cancel; + } + +} diff --git a/src/Components/test/testassets/BasicTestApp/RouterTest/LocationChangingStart.razor b/src/Components/test/testassets/BasicTestApp/RouterTest/LocationChangingStart.razor new file mode 100644 index 000000000000..7df65262af22 --- /dev/null +++ b/src/Components/test/testassets/BasicTestApp/RouterTest/LocationChangingStart.razor @@ -0,0 +1,30 @@ +@page "/LocationChangingStart" +@using Microsoft.AspNetCore.Components.Routing + +@inject NavigationManager NavigationManager +@implements IDisposable + + + +@UrlLocation + +@code{ + string UrlLocation; + + protected override void OnInitialized() + { + UrlLocation = NavigationManager.Uri; + NavigationManager.LocationChanged += OnLocationChanged; + } + + void IDisposable.Dispose() + { + NavigationManager.LocationChanged -= OnLocationChanged; + } + + void OnLocationChanged(object sender, LocationChangedEventArgs e) + { + UrlLocation = NavigationManager.Uri; + StateHasChanged(); + } +}