Improved permissions and permission validation

Wave/Components/Pages/ArticleEditor.razor

@@ -3,9 +3,9 @@
 
 @using Wave.Data
 @using Microsoft.AspNetCore.Identity
+@using System.Security.Claims
 
-@rendermode InteractiveServer
-@attribute [Authorize(Policy = "ArticleEditOrReviewPermissions")]
+@rendermode @(new InteractiveServerRenderMode(false))
 
 @inject UserManager<ApplicationUser> UserManager
 @inject IStringLocalizer<ArticleEditor> Localizer
@@ -23,7 +23,7 @@
 		<ChildContent>
 			<h1 class="text-3xl lg:text-5xl font-light mb-6 text-primary">@Localizer["EditorTitle"]</h1>
 			
-			<Wave.Components.Pages.Partials.ArticleEditorPartial Id="@Id" User="@User" />
+			<Wave.Components.Pages.Partials.ArticleEditorPartial Id="@Id" User="@User" ClaimsUser="@ClaimsUser" />
 		</ChildContent>
 		<ErrorContent>
 			<h1 class="text-3xl lg:text-5xl font-light mb-6">Not found</h1>
@@ -41,10 +41,12 @@
 	[Parameter]
 	public Guid? Id { get; set; }
 	private ApplicationUser? User { get; set; }
+	private ClaimsPrincipal? ClaimsUser { get; set; }
 	
 	protected override async Task OnInitializedAsync() {
 		if (AuthenticationState is null) throw new ApplicationException("???");
 		var state = await AuthenticationState;
+		ClaimsUser = state.User;
 		var user = await UserManager.GetUserAsync(state.User);
 		User = user ?? throw new ApplicationException("???2");
 	}

Wave/Components/Pages/ArticleView.razor

@@ -3,9 +3,7 @@
 @using Microsoft.EntityFrameworkCore
 @using Wave.Data
 @using System.Security.Claims
-@using System.Diagnostics.CodeAnalysis
 @using System.Globalization
-@using System.Net
 @using Microsoft.AspNetCore.Identity
 @using Microsoft.Extensions.Options
 @using Wave.Services
@@ -54,25 +52,25 @@
 
 <ErrorBoundary>
 	<ChildContent>
-		<AuthorizeView Policy="ArticleEditOrReviewPermissions">
-			<Authorized>
-				<ArticleComponent Article="@GetArticleProtected(context.User)" />
+		@if (GetArticle(HttpContext.User) is {} article) {
+			<ArticleComponent Article="@article"/>
+			
 			<div class="flex gap-2 mt-3 flex-wrap">
-					@if (CanEdit) {
+				@if (article.AllowedToEdit(HttpContext.User)) {
 					<a class="btn btn-info w-full sm:btn-wide" href="article/@Article!.Id/edit"
 					   data-enhance-nav="false">@Localizer["Edit"]</a>
 				}
-					@if (Article.Status is ArticleStatus.Draft) {
+				@if (article.AllowedToSubmitForReview(HttpContext.User)) {
 					<form @formname="submit-for-review" method="post" @onsubmit="SubmitForReview" class="max-sm:w-full">
 						<AntiforgeryToken/>
 						<button type="submit" class="btn btn-primary w-full sm:btn-wide">@Localizer["Review_Submit"]</button>
 					</form>
 				}
-					@if (Article.Status is ArticleStatus.InReview || (Article.Status is ArticleStatus.Draft && context.User.IsInRole("Admin"))) {
+				@if (article.AllowedToPublish(HttpContext.User)) {
 					<form @formname="submit-for-publish" method="post" @onsubmit="SubmitForPublish" class="max-sm:w-full">
 						<AntiforgeryToken/>
 						<button type="submit" class="btn btn-primary w-full sm:btn-wide">@Localizer["Publish_Submit"]</button>
-							@if (Features.Value.EmailSubscriptions) {
+						@if (Features.Value.EmailSubscriptions && HttpContext.User.IsInRole("Admin")) {
 							<div class="form-control">
 								<label class="label cursor-pointer">
 									<span class="label-text">@Localizer["Publish_Silent_Label"]</span>
@@ -82,17 +80,13 @@
 						}
 					</form>
 				}
-					<AuthorizeView Policy="ArticleDeletePermissions" Context="_">
-						<a class="btn btn-error w-full sm:btn-wide" href="/article/@Article.Id/delete">
+				@if (article.AllowedToDelete(HttpContext.User)) {
+					<a class="btn btn-error w-full sm:btn-wide" href="/article/@article.Id/delete">
 						@Localizer["Delete_Submit"]
 					</a>
-					</AuthorizeView>
+				}
 			</div>
-			</Authorized>
-			<NotAuthorized>
-				<ArticleComponent Article="@GetArticlePublic()" />
-			</NotAuthorized>
-		</AuthorizeView>
+		}
 	</ChildContent>
 	<ErrorContent>
 		<h1 class="text-3xl lg:text-5xl font-light mb-6 text-primary">@Localizer["NotFound_Title"]</h1>
@@ -136,51 +130,10 @@
 	[CascadingParameter] 
 	public HttpContext HttpContext { get; set; } = default!;
 	
-	private bool CanEdit { get; set; }
+	private Article GetArticle(ClaimsPrincipal principal) {
+		if (Article.AllowedToRead(principal)) return Article!;
 	
-	private Article GetArticlePublic() {
-		if (Article is null) throw new ApplicationException("Article not found.");
-		if (Article.Status >= ArticleStatus.Published && Article.PublishDate <= DateTimeOffset.UtcNow) {
-			return Article;
-		}
-		throw new ApplicationException("Article is not public.");
-	}
-
-	[SuppressMessage("ReSharper", "ConvertIfStatementToSwitchStatement")]
-	private Article GetArticleProtected(ClaimsPrincipal principal) {
-		if (Article is null) throw new ApplicationException("Article not found.");
-
-		// The Article is publicly available
-		if (Article.Status >= ArticleStatus.Published && Article.PublishDate <= DateTimeOffset.UtcNow) {
-			if (principal.IsInRole("Admin"))
-				CanEdit = true;
-			return Article;
-		}
-
-		// Admins always get access
-		if (principal.IsInRole("Admin")) {
-			CanEdit = true;
-			return Article;
-		}
-		
-		// You can only access your own drafts
-		if (Article.Status is ArticleStatus.Draft) {
-			if (Article.Author.Id == principal.FindFirst("Id")!.Value) {
-				CanEdit = true;
-				return Article;
-			}
-			throw new ApplicationException("Cannot access draft article without being author or admin.");
-		}
-		// InReview Articles can only be accessed by reviewers
-		if (Article.Status is ArticleStatus.InReview) {
-			if (principal.IsInRole("Reviewer")) {
-				CanEdit = true;
-				return Article;
-			}
-			throw new ApplicationException("Cannot access in-review article without being a reviewer or admin.");
-		}
-
-		throw new ApplicationException("User does not have access to this article.");
+		throw new ApplicationException("Article not found or missing permissions.");
 	}
 
 	protected override void OnInitialized() {
@@ -207,10 +160,10 @@
 	}
 
 	private async Task SubmitForReview() {
-		if (Article is null) return;
+		if (Article.AllowedToSubmitForReview(HttpContext.User) is false) return;
 
 		await using var context = await ContextFactory.CreateDbContextAsync();
-		Article.Status = ArticleStatus.InReview;
+		Article!.Status = ArticleStatus.InReview;
 		context.Update(Article);
 		await context.SaveChangesAsync();
 		Message.ShowSuccess(Localizer["Submit_Review_Success"]);
@@ -224,6 +177,8 @@
 				await EmailService.ConnectAsync(CancellationToken.None);
 
 				foreach (var reviewer in reviewers) {
+					if (reviewer.Id == HttpContext.User.FindFirst("Id")!.Value) continue;
+
 					var email = await Email.CreateDefaultEmail(
 						reviewer.Email!, 
 						reviewer.Name, 
@@ -245,6 +200,8 @@
 	}
 
 	private async Task SubmitForPublish() {
+		if (Article.AllowedToPublish(HttpContext.User) is false) return;
+
 		await using var context = await ContextFactory.CreateDbContextAsync();
 		Article!.Status = ArticleStatus.Published;
 		string userId = HttpContext.User.FindFirst("Id")!.Value;
@@ -269,9 +226,11 @@
 		}
 
 		try {
-			await EmailService.ConnectAsync(CancellationToken.None);
 			var author = Article.Author;
 
+			if (author.Id != HttpContext.User.FindFirst("Id")!.Value) {
+				await EmailService.ConnectAsync(CancellationToken.None);
+
 				string publishMessage = 
 					(Article.PublishDate < DateTimeOffset.Now) ?
 						"Is is now publicly available." : 
@@ -290,6 +249,7 @@
 				await EmailService.SendEmailAsync(email);
 
 				await EmailService.DisconnectAsync(CancellationToken.None);
+			}
 		} catch (Exception ex) {
 			Logger.LogError(ex, "Failed to send mail to author about article '{title}' being published.", Article.Title);
 		}

Wave/Components/Pages/Partials/ArticleEditorPartial.razor

@@ -2,6 +2,7 @@
 @using System.ComponentModel.DataAnnotations
 @using System.Diagnostics.CodeAnalysis
 @using System.Net
+@using System.Security.Claims
 @using Microsoft.AspNetCore.Identity
 @using Microsoft.EntityFrameworkCore
 @using Wave.Services
@@ -231,6 +232,9 @@
     public Guid? Id { get; set; }
 	[Parameter] 
     public required ApplicationUser User { get; set; }
+	[Parameter]
+	public required ClaimsPrincipal ClaimsUser { get; set; }
+
 	[SupplyParameterFromForm] 
     private InputModel Model { get; set; } = new();
 	
@@ -261,11 +265,12 @@
 				.Include(a => a.Images)
 				.FirstAsync(a => a.Id == Id);
 			if (article is null) throw new ApplicationException("Article not found.");
-
-			await HandleRoles(article, User);
 		}
 
 		if (article is not null) {
+			if (!article.AllowedToEdit(ClaimsUser))
+				throw new ApplicationException("You are not allowed to edit this article");
+
 			Model.Id ??= article.Id;
 			Model.Title ??= article.Title;
 			Model.Slug ??= article.Slug;
@@ -278,6 +283,10 @@
 	}
 
 	private async Task OnValidSubmit() {
+		if (Article.AllowedToEdit(ClaimsUser) is false) {
+			Message.ShowError("Permission denied.");
+			return;
+		}
 		try {
 			Saving = true;
 			

Wave/Components/Routes.razor

@@ -5,6 +5,11 @@
 			<NotAuthorized>
 				<RedirectToLogin/>
 			</NotAuthorized>
+			<Authorizing>
+				<div class="flex place-content-center">
+					<span class="loading loading-spinner loading-lg"></span>
+				</div>
+			</Authorizing>
 		</AuthorizeRouteView>
 		<FocusOnNavigate RouteData="@routeData" Selector="h1"/>
 	</Found>

Wave/Utilities/Permissions.cs

@@ -0,0 +1,120 @@
+using System.Security.Claims;
+using Wave.Data;
+
+namespace Wave.Utilities;
+
+/// <summary>
+/// Central location for assessing if a user has access to an article, or may modify them in specific ways
+/// </summary>
+public static class Permissions {
+	public static bool AllowedToRead(this Article? article, ClaimsPrincipal principal) {
+		if (article is null || article.IsDeleted) return false;
+		
+		// The Article is publicly available
+		if (article.Status >= ArticleStatus.Published && article.PublishDate <= DateTimeOffset.UtcNow) {
+			return true;
+		}
+		
+		// Admins always get access
+		if (principal.IsInRole("Admin")) {
+			return true;
+		}
+		
+		// You can only access your own drafts
+		if (article.Status is ArticleStatus.Draft && article.Author.Id == principal.FindFirst("Id")!.Value) {
+			return true;
+		}
+
+		// Reviewers can see in-review articles
+		if (article.Status is ArticleStatus.InReview && principal.IsInRole("Reviewer")) {
+			return true;
+		}
+
+		return false;
+	}
+
+	public static bool AllowedToEdit(this Article? article, ClaimsPrincipal principal) {
+		if (article is null || article.IsDeleted) return false;
+
+		// Admins always can edit articles
+		if (principal.IsInRole("Admin")) {
+			return true;
+		}
+
+		// You can edit your own draft articles
+		if (article.Status is ArticleStatus.Draft && article.Author.Id == principal.FindFirst("Id")!.Value) {
+			return true;
+		}
+
+		// Reviewers can edit in-review articles
+		if (article.Status is ArticleStatus.InReview && principal.IsInRole("Reviewer")) {
+			return true;
+		}
+
+		// Moderators can edit published/-ing articles
+		if (article.Status is ArticleStatus.Published && principal.IsInRole("Moderator")) {
+			return true;
+		}
+
+		return false;
+	}
+
+	public static bool AllowedToSubmitForReview(this Article? article, ClaimsPrincipal principal) {
+		if (article is null || article.IsDeleted) return false;
+
+		// Draft articles can be submitted by their authors (admins can publish them anyway, no need to submit)
+		if (article.Status is ArticleStatus.Draft && article.Author.Id == principal.FindFirst("Id")!.Value) {
+			return true;
+		}
+
+		return false;
+	}
+
+	public static bool AllowedToPublish(this Article? article, ClaimsPrincipal principal) {
+		if (article is null || article.IsDeleted) return false;
+		
+		// Admins can skip review and directly publish draft articles
+		if (article.Status is ArticleStatus.Draft && principal.IsInRole("Admin")) {
+			return true;
+		}
+
+		// Admins may always review articles
+		if (article.Status is ArticleStatus.InReview && principal.IsInRole("Admin")) {
+			return true;
+		}
+
+		// Reviewers can review in-review articles, as long as they are not their own
+		if (article.Status is ArticleStatus.InReview && principal.IsInRole("Reviewer") &&
+		    article.Author.Id != principal.FindFirst("Id")!.Value) {
+			return true;
+		}
+
+		return false;
+	}
+
+	public static bool AllowedToDelete(this Article? article, ClaimsPrincipal principal) {
+		if (article is null || article.IsDeleted) return false;
+
+		// Admins can delete articles whenever
+		if (principal.IsInRole("Admin")) {
+			return true;
+		}
+
+		// You can delete your drafts
+		if (article.Status is ArticleStatus.Draft && article.Author.Id == principal.FindFirst("Id")!.Value) {
+			return true;
+		}
+		
+		// Reviewers can reject/delete in-review articles
+		if (article.Status is ArticleStatus.InReview && principal.IsInRole("Reviewer")) {
+			return true;
+		}
+
+		// Moderators can take down articles
+		if (article.Status is ArticleStatus.Published && principal.IsInRole("Moderator")) {
+			return true;
+		}
+
+		return false;
+	}
+}