appendix: 23 Code-Ausschnitte aus dem Houston-Repository

Pin nixpkgs to the revision used by itc.componentware: the channel version
ships a latexminted that crashes on Python 3.14, which made every listing
fail and sent latexmk into an endless error prompt. Also force
nonstopmode/halt-on-error so a broken listing can never loop again.

figures/code/auth-policy.cs

@@ -0,0 +1,25 @@
+// Houston/Auth/HoustonRoles.cs
+public static readonly string DocumentsView = "Documents.View";
+
+// Houston/Program.cs
+var viewDocumentsPolicy = "CanViewDocuments";
+
+builder.Services.AddAuthorization(o =>
+{
+    o.FallbackPolicy = new AuthorizationPolicyBuilder().RequireAuthenticatedUser().Build();
+    // ...
+    o.AddPolicy(viewDocumentsPolicy, policy => policy.RequireRole(HoustonRoles.DocumentsView));
+});
+
+builder.Services.AddRazorPages(o =>
+{
+    // ...
+    o.Conventions.AllowAnonymousToPage("/Document/Share");
+    o.Conventions.AuthorizeFolder("/Document", viewDocumentsPolicy);
+    o.Conventions.AuthorizePage("/Documents", viewDocumentsPolicy);
+});
+
+// Houston/Services registrations
+builder.Services.AddOptions<DocumentsSettings>().BindConfiguration("Documents");
+builder.Services.AddDocumentsClient();
+builder.Services.AddScoped<DocumentsService>();