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feat: redirect www.essentialcsharp.com to apex domain #1109

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Merged
BenjaminMichaelis merged 2 commits into from
May 16, 2026
Merged

feat: redirect www.essentialcsharp.com to apex domain #1109

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5f422e0
feat: redirect www.essentialcsharp.com to apex domain
BenjaminMichaelis May 15, 2026
d053d3e
fix: harden www redirect against open redirect
BenjaminMichaelis May 16, 2026
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24 changes: 24 additions & 0 deletions EssentialCSharp.Web/Program.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -430,6 +430,17 @@ await context.HttpContext.Response.WriteAsync(
// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
SiteSettings siteSettings = app.Services.GetRequiredService<IOptions<SiteSettings>>().Value;
if (!Uri.TryCreate(siteSettings.BaseUrl, UriKind.Absolute, out Uri? configuredBaseUri))
{
throw new InvalidOperationException($"Invalid {SiteSettings.SectionName}:{nameof(SiteSettings.BaseUrl)} value: '{siteSettings.BaseUrl}'.");
}
string apexHost = configuredBaseUri.Host.StartsWith("www.", StringComparison.OrdinalIgnoreCase)
? configuredBaseUri.Host[4..]
: configuredBaseUri.Host;
string wwwHost = $"www.{apexHost}";
string redirectAuthority = new UriBuilder(configuredBaseUri) { Host = apexHost }.Uri.GetLeftPart(UriPartial.Authority);

app.UseExceptionHandler(exceptionApp =>
{
exceptionApp.Run(async context =>
Expand Down Expand Up @@ -493,6 +504,19 @@ await McpJsonRpcResponseWriter.WriteErrorAsync(
app.UseSecurityHeadersMiddleware(new SecurityHeadersBuilder()
.AddDefaultSecurePolicy()
.AddContentSecurityPolicy(csp));

// Redirect configured www host to configured apex host (permanent 301).
// Must be after UseForwardedHeaders so the Host header reflects the real hostname.
app.Use(async (context, next) =>
{
if (string.Equals(context.Request.Host.Host, wwwHost, StringComparison.OrdinalIgnoreCase))
{
string redirectUrl = $"{redirectAuthority}{context.Request.PathBase}{context.Request.Path}{context.Request.QueryString}";
context.Response.Redirect(redirectUrl, permanent: true);
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Fixed
return;
}
await next(context);
});
}
else
{
Expand Down
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