Security header setup for the Website service (#8)

This PR contains the work done to add a `SecurityHeadersMiddleware` middleware that stamps hardened security-related HTTP headers onto every response.

To provide further details about the work:

* Implemented the `SecurityHeadersMiddleware` middleware, which precomputes headers once from a `Configuration` object and applies them to every response:
  * _Content-Security-Policy_,
  * _X-Content-Type-Options_,
  * _X-Frame-Options_,
  * _Referrer-Policy_,
  * _Permissions-Policy_,
  * _Strict-Transport-Security_ (optional).
* Integrated this middleware into the router (near the top of the chain), reading each value from configuration with hardened defaults.
* The _Strict-Transport-Security_ has no default value — omitted unless explicitly set, so it stays off in plain-HTTP during development and on only behind TLS.
* Added security-header constants keys and values.

Reviewed-on: rock-n-code/loud-amsterdam#8
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>
This commit is contained in:
2026-06-28 11:35:54 +00:00
committed by javier
parent 7c18cd9ec0
commit 6b6389cb0f
9 changed files with 497 additions and 31 deletions
@@ -4,6 +4,26 @@ extension String {
/// The directory, relative to the working directory, that the website's static files are served from.
public static let staticResources = "Resources/Static"
}
/// A namespace for the security headers' default configuration values.
///
/// `Strict-Transport-Security` is intentionally absent: it is only safe over HTTPS and is
/// "sticky" in browsers, so it stays off unless explicitly configured in production.
public enum Security {
/// The default `Content-Security-Policy`.
///
/// Restricts every resource to the site's own origin. `style-src` additionally allows
/// `'unsafe-inline'` because ``ErrorPage`` ships an inline `<style>` block; remove it once
/// the error page's styles move to an external stylesheet.
public static let contentSecurityPolicy = "default-src 'self'; style-src 'self' 'unsafe-inline'; object-src 'none'; base-uri 'self'; frame-ancestors 'none'"
/// The default `X-Content-Type-Options` (disables MIME sniffing).
public static let contentTypeOptions = "nosniff"
/// The default `X-Frame-Options` (forbids framing the page).
public static let frameOptions = "DENY"
/// The default `Referrer-Policy`.
public static let referrerPolicy = "strict-origin-when-cross-origin"
/// The default `Permissions-Policy` (denies access to powerful browser features the site does not use).
public static let permissionsPolicy = "accelerometer=(), camera=(), geolocation=(), gyroscope=(), magnetometer=(), microphone=(), payment=(), usb=()"
}
/// A namespace for the server string constants.
public enum Server {
/// The website server's name.