HTTPS redirect middleware for the Infrastructure package (#52)

Services/Website/Sources/App/Extensions/ConfigReader+Properties.swift

@@ -145,6 +145,20 @@ package extension ConfigReader {
         }
     }
 
+    /// The HTTPS redirect middleware configuration, built from the `https.trustForwardedProto` key and ``siteOrigin``.
+    ///
+    /// Off by default, so a deployment without a proxy in front never redirects on a header its clients could have written themselves. The redirects
+    /// point at ``siteOrigin`` — the same value the pages build their canonical URLs from, so the two cannot disagree.
+    var httpsRedirect: HTTPSRedirectMiddleware<AppRequestContext>.Configuration {
+        .init(
+            origin: siteOrigin,
+            trustForwardedProto: bool(
+                forKey: .HTTPS.trustForwardedProto,
+                default: false
+            )
+        )
+    }
+
     /// The minimum log level the application emits at, read from the `log.level` key.
     ///
     /// Falls back to `.info` when the key is unset or its value names no `Logger.Level` case.