feat: allow passing super headers as query (#156)

Author: dealloc

src/Helldivers-2-API/Metrics/ClientMetric.cs

@@ -71,4 +71,13 @@ public static string GetClientName(HttpContext context)
 
         return result;
     }
+
+    private static string? GetSuperClient(HttpContext context)
+    {
+        if (context.Request.Headers.TryGetValue(Constants.CLIENT_HEADER_NAME, out var superClient))
+            if (string.IsNullOrWhiteSpace(superClient) is false)
+                return superClient;
+
+        return context.Request.Query[Constants.CLIENT_HEADER_NAME.ToLowerInvariant()];
+    }
 }

src/Helldivers-2-API/Middlewares/RateLimitMiddleware.cs

@@ -62,8 +62,8 @@ private bool IsValidRequest(HttpContext context)
         if (options.Value.ValidateClients is false || context.Request.Path.StartsWithSegments("/metrics"))
             return true;
 
-        return context.Request.Headers.ContainsKey(Constants.CLIENT_HEADER_NAME)
-            && context.Request.Headers.ContainsKey(Constants.CONTACT_HEADER_NAME);
+        return HasSuperHeaderOrQuery(context, Constants.CLIENT_HEADER_NAME)
+            && HasSuperHeaderOrQuery(context, Constants.CONTACT_HEADER_NAME);
     }
 
     private RateLimiter GetRateLimiter(HttpContext http)
@@ -122,4 +122,12 @@ private async Task RejectRequest(HttpContext context)
 
         await writer.FlushAsync(context.RequestAborted);
     }
+
+    private bool HasSuperHeaderOrQuery(HttpContext context, string name)
+    {
+        if (context.Request.Headers.ContainsKey(name))
+            return true;
+
+        return context.Request.Query.ContainsKey(name.ToLowerInvariant());
+    }
 }