Rename projects to FileShare

FileShare-Services/Core/ServiceRequestBinder.cs

@@ -0,0 +1,53 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace FileShare_Services.Core
+{
+    /// <summary>
+    /// Binds unified endpoint request models from JSON bodies or query parameters.
+    /// </summary>
+    internal static class ServiceRequestBinder
+    {
+        private static readonly JsonSerializerOptions JsonOptions = new(JsonSerializerDefaults.Web)
+        {
+            NumberHandling = JsonNumberHandling.AllowReadingFromString,
+        };
+
+        /// <summary>
+        /// Bind a JSON request body. Empty bodies are treated as an empty JSON object.
+        /// </summary>
+        public static T BindBody<T>(ServiceEndpointContext context)
+        {
+            var json = string.IsNullOrWhiteSpace(context.Body) ? "{}" : context.Body;
+            return Deserialize<T>(json, "body");
+        }
+
+        /// <summary>
+        /// Bind route and query parameters to a request DTO.
+        /// </summary>
+        public static T BindQuery<T>(ServiceEndpointContext context)
+        {
+            var values = new Dictionary<string, string>(context.Query, StringComparer.OrdinalIgnoreCase);
+            foreach (var routeValue in context.RouteValues)
+            {
+                values[routeValue.Key] = routeValue.Value;
+            }
+
+            var json = JsonSerializer.Serialize(values, JsonOptions);
+            return Deserialize<T>(json, "query");
+        }
+
+        private static T Deserialize<T>(string json, string source)
+        {
+            try
+            {
+                return JsonSerializer.Deserialize<T>(json, JsonOptions)
+                    ?? throw new ArgumentException($"Request {source} cannot be bound to {typeof(T).Name}.");
+            }
+            catch (JsonException ex)
+            {
+                throw new ArgumentException($"Request {source} cannot be bound to {typeof(T).Name}.", ex);
+            }
+        }
+    }
+}