Add BlazorWebView skeleton code (#62)

src/BlazorWebView/src/Maui/Tizen/WebViewExtension.cs

@@ -0,0 +1,69 @@
+using System;
+using System.Runtime.InteropServices;
+using TWebView = Tizen.WebView.WebView;
+
+namespace Microsoft.AspNetCore.Components.WebView.Maui
+{
+    public static class WebViewExtension
+    {
+        public const string ChromiumEwk = "libchromium-ewk.so";
+
+        public static void SetInterceptRequestCallback(this TWebView webView, InterceptRequestCallback callback)
+        {
+			var context = webView.GetContext();
+			var handleField = context.GetType().GetField("_handle", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
+            var contextHandle = (IntPtr?)handleField?.GetValue(context);
+			if (contextHandle != null)
+				ewk_context_intercept_request_callback_set(contextHandle.Value, callback, IntPtr.Zero);
+        }
+
+#pragma warning disable IDE0060 // Remove unused parameter
+        public static bool SetInterceptRequestResponse(this TWebView webView, IntPtr request, string header, string body, uint length)
+#pragma warning restore IDE0060 // Remove unused parameter
+        {
+            return ewk_intercept_request_response_set(request, header, body, length);
+        }
+
+#pragma warning disable IDE0060 // Remove unused parameter
+        public static bool IgnoreInterceptRequest(this TWebView webView, IntPtr request)
+#pragma warning restore IDE0060 // Remove unused parameter
+        {
+            return ewk_intercept_request_ignore(request);
+        }
+
+#pragma warning disable IDE0060 // Remove unused parameter
+		public static string GetInterceptRequestUrl(this TWebView webView, IntPtr request)
+#pragma warning restore IDE0060 // Remove unused parameter
+		{
+			return Marshal.PtrToStringAnsi(_ewk_intercept_request_url_get(request)) ?? string.Empty;
+        }
+
+        [DllImport(ChromiumEwk)]
+		internal static extern IntPtr ewk_view_context_get(IntPtr obj);
+
+		[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
+        public delegate void InterceptRequestCallback(IntPtr context, IntPtr request, IntPtr userData);
+
+        [DllImport(ChromiumEwk)]
+		internal static extern void ewk_context_intercept_request_callback_set(IntPtr context, InterceptRequestCallback callback, IntPtr userData);
+
+		[DllImport(ChromiumEwk, EntryPoint = "ewk_intercept_request_url_get")]
+		internal static extern IntPtr _ewk_intercept_request_url_get(IntPtr request);
+
+		[DllImport(ChromiumEwk, EntryPoint = "ewk_intercept_request_http_method_get")]
+		internal static extern IntPtr _ewk_intercept_request_http_method_get(IntPtr request);
+
+		internal static string ewk_intercept_request_http_method_get(IntPtr request)
+		{
+			return Marshal.PtrToStringAnsi(_ewk_intercept_request_http_method_get(request)) ?? string.Empty;
+        }
+
+        [DllImport(ChromiumEwk)]
+		internal static extern bool ewk_intercept_request_ignore(IntPtr request);
+
+#pragma warning disable CA2101 // Specify marshaling for P/Invoke string arguments
+		[DllImport(ChromiumEwk)]
+#pragma warning restore CA2101 // Specify marshaling for P/Invoke string arguments
+		internal static extern bool ewk_intercept_request_response_set(IntPtr request, string header, string body, uint length);
+	}
+}