From a06c300ddeb2a7f012bd663fdcc7fe0cf4334d78 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Milan=20Kri=C5=BEalkovi=C4=8D?=
 <milan.krizalkovic@mikonboard.com>
Date: Wed, 28 Feb 2024 16:29:32 +0000
Subject: [PATCH] Prevent app crash if MAUI View becomes null

---
 .../Android/AndroidHybridWebViewClient.cs     | 83 ++++++++++++-------
 1 file changed, 51 insertions(+), 32 deletions(-)

diff --git a/HybridWebView/Platforms/Android/AndroidHybridWebViewClient.cs b/HybridWebView/Platforms/Android/AndroidHybridWebViewClient.cs
index 7c50c0a..a8670db 100644
--- a/HybridWebView/Platforms/Android/AndroidHybridWebViewClient.cs
+++ b/HybridWebView/Platforms/Android/AndroidHybridWebViewClient.cs
@@ -20,53 +20,72 @@ public AndroidHybridWebViewClient(HybridWebViewHandler handler) : base(handler)
 
             if (new Uri(requestUri) is Uri uri && HybridWebView.AppOriginUri.IsBaseOf(uri))
             {
-                var relativePath = HybridWebView.AppOriginUri.MakeRelativeUri(uri).ToString().Replace('/', '\\');
-
-                string contentType;
-                if (string.IsNullOrEmpty(relativePath))
-                {
-                    relativePath = ((HybridWebView)_handler.VirtualView).MainFile;
-                    contentType = "text/html";
-                }
-                else
+                try
                 {
-                    var requestExtension = Path.GetExtension(relativePath);
-                    contentType = requestExtension switch
+                    var relativePath = HybridWebView.AppOriginUri.MakeRelativeUri(uri).ToString().Replace('/', '\\');
+
+                    if (relativePath?.Contains("throw-error") == true)
                     {
-                        ".htm" or ".html" => "text/html",
-                        ".js" => "application/javascript",
-                        ".css" => "text/css",
-                        _ => "text/plain",
-                    };
-                }
+                        throw new InvalidOperationException("Test exceptio thrown");
+                    }
 
-                var contentStream = KnownStaticFileProvider.GetKnownResourceStream(relativePath!);
+                    string contentType;
+                    if (string.IsNullOrEmpty(relativePath))
+                    {
+                        relativePath = ((HybridWebView)_handler.VirtualView).MainFile;
+                        contentType = "text/html";
+                    }
+                    else
+                    {
+                        var requestExtension = Path.GetExtension(relativePath);
+                        contentType = requestExtension switch
+                        {
+                            ".htm" or ".html" => "text/html",
+                            ".js" => "application/javascript",
+                            ".css" => "text/css",
+                            _ => "text/plain",
+                        };
+                    }
 
-                if (contentStream is null)
-                {
-                    var assetPath = Path.Combine(((HybridWebView)_handler.VirtualView).HybridAssetRoot!, relativePath!);
-                    contentStream = PlatformOpenAppPackageFile(assetPath);
-                }
+                    var contentStream = KnownStaticFileProvider.GetKnownResourceStream(relativePath!);
 
-                if (contentStream is null)
-                {
-                    var notFoundContent = "Resource not found (404)";
+                    if (contentStream is null)
+                    {
+                        var assetPath = Path.Combine(((HybridWebView)_handler.VirtualView).HybridAssetRoot!, relativePath!);
+                        contentStream = PlatformOpenAppPackageFile(assetPath);
+                    }
 
-                    var notFoundByteArray = Encoding.UTF8.GetBytes(notFoundContent);
-                    var notFoundContentStream = new MemoryStream(notFoundByteArray);
+                    if (contentStream is null)
+                    {
+                        var notFoundContent = "Resource not found (404)";
 
-                    return new WebResourceResponse("text/plain", "UTF-8", 404, "Not Found", GetHeaders("text/plain"), notFoundContentStream);
+                        var notFoundByteArray = Encoding.UTF8.GetBytes(notFoundContent);
+                        var notFoundContentStream = new MemoryStream(notFoundByteArray);
+
+                        return new WebResourceResponse("text/plain", "UTF-8", 404, "Not Found", GetHeaders("text/plain"), notFoundContentStream);
+                    }
+                    else
+                    {
+                        // TODO: We don't know the content length because Android doesn't tell us. Seems to work without it!
+                        return new WebResourceResponse(contentType, "UTF-8", 200, "OK", GetHeaders(contentType), contentStream);
+                    }
                 }
-                else
+                catch (Exception ex)
                 {
-                    // TODO: We don't know the content length because Android doesn't tell us. Seems to work without it!
-                    return new WebResourceResponse(contentType, "UTF-8", 200, "OK", GetHeaders(contentType), contentStream);
+                    var errorContent = "Exception: " + ex.ToString(); ;
+
+                    var errorContentByteArray = Encoding.UTF8.GetBytes(errorContent);
+                    var errorContentStream = new MemoryStream(errorContentByteArray);
+
+                    return new WebResourceResponse("text/plain", "UTF-8", 500, "Internal Server Error - Webview Exception", GetHeaders("text/plain"), errorContentStream);
                 }
             }
             else
             {
                 return base.ShouldInterceptRequest(view, request);
             }
+
+
         }
 
         private Stream? PlatformOpenAppPackageFile(string filename)