[dotnet] Tolerate invalid UTF-16 strings in DevTools JSON response

dotnet/src/webdriver/DevTools/Json/DevToolsJsonOptions.cs

@@ -0,0 +1,35 @@
+// <copyright file="DevToolsJsonOptions.cs" company="Selenium Committers">
+// Licensed to the Software Freedom Conservancy (SFC) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The SFC licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+// </copyright>
+
+using System.Text.Json;
+
+#nullable enable
+
+namespace OpenQA.Selenium.DevTools.Json;
+
+internal static class DevToolsJsonOptions
+{
+    public static JsonSerializerOptions Default { get; } = new JsonSerializerOptions()
+    {
+        Converters =
+        {
+            new StringConverter(),
+        }
+    };
+}

dotnet/src/webdriver/DevTools/Json/StringConverter.cs

@@ -0,0 +1,61 @@
+// <copyright file="StringConverter.cs" company="Selenium Committers">
+// Licensed to the Software Freedom Conservancy (SFC) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The SFC licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+// </copyright>
+
+using System;
+using System.Text;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+#nullable enable
+
+namespace OpenQA.Selenium.DevTools.Json;
+
+internal sealed class StringConverter : JsonConverter<string>
+{
+    public override bool HandleNull => true;
+
+    public override string? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+    {
+        try
+        {
+            return reader.GetString();
+        }
+        catch (InvalidOperationException)
+        {
+            // Fallback to read the value as bytes instead of string.
+            // System.Text.Json library throws exception when CDP remote end sends non-encoded string as binary data.
+            // Using JavaScriptEncoder.UnsafeRelaxedJsonEscaping doesn't help because the string actually is byte[].
+            // https://chromedevtools.github.io/devtools-protocol/tot/Network/#type-Request - here "postData" property
+            // is a string, which we cannot deserialize properly. This property is marked as deprecated, and new "postDataEntries"
+            // is suggested for using, where most likely it is base64 encoded.
+
+            var bytes = reader.ValueSpan;
+            var sb = new StringBuilder(bytes.Length);
+            foreach (byte b in bytes)
+            {
+                sb.Append(Convert.ToChar(b));
+            }
+
+            return sb.ToString();
+        }
+    }
+
+    public override void Write(Utf8JsonWriter writer, string value, JsonSerializerOptions options) =>
+        writer.WriteStringValue(value);
+}

dotnet/src/webdriver/cdp/README.md

@@ -17,7 +17,7 @@ add an entry for version `<N>` to the `SupportedDevToolsVersions` dictionary ini
 6. In [`//dotnet/src/webdriver:WebDriver.csproj.prebuild.cmd`](https://github.com/SeleniumHQ/selenium/blob/trunk/dotnet/src/webdriver/WebDriver.csproj.prebuild.cmd),
 add the following block (substituting the proper value for `<N>`):
 
-```
+```bash
 if not exist  "%1..\..\..\bazel-bin\dotnet\src\webdriver\cdp\v<N>\DevToolsSessionDomains.cs" (
   echo Generating CDP code for version <N>
   pushd "%1..\..\.."
@@ -29,7 +29,7 @@ if not exist  "%1..\..\..\bazel-bin\dotnet\src\webdriver\cdp\v<N>\DevToolsSessio
 7. In [`//dotnet/src/webdriver:WebDriver.csproj.prebuild.sh`](https://github.com/SeleniumHQ/selenium/blob/trunk/dotnet/src/webdriver/WebDriver.csproj.prebuild.sh),
 add the following block (substituting the proper value for `<N>`):
 
-```
+```bash
 if [[ ! -f "$1../../../bazel-bin/dotnet/src/webdriver/cdp/v<N>/DevToolsSessionDomains.cs" ]]
 then
   echo "Generating CDP code for version <N>"

third_party/dotnet/devtools/src/generator/Templates/domain.hbs

@@ -61,7 +61,7 @@ namespace {{rootNamespace}}.{{domain.Name}}
                 if (m_eventMap.ContainsKey(e.EventName))
                 {
                     var eventData = m_eventMap[e.EventName];
-                    var eventArgs = e.EventData.Deserialize(eventData.EventArgsType);
+                    var eventArgs = e.EventData.Deserialize(eventData.EventArgsType, global::OpenQA.Selenium.DevTools.Json.DevToolsJsonOptions.Default);
                     eventData.EventInvoker(eventArgs);
                 }
             }