Replace JSON (de)serialization of extension messages with direct Value pickling.

chrome/browser/extensions/api/messaging/native_message_process_host.cc

Index: chrome/browser/extensions/api/messaging/native_message_process_host.cc
diff --git a/chrome/browser/extensions/api/messaging/native_message_process_host.cc b/chrome/browser/extensions/api/messaging/native_message_process_host.cc
index a856d2bab4cc1d4dbe0a51c82fbe5fc23bdeb0d1..1f713d39ffd17ce6b0a5734d69ccb1788a29a340 100644
--- a/chrome/browser/extensions/api/messaging/native_message_process_host.cc
+++ b/chrome/browser/extensions/api/messaging/native_message_process_host.cc
@@ -5,7 +5,9 @@
 #include "chrome/browser/extensions/api/messaging/native_message_process_host.h"
 
 #include "base/bind.h"
+#include "base/bind_helpers.h"
 #include "base/files/file_path.h"
+#include "base/json/json_reader.h"
 #include "base/logging.h"
 #include "base/platform_file.h"
 #include "base/process_util.h"
@@ -42,6 +44,8 @@ const char kForbiddenError[] =
     "Access to the specified native messaging host is forbidden.";
 const char kHostInputOuputError[] =
     "Error when communicating with the native messaging host.";
+const char kInvalidJsonError[] =
+    "Message must be valid JSON";
 
 }  // namespace
 
@@ -268,10 +272,35 @@ void NativeMessageProcessHost::ProcessIncomingData(
     if (incoming_data_.size() < message_size + kMessageHeaderSize)
       return;
 
+    scoped_ptr<base::ListValue> message(new base::ListValue());
+    {
+      std::string message_as_json =
+          incoming_data_.substr(kMessageHeaderSize, message_size);
+      int error_code;
+      std::string error_message;
+      scoped_ptr<base::Value> message_as_value(
+          base::JSONReader::ReadAndReturnError(message_as_json,
+                                               0,  // no flags
+                                               &error_code,
+                                               &error_message));
+      if (!message_as_value) {
+        base::JSONReader::JsonParseError parse_error =
+            static_cast<base::JSONReader::JsonParseError>(error_code);
+        LOG(ERROR) << "Native Messaging host sent message with invalid JSON \""
+                   << message_as_json << "\": " << error_message << " ("
+                   << base::JSONReader::ErrorCodeToString(parse_error) << "), "
+                   << "message size " << message_size << ", "
+                   << "incoming data size " << incoming_data_.size() << ".";
+        Close(kInvalidJsonError);
+        return;
+      }
+      message->Append(message_as_value.release());
+    }
+
     content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
         base::Bind(&Client::PostMessageFromNativeProcess, weak_client_ui_,
             destination_port_,
-            incoming_data_.substr(kMessageHeaderSize, message_size)));
+            base::Passed(&message)));
 
     incoming_data_.erase(0, kMessageHeaderSize + message_size);
   }