Update CastSocket connection flow to check for receiver credentials.

chrome/browser/extensions/api/cast_channel/cast_message_util.cc

Index: chrome/browser/extensions/api/cast_channel/cast_message_util.cc
===================================================================
--- chrome/browser/extensions/api/cast_channel/cast_message_util.cc	(revision 230132)
+++ chrome/browser/extensions/api/cast_channel/cast_message_util.cc	(working copy)
@@ -11,6 +11,11 @@
 #include "chrome/browser/extensions/api/cast_channel/cast_channel.pb.h"
 #include "chrome/common/extensions/api/cast_channel.h"
 
+namespace {
+static const char kAuthNamespace[] =
+    "urn:x-cast:com.google.cast.tp.deviceauth";

[mark a. foltz, 2013/10/23 00:33:41]

wrap to previous line?

[Munjal (Google), 2013/10/23 03:22:55]

Becomes 81 cols.

+}  // namespace
+
 namespace extensions {
 namespace api {
 namespace cast_channel {
@@ -83,7 +88,7 @@
   }
 }
 
-const std::string MessageProtoToString(const CastMessage& message_proto) {
+std::string CastMessageToString(const CastMessage& message_proto) {
   std::string out("{");
   out += "namespace = " + message_proto.namespace_();
   out += ", sourceId = " + message_proto.source_id();
@@ -93,6 +98,43 @@
   return out;
 }
 
+std::string AuthMessageToString(const DeviceAuthMessage& message) {
+  std::string out("{");
+  if (message.has_challenge()) {
+    out += "\n  challenge = {},";
+  }
+  if (message.has_response()) {
+    out += "\n  response = {";
+    out += "\n    signature = " + message.response().signature();
+    out += "\n,   certificate = " +
+        message.response().client_auth_certificate();
+    out += "\n  }";
+  }
+  if (message.has_error()) {
+    out += "\n  error = {";
+    out += base::IntToString(message.error().error_type());
+    out += "}";
+  }
+  out += "}";
+  return out;
+}
+
+void CreateAuthChallengeMessage(CastMessage* message_proto) {
+  CHECK(message_proto);
+  DeviceAuthMessage auth_message;
+  auth_message.mutable_challenge();
+  std::string auth_message_string;
+  auth_message.SerializeToString(&auth_message_string);
+
+  message_proto->set_namespace_(kAuthNamespace);

[mark a. foltz, 2013/10/23 00:33:41]

You need to set source and destination ids.

[Munjal (Google), 2013/10/23 03:22:55]

Ah I see. To what values?

[mark a. foltz, 2013/10/23 05:27:45]

The destination id should be 'receiver-0'.  The source id is not specified in
our docs, I would fill in some value like 'sender-0' there.

[Munjal (Google), 2013/10/23 16:21:41]

Done.

+  message_proto->set_payload_type(CastMessage_PayloadType_BINARY);
+  message_proto->set_payload_binary(auth_message_string);
+}
+
+bool IsAuthMessage(const CastMessage& message) {
+  return message.namespace_() == kAuthNamespace;
+}
+
 }  // namespace cast_channel
 }  // namespace api
 }  // namespace extensions