Implement ClearKey message format as JSON.

content/renderer/media/crypto/proxy_decryptor.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/media/crypto/proxy_decryptor.h"
 
 #include <cstring>
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ skipping 212 matching lines @@
       base::Bind(&ProxyDecryptor::OnSessionClosed,
                  weak_ptr_factory_.GetWeakPtr()),
       base::Bind(&ProxyDecryptor::OnSessionError,
                  weak_ptr_factory_.GetWeakPtr()));
 }
 
 void ProxyDecryptor::OnSessionMessage(const std::string& web_session_id,
                                       const std::vector<uint8>& message,
                                       const GURL& destination_url) {
   // Assumes that OnSessionCreated() has been called before this.
+
+  // For ClearKey, convert the message from JSON into just passing the key
+  // as the message. If unable to extract the key, return the message unchanged.
+  if (is_clear_key_) {
+    std::vector<uint8> key;
+    if (media::ExtractFirstKeyIdFromLicenseRequest(message, &key)) {
+      key_message_cb_.Run(web_session_id, key, destination_url);
+      return;
+    }
+  }
+
   key_message_cb_.Run(web_session_id, message, destination_url);
 }
 
 void ProxyDecryptor::OnSessionReady(const std::string& web_session_id) {
   key_added_cb_.Run(web_session_id);
 }
 
 void ProxyDecryptor::OnSessionClosed(const std::string& web_session_id) {
   base::hash_map<std::string, bool>::iterator it =
       active_sessions_.find(web_session_id);
@@ skipping 42 matching lines @@
   }
   key_error_cb_.Run(web_session_id, error_code, system_code);
 }
 
 void ProxyDecryptor::SetSessionId(bool persistent,
                                   const std::string& web_session_id) {
   active_sessions_.insert(std::make_pair(web_session_id, persistent));
 }
 
 }  // namespace content