[Bug 26683] New: Replace MediaKeyMessageEvent's "destinationURL" attribute with a "type" attribute

https://www.w3.org/Bugs/Public/show_bug.cgi?id=26683

            Bug ID: 26683
           Summary: Replace MediaKeyMessageEvent's "destinationURL"
                    attribute with a "type" attribute
           Product: HTML WG
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Encrypted Media Extensions
          Assignee: adrianba@microsoft.com
          Reporter: ddorwin@google.com
        QA Contact: public-html-bugzilla@w3.org
                CC: mike@w3.org, public-html-media@w3.org

The application should control which URLs it uses and where it sends data. In
general, it seems wrong for the user agent or - especially - the CDM to tell
the application where to send a message.

URLs present other problems as well:
* "An application may choose not to send the message to this URL."
* The URLs may be normalized.
* URLs can be abused.
* URLs may be used incorrectly (i.e. including privacy-sensitive information).
* Applications should verify a URL before using it, but there is no way to
enforce this and it seems likely many authors will fail to do so.
* There are two paragraphs on URLs in the Security Considerations section.

With the removal of support for parsing URLs from the initData (bug 25920), the
remaining known use cases are a "heartbeat" URL and maybe initialization. These
could be handled by the CDM telling the application the type of message it has
provided and allowing the application to select, if it wishes, a different
server. This is equivalent to the "heartbeat" scenario where the application
author would configure the license server to provide a different URL to receive
heartbeat messages, but it avoids the issues described above.

Thus, I propose changing MediaKeyMessageEvent's definition to (enum types TBD)

enum MessageType { "default", "heartbeat",... };
interface MediaKeyMessageEvent : Event {
  readonly attribute ArrayBuffer message;
  readonly attribute MessageType type;
};

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Received on Wednesday, 27 August 2014 23:22:27 UTC