CDNI K. Ma Internet-Draft Ericsson Intended status: Informational October 8, 2015 Expires: April 10, 2016 CDNI Media Type Registration draft-ietf-cdni-media-type-05 Abstract This document defines the standard media type used by the Content Delivery Network Interconnection (CDNI) protocol suite, including the registration procedure and recommended usage of the required payload- type parameter . Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on April 10, 2016. Copyright Notice Copyright (c) 2015 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Ma Expires April 10, 2016 [Page 1] Internet-Draft CDNI Media Type October 2015 Table of Contents 1. Introduction and Scope . . . . . . . . . . . . . . . . . . . 2 2. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 2 2.1. CDNI Media Type . . . . . . . . . . . . . . . . . . . . . 2 2.2. CDNI Payload Type Parameter Registry . . . . . . . . . . 4 3. References . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.1. Normative References . . . . . . . . . . . . . . . . . . 5 3.2. Informative References . . . . . . . . . . . . . . . . . 6 Appendix A. Acknowledgment . . . . . . . . . . . . . . . . . . . 6 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 6 1. Introduction and Scope The Content Delivery Network Interconnection (CDNI) working group is developing a set of protocols to enable the interconnection of multiple content delivery networks (CDNs), as discussed in [RFC6770]. The CDNI protocol suite consists of multiple HTTP-based interfaces, many of which transfer various JSON (JavaScript Object Notation) encoded payloads [RFC7159]. The main interfaces (i.e., CDNI Control interface, CDNI Footprint & Capabilities Advertisement interface, CDNI Request Routing Redirection interface, CDNI Metadata interface, and CDNI Logging interface) are described in [RFC7336]. It is desirable to be able to indicate the type of object carried in the HTTP entity-body without having to register separate media types for each CDNI object. To accomplish this aims, this document defines a single new media type for CDNI that includes a required payload-type parameter. A separate registry of CDNI payload-type parameters is also defined. CDNI protocol specifications may register interface- specific payload-types, specifying the payload encoding and parsing semantics for that message (e.g., JSON serialization for a CDNI metadata object). The same payload-type parameter may also be used as references for other purposes (e.g., referencing CDNI metadata objects from CDNI capability advertisement objects). 2. IANA Considerations This section contains the CDNI media type registration request for IANA, as well as the payload-type parameter registry definition for IANA. 2.1. CDNI Media Type Type name: application Subtype name: cdni Required parameters: Ma Expires April 10, 2016 [Page 2] Internet-Draft CDNI Media Type October 2015 ptype The required parameter "ptype" describes the type of CDNI message contained in the message payload, as registered in the CDNI Payload Type Parameter Registry (Section 2.2) defined below. Optional parameters: none Encoding considerations: The CDNI protocol suite includes interfaces with encoded messages which may be 8bit or binary, as well as generic logging information which may be 7bit or binary. Security considerations: CDNI interfaces that return encoded data may be (mis)interpreted if parsed by non-CDNI or non-compliant CDNI implementations. In addition, CDNI logging information is likely to transfer large amounts of data which may overload unexpecting clients. The individual CDNI interface specifications provide more detailed analysis of security and privacy concerns, and define the requirements for authentication, authorization, confidentiality, integrity, and privacy for each interface. The application/cdni media type is a generic media type to be used by multiple CDNI interfaces for transporting different types of control and logging information. Proper validation of message data requires parsing and understanding the ptype parameter and the associated data encoding. Failure to properly validate payloads may allow data extrusion under the auspices of the application/cdni media type. Interoperability considerations: The required ptype field is intended to fully describe the structure and parsing of CDNI messages, as enforced by the ptype registry designated expert. Published specification: RFCthis Applications that use this media type: CDNI is intended for use between interconnected CDNs for sharing configuration and logging data, as well as for issuing content management and redirection requests. Ma Expires April 10, 2016 [Page 3] Internet-Draft CDNI Media Type October 2015 Fragment identifier considerations: N/A Additional information: N/A Deprecated alias names for this type: N/A Magic number(s): N/A File extension(s): N/A Macintosh file type code(s): N/A Person & email address to contact for further information: Kevin Ma Intended usage: LIMITED USE Restrictions on usage: This media type is intended only for use in CDNI protocol message exchanges. Author: IETF CDNI working group Change controller: IETF CDNI working group Provisional registration: no 2.2. CDNI Payload Type Parameter Registry The IANA is requested to create a new "CDNI Payload Type" registry. The "CDNI Payload Type" namespace defines the valid values for the required "ptype" parameter of the "application/cdni" media type. The CDNI Payload Type is an ASCII string value, consisting of only visible (printing) characters, but excluding equal signs (=), double quotes ("), and semicolons (;), and not exceeding 256 characters in length. ptype = 1*256(ptype-char) ptype-char = %x21 / %x23-3A / %x3C / %x3E-7E ; Includes ALPHA, DIGIT, and other printables ; Excludes equal signs (=), double quotes ("), semicolons (;) Additions to the CDNI Payload Type namespace will conform to the "Specification Required" policy as defined in [RFC5226]. The designated expert will verify that new type definitions do not duplicate existing type definitions (in name or functionality), Ma Expires April 10, 2016 [Page 4] Internet-Draft CDNI Media Type October 2015 prevent gratuitous additions to the namespace, and prevent any additions to the namespace which would impair the interoperability of CDNI implementations. The designated expert will review the specification, even if it is a Standards Track RFC, to verify that it contains the following information: o The review will verify that the specification contains a reasonably defined purpose for the new payload type, where the purpose is related to an existing or proposed CDNI interface and does not duplicate the functionality of any existing CDNI protocol feature without specifying a rational reason (e.g., updating an obsolete feature), a method for detecting and handling conflicts (e.g., a versioning system with prioritization matrix), and a suggested migration path (e.g., deprecation of the overlapped feature, or justification for co-existence). o The review will verify that the specification contains information as to which CDNI interface the new payload type pertains/affects. The payload type may be applicable to multiple CDNI interfaces, but the justification for the new payload type will include a reasonable relationship to at least one standards track CDNI interface. o The review will verify that the specification contains sufficient detail about the data encoding (e.g., JSON serialization for new CDNI metadata or capability advertisement objects, or ABNF and description for new CDNI logging file formats) to allow senders and receivers of the new payload type to implement compliant and interoperable payload parsers. The registry contains the Payload Type, and the specification describing the Payload Type. The registry will initially be unpopulated. +--------------+---------------+ | Payload Type | Specification | +--------------+---------------+ +--------------+---------------+ 3. References 3.1. Normative References [RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an IANA Considerations Section in RFCs", BCP 26, RFC 5226, DOI 10.17487/RFC5226, May 2008, . Ma Expires April 10, 2016 [Page 5] Internet-Draft CDNI Media Type October 2015 3.2. Informative References [RFC6770] Bertrand, G., Ed., Stephan, E., Burbridge, T., Eardley, P., Ma, K., and G. Watson, "Use Cases for Content Delivery Network Interconnection", RFC 6770, DOI 10.17487/RFC6770, November 2012, . [RFC7159] Bray, T., Ed., "The JavaScript Object Notation (JSON) Data Interchange Format", RFC 7159, DOI 10.17487/RFC7159, March 2014, . [RFC7336] Peterson, L., Davie, B., and R. van Brandenburg, Ed., "Framework for Content Distribution Network Interconnection (CDNI)", RFC 7336, DOI 10.17487/RFC7336, August 2014, . Appendix A. Acknowledgment This document is the culmination of the efforts of many in the CDNI working group, including (in alphabetical order): Francois Le Faucheur, Daryl Malas, Rob Murray, Ben Niven-Jenkins, Iuniana Oprescu, Jon Peterson, and Jan Seedorf. Author's Address Kevin J. Ma Ericsson 43 Nagog Park Acton, MA 01720 USA Phone: +1 978-844-5100 Email: kevin.j.ma@ericsson.com Ma Expires April 10, 2016 [Page 6]