Registration Protocols Extensions M. Loffredo
Internet-Draft IIT-CNR/Registro.it
Intended status: Standards Track G. Brown
Expires: July 28, 2021 CentralNic Group plc
January 24, 2021
Using JSContact in Registration Data Access Protocol (RDAP) JSON
Responses
draft-loffredo-regext-rdap-jcard-deprecation-04
Abstract
This document describes an RDAP extension which represents entity
contact information in JSON responses using JSContact.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on July 28, 2021.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Rationale . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2. Conventions Used in This Document . . . . . . . . . . . . 3
2. JSContact . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Using JSCard objects in RDAP Responses . . . . . . . . . . . 4
3.1. RDAP Query Parameters . . . . . . . . . . . . . . . . . . 6
4. Transition Considerations . . . . . . . . . . . . . . . . . . 7
4.1. RDAP Features Supporting a Transition Process . . . . . . 7
4.1.1. Notices and Link Relationships . . . . . . . . . . . 7
4.1.2. rdapConformance Property . . . . . . . . . . . . . . 7
4.1.3. Query Parameters . . . . . . . . . . . . . . . . . . 7
4.2. Transition Procedure . . . . . . . . . . . . . . . . . . 7
4.2.1. Transition Stages . . . . . . . . . . . . . . . . . . 8
4.2.1.1. Stage 1: only jCard provided . . . . . . . . . . 8
4.2.1.2. Stage 2: jCard sunset . . . . . . . . . . . . . . 8
4.2.1.3. Stage 3: jCard deprecation . . . . . . . . . . . 9
4.2.1.4. Stage 4: jCard deprecated . . . . . . . . . . . . 11
4.2.1.5. Length . . . . . . . . . . . . . . . . . . . . . 11
4.2.1.6. Goals . . . . . . . . . . . . . . . . . . . . . . 11
5. Implementation Status . . . . . . . . . . . . . . . . . . . . 12
5.1. IIT-CNR/Registro.it . . . . . . . . . . . . . . . . . . . 12
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13
7. Security Considerations . . . . . . . . . . . . . . . . . . . 13
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 13
8.1. Normative References . . . . . . . . . . . . . . . . . . 13
8.2. Informative References . . . . . . . . . . . . . . . . . 14
Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . 15
A.1. Change from 00 to 01 . . . . . . . . . . . . . . . . . . 15
A.2. Change from 01 to 02 . . . . . . . . . . . . . . . . . . 15
A.3. Change from 02 to 03 . . . . . . . . . . . . . . . . . . 16
A.4. Change from 03 to 04 . . . . . . . . . . . . . . . . . . 16
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 16
1. Introduction
This document specifies an extension to the Registration Data Access
Protocol (RDAP) that allows RDAP servers to use JSContact
([draft-ietf-jmap-jscontact]) to represent the contact information
associated with entities in RDAP responses, instead of jCard
([RFC7095]). It also describes the process by which an RDAP server
can transition from jCard to JSContact. RDAP query and response
extensions are defined to facilitate the transition process.
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1.1. Rationale
According to the feedback from RDAP Pilot Working Group
([RDAP-PILOT-WG], a group of RDAP server implementers representing
registries and registrars of generic TLDs), the most commonly raised
implementation concern, for both servers and client implementers,
related to the use of jCard ([RFC7095]) to represent the contact
information associated with entities. Working Group members reported
jCard to be unintuitive, complicated to implement for both clients
and servers, and incompatible with best practices for RESTful APIs.
JSContact ([draft-ietf-jmap-jscontact]) provides a simpler and more
efficient representation for contact information. In addition,
similarly to jCard, it provides a means to represent
internationalised and unstructured contact information. Support for
internationalised contact information has been recognised being
necessary to facilitate the future internationalisation of
registration data directory services.
1.2. Conventions Used in This Document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
2. JSContact
The JSContact specification defines a data model and JSON
representation of contact information that can be used for data
storage and exchange in address book or directory applications. It
aims to be an alternative to the vCard data format ([RFC6350]) and to
be unambiguous, extendable and simple to process. In contrast with
jCard, it is not a direct mapping from the vCard data model and
expands semantics where appropriate.
The JSContact specification declares two main object types: "JSCard",
which represents a single contact "card", and "JSCardGroup" which
represents a collection of JSCard objects. For the purpose of this
document, only JSCard objects are considered.
JSCard differs from jCard in that it:
o follows an object-oriented rather than array-oriented approach;
o is simple to process;
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o requires no extra work in serialization/deserialization from/to a
data model;
o includes no "jagged" arrays;
o prefers maps rather than arrays to implement collections;
o is able to represent redacted contacts (both "name" and"fullName"
properties are optional).
[draft-ietf-jmap-jscontact-vcard] provides informational guidance on
the conversion of jCard objects into JSCard objects, and vice versa.
3. Using JSCard objects in RDAP Responses
Entity objects in RDAP responses MAY include a "jscard" property
whose value is a JSCard object instead of the "vCardArray" property
defined in [RFC7483].
Servers returning the "jscard" property in their response MUST
include "jscard" in the "rdapConformance" array.
An example of an RDAP response containing a "jscard" property is
shown in Figure 1. The "jscard" object in this example has been
converted from the example included in section 5.1 of [RFC7483].
{
"rdapConformance": [
"rdap_level_0",
"jscard"
],
"objectClassName" : "entity",
"handle":"XXXX",
"jscard":{
"uid": "XXXX",
"fullName": { "value": "Joe User" },
"kind": "individual",
"preferredContactLanguages": {
"fr": { "preference": 1 },
"en": { "preference": 2 }
},
"organization": [ { "value": "Example" } ],
"jobTitle": [ { "value": "Research Scientist" } ],
"role": [ { "value": "Project Lead" } ],
"addresses": [
{
"context": "work",
"extension": "Suite 1234",
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"street": "4321 Rue Somewhere",
"locality": "Quebec",
"region": "QC",
"postcode": "G1V 2M2",
"country": "Canada",
"coordinates": "geo:46.772673,-71.282945",
"timeZone": "Canada/Eastern"
},
{
"context": "private",
"fullAddress": {
"value": "123 Maple Ave\nSuite 90001\nVancouver\nBC\n1239\n"
}
}
],
"phones": [
{
"context": "work",
"type": "voice",
"labels": {
"cell": true,
"video": true,
"text": true
},
"isPreferred": true,
"value": "tel:+1-555-555-1234;ext=102"
}
],
"emails": [
{
"context": "work",
"value": "joe.user@example.com"
}
],
"online": [
{
"context": "work",
"type": "uri",
"labels": { "key": true },
"value": "http://www.example.com/joe.user/joe.asc"
},
{
"context": "private",
"type": "uri",
"labels": { "url": true },
"value": "http://example.org"
}
]
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}
"roles":[ "registrar" ],
"publicIds":[
{
"type":"IANA Registrar ID",
"identifier":"1"
}
],
"remarks":[
{
"description":[
"She sells sea shells down by the sea shore.",
"Originally written by Terry Sullivan."
]
}
],
"links":[
{
"value":"http://example.com/entity/XXXX",
"rel":"self",
"href":"http://example.com/entity/XXXX",
"type" : "application/rdap+json"
}
],
"events":[
{
"eventAction":"registration",
"eventDate":"1990-12-31T23:59:59Z"
}
],
"asEventActor":[
{
"eventAction":"last changed",
"eventDate":"1991-12-31T23:59:59Z"
}
]
}
Figure 1: Example of "jscard" in RDAP response
3.1. RDAP Query Parameters
Two new query parameters are defined for the purpose of this
document.
The query parameters are OPTIONAL extensions of path segments defined
in [RFC7482]. They are as follows:
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o "jscard": a boolean value that allows a client to request the
"jscard" property in the RDAP response;
o "jcard": a boolean value that allows a client to request the
"vcardArray" property in the RDAP response.
These parameters are furtherly explained in Section 4.
4. Transition Considerations
4.1. RDAP Features Supporting a Transition Process
4.1.1. Notices and Link Relationships
RDAP allows servers to communicate service information to clients
through notices. An RDAP response may contain one or more notice
objects ([RFC7483], Section 4.3), each of which may include a set of
link objects, which can be used to provide clients with references
and documentation. These link objects may have a "rel" property
which defines the relationship type, as described in [RFC8288],
Section 4. The transition process outlined in this document uses two
types of link relation:
o "deprecation", as described in
[draft-ietf-httpapi-deprecation-header];
o "alternate", as described in [RFC8288].
4.1.2. rdapConformance Property
The information about the specifications used in the construction of
the response is also described by the strings which appear in the
"rdapConformance" property of the RDAP response.
4.1.3. Query Parameters
Clients are able to ask servers to use specific RDAP features by
using appropriate query parameters as described in [RFC7482].
4.2. Transition Procedure
The procedure for jCard to JSCard transition consists of four
contiguous stages. During the procedure, the presence of "jscard"
tag in the rdapConformance array indicates that JSCard is returned
instead of jCard. The time format used to notify clients about this
procedure is defined in [RFC3339].
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Some elements of the following procedure are based on the best
practices in [API-DEPRECATION].
4.2.1. Transition Stages
4.2.1.1. Stage 1: only jCard provided
This stage corresponds to providing jCard as default contact card
([RFC7483]). The RDAP server is not able to provide an alternate
contact card. The rdapConformance array MUST NOT contain the
"jscard" tag.
4.2.1.2. Stage 2: jCard sunset
During this stage, the server uses jCard by default, but the RDAP
server will return JSCard if the client sets the query parameter
"jscard" to a true value. The rdapConformance array MUST contain the
"jscard" tag if JSCard is requested.
The RDAP server SHOULD include a notice titled "jCard sunset end".
Such a notice should include a description reporting the jCard sunset
end time and two links:
o "deprecation": a link to a URI-identified resource documenting the
jCard deprecation;
o "alternate": if JSCard is not requested, a link to the JSCard
version of same resource as identified by the current query string
plus the parameter "jscard" set to a true value (Figure 2);
otherwise, only the "deprecation" link is provided (Figure 3).
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"notices": [
{
"title": "jCard sunset end",
"description": ["2020-07-01T00:00:00Z"],
"links": [{
"value": "http://example.net/entity/XXXX",
"rel": "deprecation",
"type": "text/html",
"href": "http://www.example.com/jcard_deprecation.html"
},
{
"value": "http://example.net/entity/XXXX",
"rel": "alternate",
"type": "application/rdap+json",
"href": " http://example.net/entity/XXXX?jscard=1"
}
]
}
]
Figure 2: jCard sunset - JSCard not requested
"notices": [
{
"title": "jCard sunset end",
"description": ["2020-07-01T00:00:00Z"],
"links": [
{
"value": "http://example.net/entity/XXXX?jscard=1",
"rel": "deprecation",
"type": "text/html",
"href": "http://www.example.com/jcard_deprecation.html"
}
]
}
]
Figure 3: jCard sunset - JSCard requested
4.2.1.3. Stage 3: jCard deprecation
This stage corresponds to the provisioning of JSCard by default, but
the RDAP will return jCard if the client sets the query parameter
"jcard" to a true value. The rdapConformance array contains the
"jscard" tag unless jCard is requested. The "jscard" query parameter
is ignored.
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The RDAP server SHOULD to return a notice titled "jCard deprecation
end". Such a notice should include a description reporting the jCard
deprecation end time and two links:
o "deprecation": a link to a URI-identified resource documenting the
jCard deprecation;
o "alternate": if jCard is not requested, a link to the jCard
version of the same resource as identified by the current query
string plus the parameter "jcard" set to 1/true/yes (Figure 4);
otherwise, a link to the JSCard version of the same resource as
identified by the current query string without the parameter
"jcard" (Figure 5).
"notices": [
{
"title": "jCard deprecation end",
"description": ["2020-12-31T23:59:59Z"],
"links": [
{
"value": "http://example.net/entity/XXXX",
"rel": "deprecation",
"type": "text/html",
"href": "http://www.example.com/jcard_deprecation.html"
},
{
"value": "http://example.net/entity/XXXX",
"rel": "alternate",
"type": "application/rdap+json",
"href": " http://example.net/entity/XXXX?jcard=1"
}
]
}
]
Figure 4: jCard deprecation - jCard not requested
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"notices": [
{
"title": "jCard deprecation end",
"description": ["2020-12-31T23:59:59Z"],
"links": [
{
"value": "http://example.net/entity/XXXX?jcard=1",
"rel": "deprecation",
"type": "text/html",
"href": "http://www.example.com/jcard_deprecation.html"
},
{
"value": "http://example.net/entity/XXXX?jcard=1",
"rel": "alternate",
"type": "application/rdap+json",
"href": " http://example.net/entity/XXXX"
}
]
}
]
Figure 5: jCard deprecation - jCard requested
4.2.1.4. Stage 4: jCard deprecated
This stage corresponds to providing JSCard as default contact card.
The RDAP server is not able to provide an alternate contact card.
The rdapConformance array always contains "jscard" tag. The RDAP
server doesn't include any notice about the jCard deprecation
process. Both "jscard" and "jcard" query parameters are ignored.
4.2.1.5. Length
The length of both jCard sunset and jCard deprecation periods are not
fixed by this specification. Best practices in REST API deprecation
suggest that, depending on the deprecated API's reach, user base and
service offering, a convenient time could be anywhere between 3 - 8
months. Anyway, RDAP providers are recommended to monitor the server
log to figure out whether declared times need to be changed to meet
client requirements.
4.2.1.6. Goals
The procedure described in this document achieves the following
goals:
o only one contact representation would be included in the response;
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o the response would always be compliant to [RFC7483];
o clients would be informed about the transition timeline;
o the backward compatibility would be guaranteed throughout the
transition;
o servers and clients could execute their transitions independently.
5. Implementation Status
NOTE: Please remove this section and the reference to RFC 7942 prior
to publication as an RFC.
This section records the status of known implementations of the
protocol defined by this specification at the time of posting of this
Internet-Draft, and is based on a proposal described in RFC 7942
[RFC7942]. The description of implementations in this section is
intended to assist the IETF in its decision processes in progressing
drafts to RFCs. Please note that the listing of any individual
implementation here does not imply endorsement by the IETF.
Furthermore, no effort has been spent to verify the information
presented here that was supplied by IETF contributors. This is not
intended as, and must not be construed to be, a catalog of available
implementations or their features. Readers are advised to note that
other implementations may exist.
According to RFC 7942, "this will allow reviewers and working groups
to assign due consideration to documents that have the benefit of
running code, which may serve as evidence of valuable experimentation
and feedback that have made the implemented protocols more mature.
It is up to the individual working groups to use this information as
they see fit".
5.1. IIT-CNR/Registro.it
Responsible Organization: Institute of Informatics and Telematics
of National Research Council (IIT-CNR)/Registro.it
Location: https://rdap.pubtest.nic.it/
Description: This implementation includes support for RDAP queries
using data from the public test environment of .it ccTLD.
Level of Maturity: This is a "proof of concept" research
implementation.
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Coverage: This implementation includes all of the features
described in this specification.
Contact Information: Mario Loffredo, mario.loffredo@iit.cnr.it
6. IANA Considerations
IANA is requested to register the following values in the RDAP
Extensions Registry:
Extension identifier: jscard
Registry operator: Any
Published specification: This document.
Contact: IETF <iesg@ietf.org>
Intended usage: This extension represents a contact card provided
in an RDAP response according to the JSContact specification
([draft-ietf-jmap-jscontact]).
7. Security Considerations
Unlike jCard, the formatted name as well as any other personally
identifiable information is not required in JSCard. The only
mandatory property, namely "uid", is usually an opaque string.
Therefore, redacted properties can be merely excluded without using
placeholder values.
8. References
8.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC3339] Klyne, G. and C. Newman, "Date and Time on the Internet:
Timestamps", RFC 3339, DOI 10.17487/RFC3339, July 2002,
<https://www.rfc-editor.org/info/rfc3339>.
[RFC6350] Perreault, S., "vCard Format Specification", RFC 6350,
DOI 10.17487/RFC6350, August 2011,
<https://www.rfc-editor.org/info/rfc6350>.
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[RFC7095] Kewisch, P., "jCard: The JSON Format for vCard", RFC 7095,
DOI 10.17487/RFC7095, January 2014,
<https://www.rfc-editor.org/info/rfc7095>.
[RFC7482] Newton, A. and S. Hollenbeck, "Registration Data Access
Protocol (RDAP) Query Format", RFC 7482,
DOI 10.17487/RFC7482, March 2015,
<https://www.rfc-editor.org/info/rfc7482>.
[RFC7483] Newton, A. and S. Hollenbeck, "JSON Responses for the
Registration Data Access Protocol (RDAP)", RFC 7483,
DOI 10.17487/RFC7483, March 2015,
<https://www.rfc-editor.org/info/rfc7483>.
[RFC7942] Sheffer, Y. and A. Farrel, "Improving Awareness of Running
Code: The Implementation Status Section", BCP 205,
RFC 7942, DOI 10.17487/RFC7942, July 2016,
<https://www.rfc-editor.org/info/rfc7942>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.
[RFC8288] Nottingham, M., "Web Linking", RFC 8288,
DOI 10.17487/RFC8288, October 2017,
<https://www.rfc-editor.org/info/rfc8288>.
8.2. Informative References
[API-DEPRECATION]
Sandoval, K., "How to Smartly Sunset and Deprecate APIs",
August 2019, <https://web.archive.org/web/20200417084255/
https://nordicapis.com/how-to-smartly-sunset-and-
deprecate-apis/>.
[draft-ietf-httpapi-deprecation-header]
Dalal, S. and E. Wilde, "The Deprecation HTTP Header
Field", <https://datatracker.ietf.org/doc/draft-ietf-
httpapi-deprecation-header/>.
[draft-ietf-jmap-jscontact]
Stepanek, R. and M. Loffredo, "JSContact: A JSON
representation of contact data",
<https://datatracker.ietf.org/doc/draft-ietf-jmap-
jscontact/>.
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[draft-ietf-jmap-jscontact-vcard]
Loffredo, M. and R. Stepanek, "JSContact: Converting from
and to vCard", <https://datatracker.ietf.org/doc/draft-
ietf-jmap-jscontact-vcard/>.
[RDAP-PILOT-WG]
ICANN RDAP Pilot WG, "RDAP Pilot Report", April 2019,
<https://www.icann.org/en/system/files/files/rdap-pilot-
report-25apr19-en.pdf>.
Appendix A. Change Log
A.1. Change from 00 to 01
1. Changed category from "Best Current Practice" to "Standards
Track"
2. Replaced the example of Figure 1
3. Changed the title of the "Migration from JCard to JSCard"
section to "Transition Considerations"
4. Added Section 3.1
5. Updated Section 6
6. Updated Section 7
7. Rearranged the description of stage 1 in Section 4.2.1
8. Changed the names of the transition stages 1 and 2
9. Corrected Figure 2, Figure 4, Figure 5
10. Changed the rdapConformance tag "jscard_level_0" to "jscard"
11. Removed the "Best Practices for deprecating a REST API features"
section, but added a useful reference.
A.2. Change from 01 to 02
1. Removed the sentence "which cannot be represented using jCard" in
Section 1.1.
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A.3. Change from 02 to 03
1. Updated section "Conventions Used in This Document".
2. Updated the contact in "IANA Considerations" section.
3. Changed the reference draft-loffredo-jmap-jscontact-vcard to
draft-ietf-jmap-jscontact-vcard.
4. Added reference to RFC8174.
5. Other minor edits.
A.4. Change from 03 to 04
1. Updated the reference draft-dalal-deprecation-header to draft-
ietf-httpapi-deprecation-header.
Authors' Addresses
Mario Loffredo
IIT-CNR/Registro.it
Via Moruzzi,1
Pisa 56124
IT
Email: mario.loffredo@iit.cnr.it
URI: http://www.iit.cnr.it
Gavin Brown
CentralNic Group plc
Saddlers House, 44 Gutter Lane
London, England EC2V 6BR
GB
Phone: +44 20 33 88 0600
Email: gavin.brown@centralnic.com
URI: https://www.centralnic.com
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