Alternatively if the appendix were as of a point in time but the github 
references were maintained, the warning that the RFC is a point-in-time while 
the github references will remain current lets you defer authoring an updated 
BCP RFC until there are much larger changes in mechanics.

From: John Bradley <[email protected]>
Sent: Tuesday, August 27, 2019 6:52 AM
To: William Denniss <[email protected]>
Cc: RFC Errata System <[email protected]>; Hannes Tschofenig 
<[email protected]>; Bayard Bell <[email protected]>; Benjamin 
Kaduk <[email protected]>; oauth <[email protected]>; Roman Danyliw <[email protected]>; 
[email protected]; [email protected]; Rifaat Shekh-Yusef 
<[email protected]>
Subject: Re: [OAUTH-WG] [Technical Errata Reported] RFC8252 (5848)

This is not really an eratta.  Asome point we need to update the BCP with a 
updated RFC.   Perhaps the time is now to start a new draft that can capture 
the changes in iOS, OSX and others.

John B.

On Mon, Aug 26, 2019, 10:46 PM William Denniss 
<[email protected]<mailto:[email protected]>> wrote:
Process-wise I'm not sure if errata should be used to capture changing 
implementation details like this. We expected the implementation details that 
we documented in the appendix to change, and explicitly stated that assumption. 
"The implementation details herein are considered accurate at the time of 
publishing but will likely change over time.".

If updating those implementation details were in scope, then the proposed text 
should needs to be revised before being accepted due to some inaccuracies (e.g. 
SFSafariViewController is not a successor to ASWebAuthenticationSession).

Best,
William

On Mon, Aug 26, 2019 at 12:04 PM RFC Errata System 
<[email protected]<mailto:[email protected]>> wrote:
The following errata report has been submitted for RFC8252,
"OAuth 2.0 for Native Apps".

--------------------------------------
You may review the report below and at:
https://www.rfc-editor.org/errata/eid5848

--------------------------------------
Type: Technical
Reported by: Bayard Bell 
<[email protected]<mailto:[email protected]>>

Section: Appendix B.1

Original Text
-------------
Apps can initiate an authorization request in the browser, without
the user leaving the app, through the "SFSafariViewController" class
or its successor "SFAuthenticationSession", which implement the in-
app browser tab pattern.  Safari can be used to handle requests on
old versions of iOS without in-app browser tab functionality.

Corrected Text
--------------
Apps can initiate an authorization request in the browser, without
the user leaving the app, through the "ASWebAuthenticationSession"
class or its successors "SFAuthenticationSession" and
"SFSafariViewController", which implement the in-app browser tab
pattern.  The first of these allows calls to a handler registered
for the AS URL, consistent with Section 7.2. The latter two classes,
now deprecated, can use Safari to handle requests on old versions of
iOS without in-app browser tab functionality.

Notes
-----
SFAuthenticationSession documentation reflects deprecated status:

https://developer.apple.com/documentation/safariservices/sfauthenticationsession

Here's the documentation for ASWebAuthenticationSession:

https://developer.apple.com/documentation/authenticationservices/aswebauthenticationsession

Instructions:
-------------
This erratum is currently posted as "Reported". If necessary, please
use "Reply All" to discuss whether it should be verified or
rejected. When a decision is reached, the verifying party
can log in to change the status and edit the report, if necessary.

--------------------------------------
RFC8252 (draft-ietf-oauth-native-apps-12)
--------------------------------------
Title               : OAuth 2.0 for Native Apps
Publication Date    : October 2017
Author(s)           : W. Denniss, J. Bradley
Category            : BEST CURRENT PRACTICE
Source              : Web Authorization Protocol
Area                : Security
Stream              : IETF
Verifying Party     : IESG

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