[Openid-specs-ab] Response types clarification

John Bradley ve7jtb at ve7jtb.com
Mon Feb 20 19:44:13 UTC 2012

Response types are single values.   (I am starting to hate Erin's compromise)

The response types are documented in: http://openid.bitbucket.org/oauth-v2-multiple-response-types-1_0.html

The response types "code id_token",  "id_token token", and "code id_token token"  MUST return a id_token and the response SHOULD be fragment encoded.

Now you are asking yourself why is that SHOULD be fragment encoded as opposed to MUST be fragment encoded.

The reason for that is that the response_type registration is leaving wiggle room to use the same response type with post message as well.

For that to work the client would need to register a JS Origin and DOM Channel Names(or pick a fixed strings).  We did stub in post message configuration parameters, but removed them due to there not being a OAuth spec yet.   

Probably more than the yes you were looking for, but the history provides some perspective.

John B.
On 2012-02-20, at 3:52 PM, Torsten Lodderstedt wrote:

> Hi John,
> thanks for the clarification.
> So all response types containing the string value "id_token" cause the authorization server to directly return a id_token (along with all other parameters) to the client via fragment?
> regards,
> Torsten.
> Am 20.02.2012 19:48, schrieb John Bradley:
>> Inline
>> On 2012-02-20, at 3:30 PM, Torsten Lodderstedt wrote:
>>> Hi all,
>>> I'm trying to catch up with the Implementors Draft and need some advice from the group.
>>> Is it correct that "code" is the only response type, which is delivered to the client via URI query parameter? For all other response types, the response parameters are encoded within the URI fragment.
>> Yes
>>> Furthermore, is the client always issued an access token _and_ an id_token for scope "openid" and response type "code"?
>> The response from the Authorization server is code as was asked for.
>> The Token endpoint includes id_token in it's response as an extra parameter.
>> So strictly speaking Yes id_token is always issued if the scope is 'openid'  (scope is a single value with spaces, so don't say includes) and the response_type is code.
>> However the response type is code and only code.
>> The id_token is only returned if code is exchanged at the token endpoint for and access_token and id_token.
>> So I suppose you could avoid getting id_token by not exchanging code, but I don't think anyone is going to think that is a good idea.
>> The problem is that response)type only controls what comes back from the Authorization endpoint, and not the token endpoint.
>> The only option we found was overloading a scope to change the behaviour of the token endpoint to return the extra value.
>> The token endpoint response is direct, so size is not a big issue.  It was simpler to always return it from that endpoint than create a complicated way of asking for it from the token endpoint.
>> Worst case the response is a bit bigger, but the client ignores the extra parameter.
>> John B.
>>> thanks in advance,
>>> Torsten.
>>> _______________________________________________
>>> Openid-specs-ab mailing list
>>> Openid-specs-ab at lists.openid.net
>>> http://lists.openid.net/mailman/listinfo/openid-specs-ab

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