The problem that I have with "always including the client_id" is *where*
to include it. Are we talking a query parameter, URI template, or
somewhere in the request body? The latter will only work for POST and
PUT, so it's out of the question to support GET and DELETE using that
semantic. I think we should support all operations using parallel syntax
-- that's just good API design.
I *really* don't like the idea of switching the action solely based on
whether or not the client_id is present in the request body of a POST.
This is a side-effectful mode switch, and it will only lead to pain and
misery. Additionally, if the input is JSON (separate discussion), then a
server would have to parse the JSON body before knowing where to route
the request. In most web development frameworks that I've used, this is
impossible. A query parameter or URL pattern, on the other hand, is doable.
As it stands right now, a server is free to include the client_id in the
"update/management" URL that it returns as part of the _link structure
(separate discussion). The current text goes as far as recommending that
practice, but doesn't take the step of requiring it in any form, and
leaving it up to the server to decide what form it takes. If a server
can route better with a query parameter, it'll return a URL to the
client that has a client_id= query parameter. If a server would rather
use a path component with the client_id, it can do that, too. If it
wants to put everything on one URL and differentiate through the request
body or presence/absence of the registration_access_token, it can always
return the same URL to every client. I think that's nuts, but you can do
it. Interoperability is preserved because the client simply follows the
returned URL to do its bits and pieces, and it doesn't ever have to
create or compose this URL from component parts.
I want to continue to distinguish between the POST and PUT operations
for create and update, respectively. This is a common pattern and the
one described in the original REST thesis that described the
architectural style. I'll also bring up that the semantics of PUT are
intended to be "replace all", which is what you had originally argued
for in the update case as well. I not convinced that developers of today
can't handle HTTP verbs like PUT if they want to do fancier operations
like updates. Note that the core operations, create and read, remain as
POST and GET, which would be well within the grasp of every library and
web developer today.
-- Justin
On 02/12/2013 02:23 AM, Torsten Lodderstedt wrote:
+1 for always including the client_id
As John pointed out, there could be different entities updating client data.
Then one has to distinguish the resource and the credential.
Am 12.02.2013 um 02:51 schrieb John Bradley <ve7...@ve7jtb.com>:
I would always include the client_id on update.
I think it is also us full to have other tokens used at the update endpoint. I
can see the master token used to update all the clients it has registered as
part of API management.
Relying on the registration_access_token is probably a design that will cause
trouble down the road.
I think GET and POST are relatively clear. I don't know about expelling PUT
to developers. I think POST with a client_id to a (separate discussion)
update_uri works without restricting it to PUT.
I think DELETE needs to be better understood. I think a status that can be
set for client lifecycle is better than letting a client delete a entry.
In some cases there will be more than one instance of a client and letting them
know they have been turned off for a reason is better than making there
registration disappear.
So for the moment I would levee out DELETE.
John B.
On 2013-02-11, at 6:14 PM, Justin Richer <jric...@mitre.org> wrote:
Draft -05 of OAuth Dynamic Client Registration [1] defines several operations that the client can take on its
behalf as part of the registration process. These boil down to the basic CRUD operations that you find in
many APIs: Create, Read, Update, Delete. Draft -00 defined only the "Create" operation, draft -01
through -04 added the "Update" operation, switched using the "operation=" parameter.
Following several suggestions to do so on the list, the -05 draft defines these
operations in terms of a RESTful API for the client. Namely:
- HTTP POST to registration endpoint => Create (register) a new client
- HTTP PUT to update endpoint (with registration_access_token) => Update the
registered information for this client
- HTTP GET to update endpoint (with registration_access_token) => read the
registered information for this client
- HTTP DELETE to update endpoint (with registration_access_token) => Delete
(unregister/de-provision) this client
The two main issues at stake here are: the addition of the READ and DELETE
methods, and the use of HTTP verbs following a RESTful design philosophy.
Pro:
- RESTful APIs (with HTTP verbs to differentiate functionality) are the norm
today
- Full lifecycle management is common and is going to be expected by many users
of this protocol in the wild
Cons:
- Update semantics are still under debate (full replace? patch?)
- Somewhat increased complexity on the server to support all operations
- Client has to understand all HTTP verbs for full access (though plain
registration is just POST)
Alternatives include using an operational switch parameter (like the old
drafts), defining separate endpoints for every action, or doing all operations
on a single endpoint using verbs to switch.
-- Justin
[1] http://tools.ietf.org/html/draft-ietf-oauth-dyn-reg-05
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