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REST Driver and Pagination (Link Header with rel="next")

Thomas Reibenwein

Hi!

I´m working on an IDM integration of an existing REST API using IDM 4.8.1 and  the REST driver 1.1.1.0. The driver has to provide user and group entitlements with value from the application.

The API has an endpoint to get the list of available permissiongroups, but as result of a GET request the API returns only a limited number (currently 100) of objects plus a Link header with rel="next" to get the next.

Level 7 Trace shows the returned header (with anonymized URLs):

[09/15/20 14:27:48.668]:RESTDRIVER PT:RESTDRIVER: poll
[09/15/20 14:27:48.669]:RESTDRIVER PT:RESTDRIVER: Custom: preparing GET to apiserver.domain/.../permissiongroups
[09/15/20 14:27:48.670]:RESTDRIVER PT:RESTDRIVER: Resetting headers
[09/15/20 14:27:48.670]:RESTDRIVER PT:RESTDRIVER: Setting the following HTTP request properties:
Authorization: <content suppressed>
[09/15/20 14:27:48.670]:RESTDRIVER PT:RESTDRIVER: Accept:application/json
[09/15/20 14:27:48.671]:RESTDRIVER PT:RESTDRIVER: Did a HTTP GET with 0 bytes of data to apiserver.domain/.../permissiongroups
[09/15/20 14:27:48.671]:RESTDRIVER PT:RESTDRIVER: *******************************************************
[09/15/20 14:27:48.672]:RESTDRIVER PT:RESTDRIVER: **********************LOGGING REQUEST******************
[09/15/20 14:27:48.672]:RESTDRIVER PT:RESTDRIVER: *******************************************************
[09/15/20 14:27:48.672]:RESTDRIVER PT:RESTDRIVER: Request URL :apiserver.domain/.../permissiongroups
[09/15/20 14:27:48.673]:RESTDRIVER PT:RESTDRIVER: Http Method : GET
[09/15/20 14:27:48.673]:RESTDRIVER PT:RESTDRIVER: Sending http request with below headers :-
[09/15/20 14:27:48.673]:RESTDRIVER PT:RESTDRIVER: Authorization: <content suppressed>
[09/15/20 14:27:48.673]:RESTDRIVER PT:RESTDRIVER: Accept: application/json
[09/15/20 14:27:48.673]:RESTDRIVER PT:RESTDRIVER: ***************************END**************************
[09/15/20 14:27:48.943]:RESTDRIVER PT:RESTDRIVER: ********************************************************
[09/15/20 14:27:48.943]:RESTDRIVER PT:RESTDRIVER: ***********************LOGGING RESPONSE*****************
[09/15/20 14:27:48.943]:RESTDRIVER PT:RESTDRIVER: ********************************************************
[09/15/20 14:27:48.943]:RESTDRIVER PT:RESTDRIVER: Http response code : 200
[09/15/20 14:27:48.943]:RESTDRIVER PT:RESTDRIVER: Http response status : HTTP/1.1 200 OK
[09/15/20 14:27:48.944]:RESTDRIVER PT:RESTDRIVER: Getting http response with below headers :-
[09/15/20 14:27:48.944]:RESTDRIVER PT:RESTDRIVER: Date: Tue, 15 Sep 2020 12:27:40 GMT
[09/15/20 14:27:48.944]:RESTDRIVER PT:RESTDRIVER: Server: Apache
[09/15/20 14:27:48.944]:RESTDRIVER PT:RESTDRIVER: Expires: 0
[09/15/20 14:27:48.944]:RESTDRIVER PT:RESTDRIVER: Cache-Control: no-cache, no-store, must-revalidate
[09/15/20 14:27:48.944]:RESTDRIVER PT:RESTDRIVER: Pragma: no-cache
[09/15/20 14:27:48.944]:RESTDRIVER PT:RESTDRIVER: Content-Length: 11508
[09/15/20 14:27:48.944]:RESTDRIVER PT:RESTDRIVER: Link: <apiserver.domain/.../permissiongroups rel="next"
[09/15/20 14:27:48.944]:RESTDRIVER PT:RESTDRIVER: Keep-Alive: timeout=3, max=10000
[09/15/20 14:27:48.944]:RESTDRIVER PT:RESTDRIVER: Connection: Keep-Alive
[09/15/20 14:27:48.944]:RESTDRIVER PT:RESTDRIVER: Content-Type: application/json
[09/15/20 14:27:48.945]:RESTDRIVER PT:RESTDRIVER: Sending http response with body :-
[09/15/20 14:27:48.945]:RESTDRIVER PT:RESTDRIVER: {"liste":[{..... <the first 100 records> }]}

The API does not allow to force a complete result set, or a required number of results in the request, so I have to follow the Link.

I could not find any information on how to get the REST driver to follow the links to get the complete data.

Would be grateful for any ideas...

best regards,
Thomas

PS: This is also an issue from publisher poll request.

 

 

Parents
  • 0  

    Currently the REST driver returns the request headers with the response instead the ones send by the server. (I opened an SR for this). So to get the value for Link respose header, you'll probably have to look at writing a DocumentModifier: https://www.netiq.com/documentation/identity-manager-48-drivers/generic_rest/data/bvpan6k.html

     

  • 0   in reply to   

    While this seems like a daunting task, it turns out, with basic Java skills you can do this.

     

    What happens is there is a skelton file in the Driver Dev kit, with the various classes you can add to the SOAP or Delim text drivers.

    They are basically a class definition that takes the document as input, and then returns your modified version. (For the most part).  So your code goes inside and does what is needed.  Now offhand, I have no idea how to get access to the headers... Nor how to write to them, but seems doable.

  • 0   in reply to   

    You mean the "Document Handling" class stuff?

    I am not sure that  it will be possible to get the http headers after the XDS document is recreated and send to your custom document handler.

  • 0 in reply to   

    Thank you for your answeres.

    Currently I understand:

    - the REST drriver shim itself does NOT handle paged results (thats what i initially expected)

    - the Link header from the response is not passed to the event ans is therfore not available in policies

    - it is not sure, if a Java extension can get to the Link header

    So it looks like the REST driver possibly is not the way to go...

    I could look into writing my complete own driver shim or look into the new Invoke REST Endpoint action (whitch lacks the PATCH method at least according to the documentation).

    Any other ideas?

    best regards,
    Thomas

     

     

  • 0 in reply to 

    Thomas, Norbert’s SR should allow handling pagination (albeit painfully) through Document Modifiers in the short term.

    As for supporting pagination natively, I would recommend that you log an ideas exchange request. We are actively looking at enhancing the capabilities of the REST driver, and this should get addressed with the next release of the driver.

    Regards,
    Abhishek

  • 0   in reply to 

    Hi Abhishek,

    Will you document how this is done (in details) ?

    Regards,
    Casper

Reply Children
  • 0 in reply to   

    Hi Casper,

    With the enhancement in place with a forthcoming release, there wouldn't be a need for this less than optimum mechanism to be documented.


    Let me see what can be done in the short term. Additionally, we already have experts on the community(including you!) who I hope would offer guidance!

    Regards,
    Abhishek

  • 0   in reply to 

    I think what Casper is asking you, is how to handle the pagination in a document modifier?

    I think he is referring to your first sentence "Norbert’s SR should allow handling pagination (albeit painfully) through Document Modifiers in the short term."

    Not the second one.

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