Can't paginate with OpenLDAP

[Jeremy Sweetman <je...@n8identity.com>]

Hi,

I've successfully used the Apache Directory API to load in paged user data from Active Directory. It's similar to the example code by 'oers' found in this stackoverflow question: https://stackoverflow.com/questions/17963975/apache-directory-ldap-paged-searches

Some differences I have are:
*   I'm coding it with Nashorn (Javascript running in Java)
*   I'm using the PagedResultsImpl class instead of PagedResultsDecorator
*   I'm saving the cookie as a string between calls by using a Base64 encoding of the byte[] cookie.
*   I'm using Apache Directory API with the following maven import (The links to the version 2 javadoc on the website were broken so I stuck with version 1):
    <dependency>
        <groupId>org.apache.directory.api</groupId>
        <artifactId>api-all</artifactId>
        <version>1.0.3</version>
    </dependency>

Here's some of the important bits:

	var pageCursor = "";  /** or some Base64 encoded byte[] cookie if I'm trying to start from where i left off last time. */
	...
	pagedSearchControl = new PagedResultsImpl();
	pagedSearchControl.setSize(pageSize);
	pagedSearchControl.setCookie(Base64.getEncoder().encodeToString(pageCursor.getBytes()));
	...
	var searchRequest = new SearchRequestImpl();
	...
	searchRequest.addControl(pagedSearchControl);
	...
	var cursor = new EntryCursorImpl(connection.search(searchRequest));
	...
	pagingResults = cursor.getSearchResultDone().getControl(PagedResults.OID);
	if (pagingResults != null){
	    nextPageCursor = Base64.getEncoder().encodeToString(pagingResults.getCookie());
	}

When run against Active Directory I can page all the users just fine. When I change my connection to point to an OpenLDAP directory I am able to search for users just fine, EXCEPT for when I set the page control cookie using a non-null value for pageCursor (one I got from base 64 encoding a previous call's cookie). Basically, I can't get the paged results from OpenLDAP. I get no results and there are no exceptions.

*   What is needed in order to get OpenLDAP to page properly?
*   Am I missing something with setting up page control in Apache Directory?
*   Is paging a setting in OpenLDAP I need to turn on?

This question has also been posted on stackoverflow: https://stackoverflow.com/questions/57632585/paginating-openldap-with-apache-directory-ldap-api

Thank you,
Jeremy

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Re: Can't paginate with OpenLDAP

[Emmanuel Lécharny <el...@gmail.com>]

Hi,

On 27/08/2019 16:19, Jeremy Sweetman wrote:
> Hi,
>
> I've successfully used the Apache Directory API to load in paged user data from Active Directory. It's similar to the example code by 'oers' found in this stackoverflow question: https://stackoverflow.com/questions/17963975/apache-directory-ldap-paged-searches
>
> Some differences I have are:
> *   I'm coding it with Nashorn (Javascript running in Java)
> *   I'm using the PagedResultsImpl class instead of PagedResultsDecorator
> *   I'm saving the cookie as a string between calls by using a Base64 encoding of the byte[] cookie.
> *   I'm using Apache Directory API with the following maven import (The links to the version 2 javadoc on the website were broken so I stuck with version 1):
>      <dependency>
>          <groupId>org.apache.directory.api</groupId>
>          <artifactId>api-all</artifactId>
>          <version>1.0.3</version>
>      </dependency>
>
> Here's some of the important bits:
>
> 	var pageCursor = "";  /** or some Base64 encoded byte[] cookie if I'm trying to start from where i left off last time. */
> 	...
> 	pagedSearchControl = new PagedResultsImpl();
> 	pagedSearchControl.setSize(pageSize);
> 	pagedSearchControl.setCookie(Base64.getEncoder().encodeToString(pageCursor.getBytes()));

Any reason you encode the empty byte[] ? Just pass Strings.EMPTY_BYTES.


> 	...
> 	var searchRequest = new SearchRequestImpl();
> 	...
> 	searchRequest.addControl(pagedSearchControl);
> 	...
> 	var cursor = new EntryCursorImpl(connection.search(searchRequest));
> 	...
> 	pagingResults = cursor.getSearchResultDone().getControl(PagedResults.OID);
> 	if (pagingResults != null){
> 	    nextPageCursor = Base64.getEncoder().encodeToString(pagingResults.getCookie());


Same thing. Don't encode using Base64.



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