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https://issues.apache.org/jira/browse/DIRSHARED-143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13489369#comment-13489369
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Hendy Irawan commented on DIRSHARED-143:
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LdapEncoder.filterEncode("sm*sh") => sm\2ash

There is Apache 2.0 Licensed implementation here : 
http://www.jarvana.com/jarvana/view/org/springframework/ldap/spring-ldap/1.3.0.RELEASE/spring-ldap-1.3.0.RELEASE-sources.jar!/org/springframework/ldap/core/LdapEncoder.java?format=ok

also with a few more useful encoding/decoding methods.

Is it okay to incorporate it from legal perspective?

I can make a patch that simply copies it verbatim, with a simple test. Just 
name the artifact/package/className.

Thank you.
                
> Provide helper method to escape characters to be used in LDAP Filter literal
> ----------------------------------------------------------------------------
>
>                 Key: DIRSHARED-143
>                 URL: https://issues.apache.org/jira/browse/DIRSHARED-143
>             Project: Directory Shared
>          Issue Type: Improvement
>    Affects Versions: 1.0.0-M13
>            Reporter: Hendy Irawan
>
> In order to prevent malicious injection, user-provided input must be escaped 
> (the 5 restricted characters) before being put in LDAP filter.
> Provide a helper static method to make it convenient and available as public 
> API.

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