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https://issues.apache.org/jira/browse/SHINDIG-580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12630636#action_12630636
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Louis Ryan commented on SHINDIG-580:
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A chain of servlet filters would certainly work as well but it would introduce 
some degree of duplication and the need to configure the filters in web.xml as 
opposed to using Guice. See attached patch for alternate.

> Authentication filter doesnt distinguish between no authentication and 
> invalid authentication
> ---------------------------------------------------------------------------------------------
>
>                 Key: SHINDIG-580
>                 URL: https://issues.apache.org/jira/browse/SHINDIG-580
>             Project: Shindig
>          Issue Type: Improvement
>          Components: Common Components (Java)
>            Reporter: Louis Ryan
>            Assignee: Louis Ryan
>         Attachments: BetterAuthErrorHandling.patch
>
>
> The current mechanism implementation does'nt allow for the distinction 
> between an unspecificed authentication mechanism and a specified but 
> malformed one. 
> Some authentication handlers may also need to initiate additional 
> authentication steps via redirects & headers before allowing further access. 

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