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https://issues.apache.org/jira/browse/SHINDIG-803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12793877#action_12793877
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Nenad Nikolic commented on SHINDIG-803:
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Before reporting the same problem, I did a search and - sure enough, someone
noticed this a while ago.
Anyway, incidentally I've developed together with my colleague a similar
feature test gadget. It actually goes around this bug in Shindig, checks for
available features anyway and correctly finds what features are available
without having to use hasFeature. This gadget is appropriately called FIG
(Feature Inspection Gadget). :-)
Here's it is:
http://shonzilla.com/gadgets/fig.xml
> hasFeature does not work
> ------------------------
>
> Key: SHINDIG-803
> URL: https://issues.apache.org/jira/browse/SHINDIG-803
> Project: Shindig
> Issue Type: Bug
> Components: Java, Javascript
> Affects Versions: 1.0
> Reporter: Henning Schmiedehausen
> Attachments: SHINDIG-803.patch
>
>
> Digging through the code; I have a test gadget that displays the compliance
> level of a javascript container. It is available at
> http://henning.schmiedehausen.org/gadgets/check.xml. This loads all
> opensocial features as optional and then displays the results of
> hasFeature(), which should only be true if a feature actually exists.
> Consider me surprised, when this gadget found out that most popular
> containers already support opensocial-1.0. :-)
> The current shindig code builds an array of features from the gadget in
> RenderingContentRewriter.java:354. For all features referenced by the gadget,
> this will contain an entry with the configuration. Even for the ones that are
> optional.
> in core.io/utils.js, the hasFeature() method only tests the presence of a key
> in this array. Which is always present if a feature is referenced by the
> gadget spec. No matter whether it exists or not. It will always report the
> feature existing. As the Optional/hasFeature combo is the only way to find
> out whether a given feature requested by a gadget is actually present, I
> consider this a bug. :-)
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