Github user jvwing commented on the issue:

    https://github.com/apache/nifi/pull/1008
  
    Our current intentions are specific to S3, as are the implementation and 
tests, so I would prefer starting with S3 alone and refactoring later if/when 
there is demand for a wider option.  Also, I think we can provide a stronger 
user experience as an S3-specific field, helping users either ignore the field 
or pick an appropriate Signer class without Googling for it.  Specifically,
    
    * Provide the currently supported class names as examples in the 
description text, or
    * Present the options in a drop-down list of the S3 signers.  Something 
similar came up in another PR with respect to server-side encryption and 
enforcing signature v4, and I think a list like "Default Signature", "Signature 
v4", "Signature v2", would be nice.  No, this isn't required, but it seems like 
a nice extra for usability (via extra work for you, I admit it's feature creep).



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