[jira] [Resolved] (KAFKA-6464) Base64URL encoding under JRE 1.7 is broken due to incorrect padding assumption

["Ismael Juma (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-6464?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ismael Juma resolved KAFKA-6464.
--------------------------------
    Resolution: Fixed
      Reviewer: Rajini Sivaram  (was: Ismael Juma)

> Base64URL encoding under JRE 1.7 is broken due to incorrect padding assumption
> ------------------------------------------------------------------------------
>
>                 Key: KAFKA-6464
>                 URL: https://issues.apache.org/jira/browse/KAFKA-6464
>             Project: Kafka
>          Issue Type: Bug
>          Components: clients
>    Affects Versions: 1.0.0
>            Reporter: Ron Dagostino
>            Priority: Minor
>             Fix For: 1.1.0
>
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> The org.apache.kafka.common.utils.Base64 class defers Base64 encoding/decoding to the java.util.Base64 class beginning with JRE 1.8 but leverages javax.xml.bind.DatatypeConverter under JRE 1.7.  The implementation of the encodeToString(bytes[]) method returned under JRE 1.7 by Base64.urlEncoderNoPadding() blindly removes the last two trailing characters of the Base64 encoding under the assumption that they will always be the string "==" but that is incorrect; padding can be "=", "==", or non-existent.
> For example, this statement:
>  
> {code:java}
> Base64.urlEncoderNoPadding().encodeToString(
>     "{\"alg\":\"none\"}".getBytes(StandardCharsets.UTF_8));{code}
>  
> Yields this, which is incorrect: (because the padding on the Base64 encoded value is "=" instead of the assumed "==", so an extra character is incorrectly trimmed):
> {{eyJhbGciOiJub25lIn}}
> The correct value is:
> {{eyJhbGciOiJub25lIn0}}
> There is also no Base64.urlDecoder() method, which aside from providing useful functionality would also make it easy to write a unit test (there currently is none).
>  



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