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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LANG-1400) StringUtils: Add method for masking strings
Date Sun, 24 Jun 2018 17:15:00 GMT

    [ https://issues.apache.org/jira/browse/LANG-1400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16521550#comment-16521550
] 

ASF GitHub Bot commented on LANG-1400:
--------------------------------------

Github user greenman18523 commented on the issue:

    https://github.com/apache/commons-lang/pull/335
  
    Hello @stokito, as mentioned in #332, would you consider an extra parameter, to clearly
specify the minimum number of masked characters?
    From your implementation I can see that it is enforced, but it is limited, and it is not
documented clearly either in the javadoc or by the parameter names.
    
    The extra parameter can also make the method not being implicit on the unmasking of start/end
(``// we prefer to unmask from start and mask end if str len is smaller``) and choose to equally
subtract from ``unmaskedStart`` and ``unmaskedEnd`` to enforce the minimum amount of masked
characters.
    



> StringUtils: Add method for masking strings
> -------------------------------------------
>
>                 Key: LANG-1400
>                 URL: https://issues.apache.org/jira/browse/LANG-1400
>             Project: Commons Lang
>          Issue Type: Improvement
>          Components: lang.*
>            Reporter: Sergey Ponomarev
>            Priority: Minor
>
> It would be great to have a function which allows to mask the original str by replacing
it's
> characters with the specified character-mask. For eaxmple to mask credit card:
> {code}
> mask("3566002020360505", 4, 4, '*') = "3566********0505"
> {code}
> Thus the number was hidden by asterisks while first and last four digits are unmasked
and seen.
> Common use case is to hide sensitive information from logs, by using it in toString()
of classes or in inputs to log calls.
> I think this is "must have" functionality for Commons Lang library because from my experience
in almost all bit projects what I saw was their home grown masking function.
> I think this is very important also because this is required for masking credit card
numbers by PCI compliance. Also new GDPR rules requires to hide personal info as much as possible
so masking of First and Last names now is required by laws.
> To make the world safer place the utility for masking should be already existing in platform
to avoid situations when developer think  "this is better to mask but I don't have enough
time now so let's do this latter" until leak happens.
> IMHO this should be implemented even in `String` class itself.
> From my experience what I saw was usually few masking usages and styles:
> 1. masking of passwords and names: only first and last symbols are shown, mask char is
`*`
> 2. masking of credit cards: only first and last 4 or 6 symbols are shown, mask char is
`*`.
> 3. credit card number shortest masking of last symbols i.e. `mask("4242424242424242")
== " *4242"` but it's not so often used, I just wanted to mention.
> 4. not masking but showing a length just so see that value was passed. This can be easily
achieved by usual `String.legth()` method.
> There is already some pull request [https://github.com/apache/commons-lang/pull/332]
but I decided to create the ticket because we also need to support masking for ToStringBuilder
and I would like to propose [PR with my own implementation of mask() function|https://github.com/apache/commons-lang/pull/335].
> If you accept my PR then I'll send another one with a new annotation @ToStringMasked
in accordance to [@ToStringExclude|https://commons.apache.org/proper/commons-lang/apidocs/org/apache/commons/lang3/builder/ToStringExclude.html]
which will mark that fields should be masked. Possible usage I see like:
> {code}
> @ToStringMasked(unmaskedStart = 4, unmaskedEnd = 4) 
> String creditCardNumber;
> @ToStringMasked(unmaskedStart = 1, unmaskedEnd = 1) 
> String password;
> {code}
>  



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