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https://issues.apache.org/jira/browse/MIME4J-263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16131990#comment-16131990
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ASF GitHub Bot commented on MIME4J-263:
---------------------------------------
GitHub user artur-jablonski opened a pull request:
https://github.com/apache/james-mime4j/pull/15
MIME4J-263, decoding encoded words with empty encoded-text
Even though the rfc2047 specifies that the encoded-text in encoded word
needs at least one character.
I've seen this sort of encoded words around in emails, which the
DecoderUtil.decodeEncodedWords() ignores and retuns as-is.
This pull requests changes that behaviour to return an empty string in such
cases
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/artur-jablonski/james-mime4j MIME4J-263
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/james-mime4j/pull/15.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #15
----
commit c3bc174f2c07f2be81c86710ac8415f2cbc524a3
Author: Artur Jablonski <[email protected]>
Date: 2017-08-18T09:51:40Z
MIME4J-263, decoding encoded words with empty encoded-text
----
> DecoderUtil.decodeEncodedWords() doesn't decode an encoded empty string
> -----------------------------------------------------------------------
>
> Key: MIME4J-263
> URL: https://issues.apache.org/jira/browse/MIME4J-263
> Project: James Mime4j
> Issue Type: Bug
> Components: parser (core)
> Reporter: Artur Jablonski
> Priority: Minor
>
> {{DecoderUtil.decodeEncodedWords()}} returns an unencoded string if the word
> to decode is empty.
> For example
> {{DecoderUtil.decodeEncodedWords("=?utf-8?Q??=", DecodeMonitor.SILENT)}}
> returns
> {{"=?utf-8?Q??="}}
> instead of empty string (or perhaps null)
> The problem lies in the regexp that is used behind the scenes that requires
> at least one character:
> {code}
> private static final Pattern PATTERN_ENCODED_WORD = Pattern.compile(
> "(.*?)=\\?(.+?)\\?(\\w)\\?(.+?)\\?=", Pattern.DOTALL);
> {code}
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