[jira] [Created] (NUTCH-2634) Some links marked as "nofollow" are followed anyway.

["Gerard Bouchar (JIRA)" <ji...@apache.org>]

Gerard Bouchar created NUTCH-2634:
-------------------------------------

             Summary: Some links marked as "nofollow" are followed anyway.
                 Key: NUTCH-2634
                 URL: https://issues.apache.org/jira/browse/NUTCH-2634
             Project: Nutch
          Issue Type: Bug
            Reporter: Gerard Bouchar


In order to check if an outlink in an <a> tag can be followed, nutch checks whether the value of its rel attribute is the exact string string "nofollow".
However, the rel attribute can contain a list of link types, all of which should be respected.

So nutch rightfully doesn't follow a link like:
{code:html}
<a href='top-secret.html' rel="nofollow">DO NOT FOLLOW THIS LINK</a>
{code}

but wrongfully follows :
{code:html}
<a href='top-secret.html' rel="nofollow noreferrer">DO NOT FOLLOW THIS LINK</a>
{code}

Because of the code duplication in nutch's html parsers, this should be fixed in two places:
# [parse/html/DOMContentUtils.java|https://github.com/apache/nutch/blob/3ada351a26b653b307c19e25b17e0e611a9bd59a/src/plugin/parse-html/src/java/org/apache/nutch/parse/html/DOMContentUtils.java#L437]
# [parse/tika/DOMContentUtils.java|https://github.com/apache/nutch/blob/f02110f42c53e77450835776cf41f22c23f030ec/src/plugin/parse-tika/src/java/org/apache/nutch/parse/tika/DOMContentUtils.java#L410]



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