[jira] Created: (ABDERA-225) At ("@") and colon (":") in path segments should not be escaped by IRI.normalize()

[JIRA]

At ("@") and colon (":") in path segments should not be escaped by 
IRI.normalize()
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                 Key: ABDERA-225
                 URL: https://issues.apache.org/jira/browse/ABDERA-225
             Project: Abdera
          Issue Type: Bug
    Affects Versions: 0.4.0
            Reporter: Niklas Lindström


The `normalize` method on IRI objects escapes ":" and "@" in path segments, 
which doesn't seem to comply with the ABNF rules given in the IRI RFC (RFC 3987 
section 2.2. <http://tools.ietf.org/html/rfc3987#section-2.2>).

It seems that `isegment` explicitly *allows* for ":" and "@", according to:

    isegment       = *ipchar
    ...
    ipchar         = iunreserved / pct-encoded / sub-delims / ":" / "@"

The `normalize` method encodes each segment by filtering on 
`CharUtils.Profile.IPATHNODELIMS`, via `CharUtils.is_ipathnodelims`, which uses 
`is_ipath` && `!isGenDelim`.

The effect is that this (groovy):

    import org.apache.abdera.i18n.iri.IRI
    println new IRI("http://example.org/publ/1999:175";).normalize()
    println new IRI("http://example.org/people/ad...@example.org";).normalize()

prints out:

    http://example.org/publ/1999%3A175
    http://example.org/people/admin%40example.org

, where I would expect no escaping at all. Note that:

    println new java.net.URI("http://example.org/publ/1999:175";).normalize()
    println new 
java.net.URI("http://example.org/people/ad...@example.org";).normalize()

results in the expected:

    http://example.org/publ/1999:175
    http://example.org/people/ad...@example.org

Since an ipath is composed of "/"-separated isegments (with some specifics 
regarding absolute, rootless and noscheme), perhaps a solution would be to 
rework `is_ipath` into calls fully mimicking these ABNF rules, and use 
`UrlEncoding.encode(..., Profile.IPATH.filter())` in `IRI.normalize(path)`?



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