PartFactory uses incorrect algorithm to process folded MIME headers
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Key: AXIOM-366
URL: https://issues.apache.org/jira/browse/AXIOM-366
Project: Axiom
Issue Type: Bug
Components: API
Affects Versions: 1.2.11
Reporter: Andreas Veithen
Assignee: Andreas Veithen
Priority: Minor
Fix For: 1.2.12
This issue was originally reported here:
http://markmail.org/thread/guj44ez5wdnxjobc
AXIOM-257 introduced code into PartFactory that interprets ";" at the end of a
header line as a continuation character, i.e. as "an indication that the value
is continued on the next line". This however is not compatible with the MIME
specification and may cause issues with clients that produce multi-line headers
in conformance with the MIME specs.
Section 1 of RFC 2045 specifies that:
"All of the header fields defined in this document are subject to the general
syntactic rules for header fields specified in RFC 822."
Section 3.1.1 of RFC 822 describes how headers are folded:
"Each header field can be viewed as a single, logical line of ASCII characters,
comprising a field-name and a field-body. For convenience, the field-body
portion of this conceptual entity can be split into a multiple-line
representation; this is called "folding". The general rule is that wherever
there may be linear-white-space (NOT simply LWSP-chars), a CRLF immediately
followed by AT LEAST one LWSP-char may instead be inserted."
This means that a multi-line header should not be detected by looking for a
semicolon at the end of a line, but by looking for white-space at the beginning
of a line.
In most cases, the change introduced by AXIOM-257 produces the expected result
because for MTOM or SwA messages, the only header that has a significant
probability of being folded is the Content-Type header and RFC 822 specifies
that:
"While the standard permits folding wherever linear-white-space is permitted,
it is recommended that structured fields [...] limit folding to higher-level
syntactic breaks."
For the Content-Type header this means that folding will in general occur after
a semicolon.
However, there are rare cases where the algorithm introduced by AXIOM-257 fails
to unfold headers correctly, and the code needs to be fixed to conform to RFC
822.
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