Andreas Veithen created AXIS2-5308:
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Summary: Attachments semantics are different for incoming and
outgoing messages
Key: AXIS2-5308
URL: https://issues.apache.org/jira/browse/AXIS2-5308
Project: Axis2
Issue Type: Bug
Components: kernel
Affects Versions: 1.6.2
Reporter: Andreas Veithen
Priority: Minor
The message builders for MTOM and SwA both initialize the message context with
an Attachments object that contains all MIME parts, including the root part. On
the other hand, the corresponding message formatters have different
expectations. The message formatter for MTOM doesn't look at the Attachments
object in the message context because attachments are referenced by special
OMText instances in the SOAP envelope. Finally, the message formatter for SwA
assumes that the Attachments object in the message context only contains the
attachment parts.
This means that for MTOM and SwA messages, the message context is set up
differently for incoming and outgoing messages. Such inconsistencies in the API
are not only annoying, but they also cause subtile issues in Synapse which
needs to be able to forward messages, i.e. transform incoming into outgoing
messages. One such issue is described in SYNAPSE-867.
The proposal is to change the semantics for incoming messages, such that they
match the current semantics for outgoing messages. In practice this means:
1. The Attachments object in the message context would no longer be set for
MTOM messages. In fact, code that attempts to directly access the MIME parts of
an MTOM message is broken by definition, because the sender is free to choose
which base64Binary elements are sent as attachments and which ones are inlined.
2. The message builder for SwA would remove the root part from the Attachments
object before adding it to the message context, so that application code only
sees attachments parts. In fact, there is no valid use case where application
code would want to retrieve the SOAP part directly from the Attachments object.
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