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Currently, the source code is not distributed in the jar, however the source is in svn. The following lists the contents of the current jars, and current versions.
Current code is at SVN:
https://mware.ucdavis.edu/svn/sakai/distauth/trunk/DISTAUTHSOURCE/CurrentVersions/DISTAUTH1.0.2WithWrapperSrc/
DistAuthFilterAndWrapper1.0.0.jar (formerly known as DistAuthFilterAndWrapper.jar)
First iteration of servlet filter and wrapper in one jar.
DistAuthFilterAndWrapper1.0.1.jar (formerly known as DistAuthModified.jar)
Update to wrapper class, which includes referencing the private user variable instead of the session variable. This fixed Firefox browser issues.
DistAuthFilterAndWrapper1.0.2.jar
Update to DistAuth code, including removing synchronized methods from various classes.