OmeroSessions Umbrella ticket

[jamoore]

For milestone:3.0-Beta3 the Omero server will gain a session mechanism to replace JAAS for authentication and authorization. This is primarily due the login overhead per method call, but several other benefits are gained:

• A persistent location for information such as umask, client agent name, etc.
• Ability to create temporary logins for batch processing or URL links
• Timeouts

This ticket subsumes the following:

• #297 - An extra method on the session service should allow guest login
  • It is still unclear which methods should allow the "guest" role
• #416 - umask will now be handled via the session service
• #486 - Throttling; though not necessarily completed with this ticket, the hooks for throttling individual users or groups, should be in place.
• #585 - The login module will no longer throw PSQLExceptions or similar
• #621 - Having this functionality in a service will also make it available to blitz]
• #664 - No longer needed with persistent sessions.
• #665 - Will consider adding @PermitAll, especially for guest support.
• ... more to come ...

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See also : #772

[jmoore]

Implemented with a range of commits from a git branch. Commit between r2116 and r2149.