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Bug 335506

Summary:	Migration of user right data
Product:	[ECD] Orion	Reporter:	John Arthorne <john.arthorne>
Component:	Client	Assignee:	John Arthorne <john.arthorne>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	P3	CC:	Szymon.Brandys
Version:	0.2
Target Milestone:	0.2
Hardware:	PC
OS:	Windows 7
Whiteboard:

Description John Arthorne

2011-01-26 15:22:43 EST

In bug 335440 we had an example of a breaking change to the user authentication data. I suspect this isn't the last time we will need to alter the format, so we should have a mechanism in place to handle migration of the data. I suggest:

 - Also write a property "UserRightsVersion" for each user with a simple integer value
 - AuthorizationService class reads the version, and delegates to a separate class to read the authorization data from preferences into a JSONObject (AuthorizationReaderV1, AuthorizationReaderV2, etc)
 - AuthorizationService always writes data in the "latest" format and sets the UserRightsVersion property to the latest version number.

Comment 1 John Arthorne

2011-01-26 16:05:26 EST

Although we could probably get away with no migration this time, it is a good opportunity to get that infrastructure in place now.

Comment 2 John Arthorne

2011-01-26 16:34:47 EST

I have released migration support for the "old" M4 format and the current format.