Github user VipinRathor commented on the issue:
https://github.com/apache/zeppelin/pull/2923
This can also be tested via REST APIs like this:
1. Login and get cookie as CaMel case user:
curl -iv -b /tmp/cookie -c /tmp/cookie --data
"userName=CaMel&password=passw0rd" -X POST http://localhost:9995/api/login
2. Access a notebook or run some paragraph using the same cookie:
curl -iv -b /tmp/cookie -c /tmp/cookie
http://localhost:9995/api/notebook/2D9Q95A3K
3. Operation will be allowed with following debug log message:
DEBUG [2018-04-12 08:33:20,274] ({qtp2146608740-19 -
/api/notebook/2D9Q95A3K} SecurityUtils.java[getPrincipal]:105) - converting
principal name CaMel to lower case:camel
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