zeroflag commented on PR #817:
URL: https://github.com/apache/knox/pull/817#issuecomment-1814635567
@lmccay
1. Thanks, I renamed it to `expression.principal.mapping`.
2. The `HadoopGroupProvider` extends from CommonIdentityProvider, so it
inherits all this functionality. I verified it with this config:
```xml
<provider>
<role>identity-assertion</role>
<name>HadoopGroupProvider</name>
<enabled>true</enabled>
<param>
<name>expression.principal.mapping</name>
<value>(concat username '_SUFFIX')</value>
</param>
<param>
<name>group.mapping.vgrp1</name>
<value>(starts-with username 'sam')</value>
</param>
<param>
<name>hadoop.security.group.mapping</name>
<value>org.apache.hadoop.security.LdapGroupsMapping</value>
</param>
<param>
<name>hadoop.security.group.mapping.ldap.url</name>
<value>ldap://localhost:33389</value>
</param>
[....]
</provider>
```
```bash
$ curl -v -k -u sam:sam-password https://localhost:8443/gateway/sandbox/hive
```
```
23/11/16 16:02:14
||4887dab7-ffa5-4d94-9343-9eedc140fd73|audit|[0:0:0:0:0:0:0:1]|HIVE|sam|sam_SUFFIX||identity-mapping|principal|sam_SUFFIX|success|Groups:
[vgrp1]
```
3. The parentheses won't cause any encoding problem. The only thing I can
think of as a problem is the greater than / less than signs. But those are
rarely used and they can be encoded.
For example:
```lisp
(> (strlen username) 10)
```
Should be encoded as:
```
(> (strlen username) 10)
```
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