Username Template Importer

[Björn Eickvonder]

Hi all,

according to the help text it is possible to use "| lowercase" or "| uppercase" in the UsernameTemplateImporter, but I don't see that this is implemented.

I could contribute that and I'd like to extend that further by 

1. a possibility to replace characters, e.g. "| replace:-_" would replace all dashes by underscore
2. a possibility to apply a regular expression with a catch group, e.g. "| regex:(.*)@.*" would be effectively a substring before @, for example to strip out the domain if email address is the user name.
3. To concatenate multiple such operators, e.g. ${CLAIM.preferred_username | uppercase | replace:-_ | regex:(.*)@.*} would transform Max.Mus...@gmx.net into MAX.MUSTER_HANS

What do you think?

[Thomas Darimont]

Hello Björn,

I think the transformations you are referring to are defined here: https://github.com/keycloak/keycloak/blob/master/services/src/main/java/org/keycloak/broker/saml/mappers/UsernameTemplateMapper.java#L94

and used here: https://github.com/keycloak/keycloak/blob/master/services/src/main/java/org/keycloak/broker/oidc/mappers/UsernameTemplateMapper.java#L167

Cheers,

Thomas

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