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One may, however, use the mod_rewrite module to write additional environment variables based on those set by mod_auth_openidc. For example to map the given_name claim to ENVOIDC_OISCLAIM_NAME_GIVEN, and similarly for family_name and middle_name, one may use the configuration 

RewriteEngine On
RewriteCond %{ENVRewriteRule .* - [E=OIDC_CLAIM_NAME_GIVEN:%{HTTP:OIDC_CLAIM_given_name}]
RewriteRule ^(.+)$.* - [E=OIDC_CLAIM_NAME_FAMILY:%{HTTP:OIDC_CLAIM_family_name}]
RewriteRule .* - [E=ENVOIDC_OISCLAIM_NAME_GIVEN:%1MIDDLE:%{HTTP:OIDC_CLAIM_middle_name}]

Note that the regular expression used in the RewriteCond must be like that shown and not capable of matching an empty string. Specifically the regular expression ^(.*)$ will not work since it matches an empty string., however, that this approach only works in the ".htaccess" context (outside of that context the rewrite rules run before the mod_auth_openidc module has had a chance to populate the CGI environment variables). You may add that configuration to the existing file .../app/webroot/.htaccess, but be aware that it will be overwritten when you next upgrade COmanage.