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/**
  @file
  @brief Returns a userid according to session context
  @details In a workspace session, a user is generally represented by <code>
    &sysuserid</code> or <code>SYS_COMPUTE_SESSION_OWNER</code> if it exists.  
    In a Stored Process session, <code>&sysuserid</code>
    resolves to a system account (default=sassrv) and instead there are several
    metadata username variables to choose from (_metauser, _metaperson
    ,_username, _secureusername).  The OS account is represented by
    <code> _secureusername</code> whilst the metadata account is under <code>
    _metaperson</code>.
 
        %let user= %mf_getUser();
        %put &user;
        
  @param type - do not use, may be deprecated in a future release
 
  @return SYSUSERID (if workspace server)
  @return _METAPERSON (if stored process server)
  @return SYS_COMPUTE_SESSION_OWNER (if Viya compute session)
 
  @version 9.2
  @author Allan Bowe
**/
 
%macro mf_getuser(type=META
)/*/STORE SOURCE*/;
  %local user metavar;
  %if &type=OS %then %let metavar=_secureusername;
  %else %let metavar=_metaperson;
 
  %if %symexist(SYS_COMPUTE_SESSION_OWNER) %then %let user=&SYS_COMPUTE_SESSION_OWNER;
  %else %if %symexist(&metavar) %then %do;
    %if %length(&&&metavar)=0 %then %let user=&sysuserid;
    /* sometimes SAS will add @domain extension - remove for consistency */
    %else %let user=%scan(&&&metavar,1,@);
  %end;
  %else %let user=&sysuserid;
 
  %quote(&user)
 
%mend;