web/src/main/java/org/springframework/security/web/authentication/switchuser/SwitchUserFilter.java
private Authentication getSourceAuthentication(Authentication current) {
		Authentication original = null;

		// iterate over granted authorities and find the 'switch user' authority
		Collection<? extends GrantedAuthority> authorities = current.getAuthorities();

		for (GrantedAuthority auth : authorities) {
			// check for switch user type of authority
			if (auth instanceof SwitchUserGrantedAuthority) {
				original = ((SwitchUserGrantedAuthority) auth).getSource();
				this.logger.debug("Found original switch user granted authority ["
						+ original + "]");
			}
		}

		return original;
	}
private Authentication getSourceAuthentication(Authentication current) {
		Authentication original = null;

		// iterate over granted authorities and find the 'switch user' authority
		Collection<? extends GrantedAuthority> authorities = current.getAuthorities();

		for (GrantedAuthority auth : authorities) {
			// check for switch user type of authority
			if (auth instanceof SwitchUserGrantedAuthority) {
				original = ((SwitchUserGrantedAuthority) auth).getSource();
				this.logger.debug("Found original switch user granted authority ["
						+ original + "]");
			}
		}

		return original;
	}
private Authentication getSourceAuthentication ( Authentication current ) { Authentication original = null ; // iterate over granted authorities and find the 'switch user' authority Collection < ? extends GrantedAuthority > authorities = current . getAuthorities ( ) ; for ( GrantedAuthority auth : authorities ) { // check for switch user type of authority if ( auth instanceof SwitchUserGrantedAuthority ) { original = ( ( SwitchUserGrantedAuthority ) auth ) . getSource ( ) ; this . logger . debug ( "Found original switch user granted authority [" + original + "]" ) ; } } return original ; }
Find the original <code>Authentication</code> object from the current user's
granted authorities. A successfully switched user should have a
<code>SwitchUserGrantedAuthority</code> that contains the original source user
<code>Authentication</code> object.

@param current The current <code>Authentication</code> object

@return The source user <code>Authentication</code> object or <code>null</code>
otherwise.
Find the original <code > Authentication< / code > object from the current user s granted authorities . A successfully switched user should have a <code > SwitchUserGrantedAuthority< / code > that contains the original source user <code > Authentication< / code > object .