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2     //$Header: /home/dashley/cvsrep/e3ft_gpl01/e3ft_gpl01/webprojs/fboprime/sw/phplib/perm.inc,v 1.5 2006/07/03 03:46:24 dashley Exp $
3     //--------------------------------------------------------------------------------------------------------------
4     //perm.inc--FboPrime User Permission String Processing
5     //Copyright (C) 2006 David T. Ashley
6     //
7     //This program is free software; you can redistribute it and/or
8     //modify it under the terms of the GNU General Public License
9     //as published by the Free Software Foundation; either version 2
10     //of the License, or (at your option) any later version.
11     //
12     //This program is distributed in the hope that it will be useful,
13     //but WITHOUT ANY WARRANTY; without even the implied warranty of
14     //MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15     //GNU General Public License for more details.
16     //
17     //You should have received a copy of the GNU General Public License
18     //along with this program; if not, write to the Free Software
19     //Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20     //-------------------------------------------------------------------------------------------------
21     //Copyright 2006 David T. Ashley
22     //-------------------------------------------------------------------------------------------------
23     //This source code and any program in which it is compiled/used is provided under the GNU GENERAL
24     //PUBLIC LICENSE, Version 3, full license text below.
25     //-------------------------------------------------------------------------------------------------
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577     // 13. Use with the GNU Affero General Public License.
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614     // 15. Disclaimer of Warranty.
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648     // How to Apply These Terms to Your New Programs
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650     // If you develop a new program, and you want it to be of the greatest
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674     //
675     //Also add information on how to contact you by electronic and paper mail.
676     //
677     // If the program does terminal interaction, make it output a short
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680     // <program> Copyright (C) <year> <name of author>
681     // This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
682     // This is free software, and you are welcome to redistribute it
683     // under certain conditions; type `show c' for details.
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685     //The hypothetical commands `show w' and `show c' should show the appropriate
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691     //For more information on this, and how to apply and follow the GNU GPL, see
692     //<http://www.gnu.org/licenses/>.
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694     // The GNU General Public License does not permit incorporating your program
695     //into proprietary programs. If your program is a subroutine library, you
696     //may consider it more useful to permit linking proprietary applications with
697     //the library. If this is what you want to do, use the GNU Lesser General
698     //Public License instead of this License. But first, please read
699     //<http://www.gnu.org/philosophy/why-not-lgpl.html>.
700     //-------------------------------------------------------------------------------------------------
701     //********************************************************************************
702     //This includes functions used to process user permission strings, and explains
703     //the format of permission strings (but not textual descriptions of what the
704     //variables mean or the semantics). For explanation of the semantics of the
705     //permission string variables, please see permview.inc.
706     //--------------------------------------------------------------------------------------------------------------
707     require_once("global.inc");
708     require_once("strfunc.inc");
709     //
710     //--------------------------------------------------------------------------------------------------------------
711     //Format of an individual permission:
712     // a)Begins with a single backslash.
713     // b)Followed by at least one letter of either case (parameter names are case-sensitive).
714     // c)Followed by aribitrarily many letters and numbers.
715     // d)Followed by "=".
716     // e)Followed by a quotation mark.
717     // f)Followed by the actual parameter--only spaces, letters, hyphens, periods, and numbers are allowed.
718     // The empty string is allowed.
719     // g)Concluded by another quotation mark.
720     //
721     //Format of a permission string:
722     // a)Simple concatenation of aribitrarily many individual permissions as described above.
723     //
724     //The format in general is designed for rapid search. The string functions will find parameter
725     //names quite quickly.
726     //--------------------------------------------------------------------------------------------------------------
727     //Retrieves the value of a parameter within a string, or FALSE if the parameter does not
728     //exist in the string.
729     //
730     //The permission string must be properly formatted.
731     //
732     //Unit-tested 20060427.
733     //
734     function PERM_get_val_from_string($permstring, $permname)
735     {
736     $idx = strpos($permstring, "\\" . $permname . "=");
737    
738     if ($idx === FALSE)
739     {
740     //Value not found. Indicate this to the caller with FALSE.
741     return(FALSE);
742     }
743     else
744     {
745     //Value was found.
746     $len = strlen($permstring); //Record the length for efficiency.
747    
748     //Grab the offset of the two quotes following the parameter name.
749     $q1pos = FALSE;
750     $q2pos = FALSE;
751     $q1pos = strpos($permstring, "\"", $idx);
752     if (($q1pos !== FALSE) && ($q1pos < ($len-1)))
753     $q2pos = strpos($permstring, "\"", $q1pos + 1);
754    
755     //Return the appropriate result.
756     if (($q1pos !== FALSE) && ($q2pos !== FALSE))
757     {
758     //We have a properly-quoted result. Return it.
759     return(SubStr($permstring, $q1pos+1, $q2pos-$q1pos-1));
760     }
761     else
762     {
763     //Something went wrong. Return FALSE.
764     return(FALSE);
765     }
766     }
767     }
768     //
769     //--------------------------------------------------------------------------------------------------------------
770     //Splits a permission string into its components, and returns an associative array containing the permission
771     //string names as the keys and the values as the elements.
772     //
773     //If there are no permissions in the string, returns FALSE.
774     //
775     //The string should be a properly-formatted permission string.
776     //
777     //If the are multiple entries in the string, the later value will be written
778     //over the earlier one in the associative array.
779     //
780     //Unit-tested 20060427.
781     //
782     function PERM_split_aa($arg)
783     {
784     $temp = explode("\\", $arg);
785    
786     if ($temp === FALSE)
787     {
788     return(FALSE);
789     }
790     else if (count($temp) == 0)
791     {
792     return(FALSE);
793     }
794     else
795     {
796     $putidx = 0;
797    
798     for ($i=0; $i<count($temp); $i++)
799     {
800     $val = $temp[$i];
801     $len = strlen($val);
802    
803     if ($len >= 4)
804     {
805     $q1pos = FALSE;
806     $q2pos = FALSE;
807     $q1pos = strpos($val, "\"");
808     if (($q1pos !== FALSE) && ($q1pos < ($len-1)))
809     $q2pos = strpos($val, "\"", $q1pos + 1);
810    
811     if (($q1pos !== FALSE) && ($q2pos !== FALSE) && ($q1pos >= 2))
812     {
813     $rv[SubStr($val, 0, $q1pos-1)] = SubStr($val, $q1pos+1, $q2pos-$q1pos-1);
814     $putidx++;
815     }
816     }
817     }
818    
819     //Unless we couldn't find anything seemingly valid, return the array.
820     if ($putidx > 0)
821     return($rv);
822     else
823     return(FALSE);
824     }
825     }
826     //
827     //--------------------------------------------------------------------------------------------------------------
828     //Recombines a permission string that has been split from an associative array into a permission string.
829     //No hard error checking is performed, i.e. array names with invalid characters or strings with invalid
830     //characters will slip through in the interest of speed.
831     //
832     function PERM_combine_aa($arg)
833     {
834     $rv = "";
835    
836     reset($arg);
837     while (list($key, $val) = each($arg))
838     {
839     $rv = $rv . "\\" . $key . "=\"" . $val . "\"";
840     }
841    
842     return($rv);
843     }
844     //
845     //--------------------------------------------------------------------------------------------------------------
846     //Recombines a permission string that has been split from an associative array into a permission string.
847     //All invalid characters are stripped from both key names and values (and empty keys are dropped), leading
848     //to a guaranteed valid permission string. This function is naturally slower than the function above because
849     //of the error checking.
850     //
851     function PERM_combine_aa_error_trap($arg)
852     {
853     $rv = "";
854    
855     //Since we're doing an expensive operation, might as well sort the array, too.
856     ksort($arg);
857    
858     reset($arg);
859     while (list($key, $val) = each($arg))
860     {
861     if (strlen($key) > 0) //Don't want to go further if key is empty.
862     {
863     //Force the string into numbers and letters for the key.
864     $key = STRFUNC_force_into_subset($key, "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ");
865    
866     //It is still possible that the first character is a digit, which is a no-no.
867     //Rip characters off the string until we have either a letter or an empty string.
868     while ((strlen($key) > 0) && (strpos("0123456789", SubStr($key, 0, 1)) !== FALSE))
869     {
870     $key = SubStr($key, 1, strlen($key) - 1); //Rip the character off the front.
871     }
872    
873     //If we have an empty string, don't proceed.
874     if (strlen($key) > 0)
875     {
876     //Force the value into the allowable character set.
877     $val = STRFUNC_force_into_subset($val, " abcdefghijklmnopqrstuvwxyz-.ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789");
878    
879     //Add to the string.
880     $rv = $rv . "\\" . $key . "=\"" . $val . "\"";
881     }
882     }
883     }
884    
885     return($rv);
886     }
887     //
888     //--------------------------------------------------------------------------------------------------------------
889     //Forces a permission string into valid space.
890     //
891     //This can be done inefficiently by just splitting and then recombining.
892     //
893     //Unit-tested 20060427.
894     //
895     function PERM_force_into_valid_space($arg)
896     {
897     $splitval = PERM_split_aa($arg); //Split it.
898     $rv = PERM_combine_aa_error_trap($splitval); //Recombine it.
899    
900     //Return value to caller.
901     return($rv);
902     }
903     //
904     //--------------------------------------------------------------------------------------------------------------
905     //End of $RCSfile: perm.inc,v $.
906     //--------------------------------------------------------------------------------------------------------------
907     ?>

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