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- #!/usr/local/bin/perl
-
- use CGI;
- $query = new CGI;
-
- print $query->header;
- print $query->start_html("Save and Restore Example");
- print "<H1>Save and Restore Example</H1>\n";
-
- # Here's where we take action on the previous request
- &save_parameters($query) if $query->param('action') eq 'SAVE';
- $query = &restore_parameters($query) if $query->param('action') eq 'RESTORE';
-
- # Here's where we create the form
- print $query->start_multipart_form;
- print "Popup 1: ",$query->popup_menu('popup1',[qw{red green purple magenta orange chartreuse brown}]),"\n";
- print "Popup 2: ",$query->popup_menu('popup2',[qw{lion tiger bear zebra potto wildebeest frog emu gazelle}]),"\n";
- print "<P>";
- $default_name = $query->remote_addr . '.sav';
- print "Save/restore state from file: ",$query->textfield('savefile',$default_name),"\n";
- print "<P>";
- print $query->submit('action','SAVE'),$query->submit('action','RESTORE');
- print "<P>",$query->defaults;
- print $query->endform;
-
- # Here we print out a bit at the end
- print $query->end_html;
-
- sub save_parameters {
- local($query) = @_;
- local($filename) = &clean_name($query->param('savefile'));
- if (open(FILE,">$filename")) {
- $query->save(FILE);
- close FILE;
- print "<STRONG>State has been saved to file $filename</STRONG>\n";
- print "<P>If you remember this name you can restore the state later.\n";
- } else {
- print "<STRONG>Error:</STRONG> couldn't write to file $filename: $!\n";
- }
- }
-
- sub restore_parameters {
- local($query) = @_;
- local($filename) = &clean_name($query->param('savefile'));
- if (open(FILE,$filename)) {
- $query = new CGI(FILE); # Throw out the old query, replace it with a new one
- close FILE;
- print "<STRONG>State has been restored from file $filename</STRONG>\n";
- } else {
- print "<STRONG>Error:</STRONG> couldn't restore file $filename: $!\n";
- }
- return $query;
- }
-
-
- # Very important subroutine -- get rid of all the naughty
- # metacharacters from the file name. If there are, we
- # complain bitterly and die.
- sub clean_name {
- local($name) = @_;
- unless ($name=~/^[\w\._\-]+$/) {
- print "<STRONG>$name has naughty characters. Only ";
- print "alphanumerics are allowed. You can't use absolute names.</STRONG>";
- die "Attempt to use naughty characters";
- }
- return "WORLD_WRITABLE/$name";
- }
-