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