| 1 | #!/usr/local/bin/perl |
| 2 | |
| 3 | use CGI; |
| 4 | $query = new CGI; |
| 5 | |
| 6 | print $query->header; |
| 7 | print $query->start_html("Save and Restore Example"); |
| 8 | print "<H1>Save and Restore Example</H1>\n"; |
| 9 | |
| 10 | # Here's where we take action on the previous request |
| 11 | &save_parameters($query) if $query->param('action') eq 'SAVE'; |
| 12 | $query = &restore_parameters($query) if $query->param('action') eq 'RESTORE'; |
| 13 | |
| 14 | # Here's where we create the form |
| 15 | print $query->start_multipart_form; |
| 16 | print "Popup 1: ",$query->popup_menu('popup1',[qw{red green purple magenta orange chartreuse brown}]),"\n"; |
| 17 | print "Popup 2: ",$query->popup_menu('popup2',[qw{lion tiger bear zebra potto wildebeest frog emu gazelle}]),"\n"; |
| 18 | print "<P>"; |
| 19 | $default_name = $query->remote_addr . '.sav'; |
| 20 | print "Save/restore state from file: ",$query->textfield('savefile',$default_name),"\n"; |
| 21 | print "<P>"; |
| 22 | print $query->submit('action','SAVE'),$query->submit('action','RESTORE'); |
| 23 | print "<P>",$query->defaults; |
| 24 | print $query->endform; |
| 25 | |
| 26 | # Here we print out a bit at the end |
| 27 | print $query->end_html; |
| 28 | |
| 29 | sub save_parameters { |
| 30 | local($query) = @_; |
| 31 | local($filename) = &clean_name($query->param('savefile')); |
| 32 | if (open(FILE,">$filename")) { |
| 33 | $query->save(FILE); |
| 34 | close FILE; |
| 35 | print "<STRONG>State has been saved to file $filename</STRONG>\n"; |
| 36 | print "<P>If you remember this name you can restore the state later.\n"; |
| 37 | } else { |
| 38 | print "<STRONG>Error:</STRONG> couldn't write to file $filename: $!\n"; |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | sub restore_parameters { |
| 43 | local($query) = @_; |
| 44 | local($filename) = &clean_name($query->param('savefile')); |
| 45 | if (open(FILE,$filename)) { |
| 46 | $query = new CGI(FILE); # Throw out the old query, replace it with a new one |
| 47 | close FILE; |
| 48 | print "<STRONG>State has been restored from file $filename</STRONG>\n"; |
| 49 | } else { |
| 50 | print "<STRONG>Error:</STRONG> couldn't restore file $filename: $!\n"; |
| 51 | } |
| 52 | return $query; |
| 53 | } |
| 54 | |
| 55 | |
| 56 | # Very important subroutine -- get rid of all the naughty |
| 57 | # metacharacters from the file name. If there are, we |
| 58 | # complain bitterly and die. |
| 59 | sub clean_name { |
| 60 | local($name) = @_; |
| 61 | unless ($name=~/^[\w\._\-]+$/) { |
| 62 | print "<STRONG>$name has naughty characters. Only "; |
| 63 | print "alphanumerics are allowed. You can't use absolute names.</STRONG>"; |
| 64 | die "Attempt to use naughty characters"; |
| 65 | } |
| 66 | return "WORLD_WRITABLE/$name"; |
| 67 | } |