Commit | Line | Data |
54310121 |
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 $query->startform; |
16 | print "Popup 1: ",$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 | } |