Commit | Line | Data |
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920dae64 AT |
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 | } |