| 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 |
} |
