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