perl5.005_03

1 files changed, 67 insertions, 0 deletions

diff --git a/gnu/usr.bin/perl/eg/cgi/save_state.cgi b/gnu/usr.bin/perl/eg/cgi/save_state.cgi
new file mode 100644
index 00000000000..be79051bd64
--- /dev/null
+++ b/gnu/usr.bin/perl/eg/cgi/save_state.cgi
@@ -0,0 +1,67 @@
+#!/usr/local/bin/perl
+
+use CGI;
+$query = new CGI;
+
+print $query->header;
+print $query->start_html("Save and Restore Example");
+print "<H1>Save and Restore Example</H1>\n";
+
+# Here's where we take action on the previous request
+&save_parameters($query)              if $query->param('action') eq 'SAVE';
+$query = &restore_parameters($query)  if $query->param('action') eq 'RESTORE';
+
+# Here's where we create the form
+print $query->startform;
+print "Popup 1: ",$query->popup_menu('popup1',[qw{red green purple magenta orange chartreuse brown}]),"\n";
+print "Popup 2: ",$query->popup_menu('popup2',[qw{lion tiger bear zebra potto wildebeest frog emu gazelle}]),"\n";
+print "<P>";
+$default_name = $query->remote_addr . '.sav';
+print "Save/restore state from file: ",$query->textfield('savefile',$default_name),"\n";
+print "<P>";
+print $query->submit('action','SAVE'),$query->submit('action','RESTORE');
+print "<P>",$query->defaults;
+print $query->endform;
+
+# Here we print out a bit at the end
+print $query->end_html;
+
+sub save_parameters {
+    local($query) = @_;
+    local($filename) = &clean_name($query->param('savefile'));
+    if (open(FILE,">$filename")) {
+	$query->save(FILE);
+	close FILE;
+	print "<STRONG>State has been saved to file $filename</STRONG>\n";
+	print "<P>If you remember this name you can restore the state later.\n";
+    } else {
+	print "<STRONG>Error:</STRONG> couldn't write to file $filename: $!\n";
+    }
+}
+
+sub restore_parameters {
+    local($query) = @_;
+    local($filename) = &clean_name($query->param('savefile'));
+    if (open(FILE,$filename)) {
+	$query = new CGI(FILE);  # Throw out the old query, replace it with a new one
+	close FILE;
+	print "<STRONG>State has been restored from file $filename</STRONG>\n";
+    } else {
+	print "<STRONG>Error:</STRONG> couldn't restore file $filename: $!\n";
+    }
+    return $query;
+}
+
+
+# Very important subroutine -- get rid of all the naughty
+# metacharacters from the file name. If there are, we
+# complain bitterly and die.
+sub clean_name {
+   local($name) = @_;
+   unless ($name=~/^[\w\._\-]+$/) {
+      print "<STRONG>$name has naughty characters.  Only ";
+      print "alphanumerics are allowed.  You can't use absolute names.</STRONG>";
+      die "Attempt to use naughty characters";
+   }
+   return "WORLD_WRITABLE/$name";
+}