Add button to delete current public key

This will delete the current mnet key and regenerate a new one

Bug #890583

Change-Id: Ic07fc3f2e772fc26c959cd00a74bd88da9277a92
Signed-off-by: Hugh Davenport <hugh@catalyst.net.nz>

htdocs/admin/site/networking.php

@@ -107,6 +107,11 @@ $networkingform = pieform(
             'submit' => array(
                 'type'  => 'submit',
                 'value' => get_string('savechanges','admin')
+            ),
+            'deletesubmit' => array(
+                'type'  => 'submit',
+                'title' => get_string('deletekey', 'admin'),
+                'value' => get_string('delete')
             )
         )
     )
@@ -122,6 +127,17 @@ function networkingform_fail(Pieform $form) {
 function networkingform_submit(Pieform $form, $values) {
     $reply = '';
 
+    if (isset($values['deletesubmit'])) {
+        global $SESSION;
+        $openssl = OpenSslRepo::singleton();
+        $openssl->get_keypair(true);
+        $SESSION->add_info_msg(get_string('keydeleted', 'admin'));
+        // Using cancel here as a hack to get it to redirect so it shows the new keys
+        $form->reply(PIEFORM_CANCEL, array(
+            'location'    => get_config('wwwroot') . 'admin/site/networking.php'
+        ));
+    }
+
     if (get_config('enablenetworking') != $values['enablenetworking']) {
         if (!set_config('enablenetworking', $values['enablenetworking'])) {
             networkingform_fail($form);

htdocs/lang/en.utf8/admin.php

@@ -394,6 +394,8 @@ $string['promiscuousmodeenabled'] = 'Auto-register has been enabled. ';
 $string['promiscuousmodedescription'] = 'Create an institution record for any host that connects to you, and allow its users to log on to Mahara';
 $string['wwwroot'] = 'WWW Root';
 $string['wwwrootdescription'] = 'This is the URL at which your users access this Mahara installation, and the URL the SSL keys are generated for';
+$string['deletekey'] = 'Delete this key';
+$string['keydeleted'] = 'Public key has been deleted and regenerated';
 $string['proxysettings'] = 'Proxy settings';
 $string['proxyaddress'] = 'Proxy address';
 $string['proxyaddressdescription'] = 'If your site uses a proxy server to access the internet, specify the proxies in <em>hostname:portnumber</em> notation';