Allow a theme to specify that it is only available as a view theme to members...

Allow a theme to specify that it is only available as a view theme to members of institutions for which the theme is the default institution theme
Signed-off-by: Richard Mansfield <richardm@catalyst.net.nz>

htdocs/lang/en.utf8/view.php

@@ -257,6 +257,8 @@ $string['noartefactstochoosefrom'] = 'Sorry, no artefacts to choose from';
 $string['access'] = 'Access';
 $string['noaccesstoview'] = 'You do not have permission to access this view';
 
+$string['changeviewtheme'] = 'The theme you have chosen for this view is no longer available to you.  Please select a different theme.';
+
 // Templates
 $string['Template'] = 'Template';
 $string['allowcopying'] = 'Allow copying';

htdocs/lib/mahara.php

@@ -525,9 +525,20 @@ function get_language_root($language=null) {
 /**
  * Return a list of available themes.
  */
-function get_themes() {
+function get_themes($all=true) {
     static $themes = null;
 
+    $institutionthemes = array();
+    if (!$all) {
+        global $USER;
+        $institutions = $USER->get('institutions');
+        foreach ($institutions as &$i) {
+            if (!empty($i->theme)) {
+                $institutionthemes[$i->theme] = 1;
+            }
+        }
+    }
+
     if (is_null($themes)) {
         $themes = array();
         $themebase = get_config('docroot') . 'theme/';
@@ -539,7 +550,9 @@ function get_themes() {
                 $config_path = $themebase . $subdir . '/themeconfig.php';
                 if (is_readable($config_path)) {
                     require($config_path);
-                    $themes[$subdir] = isset($theme->displayname) ? $theme->displayname : $subdir;
+                    if ($all || empty($theme->institution_only) || isset($institutionthemes[$subdir])) {
+                        $themes[$subdir] = isset($theme->displayname) ? $theme->displayname : $subdir;
+                    }
                 }
             }
         }

htdocs/theme/raw/templates/view/changetheme.tpl

+{include file="viewmicroheader.tpl"}
+<h1>{$PAGEHEADING}</h1>
+<div class="center">
+    <p>{str tag=changeviewtheme section=view}</p>
+    <form action="{$formurl}" method="post">
+        <input type="hidden" id="viewid" name="id" value="{$view}">
+        <label for="viewtheme-select">{str tag=theme}: </label>
+        <select id="viewtheme-select" name="viewtheme">
+            <option value="">Choose theme...</option>
+{foreach from=$viewthemes key=themeid item=themename}
+            <option value="{$themeid|escape}"{if $themeid == $viewtheme} selected="selected" style="font-weight: bold;"{/if}>{$themename|escape}</option>
+{/foreach}
+        </select>
+        <input type="submit" class="submit" value="{str tag=submit}">
+    </form>
+</div>
+
+{include file="microfooter.tpl"}

htdocs/view/blocks.php

@@ -123,6 +123,7 @@ $extraconfig = array(
 
 // Set up theme
 $viewtheme = $view->get('theme');
+$allowedthemes = get_themes(false);
 if ($viewtheme && $THEME->basename != $viewtheme) {
     $THEME = new Theme($viewtheme);
 }
@@ -133,6 +134,20 @@ foreach (array_reverse($THEME->get_url('style/style.css', true, 'artefact/file')
     $stylesheets[] = '<link rel="stylesheet" type="text/css" href="' . $sheet . '">';
 }
 
+// Tell the user to change the view theme if the current one is no
+// longer available to them.
+if (!isset($allowedthemes[$viewtheme])) {
+    $smarty = smarty(array(), $stylesheets, false, $extraconfig);
+    $smarty->assign('PAGEHEADING', hsc(TITLE));
+    $smarty->assign('formurl', get_config('wwwroot') . 'view/blocks.php');
+    $smarty->assign('view', $view->get('id'));
+    $smarty->assign('viewtitle', $view->get('title'));
+    $smarty->assign('viewtheme', $viewtheme);
+    $smarty->assign('viewthemes', $allowedthemes);
+    $smarty->display('view/changetheme.tpl');
+    exit;
+}
+
 $smarty = smarty(array('views', 'tinymce', 'paginator', 'tablerenderer', 'artefact/file/js/filebrowser.js', 'lib/pieforms/static/core/pieforms.js', 'blocktype/creativecommons/js/creativecommons.js'), $stylesheets, false, $extraconfig);
 
 // The list of categories for the tabbed interface
@@ -174,7 +189,7 @@ $smarty->assign('institution', $institution);
 $smarty->assign('can_change_layout', (!$USER->get_account_preference('addremovecolumns') || ($view->get('numcolumns') > 1 && $view->get('numcolumns') < 5)));
 
 $smarty->assign('viewtheme', $viewtheme);
-$smarty->assign('viewthemes', get_themes());
+$smarty->assign('viewthemes', $allowedthemes);
 
 $smarty->assign('viewid', $view->get('id'));
 $smarty->assign('viewtitle', $view->get('title'));