Add options to set different cache values for uploads

- allow static files to have a different max-age
- enable a max-age for non-private responses

dmometasettings.php

@@ -37,6 +37,14 @@ public function set_defaults()
         if (!get_option('dxw_members_only_max_age')) {
             add_option('dxw_members_only_max_age', 0);
         }
+
+        if (!get_option('dxw_members_only_max_age_static')) {
+            add_option('dxw_members_only_max_age_static', 0);
+        }
+
+        if (!get_option('dxw_members_only_max_age_public')) {
+            add_option('dxw_members_only_max_age_public', 86400);
+        }
     }
 
     /**

redirect.php

@@ -128,6 +128,8 @@ function dxw_members_only_referrer_in_allow_list()
     }
 
     $max_age = absint(get_option('dxw_members_only_max_age'));
+    $max_age_static = absint(get_option('dxw_members_only_max_age_static'));
+    $max_age_static = absint(get_option('dxw_members_only_max_age_public'));
 
     do_action('dxw_members_only_redirect');
     if (
@@ -155,14 +157,14 @@ function dxw_members_only_referrer_in_allow_list()
 
     // IP whitelist
     if (dxw_members_only_current_ip_in_whitelist()) {
-        header('Cache-Control: private, max-age=' . $max_age);
+        header('Cache-Control: private, max-age=' . $max_age_static);
         dxw_members_only_serve_uploads();
         return;
     }
 
     // Referrer whitelist
     if (dxw_members_only_referrer_in_allow_list()) {
-        header('Cache-Control: private, max-age=' . $max_age);
+        header('Cache-Control: private, max-age=' . $max_age_static);
         dxw_members_only_serve_uploads();
         return;
     }
@@ -204,7 +206,7 @@ function dxw_members_only_referrer_in_allow_list()
     }
 
     if ($hit) {
-        header('Cache-Control: public');
+        header('Cache-Control: public, max-age=' . $max_age_public);
         dxw_members_only_serve_uploads();
         return;
     }

settings.php

@@ -117,18 +117,39 @@ function dxw_members_only_options_page()
 
     </table>
 
-    <h3><?php _e('Max Age', 'dxwmembersonly') ?></h3>
+    <h3><?php _e('Browser Cache Max Age', 'dxwmembersonly') ?></h3>
+    <p><?php _e('A Cache-Control header will be set that prevents server caching on non-public responses, but allows browsers to cache for a maximum number of seconds.', 'dxwmembersonly') ?></p>
 
     <table class="form-table">
         <tr valign="top">
-            <th scope="row"><label for="dxw_members_only_max_age"><?php _e('Max age for cache-control header', 'dxwmembersonly') ?></label></th>
+            <th scope="row"><label for="dxw_members_only_max_age"><?php _e('Browser cache max age in seconds', 'dxwmembersonly') ?></label></th>
             <td>
                 <input type="number" min="0" step="1" name="dxw_members_only_max_age" id="dxw_members_only_max_age" value="<?php form_option('dxw_members_only_max_age') ?>" class="regular-text">
                 <span class="description">Defaults to 0 if not set.</span>
             </td>
         </tr>
     </table>
 
+    <table class="form-table">
+        <tr valign="top">
+            <th scope="row"><label for="dxw_members_only_max_age_static"><?php _e('Browser cache max age in seconds (static content)', 'dxwmembersonly') ?></label></th>
+            <td>
+                <input type="number" min="0" step="1" name="dxw_members_only_max_age_static" id="dxw_members_only_max_age_static" value="<?php form_option('dxw_members_only_max_age_static') ?>" class="regular-text">
+                <span class="description">Defaults to 0 if not set.</span>
+            </td>
+        </tr>
+    </table>
+
+    <table class="form-table">
+        <tr valign="top">
+            <th scope="row"><label for="dxw_members_only_max_age_public"><?php _e('Browser cache max age in seconds (public content)', 'dxwmembersonly') ?></label></th>
+            <td>
+                <input type="number" min="0" step="1" name="dxw_members_only_max_age_public" id="dxw_members_only_max_age_public" value="<?php form_option('dxw_members_only_max_age_public') ?>" class="regular-text">
+                <span class="description">Defaults to 86400 if not set.</span>
+            </td>
+        </tr>
+    </table>
+
     <?php submit_button() ?>
   </form>
 </div>