Restored the max_age option

Previoulsy lost in the refactor.

Port of 70103eb

See #88

Author: nitriques

README.markdown

@@ -27,6 +27,7 @@ Most of them are editable on Symphony's Preferences page.
     'disable_upscaling' => 'yes',       // yes/no (editable)
     'disable_proxy_transform' => 'yes', // yes/no (editable)
     'allow_origin' => '',               // string (editable)
+    'max_age' => null,                  // integer (hidden)
 ),
 ```
 
@@ -54,6 +55,10 @@ Setting this to 'yes' will add a HTTP header to the response telling proxies to
 
 If not empty, this value will be sent as the Cross-Origin HTTP header
 
+### max_age
+
+The value, in seconds, for the max-age specifier in the Cache-Control HTTP Header
+
 ## Updating
 
 ### 2.0.0

extension.driver.php

@@ -173,7 +173,7 @@ public function update($previousVersion = false)
             }
         }
 
-        if (version_compare($previousVersion, '2.0.0', '<')) {
+        if (version_compare($previousVersion, '2.0.1', '<')) {
             try {
                 // Re-simplify JIT htaccess rule
                 // see c7cd6183ffd15b9a8b7864df2eb29d3c1d96b5f9
@@ -191,6 +191,25 @@ public function update($previousVersion = false)
                 throw new Exception($message);
             }
         }
+
+        if (version_compare($previousVersion, '2.0.2', '<')) {
+            try {
+                $maxage = Symphony::Configuration()->get('max-age', 'image');
+                if (!empty($maxage)) {
+                    Symphony::Configuration()->set('max_age', $maxage, 'image');
+                }
+                Symphony::Configuration()->remove('max-age', 'image');
+            } catch (Exception $ex) {
+                $message = __(
+                    'An error occured while updating %s. %s',
+                    array(
+                        __('JIT Image Manipulation'),
+                        $ex->getMessage()
+                    )
+                );
+                throw new Exception($message);
+            }
+        }
     }
 
     public function uninstall()

extension.meta.xml

@@ -16,7 +16,7 @@
 		</author>
 	</authors>
 	<releases>
-		<release version="2.0.1" date="TBA" min="2.6.0" max="2.x.x">
+		<release version="2.0.2" date="TBA" min="2.6.0" max="2.x.x">
 			- Refactored all filters to eliminate duplicated code
 			- Fixed a couple of bugs (#120, #121, #106)
 			- Fixed a regression in the .htaccess rule, where the file extension was added to the RewriteRule.

lib/class.jit.php

@@ -333,8 +333,12 @@ public function sendImageHeaders($parameters)
                 $cacheControl .= ', no-transform';
             }
 
-            // Add max-age directive at the end
-            $cacheControl .= '; max-age=31536000';
+            // Use configured max-age or fallback on 3 days (See #88)
+            $maxage = isset($this->settings['max_age']) ? $this->settings['max_age'] : 86400;
+            if (!empty($maxage)) {
+                // Add max-age directive at the end
+                $cacheControl .= '; max-age=' . $maxage;
+            }
 
             header('Last-Modified: ' . $last_modified_gmt);
             header(sprintf('ETag: "%s"', $etag));