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-rw-r--r--mod/photo.php18
1 files changed, 15 insertions, 3 deletions
diff --git a/mod/photo.php b/mod/photo.php
index 8cb82e8ff..66280cb76 100644
--- a/mod/photo.php
+++ b/mod/photo.php
@@ -224,9 +224,21 @@ function photo_init(&$a) {
}
else {
-
- header("Expires: " . gmdate("D, d M Y H:i:s", time() + (3600*24)) . " GMT");
- header("Cache-Control: max-age=" . (3600*24));
+ // The photo cache default is 1 day to provide a privacy trade-off,
+ // as somebody reducing photo permissions on a photo that is already
+ // "in the wild" won't be able to stop the photo from being viewed
+ // for this amount amount of time once it is in the browser cache.
+ // The privacy expectations of your site members and their perception
+ // of privacy where it affects the entire project may be affected.
+ // This has performance considerations but we highly recommend you
+ // leave it alone.
+
+ $cache = get_config('system','photo_cache_time');
+ if(! $cache)
+ $cache = (3600 * 24); // 1 day
+
+ header("Expires: " . gmdate("D, d M Y H:i:s", time() + $cache) . " GMT");
+ header("Cache-Control: max-age=" . $cache);
}
echo $data;