/**
* check if two directories are different
*
* @param string $a filename
* @param string $b filename
* @return bool
*/
function dir_is_different($a, $b)
{
if (substr($a, -1) == '/') {
$a = substr($a, 0, -1);
}
if (substr($b, -1) == '/') {
$b = substr($b, 0, -1);
}
$a_fns = @scandir($a);
$b_fns = @scandir($b);
if ($a_fns !== $b_fns) {
return true;
}
foreach ($a_fns as $fn) {
if ($fn == '.' || $fn == '..') {
continue;
}
if (is_dir($a . '/' . $fn) || is_dir($b . '/' . $fn)) {
if (dir_is_different($a . '/' . $fn, $b . '/' . $fn)) {
return true;
}
} else {
if (file_is_different($a . '/' . $fn, $b . '/' . $fn)) {
return true;
}
}
}
return false;
}
/**
* create and delete auto- revisions
*
* this function operates on a specific page and takes SNAPSHOT_MIN_AGE and
* SNAPSHOT_MAX_AGE into account.
* @param array $args arguments
* key 'page' is the page (i.e. page.rev)
* @return array response
* true if successful
*/
function check_auto_snapshot($args)
{
if (!isset($args['page'])) {
return response('Required argument "page" missing', 400);
}
if (!page_exists($args['page'])) {
return response('Page ' . quot($args['page']) . ' does not exist', 400);
}
$a = expl('.', $args['page']);
$revs = revisions_info(array('pagename' => $a[0], 'sort' => 'time'));
$revs = $revs['#data'];
if ($a[1] == 'head' && SNAPSHOT_MIN_AGE != 0) {
// we're dealing with a head revision and taking snapshots
// find the previous auto- revision
for ($i = 0; $i < count($revs); $i++) {
if (substr($revs[$i]['revision'], 0, 5) == 'auto-') {
// got it, check age
if (time() - $revs[$i]['time'] < SNAPSHOT_MIN_AGE) {
log_msg('debug', 'check_auto_snapshot: age is ' . (time() - $revs[$i]['time']) . ' seconds, not creating a snapshot');
break;
}
// check if different
if (dir_is_different(CONTENT_DIR . '/' . str_replace('.', '/', $args['page']), CONTENT_DIR . '/' . str_replace('.', '/', $revs[$i]['page']))) {
snapshot($args);
} else {
log_msg('debug', 'check_auto_snapshot: head is identical to ' . $revs[$i]['revision'] . ', not creating a snapshot');
}
break;
}
if ($i == count($revs) - 1) {
// no auto- revision?, create one now
snapshot($args);
}
}
}
// delete old auto- revisions
if (SNAPSHOT_MAX_AGE != 0) {
for ($i = count($revs) - 1; 0 <= $i; $i--) {
if (substr($revs[$i]['revision'], 0, 5) == 'auto-' && SNAPSHOT_MAX_AGE < time() - $revs[$i]['time']) {
log_msg('info', 'check_auto_snapshot: deleting an old snapshot');
delete_page(array('page' => $revs[$i]['page']));
$i--;
}
}
}
return response(true);
}