$_REQUEST['title'] = pieGetOption($_REQUEST['title']);
$_REQUEST['comment'] = pieGetOption($_REQUEST['comment']);
} elseif (file_exists($preview)) {
// Read source and meta data from temporary preview file.
if (!($dump = file_get_contents($preview))) {
pieError("SourceReadError");
}
$meta = pieExplodePage($dump);
foreach (array('source', 'title', 'comment') as $i) {
$_REQUEST[$i] = $meta[$i];
}
unset($meta);
} elseif ($page->exists($_REQUEST['page'])) {
// The page already exists. Use and edit the existing source.
$diff = new Increment();
if (!($meta = $diff->readPage($_REQUEST['page'], $_REQUEST['stamp']))) {
pieError("SourceVersionMissing");
}
$_REQUEST['source'] = $meta['source'];
if ($_REQUEST['section'] > 0) {
$section = new Section();
// Extract the specified section.
if (($_REQUEST['source'] = $section->extract($meta['source'], $_REQUEST['section'])) === false) {
pieError('SectionNotFound');
}
}
if ($meta['type'] == "alias") {
// The existing page is an alias.
if ($_REQUEST['overwrite']) {
// Replace the alias by a new page.
$_REQUEST['source'] = '';
$_REQUEST['page'] = pieGetOption(@$_REQUEST['page']);
$_REQUEST['old'] = intval(@$_REQUEST['old']);
$_REQUEST['new'] = intval(@$_REQUEST['new']);
if (!@$_REQUEST['sort']) {
$_REQUEST['sort'] = 'descending';
}
$page = new Page();
if (!$page->isValidName(@$_REQUEST['page'])) {
pieError('PageNameInvalid');
}
if (!$page->exists(@$_REQUEST['page'])) {
pieError('PageNotFound');
}
if (@$_REQUEST['old'] > 0 && @$_REQUEST['new'] > 0) {
$diff = new Increment();
if (!($old = $diff->readPage($_REQUEST['page'], $_REQUEST['old']))) {
pieError('SourceVersionMissing');
}
if (!($new = $diff->readPage($_REQUEST['page'], $_REQUEST['new']))) {
pieError('SourceVersionMissing');
}
$cache = new Cache();
$cid = $cache->key('diff', array('old' => $_REQUEST['old'], 'new' => $_REQUEST['new']));
if ($GLOBALS['pie']['query_caching'] && $cache->exists($cid)) {
// Use existing cache.
$data = file_get_contents($cache->file($cid));
$cache->update($cid);
} else {
// Create diff from two versions.
if (!($data = $diff->diff($old['source'], $new['source']))) {
pieError('DiffError');
