better handling for http post

apps/files_encryption/files/error.php

@@ -4,6 +4,10 @@ if (!isset($_)) { //also provide standalone error page
 
 	$l = OC_L10N::get('files_encryption');
 
+	if(isset($_GET['p']) && $_GET['p'] === '1') {
+		header('HTTP/1.0 404 ' . $l->t('Your private key is not valid! Maybe the your password was changed from outside.'));
+	}
+
 	// check if ajax request
 	if(!empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest') {
 		\OCP\JSON::error(array('data' => array('message' => $l->t('Your private key is not valid! Maybe the your password was changed from outside.'))));

apps/files_encryption/lib/helper.php

@@ -200,7 +200,11 @@ class Helper {
 	 */
 	public static function redirectToErrorPage() {
 		$location = \OC_Helper::linkToAbsolute('apps/files_encryption/files', 'error.php');
-		header('Location: ' . $location);
+		$post = 0;
+		if(count($_POST) > 0) {
+			$post = 1;
+		}
+		header('Location: ' . $location . '?p=' . $post);
 		exit();
 	}
 }
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