Shortcuts legacy (#2320)

Fix https://github.com/FreshRSS/FreshRSS/issues/2316

1 files changed, 36 insertions, 0 deletions

diff --git a/lib/lib_rss.php b/lib/lib_rss.php
index 3e0033a61..00b38254a 100644
--- a/lib/lib_rss.php
+++ b/lib/lib_rss.php
@@ -544,3 +544,39 @@ function base64url_decode($data) {
 function _i($icon, $url_only = false) {
 	return FreshRSS_Themes::icon($icon, $url_only);
 }
+
+
+const SHORTCUT_KEYS = array(
+			'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
+			'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
+			'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+			'F1', 'F2', 'F3', 'F4', 'F5', 'F6', 'F7', 'F8', 'F9', 'F10', 'F11', 'F12',
+			'ArrowDown', 'ArrowLeft', 'ArrowRight', 'ArrowUp', 'Backspace', 'Delete',
+			'End', 'Enter', 'Escape', 'Home', 'Insert', 'PageDown', 'PageUp', 'Space', 'Tab',
+		);
+
+function validateShortcutList($shortcuts) {
+	$legacy = array(
+			'down' => 'ArrowDown', 'left' => 'ArrowLeft', 'page_down' => 'PageDown', 'page_up' => 'PageUp',
+			'right' => 'ArrowRight', 'up' => 'ArrowUp',
+		);
+	$upper = null;
+	$shortcuts_ok = array();
+
+	foreach ($shortcuts as $key => $value) {
+		if (in_array($value, SHORTCUT_KEYS)) {
+			$shortcuts_ok[$key] = $value;
+		} elseif (isset($legacy[$value])) {
+			$shortcuts_ok[$key] = $legacy[$value];
+		} else {	//Case-insensitive search
+			if ($upper === null) {
+				$upper = array_map('strtoupper', SHORTCUT_KEYS);
+			}
+			$i = array_search(strtoupper($value), $upper);
+			if ($i !== false) {
+				$shortcuts_ok[$key] = SHORTCUT_KEYS[$i];
+			}
+		}
+	}
+	return $shortcuts_ok;
+}