Shortcuts legacy (#2320)

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

app/Controllers/configureController.php

@@ -166,30 +166,16 @@ class FreshRSS_configure_Controller extends Minz_ActionController {
 	 * tab and up.
 	 */
 	public function shortcutAction() {
-		$list_keys = array('a', 'b', 'backspace', 'c', 'd', 'delete', 'down', 'e', 'end', 'enter',
-		                   'escape', 'f', 'g', 'h', 'home', 'i', 'insert', 'j', 'k', 'l', 'left',
-		                   'm', 'n', 'o', 'p', 'page_down', 'page_up', 'q', 'r', 'return', 'right',
-		                   's', 'space', 't', 'tab', 'u', 'up', 'v', 'w', 'x', 'y',
-		                   'z', 'f1', 'f2', 'f3', 'f4', 'f5', 'f6', 'f7', 'f8', 'f9',
-		                   'f10', 'f11', 'f12', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0');
-		$this->view->list_keys = $list_keys;
+		$this->view->list_keys = SHORTCUT_KEYS;
 
 		if (Minz_Request::isPost()) {
-			$shortcuts = Minz_Request::param('shortcuts');
-			$shortcuts_ok = array();
-
-			foreach ($shortcuts as $key => $value) {
-				if (in_array($value, $list_keys)) {
-					$shortcuts_ok[$key] = $value;
-				}
-			}
-
-			FreshRSS_Context::$user_conf->shortcuts = $shortcuts_ok;
+			FreshRSS_Context::$user_conf->shortcuts = validateShortcutList(Minz_Request::param('shortcuts'));
 			FreshRSS_Context::$user_conf->save();
 			invalidateHttpCache();
 
-			Minz_Request::good(_t('feedback.conf.shortcuts_updated'),
-			                   array('c' => 'configure', 'a' => 'shortcut'));
+			Minz_Request::good(_t('feedback.conf.shortcuts_updated'), array('c' => 'configure', 'a' => 'shortcut'));
+		} else {
+			FreshRSS_Context::$user_conf->shortcuts = validateShortcutList(FreshRSS_Context::$user_conf->shortcuts);
 		}
 
 		Minz_View::prependTitle(_t('conf.shortcut.title') . ' · ');

app/views/helpers/javascript_vars.phtml

@@ -1,6 +1,6 @@
 <?php
 $mark = FreshRSS_Context::$user_conf->mark_when;
-$s = FreshRSS_Context::$user_conf->shortcuts;
+$s = validateShortcutList(FreshRSS_Context::$user_conf->shortcuts);
 echo htmlspecialchars(json_encode(array(
 	'context' => array(
 		'anonymous' => !FreshRSS_Auth::hasAccess(),

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;
+}