12.0 change add existing file in wiki edit (#6057)

* 12.0 change add existing file in wiki edit

* 01 delete create wiki from existing library

* 02 change click wiki name jump to edit page and delete edit icon

* 03 delete select existing file to create new page

* optimize edit wiki

* 04 old wiki page use the early version 11.x features

* optimize wiki permission

* wiki add wiki2

* delete page file

* fix wiki test

---------

Co-authored-by: ‘JoinTyang’ <yangtong1009@163.com>

frontend/src/pages/wiki2/utils/index.js

@@ -0,0 +1,46 @@
+import { serviceURL, mediaUrl } from '../../../utils/constants';
+
+const generatorBase64Code = (keyLength = 4) => {
+  let possible = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz0123456789';
+  let key = '';
+  for (let i = 0; i < keyLength; i++) {
+    key += possible.charAt(Math.floor(Math.random() * possible.length));
+  }
+  return key;
+};
+
+const generateUniqueId = (navigation, length = 4) => {
+  let idMap = {};
+  function recurseItem(item) {
+    if (!item) return;
+    idMap[item.id] = true;
+    if (Array.isArray(item.children)) {
+      item.children.forEach(item => {
+        recurseItem(item);
+      });
+    }
+  }
+  navigation.forEach(item => recurseItem(item));
+
+  let _id = generatorBase64Code(length);
+  while (idMap[_id]) {
+    _id = generatorBase64Code(length);
+  }
+  return _id;
+};
+
+const isObjectNotEmpty = (obj) => {
+  return obj && Object.keys(obj).length > 0;
+};
+
+const getIconURL = (repoId, fileName) => {
+  if (!fileName) {
+    return null;
+  }
+  if (fileName === 'default') {
+    return `${mediaUrl}img/wiki/default.png`;
+  }
+  return serviceURL + '/lib/' + repoId + '/file/_Internal/Wiki/Icon/' + fileName + '?raw=1';
+};
+
+export { generatorBase64Code, generateUniqueId, isObjectNotEmpty, getIconURL };