create middle ware

src/server/middlewares/certify-shared-page.js

@@ -0,0 +1,30 @@
+const loggerFactory = require('@alias/logger');
+
+const logger = loggerFactory('growi:middleware:certify-shared-page');
+
+module.exports = (crowi) => {
+
+  return async(req, res, next) => {
+    const pageId = req.query.page_id || req.body.page_id || null;
+    if (pageId == null) {
+      return next();
+    }
+
+    const ShareLink = crowi.model('ShareLink');
+    const sharelink = await ShareLink.findOne({ relatedPage: pageId });
+
+    // check sharelink enabled
+    if (sharelink == null || sharelink.isExpired()) {
+      return next();
+    }
+
+    logger.debug('shareLink id is', sharelink._id);
+
+    req.isSharedPage = true;
+
+    logger.debug('Confirmed target page id is a share page');
+
+    next();
+  };
+
+};