ua black list

@@ -39,6 +39,8 @@ exports.createApp = async(app) => {
     res.status(200).end();
   });
 
+  app.use(require('./doraemon/middleware/backlist'));
+
   const logger = global.yoho.logger;
 
   if (app.locals.devEnv) {

+const _ = require('lodash');
+const cache = global.yoho.cache.master;
+const logger = global.yoho.logger;
+
+const uaMatch = (list, ua) => {
+  let result = false;
+
+  _.each(list, (item) => {
+    let regexp;
+
+    try {
+      regexp = new RegExp(item);
+    } catch (e) {
+      logger.error(e);
+    }
+
+    if (regexp.test(ua)) {
+      result = true;
+    }
+  });
+
+  return result;
+};
+
+module.exports = async(req, res, next) => {
+  const blackKey = 'pc:limiter:ua:black';
+  const whiteKey = 'pc:limiter:ua:white';
+
+  try {
+    const results = await Promise.all([
+      cache.getAsync(blackKey),
+      cache.getAsync(whiteKey)
+    ]);
+
+    const ualist = _.concat([], ..._.map(results, args => {
+      let list = [];
+
+      try {
+        list = JSON.parse(args) || [];
+      } catch (error) {
+        logger.error(error);
+      }
+      return list;
+    }));
+
+    if (ualist.length === 0) {
+      return next();
+    }
+    const ua = req.get('User-Agent');
+
+    if (uaMatch(ualist, ua)) {
+      return res.status(200).end();
+    }
+    return next();
+  } catch (error) {
+    logger.error(error);
+    return next();
+  }
+};