validate git users

github-scorer-cloud/api/user-validity.js

+const { checkUserValidity } = require("../services/fetchers/stats-fetcher");
+const blacklist = require("../services/common/blacklist");
+const { clampValue, CONSTANTS } = require("../services/common/utils");
+require("dotenv").config();
+
+
+const allowCors = fn => async (req, res) => {
+    res.setHeader('Access-Control-Allow-Credentials', true)
+    res.setHeader('Access-Control-Allow-Origin', '*')
+    // another common pattern
+    // res.setHeader('Access-Control-Allow-Origin', req.headers.origin);
+    res.setHeader('Access-Control-Allow-Methods', 'GET,OPTIONS,PATCH,DELETE,POST,PUT')
+    res.setHeader(
+      'Access-Control-Allow-Headers',
+      'X-CSRF-Token, X-Requested-With, Accept, Accept-Version, Content-Length, Content-MD5, Content-Type, Date, X-Api-Version'
+    )
+    if (req.method === 'OPTIONS') {
+      res.status(200).end()
+      return
+    }
+    return await fn(req, res)
+  }
+  
+
+// check git user exists
+const checkUserExists = async (req, res) => {
+  const { username,cache_seconds } = req.query;
+  console.log('check user validity...');
+  if (blacklist.includes(username)) {
+    return res.send(renderError("User has been blacklisted"));
+  }
+  try{
+      user=await checkUserValidity(username);
+
+      const cacheSeconds = clampValue(
+        parseInt(cache_seconds || CONSTANTS.TWO_HOURS, 10),
+        CONSTANTS.TWO_HOURS,
+        CONSTANTS.ONE_DAY,
+      );
+      res.setHeader("Cache-Control", `public, max-age=${cacheSeconds}`);
+      return res.status(200).json({user:user});
+  }catch(err){
+      console.log('Error:',err);
+      return res.status(301).json(err);
+  }
+};
+module.exports = allowCors(checkUserExists)
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