moved some functions out of server

extra_modules/unsign.js

@@ -0,0 +1,47 @@
+const signature = require('cookie-signature')
+const fs = require('fs');
+const cookiesecret = fs.readFileSync("cookiesecret.txt").toString()
+/**
+ * usignes a string
+ * @param  {string} text               text to unsign
+ * @param  {request} req                request object, used for getting the ip for unsigning
+ * @param  {response} res                response object
+ * @return {string/boolean}      unsigned text, or if unsigning was unsuccessful, false
+ */
+function unsign(text,req,res) {
+  let ip = req.socket.remoteAddress
+  let unsigned = signature.unsign(text,cookiesecret+ip)
+  if(!unsigned) {
+    return false
+  }
+  return unsigned
+}
+
+/**
+ * unsignes the auth cookie of a request, also sends json response if auth cookie was invalid
+ * @param  {request} req               request object
+ * @param  {response} res               response object
+ * @return {string/boolean}     unsigned cookie, or if unsigning was unsuccessful, false
+ */
+function getunsigned(req,res) {
+  let cookie = req.cookies.AUTH_COOKIE
+  if(!cookie){
+    res.status(400)
+    res.json({"error":"you are not logged in! (no cookie)"})
+    return
+  }
+  let unsigned = unsign(cookie,req,res)
+  if(!unsigned){
+    try {
+      res.status(400)
+      res.json({"error":"Bad auth cookie set"})
+    } catch (ignored) {} //sometimes it errors, gotta debug soon
+    return false
+  }
+  return decodeURIComponent(unsigned)
+}
+
+module.exports = {
+  unsign: unsign,
+  getunsigned: getunsigned
+}