Added hashing of passwords

Closes #95 (closed)

backend/api/players.js

 const express = require("express");
 const router = express.Router();
 const mongo = require("mongodb");
+const bcrypt = require("bcrypt");
 const MongoClient = mongo.MongoClient;
 const connectionUrl = process.env.MONGO_CONNECTION_STRING;
+const saltRounds = 10;
 
 router.get("/username/:playerId", (req, res) => {
   // Connect to database
@@ -67,14 +69,30 @@ router.get("/login/:username/:password", (req, res) => {
       db.collection(collection)
         .find({
           name: req.params.username,
-          password: req.params.password,
         })
         .toArray((err, result) => {
           if (err) {
             res.sendStatus(500);
             return;
           }
-          res.json(result);
+          // Compares the given password with the encrypted password stored in the database,
+          // response is true on match, false else
+          bcrypt.compare(
+            req.params.password,
+            result[0].password,
+            (err, response) => {
+              if (err) {
+                res.sendStatus(500);
+                client.close();
+                return;
+              }
+              if (response) {
+                res.json(result);
+              } else {
+                res.json([]);
+              }
+            }
+          );
           client.close();
         });
     }
@@ -103,24 +121,30 @@ router.put("/", (req, res) => {
         res.status(400).send("Invalid parameters");
         return;
       }
-
-      // Inserts the user. Note that the name index is unique, inserting a user with an
-      // already existing username will give an error.
-      db.collection(collection).insertOne(
-        {
-          name: req.body.username,
-          password: req.body.password,
-          dateJoined: date,
-        },
-        (err, result) => {
-          if (err) {
-            res.status(400).send("Already existing username"); // Internal server error
-            return;
-          }
-          res.json(result.ops[0]);
-          client.close();
+      //Hashes the password
+      bcrypt.hash(req.body.password, saltRounds, (err, hash) => {
+        if (err) {
+          res.sendStatus(500); // Internal server error
+          return;
         }
-      );
+        // Inserts the user. Note that the name index is unique, inserting a user with an
+        // already existing username will give an error.
+        db.collection(collection).insertOne(
+          {
+            name: req.body.username,
+            password: hash,
+            dateJoined: date,
+          },
+          (err, result) => {
+            if (err) {
+              res.status(400).send("Already existing username");
+              return;
+            }
+            res.json(result.ops[0]);
+            client.close();
+          }
+        );
+      });
     }
   );
 });