added ability to set pin for settings. pin is md5'd by the backend

backend/app.js

@@ -9,6 +9,7 @@ var express = require("express");
 var bodyParser = require("body-parser");
 var archiver = require('archiver');
 const low = require('lowdb')
+var md5 = require('md5');
 var URL = require('url').URL;
 const shortid = require('shortid')
 const url_api = require('url');
@@ -29,7 +30,8 @@ db.defaults(
             video: []
         },
         configWriteFlag: false,
-        subscriptions: []
+        subscriptions: [],
+        pin_md5: ''
 }).write();
 
 // config values
@@ -1176,6 +1178,47 @@ app.post('/api/downloadArchive', async (req, res) => {
 
 });
 
+app.post('/api/isPinSet', async (req, res) => {
+    let stored_pin = db.get('pin_md5').value();
+    let is_set = false;
+    if (!stored_pin || stored_pin.length === 0) {
+    } else {
+        is_set = true;
+    }
+
+    res.send({
+        is_set: is_set
+    });
+});
+
+app.post('/api/setPin', async (req, res) => {
+    let unhashed_pin = req.body.pin;
+    let hashed_pin = md5(unhashed_pin);
+
+    db.set('pin_md5', hashed_pin).write();
+
+    res.send({
+        success: true
+    });
+});
+
+app.post('/api/checkPin', async (req, res) => {
+    let input_pin = req.body.input_pin;
+    let input_pin_md5 = md5(input_pin);
+
+    let stored_pin = db.get('pin_md5').value();
+
+    let successful = false;
+    
+    if (input_pin_md5 === stored_pin) {
+        successful = true;
+    }
+
+    res.send({
+        success: successful
+    });
+});
+
 app.get('/api/video/:id', function(req , res){
     var head;
     let optionalParams = url_api.parse(req.url,true).query;