From 52cbc5ac4e0b2a4f81d70050ba2e83ad8541db0d Mon Sep 17 00:00:00 2001
From: Joe Carstairs <65492573+Sycamost@users.noreply.github.com>
Date: Thu, 7 Mar 2024 22:21:39 +0000
Subject: saves stuff in data.json

---
 .gitignore        |  1 +
 package-lock.json |  6 ++++++
 package.json      |  1 +
 src/app.js        |  3 ++-
 src/db.js         | 30 ++++++++++++++++++++++++++++++
 5 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/.gitignore b/.gitignore
index 3c3629e..9726dce 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 node_modules
+data.json
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index 564139f..8dd377b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,6 +8,7 @@
       "dependencies": {
         "body-parser": "^1.20.2",
         "express": "^4.18.3",
+        "fs": "^0.0.1-security",
         "twilio": "^4.23.0"
       },
       "devDependencies": {
@@ -543,6 +544,11 @@
         "node": ">= 0.6"
       }
     },
+    "node_modules/fs": {
+      "version": "0.0.1-security",
+      "resolved": "https://registry.npmjs.org/fs/-/fs-0.0.1-security.tgz",
+      "integrity": "sha512-3XY9e1pP0CVEUCdj5BmfIZxRBTSDycnbqhIOGec9QYtmVH2fbLpj86CFWkrNOkt/Fvty4KZG5lTglL9j/gJ87w=="
+    },
     "node_modules/function-bind": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.2.tgz",
diff --git a/package.json b/package.json
index dbbdaae..5df1265 100644
--- a/package.json
+++ b/package.json
@@ -5,6 +5,7 @@
   "dependencies": {
     "body-parser": "^1.20.2",
     "express": "^4.18.3",
+    "fs": "^0.0.1-security",
     "twilio": "^4.23.0"
   },
   "devDependencies": {
diff --git a/src/app.js b/src/app.js
index 9b47728..a374995 100644
--- a/src/app.js
+++ b/src/app.js
@@ -1,9 +1,10 @@
 const bodyParser = require('body-parser');
 const express = require('express');
-const { isSubscribed, getSubscriptions, getSubscriptionFromNumber, subscribe } = require('./db');
+const { isSubscribed, getSubscriptions, getSubscriptionFromNumber, subscribe, load: loadData } = require('./db');
 const { sendTextMessage } = require('./sendTextMessage');
 const { MessagingResponse } = require('twilio').twiml;
 
+loadData();
 const app = express();
 
 app.use(bodyParser.urlencoded({ extended: false }));
diff --git a/src/db.js b/src/db.js
index ba37a30..c277f7c 100644
--- a/src/db.js
+++ b/src/db.js
@@ -1,6 +1,8 @@
 // Ideally, we should write to a file and read it at app start in case of crashes.
 // An actual SQL database would probably be overkill.
 
+const { readFileSync, writeFile } = require("fs");
+
 /** @type Array<{ name: string, number: string }> */
 const subscriptions = [];
 
@@ -11,6 +13,7 @@ const subscriptions = [];
 function subscribe(number, name) {
   const subscription = { name, number };
   subscriptions.push(subscription);
+  void save();
   return subscription;
 }
 
@@ -37,9 +40,36 @@ function getSubscriptionFromNumber(number) {
   return subscriptions.find(sub => sub.number === number);
 }
 
+async function save() {
+  try {
+    await writeFile('../data.json', JSON.stringify({ subscriptions }));
+  } catch (err) {
+    if (typeof err === 'string') {
+      console.error(`Error writing data: ${err}`);
+    } else {
+      console.error(`Error writing data: ${JSON.stringify(err)}`);
+    }
+  }
+}
+
+function load() {
+  try {
+    const data = JSON.parse(readFileSync('../data.json'));
+    while (subscriptions.pop()) {}
+    subscriptions.push(...data['subscriptions']);
+  } catch (err){
+    if (typeof err === 'string') {
+      console.error(`Error reading data: ${err}`);
+    } else {
+      console.error(`Error reading data: ${JSON.stringify(err)}`);
+    }
+  }
+}
+
 module.exports = {
   subscribe,
   isSubscribed,
   getSubscriptions,
   getSubscriptionFromNumber,
+  load,
 };
\ No newline at end of file
-- 
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