Adds SQLite database for QR codes

Also renames database.sqlite to session_db.sqlite (for session storage)

qr-code/node/.gitignore

@@ -25,3 +25,6 @@ dist/
 # Without this, they may get a warning if using a different package manager to us
 yarn.lock
 package-lock.json
+
+# default database files
+*.sqlite

qr-code/node/package.json

@@ -12,9 +12,13 @@
     "deploy": "shopify app deploy"
   },
   "dependencies": {
-    "@shopify/cli": "2.0.2",
     "@shopify/app": "2.0.2",
-    "react": "17.0.2"
+    "@shopify/cli": "2.0.2",
+    "react": "17.0.2",
+    "sqlite3": "^5.0.8"
   },
-  "author": "paulo"
-}
+  "author": "Shopify",
+  "devDependencies": {
+    "@types/sqlite3": "^3.1.8"
+  }
+}

qr-code/node/web/backend/index.js

@@ -1,12 +1,13 @@
 // @ts-check
-import { join } from "path";
+import path from 'path';
 import express from "express";
 import cookieParser from "cookie-parser";
 import { Shopify, ApiVersion } from "@shopify/shopify-api";
 
 import applyAuthMiddleware from "./middleware/auth.js";
 import verifyRequest from "./middleware/verify-request.js";
 import { setupGDPRWebHooks } from "./gdpr.js";
+import { QRCodesDB } from './qr-codes-db.js';
 
 const USE_ONLINE_TOKENS = true;
 const TOP_LEVEL_OAUTH_COOKIE = "shopify_top_level_oauth";
@@ -18,6 +19,9 @@ const isTest = process.env.NODE_ENV === "test" || !!process.env.VITE_TEST_BUILD;
 const DEV_INDEX_PATH = `${process.cwd()}/frontend/`;
 const PROD_INDEX_PATH = `${process.cwd()}/dist/`;
 
+const sessionDbFile = path.join(process.cwd(), 'session_db.sqlite');
+const qrCodesDbFile = path.join(process.cwd(), 'qr_codes_db.sqlite');
+
 Shopify.Context.initialize({
   API_KEY: process.env.SHOPIFY_API_KEY,
   API_SECRET_KEY: process.env.SHOPIFY_API_SECRET,
@@ -27,9 +31,11 @@ Shopify.Context.initialize({
   API_VERSION: ApiVersion.April22,
   IS_EMBEDDED_APP: true,
   // This should be replaced with your preferred storage strategy
-  SESSION_STORAGE: new Shopify.Session.MemorySessionStorage(),
+  SESSION_STORAGE: new Shopify.Session.SQLiteSessionStorage(sessionDbFile),
 });
 
+const qrCodesDB = new QRCodesDB(qrCodesDbFile);
+
 // Storing the currently active shops in memory will force them to re-login when your server restarts. You should
 // persist this object in your app.
 const ACTIVE_SHOPIFY_SHOPS = {};
@@ -128,7 +134,7 @@ export async function createServer(
     } else {
       // res.set('X-Shopify-App-Nothing-To-See-Here', '1');
       const fs = await import("fs");
-      const fallbackFile = join(
+      const fallbackFile = path.join(
         isProd ? PROD_INDEX_PATH : DEV_INDEX_PATH,
         "index.html"
       );

qr-code/node/web/backend/qr-codes-db.js

@@ -0,0 +1,52 @@
+import sqlite3 from 'sqlite3';
+
+export class QRCodesDB {
+  qrTableName = "qr_codes";
+  db = null;
+  ready = null;
+
+  constructor(filename) {
+    this.db = new sqlite3.Database(filename);
+    this.ready = this.init();
+  }
+
+  async hasQrCodesTable() {
+    const query = `
+    SELECT name FROM sqlite_schema
+    WHERE
+      type = 'table' AND
+      name = ?;
+    `;
+    const rows = await this.query(query, [this.qrTableName]);
+    return rows.length === 1;
+  }
+
+  async init() {
+    const hasQrCodesTable = await this.hasQrCodesTable();
+    if (!hasQrCodesTable) {
+      const query = `
+        CREATE TABLE ${this.qrTableName} (
+          id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
+          productId VARCHAR(255) NOT NULL,
+          goToCheckout TINYINT NOT NULL,
+          discountCode VARCHAR(255) NOT NULL,
+          hits INTEGER,
+          conversions INTEGER
+        )
+      `;
+      await this.query(query);
+    }
+  }
+
+  query(sql, params = []) {
+    return new Promise((resolve, reject) => {
+      this.db.all(sql, params, (err, result) => {
+        if (err) {
+          reject(err);
+          return;
+        }
+        resolve(result);
+      });
+    });
+  }
+}