add script to migrate products from old DB

This is a script to migrate from the old PostgreSQL to MongoDB.
The script joins the products with its specs to denormalize access.

scripts/products-sanitizer.js

@@ -0,0 +1,90 @@
+/* eslint-disable no-unused-vars */
+const fs = require("fs");
+
+let products = JSON.parse(
+  fs.readFileSync("products.json", { encoding: "utf8" })
+);
+let specs = JSON.parse(fs.readFileSync("specs.json", { encoding: "utf8" }));
+
+specs.sort((a, b) => {
+  const productA = `${a.brand} ${a.product}`;
+  const productB = `${b.brand} ${b.product}`;
+  return productA < productB ? -1 : productA > productB ? 1 : 0;
+});
+
+const binarySearch = (arr, searchedProduct, start, end) => {
+  if (start > end) return false;
+  const mid = Math.floor((start + end) / 2);
+  const product = `${arr[mid].brand} ${arr[mid].product}`;
+  if (product === searchedProduct) return arr[mid];
+  if (product > searchedProduct)
+    return binarySearch(arr, searchedProduct, start, mid - 1);
+  else return binarySearch(arr, searchedProduct, mid + 1, end);
+};
+
+products = products.map(product => {
+  const spec = binarySearch(
+    specs,
+    `${product.brand} ${product.product}`,
+    0,
+    specs.length - 1
+  );
+
+  const {
+    brand: _tmp1,
+    product: _tmp2,
+    thumbnail: _tmp3,
+    publish_date,
+    ...rest
+  } = spec;
+
+  const newSpec = {
+    publish_date: new Date(publish_date),
+    ...rest
+  };
+
+  const returnedProduct = {
+    ...product,
+    ratings_buckets: [
+      "جودة التصنيع",
+      "واجهة المستخدم",
+      "القيمة للسعر",
+      "الكاميرا",
+      "جودة المكالمات",
+      "البطارية"
+    ]
+  };
+
+  if (spec) returnedProduct.specs = newSpec;
+
+  return returnedProduct;
+});
+
+const MongoClient = require("mongodb").MongoClient;
+
+const user = encodeURIComponent(process.env.DB_USER);
+const password = encodeURIComponent(process.env.DB_PASSWORD);
+const dbName = "urrevs";
+const url = `mongodb://${user}:${password}@urrevs.com:27017/?authMechanism=SCRAM-SHA-1&authSource=${dbName}`;
+
+MongoClient.connect(
+  url,
+  {
+    useNewUrlParser: true,
+    useUnifiedTopology: true
+  },
+  function(err, client) {
+    if (err) return console.log(err);
+
+    const db = client.db(dbName);
+    const collection = db.collection("products");
+
+    collection.insertMany(products, function(err, result) {
+      if (err) console.log(err);
+      else
+        console.log(
+          `Inserted ${result.insertedCount} documents into the collection.`
+        );
+    });
+  }
+);