урок 82

fsDemo.ts

+import * as fs from 'fs';
+
+const fileName = 'test.json';
+
+fs.readFile(fileName, (err: NodeJS.ErrnoException | null, data: Buffer) => {
+  if (err) console.error(err);
+  else console.log('File contents:', JSON.parse(data.toString()));
+});

package-lock.json

@@ -9,12 +9,16 @@
       "version": "1.0.0",
       "license": "ISC",
       "dependencies": {
+        "class-transformer": "^0.5.1",
+        "cors": "^2.8.5",
         "express": "^4.18.2",
+        "reflect-metadata": "^0.2.1",
         "ts-node": "^10.9.1",
         "tslib": "^2.6.0",
         "typescript": "^5.1.6"
       },
       "devDependencies": {
+        "@types/cors": "^2.8.17",
         "@types/express": "^4.17.17",
         "@types/node": "^20.4.2",
         "@typescript-eslint/eslint-plugin": "^6.0.0",
@@ -288,6 +292,15 @@
         "@types/node": "*"
       }
     },
+    "node_modules/@types/cors": {
+      "version": "2.8.17",
+      "resolved": "https://registry.npmjs.org/@types/cors/-/cors-2.8.17.tgz",
+      "integrity": "sha512-8CGDvrBj1zgo2qE+oS3pOCyYNqCPryMWY2bGfwA0dcfopWGgxs+78df0Rs3rc9THP4JkOhLsAa+15VdpAqkcUA==",
+      "dev": true,
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/express": {
       "version": "4.17.21",
       "resolved": "https://registry.npmjs.org/@types/express/-/express-4.17.21.tgz",
@@ -859,6 +872,11 @@
         "node": ">= 6"
       }
     },
+    "node_modules/class-transformer": {
+      "version": "0.5.1",
+      "resolved": "https://registry.npmjs.org/class-transformer/-/class-transformer-0.5.1.tgz",
+      "integrity": "sha512-SQa1Ws6hUbfC98vKGxZH3KFY0Y1lm5Zm0SY8XX9zbK7FJCyVEac3ATW0RIpwzW+oOfmHE5PMPufDG9hCfoEOMw=="
+    },
     "node_modules/color-convert": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
@@ -915,6 +933,18 @@
       "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz",
       "integrity": "sha512-QADzlaHc8icV8I7vbaJXJwod9HWYp8uCqf1xa4OfNu1T7JVxQIrUgOWtHdNDtPiywmFbiS12VjotIXLrKM3orQ=="
     },
+    "node_modules/cors": {
+      "version": "2.8.5",
+      "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.5.tgz",
+      "integrity": "sha512-KIHbLJqu73RGr/hnbrO9uBeixNGuvSQjul/jdFvS/KFSIH1hWVd1ng7zOHx+YrEfInLG7q4n6GHQ9cDtxv/P6g==",
+      "dependencies": {
+        "object-assign": "^4",
+        "vary": "^1"
+      },
+      "engines": {
+        "node": ">= 0.10"
+      }
+    },
     "node_modules/create-require": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/create-require/-/create-require-1.1.1.tgz",
@@ -2171,6 +2201,14 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/object-assign": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
+      "integrity": "sha512-rJgTQnkUnH1sFw8yT6VSU3zD3sWmu6sZhIseY8VX+GRu3P6F7Fu+JNDoXfklElbLJSnc3FUQHVe4cU5hj+BcUg==",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/object-inspect": {
       "version": "1.13.1",
       "resolved": "https://registry.npmjs.org/object-inspect/-/object-inspect-1.13.1.tgz",
@@ -2450,6 +2488,11 @@
         "node": ">=8.10.0"
       }
     },
+    "node_modules/reflect-metadata": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/reflect-metadata/-/reflect-metadata-0.2.1.tgz",
+      "integrity": "sha512-i5lLI6iw9AU3Uu4szRNPPEkomnkjRTaVt9hy/bn5g/oSzekBSMeLZblcjP74AW0vBabqERLLIrz+gR8QYR54Tw=="
+    },
     "node_modules/resolve-from": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-4.0.0.tgz",

package.json

@@ -13,12 +13,16 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
+    "class-transformer": "^0.5.1",
+    "cors": "^2.8.5",
     "express": "^4.18.2",
+    "reflect-metadata": "^0.2.1",
     "ts-node": "^10.9.1",
     "tslib": "^2.6.0",
     "typescript": "^5.1.6"
   },
   "devDependencies": {
+    "@types/cors": "^2.8.17",
     "@types/express": "^4.17.17",
     "@types/node": "^20.4.2",
     "@typescript-eslint/eslint-plugin": "^6.0.0",
@@ -27,7 +31,7 @@
     "eslint-config-prettier": "^8.8.0",
     "eslint-plugin-prettier": "^5.0.0",
     "nodemon": "^3.0.1",
-    "tsconfig-paths": "^4.2.0",
-    "prettier": "^3.0.0"
+    "prettier": "^3.0.0",
+    "tsconfig-paths": "^4.2.0"
   }
 }

src/app.ts

- import express from 'express';
+import express from 'express';
 import { Application, RequestHandler } from 'express';
 import { AppInit } from './interfaces/AppInit.interface';
 import { IRoute } from './interfaces/IRoute.interface';

src/controllers/product.controller.ts

+import { RequestHandler } from 'express';
+import { ProductService } from '@/services/product.service';
+import { plainToInstance } from 'class-transformer';
+import { ProductDto } from '@/dto/ProductDto';
+
+export class ProductController {
+  private service: ProductService;
+
+  constructor() {
+    this.service = new ProductService();
+  }
+
+  getProducts: RequestHandler = (req, res): void => {
+    const products = this.service.getProducts();
+    res.send(products);
+  };
+  getProduct: RequestHandler = (req, res): void => {
+    const product = this.service.getProduct(req.params.id);
+    res.send(product);
+  };
+  createProduct: RequestHandler = (req, res): void => {
+    const productDto = plainToInstance(ProductDto, req.body);
+    const product = this.service.createProduct(productDto);
+    res.send(product);
+  };
+}

src/data/products.json

+[
+  {
+    "id": "d21c0ed1-ba56-4d2b-8a5f-999fd4615dd9",
+    "title": "test title",
+    "price": 10,
+    "description": "test description"
+  },
+  {
+    "id": "6e2cbadd-0193-46be-9cd6-cea2ca3c1c73",
+    "title": "Example",
+    "price": 100500
+  },
+  {
+    "id": "f6e4a14f-20c5-4b97-8ac8-fa4a36b8d92d",
+    "name": "New product",
+    "description": "Some new cool perfect super product",
+    "price": 1600
+  }
+]
\ No newline at end of file

src/dto/ProductDto.ts

+import { Expose } from 'class-transformer';
+@Expose()
+export class ProductDto {
+  title!: string;
+  description!: string;
+  price!: number;
+}

src/index.ts

 import App from './app';
 import logger from './middlewares/logger';
 import { ArticleRoute } from './routes/article.route';
+import { ProductRoute } from '@/routes/product.route';
+import cors from 'cors';
 
 const app = new App({
   port: 8000,
-  middlewares: [logger()],
-  controllers: [new ArticleRoute()],
+  middlewares: [logger(), cors()],
+  controllers: [new ArticleRoute(), new ProductRoute()],
 });
 
 app.listen();

src/interfaces/IProduct.interface.ts

+export interface IProduct {
+  id: string;
+  title: string;
+  price: number;
+  description?: string;
+}

src/routes/article.route.ts

@@ -6,7 +6,6 @@ export class ArticleRoute implements IRoute {
   public path = '/articles';
   public router = Router();
   private controller: ArticleController;
-
   constructor() {
     this.controller = new ArticleController();
     this.init();

src/routes/product.route.ts

+import { Router } from 'express';
+import { IRoute } from '@/interfaces/IRoute.interface';
+import { ProductController } from '@/controllers/product.controller';
+
+export class ProductRoute implements IRoute {
+  public path = '/products';
+  public router = Router();
+  private controller: ProductController;
+
+  constructor() {
+    this.controller = new ProductController();
+    this.init();
+  }
+
+  private init() {
+    this.router.get('/', this.controller.getProducts);
+    this.router.get('/:id', this.controller.getProduct);
+    this.router.post('/', this.controller.createProduct);
+  }
+}

src/services/product.service.ts

+import { IProduct } from '@/interfaces/IProduct.interface';
+import { ProductDto } from '@/dto/ProductDto';
+import * as fs from 'fs';
+import path from 'path';
+import { randomUUID } from 'crypto';
+
+const filePath = path.join(__dirname, '../data/products.json');
+
+export class ProductService {
+  private products: IProduct[] = [];
+
+  constructor() {
+    this.init();
+  }
+
+  private init() {
+    try {
+      const fileContents = fs.readFileSync(filePath);
+      this.products = JSON.parse(fileContents.toString());
+    } catch (e) {
+      this.products = [];
+    }
+  }
+
+  private save() {
+    fs.writeFileSync(filePath, JSON.stringify(this.products, null, 2));
+  }
+
+  public getProducts(): IProduct[] {
+    return this.products;
+  }
+
+  public getProduct(id: string): IProduct {
+    const singleProduct = this.products.find((product) => product.id === id);
+    if (singleProduct) return singleProduct;
+    else throw new Error('Invalid id');
+  }
+
+  public createProduct(productDto: ProductDto): IProduct {
+    const product = {
+      id: randomUUID(),
+      ...productDto,
+    };
+
+    this.products.push(product);
+    this.save();
+    return product;
+  }
+}

tsconfig.json

@@ -23,7 +23,7 @@
     "experimentalDecorators": true,
     "emitDecoratorMetadata": true,
     "resolveJsonModule": true,
-    "esModuleInterop": true
+    "esModuleInterop": true,
   },
   "include": ["src/**/*.ts"],
   "exclude": ["node_modules"]