diff --git a/.env b/.env new file mode 100644 index 0000000..c0c68b1 --- /dev/null +++ b/.env @@ -0,0 +1 @@ +PORT=3000 \ No newline at end of file diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..d4e0572 --- /dev/null +++ b/.gitignore @@ -0,0 +1,3 @@ +node_modules +.idea +dist \ No newline at end of file diff --git a/README.md b/README.md index acc3897..a4fc170 100644 --- a/README.md +++ b/README.md @@ -1 +1,51 @@ -# CRUD-API-nodejs \ No newline at end of file +# CRUD-API-nodejs + +## Installation Guide + +1. Install dependencies: + ``` + npm i + ``` +2. Run start:dev script for running application in development mode + ``` + npm run start:dev + ``` + Or run start:prod script for running application in production mode + + ``` + npm run start:dev + ``` + +3. Then use postman to test app. + +### Implemented endpoint api/users: + +- **GET** `api/users` is used to get all persons + - Server should answer with `status code` **200** and all users records + - **GET** `api/users/{userId}` + - Server should answer with `status code` **200** and record with `id === userId` if it exists + - Server should answer with `status code` **400** and corresponding message if `userId` is invalid (not `uuid`) + - Server should answer with `status code` **404** and corresponding message if record with `id === userId` doesn't exist + - **POST** `api/users` is used to create record about new user and store it in database + - Server should answer with `status code` **201** and newly created record + - Server should answer with `status code` **400** and corresponding message if request `body` does not contain **required** fields + - **PUT** `api/users/{userId}` is used to update existing user + - Server should answer with` status code` **200** and updated record + - Server should answer with` status code` **400** and corresponding message if `userId` is invalid (not `uuid`) + - Server should answer with` status code` **404** and corresponding message if record with `id === userId` doesn't exist + - **DELETE** `api/users/{userId}` is used to delete existing user from database + - Server should answer with `status code` **204** if the record is found and deleted + - Server should answer with `status code` **400** and corresponding message if `userId` is invalid (not `uuid`) + - Server should answer with `status code` **404** and corresponding message if record with `id === userId` doesn't exist + +### There is one predefined User in database for better testing +```JSON +{ + "id": "876c2611-aa48-4ab4-9199-e8fc83e492b8", + "username": "Artur", + "age": 23, + "hobbies": [ + "footbal" + ] +} +``` \ No newline at end of file diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..c58a08d --- /dev/null +++ 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"^9.0.1" + } +} diff --git a/src/constants.ts b/src/constants.ts new file mode 100644 index 0000000..ee65b16 --- /dev/null +++ b/src/constants.ts @@ -0,0 +1,25 @@ +export const STATUS_CODES = { + Success: 200, + Created: 201, + Bad_Request: 400, + No_Content: 204, + Not_Found: 404, + Server_Error: 500 +} + +export const METHOD = { + GET: 'GET', + POST: 'POST', + PUT: 'PUT', + DELETE: 'DELETE' +} + +export const ERRORS_MESSAGES = { + Not_Found: 'Requested resource is not found on server', + Server_Error: 'Server error occurred', + Bad_Request: 'Bad request of body input' +} + +export const API_URL = '/api/users'; + +export const ID_REGEXP = `${API_URL}/([[a-zA-Z\\d-]+)\\/*`; \ No newline at end of file diff --git a/src/errors-hadlers.ts b/src/errors-hadlers.ts new file mode 100644 index 0000000..96f6996 --- /dev/null +++ b/src/errors-hadlers.ts @@ -0,0 +1,20 @@ +import http from "http"; +import {ERRORS_MESSAGES, STATUS_CODES} from "./constants"; + +export function sendNotFoundResponse(res: http.ServerResponse) { + res.statusCode = STATUS_CODES.Not_Found; + res.statusMessage = ERRORS_MESSAGES.Not_Found; + res.end(); +} + +export function sendServerErrorResponse(res: http.ServerResponse) { + res.statusCode = STATUS_CODES.Server_Error; + res.statusMessage = ERRORS_MESSAGES.Server_Error; + res.end(); +} + +export function sendBadRequestError (res: http.ServerResponse) { + res.statusCode = STATUS_CODES.Bad_Request; + res.statusMessage = ERRORS_MESSAGES.Bad_Request; + res.end(); +} diff --git a/src/request-handler.ts b/src/request-handler.ts new file mode 100644 index 0000000..b6f3f08 --- /dev/null +++ b/src/request-handler.ts @@ -0,0 +1,182 @@ +import http from "http"; +import {v4 as uuidv4} from 'uuid'; + +import {API_URL, ERRORS_MESSAGES, ID_REGEXP, METHOD, STATUS_CODES} from "./constants"; +import {addUser, getAllUsers, getUserById, removeUserById, updateUser, User, UserInput} from "./users-service"; +import {sendNotFoundResponse, sendBadRequestError, sendServerErrorResponse} from "./errors-hadlers"; + +export function requestHandler(req: http.IncomingMessage, res: http.ServerResponse) { + const {method, url} = req; + let body = ''; + console.log(method, url); + res.setHeader('Content-Type', 'application/json') + + if (!url || !url.includes(API_URL)) { + sendNotFoundResponse(res); + return; + } + + req.on('data', (chunk) => { + body += chunk; + }); + req.on('end', () => { + try { + switch (method) { + case METHOD.GET: + handleGetRequest(url!, res); + break; + case METHOD.POST: + handlePostRequest(url!, body, res); + break; + case METHOD.PUT: + handlePutRequest(url, body, res); + break; + case METHOD.DELETE: + handleDeleteRequest(url, res); + break; + default: + sendNotFoundResponse(res); + } + } catch (e) { + sendServerErrorResponse(res); + } + }); + req.on('error', () => { + sendServerErrorResponse(res); + }) +} + +function handleGetRequest(url: string, res: http.ServerResponse) { + if (url === API_URL) { + const users = getAllUsers(); + res.write(JSON.stringify(users)); + res.statusCode = STATUS_CODES.Success; + res.end(); + return; + } + + if (url.startsWith(`${API_URL}/`)) { + const idMatch = url.match(ID_REGEXP); + if (!idMatch || !idMatch[1]) { + sendBadRequestError(res); + return; + } + + const id = idMatch[1]; + + const user = getUserById(id); + if (!user) { + sendNotFoundResponse(res); + return; + } + + res.write(JSON.stringify(user)); + res.statusCode = STATUS_CODES.Success; + res.end(); + return; + } + + sendNotFoundResponse(res); +} + +function handlePostRequest(url: string, bodyChunk: any, res: http.ServerResponse) { + const body = JSON.parse(bodyChunk); + console.log('body', body); + if (url !== API_URL) { + sendNotFoundResponse(res); + return; + } + + if (!validatePostUser(body)) { + sendBadRequestError(res); + return; + } + + const user: User = { + id: uuidv4(), + username: body.username, + age: body.age, + hobbies: body.hobbies + } + + addUser(user); + res.write(JSON.stringify(user)); + res.statusCode = STATUS_CODES.Created; + res.end(); +} + +function handlePutRequest(url: string, bodyChunk: any, res: http.ServerResponse) { + const body = JSON.parse(bodyChunk); + console.log('body', body); + if (url.startsWith(`${API_URL}/`)) { + const idMatch = url.match(ID_REGEXP); + if (!idMatch || !idMatch[1]) { + sendBadRequestError(res); + return; + } + + const id = idMatch[1]; + const newUser = getUpdatedUser(body); + if (!newUser) { + sendBadRequestError(res); + return; + } + + const updatedUser = updateUser({...newUser, id: id}); + if (!updatedUser) { + sendNotFoundResponse(res); + return; + } + + res.write(JSON.stringify(updatedUser)); + res.statusCode = STATUS_CODES.Created; + res.end(); + return; + } + + sendNotFoundResponse(res); +} + +function handleDeleteRequest(url: string, res: http.ServerResponse) { + if (url.startsWith(`${API_URL}/`)) { + const idMatch = url.match(ID_REGEXP); + if (!idMatch || !idMatch[1]) { + sendBadRequestError(res); + return; + } + + const id = idMatch[1]; + + const isRemoved = removeUserById(id); + if (!isRemoved) { + sendNotFoundResponse(res); + return; + } + + res.statusCode = STATUS_CODES.No_Content; + res.end(); + return; + } + sendNotFoundResponse(res); +} + +function validatePostUser(body: any): body is UserInput { + if (!body.username || typeof body.username !== 'string') return false; + if (!body.age || typeof body.age !== 'number') return false; + if (!body.hobbies || !isArrayOfStrings(body.hobbies)) return false; + return true; +} + +function getUpdatedUser(body) { + const newUser = {}; + if ('username' in body && typeof body.username === 'string') Object.assign(newUser, {username: body.username}); + if ('age' in body && typeof body.age === 'number') Object.assign(newUser, {age: body.age}); + if ('hobbies' in body && isArrayOfStrings(body.hobbies)) Object.assign(newUser, {hobbies: body.hobbies}); + + if (Object.keys(newUser).length === 0) return null; + return newUser; +} + +function isArrayOfStrings(array: any): boolean { + return Array.isArray(array) && array.every((hobby) => typeof hobby === 'string'); +} \ No newline at end of file diff --git a/src/server.ts b/src/server.ts new file mode 100644 index 0000000..68bc10b --- /dev/null +++ b/src/server.ts @@ -0,0 +1,8 @@ +import http from 'http'; +import {requestHandler} from "./request-handler"; +import 'dotenv/config' + +const port = process.env.PORT || 3000; +const server = http.createServer(requestHandler); +server.listen(+port); +console.log(`Server listening on port ${port}`); \ No newline at end of file diff --git a/src/users-service.ts b/src/users-service.ts new file mode 100644 index 0000000..46aea4b --- /dev/null +++ b/src/users-service.ts @@ -0,0 +1,38 @@ +export interface User { + id: string, + username: string, + age: number, + hobbies: string[] +} + +export type UserInput = Omit + +const userDb: User[] = [{"id":"876c2611-aa48-4ab4-9199-e8fc83e492b8","username":"Artur","age":23,"hobbies":["footbal"]}]; + +export function getAllUsers() { + return userDb; +} + +export function getUserById(id: string): User | undefined { + return userDb.find((user) => user.id === id); +} + +export function addUser(user: User) { + userDb.push(user); +} + +export function updateUser(user: Partial & { id: string }) { + const oldUser = getUserById(user.id) + if (!oldUser) return null; + + const newUser = Object.assign(oldUser, user); + return newUser; +} + +export function removeUserById(id: string) { + const userIndex = userDb.findIndex((user) => user.id === id); + if (userIndex === -1) return false; + + userDb.splice(userIndex); + return true; +} diff --git a/tsconfig.json b/tsconfig.json new file mode 100644 index 0000000..f37a305 --- /dev/null +++ b/tsconfig.json @@ -0,0 +1,18 @@ +{ + "compilerOptions": { + "target": "ES2015", + "outDir": "dist", + "module": "commonjs", + "moduleResolution": "node", + "esModuleInterop": true, + "noImplicitAny": false, + "strict": true, + "skipLibCheck": true, + "forceConsistentCasingInFileNames": true, + "allowSyntheticDefaultImports": true, /* Redirect output structure to the directory. */ + "rootDir": "src" + }, + "display": "Recommended", + "include": ["src/**/*"], + "exclude": ["node_modules",] +} \ No newline at end of file