From 28174c6a95d5671ac63613ff81954e49a24658e7 Mon Sep 17 00:00:00 2001 From: Sandeep Kumar Patel Date: Mon, 2 Oct 2023 19:58:53 +0530 Subject: [PATCH 1/2] messaging, authentication, rooms, socket io --- .gitignore | 2 + backend/index.ts | 78 ++ backend/utils/rooms.ts | 49 ++ backend/utils/users.ts | 58 ++ package-lock.json | 1553 ++++++++++++++++++++++++++++++++++++++++ package.json | 24 + tsconfig.json | 109 +++ 7 files changed, 1873 insertions(+) create mode 100644 .gitignore create mode 100644 backend/index.ts create mode 100644 backend/utils/rooms.ts create mode 100644 backend/utils/users.ts create mode 100644 package-lock.json create mode 100644 package.json create mode 100644 tsconfig.json diff --git a/.gitignore b/.gitignore new file mode 100644 index 000000000..1dcef2d9f --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +node_modules +.env \ No newline at end of file diff --git a/backend/index.ts b/backend/index.ts new file mode 100644 index 000000000..6e97a4a03 --- /dev/null +++ b/backend/index.ts @@ -0,0 +1,78 @@ +const { getUsers } = require("./utils/users"); +const { userJoin } = require("./utils/users"); +const { getRooms } = require("./utils/rooms"); +const { roomJoin } = require("./utils/rooms"); +const { leaveRoom } = require("./utils/rooms"); + +const express = require("express"); +const http = require("http"); +const { Server } = require("socket.io"); +const cors = require("cors"); + +const app = express(); + +app.use(cors()); + +const server = http.createServer(app); + +const io = new Server(server, { + cors: { + origin: true, + // origin: "http://locahost:3000", + methods: ["GET", "POST"], + }, +}); + +interface messageProps { + username: string; + message: string; + room: string; +} + +io.on("connection", (socket: any) => { + console.log(`User Connected: ${socket.id}`); + + socket.on("join_room", (data: string) => { + if (!roomJoin(data, socket.id)) { + socket.emit("username", `User already joined the room`); + } else { + socket.join(data); + socket.emit("username", `User joined the room`); + console.log(getRooms()); + } + + console.log(data, "room"); + }); + + socket.on("add_user", (username: string) => { + if (!userJoin(socket.id, username)) { + socket.emit("username", `Username ${username} already exists`); + } else { + socket.emit("username", `Username ${username} submitted successfully`); + console.log(getUsers()); + } + }); + + socket.on("send_message", (data: messageProps) => { + // socket.broadcast.emit("receive_message", data); + socket.broadcast.to(data.room).emit("receive_message", data.message); + console.log(typeof data.room, data.message); + }); + + socket.on("leave_room", (data: string) => { + console.log("dis", data); + + if (leaveRoom(socket.id, data)) { + socket.broadcast + .to(data) + .emit("receive_message", "A user has left the chat"); + socket.leave(data); + } else { + console.log( + "You cannot leave because you did not joined the room before" + ); + } + }); +}); + +server.listen(5000, () => console.log("Server started on PORT 5000")); diff --git a/backend/utils/rooms.ts b/backend/utils/rooms.ts new file mode 100644 index 000000000..7acf2584b --- /dev/null +++ b/backend/utils/rooms.ts @@ -0,0 +1,49 @@ +let rooms: { room: string; usersID: string[] }[] = []; + +export const roomJoin = (roomID: string, userID: string): boolean => { + let room = rooms.find((room) => roomID === room.room); + // console.log(room, "=="); + + if (room === undefined) { + const newRoom = { + room: roomID, + usersID: [userID], + }; + rooms.push(newRoom); + + return true; + } + + let user = room?.usersID.find((user) => user === userID); + + if (user) { + return false; + } + + room?.usersID.push(userID); + + return true; +}; + +export const leaveRoom = (userId: string, roomID: string) => { + let room = rooms.find((room) => roomID === room.room); + + const idx = room?.usersID.indexOf(userId); + + if (idx !== -1 && idx !== undefined) { + room?.usersID.splice(idx, 1); + console.log(rooms); + + return true; + } + + return false; + + // const userIndex = room.usersID.indexOf(userId); + + // if (userIndex !== -1) { + // // Remove the user from the usersID array + // room.usersID.splice(userIndex, 1); +}; + +export const getRooms = () => rooms; diff --git a/backend/utils/users.ts b/backend/utils/users.ts new file mode 100644 index 000000000..abbe84685 --- /dev/null +++ b/backend/utils/users.ts @@ -0,0 +1,58 @@ +let users: { id: string; username: string }[] = []; + +export const userJoin = (id: string, username: string): boolean => { + let user = users.find((user) => user.username === username); + + if (user) { + return false; + } + + users.push({ id, username }); + + return true; +}; + +export const userLeft = (id: string) => { + users = users.filter((user) => user.id !== id); +}; + +export const getUsers = () => users; + +// const users = []; + +// let users: { id: string; username: string }[] = []; + +// // Join user to chat +// function userJoin(id: string, username: string, room: string) { +// const user = { id, username, room }; + +// users.push(user); + +// return user; +// } + +// // Get current user +// function getCurrentUser(id) { +// return users.find((user) => user.id === id); +// } + +// // User leaves chat +// function userLeave(id) { +// const index = users.findIndex((user) => user.id === id); + +// if (index !== -1) { +// return users.splice(index, 1)[0]; +// } +// } + +// // Get room users +// function getRoomUsers(room) { +// return users.filter((user) => user.room === room); +// } + +// module.exports = { +// userJoin, +// getCurrentUser, +// userLeave, +// getRoomUsers, +// }; diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 000000000..871b60deb --- /dev/null +++ b/package-lock.json @@ -0,0 +1,1553 @@ +{ + "name": "sandeep", + "version": "1.0.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "sandeep", + "version": "1.0.0", + "license": "ISC", + "dependencies": { + "cors": "^2.8.5", + 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This chat application will enable users to communicate with each other by sending text messages and sharing images in real-time within a chat room.", + "main": "index.ts", + "scripts": { + "start": "nodemon backend/index.ts" + }, + "author": "", + "license": "ISC", + "dependencies": { + "cors": "^2.8.5", + "dotenv": "^16.3.1", + "express": "^4.18.2", + "jsonwebtoken": "^9.0.2", + "socket.io": "^4.7.2", + "ts-node": "^10.9.1" + }, + "devDependencies": { + "@types/express": "^4.17.18", + "@types/node": "^20.8.0", + "nodemon": "^3.0.1" + } +} diff --git a/tsconfig.json b/tsconfig.json new file mode 100644 index 000000000..d70946120 --- /dev/null +++ b/tsconfig.json @@ -0,0 +1,109 @@ +{ + "compilerOptions": { + /* Visit https://aka.ms/tsconfig to read more about this file */ + + /* Projects */ + // "incremental": true, /* Save .tsbuildinfo files to allow for incremental compilation of projects. */ + // "composite": true, /* Enable constraints that allow a TypeScript project to be used with project references. */ + // "tsBuildInfoFile": "./.tsbuildinfo", /* Specify the path to .tsbuildinfo incremental compilation file. */ + // "disableSourceOfProjectReferenceRedirect": true, /* Disable preferring source files instead of declaration files when referencing composite projects. */ + // "disableSolutionSearching": true, /* Opt a project out of multi-project reference checking when editing. */ + // "disableReferencedProjectLoad": true, /* Reduce the number of projects loaded automatically by TypeScript. */ + + /* Language and Environment */ + "target": "es2016", /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */ + // "lib": [], /* Specify a set of bundled library declaration files that describe the target runtime environment. */ + // "jsx": "preserve", /* Specify what JSX code is generated. */ + // "experimentalDecorators": true, /* Enable experimental support for legacy experimental decorators. */ + // "emitDecoratorMetadata": true, /* Emit design-type metadata for decorated declarations in source files. */ + // "jsxFactory": "", /* Specify the JSX factory function used when targeting React JSX emit, e.g. 'React.createElement' or 'h'. */ + // "jsxFragmentFactory": "", /* Specify the JSX Fragment reference used for fragments when targeting React JSX emit e.g. 'React.Fragment' or 'Fragment'. */ + // "jsxImportSource": "", /* Specify module specifier used to import the JSX factory functions when using 'jsx: react-jsx*'. */ + // "reactNamespace": "", /* Specify the object invoked for 'createElement'. This only applies when targeting 'react' JSX emit. */ + // "noLib": true, /* Disable including any library files, including the default lib.d.ts. */ + // "useDefineForClassFields": true, /* Emit ECMAScript-standard-compliant class fields. */ + // "moduleDetection": "auto", /* Control what method is used to detect module-format JS files. */ + + /* Modules */ + "module": "commonjs", /* Specify what module code is generated. */ + "rootDir": "./backend", /* Specify the root folder within your source files. */ + // "moduleResolution": "node10", /* Specify how TypeScript looks up a file from a given module specifier. */ + // "baseUrl": "./", /* Specify the base directory to resolve non-relative module names. */ + // "paths": {}, /* Specify a set of entries that re-map imports to additional lookup locations. */ + // "rootDirs": [], /* Allow multiple folders to be treated as one when resolving modules. */ + // "typeRoots": [], /* Specify multiple folders that act like './node_modules/@types'. */ + // "types": [], /* Specify type package names to be included without being referenced in a source file. */ + // "allowUmdGlobalAccess": true, /* Allow accessing UMD globals from modules. */ + // "moduleSuffixes": [], /* List of file name suffixes to search when resolving a module. */ + // "allowImportingTsExtensions": true, /* Allow imports to include TypeScript file extensions. Requires '--moduleResolution bundler' and either '--noEmit' or '--emitDeclarationOnly' to be set. */ + // "resolvePackageJsonExports": true, /* Use the package.json 'exports' field when resolving package imports. */ + // "resolvePackageJsonImports": true, /* Use the package.json 'imports' field when resolving imports. */ + // "customConditions": [], /* Conditions to set in addition to the resolver-specific defaults when resolving imports. */ + // "resolveJsonModule": true, /* Enable importing .json files. */ + // "allowArbitraryExtensions": true, /* Enable importing files with any extension, provided a declaration file is present. */ + // "noResolve": true, /* Disallow 'import's, 'require's or ''s from expanding the number of files TypeScript should add to a project. */ + + /* JavaScript Support */ + // "allowJs": true, /* Allow JavaScript files to be a part of your program. Use the 'checkJS' option to get errors from these files. */ + // "checkJs": true, /* Enable error reporting in type-checked JavaScript files. */ + // "maxNodeModuleJsDepth": 1, /* Specify the maximum folder depth used for checking JavaScript files from 'node_modules'. Only applicable with 'allowJs'. */ + + /* Emit */ + // "declaration": true, /* Generate .d.ts files from TypeScript and JavaScript files in your project. */ + // "declarationMap": true, /* Create sourcemaps for d.ts files. */ + // "emitDeclarationOnly": true, /* Only output d.ts files and not JavaScript files. */ + // "sourceMap": true, /* Create source map files for emitted JavaScript files. */ + // "inlineSourceMap": true, /* Include sourcemap files inside the emitted JavaScript. */ + // "outFile": "./", /* Specify a file that bundles all outputs into one JavaScript file. If 'declaration' is true, also designates a file that bundles all .d.ts output. */ + "outDir": "./dist", /* Specify an output folder for all emitted files. */ + // "removeComments": true, /* Disable emitting comments. */ + // "noEmit": true, /* Disable emitting files from a compilation. */ + // "importHelpers": true, /* Allow importing helper functions from tslib once per project, instead of including them per-file. */ + // "importsNotUsedAsValues": "remove", /* Specify emit/checking behavior for imports that are only used for types. */ + // "downlevelIteration": true, /* Emit more compliant, but verbose and less performant JavaScript for iteration. */ + // "sourceRoot": "", /* Specify the root path for debuggers to find the reference source code. */ + // "mapRoot": "", /* Specify the location where debugger should locate map files instead of generated locations. */ + // "inlineSources": true, /* Include source code in the sourcemaps inside the emitted JavaScript. */ + // "emitBOM": true, /* Emit a UTF-8 Byte Order Mark (BOM) in the beginning of output files. */ + // "newLine": "crlf", /* Set the newline character for emitting files. */ + // "stripInternal": true, /* Disable emitting declarations that have '@internal' in their JSDoc comments. */ + // "noEmitHelpers": true, /* Disable generating custom helper functions like '__extends' in compiled output. */ + // "noEmitOnError": true, /* Disable emitting files if any type checking errors are reported. */ + // "preserveConstEnums": true, /* Disable erasing 'const enum' declarations in generated code. */ + // "declarationDir": "./", /* Specify the output directory for generated declaration files. */ + // "preserveValueImports": true, /* Preserve unused imported values in the JavaScript output that would otherwise be removed. */ + + /* Interop Constraints */ + // "isolatedModules": true, /* Ensure that each file can be safely transpiled without relying on other imports. */ + // "verbatimModuleSyntax": true, /* Do not transform or elide any imports or exports not marked as type-only, ensuring they are written in the output file's format based on the 'module' setting. */ + // "allowSyntheticDefaultImports": true, /* Allow 'import x from y' when a module doesn't have a default export. */ + "esModuleInterop": true, /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. */ + // "preserveSymlinks": true, /* Disable resolving symlinks to their realpath. This correlates to the same flag in node. */ + "forceConsistentCasingInFileNames": true, /* Ensure that casing is correct in imports. */ + + /* Type Checking */ + "strict": true, /* Enable all strict type-checking options. */ + // "noImplicitAny": true, /* Enable error reporting for expressions and declarations with an implied 'any' type. */ + // "strictNullChecks": true, /* When type checking, take into account 'null' and 'undefined'. */ + // "strictFunctionTypes": true, /* When assigning functions, check to ensure parameters and the return values are subtype-compatible. */ + // "strictBindCallApply": true, /* Check that the arguments for 'bind', 'call', and 'apply' methods match the original function. */ + // "strictPropertyInitialization": true, /* Check for class properties that are declared but not set in the constructor. */ + // "noImplicitThis": true, /* Enable error reporting when 'this' is given the type 'any'. */ + // "useUnknownInCatchVariables": true, /* Default catch clause variables as 'unknown' instead of 'any'. */ + // "alwaysStrict": true, /* Ensure 'use strict' is always emitted. */ + // "noUnusedLocals": true, /* Enable error reporting when local variables aren't read. */ + // "noUnusedParameters": true, /* Raise an error when a function parameter isn't read. */ + // "exactOptionalPropertyTypes": true, /* Interpret optional property types as written, rather than adding 'undefined'. */ + // "noImplicitReturns": true, /* Enable error reporting for codepaths that do not explicitly return in a function. */ + // "noFallthroughCasesInSwitch": true, /* Enable error reporting for fallthrough cases in switch statements. */ + // "noUncheckedIndexedAccess": true, /* Add 'undefined' to a type when accessed using an index. */ + // "noImplicitOverride": true, /* Ensure overriding members in derived classes are marked with an override modifier. */ + // "noPropertyAccessFromIndexSignature": true, /* Enforces using indexed accessors for keys declared using an indexed type. */ + // "allowUnusedLabels": true, /* Disable error reporting for unused labels. */ + // "allowUnreachableCode": true, /* Disable error reporting for unreachable code. */ + + /* Completeness */ + // "skipDefaultLibCheck": true, /* Skip type checking .d.ts files that are included with TypeScript. */ + "skipLibCheck": true /* Skip type checking all .d.ts files. */ + } +} From f0aaac94783e9658c8fac43a326b3f2614c1727a Mon Sep 17 00:00:00 2001 From: Sandeep Kumar Patel Date: Wed, 4 Oct 2023 11:34:07 +0530 Subject: [PATCH 2/2] typesafety, separated in modules, documentation --- README.md | 138 ++++++++++++++++++++++++-------------- backend/actions/socket.ts | 114 +++++++++++++++++++++++++++++++ backend/index.ts | 80 ++++++---------------- backend/types/index.ts | 25 +++++++ backend/utils/rooms.ts | 58 ++++++++++------ backend/utils/users.ts | 79 ++++++++++------------ package-lock.json | 11 +++ package.json | 1 + tsconfig.json | 8 ++- 9 files changed, 336 insertions(+), 178 deletions(-) create mode 100644 backend/actions/socket.ts create mode 100644 backend/types/index.ts diff --git a/README.md b/README.md index e83296328..48fa3703c 100644 --- a/README.md +++ b/README.md @@ -1,92 +1,130 @@ -### Task: Build a Real-Time Chat Application +## Chat Application Backend -In this assignment, your task is to create a real-time chat application using Node.js, Express.js, TypeScript, and Socket.io. This chat application will enable users to communicate with each other by sending text messages and sharing images in real-time within a chat room. +### Introduction -### Requirements: +This documentation summarizes the approach taken for building the backend for a chat application using Node.js, Express, and Socket.IO. The chat application allows users to connect, join rooms, send messages, and leave rooms. This document explains the high-level architecture, the choice of technologies, and key implementation details. -1. **Backend Setup with Node.js, Express.js, TypeScript, and Socket.io:** +### Technologies Used - - Set up a Node.js server using Express.js to handle HTTP requests and Socket.io to enable real-time WebSocket communication. +- Node.js: Chosen for its server-side capabilities, scalability, and extensive package ecosystem. +- Express.js: Used as the web application framework for handling HTTP requests. +- Socket.IO: A WebSocket library for real-time, bidirectional communication between clients and the server. +- Cors: Middleware for enabling Cross-Origin Resource Sharing, allowing communication with different domains. +- TypeScript: Used for server-side scripting and for type safety. +- High-Level Architecture -2. **User Authentication:** +The chat application backend follows a server-client architecture. It uses WebSocket technology to enable real-time communication between clients (users) and the server. - - Implement user authentication to allow users to join the chat room with a unique username. Users should not be able to use the same username simultaneously. +Server: The backend server is responsible for handling HTTP requests, managing WebSocket connections, and facilitating communication between users. +Clients: Users connect to the server via WebSocket connections and interact with each other in real-time. -3. **Chat Room Creation:** +### Key Features and Implementation - - Create a chat room where users can join and exchange messages. Multiple chat rooms may be supported, and users should be able to choose a room to join. +Socket.IO Integration: Socket.IO is integrated into the Express.js application to handle WebSocket connections. When a client connects to the server, a WebSocket connection is established. -4. **Real-Time Text Messaging:** +### User Management: - - Implement real-time text messaging functionality within the chat room. Messages sent by one user should be immediately visible to all other users in the same chat room. +- Users are identified by a unique identifier (id) and a chosen username. -5. **Image Sharing:** +![username](https://imgur.com/yM1wYvo.jpg) - - Enable users to upload and share images within the chat. Images should be uploaded to the server, temporarily stored, and then shared as part of the chat conversation. +![username](https://imgur.com/luqrSwN.jpg) -6. **Error Handling:** +--- - - Implement error handling mechanisms to gracefully handle scenarios such as user disconnections, failed image uploads, or other potential issues that may arise during real-time communication. +Message Handling -7. **Documentation:** +- Users can add their username by emitting the "add_user" event. If the username is taken, they receive a notification. - - Create Postman collection or Swagger documentation for your WebSocket API endpoints. The documentation should provide comprehensive information about the WebSocket events, data structures, and message formats used for communication. +![username](https://imgur.com/eyKZfVu.jpg) -### Submission Details: +![username](https://imgur.com/PuKPTmk.jpg) -To submit your assignment, follow these steps: +![username](https://imgur.com/D1Pesks.jpg) -1. **Fork Repository:** +![username](https://imgur.com/Ivk231x.jpg) - - Fork the provided GitHub repository to create your own copy. +--- -2. **Create Branch:** +- Users can join rooms by emitting the "join_room" event. If a user attempts to join a room they're already in, they receive a notification. - - Create a new branch in your forked repository with your name (e.g., "yourname_assignment"). +![join_room](https://imgur.com/7oXrlZW.jpg) -3. **Commit Regularly:** +![join_room](https://imgur.com/iWVDQ6M.jpg) - - Commit your code regularly to the branch so that your progress can be tracked. +--- -4. **Pull Request:** +- Users can send messages to rooms by emitting the "send_message" event. Messages can include text and optional images. +- Messages are broadcast to all users in the same room. - - Once you have completed the assignment, create a pull request from your branch to the main repository. Replace "main repository" with the URL of the original repository. +![send_message](https://imgur.com/1ksXWsL.jpg) -5. **README.md:** +![send_message](https://imgur.com/xp1wOYt.jpg) - - Include a README.md file in your project repository. This README should explain your approach to building the chat application, any challenges you faced, and any additional features or improvements you would have added if given more time. +![send_message](https://imgur.com/5fxVw1s.jpg) -6. **Documentation Link:** +![send_message](https://imgur.com/0DnQPTU.jpg) - - Include the link to your Postman collection or Swagger documentation in the README.md file. +![send_message](https://imgur.com/ipJzxMf.jpg) -### Evaluation Criteria: +--- -Your assignment will be evaluated based on the following factors: +- Leaving Rooms: +- Users can leave rooms by emitting the "leave_room" event. When a user leaves a room, a message is broadcast to inform others. -- **Technical Proficiency:** - - Demonstrating your skills in using Node.js, Express.js, TypeScript, and Socket.io to build a functional real-time chat application with image sharing. +![leave](https://imgur.com/fGVm11X.jpg) -- **Code Quality:** - - Writing clean, well-structured, and maintainable code with proper comments and strict typing. +![leave](https://imgur.com/BFDCytf.jpg) -- **WebSocket Implementation:** - - Creating WebSocket endpoints and handling real-time communication effectively. +![leave](https://imgur.com/7UWfLtE.jpg) -- **User Authentication:** - - Implementing a secure user authentication system. +--- -- **Image Upload:** - - Allowing users to upload and share images in the chat room. +### Error Handling: -- **Error Handling:** - - Implementing error handling mechanisms for a robust chat application. +The application handles potential errors, such as joining a non-existing room or leaving a room the user never joined which shown in the above images. -- **Documentation:** - - Providing detailed Postman collection or Swagger documentation for the WebSocket API endpoints. +## Conclusion -### Submission Deadline: +The chat application backend provides real-time communication capabilities for users. It's built using Node.js, Express.js, and Socket.IO, making it suitable for chat applications requiring low-latency communication. Proper error handling ensures a smooth user experience, and the application can be easily scaled to accommodate a growing user base. -You have 3-4 days from the date you received this assignment to complete and submit it. +This documentation provides an overview of the approach used to build the chat application backend, including technologies, architecture, key features, and deployment considerations. It serves as a reference for developers and stakeholders involved in the project. -Good luck with the assignment! If you have any questions during the development process, feel free to reach out for clarification. Happy coding! +## Additional Features to Implement in Future: + +Frontend Implementaion: + +Implement frontend using Reactjs or Nextjs. + +User Authentication: + +Implement user authentication to ensure that only registered users can access the chat. +Add features like user registration, login, and password reset functionality. + +Private Messaging: + +Enable users to send private messages to specific users within a room. +Implement a feature for users to create private rooms for one-on-one conversations. + +Message History: + +Store and retrieve chat message history so that users can view previous messages when joining a room. +Implement pagination or infinite scroll for browsing through older messages. + +Notifications: + +Implement push notifications to alert users to new messages or mentions when they are not actively using the application. +Provide notification settings to allow users to customize their notification preferences. + +User Profiles: + +Create user profiles where users can set profile pictures and update their personal information. +Allow users to view the profiles of other users. + +User Status: + +Display the online/offline status of users in the chat. +Implement a feature to show when a user was last active. + +Database: +Setting database for storing messages, users profiles, status etc. diff --git a/backend/actions/socket.ts b/backend/actions/socket.ts new file mode 100644 index 000000000..e66af500e --- /dev/null +++ b/backend/actions/socket.ts @@ -0,0 +1,114 @@ +import { Socket } from "socket.io"; +import { Message } from "types"; + +// Import functions for managing rooms and users +import { getRooms, leaveRoom, roomJoin } from "../utils/rooms"; +import { getUser, getUsers, userJoin } from "../utils/users"; + +/** + * Handles a new socket connection and sets up event listeners. + * @param {Socket} socket - The Socket.IO socket representing the connection. + */ +export const handleSocketConnection = (socket: Socket) => { + console.log(`User Connected: ${socket.id}`); + + // Handle 'join_room' event + socket.on("join_room", (room: string) => { + handleJoinRoom(socket, room); + }); + + // Handle 'add_user' event + socket.on("add_user", (username: string) => { + handleAddUser(socket, username); + }); + + // Handle 'send_message' event + socket.on("send_message", (params: Message) => { + handleSendMessage(socket, params); + }); + + // Handle 'leave_room' event + socket.on("leave_room", (room: string) => { + handleLeaveRoom(socket, room); + }); +}; + +/** + * Handles the 'join_room' event, allowing a user to join a room. + * @param {Socket} socket - The Socket.IO socket representing the connection. + * @param {string} room - The name of the room to join. + */ +const handleJoinRoom = (socket: Socket, room: string) => { + if (!roomJoin(room, socket.id)) { + // Notify the user that they have already joined the room + socket.emit("username", "User already joined the room"); + } else { + // Join the room and notify the user + socket.join(room); + socket.emit("username", "User joined the room"); + console.log(getRooms()); + } +}; + +/** + * Handles the 'add_user' event, allowing a user to join with a username. + * @param {Socket} socket - The Socket.IO socket representing the connection. + * @param {string} username - The username to be assigned to the user. + */ +const handleAddUser = (socket: Socket, username: string) => { + if (!userJoin(socket.id, username)) { + // Notify the user that the chosen username is already taken + socket.emit("username", `Username ${username} already taken`); + + // console.log(getUsers()); + } else { + // Notify the user that their username has been submitted successfully + socket.emit("username", `Username ${username} submitted successfully`); + console.log(getUsers()); + } +}; + +/** + * Handles the 'send_message' event, allowing a user to send a message or image to a room. + * @param {Socket} socket - The Socket.IO socket representing the connection. + * @param {Message} params - The message parameters, including message content, image, and room. + */ +const handleSendMessage = (socket: Socket, params: Message) => { + const { message, img, room } = params; + + let username: string | undefined = getUser(socket.id); + if (!username) username = socket.id; + + if (!message && !img) { + // Log an error if no message or image is provided + console.error("Please send any message or image"); + } else if (!message) { + // Broadcast the image to the room + socket.broadcast.to(room).emit("receive_image", { username, img }); + } else { + // Broadcast the message to the room + socket.broadcast.to(room).emit("receive_message", { username, message }); + } +}; + +/** + * Handles the 'leave_room' event, allowing a user to leave a room. + * @param {Socket} socket - The Socket.IO socket representing the connection. + * @param {string} room - The name of the room to leave. + */ +const handleLeaveRoom = (socket: Socket, room: string) => { + // Broadcast a message to the room when a user leaves + if (leaveRoom(socket.id, room)) { + let username: string | undefined = getUser(socket.id); + if (!username) username = socket.id; + + socket.broadcast + .to(room) + .emit("receive_message", `${username} has left the chat`); + socket.leave(room); + + console.log(getRooms()); + } else { + console.error("You cannot leave because you did not join the room before"); + } +}; diff --git a/backend/index.ts b/backend/index.ts index 6e97a4a03..b3bfdca63 100644 --- a/backend/index.ts +++ b/backend/index.ts @@ -1,78 +1,36 @@ -const { getUsers } = require("./utils/users"); -const { userJoin } = require("./utils/users"); -const { getRooms } = require("./utils/rooms"); -const { roomJoin } = require("./utils/rooms"); -const { leaveRoom } = require("./utils/rooms"); +import express from "express"; +import http from "http"; +import cors from "cors"; +import { Socket, Server } from "socket.io"; -const express = require("express"); -const http = require("http"); -const { Server } = require("socket.io"); -const cors = require("cors"); +// Import the function to handle socket connections +import { handleSocketConnection } from "./actions/socket"; +// Create an Express application const app = express(); +// Enable Cross-Origin Resource Sharing (CORS) app.use(cors()); +// Create an HTTP server using Express const server = http.createServer(app); +// Create a Socket.IO server instance, configuring CORS settings const io = new Server(server, { cors: { - origin: true, + origin: true, // You can specify the allowed origins here // origin: "http://locahost:3000", methods: ["GET", "POST"], }, }); -interface messageProps { - username: string; - message: string; - room: string; -} - -io.on("connection", (socket: any) => { - console.log(`User Connected: ${socket.id}`); - - socket.on("join_room", (data: string) => { - if (!roomJoin(data, socket.id)) { - socket.emit("username", `User already joined the room`); - } else { - socket.join(data); - socket.emit("username", `User joined the room`); - console.log(getRooms()); - } - - console.log(data, "room"); - }); - - socket.on("add_user", (username: string) => { - if (!userJoin(socket.id, username)) { - socket.emit("username", `Username ${username} already exists`); - } else { - socket.emit("username", `Username ${username} submitted successfully`); - console.log(getUsers()); - } - }); - - socket.on("send_message", (data: messageProps) => { - // socket.broadcast.emit("receive_message", data); - socket.broadcast.to(data.room).emit("receive_message", data.message); - console.log(typeof data.room, data.message); - }); - - socket.on("leave_room", (data: string) => { - console.log("dis", data); - - if (leaveRoom(socket.id, data)) { - socket.broadcast - .to(data) - .emit("receive_message", "A user has left the chat"); - socket.leave(data); - } else { - console.log( - "You cannot leave because you did not joined the room before" - ); - } - }); +// Handle incoming socket connections +io.on("connection", (socket: Socket) => { + handleSocketConnection(socket); }); -server.listen(5000, () => console.log("Server started on PORT 5000")); +// Define the server's port, using the specified environment variable or a default value +const PORT = process.env.PORT || 5000; + +// Start the server and listen on the specified port +server.listen(PORT, () => console.log(`Server started on PORT ${PORT}`)); diff --git a/backend/types/index.ts b/backend/types/index.ts new file mode 100644 index 000000000..437f7715c --- /dev/null +++ b/backend/types/index.ts @@ -0,0 +1,25 @@ +/** + * Represents a message object containing information about a message, image, username, and room. + */ +export type Message = { + username: string; // The username of the sender + message?: string; // The text message (optional) + img?: string; // The image URL (optional) + room: string; // The room in which the message is sent +}; + +/** + * Represents a user object with a unique identifier and a username. + */ +export type User = { + id: string; // The unique identifier for the user + username: string; // The username of the user +}; + +/** + * Represents a room object with a unique identifier and an array of user IDs. + */ +export type Room = { + room: string; // The unique identifier for the room + usersID: string[]; // An array of user IDs in the room +}; diff --git a/backend/utils/rooms.ts b/backend/utils/rooms.ts index 7acf2584b..9a166d830 100644 --- a/backend/utils/rooms.ts +++ b/backend/utils/rooms.ts @@ -1,10 +1,19 @@ -let rooms: { room: string; usersID: string[] }[] = []; +import { Room } from "types"; +// Create an array to store room data +let rooms: Room[] = []; + +/** + * Add a user to a room if they are not already a member. + * @param {string} roomID - The unique identifier for the room. + * @param {string} userID - The unique identifier for the user. + * @returns {boolean} - Returns true if the user was added to the room, false if the user is already a member of the room. + */ export const roomJoin = (roomID: string, userID: string): boolean => { - let room = rooms.find((room) => roomID === room.room); - // console.log(room, "=="); + const room = rooms.find((room) => roomID === room.room); - if (room === undefined) { + if (!room) { + // If the room does not exist, create a new room and add the user const newRoom = { room: roomID, usersID: [userID], @@ -14,36 +23,43 @@ export const roomJoin = (roomID: string, userID: string): boolean => { return true; } - let user = room?.usersID.find((user) => user === userID); + const user = room?.usersID.find((user) => user === userID); if (user) { - return false; + return false; // User is already a member of the room } - room?.usersID.push(userID); + // Add the user to the room + room.usersID.push(userID); return true; }; -export const leaveRoom = (userId: string, roomID: string) => { - let room = rooms.find((room) => roomID === room.room); +/** + * Remove a user from a room. + * @param {string} userID - The unique identifier for the user. + * @param {string} roomID - The unique identifier for the room. + * @returns {boolean} - Returns true if the user was successfully removed from the room, false if the user was not found in the room. + */ +export const leaveRoom = (userID: string, roomID: string): boolean => { + const room = rooms.find((room) => roomID === room.room); - const idx = room?.usersID.indexOf(userId); + if (room) { + const idx = room.usersID.indexOf(userID); - if (idx !== -1 && idx !== undefined) { - room?.usersID.splice(idx, 1); - console.log(rooms); + if (idx !== -1) { + // Remove the user from the room's usersID array + room.usersID.splice(idx, 1); - return true; + return true; + } } return false; - - // const userIndex = room.usersID.indexOf(userId); - - // if (userIndex !== -1) { - // // Remove the user from the usersID array - // room.usersID.splice(userIndex, 1); }; -export const getRooms = () => rooms; +/** + * Get an array of all rooms. + * @returns {Room[]} - An array of room objects. + */ +export const getRooms = (): Room[] => rooms; diff --git a/backend/utils/users.ts b/backend/utils/users.ts index abbe84685..fa6555b48 100644 --- a/backend/utils/users.ts +++ b/backend/utils/users.ts @@ -1,58 +1,51 @@ -let users: { id: string; username: string }[] = []; +import { User } from "types"; +// Create an array to store user data +let users: User[] = []; + +/** + * Add a user to the users array if the username is not already taken. + * @param {string} id - The user's unique identifier. + * @param {string} username - The username to be added. + * @returns {boolean} - Returns true if the user was added, false if the username is taken. + */ export const userJoin = (id: string, username: string): boolean => { - let user = users.find((user) => user.username === username); + // Check if the username is already in use + const user = users.find((user) => user.username === username); if (user) { - return false; + return false; // Username is already taken } + // Add the user to the array users.push({ id, username }); - return true; + return true; // User added successfully }; -export const userLeft = (id: string) => { +/** + * Remove a user from the users array based on their unique identifier. + * @param {string} id - The user's unique identifier. + */ +export const userLeft = (id: string): void => { + // Filter out the user with the specified ID users = users.filter((user) => user.id !== id); }; -export const getUsers = () => users; - -// const users = []; - -// let users: { id: string; username: string }[] = []; - -// // Join user to chat -// function userJoin(id: string, username: string, room: string) { -// const user = { id, username, room }; - -// users.push(user); +/** + * Get the username of a user based on their unique identifier. + * @param {string} id - The user's unique identifier. + * @returns {string | undefined} - Returns the username or undefined if the user is not found. + */ +export const getUser = (id: string): string | undefined => { + // Find the user with the specified ID + const user = users.find((user) => user.id === id); -// return user; -// } - -// // Get current user -// function getCurrentUser(id) { -// return users.find((user) => user.id === id); -// } - -// // User leaves chat -// function userLeave(id) { -// const index = users.findIndex((user) => user.id === id); - -// if (index !== -1) { -// return users.splice(index, 1)[0]; -// } -// } - -// // Get room users -// function getRoomUsers(room) { -// return users.filter((user) => user.room === room); -// } + return user?.username; // Return the username or undefined if not found +}; -// module.exports = { -// userJoin, -// getCurrentUser, -// userLeave, -// getRoomUsers, -// }; +/** + * Get an array of all users currently in the chat. + * @returns {User[]} - An array of user objects. + */ +export const getUsers = (): User[] => users; diff --git a/package-lock.json b/package-lock.json index 871b60deb..936cdd5e2 100644 --- a/package-lock.json +++ b/package-lock.json @@ -19,6 +19,7 @@ "devDependencies": { "@types/express": "^4.17.18", "@types/node": "^20.8.0", + "@types/socket.io": "^3.0.2", "nodemon": "^3.0.1" } }, @@ -186,6 +187,16 @@ "@types/node": "*" } }, + "node_modules/@types/socket.io": { + "version": "3.0.2", + "resolved": "https://registry.npmjs.org/@types/socket.io/-/socket.io-3.0.2.tgz", + "integrity": "sha512-pu0sN9m5VjCxBZVK8hW37ZcMe8rjn4HHggBN5CbaRTvFwv5jOmuIRZEuddsBPa9Th0ts0SIo3Niukq+95cMBbQ==", + "deprecated": "This is a stub types definition. socket.io provides its own type definitions, so you do not need this installed.", + "dev": true, + "dependencies": { + "socket.io": "*" + } + }, "node_modules/abbrev": { "version": "1.1.1", "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz", diff --git a/package.json b/package.json index 556152374..a121a3960 100644 --- a/package.json +++ b/package.json @@ -19,6 +19,7 @@ "devDependencies": { "@types/express": "^4.17.18", "@types/node": "^20.8.0", + "@types/socket.io": "^3.0.2", "nodemon": "^3.0.1" } } diff --git a/tsconfig.json b/tsconfig.json index d70946120..a0d80b0be 100644 --- a/tsconfig.json +++ b/tsconfig.json @@ -11,7 +11,7 @@ // "disableReferencedProjectLoad": true, /* Reduce the number of projects loaded automatically by TypeScript. */ /* Language and Environment */ - "target": "es2016", /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */ + "target": "ES6", /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */ // "lib": [], /* Specify a set of bundled library declaration files that describe the target runtime environment. */ // "jsx": "preserve", /* Specify what JSX code is generated. */ // "experimentalDecorators": true, /* Enable experimental support for legacy experimental decorators. */ @@ -28,8 +28,10 @@ "module": "commonjs", /* Specify what module code is generated. */ "rootDir": "./backend", /* Specify the root folder within your source files. */ // "moduleResolution": "node10", /* Specify how TypeScript looks up a file from a given module specifier. */ - // "baseUrl": "./", /* Specify the base directory to resolve non-relative module names. */ - // "paths": {}, /* Specify a set of entries that re-map imports to additional lookup locations. */ + "baseUrl": "./backend", /* Specify the base directory to resolve non-relative module names. */ + "paths": { + "*": ["*", "backend/*"] + }, /* Specify a set of entries that re-map imports to additional lookup locations. */ // "rootDirs": [], /* Allow multiple folders to be treated as one when resolving modules. */ // "typeRoots": [], /* Specify multiple folders that act like './node_modules/@types'. */ // "types": [], /* Specify type package names to be included without being referenced in a source file. */