Automated Action 545563e776 Implement comprehensive real-time chat API with NestJS
- Complete NestJS TypeScript implementation with WebSocket support
- Direct messaging (DM) and group chat functionality
- End-to-end encryption with AES encryption and key pairs
- Media file support (images, videos, audio, documents) up to 100MB
- Push notifications with Firebase Cloud Messaging integration
- Mention alerts and real-time typing indicators
- User authentication with JWT and Passport
- SQLite database with TypeORM entities and relationships
- Comprehensive API documentation with Swagger/OpenAPI
- File upload handling with secure access control
- Online/offline status tracking and presence management
- Message editing, deletion, and reply functionality
- Notification management with automatic cleanup
- Health check endpoint for monitoring
- CORS configuration for cross-origin requests
- Environment-based configuration management
- Structured for Flutter SDK integration

Features implemented:
 Real-time messaging with Socket.IO
 User registration and authentication
 Direct messages and group chats
 Media file uploads and management
 End-to-end encryption
 Push notifications
 Mention alerts
 Typing indicators
 Message read receipts
 Online status tracking
 File access control
 Comprehensive API documentation

Ready for Flutter SDK development and production deployment.
2025-06-21 17:13:05 +00:00
..

write-file-atomic

This is an extension for node's fs.writeFile that makes its operation atomic and allows you set ownership (uid/gid of the file).

writeFileAtomic(filename, data, [options], [callback])

Description:

Atomically and asynchronously writes data to a file, replacing the file if it already exists. data can be a string or a buffer.

Options:

  • filename String
  • data String | Buffer
  • options Object | String
    • chown Object default, uid & gid of existing file, if any
      • uid Number
      • gid Number
    • encoding String | Null default = 'utf8'
    • fsync Boolean default = true
    • mode Number default, from existing file, if any
    • tmpfileCreated Function called when the tmpfile is created
  • callback Function

Usage:

var writeFileAtomic = require('write-file-atomic')
writeFileAtomic(filename, data, [options], [callback])

The file is initially named filename + "." + murmurhex(__filename, process.pid, ++invocations). Note that require('worker_threads').threadId is used in addition to process.pid if running inside of a worker thread. If writeFile completes successfully then, if passed the chown option it will change the ownership of the file. Finally it renames the file back to the filename you specified. If it encounters errors at any of these steps it will attempt to unlink the temporary file and then pass the error back to the caller. If multiple writes are concurrently issued to the same file, the write operations are put into a queue and serialized in the order they were called, using Promises. Writes to different files are still executed in parallel.

If provided, the chown option requires both uid and gid properties or else you'll get an error. If chown is not specified it will default to using the owner of the previous file. To prevent chown from being ran you can also pass false, in which case the file will be created with the current user's credentials.

If mode is not specified, it will default to using the permissions from an existing file, if any. Expicitly setting this to false remove this default, resulting in a file created with the system default permissions.

If options is a String, it's assumed to be the encoding option. The encoding option is ignored if data is a buffer. It defaults to 'utf8'.

If the fsync option is false, writeFile will skip the final fsync call.

If the tmpfileCreated option is specified it will be called with the name of the tmpfile when created.

Example:

writeFileAtomic('message.txt', 'Hello Node', {chown:{uid:100,gid:50}}, function (err) {
  if (err) throw err;
  console.log('It\'s saved!');
});

This function also supports async/await:

(async () => {
  try {
    await writeFileAtomic('message.txt', 'Hello Node', {chown:{uid:100,gid:50}});
    console.log('It\'s saved!');
  } catch (err) {
    console.error(err);
    process.exit(1);
  }
})();

writeFileAtomicSync(filename, data, [options])

Description:

The synchronous version of writeFileAtomic.

Usage:

var writeFileAtomicSync = require('write-file-atomic').sync
writeFileAtomicSync(filename, data, [options])