feat(node): node.js client

node/.gitignore

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+*.js
+node_modules/

node/client.ts

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+import WebSocket from 'ws';
+import net from 'net';
+
+const DEFAULT_REMOTE_SERVER = 'wss://e4mc.skyevg.systems';
+const DEFAULT_TCP_ADDRESS = 'localhost';
+const DEFAULT_TCP_PORT = 25565;
+
+interface DomainAssignedMessage {
+  DomainAssigned: string;
+}
+
+interface ChannelOpenMessage {
+  ChannelOpen: [number, string];
+}
+
+interface ChannelClosedMessage {
+  ChannelClosed: number;
+}
+
+type ServerMessage = DomainAssignedMessage | ChannelOpenMessage | ChannelClosedMessage;
+
+class e4mcClient {
+  private tcpAddress: string;
+  private tcpPort: number;
+  private channels: Map<number, net.Socket>;
+  private pendingData: Map<number, Buffer[]>;
+  private ws: WebSocket;
+  private onDomainAssigned: ((domain: string) => void) | undefined;
+
+  constructor(onDomainAssigned?: (domain: string) => void, tcpPort?: number, tcpAddress?: string, remoteServer?: string) {
+    this.tcpAddress = tcpAddress ?? DEFAULT_TCP_ADDRESS;
+    this.tcpPort = tcpPort ?? DEFAULT_TCP_PORT;
+    this.channels = new Map();
+    this.pendingData = new Map();
+    this.onDomainAssigned = onDomainAssigned;
+
+    this.ws = new WebSocket(remoteServer ?? DEFAULT_REMOTE_SERVER);
+    this.ws.on('open', () => this.onOpen());
+    this.ws.on('message', (data: Buffer, isBinary: boolean) => this.onMessage(data, isBinary));
+  }
+
+  onOpen() {
+    console.log('Connected to the remote server.');
+  }
+
+  onMessage(data: Buffer, isBinary: boolean) {
+    if (!isBinary) {
+      const message: ServerMessage = JSON.parse(data.toString());
+
+      if ('DomainAssigned' in message) {
+        console.log('Domain assigned:', message.DomainAssigned);
+        if (this.onDomainAssigned) {
+          this.onDomainAssigned(message.DomainAssigned);
+        }
+      } else if ('ChannelOpen' in message) {
+        this.onChannelOpen(...message.ChannelOpen);
+      } else if ('ChannelClosed' in message) {
+        this.onChannelClosed(message.ChannelClosed);
+      }
+    } else {
+      this.onBinaryMessage(data);
+    }
+  }
+
+  onChannelOpen(channelId: number, clientInfo: string) {
+    console.log(`Opening channel ${channelId} for ${clientInfo}`);
+
+    const tcpSocket = net.createConnection({ host: this.tcpAddress, port: this.tcpPort }, () => {
+      console.log(`TCP connection established for channel ${channelId}`);
+    });
+
+    tcpSocket.on('data', (chunk) => {
+      const data = Buffer.concat([Buffer.from([channelId]), chunk]);
+      this.ws.send(data);
+    });
+
+    tcpSocket.on('close', () => {
+      console.log(`TCP connection closed for channel ${channelId}`);
+      this.ws.send(JSON.stringify({ ChannelClosed: channelId }));
+      this.channels.delete(channelId);
+    });
+
+    this.channels.set(channelId, tcpSocket);
+
+    if (this.pendingData.has(channelId)) {
+      this.pendingData.get(channelId)?.forEach((chunk) => {
+        tcpSocket.write(chunk);
+      });
+      this.pendingData.delete(channelId);
+    }
+  }
+
+  onChannelClosed(channelId: number) {
+    console.log(`Closing channel ${channelId}`);
+    if (this.channels.has(channelId)) {
+      this.channels.get(channelId)?.end();
+      this.channels.delete(channelId);
+    }
+  }
+
+  onBinaryMessage(data: Buffer) {
+    const channelId = data.readUInt8(0);
+    const payload = data.slice(1);
+    if (this.channels.has(channelId)) {
+      this.channels.get(channelId)?.write(payload);
+    } else {
+      if (!this.pendingData.has(channelId)) {
+        this.pendingData.set(channelId, []);
+      }
+      this.pendingData.get(channelId)?.push(payload);
+    }
+  }
+}
+
+export default e4mcClient;

node/package.json

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+{
+  "name": "e4mc-client-node",
+  "version": "1.0.0",
+  "main": "client.js",
+  "license": "MIT",
+  "devDependencies": {
+    "@types/node": "^18.15.11",
+    "@types/ws": "^8.5.4",
+    "typescript": "^5.0.3"
+  },
+  "dependencies": {
+    "ws": "^8.13.0"
+  }
+}

node/tsconfig.json

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+{
+  "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": "./",                                  /* 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 '<reference>'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": "./",                                   /* 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. */
+  }
+}

node/yarn.lock

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+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+"@types/node@*", "@types/node@^18.15.11":
+  version "18.15.11"
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+
+"@types/ws@^8.5.4":
+  version "8.5.4"
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+  dependencies:
+    "@types/node" "*"
+
+typescript@^5.0.3:
+  version "5.0.3"
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+
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+  version "8.13.0"
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