├── .gitignore ├── package.json ├── README.md ├── johnbox.js └── LICENSE /.gitignore: -------------------------------------------------------------------------------- 1 | .vscode/ 2 | node_modules/ 3 | certs/ 4 | jackprox.js 5 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "dependencies": { 3 | "ws": "^8.17.0" 4 | } 5 | } 6 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Johnbox 2 | 3 | A private server implementation in NodeJS for modern Jackbox Games services (Ecast / API v2). 4 | 5 | Currently, this server only supports hosting 1 room at a time. 6 | 7 | **This project is not related to or endorsed by Jackbox Games, Inc.** 8 | 9 | ## Supported Software 10 | 11 | ### Tested known working games: 12 | 13 | * The Jackbox Party Pack 7 14 | * Quiplash 3 15 | * Champ'd Up 16 | * Blather Round 17 | * Talking Points 18 | * The Devils and the Details (requires Audience explicitly disabled) 19 | * The Jackbox Party Pack 8 20 | * Job Job (requires Audience explicitly disabled) 21 | * Drawful Animate 22 | * Drawful 2 International 23 | 24 | ### Tested known non-working games: 25 | 26 | * Quiplash 2 InterLASHional 27 | * Quiplash 2 InterLASHional only uses API v2 for gathering server info. Rooms are still handled via blobcast. 28 | * The Jackbox Party Pack 6 29 | * All games in Party Pack 6 only use API v2 for gathering server info. Rooms are still handled via blobcast. 30 | * All games prior use Blobcast / API v1 (likely not the true names), which uses socketio for WebSockets and is currently not supported. 31 | 32 | ## Unimplemented features 33 | 34 | * Object security 35 | * Multiple rooms 36 | * Client reconnection 37 | * Room passcodes 38 | * Audiences 39 | * Moderation features 40 | * UGC (user-made episodes, etc) 41 | * Blobcast / API v1(? what is the real name) 42 | 43 | ## Usage 44 | 45 | This is **NOT** meant to be used in any form of serious environment. This is an experimental testing server, and there is no way to safely configure a web browser to connect to this server currently. 46 | 47 | 1. `npm install ws` to install the WebSockets NodeJS module. 48 | 2. Generate a TLS certificate for the web server to use. 49 | 3. Edit the top of `johnbox.js` to change accessibleHost to a host accessible by all players (e.g. public IP) 50 | * This host must have a valid identity in the TLS certificate generated above 51 | 4. `node johnbox` to start the server. 52 | 5. Redirect the game to connect to your server. `jbg.config.jet` in each minigame folder has a `serverUrl` parameter. -------------------------------------------------------------------------------- /johnbox.js: -------------------------------------------------------------------------------- 1 | /* 2 | Johnbox - Jackbox Games Private Server Implementation 3 | Copyright (C) 2022 InvoxiPlayGames 4 | 5 | This program is free software: you can redistribute it and/or modify 6 | it under the terms of the GNU Affero General Public License as published 7 | by the Free Software Foundation, either version 3 of the License, or 8 | (at your option) any later version. 9 | 10 | This program is distributed in the hope that it will be useful, 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 | GNU Affero General Public License for more details. 14 | 15 | You should have received a copy of the GNU Affero General Public License 16 | along with this program. If not, see . 17 | */ 18 | 19 | var fs = require("fs"); 20 | // var https = require("https"); 21 | var http = require("http"); 22 | var wslib = require("ws"); 23 | const util = require('util') 24 | var URL = require("url"); 25 | 26 | // the host that the custom server is accessible with 27 | var accessibleHost = "192.168.1.10"; 28 | // the TLS certificate / key used for the server 29 | // must have valid SNI for accessibleHost 30 | // var tlsCertificate = "certs/192.168.1.10.pem"; 31 | // var tlsKey = "certs/192.168.1.10-key.pem"; 32 | // the room code to automatically assign to rooms 33 | var roomCode = "JOHN"; 34 | 35 | var appConfigResponse = { 36 | "ok": true, 37 | "body": { 38 | "settings": { 39 | "serverUrl": accessibleHost 40 | } 41 | } 42 | } 43 | var roomsResponse = { 44 | "ok": true, 45 | "body": { 46 | "host": accessibleHost, 47 | "code": roomCode, 48 | "token": "000000000000000000000000" 49 | } 50 | } 51 | var appTag = ""; 52 | var appID = ""; 53 | var roomLocked = false; 54 | var maxPlayers = 0; 55 | var joinRoomsResponse = { 56 | "ok": true, 57 | "body": { 58 | "appId": "", 59 | "appTag": "", 60 | "audienceEnabled": false, 61 | "code": roomCode, 62 | "host": accessibleHost, 63 | "audienceHost": accessibleHost, 64 | "locked": false, 65 | "full": false, 66 | "moderationEnabled": false, 67 | "passwordRequired": false, 68 | "twitchLocked": false, 69 | "locale": "en", 70 | "keepalive": false 71 | } 72 | } 73 | var genericResponse = { 74 | "ok": true, 75 | "body": {} 76 | } 77 | var oldRoomResponse = {"create":true,"server":accessibleHost} 78 | 79 | function httpHandle(req, res) { 80 | console.log('HTTP: ' + req.url); 81 | // Ecast room create 82 | if (req.method == 'POST' && req.url == '/api/v2/rooms') { 83 | var data = ""; 84 | req.on('data', (chunk) => { data+=chunk; }); 85 | req.on('end', () => { 86 | data = JSON.parse(data); 87 | // console.log(data); 88 | appID = data.appId; 89 | appTag = data.appTag; 90 | maxPlayers = data.maxPlayers; 91 | res.writeHead(200, { 'Content-Type': 'application/json' }); 92 | res.end(JSON.stringify(roomsResponse)); 93 | }); 94 | // Ecast app configurations 95 | } else if (req.url.startsWith('/api/v2/app-configs/')) { 96 | res.writeHead(200, { 'Content-Type': 'application/json' }); 97 | res.end(JSON.stringify(appConfigResponse)); 98 | // Ecast room join 99 | } else if (req.url.startsWith('/api/v2/rooms/')) { 100 | if (appID == "") { 101 | // if we don't have an app ID, return 404 102 | res.writeHead(404, { 'Content-Type': 'application/json', 'Access-Control-Allow-Origin': '*' }); 103 | res.end(); 104 | return; 105 | } 106 | res.writeHead(200, { 'Content-Type': 'application/json', 'Access-Control-Allow-Origin': '*' }); 107 | joinRoomsResponse.body.appTag = appTag; 108 | joinRoomsResponse.body.appId = appID; 109 | joinRoomsResponse.body.locked = roomLocked; 110 | joinRoomsResponse.body.full = playerCount >= maxPlayers; 111 | res.end(JSON.stringify(joinRoomsResponse)); 112 | // Unknown 113 | } else { 114 | res.writeHead(200, { 'Content-Type': 'application/json' }); 115 | res.end(JSON.stringify(genericResponse)); 116 | } 117 | } 118 | 119 | const server = http.createServer({ 120 | // cert: fs.readFileSync(tlsCertificate), 121 | // key: fs.readFileSync(tlsKey) 122 | }, httpHandle); 123 | 124 | const wss = new wslib.WebSocketServer({ server }); 125 | 126 | wss.on('connection', function connection(ws, request) { 127 | console.log('WS: ' + request.url); 128 | if (appID == "") { 129 | ws.terminate(); 130 | return; 131 | } 132 | if (request.url.includes("role=host")) HostWSHandler(ws); 133 | if (request.url.includes("role=player")) GuestWSHandler(ws, request.url); 134 | }); 135 | 136 | server.listen(8080, "0.0.0.0"); 137 | 138 | var roomObjects = {}; 139 | var roomVersions = {}; 140 | var roomRestrictions = {}; 141 | var roomAcls = {}; 142 | var roomTypes = {}; 143 | var roomLocks = {}; 144 | var roomFroms = {}; 145 | var presenceMap = {}; 146 | var playerCount = 0; 147 | var hostPC = 2; 148 | var guestPC = []; 149 | 150 | function HostWSHandler(ws) { 151 | // reset state, start new game 152 | playerCount = 0; 153 | presenceMap = {}; 154 | roomObjects = {}; 155 | roomVersions = {}; 156 | roomRestrictions = {}; 157 | roomTypes = {}; 158 | roomLocks = {}; 159 | roomFroms = {}; 160 | guestPC = []; 161 | roomLocked = false; 162 | presenceMap[1] = { socket: ws, id: "1", roles: { host: {} } }; 163 | ws.on('message', function message(data) { 164 | var parsed = JSON.parse(data); 165 | // console.log(util.inspect(parsed, false, null, true)); 166 | var text = false; 167 | var number = false; 168 | var doodle = false; 169 | switch (parsed.opcode) { 170 | case "text/create": 171 | case "text/update": 172 | case "text/set": 173 | text = true; 174 | case "number/create": 175 | case "number/update": 176 | case "number/set": 177 | number = true; 178 | case "doodle/create": 179 | doodle = true; 180 | case "object/create": 181 | case "object/update": 182 | case "object/set": // setting / updating objects to be passed around to players 183 | if (doodle && !text && !number) { 184 | parsed.params["val"] = structuredClone(parsed.params); 185 | delete parsed.params["val"]["acl"]; 186 | } 187 | roomObjects[parsed.params.key] = parsed.params.val; 188 | // if (roomLocks[parsed.params.key] === true) { 189 | // return; 190 | // } 191 | roomLocks[parsed.params.key] = false; 192 | if (roomVersions[parsed.params.key] !== undefined) { 193 | roomVersions[parsed.params.key] += 1; 194 | } else { 195 | roomVersions[parsed.params.key] = 0; 196 | } 197 | if (parsed.params.acl) { 198 | roomAcls[parsed.params.key] = parsed.params.acl[0].split(' '); 199 | } 200 | roomFroms[parsed.params.key] = 1; 201 | console.log("Host modified object", parsed.params.key); 202 | ws.send(JSON.stringify({ "pc": ++hostPC, "re": parsed.seq, "opcode": "ok", "result": {} })); 203 | let opcode = "object"; 204 | if (text) { 205 | opcode = "text"; 206 | } else if (number) { 207 | opcode = "number"; 208 | roomRestrictions[parsed.params.key] = {}; 209 | if (parsed.params.min) 210 | roomRestrictions[parsed.params.key]["min"] = parsed.params.min; 211 | if (parsed.params.max) 212 | roomRestrictions[parsed.params.key]["max"] = parsed.params.max; 213 | if (parsed.params.type) 214 | roomRestrictions[parsed.params.key]["type"] = parsed.params.type; 215 | if (parsed.params.increment) 216 | roomRestrictions[parsed.params.key]["increment"] = parsed.params.increment; 217 | } else if (doodle) { 218 | opcode = "doodle" 219 | roomObjects[parsed.params.key]["lines"] = []; 220 | } 221 | roomTypes[parsed.params.key] = opcode; 222 | for(var i = 2; i <= playerCount + 1; i++) { 223 | // only deliver to clients if the acl allows it 224 | // console.log("host", roomAcls[parsed.params.key]?.[1]); 225 | let shouldnt_send = roomAcls[parsed.params.key] && (roomAcls[parsed.params.key][1] != `id:${i}` && roomAcls[parsed.params.key][1] != 'role:player' && roomAcls[parsed.params.key][1] != '*'); 226 | // console.log(shouldnt_send); 227 | if (shouldnt_send) continue; 228 | let result = parsed.params; 229 | delete result["min"]; 230 | delete result["max"]; 231 | delete result["type"]; 232 | delete result["increment"]; 233 | delete result["accept"]; 234 | delete result["reject"]; 235 | if (number && !text) { 236 | result["restrictions"] = roomRestrictions[parsed.params.key]; 237 | } 238 | if (!doodle || text || number) { 239 | result["version"] = roomVersions[parsed.params.key]; 240 | } else { 241 | result["index"] = roomVersions[parsed.params.key]; 242 | } 243 | result["from"] = 1; 244 | result = { "pc": ++guestPC[i - 2], "opcode": opcode, "result": result }; 245 | // console.log(util.inspect(result, false, null, true)); 246 | presenceMap[i].socket.send(JSON.stringify(result)); 247 | } 248 | break; 249 | case "lock": 250 | console.log("Host locked object", parsed.params.key); 251 | // console.log(util.inspect(parsed, false, null, true)); 252 | roomLocks[parsed.params.key] = true; 253 | let reply = { "pc": ++hostPC, "re": parsed.seq, "opcode": "ok", "result": {} } 254 | // console.log(util.inspect(message, false, null, true)); 255 | ws.send(JSON.stringify(reply)); 256 | break; 257 | case "drop": // delete the room object 258 | delete roomObjects[parsed.params.key]; 259 | delete roomVersions[parsed.params.key]; 260 | delete roomRestrictions[parsed.params.key]; 261 | delete roomTypes[parsed.params.key]; 262 | delete roomLocks[parsed.params.key]; 263 | delete roomFroms[parsed.params.key]; 264 | delete roomAcls[parsed.params.key]; 265 | console.log("Host dropped object", parsed.params.key); 266 | ws.send(JSON.stringify({ "pc": ++hostPC, "re": parsed.seq, "opcode": "ok", "result": {} })); 267 | break; 268 | case "room/get-audience": // we don't support audiences, but just return 0 269 | ws.send(JSON.stringify({ "pc": ++hostPC, "re": parsed.seq, "opcode": "room/get-audience", "result": {"connections": 0} })); 270 | break; 271 | case "room/lock": 272 | roomLocked = true; 273 | console.log("Host locked room"); 274 | ws.send(JSON.stringify({ "pc": ++hostPC, "re": parsed.seq, "opcode": "ok", "result": {} })); 275 | break; 276 | case "room/exit": // kick all players 277 | console.log("Host closed room"); 278 | appID = ""; // set app ID to nothing so rooms request fails 279 | for(var i = 2; i <= playerCount + 1; i++) { 280 | presenceMap[i].socket.terminate(); // disconnect all players 281 | presenceMap[i] = {}; 282 | } 283 | ws.send(JSON.stringify({ "pc": ++hostPC, "re": parsed.seq, "opcode": "ok", "result": {} })); 284 | ws.terminate(); 285 | break; 286 | case "text/filter": // Passes text to ecast to check for banned content, just looks for a default OK in response, TODO? 287 | case "game/start": // Probably telemetry, expects a default OK in response, TODO? 288 | case "room/start-audience": // start audience?, TODO 289 | default: 290 | // just ignore and return default OK 291 | console.log("Unimplemented host opcode", parsed.opcode, "with data", util.inspect(parsed, false, null, true)); 292 | let message = { "pc": ++hostPC, "re": parsed.seq, "opcode": "ok", "result": {} }; 293 | // console.log(message) 294 | ws.send(JSON.stringify(message)); 295 | break; 296 | } 297 | }); 298 | ws.on('close', function close() { 299 | appID = ""; // set app ID to nothing so rooms request fails 300 | for(var i = 2; i <= playerCount + 1; i++) { 301 | presenceMap[i].socket.terminate(); // disconnect all players 302 | presenceMap[i] = {}; 303 | } 304 | }); 305 | // send welcome message 306 | console.log("Sending host welcome."); 307 | ws.send(JSON.stringify({ 308 | "pc": ++hostPC, 309 | "opcode": "client/welcome", 310 | "result": { 311 | "id": 1, 312 | "secret": "000000000000000000000000", 313 | "reconnect": false, 314 | "deviceId": "0000000000.0000000000000000000000", 315 | "entities": {}, 316 | "here": {}, 317 | "profile": null 318 | } 319 | })); 320 | } 321 | 322 | function GuestWSHandler(ws, url) { 323 | if (appID == "" || roomLocked || playerCount >= maxPlayers) { 324 | console.log("Client tried to connect while no room, locked or full."); 325 | ws.terminate(); 326 | return; 327 | } 328 | guestPC.push(2); 329 | var playerID = playerCount; 330 | var username = URL.parse(url, true).query["name"] ? URL.parse(url, true).query["name"] : `JOHN ${playerID + 1}`; 331 | playerCount++; 332 | presenceMap[1 + playerCount] = { socket: ws, id: `${1+playerCount}`, roles: { player: { name: username } } }; 333 | ws.on('message', function message(data) { 334 | var parsed = JSON.parse(data); 335 | var text = false; 336 | var number = false; 337 | var doodle = false; 338 | switch (parsed.opcode) { 339 | case "text/update": 340 | case "text/set": 341 | text = true; 342 | case "number/update": 343 | case "number/set": 344 | number = true; 345 | case "doodle/stroke": 346 | doodle = true; 347 | case "object/update": 348 | case "object/set": // setting / updating objects to be passed around to players 349 | // TODO: implement permissions checks 350 | if (roomVersions[parsed.params.key] >= 0) { // only update object if it exists 351 | if (roomLocks[parsed.params.key] === true) { 352 | return; 353 | } 354 | roomLocks[parsed.params.key] = false; 355 | // verify that the ACL allows the object to be edited 356 | // if (roomAcls[parsed.params.key] && (roomAcls[parsed.params.key][1] != `id:${2 + playerID}` && roomAcls[parsed.params.key][1] != '*')) return; 357 | if (!doodle || text || number) { 358 | roomObjects[parsed.params.key] = parsed.params.val; 359 | } else { 360 | roomObjects[parsed.params.key]["lines"].push(...parsed.params.points); 361 | } 362 | console.log("Client", 2 + playerID, "modified object", parsed.params.key); 363 | roomVersions[parsed.params.key] += 1; 364 | roomFroms[parsed.params.key] = 2 + playerID; 365 | let result = parsed.params; 366 | if (!doodle || text || number) { 367 | result["version"] = roomVersions[parsed.params.key]; 368 | } else { 369 | result["index"] = roomVersions[parsed.params.key]; 370 | result["val"] = structuredClone(result); 371 | delete result["val"]["key"]; 372 | } 373 | result["from"] = 2 + playerID; 374 | let opcode = "object"; 375 | if (text) { 376 | opcode = "text"; 377 | } else if (number) { 378 | opcode = "number"; 379 | } else if (doodle) { 380 | opcode = "doodle/line"; 381 | } 382 | let message = { "pc": ++hostPC, "opcode": opcode, "result": result }; 383 | presenceMap[1].socket.send(JSON.stringify(message)); 384 | } 385 | ws.send(JSON.stringify({ "pc": ++guestPC[playerID], "re": parsed.seq, "opcode": "ok", "result": {} })); 386 | break; 387 | case "text/get": 388 | text = true 389 | case "number/get": 390 | number = true 391 | case "doodle/get": 392 | doodle = true 393 | case "object/get": 394 | if (roomVersions[parsed.params.key] >= 0) { // only get object if exists 395 | let result = parsed.params; 396 | result["val"] = roomObjects[parsed.params.key]; 397 | if (!doodle || text || number) { 398 | result["version"] = roomVersions[parsed.params.key]; 399 | } else { 400 | result["index"] = roomVersions[parsed.params.key]; 401 | delete result["val"]["key"]; 402 | } 403 | result["from"] = roomFroms[parsed.params.key]; 404 | let opcode = "object"; 405 | if (text) { 406 | opcode = "text"; 407 | } else if (number) { 408 | opcode = "number"; 409 | } else if (doodle) { 410 | opcode = "doodle" 411 | } 412 | delete result["min"]; 413 | delete result["max"]; 414 | delete result["type"]; 415 | delete result["increment"]; 416 | delete result["accept"]; 417 | delete result["reject"]; 418 | delete result["acl"]; 419 | if (number && !text) { 420 | result["restrictions"] = roomRestrictions[parsed.params.key]; 421 | } 422 | let message = { "pc": ++guestPC[playerID], "re": parsed.seq, "opcode": opcode, "result": result }; 423 | console.log(util.inspect(message, false, null, true)); 424 | ws.send(JSON.stringify(message)); 425 | } 426 | break; 427 | case "lock": 428 | console.log("Client", 2 + playerID, "locked object", parsed.params.key); 429 | // console.log(util.inspect(parsed, false, null, true)); 430 | roomLocks[parsed.params.key] = true; 431 | let message = { "pc": ++guestPC[playerID], "re": parsed.seq, "opcode": "ok", "result": {} } 432 | // console.log(util.inspect(message, false, null, true)); 433 | ws.send(JSON.stringify(message)); 434 | message = { "pc": ++hostPC, "opcode": "lock", "result": { "key": parsed.params.key, "from": 2 + playerID } }; 435 | // console.log(util.inspect(message, false, null, true)); 436 | presenceMap[1].socket.send(JSON.stringify(message)); 437 | break; 438 | case "client/send": 439 | console.log("Client", parsed.params.from, "sent data to", parsed.params.to, ":", parsed.params.body); 440 | // send it to host, TODO: check how this is supposed to behave 441 | presenceMap[1].socket.send(JSON.stringify({ "pc": ++hostPC, "opcode": "client/send", "result": parsed.params })); 442 | ws.send(JSON.stringify({ "pc": ++guestPC[playerID], "re": parsed.seq, "opcode": "ok", "result": {} })); 443 | break; 444 | default: 445 | // just ignore and return default OK 446 | console.log("Unimplemented client opcode", parsed.opcode, "with data", parsed); 447 | ws.send(JSON.stringify({ "pc": ++guestPC[playerID], "re": parsed.seq, "opcode": "ok", "result": {} })); 448 | break; 449 | } 450 | }); 451 | // send welcome message 452 | console.log("Sending client welcome."); 453 | 454 | var clientWelcome = { 455 | "pc": ++guestPC[playerID], 456 | "opcode": "client/welcome", 457 | "result": { 458 | "id": 1 + playerCount, 459 | "name": username, 460 | "secret": "00000000-0000-0000-0000-000000000000", 461 | "reconnect": false, 462 | "deviceId": "0000000000.0000000000000000000000", 463 | "entities": {}, 464 | "here": {}, 465 | "profile":{ 466 | "id": 1 + playerCount, 467 | "roles": { 468 | "player": { "name": username } 469 | } 470 | } 471 | } 472 | }; 473 | for(var i = 1; i <= playerCount; i++) { 474 | clientWelcome.result.here[`${i}`] = {}; 475 | Object.assign(clientWelcome.result.here[`${i}`], presenceMap[i]); 476 | delete clientWelcome.result.here[`${i}`].socket; 477 | } 478 | var objectKeys = Object.keys(roomObjects); 479 | for(var i = 0; i < objectKeys.length; i++) { 480 | // only deliver to clients if the acl allows it 481 | // console.log("guest", roomAcls[objectKeys[i]]?.[1]) 482 | let role = ((1 + playerCount) == 1) ? 'role:host' : 'role:player'; 483 | let shouldnt_send = roomAcls[objectKeys[i]] && (roomAcls[objectKeys[i]][1] != `id:${1 + playerCount}` && roomAcls[objectKeys[i]][1] != role && roomAcls[objectKeys[i]][1] != '*'); 484 | // console.log(shouldnt_send); 485 | if (shouldnt_send) continue; 486 | clientWelcome.result.entities[objectKeys[i]] = [ roomTypes[objectKeys[i]], { key: objectKeys[i], val: roomObjects[objectKeys[i]], version: roomVersions[objectKeys[i]], from: 1 }, { "locked": roomLocks[objectKeys[i]] } ]; 487 | } 488 | // console.log(util.inspect(clientWelcome, false, null, true)); 489 | ws.send(JSON.stringify(clientWelcome)); 490 | // send client connected message 491 | var clientConnected = { 492 | "pc": ++hostPC, 493 | "opcode": "client/connected", 494 | "result": { 495 | "id": 1 + playerCount, 496 | "userId": `00000000-0000-0000-0000-00000000000${playerCount}`, 497 | "name": username, 498 | "role": "player", 499 | "reconnect": false, 500 | "profile": { 501 | "id": 1 + playerCount, 502 | "roles": { 503 | "player": { "name": username } 504 | } 505 | } 506 | } 507 | }; 508 | presenceMap[1].socket.send(JSON.stringify(clientConnected)); 509 | } 510 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU AFFERO GENERAL PUBLIC LICENSE 2 | Version 3, 19 November 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU Affero General Public License is a free, copyleft license for 11 | software and other kinds of works, specifically designed to ensure 12 | cooperation with the community in the case of network server software. 13 | 14 | The licenses for most software and other practical works are designed 15 | to take away your freedom to share and change the works. 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Remote Network Interaction; Use with the GNU General Public License. 541 | 542 | Notwithstanding any other provision of this License, if you modify the 543 | Program, your modified version must prominently offer all users 544 | interacting with it remotely through a computer network (if your version 545 | supports such interaction) an opportunity to receive the Corresponding 546 | Source of your version by providing access to the Corresponding Source 547 | from a network server at no charge, through some standard or customary 548 | means of facilitating copying of software. This Corresponding Source 549 | shall include the Corresponding Source for any work covered by version 3 550 | of the GNU General Public License that is incorporated pursuant to the 551 | following paragraph. 552 | 553 | Notwithstanding any other provision of this License, you have 554 | permission to link or combine any covered work with a work licensed 555 | under version 3 of the GNU General Public License into a single 556 | combined work, and to convey the resulting work. The terms of this 557 | License will continue to apply to the part which is the covered work, 558 | but the work with which it is combined will remain governed by version 559 | 3 of the GNU General Public License. 560 | 561 | 14. Revised Versions of this License. 562 | 563 | The Free Software Foundation may publish revised and/or new versions of 564 | the GNU Affero General Public License from time to time. Such new versions 565 | will be similar in spirit to the present version, but may differ in detail to 566 | address new problems or concerns. 567 | 568 | Each version is given a distinguishing version number. If the 569 | Program specifies that a certain numbered version of the GNU Affero General 570 | Public License "or any later version" applies to it, you have the 571 | option of following the terms and conditions either of that numbered 572 | version or of any later version published by the Free Software 573 | Foundation. If the Program does not specify a version number of the 574 | GNU Affero General Public License, you may choose any version ever published 575 | by the Free Software Foundation. 576 | 577 | If the Program specifies that a proxy can decide which future 578 | versions of the GNU Affero General Public License can be used, that proxy's 579 | public statement of acceptance of a version permanently authorizes you 580 | to choose that version for the Program. 581 | 582 | Later license versions may give you additional or different 583 | permissions. However, no additional obligations are imposed on any 584 | author or copyright holder as a result of your choosing to follow a 585 | later version. 586 | 587 | 15. Disclaimer of Warranty. 588 | 589 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 590 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 591 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 592 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 593 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 594 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 595 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 596 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 597 | 598 | 16. Limitation of Liability. 599 | 600 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 601 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 602 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 603 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 604 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 605 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 606 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 607 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 608 | SUCH DAMAGES. 609 | 610 | 17. Interpretation of Sections 15 and 16. 611 | 612 | If the disclaimer of warranty and limitation of liability provided 613 | above cannot be given local legal effect according to their terms, 614 | reviewing courts shall apply local law that most closely approximates 615 | an absolute waiver of all civil liability in connection with the 616 | Program, unless a warranty or assumption of liability accompanies a 617 | copy of the Program in return for a fee. 618 | 619 | END OF TERMS AND CONDITIONS 620 | 621 | How to Apply These Terms to Your New Programs 622 | 623 | If you develop a new program, and you want it to be of the greatest 624 | possible use to the public, the best way to achieve this is to make it 625 | free software which everyone can redistribute and change under these terms. 626 | 627 | To do so, attach the following notices to the program. It is safest 628 | to attach them to the start of each source file to most effectively 629 | state the exclusion of warranty; and each file should have at least 630 | the "copyright" line and a pointer to where the full notice is found. 631 | 632 | 633 | Copyright (C) 634 | 635 | This program is free software: you can redistribute it and/or modify 636 | it under the terms of the GNU Affero General Public License as published 637 | by the Free Software Foundation, either version 3 of the License, or 638 | (at your option) any later version. 639 | 640 | This program is distributed in the hope that it will be useful, 641 | but WITHOUT ANY WARRANTY; without even the implied warranty of 642 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 643 | GNU Affero General Public License for more details. 644 | 645 | You should have received a copy of the GNU Affero General Public License 646 | along with this program. If not, see . 647 | 648 | Also add information on how to contact you by electronic and paper mail. 649 | 650 | If your software can interact with users remotely through a computer 651 | network, you should also make sure that it provides a way for users to 652 | get its source. For example, if your program is a web application, its 653 | interface could display a "Source" link that leads users to an archive 654 | of the code. There are many ways you could offer source, and different 655 | solutions will be better for different programs; see section 13 for the 656 | specific requirements. 657 | 658 | You should also get your employer (if you work as a programmer) or school, 659 | if any, to sign a "copyright disclaimer" for the program, if necessary. 660 | For more information on this, and how to apply and follow the GNU AGPL, see 661 | . --------------------------------------------------------------------------------