app.js

   1 let $ = document; //shortcut
   2
   3 ///////////////////
   4 // Initialisations
   5
   6 // https://stackoverflow.com/a/27747377/12660887
   7 function generateId (len) {
   8   const dec2hex = (dec) => dec.toString(16).padStart(2, "0");
   9   let arr = new Uint8Array(len / 2); //len/2 because 2 chars per hex value
  10   window.crypto.getRandomValues(arr); //fill with random integers
  11   return Array.from(arr, dec2hex).join('');
  12 }
  13
  14 // Populate variants dropdown list
  15 let dropdown = $.getElementById("selectVariant");
  16 dropdown[0] = new Option("? ? ?", "_random", true, true);
  17 dropdown[0].title = "Random variant";
  18 for (let i = 0; i < variants.length; i++) {
  19   let newOption = new Option(
  20     variants[i].disp || variants[i].name, variants[i].name, false, false);
  21   newOption.title = variants[i].desc;
  22   dropdown[dropdown.length] = newOption;
  23 }
  24
  25 // Ensure that I have a socket ID and a name
  26 if (!localStorage.getItem("sid"))
  27   localStorage.setItem("sid", generateId(8));
  28 if (!localStorage.getItem("name"))
  29   localStorage.setItem("name", "@non" + generateId(4));
  30 const sid = localStorage.getItem("sid");
  31 $.getElementById("myName").value = localStorage.getItem("name");
  32
  33 // "Material" input field name
  34 let inputName = document.getElementById("myName");
  35 let formField = document.getElementById("ng-name");
  36 const setActive = (active) => {
  37   if (active)
  38     formField.classList.add("form-field--is-active");
  39   else {
  40     formField.classList.remove("form-field--is-active");
  41     inputName.value == ''
  42       ? formField.classList.remove("form-field--is-filled")
  43       : formField.classList.add("form-field--is-filled");
  44   }
  45 };
  46 setActive(true);
  47 inputName.onblur = () => setActive(false);
  48 inputName.onfocus = () => setActive(true);
  49
  50 /////////
  51 // Utils
  52
  53 function setName() {
  54   // 'onChange' event on name input text field [HTML]
  55   localStorage.setItem("name", $.getElementById("myName").value);
  56 }
  57
  58 // Turn a "tab" on, and "close" all others
  59 function toggleVisible(element) {
  60   for (elt of document.querySelectorAll("main > div")) {
  61     if (elt.id != element)
  62       elt.style.display = "none";
  63     else
  64       elt.style.display = "block";
  65   }
  66   if (element == "boardContainer") {
  67     // Avoid smartphone scrolling effects (TODO?)
  68     document.querySelector("html").style.overflow = "hidden";
  69     document.body.style.overflow = "hidden";
  70   }
  71   else {
  72     document.querySelector("html").style.overflow = "visible";
  73     document.body.style.overflow = "visible";
  74     // Workaround "superposed texts" effect:
  75     if (element == "newGame")
  76       setActive(false);
  77   }
  78 }
  79
  80 let seek_vname;
  81 function seekGame() {
  82   seek_vname = $.getElementById("selectVariant").value;
  83   if (send("seekgame",
  84            {vname: seek_vname, name: localStorage.getItem("name")})
  85   ) {
  86     toggleVisible("pendingSeek");
  87   }
  88 }
  89 function cancelSeek() {
  90   if (send("cancelseek", {vname: seek_vname}))
  91     toggleVisible("newGame");
  92 }
  93
  94 function sendRematch(random) {
  95   if (send("rematch", {gid: gid, random: !!random}))
  96     toggleVisible("pendingRematch");
  97 }
  98 function cancelRematch() {
  99   if (send("norematch", {gid: gid}))
 100     toggleVisible("newGame");
 101 }
 102
 103 // Play with a friend (or not ^^)
 104 function showNewGameForm() {
 105   const vname = $.getElementById("selectVariant").value;
 106   if (vname == "_random")
 107     alert("Select a variant first");
 108   else {
 109     $.getElementById("gameLink").innerHTML = "";
 110     $.getElementById("selectColor").selectedIndex = 0;
 111     toggleVisible("newGameForm");
 112     import(`/variants/${vname}/class.js`).then(module => {
 113       window.V = module.default;
 114       for (const [k, v] of Object.entries(V.Aliases))
 115         window[k] = v;
 116       prepareOptions();
 117     });
 118   }
 119 }
 120 function backToNormalSeek() {
 121   toggleVisible("newGame");
 122 }
 123
 124 function toggleStyle(event, obj) {
 125   const word = obj.innerHTML;
 126   options[word] = !options[word];
 127   event.target.classList.toggle("highlight-word");
 128 }
 129
 130 let options;
 131 function prepareOptions() {
 132   options = {};
 133   let optHtml = "";
 134   if (V.Options.select) {
 135     optHtml += V.Options.select.map(select => { return `
 136       <div class="option-select">
 137         <label for="var_${select.variable}">${select.label}</label>
 138         <div class="select">
 139           <select id="var_${select.variable}" data-numeric="1">` +
 140           select.options.map(option => { return `
 141             <option
 142               value="${option.value}"
 143               ${option.value == select.defaut ? " selected" : ""}
 144             >
 145               ${option.label}
 146             </option>`;
 147           }).join("") + `
 148           </select>
 149           <span class="focus"></span>
 150         </div>
 151       </div>`;
 152     }).join("");
 153   }
 154   if (V.Options.check) {
 155     optHtml += V.Options.check.map(check => { return `
 156       <div class="option-check">
 157         <label class="checkbox">
 158           <input id="var_${check.variable}"
 159                  type="checkbox"${check.defaut ? " checked" : ""}/>
 160           <span class="spacer"></span>
 161           <span>${check.label}</span>
 162         </label>
 163       </div>`;
 164     }).join("");
 165   }
 166   if (V.Options.input) {
 167     optHtml += V.Options.input.map(input => { return `
 168       <div class="option-input">
 169         <label class="input">
 170           <input id="var_${input.variable}"
 171                  type="${input.type}"
 172                  content="${input.defaut}"/>
 173           <span class="spacer"></span>
 174           <span>${input.label}</span>
 175         </label>
 176       </div>`;
 177     }).join("");
 178   }
 179   if (V.Options.styles) {
 180     optHtml += '<div class="words">';
 181     let i = 0;
 182     const stylesLength = V.Options.styles.length;
 183     while (i < stylesLength) {
 184       optHtml += '<div class="row">';
 185       for (let j=i; j<i+4; j++) {
 186         if (j == stylesLength)
 187           break;
 188         const style = V.Options.styles[j];
 189         optHtml += `<span onClick="toggleStyle(event, this)">${style}</span>`;
 190       }
 191       optHtml += "</div>";
 192       i += 4;
 193     }
 194     optHtml += "</div>";
 195   }
 196   $.getElementById("gameOptions").innerHTML = optHtml;
 197 }
 198
 199 function getGameLink() {
 200   const vname = $.getElementById("selectVariant").value;
 201   const color = $.getElementById("selectColor").value;
 202   for (const select of $.querySelectorAll("#gameOptions select")) {
 203     let value = select.value;
 204     if (select.attributes["data-numeric"])
 205       value = parseInt(value, 10);
 206     if (value)
 207       options[ select.id.split("_")[1] ] = value;
 208   }
 209   for (const check of $.querySelectorAll("#gameOptions input")) {
 210     if (check.checked)
 211       options[ check.id.split("_")[1] ] = check.checked;
 212   }
 213   send("creategame", {
 214     vname: vname,
 215     player: {sid: sid, name: localStorage.getItem("name"), color: color},
 216     options: options
 217   });
 218 }
 219
 220 function fillGameInfos(gameInfos, oppIndex) {
 221   fetch(`/variants/${gameInfos.vname}/rules.html`)
 222   .then(res => res.text())
 223   .then(txt => {
 224     let htmlContent = `
 225       <div class="players-info">
 226         <p>
 227           <span class="bold">${gameInfos.vdisp}</span>
 228           <span>vs. ${gameInfos.players[oppIndex].name}</span>
 229         </p>
 230       </div>`;
 231     const options = Object.entries(gameInfos.options);
 232     if (options.length > 0) {
 233       htmlContent += '<div class="options-info">';
 234       let i = 0;
 235       while (i < options.length) {
 236         htmlContent += '<div class="row">';
 237         for (let j=i; j<i+4; j++) {
 238           if (j == options.length)
 239             break;
 240           const opt = options[j];
 241           if (!opt[1])
 242             continue;
 243           htmlContent +=
 244             '<span class="option">' +
 245             (opt[1] === true ? opt[0] : `${opt[0]}:${opt[1]}`) + " " +
 246             "</span>";
 247         }
 248         htmlContent += "</div>";
 249         i += 4;
 250       }
 251       htmlContent += "</div>";
 252     }
 253     htmlContent += `
 254       <div class="rules">${txt}</div>
 255       <div class="btn-wrap">
 256         <button onClick="toggleGameInfos()">Back to game</button>
 257       </div>`;
 258     $.getElementById("gameInfos").innerHTML = htmlContent;
 259   });
 260 }
 261
 262 ////////////////
 263 // Communication
 264
 265 let socket, gid, recoAttempt = 0;
 266 const autoReconnectDelay = () => {
 267   return [100, 200, 500, 1000, 3000, 10000, 30000][Math.min(recoAttempt, 6)];
 268 };
 269
 270 function send(code, data, opts) {
 271   opts = opts || {};
 272   const trySend = () => {
 273     if (socket.readyState == 1) {
 274       socket.send(JSON.stringify(Object.assign({code: code}, data)));
 275       if (opts.success)
 276         opts.success();
 277       return true;
 278     }
 279     return false;
 280   };
 281   const firstTry = trySend();
 282   if (!firstTry) {
 283     if (opts.retry) {
 284       // Retry for a few seconds (sending move)
 285       let sendAttempt = 1;
 286       const retryLoop = setInterval(
 287         () => {
 288           if (trySend() || ++sendAttempt >= 3)
 289             clearInterval(retryLoop);
 290           if (sendAttempt >= 3 && opts.error)
 291             opts.error();
 292         },
 293         1000
 294       );
 295     }
 296     else if (opts.error)
 297       opts.error();
 298   }
 299   return firstTry;
 300 }
 301
 302 function copyClipboard(msg) {
 303   navigator.clipboard.writeText(msg);
 304 }
 305 function getWhatsApp(msg) {
 306   return `https://api.whatsapp.com/send?text=${encodeURIComponent(msg)}`;
 307 }
 308
 309 const tryResumeGame = () => {
 310   recoAttempt = 0;
 311   // If a game is found, resume it:
 312   if (localStorage.getItem("gid")) {
 313     gid = localStorage.getItem("gid");
 314     send("getgame",
 315          {gid: gid},
 316          {
 317            retry: true,
 318            error: () => alert("Cannot load game: no connection")
 319          });
 320   }
 321   else {
 322     // If URL indicates "play with a friend", start game:
 323     const hashIdx = document.URL.indexOf('#');
 324     if (hashIdx >= 0) {
 325       const urlParts = $.URL.split('#');
 326       gid = urlParts[1];
 327       localStorage.setItem("gid", gid);
 328       history.replaceState(null, '', urlParts[0]); //hide game ID
 329       send("joingame",
 330            {gid: gid, name: localStorage.getItem("name")},
 331            {
 332              retry: true,
 333              error: () => alert("Cannot load game: no connection")
 334            });
 335     }
 336   }
 337 };
 338
 339 const messageCenter = (msg) => {
 340   const obj = JSON.parse(msg.data);
 341   switch (obj.code) {
 342     // Start new game:
 343     case "gamestart": {
 344       if (document.hidden)
 345         notifyMe("game");
 346       gid = obj.gid;
 347       initializeGame(obj);
 348       break;
 349     }
 350     // Game vs. friend just created on server: share link now
 351     case "gamecreated": {
 352       const link = `${Params.http_server}/#${obj.gid}`;
 353       $.getElementById("gameLink").innerHTML = `
 354         <p>
 355           <a href="${getWhatsApp(link)}">WhatsApp</a>
 356           /
 357           <span onClick="copyClipboard('${link}')">ToClipboard</span>
 358         </p>
 359         <p>${link}</p>
 360       `;
 361       break;
 362     }
 363     // Game vs. friend joined after 1 minute (try again!)
 364     case "jointoolate":
 365       alert("Game no longer available");
 366       break;
 367     // Get infos of a running game (already launched)
 368     case "gameinfo":
 369       initializeGame(obj);
 370       break;
 371     // Tried to resume a game which is now gone:
 372     case "nogame":
 373       localStorage.removeItem("gid");
 374       break;
 375     // Receive opponent's move:
 376     case "newmove":
 377       // Basic check: was it really opponent's turn?
 378       if (vr.turn == playerColor)
 379         break;
 380       if (document.hidden)
 381         notifyMe("move");
 382       vr.playReceivedMove(obj.moves, () => {
 383         if (vr.getCurrentScore(obj.moves[obj.moves.length-1]) != "*") {
 384           localStorage.removeItem("gid");
 385           setTimeout( () => toggleVisible("gameStopped"), 2000 );
 386         }
 387         else
 388           toggleTurnIndicator(true);
 389       });
 390       break;
 391     // Opponent stopped game (draw, abort, resign...)
 392     case "gameover":
 393       toggleVisible("gameStopped");
 394       localStorage.removeItem("gid");
 395       break;
 396     // Opponent cancelled rematch:
 397     case "closerematch":
 398       toggleVisible("newGame");
 399       break;
 400   }
 401 };
 402
 403 const handleError = (err) => {
 404   if (err.code === "ECONNREFUSED") {
 405     removeAllListeners();
 406     alert("Server refused connection. Please reload page later");
 407   }
 408   socket.close();
 409 };
 410
 411 const handleClose = () => {
 412   setTimeout(() => {
 413     removeAllListeners();
 414     connectToWSS();
 415   }, autoReconnectDelay());
 416 };
 417
 418 function removeAllListeners() {
 419   socket.removeEventListener("open", tryResumeGame);
 420   socket.removeEventListener("message", messageCenter);
 421   socket.removeEventListener("error", handleError);
 422   socket.removeEventListener("close", handleClose);
 423 }
 424
 425 function connectToWSS() {
 426   socket =
 427     new WebSocket(`${Params.socket_server}${Params.socket_path}?sid=${sid}`);
 428   socket.addEventListener("open", tryResumeGame);
 429   socket.addEventListener("message", messageCenter);
 430   socket.addEventListener("error", handleError);
 431   socket.addEventListener("close", handleClose);
 432   recoAttempt++;
 433 }
 434 connectToWSS();
 435
 436 ///////////
 437 // Playing
 438
 439 function toggleTurnIndicator(myTurn) {
 440   let indicator =
 441     $.getElementById("boardContainer").querySelector(".chessboard");
 442   if (myTurn)
 443     indicator.style.outline = "thick solid green";
 444   else
 445     indicator.style.outline = "thick solid lightgrey";
 446 }
 447
 448 function notifyMe(code) {
 449   const doNotify = () => {
 450     // NOTE: empty body (TODO?)
 451     new Notification("New " + code, { vibrate: [200, 100, 200] });
 452     new Audio("/assets/new_" + code + ".mp3").play();
 453   }
 454   if (Notification.permission === "granted")
 455     doNotify();
 456   else if (Notification.permission !== "denied") {
 457     Notification.requestPermission().then(permission => {
 458       if (permission === "granted")
 459         doNotify();
 460     });
 461   }
 462 }
 463
 464 let curMoves = [],
 465     lastFen;
 466 const afterPlay = (move) => {
 467   const callbackAfterSend = () => {
 468     curMoves = [];
 469     const result = vr.getCurrentScore(move);
 470     if (result != "*") {
 471       setTimeout(() => {
 472         toggleVisible("gameStopped");
 473         send("gameover", {gid: gid});
 474       }, 2000);
 475     }
 476   };
 477   // Pack into one moves array, then send
 478   curMoves.push(move);
 479   if (vr.turn != playerColor) {
 480     toggleTurnIndicator(false);
 481     send("newmove",
 482          {gid: gid, moves: curMoves, fen: vr.getFen()},
 483          {
 484            retry: true,
 485            success: callbackAfterSend,
 486            error: () => alert("Move not sent: reload page")
 487          });
 488   }
 489 };
 490
 491 let vr, playerColor;
 492 function initializeGame(obj) {
 493   const options = obj.options || {};
 494   import(`/variants/${obj.vname}/class.js`).then(module => {
 495     window.V = module.default;
 496     for (const [k, v] of Object.entries(V.Aliases))
 497       window[k] = v;
 498     // Load CSS. Avoid loading twice the same stylesheet:
 499     const allIds = [].slice.call($.styleSheets).map(s => s.id);
 500     const newId = obj.vname + "_css";
 501     if (!allIds.includes(newId)) {
 502       $.getElementsByTagName("head")[0].insertAdjacentHTML(
 503         "beforeend",
 504         `<link id="${newId}" rel="stylesheet"
 505                href="/variants/${obj.vname}/style.css"/>`);
 506     }
 507     playerColor = (sid == obj.players[0].sid ? "w" : "b");
 508     // Init + remove potential extra DOM elements from a previous game:
 509     document.getElementById("boardContainer").innerHTML = `
 510       <div id="upLeftInfos"
 511            onClick="toggleGameInfos()">
 512         <svg version="1.1"
 513              viewBox="0.5 0.5 100 100">
 514           <g>
 515             <path d="M50.5,0.5c-27.614,0-50,22.386-50,50c0,27.614,22.386,50,50,50s50-22.386,50-50C100.5,22.886,78.114,0.5,50.5,0.5z M60.5,85.5h-20v-40h20V85.5z M50.5,35.5c-5.523,0-10-4.477-10-10s4.477-10,10-10c5.522,0,10,4.477,10,10S56.022,35.5,50.5,35.5z"/>
 516           </g>
 517         </svg>
 518       </div>
 519       <div id="upRightStop"
 520            onClick="confirmStopGame()">
 521         <svg version="1.1"
 522              viewBox="0 0 533.333 533.333">
 523           <g>
 524             <path d="M528.468,428.468c-0.002-0.002-0.004-0.004-0.006-0.005L366.667,266.666l161.795-161.797 c0.002-0.002,0.004-0.003,0.006-0.005c1.741-1.742,3.001-3.778,3.809-5.946c2.211-5.925,0.95-12.855-3.814-17.62l-76.431-76.43 c-4.765-4.763-11.694-6.024-17.619-3.812c-2.167,0.807-4.203,2.066-5.946,3.807c0,0.002-0.002,0.003-0.005,0.005L266.667,166.666 L104.87,4.869c-0.002-0.002-0.003-0.003-0.005-0.005c-1.743-1.74-3.778-3-5.945-3.807C92.993-1.156,86.065,0.105,81.3,4.869 L4.869,81.3c-4.764,4.765-6.024,11.694-3.813,17.619c0.808,2.167,2.067,4.205,3.808,5.946c0.002,0.001,0.003,0.003,0.005,0.005 l161.797,161.796L4.869,428.464c-0.001,0.002-0.003,0.003-0.004,0.005c-1.741,1.742-3,3.778-3.809,5.945 c-2.212,5.924-0.951,12.854,3.813,17.619L81.3,528.464c4.766,4.765,11.694,6.025,17.62,3.813c2.167-0.809,4.203-2.068,5.946-3.809 c0.001-0.002,0.003-0.003,0.005-0.005l161.796-161.797l161.795,161.797c0.003,0.001,0.005,0.003,0.007,0.004 c1.743,1.741,3.778,3.001,5.944,3.81c5.927,2.212,12.856,0.951,17.619-3.813l76.43-76.432c4.766-4.765,6.026-11.696,3.815-17.62 C531.469,432.246,530.209,430.21,528.468,428.468z"/>
 525           </g>
 526         </svg>
 527       </div>
 528       <div class="resizeable chessboard"></div>`;
 529     vr = new V({
 530       seed: obj.seed, //may be null if FEN already exists (running game)
 531       fen: obj.fen,
 532       element: "boardContainer",
 533       color: playerColor,
 534       afterPlay: afterPlay,
 535       options: options
 536     });
 537     if (!obj.fen) {
 538       // Game creation: both players set FEN, in case of one is offline
 539       send("setfen", {gid: obj.gid, fen: vr.getFen()});
 540       localStorage.setItem("gid", obj.gid);
 541     }
 542     const select = $.getElementById("selectVariant");
 543     obj.vdisp = "";
 544     for (let i=0; i<select.options.length; i++) {
 545       if (select.options[i].value == obj.vname) {
 546         obj.vdisp = select.options[i].text;
 547         break;
 548       }
 549     }
 550     fillGameInfos(obj, playerColor == "w" ? 1 : 0);
 551     if (obj.randvar)
 552       toggleVisible("gameInfos");
 553     else
 554       toggleVisible("boardContainer");
 555     toggleTurnIndicator(vr.turn == playerColor);
 556   });
 557 }
 558
 559 function confirmStopGame() {
 560   if (confirm("Stop game?") && send("gameover", {gid: gid, relay: true})) {
 561     localStorage.removeItem("gid");
 562     toggleVisible("gameStopped");
 563   }
 564 }
 565
 566 function toggleGameInfos() {
 567   if ($.getElementById("gameInfos").style.display == "none")
 568     toggleVisible("gameInfos");
 569   else
 570     toggleVisible("boardContainer");
 571 }
 572
 573 $.body.addEventListener("keydown", (e) => {
 574   if (!localStorage.getItem("gid"))
 575     return;
 576   if (e.keyCode == 27)
 577     confirmStopGame();
 578   else if (e.keyCode == 32) {
 579     e.preventDefault();
 580     toggleGameInfos();
 581   }
 582 });