Mostly using new library, except scoreboard

cmd/mothd/server.go

@@ -169,7 +169,6 @@ func (mh *MothRequestHandler) ThemeOpen(path string) (ReadSeekCloser, time.Time,
 
 // Register associates a team name with a team ID.
 func (mh *MothRequestHandler) Register(teamName string) error {
-	// BUG(neale): Register returns an error if a team is already registered; it may make more sense to return success
 	if teamName == "" {
 		return fmt.Errorf("empty team name")
 	}

theme/background.mjs

@@ -2,9 +2,9 @@ function randint(max) {
     return Math.floor(Math.random() * max)
 }
 
-const MILLISECOND = 1
+const Millisecond = 1
-const SECOND = MILLISECOND * 1000
+const Second = Millisecond * 1000
-const FRAMERATE = 24 / SECOND  // Fast enough for this tomfoolery
+const FrameRate = 24 / Second  // Fast enough for this tomfoolery
 
 class Point {
     constructor(x, y) {
@@ -88,7 +88,7 @@ class QixLine {
  * like the video game "qix"
  */
 class QixBackground {
-    constructor(ctx, frameRate = 6/SECOND) {
+    constructor(ctx, frameRate = 6/Second) {
         this.ctx = ctx
         this.min = new Point(0, 0)
         this.max = new Point(this.ctx.canvas.width, this.ctx.canvas.height)
@@ -110,7 +110,7 @@ class QixBackground {
             new Point(1 + randint(this.box.x / 100), 1 + randint(this.box.y / 100)),
         )
 
-        this.frameInterval = MILLISECOND / frameRate
+        this.frameInterval = Millisecond / frameRate
         this.nextFrame = 0
     }
 
@@ -149,6 +149,12 @@ class QixBackground {
 }
 
 function init() {
+    // Don't like the background animation? You can disable it by setting a
+    // property in localStorage and reloading.
+    if (localStorage.disableBackgroundAnimation) {
+        return
+    }
+
     let canvas = document.createElement("canvas")
     canvas.width = 640
     canvas.height = 640
@@ -159,7 +165,7 @@ function init() {
 
     let qix = new QixBackground(ctx)
     // window.requestAnimationFrame is overkill for something this silly
-    setInterval(() => qix.Animate(), MILLISECOND/FRAMERATE)
+    setInterval(() => qix.Animate(), Millisecond/FrameRate)
 }
 
 if (document.readyState === "loading") {

theme/basic.css

@@ -29,6 +29,15 @@ a:any-link {
   background: red;
   color: white;
 }
+.toast {
+  background: #333;
+  color: #eee;
+  box-shadow: 0px 0px 8px 0px #0b0;
+}
+.debug {
+  background: #ccc;
+  color: black;
+}
 @media (prefers-color-scheme: light) {
   body {
     background: #b9cbd8;
@@ -45,7 +54,8 @@ a:any-link {
 body {
   font-family: sans-serif;
   background-image: url("bg.png");
-  background-size: contain;
+  background-size: cover;
+  background-position: center;
   background-blend-mode: soft-light;
   background-attachment: fixed;
 }
@@ -62,7 +72,7 @@ canvas.wallpaper {
 }
 main {
   max-width: 40em;
-  margin: auto;
+  margin: 1em auto;
   padding: 1px 3px;
   border-radius: 5px;
 }
@@ -85,19 +95,43 @@ input, select {
   padding: 0 1em;
   border-radius: 8px;
 }
+.hidden {
+  display: none;
+}
 
+/** Puzzles list */
+.category {
+  margin: 5px 0;
+  background: #ccc4;
+}
+.category h2 {
+  margin: 0 0.2em;
+}
 nav ul, .category ul {
-  padding: 1em;
+  margin: 0;
+  padding: 0.2em 1em;
+  display: flex;
+  flex-wrap: wrap;
+  gap: 8px 16px;
 }
 nav li, .category li {
 	display: inline;
-	margin: 1em;
 }
-iframe#body {
+.mothball {
-  border: inherit;
+  float: right;
-  width: 100%;
+  text-decoration: none;
+  border-radius: 5px;
+  background: #ccc;
+  padding: 4px 8px;
+  margin: 5px;
 }
-img {
+
+/** Puzzle content */
+#puzzle {
+  border-bottom: solid;
+  padding: 0 0.5em;
+}
+#puzzle img {
   max-width: 100%;
 }
 input:invalid {
@@ -106,9 +140,8 @@ input:invalid {
 .answer_ok {
   cursor: help;
 }
-#messages {
+
-  min-height: 3em;
+/** Scoreboard */
-}
 #rankings {
 	width: 100%;
 	position: relative;
@@ -138,11 +171,17 @@ input:invalid {
 .cat6, .cat14, .cat22 {background-color: #fdbf6f; color: black;}
 .cat7, .cat15, .cat23 {background-color: #ff7f00; color: black;}
 
-
+.debug {
-#devel {
   overflow: auto;
+  padding: 1em;
+  border-radius: 10px;
+  margin: 2em auto;
+}
+.debug dt {
+  font-weight: bold;
 }
 
+/** Draggable items, from the draggable plugin */
 li[draggable]::before {
   content: "↕";
   padding: 0.5em;
@@ -160,6 +199,28 @@ li[draggable] {
   border: 1px white dashed;
 }
 
-#cacheButton.disabled {
+
-  display: none;
+
+
+
+/** Toasts are little pop-up informational messages. */
+ .toasts {
+  position: fixed;
+  z-index: 100;
+  bottom: 10px;
+  left: 10px;
+  text-align: center;
+  width: calc(100% - 20px);
+  display: flex;
+  flex-direction: column;
+}
+.toast {
+  border-radius: 0.5em;
+  padding:  0.2em 2em;
+  animation: fadeIn ease 1s;
+  margin: 2px auto;
+}
+@keyframes fadeIn {
+  0% { opacity: 0; }
+  100% { opacity: 1; }
 }

theme/common.mjs

@@ -0,0 +1,43 @@
+/**
+ * Common functionality
+ */
+const Millisecond = 1
+const Second = Millisecond * 1000
+const Minute = Second * 60
+
+/**
+ * Display a transient message to the user.
+ * 
+ * @param {String} message Message to display
+ * @param {Number} timeout How long before removing this message
+ */
+function Toast(message, timeout=5*Second) {
+    console.info(message)
+    for (let toasts of document.querySelectorAll(".toasts")) {
+        let p = toasts.appendChild(document.createElement("p"))
+        p.classList.add("toast")
+        p.textContent = message
+        setTimeout(() => p.remove(), timeout)
+    }
+}
+
+/**
+ * Run a function when the DOM has been loaded.
+ * 
+ * @param {function():void} cb Callback function
+ */
+function WhenDOMLoaded(cb) {
+    if (document.readyState === "loading") {
+        document.addEventListener("DOMContentLoaded", cb)
+    } else {
+        cb()
+    }    
+}
+
+export {
+    Millisecond,
+    Second,
+    Minute,
+    Toast,
+    WhenDOMLoaded,
+}

theme/index.html

@@ -1,32 +1,34 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
   <head>
     <title>MOTH</title>
     <meta charset="utf-8">
     <meta name="viewport" content="width=device-width">
     <link rel="icon" href="luna-moth.svg">
     <link rel="stylesheet" href="basic.css">
-    <script src="moth.mjs" type="module"></script>
+    <script src="index.mjs" type="module" async></script>
-    <script src="background.mjs" type="module"></script>
+    <script src="background.mjs" type="module" async></script>
   </head>
   <body>
-    <h1 id="title">MOTH</h1>
+    <h1 class="title">MOTH</h1>
     <main>
-      <div id="messages notification">
+      <div class="messages notification">
       </div>
 
-      <form id="login">
+      <form class="login">
         Team ID: <input name="id"> <br>
         Team name: <input name="name"> <br>
         <input type="submit" value="Sign In">
       </form>
 
-      <div id="puzzles"></div>
+      <div class="puzzles"></div>
+
+      <div class="toasts"></div>
     </main>
     <nav>
       <ul>
-        <li><a href="scoreboard.html">Scoreboard</a></li>
+        <li><a href="scoreboard.html" target="_blank">Scoreboard</a></li>
-        <li><a href="logout.html">Sign Out</a></li>
+        <li><button class="logout">Sign Out</button></li>
       </ul>
     </nav>
   </body>

theme/index.mjs

@@ -0,0 +1,158 @@
+/**
+ * Functionality for index.html (Login / Puzzles list)
+ */
+import * as moth from "./moth.mjs"
+import * as common from "./common.mjs"
+
+class App {
+    constructor(basePath=".") {
+        this.server = new moth.Server(basePath)
+
+        let uuid = Math.floor(Math.random() * 1000000).toString(16)
+        this.fakeRegistration = {
+            TeamId: uuid,
+            TeamName: `Team ${uuid}`,
+        }
+
+        for (let form of document.querySelectorAll("form.login")) {
+            form.addEventListener("submit", event => this.handleLoginSubmit(event))
+        }
+        for (let e of document.querySelectorAll(".logout")) {
+            e.addEventListener("click", () => this.Logout())
+        }
+
+        setInterval(() => this.Update(), common.Minute/3)
+        this.Update()
+    }
+
+    handleLoginSubmit(event) {
+        event.preventDefault()
+        console.log(event)
+    }
+    
+    /**
+     * Attempt to log in to the server.
+     * 
+     * @param {String} teamId 
+     * @param {String} teamName 
+     */
+    async Login(teamId, teamName) {
+        try {
+            await this.server.Login(teamId, teamName)
+            common.Toast(`Logged in (team id = ${teamId})`)
+            this.Update()
+        }
+        catch (error) {
+            common.Toast(error)
+        }
+    }
+
+    /**
+     * Log out of the server by clearing the saved Team ID.
+     */
+    async Logout() {
+        try {
+            this.server.Reset()
+            common.Toast("Logged out")
+            this.Update()
+        }
+        catch (error) {
+            common.Toast(error)
+        }
+    }
+
+    /**
+     * Update the entire page.
+     *
+     * Fetch a new state, and rebuild all dynamic elements on this bage based on
+     * what's returned. If we're in development mode and not logged in, auto
+     * login too.
+     */
+    async Update() {
+        this.state = await this.server.GetState()
+        for (let e of document.querySelectorAll(".messages")) {
+            e.innerHTML = this.state.Messages
+        }
+
+        for (let e of document.querySelectorAll(".login")) {
+            this.renderLogin(e, !this.server.LoggedIn())
+        }
+        for (let e of document.querySelectorAll(".puzzles")) {
+            this.renderPuzzles(e, this.server.LoggedIn())
+        }
+
+        if (this.state.DevelopmentMode() && !this.server.LoggedIn()) {
+            common.Toast("Automatically logging in to devel server")
+            console.info("Logging in with generated Team ID and Team Name", this.fakeRegistration)
+            return this.Login(this.fakeRegistration.TeamId, this.fakeRegistration.TeamName)
+        }
+    }
+
+    /**
+     * Render a login box.
+     * 
+     * This just toggles visibility, there's nothing dynamic in a login box.
+     */
+    renderLogin(element, visible) {
+        element.classList.toggle("hidden", !visible)
+    }
+
+    /**
+     * Render a puzzles box.
+     *
+     * This updates the list of open puzzles, and adds mothball download links
+     * if the server is in development mode.
+     */
+    renderPuzzles(element, visible) {
+        element.classList.toggle("hidden", !visible)
+        while (element.firstChild) element.firstChild.remove()
+        for (let cat of this.state.Categories()) {
+            let pdiv = element.appendChild(document.createElement("div"))
+            pdiv.classList.add("category")
+            
+            let h = pdiv.appendChild(document.createElement("h2"))
+            h.textContent = cat
+            
+            // Extras if we're running a devel server
+            if (this.state.DevelopmentMode()) {
+                let a = h.appendChild(document.createElement('a'))
+                a.classList.add("mothball")
+                a.textContent = "📦"
+                a.href = this.server.URL(`mothballer/${cat}.mb`)
+                a.title = "Download a compiled puzzle for this category"
+            }
+            
+            // List out puzzles in this category
+            let l = pdiv.appendChild(document.createElement("ul"))
+            for (let puzzle of this.state.Puzzles(cat)) {
+                let i = l.appendChild(document.createElement("li"))
+
+                let url = new URL("puzzle.html", window.location)
+                url.hash = `${puzzle.Category}:${puzzle.Points}`
+                let a = i.appendChild(document.createElement("a"))
+                a.textContent = puzzle.Points
+                a.href = url
+                a.target = "_blank"
+            }
+
+            if (!this.state.HasUnsolved(cat)) {
+                l.appendChild(document.createElement("li")).textContent = "✿"
+            }
+            
+            element.appendChild(pdiv)        
+        }
+    }
+}
+
+function init() {
+    window.app = {
+        server: new App()
+    }
+}
+
+if (document.readyState === "loading") {
+    document.addEventListener("DOMContentLoaded", init)
+} else {
+    init()
+}
+  

theme/logout.html

@@ -1,23 +0,0 @@
-<!DOCTYPE html>
-<html>
-  <head>
-    <title>MOTH</title>
-    <meta name="viewport" content="width=device-width">
-    <link rel="stylesheet" href="basic.css">
-    <script>
-sessionStorage.removeItem("id")
-    </script>
-  </head>
-  <body>
-    <h1 id="title">MOTH</h1>
-    <section>
-      <p>Okay, you've been logged out.</p>
-		</section>
-    <nav>
-      <ul>
-        <li><a href="index.html">Sign In</a></li>
-        <li><a href="scoreboard.html">Scoreboard</a></li>
-      </ul>
-    </nav>
-  </body>
-</html>

theme/moth.js

@@ -1,196 +0,0 @@
-// jshint asi:true
-
-var devel = false
-var teamId
-var heartbeatInterval = 40000
-
-function toast(message, timeout=5000) {
-  let p = document.createElement("p")
-  
-  p.innerText = message
-  document.getElementById("messages").appendChild(p)
-  setTimeout(
-    e => { p.remove() },
-    timeout
-  )
-}
-
-function renderNotices(obj) {
-  let ne = document.getElementById("notices")
-  if (ne) {
-    ne.innerHTML = obj
-  }
-}
-
-function renderPuzzles(obj) {
-  let puzzlesElement = document.createElement('div')
-  
-  document.getElementById("login").style.display = "none"
-  
-  // Create a sorted list of category names
-  let cats = Object.keys(obj)
-  cats.sort()
-  if (cats.length == 0) {
-    toast("No categories to serve!")
-  }
-  for (let cat of cats) {
-    if (cat.startsWith("__")) {
-      // Skip metadata
-      continue
-    }
-    let puzzles = obj[cat]
-    
-    let pdiv = document.createElement('div')
-    pdiv.className = 'category'
-    
-    let h = document.createElement('h2')
-    pdiv.appendChild(h)
-    h.textContent = cat
-    
-    // Extras if we're running a devel server
-    if (devel) {
-      let a = document.createElement('a')
-      h.insertBefore(a, h.firstChild)
-      a.textContent = "⬇️"
-      a.href = "mothballer/" + cat + ".mb"
-      a.classList.add("mothball")
-      a.title = "Download a compiled puzzle for this category"
-    }
-    
-    // List out puzzles in this category
-    let l = document.createElement('ul')
-    pdiv.appendChild(l)
-    for (let puzzle of puzzles) {
-      let points = puzzle
-      let id = null
-      
-      if (Array.isArray(puzzle)) {
-        points = puzzle[0]
-        id = puzzle[1]
-      }
-  
-      let i = document.createElement('li')
-      l.appendChild(i)
-      i.textContent = " "
-  
-      if (points === 0) {
-        // Sentry: there are no more puzzles in this category
-        i.textContent = "✿"
-      } else {
-        let a = document.createElement('a')
-        i.appendChild(a)
-        a.textContent = points
-        let url = new URL("puzzle.html", window.location)
-        url.searchParams.set("cat", cat)
-        url.searchParams.set("points", points)
-        if (id) { url.searchParams.set("pid", id) }
-        a.href = url.toString()
-      }
-    }
-    
-    puzzlesElement.appendChild(pdiv)
-  }
-    
-  // Drop that thing in
-  let container = document.getElementById("puzzles")
-  while (container.firstChild) {
-    container.firstChild.remove()
-  }
-  container.appendChild(puzzlesElement)
-}
-
-function renderState(obj) {
-  window.state = obj
-  devel = obj.Config.Devel
-  if (devel) {
-    let params = new URLSearchParams(window.location.search)
-    sessionStorage.id = "1"
-    renderPuzzles(obj.Puzzles)
-  } else if (Object.keys(obj.Puzzles).length > 0) {
-    renderPuzzles(obj.Puzzles)
-  }
-  renderNotices(obj.Messages)
-}
-
-function heartbeat() {
-  let teamId = sessionStorage.id || ""
-  let url = new URL("state", window.location)
-  url.searchParams.set("id", teamId)
-
-  let fd = new FormData()
-  fd.append("id", teamId)
-  fetch(url)
-  .then(resp => {
-    if (resp.ok) {
-      resp.json()
-      .then(renderState)
-      .catch(err => {
-        toast("Error fetching recent state. I'll try again in a moment.")
-        console.log(err)
-      })
-    }
-  })
-  .catch(err => {
-    toast("Error fetching recent state. I'll try again in a moment.")
-    console.log(err)
-  })
-}
-
-function showPuzzles() {
-  let spinner = document.createElement("span")
-  spinner.classList.add("spinner")
-
-  document.getElementById("login").style.display = "none"
-  document.getElementById("puzzles").appendChild(spinner)
-}
-
-function login(e) {
-  e.preventDefault()
-  let name = document.querySelector("[name=name]").value
-  let teamId = document.querySelector("[name=id]").value
-  
-  fetch("register", {
-    method: "POST",
-    body: new FormData(e.target),
-  })
-  .then(resp => {
-    if (resp.ok) {
-      resp.json()
-      .then(obj => {
-        if ((obj.status == "success") || (obj.data.short == "Already registered")) {
-          toast("Logged in")
-          sessionStorage.id = teamId
-          showPuzzles()
-          heartbeat()
-        } else {
-          toast(obj.data.description)
-        }
-      })
-      .catch(err => {
-        toast("Oops, the server has lost its mind. You probably need to tell someone so they can fix it.")
-        console.log(err, resp)
-      })
-    } else {
-      toast("Oops, something's wrong with the server. Try again in a few seconds.")
-      console.log(resp)
-    }
-  })
-  .catch(err => {
-    toast("Oops, something went wrong. Try again in a few seconds.")
-    console.log(err)
-  })
-}
-
-function init() {
-  heartbeat()
-  setInterval(e => heartbeat(), 40000)
-
-  document.getElementById("login").addEventListener("submit", login)
-}
-
-if (document.readyState === "loading") {
-  document.addEventListener("DOMContentLoaded", init)
-} else {
-  init()
-}
-

theme/moth.mjs

@@ -208,6 +208,19 @@ class Puzzle {
         }
         return false
     }
+
+    /**
+     * Submit a proposed answer for points.
+     *
+     * The returned promise will fail if anything goes wrong, including the
+     * proposed answer being rejected.
+     *
+     * @param {String} proposed Answer to submit
+     * @returns {Promise.<String>} Success message
+     */
+    SubmitAnswer(proposed) {
+        return this.server.SubmitAnswer(this.Category, this.Points, proposed)
+    }
 }
 
 /**
@@ -228,23 +241,27 @@ class State {
 
         /** Configuration */
         this.Config = {
-            /** Is the server in debug mode?
+            /** Is the server in development mode?
              * @type {Boolean}
              */
-            Debug: obj.Config.Debug,
+            Devel: obj.Config.Devel,
         }
+
         /** Global messages, in HTML
          * @type {String}
          */
         this.Messages = obj.Messages
+
         /** Map from Team ID to Team Name
          * @type {Object.<String,String>}
          */
         this.TeamNames = obj.TeamNames
+
         /** Map from category name to puzzle point values
          * @type {Object.<String,Number>}
          */
         this.PointsByCategory = obj.Puzzles
+
         /** Log of points awarded
          * @type {Award[]}
          */
@@ -278,6 +295,15 @@ class State {
         return !this.PointsByCategory[category].includes(0)
     }
 
+    /**
+     * Is the server in development mode?
+     * 
+     * @returns {Boolean}
+     */
+    DevelopmentMode() {
+        return this.Config && this.Config.Devel
+    }
+
     /**
      * Return all open puzzles.
      * 
@@ -313,10 +339,16 @@ class State {
  * and will send a Team ID with every request, if it can find one.
  */
 class Server {
+    /**
+     * @param {String | URL} baseUrl Base URL to server, for constructing API URLs
+     */
     constructor(baseUrl) {
+        if (!baseUrl) {
+            throw("Must provide baseURL")
+        }
         this.baseUrl = new URL(baseUrl, location)
-        this.teameIdKey = this.baseUrl.toString() + " teamID"
+        this.teamIdKey = this.baseUrl.toString() + " teamID"
-        this.teamId = localStorage[this.teameIdKey]
+        this.TeamId = localStorage[this.teamIdKey]
     }
 
     /**
@@ -326,22 +358,30 @@ class Server {
      * this function throws an error.
      * 
      * This always sends teamId.
-     * If body is set, POST will be used instead of GET
+     * If args is set, POST will be used instead of GET
      * 
      * @param {String} path Path to API endpoint
-     * @param {Object.<String,String>} body Key/Values to send in POST data
+     * @param {Object.<String,String>} args Key/Values to send in POST data
      * @returns {Promise.<Response>} Response
      */
-    fetch(path, body) {
+    fetch(path, args) {
         let url = new URL(path, this.baseUrl)
-        if (this.teamId & (!(body && body.id))) {
+        if (this.TeamId & (!(args && args.id))) {
-            url.searchParams.set("id", this.teamId)
+            url.searchParams.set("id", this.TeamId)
+        }
+
+        if (args) {
+            let formData = new FormData()
+            for (let k in args) {
+                formData.set(k, args[k])
             }
             return fetch(url, {
-            method: body?"POST":"GET",
+                method: "POST",
-            body,
+                body: formData,
             })
         }
+        return fetch(url)
+    }
 
     /**
      * Send a request to a JSend API endpoint.
@@ -356,7 +396,7 @@ class Server {
         switch (obj.status) {
             case "success":
                 return obj.data
-            case "failure":
+            case "fail":
                 throw new Error(obj.data.description || obj.data.short || obj.data)
             case "error":
                 throw new Error(obj.message)
@@ -365,20 +405,38 @@ class Server {
         }
     }
 
+    /**
+     * Make a new URL for the given resource.
+     * 
+     * @returns {URL}
+     */
+    URL(url) {
+        return new URL(url, this.baseUrl)
+    }
+
+    /**
+     * Are we logged in to the server?
+     * 
+     * @returns {Boolean}
+     */
+    LoggedIn() {
+        return this.TeamId ? true : false
+    }
+
     /**
      * Forget about any previous Team ID.
      * 
      * This is equivalent to logging out.
      */
     Reset() {
-        localStorage.removeItem(this.teameIdKey)
+        localStorage.removeItem(this.teamIdKey)
-        this.teamId = null
+        this.TeamId = null
     }
 
     /**
      * Fetch current contest state.
      * 
-     * @returns {State}
+     * @returns {Promise.<State>}
      */
     async GetState() {
         let resp = await this.fetch("/state")
@@ -387,37 +445,41 @@ class Server {
     }
 
     /**
-     * Register a team name with a team ID.
+     * Log in to a team.
      *
-     * This is similar to, but not exactly the same as, logging in.
+     * This calls the server's registration endpoint; if the call succeds, or
-     * See MOTH documentation for details.
+     * fails with "team already exists", the login is returned as successful. 
      *
      * @param {String} teamId 
      * @param {String} teamName 
      * @returns {Promise.<String>} Success message from server
      */
-    async Register(teamId, teamName) {
+    async Login(teamId, teamName) {
-        let data = await this.call("/login", {id: teamId, name: teamName})
+        let data = await this.call("/register", {id: teamId, name: teamName})
-        this.teamId = teamId
+        this.TeamId = teamId
-        this.teamName = teamName
+        this.TeamName = teamName
-        localStorage[this.teameIdKey] = teamId
+        localStorage[this.teamIdKey] = teamId
         return data.description || data.short
     }
 
     /**
-     * Submit a puzzle answer for points.
+     * Submit a proposed answer for points.
      *
      * The returned promise will fail if anything goes wrong, including the
-     * answer being rejected.
+     * proposed answer being rejected.
      *
      * @param {String} category Category of puzzle
      * @param {Number} points Point value of puzzle
-     * @param {String} answer Answer to submit
+     * @param {String} proposed Answer to submit
-     * @returns {Promise.<Boolean>} Was the answer accepted?
+     * @returns {Promise.<String>} Success message
      */
-    async SubmitAnswer(category, points, answer) {
+    async SubmitAnswer(category, points, proposed) {
-        await this.call("/answer", {category, points, answer})
+        let data = await this.call("/answer", {
-        return true
+            cat: category, 
+            points, 
+            answer: proposed,
+        })
+        return data.description || data.short
     }
 
     /**

theme/puzzle.html

@@ -10,29 +10,25 @@
     <script src="puzzle.mjs" type="module" async></script>
   </head>
   <body>
-    <main>
     <h1 id="title">[loading]</h1>
-      <section>
+    <main>
-        <div id="puzzle">
+      <section id="puzzle">
         <p class="notification">
           Starting script...
         </p>
-        </div>
+      </section>
+      <section class="meta"></section>
         <ul id="files"></ul>
         <p>Puzzle by <span id="authors">[loading]</span></p>
       </section>
       <form class="answer">
-        Team ID: <input type="text" name="id"> <br>
+        <label for="answer">Answer:</label>
-        Answer: <input type="text" name="answer" id="answer"> <span class="answer_ok"></span><br>
+        <input type="text" name="answer" id="answer"> <span class="answer_ok"></span>
+        <br>
         <input type="submit" value="Submit">
       </form>
     </main>
-    <div id="devel" class="notification"></div>
+    <div class="debug" class="notification"></div>
-    <nav>
+    <div class="toasts"></div>
-      <ul>
-        <li><a href="index.html">Puzzles</a></li>
-        <li><a href="scoreboard.html">Scoreboard</a></li>
-      </ul>
-    </nav>
   </body>
 </html>

theme/puzzle.js

@@ -1,225 +0,0 @@
-// jshint asi:true
-
-// prettify adds classes to various types, returning an HTML string.
-function prettify(key, val) {
-  switch (key) {
-    case "Body":
-      return '[HTML]'
-  }
-  return val
-}
-
-// devel_addin drops a bunch of development extensions into element e.
-// It will only modify stuff inside e.
-function devel_addin(e) {
-  let h = e.appendChild(document.createElement("h2"))
-  h.textContent = "Developer Output"
-
-  let log = window.puzzle.Debug.Log || []
-  if (log.length > 0) {
-    e.appendChild(document.createElement("h3")).textContent = "Log"
-    let le = e.appendChild(document.createElement("ul"))
-    for (let entry of log) {
-      le.appendChild(document.createElement("li")).textContent = entry
-    }
-  }
-
-  e.appendChild(document.createElement("h3")).textContent = "Puzzle object"
-  
-  let hobj = JSON.stringify(window.puzzle, prettify, 2)
-  let d = e.appendChild(document.createElement("pre"))
-  d.classList.add("object")
-  d.innerHTML = hobj
-
-  e.appendChild(document.createElement("p")).textContent = "This debugging information will not be available to participants."
-}
-
-// Hash routine used in v3.4 and earlier
-function djb2hash(buf) {
-  let h = 5381
-  for (let c of (new TextEncoder()).encode(buf)) { // Encode as UTF-8 and read in each byte
-    // JavaScript converts everything to a signed 32-bit integer when you do bitwise operations.
-    // So we have to do "unsigned right shift" by zero to get it back to unsigned.
-    h = (((h * 33) + c) & 0xffffffff) >>> 0
-  }
-  return h
-}
-
-// The routine used to hash answers in compiled puzzle packages
-async function sha256Hash(message) {
-  const msgUint8 = new TextEncoder().encode(message);                           // encode as (utf-8) Uint8Array
-  const hashBuffer = await crypto.subtle.digest('SHA-256', msgUint8);           // hash the message
-  const hashArray = Array.from(new Uint8Array(hashBuffer));                     // convert buffer to byte array
-  const hashHex = hashArray.map(b => b.toString(16).padStart(2, '0')).join(''); // convert bytes to hex string
-  return hashHex;
-}
-
-// Is the provided answer possibly correct?
-async function checkAnswer(answer) {
-  let answerHashes = []
-  answerHashes.push(djb2hash(answer))
-  answerHashes.push(await sha256Hash(answer))
-
-  for (let hash of answerHashes) {
-    for (let correctHash of window.puzzle.AnswerHashes) {    
-      if (hash == correctHash) {
-        return true
-      }
-    }
-  }
-  return false
-}
-
-// Pop up a message
-function toast(message, timeout=5000) {
-  let p = document.createElement("p")
-  
-  p.innerText = message
-  document.getElementById("messages").appendChild(p)
-  setTimeout(
-    e => { p.remove() },
-    timeout
-  )
-}
-
-// When the user submits an answer
-function submit(e) {
-  e.preventDefault()
-  let data = new FormData(e.target)
-  
-  window.data = data
-  fetch("answer", {
-    method: "POST",
-    body: data,
-  })
-  .then(resp => {
-    if (resp.ok) {
-      resp.json()
-      .then(obj => {
-        toast(obj.data.description)
-      })
-    } else {
-      toast("Error submitting your answer. Try again in a few seconds.")
-      console.log(resp)
-    }
-  })
-  .catch(err => {
-    toast("Error submitting your answer. Try again in a few seconds.")
-    console.log(err)
-  })
-}
-
-async function loadPuzzle(categoryName, points, puzzleId) {
-  let puzzle = document.getElementById("puzzle")
-  let base = "content/" + categoryName + "/" + puzzleId + "/"
-
-  let resp = await fetch(base + "puzzle.json")
-  if (! resp.ok) {
-    console.log(resp)
-    let err = await resp.text()
-    Array.from(puzzle.childNodes).map(e => e.remove())
-    p = puzzle.appendChild(document.createElement("p"))
-    p.classList.add("Error")
-    p.textContent = err
-    return
-  }
-
-  // Make the whole puzzle available
-  window.puzzle = await resp.json()
-  
-  // Populate authors
-  document.getElementById("authors").textContent = window.puzzle.Authors.join(", ")
-
-  // If answers are provided, this is the devel server
-  if (window.puzzle.Answers.length > 0) {
-    devel_addin(document.getElementById("devel"))
-  }
-  
-  // Load scripts
-  for (let script of (window.puzzle.Scripts || [])) {
-    let st = document.createElement("script")
-    document.head.appendChild(st)
-    st.src = base + script
-  }
-  
-  // List associated files
-  for (let fn of (window.puzzle.Attachments || [])) {
-    let li = document.createElement("li")
-    let a = document.createElement("a")
-    a.href = base + fn
-    a.innerText = fn
-    li.appendChild(a)
-    document.getElementById("files").appendChild(li)
-  }
-
-  // Prefix `base` to relative URLs in the puzzle body
-  let doc = new DOMParser().parseFromString(window.puzzle.Body, "text/html")
-  for (let se of doc.querySelectorAll("[src],[href]")) {
-    se.outerHTML = se.outerHTML.replace(/(src|href)="([^/]+)"/i, "$1=\"" + base + "$2\"")
-  }
-  
-  // If a validation pattern was provided, set that
-  if (window.puzzle.AnswerPattern) {
-    document.querySelector("#answer").pattern = window.puzzle.AnswerPattern
-  }
-
-  // Replace puzzle children with what's in `doc`
-  Array.from(puzzle.childNodes).map(e => e.remove())
-  Array.from(doc.body.childNodes).map(e => puzzle.appendChild(e))
-  
-  document.title = categoryName + " " + points
-  document.querySelector("body > h1").innerText = document.title
-  document.querySelector("input[name=cat]").value = categoryName
-  document.querySelector("input[name=points]").value = points
-}
-
-// Check to see if the answer might be correct
-// This might be better done with the "constraint validation API"
-// https://developer.mozilla.org/en-US/docs/Learn/HTML/Forms/Form_validation#Validating_forms_using_JavaScript
-function answerCheck(e) {
-  let answer = e.target.value
-  let ok = document.querySelector("#answer_ok")
-  
-  // You have to provide someplace to put the check
-  if (! ok) {
-    return
-  }
-  
-  checkAnswer(answer)
-  .then (correct => {
-    if (correct) {
-      ok.textContent = "⭕"
-      ok.title = "Possibly correct"
-    } else {
-      ok.textContent = "❌"
-      ok.title = "Definitely not correct"
-    }
-  })
-}
-
-function init() {
-  let params = new URLSearchParams(window.location.search)
-  let categoryName = params.get("cat")
-  let points = params.get("points")
-  let puzzleId = params.get("pid")
-  
-  if (categoryName && points) {
-    loadPuzzle(categoryName, points, puzzleId || points)
-  }
-
-  let teamId = sessionStorage.getItem("id")
-  if (teamId) {
-    document.querySelector("input[name=id]").value = teamId
-  }
-  
-  if (document.querySelector("#answer")) {
-    document.querySelector("#answer").addEventListener("input", answerCheck)
-  }
-  document.querySelector("form").addEventListener("submit", submit)
-}
-
-if (document.readyState === "loading") {
-  document.addEventListener("DOMContentLoaded", init)
-} else {
-  init()
-}

theme/puzzle.mjs

@@ -1,4 +1,10 @@
+/**
+ * Functionality for puzzle.html (Puzzle display / answer form)
+ */
 import * as moth from "./moth.mjs"
+import * as common from "./common.mjs"
+
+const server = new moth.Server(".")
 
 /**
  * Handle a submit event on a form.
@@ -10,9 +16,22 @@ import * as moth from "./moth.mjs"
  * 
  * @param {Event} event 
  */
-function formSubmitHandler(event) {
+async function formSubmitHandler(event) {
     event.preventDefault()
-    console.log(event)
+    let data = new FormData(event.target)
+    let proposed = data.get("answer")
+    let message
+    
+    console.group("Submit answer")
+    console.info(`Proposed answer: ${proposed}`)
+    try {
+        message = await window.app.puzzle.SubmitAnswer(proposed)
+    }
+    catch (err) {
+        common.Toast(err)
+    }
+    common.Toast(message)
+    console.groupEnd("Submit answer")
 }
 
 /**
@@ -69,12 +88,40 @@ function error(error) {
  * 
  * @param {String} s 
  */
-function setanswer(s) {
+function SetAnswer(s) {
     let e = document.querySelector("#answer")
     e.value = s
     e.dispatchEvent(new Event("input"))
 }
 
+function writeObject(e, obj) {
+    let keys = Object.keys(obj)
+    keys.sort()
+    for (let key of keys) {
+        let val = obj[key]
+        if ((key === "Body") || (!val) || (val.length === 0)) {
+            continue
+        }
+
+        let d = e.appendChild(document.createElement("dt"))
+        d.textContent = key
+
+        let t = e.appendChild(document.createElement("dd"))
+        if (Array.isArray(val)) {
+            let vi = t.appendChild(document.createElement("ul"))
+            vi.multiple = true
+            for (let a of val) {
+                let opt = vi.appendChild(document.createElement("li"))
+                opt.textContent = a
+            }
+        } else if (typeof(val) === "object") {
+            writeObject(t, val)
+        } else {
+            t.textContent = val
+        }
+    }
+}
+
 /**
  * Load the given puzzle.
  * 
@@ -93,16 +140,17 @@ async function loadPuzzle(category, points) {
         }
     }    
 
-    let server = new moth.Server()
     let puzzle = server.GetPuzzle(category, points)
     console.time("Populate")
     await puzzle.Populate()
     console.timeEnd("Populate")
 
+    console.info("Tweaking HTML...")
     let title = `${category} ${points}`
     document.querySelector("title").textContent = title
     document.querySelector("#title").textContent = title
     document.querySelector("#authors").textContent = puzzle.Authors.join(", ")
+    document.querySelector("#answer").pattern = window.puzzle.AnswerPattern
     puzzleElement().innerHTML = puzzle.Body
 
     console.info("Adding attached scripts...")
@@ -122,6 +170,16 @@ async function loadPuzzle(category, points) {
         document.getElementById("files").appendChild(li)
     }
 
+
+    console.info("Filling debug information...")
+    for (let e of document.querySelectorAll(".debug")) {
+        if (puzzle.Answers.length > 0) {
+            writeObject(e, puzzle)
+        } else {
+            e.classList.add("hidden")
+        }
+    }
+
     let baseElement = document.head.appendChild(document.createElement("base"))
     baseElement.href = contentBase
 
@@ -129,11 +187,13 @@ async function loadPuzzle(category, points) {
     console.info("window.app.puzzle =", window.app.puzzle)
 
     console.groupEnd()
+
+    return puzzle
 }
 
-function init() {
+async function init() {
     window.app = {}
-    window.setanswer = setanswer
+    window.setanswer = (str => SetAnswer(str))
 
     for (let form of document.querySelectorAll("form.answer")) {
         form.addEventListener("submit", formSubmitHandler)
@@ -158,12 +218,7 @@ function init() {
         return
     }
 
-    loadPuzzle(category, points)
+    window.app.puzzle = await loadPuzzle(category, points)
-    .catch(err => error(err))
 }
 
-if (document.readyState === "loading") {
+common.WhenDOMLoaded(init)
-    document.addEventListener("DOMContentLoaded", init)
-} else {
-    init()
-}

theme/scoreboard.css

@@ -0,0 +1,91 @@
+/* GHC displays: 1024x1820 */
+@media screen and (max-aspect-ratio: 4/5) and (min-height: 1600px) {
+  html {
+    font-size: 20pt;
+  }
+}
+
+#chart {
+    background-color: rgba(0, 0, 0, 0.8);
+}
+.logo {
+  text-align: center;
+  background-color: rgba(255, 255, 255, 0.2);
+  font-family: Montserrat, sans-serif;
+  font-weight: 500;
+  border-radius: 10px;
+  font-size: 1.2em;
+}
+.cyber {
+  color: black;
+}
+.fire {
+  color: #d94a1f;
+}
+.announcement.floating {
+  position: fixed;
+  bottom: 0;
+  width: 100hw;
+  max-width: inherit;
+}
+.announcement {
+  background-color: rgba(255,255,255,0.5);
+  color: black;
+  padding: 0.25em;
+  border-radius: 5px;
+  max-width: 20em;
+  text-align: center;
+  display: flex;
+  align-items: flex-end;
+  justify-content: space-around;
+  font-size: 1.3em;
+  flex-wrap: wrap;
+}
+.announcement div {
+  margin: 1em;  
+  max-width: 45vw;
+  text-align: center;
+  
+}
+.qrcode {
+  width: 30vw;
+}
+.examples {
+  display: flex;
+  flex-wrap: wrap;
+  justify-content: space-between;
+}
+.examples > div {
+  margin: 0.5em;
+  max-width: 40%;
+}
+
+#rankings {
+	width: 100%;
+    position: relative;
+    background-color: rgba(0, 0, 0, 0.8);
+}
+
+#rankings span {
+	font-size: 75%;
+	display: inline-block;
+	overflow: hidden;
+	height: 1.7em;
+}
+#rankings span.teamname {
+	font-size: inherit;
+	color: white;
+	text-shadow: 0 0 3px black;
+	opacity: 0.8;
+	position: absolute;
+	right: 0.2em;
+}
+#rankings div * {white-space: nowrap;}
+.cat0, .cat8, .cat16 {background-color: #a6cee3; color: black;}
+.cat1, .cat9, .cat17 {background-color: #1f78b4; color: white;}
+.cat2, .cat10, .cat18 {background-color: #b2df8a; color: black;}
+.cat3, .cat11, .cat19 {background-color: #33a02c; color: white;}
+.cat4, .cat12, .cat20 {background-color: #fb9a99; color: black;}
+.cat5, .cat13, .cat21 {background-color: #e31a1c; color: white;}
+.cat6, .cat14, .cat22 {background-color: #fdbf6f; color: black;}
+.cat7, .cat15, .cat23 {background-color: #ff7f00; color: black;}

theme/scoreboard.html

@@ -3,22 +3,17 @@
   <head>
     <title>Scoreboard</title>
     <link rel="stylesheet" href="basic.css">
+    <link rel="stylesheet" href="scoreboard.css">
     <meta name="viewport" content="width=device-width">
-    <script src="moment.min.js" async></script>
+    <script src="https://cdn.jsdelivr.net/npm/luxon@1.26.0"></script>
-    <script src="https://cdn.jsdelivr.net/npm/chart.js@2.9.4/dist/Chart.min.js" async></script>
+    <script src="https://cdn.jsdelivr.net/npm/chart.js@3.0.2"></script>
-    <script src="scoreboard.js" async></script>
+    <script src="https://cdn.jsdelivr.net/npm/chartjs-adapter-luxon@0.2.1"></script>
+    <script type="module" src="scoreboard.mjs"></script>
   </head>
   <body class="wide">
-    <h4 id="location"></h4>
     <section class="rotate">
-      <div id="chart"></div>
+      <div id="chart"><canvas></canvas></div>
       <div id="rankings"></div>
     </section>
-    <nav>
-      <ul>
-        <li><a href="index.html">Puzzles</a></li>
-        <li><a href="scoreboard.html">Scoreboard</a></li>
-      </ul>
-    </nav>
   </body>
 </html>

theme/scoreboard.mjs

@@ -1,8 +1,19 @@
 // jshint asi:true
 
-function scoreboardInit() {
+// import { Chart, registerables } from "https://cdn.jsdelivr.net/npm/chart.js@3.0.2"
+// import {DateTime} from "https://cdn.jsdelivr.net/npm/luxon@1.26.0"
+// import "https://cdn.jsdelivr.net/npm/chartjs-adapter-luxon@0.1.1"
+// Chart.register(...registerables)
 
-  chartColors = [
+const MILLISECOND = 1
+const SECOND = 1000 * MILLISECOND
+const MINUTE = 60 * SECOND
+
+// If all else fails...
+setInterval(() => location.reload(), 30 * SECOND)
+
+function scoreboardInit() {
+  let chartColors = [
     "rgb(255, 99, 132)",
     "rgb(255, 159, 64)",
     "rgb(255, 205, 86)",
@@ -12,12 +23,70 @@ function scoreboardInit() {
     "rgb(201, 203, 207)"
   ]
 
-  function update(state) {
+  for (let q of document.querySelectorAll("[data-url]")) {
-    window.state = state
+    let url = new URL(q.dataset.url, document.location)
+    q.textContent = url.hostname
+    if (url.port) {
+      q.textContent += `:${url.port}`
+    }
+    if (url.pathname != "/") {
+      q.textContent += url.pathname
+    }
+  }
+  for (let q of document.querySelectorAll(".qrcode")) {
+    let url = new URL(q.dataset.url, document.location)
+    let qr = new QRious({
+      element: q,
+      value: url.toString(),
+    })
+  }
+
+  let chart
+  let canvas = document.querySelector("#chart canvas")
+  if (canvas) {
+    chart = new Chart(canvas.getContext("2d"), {
+      type: "line",
+      options: {
+        responsive: true,
+        scales: {
+          x: {
+            type: "time",
+            time: {
+              // XXX: the manual says this should do something, it does something in the samples, IDK
+              tooltipFormat: "HH:mm"
+            },
+            title: {
+              display: true,
+              text: "Time"
+            }
+          },
+          y: {
+            title: {
+              display: true,
+              text: "Points"
+            }
+          }
+        },
+        tooltips: {
+          mode: "index",
+          intersect: false
+        },
+        hover: {
+          mode: "nearest",
+          intersect: true
+        }
+      }
+    })
+  }
+
+  async function refresh() {
+    let resp = await fetch("../state")
+    let state = await resp.json()
 
     for (let rotate of document.querySelectorAll(".rotate")) {
       rotate.appendChild(rotate.firstElementChild)
     }
+    window.scrollTo(0,0)
     
     let element = document.getElementById("rankings")
     let teamNames = state.TeamNames
@@ -28,12 +97,12 @@ function scoreboardInit() {
     //
     // We have been doing some variation on this "everybody backs up the server state" trick since 2009.
     // We have needed it 0 times.
-    let stateHistory = JSON.parse(localStorage.getItem("stateHistory")) || []
+    let pointsHistory = JSON.parse(localStorage.getItem("pointsHistory")) || []
-    if (stateHistory.length >= 20) {
+    if (pointsHistory.length >= 20) {
-      stateHistory.shift()
+      pointsHistory.shift()
     }
-    stateHistory.push(state)
+    pointsHistory.push(pointsLog)
-    localStorage.setItem("stateHistory", JSON.stringify(stateHistory))
+    localStorage.setItem("pointsHistory", JSON.stringify(pointsHistory))
   
     let teams = {}
     let highestCategoryScore = {} // map[string]int
@@ -89,7 +158,7 @@ function scoreboardInit() {
         overall += team.categoryScore[cat] / highestCategoryScore[cat]
       }
   
-      team.historyLine.push({t: new Date(timestamp  * 1000), y: overall})
+      team.historyLine.push({x: timestamp * 1000, y: overall})
     }
   
     // Compute overall scores based on current highest
@@ -150,14 +219,21 @@ function scoreboardInit() {
       element.appendChild(row)
     }
     
-    let datasets = []
+    if (!chart) {
+      return
+    }
+
+    /*
+     * Update chart
+     */
+    chart.data.datasets = []
     for (let i in winners) {
       if (i > 5) {
         break
       }
       let team = winners[i]
       let color = chartColors[i % chartColors.length]
-      datasets.push({
+      chart.data.datasets.push({
         label: team.name,
         backgroundColor: color,
         borderColor: color,
@@ -166,68 +242,8 @@ function scoreboardInit() {
         fill: false
       })
     }
-    let config = {
+    chart.update()
-      type: "line",
+    window.chart = chart
-      data: {
-        datasets: datasets
-      },
-      options: {
-        responsive: true,
-        scales: {
-          xAxes: [{
-            display: true,
-            type: "time",
-            time: {
-              tooltipFormat: "ll HH:mm"
-            },
-            scaleLabel: {
-              display: true,
-              labelString: "Time"
-            }
-          }],
-          yAxes: [{
-            display: true,
-            scaleLabel: {
-              display: true,
-              labelString: "Points"
-            }
-          }]
-        },
-        tooltips: {
-          mode: "index",
-          intersect: false
-        },
-        hover: {
-          mode: "nearest",
-          intersect: true
-        }
-      }
-    }
-    
-    let chart = document.querySelector("#chart")
-    if (chart) {
-      let canvas = chart.querySelector("canvas")
-      if (! canvas) {
-        canvas = document.createElement("canvas")
-        chart.appendChild(canvas)
-      }
-      
-      let myline = new Chart(canvas.getContext("2d"), config)
-      myline.update()
-    }
-  }
-  
-  function refresh() {
-    fetch("state")
-    .then(resp => {
-      return resp.json()
-    })
-    .then(obj => {
-      update(obj)
-    })
-    .catch(err => {
-      console.log(err)
-    })
   }
   
   function init() {
@@ -237,7 +253,7 @@ function scoreboardInit() {
       location.textContent = base
     }
   
-    setInterval(refresh, 60000)
+    setInterval(refresh, 20 * SECOND)
     refresh()
   }
   

theme/token.html

@@ -1,45 +1,29 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
   <head>
     <title>Redeem Token</title>
     <link rel="stylesheet" href="basic.css">
     <meta name="viewport" content="width=device-width">
-    <script src="puzzle.js"></script>
+    <script src="token.mjs" type="module" async></script>
-    <script>
-function tokenInput(e) {
-  let vals = e.target.value.split(":")
-  document.querySelector("input[name=cat]").value = vals[0]
-  document.querySelector("input[name=points]").value = vals[1]
-  document.querySelector("input[name=answer]").value = vals[2]
-}
-
-function tokenInit() {
-  document.querySelector("input[name=token]").addEventListener("input", tokenInput)
-}
-
-if (document.readyState === "loading") {
-  document.addEventListener("DOMContentLoaded", tokenInit)
-} else {
-  tokenInit()
-}
-    </script>
   </head>
   <body>
     <h1>Redeem Token</h1>
-    <div id="messages"></div>
+    <main>
-    <form id="tokenForm">
+      <p>
-      <input type="hidden" name="cat">
+        Have you found a token?
-      <input type="hidden" name="points">
+      </p>
-      <input type="hidden" name="answer">
+      <p></p>
-      Team ID: <input type="text" name="id"> <br>
+        Tokens look like
-      Token: <input type="text" name="token"> <br>
+        <code>category:5:xylep-radar-nanox</code>
+      <p>
+        Tokens may be redeemed here for points in their category.
+        Tokens can appear anywhere: online, on slips of paper, projected onto screens…
+      </p>
+    </main>
+    <form class="token"</form>
+      <label for="token">Token:</label> <input type="text" name="token" id="token"> <br>
       <input type="submit" value="Submit">
     </form>
-    <nav>
+    <div class="toasts"></div>
-      <ul>
-        <li><a href="puzzle-list.html">Puzzles</a></li>
-        <li><a href="scoreboard.html">Scoreboard</a></li>
-      </ul>
-    </nav>
   </body>
 </html>

theme/token.mjs

@@ -0,0 +1,48 @@
+/**
+ * Functionality for token.html
+ */
+import * as moth from "./moth.mjs"
+import * as common from "./common.mjs"
+
+const server = new moth.Server(".")
+
+/**
+ * Handle a submit event on a form.
+ * 
+ * @param {SubmitEvent} event 
+ */
+async function formSubmitHandler(event) {
+    event.preventDefault()
+
+    let formData = new FormData(event.target)
+    let token = formData.get("token")
+    let vals = token.split(":")
+    let category = vals[0]
+    let points = Number(vals[1])
+    let proposed = vals[2]
+    if (!category || !points || !proposed) {
+        console.info("Not a token:", vals)
+        common.Toast("This is not a properly-formed token")
+        return
+    }
+    try {
+        let message = await server.SubmitAnswer(category, points, proposed)
+        common.Toast(message)
+    }
+    catch (error) {
+        if (error.message == "incorrect answer") {
+            common.Toast("Unknown token")
+        } else {
+            console.error(error)
+            common.Toast(error)
+        }
+    }
+}
+
+function init() {
+    for (let form of document.querySelectorAll("form.token")) {
+        form.addEventListener("submit", formSubmitHandler)
+    }
+}
+
+common.WhenDOMLoaded(init)