work on updated client API

src/handlers.go

@@ -12,39 +12,26 @@ import (
 	"strings"
 )
 
+// https://github.com/omniti-labs/jsend
 type JSend struct {
 	Status string    `json:"status"`
-	Data   JSendData `json:"data"`
+	Data   struct {
+		Short       string `json:"short"`
+		Description string `json:"description"`
+	}  `json:"data"`
 }
-type JSendData struct {
-	Short       string `json:"short"`
-	Description string `json:"description"`
-}
-
-type Status int
 
 const (
-	Success = iota
-	Fail
-	Error
+	JSendSuccess = "success"
+	JSendFail = "fail"
+	JSendError = "error"
 )
 
-func respond(w http.ResponseWriter, req *http.Request, status Status, short string, format string, a ...interface{}) {
-	resp := JSend{
-		Status: "success",
-		Data: JSendData{
-			Short:       short,
-			Description: fmt.Sprintf(format, a...),
-		},
-	}
-	switch status {
-	case Success:
-		resp.Status = "success"
-	case Fail:
-		resp.Status = "fail"
-	default:
-		resp.Status = "error"
-	}
+func respond(w http.ResponseWriter, req *http.Request, status string, short string, format string, a ...interface{}) {
+	resp := JSend{}
+	resp.Status = status
+	resp.Data.Short = short
+	resp.Data.Description = fmt.Sprintf(format, a...)
 
 	respBytes, err := json.Marshal(resp)
 	if err != nil {
@@ -82,7 +69,7 @@ func (ctx *Instance) registerHandler(w http.ResponseWriter, req *http.Request) {
 
 	if (teamid == "") || (teamname == "") {
 		respond(
-			w, req, Fail,
+			w, req, JSendFail,
 			"Invalid Entry",
 			"Either `id` or `name` was missing from this request.",
 		)
@@ -92,7 +79,7 @@ func (ctx *Instance) registerHandler(w http.ResponseWriter, req *http.Request) {
 	teamids, err := os.Open(ctx.StatePath("teamids.txt"))
 	if err != nil {
 		respond(
-			w, req, Fail,
+			w, req, JSendFail,
 			"Cannot read valid team IDs",
 			"An error was encountered trying to read valid teams IDs: %v", err,
 		)
@@ -101,7 +88,7 @@ func (ctx *Instance) registerHandler(w http.ResponseWriter, req *http.Request) {
 	defer teamids.Close()
 	if !hasLine(teamids, teamid) {
 		respond(
-			w, req, Fail,
+			w, req, JSendFail,
 			"Invalid Team ID",
 			"I don't have a record of that team ID. Maybe you used capital letters accidentally?",
 		)
@@ -109,10 +96,17 @@ func (ctx *Instance) registerHandler(w http.ResponseWriter, req *http.Request) {
 	}
 
 	f, err := os.OpenFile(ctx.StatePath("teams", teamid), os.O_CREATE|os.O_EXCL|os.O_WRONLY, 0644)
-	if err != nil {
+	if os.IsExist(err) {
+		respond(
+			w, req, JSendFail,
+			"Already registered",
+			"This team ID has already been registered.",
+		)
+		return
+	} else if err != nil {
 		log.Print(err)
 		respond(
-			w, req, Fail,
+			w, req, JSendFail,
 			"Registration failed",
 			"Unable to register. Perhaps a teammate has already registered?",
 		)
@@ -121,7 +115,7 @@ func (ctx *Instance) registerHandler(w http.ResponseWriter, req *http.Request) {
 	defer f.Close()
 	fmt.Fprintln(f, teamname)
 	respond(
-		w, req, Success,
+		w, req, JSendSuccess,
 		"Team registered",
 		"Okay, your team has been named and you may begin using your team ID!",
 	)
@@ -136,7 +130,7 @@ func (ctx *Instance) answerHandler(w http.ResponseWriter, req *http.Request) {
 	points, err := strconv.Atoi(pointstr)
 	if err != nil {
 		respond(
-			w, req, Fail,
+			w, req, JSendFail,
 			"Cannot parse point value",
 			"This doesn't look like an integer: %s", pointstr,
 		)
@@ -146,7 +140,7 @@ func (ctx *Instance) answerHandler(w http.ResponseWriter, req *http.Request) {
 	haystack, err := ctx.OpenCategoryFile(category, "answers.txt")
 	if err != nil {
 		respond(
-			w, req, Fail,
+			w, req, JSendFail,
 			"Cannot list answers",
 			"Unable to read the list of answers for this category.",
 		)
@@ -158,7 +152,7 @@ func (ctx *Instance) answerHandler(w http.ResponseWriter, req *http.Request) {
 	needle := fmt.Sprintf("%d %s", points, answer)
 	if !hasLine(haystack, needle) {
 		respond(
-			w, req, Fail,
+			w, req, JSendFail,
 			"Wrong answer",
 			"That is not the correct answer for %s %d.", category, points,
 		)
@@ -167,14 +161,14 @@ func (ctx *Instance) answerHandler(w http.ResponseWriter, req *http.Request) {
 
 	if err := ctx.AwardPoints(teamid, category, points); err != nil {
 		respond(
-			w, req, Error,
+			w, req, JSendError,
 			"Cannot award points",
 			"The answer is correct, but there was an error awarding points: %v", err.Error(),
 		)
 		return
 	}
 	respond(
-		w, req, Success,
+		w, req, JSendSuccess,
 		"Points awarded",
 		fmt.Sprintf("%d points for %s!", points, teamid),
 	)

theme/basic.css

@@ -12,7 +12,7 @@ h1 {
 	background: #5e576b;
 	color: #9e98a8;
 }
-.Fail, .Error {
+.Fail, .Error, #messages {
 	background: #3a3119;
 	color: #ffcc98;
 }
@@ -50,6 +50,10 @@ iframe#body {
 img {
   max-width: 100%;
 }
+#messages {
+  min-height: 3em;
+  border: solid black 2px;
+}
 #scoreboard {
 	width: 100%;
 	position: relative;
@@ -87,3 +91,25 @@ img {
 .kvpair {
   border: solid black 2px;
 }
+
+.spinner {
+  display: inline-block;
+  width: 64px;
+  height: 64px;
+  display: block;
+  width: 46px;
+  height: 46px;
+  margin: 1px;
+  border-radius: 50%;
+  border: 5px solid #fff;
+  border-color: #fff transparent #fff transparent;
+  animation: rotate 1.2s linear infinite;
+}
+@keyframes rotate {
+  0% {
+    transform: rotate(0deg);
+  }
+  100% {
+    transform: rotate(360deg);
+  }
+}

theme/index.html

@@ -1,14 +1,16 @@
 <!DOCTYPE html>
 <html>
   <head>
-    <title>Sign In</title>
+    <title>MOTH</title>
     <meta name="viewport" content="width=device-width">
     <link rel="stylesheet" href="basic.css">
     <script src="moth.js"></script>
   </head>
   <body>
-    <h1 id="title">Sign In</h1>
+    <h1 id="title">MOTH</h1>
     <section>
+      <div id="messages"></div>
+
       <div id="login">
         Team name: <input name="name">
         Team ID: <input name="id"> <br>