From fbd247880d7fa0d04aecb61c8960876a3c7a6033 Mon Sep 17 00:00:00 2001
From: Carl Worth <cworth@cworth.org>
Date: Sun, 14 Jun 2020 15:14:44 -0700
Subject: [PATCH 1/1] Fix to use server-sent state for whether player has
 answered/judged

Previously we were using a component state Boolean "submitted" for
this information, but that's fundamentally broken since if the client
reloads the page that state is lost, resulting in the user being
presented with the form as to submit a second time (which is not
allowed by the game).

So, now the rendering looks to see whether the current player's name
is in the list of submitted players, and if so, it does not display
the form. This is exactly what we want.
---
 empathy/empathy.jsx | 31 +++++++++++++++++++------------
 1 file changed, 19 insertions(+), 12 deletions(-)

diff --git a/empathy/empathy.jsx b/empathy/empathy.jsx
index 566ad10..8006942 100644
--- a/empathy/empathy.jsx
+++ b/empathy/empathy.jsx
@@ -402,14 +402,19 @@ class Ambiguities extends React.PureComponent {
 
     this.state = {
       word_sets: word_sets,
-      submitted: false,
       selected: null
     };
 
+    this.submitted = false;
     this.judging_sent_recently = false;
   }
 
   async handle_submit() {
+
+    /* Don't submit a second time. */
+    if (this.submitted)
+      return;
+
     const response = await fetch_post_json(
       `judged/${this.props.prompt.id}`,{
         word_groups: this.state.word_sets.map(set => Array.from(set))
@@ -427,9 +432,7 @@ class Ambiguities extends React.PureComponent {
       return;
     }
 
-    this.setState({
-      submitted: true
-    });
+    this.submitted = true;
   }
 
   handle_click(word) {
@@ -498,7 +501,7 @@ class Ambiguities extends React.PureComponent {
   }
 
   render() {
-    if (this.state.submitted)
+    if (this.props.players_judged.has(this.props.player.name)) {
       return (
         <div className="please-wait">
           <h2>Submission received</h2>
@@ -543,6 +546,7 @@ class Ambiguities extends React.PureComponent {
 
         </div>
       );
+    }
 
     const btn_class = "ambiguity-button";
     const btn_selected_class = btn_class + " selected";
@@ -596,9 +600,7 @@ class ActivePrompt extends React.PureComponent {
     super(props);
     const items = props.prompt.items;
 
-    this.state = {
-      submitted: false
-    };
+    this.submitted = false;
 
     this.answers = [...Array(items)].map(() => React.createRef());
     this.answering_sent_recently = false;
@@ -630,6 +632,10 @@ class ActivePrompt extends React.PureComponent {
     /* Prevent the default page-changing form-submission behavior. */
     event.preventDefault();
 
+    /* And don't submit a second time. */
+    if (this.submitted)
+      return;
+
     const response = await fetch_post_json(`answer/${this.props.prompt.id}`, {
       answers: this.answers.map(r => r.current.value)
     });
@@ -646,13 +652,11 @@ class ActivePrompt extends React.PureComponent {
 
     /* Everything worked. Server is happy with our answers. */
     form.reset();
-    this.setState({
-        submitted: true
-    });
+    this.submitted = true;
   }
 
   render() {
-    if (this.state.submitted)
+    if (this.props.players_answered.has(this.props.player.name)) {
       return (
         <div className="please-wait">
           <h2>Submission received</h2>
@@ -697,6 +701,7 @@ class ActivePrompt extends React.PureComponent {
 
         </div>
       );
+    }
 
     return (
       <div className="active-prompt">
@@ -983,6 +988,7 @@ class Game extends React.PureComponent {
       return <Ambiguities
                prompt={state.active_prompt}
                words={state.ambiguities}
+               player={state.player_info}
                players_judged={state.players_judged}
                players_judging={state.players_judging}
                votes={state.end_judging_votes}
@@ -992,6 +998,7 @@ class Game extends React.PureComponent {
     if (state.active_prompt) {
       return <ActivePrompt
                prompt={state.active_prompt}
+               player={state.player_info}
                players_answered={state.players_answered}
                players_answering={state.players_answering}
                votes={state.end_answers_votes}
-- 
2.43.0