Don't include pow and hasher scripts to both document and worker. Import

hasher script only once for all tabs, not on every posting

boards/static/js/form.js

@@ -86,7 +86,7 b' function selectFileChoice() {'
 $(document).ready(function() {
     var powDifficulty = parseInt($('body').attr('data-pow-difficulty'));
     if (powDifficulty > 0 && typeof SharedWorker != 'undefined') {
-        var worker = new SharedWorker($('#powScript').attr('src'));
+        var worker = new SharedWorker($('.post-form').attr('data-pow-script'));
         worker.port.onmessage = function(e) {
             var form = $('#form');
             addHiddenInput(form, 'timestamp', e.data.timestamp);
@@ -112,7 +112,7 b' function selectFileChoice() {'
             var data = {
                 msg: msg,
                 difficulty: parseInt($('body').attr('data-pow-difficulty')),
-                hasher: $('#sha256Script').attr('src')
+                hasher: $('.post-form').attr('data-hasher')
             };
             worker.port.postMessage(data);
 

boards/static/js/proof_of_work.js

@@ -1,10 +1,10 b''
 var POW_COMPUTING_TIMEOUT = 2;
 var POW_HASH_LENGTH = 16;
 
-var hasher;
+var hasher = null;
 
 
-function computeHash(iteration, guess, target, payload, timestamp, hasher, port) {
+function computeHash(iteration, guess, target, payload, timestamp, port) {
     iteration += 1;
     var hash = hasher(payload + iteration).toString();
     guess = hash.substring(0, POW_HASH_LENGTH);
@@ -26,12 +26,12 b' function computeHash(iteration, guess, t'
         //console.log("Target: ", target);
 
         setTimeout(function() {
-            computeHash(iteration, guess, target, payload, timestamp, hasher, port);
+            computeHash(iteration, guess, target, payload, timestamp, port);
         }, POW_COMPUTING_TIMEOUT);
     }
 }
 
-function doWork(message, hasher, difficulty, port) {
+function doWork(message, difficulty, port) {
     var timestamp = Date.now();
     var iteration = 0;
     var payload = timestamp + message;
@@ -44,7 +44,7 b' function doWork(message, hasher, difficu'
     var guess = target + '0';
 
     setTimeout(function() {
-        computeHash(iteration, guess, target, payload, timestamp, hasher, port);
+        computeHash(iteration, guess, target, payload, timestamp, port);
     }, POW_COMPUTING_TIMEOUT);
 }
 
@@ -54,10 +54,13 b' onconnect = function(e) {'
 
     port.onmessage = function(e) {
         var difficulty = e.data.difficulty;
-        importScripts(e.data.hasher);
-        var hasher = CryptoJS.SHA256;
 
-        self.doWork(e.data.msg, hasher, difficulty, port);
+        if (hasher == null) {
+            importScripts(e.data.hasher);
+            hasher = CryptoJS.SHA256;
+        }
+
+        self.doWork(e.data.msg, difficulty, port);
     };
 }
 

boards/templates/boards/all_threads.html

@@ -155,7 +155,8 b''
 
     <div class="post-form-w">
         <script src="{% static 'js/panel.js' %}"></script>
-        <div class="post-form">
+        <div class="post-form" data-hasher="{% static 'js/3party/sha256.js' %}"
+                               data-pow-script="{% static 'js/proof_of_work.js' %}">
             <div class="form-title">{% trans "Create new thread" %}</div>
             <div class="swappable-form-full">
             <form enctype="multipart/form-data" method="post" id="form">{% csrf_token %}
@@ -180,8 +181,6 b''
     </div>
 
     <script src="{% static 'js/form.js' %}"></script>
-    <script id="sha256Script" src="{% static 'js/3party/sha256.js' %}"></script>
-    <script id="powScript" src="{% static 'js/proof_of_work.js' %}"></script>
         <script src="{% static 'js/3party/jquery.blockUI.js' %}"></script>
     <script src="{% static 'js/thread_create.js' %}"></script>
 

boards/templates/boards/thread_normal.html

@@ -43,7 +43,8 b''
         <div class="post-form-w">
             <script src="{% static 'js/panel.js' %}"></script>
             <div class="form-title">{% trans "Reply to thread" %} #{{ opening_post.id }}<span class="reply-to-message"> {% trans "to message " %} #<span id="reply-to-message-id"></span></span></div>
-            <div class="post-form" id="compact-form">
+            <div class="post-form" id="compact-form" data-hasher="{% static 'js/3party/sha256.js' %}"
+                       data-pow-script="{% static 'js/proof_of_work.js' %}">
                 <div class="swappable-form-full">
                     <form enctype="multipart/form-data" method="post" id="form">{% csrf_token %}
                         <div class="compact-form-text"></div>
@@ -69,8 +70,6 b''
 
         <script src="{% static 'js/form.js' %}"></script>
         <script src="{% static 'js/jquery.form.min.js' %}"></script>
-        <script id="sha256Script" src="{% static 'js/3party/sha256.js' %}"></script>
-        <script id="powScript" src="{% static 'js/proof_of_work.js' %}"></script>
         <script src="{% static 'js/3party/jquery.blockUI.js' %}"></script>
         <script src="{% static 'js/thread.js' %}"></script>
         <script src="{% static 'js/thread_update.js' %}"></script>