425 lines
12 KiB
JavaScript
425 lines
12 KiB
JavaScript
var dialogOpen = false;
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function showDialogWithText(titleTxt, bodyTxt) {
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var modalDialog = $('#modalDialog');
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var title = modalDialog.find('.modal-title');
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var body = modalDialog.find('.modal-body');
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title.text(titleTxt);
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var p = document.createElement("p");
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p.innerHTML = bodyTxt;
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body.empty();
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body.append( p );
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if(!dialogOpen) {
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modalDialog.modal('toggle');
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dialogOpen = true;
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}
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}
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// This should stop people ticking more than the maximum permitted
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function updateCheckboxInteractivity() {
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var inputs = $("label input[type=checkbox]");
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if(selectedCount === MAX_SELECTIONS) {
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inputs.each(function() {
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var input = $(this);
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if(!input.prop('checked')){
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input.prop('disabled', true);
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}
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});
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} else {
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inputs.each(function() {
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var input = $(this);
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if(!input.prop('checked')) {
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input.prop('disabled', false);
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}
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});
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}
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}
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$("label input[type=checkbox]").change(function() {
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// Increment the selectedCount counter if a box has been checked
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if(this.checked) {
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selectedCount += 1;
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} else {
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selectedCount -= 1;
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// Just incase this falls below zero to avoid any nasty bugs
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if(selectedCount < 0) {
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selectedCount = 0;
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}
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}
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updateCheckboxInteractivity();
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});
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function isVotingInputValid() {
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var valid = true;
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// First establish if the user's selection count is valid
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if(!(selectedCount >= MIN_SELECTIONS && selectedCount <= MAX_SELECTIONS)) {
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valid = false;
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}
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if(selectedCount < MAX_SELECTIONS) {
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valid = false;
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}
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// This will highlight when people haven't selected enough options
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if(!valid) {
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let errText = "You've only selected " + selectedCount;
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if(selectedCount > 1) {
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errText += " options.";
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} else {
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errText = " You haven't selected any options.";
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}
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errText += " The minimum number you need to select is " + MIN_SELECTIONS + " and the maximum is "
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+ MAX_SELECTIONS + ". Please go back and correct this.";
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let titleTxt = 'Voting Error';
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showDialogWithText(titleTxt, errText);
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return;
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}
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return valid;
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}
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// Generates a blank vote as a string using the binary encoding scheme
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function genBlankVote() {
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var vote = "";
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for(var i = 0; i < OPTION_COUNT; i++) {
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vote += "0";
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if (i !== (OPTION_COUNT - 1)) {
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vote += ",";
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}
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}
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return vote;
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}
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var progressBar = document.getElementById("progress-bar");
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// Based on the user's vote in the current poll, this generates a ballot which
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// does not leak information about how many options the user has selected
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function generateBallot() {
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// Elliptic curve cryptography params used for encryption of encrypted vote
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// fragments
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var ctx = new CTX("BN254CX");
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var n = new ctx.BIG();
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var g1 = new ctx.ECP();
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var g2 = new ctx.ECP2();
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var parameter = $('#event-param').val();
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var tempParams = JSON.parse(JSON.parse(parameter).crypto);
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//copying the values
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n.copy(tempParams.n);
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g1.copy(tempParams.g1);
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g2.copy(tempParams.g2);
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var params = {
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n:n,
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g1:g1,
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g2:g2
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};
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var tempPK = JSON.parse($('#comb_pk').val());
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var pk = new ctx.ECP(0);
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pk.copy(tempPK.PK);
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// Collect together the unencrypted votes (which correspond to selected options)
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var checkboxInputs = $("label input[type=checkbox]");
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var unencryptedVotes = [];
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checkboxInputs.each(function() {
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var checkbox = $(this);
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// Push the selected option values (ones that have been checked) to an array
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if(checkbox.prop('checked')) {
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unencryptedVotes.push(checkbox.val());
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}
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});
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// If there is a dif between the num selected and the max allowed, push blank votes to the array to pad this
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// to prevent information leakage
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if(unencryptedVotes.length < MAX_SELECTIONS) {
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let blankVotesToPush = MAX_SELECTIONS - unencryptedVotes.length;
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for(let i = 0; i < blankVotesToPush; i++) {
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unencryptedVotes.push(genBlankVote());
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}
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}
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// Encrypt all of the votes for this ballot
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var encryptedVotes = [];
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unencryptedVotes.forEach(function(unencryptedVote) {
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var encFragments = [];
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// Encrypt each fragment of the unencrypted vote
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unencryptedVote.split(',').forEach(function(fragment) {
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var cipher = encrypt(params, pk, parseInt(fragment));
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// Store C1 and C2 from the cipher in the fragment
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var c1Bytes = [];
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cipher.C1.toBytes(c1Bytes);
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var c2Bytes = [];
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cipher.C2.toBytes(c2Bytes);
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encFragments.push({
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C1 : c1Bytes.toString(),
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C2 : c2Bytes.toString()
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});
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});
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// Store all fragments in a single 'encrypted vote'
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encryptedVotes.push({
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fragments: encFragments
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});
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});
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return {
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encryptedVotes: encryptedVotes
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};
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}
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$('#gen-ballots-btn').click(function() {
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// Ensure that the user selections are valid
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if(isVotingInputValid()) {
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// Hide the button
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$(this).toggleClass('hidden');
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// Inject the description progress bar which can then be updated by the encrypt btn
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$('#progress-bar-description').toggleClass('hidden');
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$('#progress-bar-container').toggleClass('hidden');
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setTimeout(generateBallotsAndShowUsr, 25);
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}
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});
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function voteSuccessfullyReceived() {
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let titleTxt = 'Vote Successfully Received';
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let bodyText = "Thank you for voting!";
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if(POLL_NUM !== POLL_COUNT) {
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bodyText += " You can vote on the next poll by closing down this dialog and clicking 'Next Poll'.";
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}
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showDialogWithText(titleTxt, bodyText);
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// Update the dialog's btns
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$('#cancelVoteBtn').addClass("hidden");
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$('#closeDialogBtn').removeClass("hidden");
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}
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var CSRF = $( "input[name='csrfmiddlewaretoken']" ).val();
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function csrfSafeMethod(method) {
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// these HTTP methods do not require CSRF protection
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return (/^(GET|HEAD|OPTIONS|TRACE)$/.test(method));
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}
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function sendBallotToServer(selection, ballot, ballotSelectionDialog) {
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// Use ajax to send the selected ballot to server
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$.ajaxSetup({
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beforeSend: function(xhr, settings) {
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if (!csrfSafeMethod(settings.type) && !this.crossDomain) {
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xhr.setRequestHeader("X-CSRFToken", CSRF);
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}
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}
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});
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$.ajax({
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type : "POST",
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url : window.location,
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data : JSON.stringify({ selection: selection, ballot: ballot}),
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success : function() {
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voteSuccessfullyReceived();
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}
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});
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// Update the client to inform the user that the vote is being processed
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showDialogWithText("Please Wait", "Processing Vote. Please wait...");
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}
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var bytestostring = function(b) {
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var s = "";
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var len = b.length;
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var ch;
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for (var i = 0; i < len; i++) {
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ch = b[i];
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s += ((ch >>> 4) & 15).toString(16);
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s += (ch & 15).toString(16);
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}
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return s;
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};
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var stringtobytes = function(s) {
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var b = [];
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for (var i = 0; i < s.length; i++) {
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b.push(s.charCodeAt(i));
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}
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return b;
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};
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function SHA256Hash(bytes, toStr) {
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var ctx = new CTX();
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var R = [];
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var H = new ctx.HASH256();
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H.process_array(bytes);
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R = H.hash();
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if (R.length === 0) {
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return null;
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}
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if(toStr) {
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// If toStr is true we return the stringified version of the bytes of the hash
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return bytestostring(R);
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} else {
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// If toStr is false we return the bytes of the hash
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return R;
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}
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}
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// FAO Ben: Called once the ballot has been sent to the back-end and dialog has closed
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function onAfterBallotSend() {
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// TODO: FAO Ben: Implement QR func here.
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// TODO: Currently, there is a dialog already implemented in the event_vote.html page which is
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// TODO: used for voting error information but could be used to display the QR code using JS in
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// TODO: a similar way that showBallotChoiceDialog does.
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}
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function processBallotSelection(selection, selectedBallot, selectedBallotHash, dialog, successFn) {
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// Dispatch the ballot to the server
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sendBallotToServer(selection, selectedBallot, dialog);
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// Call the successfn currently with the selection hash but this may not be needed
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successFn(selectedBallotHash);
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}
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function showBallotChoiceDialog(ballotA, ballotB) {
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// Output hashes of the 2 ballots
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const BALLOT_A_HASH = SHA256Hash(stringtobytes(JSON.stringify(ballotA)), true);
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const BALLOT_B_HASH = SHA256Hash(stringtobytes(JSON.stringify(ballotB)), true);
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// With the ballots and their hashes generated, we can display the ballot choice dialog
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var modalDialog = $('#modalDialog');
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var title = modalDialog.find('.modal-title');
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var body = modalDialog.find('.modal-body');
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body.empty();
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title.text('Please Select a Ballot');
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// Generate the body of the dialog which consists of a button for A and for B as well as their hashes
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var choiceGroupDiv = document.createElement('div');
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choiceGroupDiv.setAttribute('class', 'choice-group');
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var btnChoiceA = document.createElement('a');
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btnChoiceA.setAttribute('id', 'choice-A');
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btnChoiceA.setAttribute('class', 'btn btn-sq btn-primary');
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btnChoiceA.innerHTML = 'A';
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choiceGroupDiv.append(btnChoiceA);
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var btnChoiceB = document.createElement('a');
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btnChoiceB.setAttribute('id', 'choice-B');
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btnChoiceB.setAttribute('class', 'btn btn-sq btn-warning choice');
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btnChoiceB.innerHTML = 'B';
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choiceGroupDiv.append(btnChoiceB);
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// ----------------------------------------------
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var hashGroupDiv = document.createElement('div');
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var br = document.createElement('br');
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hashGroupDiv.append( br );
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var hashA = document.createElement("span");
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hashA.innerHTML = "Hash A: " + BALLOT_A_HASH;
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hashGroupDiv.append( hashA );
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var br2 = document.createElement('br');
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hashGroupDiv.append( br2 );
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var hashB = document.createElement("span");
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hashB.innerHTML = "Hash B: " + BALLOT_B_HASH;
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hashGroupDiv.append( hashB );
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// -----------------------------------------------
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body.append(choiceGroupDiv);
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body.append(hashGroupDiv);
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// Prepare the appropriate dialog buttons
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$('#cancelVoteBtn').removeClass("hidden");
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$('#closeDialogBtn').removeClass("hidden").addClass("hidden");
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if(!dialogOpen) {
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modalDialog.modal('toggle');
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dialogOpen = true;
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}
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// Register callback functions for the selection of either A or B
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$('#choice-A').click(function(e) {
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processBallotSelection("A", ballotA, BALLOT_A_HASH, modalDialog, onAfterBallotSend);
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});
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$('#choice-B').click(function(e) {
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processBallotSelection("B", ballotB, BALLOT_B_HASH, modalDialog, onAfterBallotSend);
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});
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}
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function generateBallotB(ballotA) {
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var ballotB = generateBallot();
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progressBar.setAttribute("style", "width: 100%;");
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showBallotChoiceDialog(ballotA, ballotB);
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}
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function generateBallotsAndShowUsr() {
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// Generate Ballot A and Ballot B to be displayed to the user
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// This fn starts the process
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var ballotA = generateBallot();
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// Update the progress bar once the generation has completed
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progressBar.setAttribute("style", "width: 50%;");
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// This delay allows the execution thread to update the above CSS on the progress bar
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setTimeout(function () {
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generateBallotB(ballotA);
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}, 150);
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}
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$('#modalDialog').on('hide.bs.modal', function (e) {
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var titleText = $(this).find('.modal-title').text();
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if(titleText.indexOf("Received") > -1) {
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// Update page to reflect the fact that a vote has taken place
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location.reload();
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} else {
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// Reset poll voting to allow user to vote again
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progressBar.setAttribute("style", "width: 0%;");
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$('#gen-ballots-btn').toggleClass("hidden");
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$('#progress-bar-description').toggleClass('hidden');
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$('#progress-bar-container').toggleClass('hidden');
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var inputs = $("label input[type=checkbox]");
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inputs.each(function () {
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var input = $(this);
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input.prop('checked', false);
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input.prop('disabled', false);
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});
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selectedCount = 0;
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}
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dialogOpen = false;
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}); |