705 lines
22 KiB
JavaScript
705 lines
22 KiB
JavaScript
var dialogOpen = false;
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var DIALOG_BTN_STATES = {
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STEP_1: 1,
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STEP_2: 2,
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STEP_3: 3,
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VOTE_SUCCESS: 4,
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VOTE_ERROR: 5
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};
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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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function updateDialogButtons(state) {
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// Trigger the btn selectors once here
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let nextDialogBtn = $('#nextDialogBtn');
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let cancelDialogBtn = $('#cancelDialogBtn');
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let closeDialogBtn = $('#closeDialogBtn');
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let startOverDialogBtn = $('#startOverDialogBtn');
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let submitDialogBtn = $('#submitDialogBtn');
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switch(state) {
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case DIALOG_BTN_STATES.STEP_1:
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nextDialogBtn.removeClass("hidden");
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cancelDialogBtn.removeClass("hidden");
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closeDialogBtn.addClass("hidden");
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startOverDialogBtn.addClass("hidden");
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submitDialogBtn.addClass("hidden");
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break;
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case DIALOG_BTN_STATES.STEP_2:
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nextDialogBtn.addClass("hidden");
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cancelDialogBtn.removeClass("hidden");
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closeDialogBtn.addClass("hidden");
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startOverDialogBtn.addClass("hidden");
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submitDialogBtn.addClass("hidden");
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break;
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case DIALOG_BTN_STATES.STEP_3:
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nextDialogBtn.addClass("hidden");
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cancelDialogBtn.addClass("hidden");
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closeDialogBtn.addClass("hidden");
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startOverDialogBtn.removeClass("hidden");
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submitDialogBtn.removeClass("hidden");
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break;
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case DIALOG_BTN_STATES.VOTE_SUCCESS:
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case DIALOG_BTN_STATES.VOTE_ERROR:
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nextDialogBtn.addClass("hidden");
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cancelDialogBtn.addClass("hidden");
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closeDialogBtn.removeClass("hidden");
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startOverDialogBtn.addClass("hidden");
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submitDialogBtn.addClass("hidden");
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break;
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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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// 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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updateDialogButtons(DIALOG_BTN_STATES.VOTE_ERROR);
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return;
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}
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return valid;
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}
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var progressBar = document.getElementById("progress-bar");
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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(generateBallots, 25);
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}
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});
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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, C2 and r 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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var rBytes = [];
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cipher.r.toBytes(rBytes);
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encFragments.push({
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C1 : c1Bytes.toString(),
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C2 : c2Bytes.toString(),
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r : rBytes.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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// 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 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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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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function generateBallots() {
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// Get the user's selected option
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let inputs = $("label input[type=checkbox]");
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let selectedOption = "";
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inputs.each(function() {
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let input = $(this);
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if(input.prop('checked')) {
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selectedOption = input.val();
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selectedOption = document.getElementById(selectedOption).innerText;
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}
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});
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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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var ballotB = generateBallot();
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progressBar.setAttribute("style", "width: 100%;");
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showIDsQRCode(ballotA, ballotB, selectedOption);
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}, 150);
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}
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function showIDsQRCode(ballotA, ballotB, selectedOption) {
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var voterID = window.location.search.slice(1).split(/=(.+)/)[1];
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var eventID = window.location.href.split('/')[4];
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var pollID = $('#poll-num').text();
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// Display a QR code with ID details
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var modalDialog = $('#modalDialog');
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var title = modalDialog.find('.modal-title');
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var body = modalDialog.find('.modal-body');
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body.empty();
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title.text('Step 0 of 3: Scan this');
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let pleaseScanP = document.createElement('p');
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pleaseScanP.innerHTML = "Please scan the following QR code from your DEMOS 2 mobile application:";
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let QRDiv = document.createElement('div');
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var QRCodeImg = document.createElement('img');
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QRCodeImg.setAttribute('class', 'QR-code');
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QRCodeImg.setAttribute('id', "qr-img");
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new QRCode(QRCodeImg, voterID+";"+eventID+";"+pollID);
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QRDiv.append(QRCodeImg);
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body.append(pleaseScanP);
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body.append(QRDiv);
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// Prepare the appropriate dialog buttons
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updateDialogButtons(DIALOG_BTN_STATES.STEP_1);
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if(!dialogOpen) {
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modalDialog.modal('toggle');
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dialogOpen = true;
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}
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$('#nextDialogBtn').click(function(e) {
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showHashQRCode(ballotA, ballotB, selectedOption);
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});
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};
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// Called in stage 1 of 3 in the voting process
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function showHashQRCode(ballotA, ballotB, selectedOption) {
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var ballots = new Array(ballotA, ballotB);
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var ballotHashes = new Array(2);
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// Hash both ballots and store
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for (let i = 0; i <= 1; i++)
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ballotHashes[i] = SHA256Hash(stringtobytes(JSON.stringify(ballots[i])), true);
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// With the ballots and their hashes generated, we can display the QR code of both hashes
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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('Step 1 of 3: Link Your Vote');
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let pleaseScanP = document.createElement('p');
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pleaseScanP.innerHTML = "Please scan the following QR code from your DEMOS 2 auditor:";
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let QRDiv = document.createElement('div');
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var QRCodeImg = document.createElement('img');
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QRCodeImg.setAttribute('class', 'QR-code');
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QRCodeImg.setAttribute('id', "qr-img");
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new QRCode(QRCodeImg, ballotHashes[0] + ';' + ballotHashes[1]);
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QRDiv.append(QRCodeImg);
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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: " + ballotHashes[0];
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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: " + ballotHashes[1];
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hashGroupDiv.append( hashB );
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// -----------------------------------------------
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body.append(pleaseScanP);
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body.append(QRDiv);
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body.append(hashGroupDiv);
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// Prepare the appropriate dialog buttons
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updateDialogButtons(DIALOG_BTN_STATES.STEP_1);
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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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$('#nextDialogBtn').click(function(e) {
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showBallotChoiceDialog(ballots, ballotHashes, selectedOption, modalDialog);
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});
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}
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// Called in stage 2 of 3 in the voting process
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function showBallotChoiceDialog(ballots, ballotHashes, selectedOption, dialog) {
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// Display the ballot choice dialog
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var title = dialog.find('.modal-title');
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var body = dialog.find('.modal-body');
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body.empty();
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title.text('Step 2 of 3: Select a Ballot');
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// Generate the body of the dialog which consists of a button for A and for B
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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: " + ballotHashes[0];
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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: " + ballotHashes[1];
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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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// Register callback functions for the selection of either A or B
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$('#choice-A').click(function(e) {
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showSelectionConfirmationDialog("A", ballots[0], ballotHashes[0], ballots[1], selectedOption, dialog);
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});
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$('#choice-B').click(function(e) {
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showSelectionConfirmationDialog("B", ballots[1], ballotHashes[1], ballots[0], selectedOption, dialog);
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});
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updateDialogButtons(DIALOG_BTN_STATES.STEP_2);
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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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// Called in stage 3 of 3 in the voting process
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function showSelectionConfirmationDialog(selection, selectedBallot, selectedBallotHash,
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otherBallot, selectedOption, dialog) {
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let title = dialog.find('.modal-title');
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let body = dialog.find('.modal-body');
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body.empty();
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title.text("Step 3 of 3: Confirm Ballot Selection");
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// Ballot detail section
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let selectedInfoSecDiv = document.createElement('div');
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let detailsP = document.createElement('p');
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detailsP.innerHTML = "Please check the following details are correct: ";
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selectedInfoSecDiv.append(detailsP);
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let ul = document.createElement('ul');
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let selectedOptionLi = document.createElement('li');
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selectedOptionLi.innerHTML = "Selected Option: " + selectedOption;
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let ballotSelectionLi = document.createElement('li');
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ballotSelectionLi.innerHTML = "Selected Ballot: " + selection;
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let ballotHashLi = document.createElement('li');
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ballotHashLi.innerHTML = "SHA256 Ballot Fingerprint: " + selectedBallotHash;
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ul.append(selectedOptionLi);
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ul.append(ballotSelectionLi);
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ul.append(ballotHashLi);
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selectedInfoSecDiv.append(ul);
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// Instruction section
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let instructionsP = document.createElement('p');
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instructionsP.innerHTML = "If you are happy with your selection you can click on the 'Submit' button below to store"
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+ " your vote. Otherwise you can select 'Start Over' to go through the voting process again.";
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selectedInfoSecDiv.append(instructionsP);
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let additionalInstructionsP = document.createElement('p');
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additionalInstructionsP.innerHTML = "You can overwrite your vote later by re-visiting this page and voting again.";
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selectedInfoSecDiv.append(additionalInstructionsP);
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body.append(selectedInfoSecDiv);
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// Update the dialog buttons accordingly
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updateDialogButtons(DIALOG_BTN_STATES.STEP_3);
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$('#submitDialogBtn').click(function() {
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// Dispatch the ballot to the server
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sendBallotsToServer(selection, selectedBallot, otherBallot);
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});
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|
|
if(!dialogOpen) {
|
|
modalDialog.modal('toggle');
|
|
dialogOpen = true;
|
|
}
|
|
}
|
|
|
|
function sendBallotsToServer(selection, selectedBallot, otherBallot) {
|
|
$.ajaxSetup({
|
|
beforeSend: function(xhr, settings) {
|
|
if (!csrfSafeMethod(settings.type) && !this.crossDomain) {
|
|
xhr.setRequestHeader("X-CSRFToken", CSRF);
|
|
}
|
|
}
|
|
});
|
|
|
|
// Elliptic curve cryptography params used for encryption of encrypted vote
|
|
// fragments
|
|
var ctx = new CTX("BN254CX");
|
|
var n = new ctx.BIG();
|
|
var g1 = new ctx.ECP();
|
|
var g2 = new ctx.ECP2();
|
|
|
|
var parameter = $('#event-param').val();
|
|
var tempParams = JSON.parse(JSON.parse(parameter).crypto);
|
|
|
|
//copying the values
|
|
n.copy(tempParams.n);
|
|
g1.copy(tempParams.g1);
|
|
g2.copy(tempParams.g2);
|
|
|
|
var params = {
|
|
n:n,
|
|
g1:g1,
|
|
g2:g2
|
|
};
|
|
|
|
var tempPK = JSON.parse($('#comb_pk').val());
|
|
var pk = new ctx.ECP(0);
|
|
pk.copy(tempPK.PK);
|
|
|
|
// Prepares the unselected ballot to send, encrypted, to the server.
|
|
// Creates the unique ballot ID for the unselected ballot
|
|
var voterID = window.location.search.slice(1).split(/=(.+)/)[1];
|
|
var eventID = window.location.href.split('/')[4];
|
|
var pollNum = $('#poll-num').text();
|
|
var ballotID = encodeURIComponent(btoa(JSON.stringify({voterID: voterID, eventID: eventID, pollNum: pollNum})));
|
|
// TODO: Generate a SK rather than using a static one. UUID generated server side and then injected JS side?
|
|
var SK = "temporary";
|
|
var encAlt = sjcl.encrypt(SK, JSON.stringify({ballotID: ballotID, ballot: otherBallot}));
|
|
|
|
// Generates an HMAC to protect the encrypted ballot from tampering.
|
|
var out = (new sjcl.misc.hmac(key, sjcl.hash.sha256)).mac(encAlt);
|
|
var hmac = sjcl.codec.hex.fromBits(out);
|
|
|
|
// Prepares the selected ballot to submit to the server.
|
|
let selectedBallotAsStr = JSON.stringify(selectedBallot);
|
|
$.ajax({
|
|
type : "POST",
|
|
url : window.location,
|
|
data : { handle: ballotID, encBallot: encAlt, ballot: selectedBallotAsStr, selection: selection },
|
|
success : function(){
|
|
onAfterBallotSend(ballotID, SK, hmac);
|
|
}
|
|
});
|
|
}
|
|
|
|
// Called once the ballot has been sent to the back-end and dialog has closed
|
|
function onAfterBallotSend(ballotID, SK, hmac) {
|
|
// With one ballot selected, we can display a QR code of the ballot ID
|
|
var modalDialog = $('#modalDialog');
|
|
var title = modalDialog.find('.modal-title');
|
|
var body = modalDialog.find('.modal-body');
|
|
body.empty();
|
|
|
|
let titleText = 'Vote Successfully Received';
|
|
title.text(titleText);
|
|
|
|
// Add the first section: Instructions on next steps
|
|
let instructions1Txt = "Thank you for voting! Please note down the ballot identifier by scanning " +
|
|
"this QR code using the DEMOS2 mobile application: ";
|
|
|
|
var instructions1P = document.createElement("p");
|
|
instructions1P.innerHTML = instructions1Txt;
|
|
body.append(instructions1P);
|
|
|
|
// Add the second section: QR code that contains the ballot identifier and HMAC
|
|
var QRCodeImg = document.createElement('img');
|
|
QRCodeImg.setAttribute('class', 'QR-code');
|
|
new QRCode(QRCodeImg, ballotID+";"+btoa(hmac));
|
|
|
|
body.append(QRCodeImg);
|
|
|
|
// Add the third section: instructions on Ballot ID and SK
|
|
let instructions2Div = document.createElement('div');
|
|
instructions2Div.setAttribute('class', 'containerMarginTop');
|
|
|
|
let instructions2Txt = "You will also be emailed the ballot identifier. However, you will need to note down the following " +
|
|
"secret in order to later verify your ballot was cast as recorded: ";
|
|
let instructions2P = document.createElement('p');
|
|
instructions2P.innerHTML = instructions2Txt;
|
|
instructions2Div.append(instructions2P);
|
|
body.append(instructions2Div);
|
|
|
|
// Add the fourth section: SK plain text
|
|
let SKContainerDiv = document.createElement('div');
|
|
SKContainerDiv.setAttribute("class", "containerMarginTop");
|
|
|
|
let SKDiv = document.createElement('div');
|
|
SKDiv.setAttribute("class", "skDIV");
|
|
|
|
let SKP = document.createElement('p');
|
|
SKP.innerHTML = SK;
|
|
SKDiv.append(SKP);
|
|
|
|
SKContainerDiv.append(SKDiv);
|
|
body.append(SKContainerDiv);
|
|
|
|
// Conditional fifth section: Instructions on how to vote on the next poll for the event
|
|
if(POLL_NUM !== POLL_COUNT) {
|
|
let instructions3Txt = "You can vote on the next poll by closing down this dialog and clicking 'Next Poll'.";
|
|
let instructions3P = document.createElement('p');
|
|
instructions3P.innerHTML = instructions3Txt;
|
|
body.append(instructions3P);
|
|
}
|
|
|
|
updateDialogButtons(DIALOG_BTN_STATES.VOTE_SUCCESS);
|
|
}
|
|
|
|
$('#modalDialog').on('hide.bs.modal', function (e) {
|
|
var titleText = $(this).find('.modal-title').text();
|
|
|
|
if(titleText.indexOf("Received") > -1) {
|
|
// Update page to reflect the fact that a vote has taken place
|
|
location.reload();
|
|
} else if (titleText.indexOf("Error") === -1) {
|
|
// Reset poll voting to allow user to vote again
|
|
progressBar.setAttribute("style", "width: 0%;");
|
|
$('#gen-ballots-btn').toggleClass("hidden");
|
|
$('#progress-bar-description').toggleClass('hidden');
|
|
$('#progress-bar-container').toggleClass('hidden');
|
|
|
|
var inputs = $("label input[type=checkbox]");
|
|
inputs.each(function () {
|
|
var input = $(this);
|
|
input.prop('checked', false);
|
|
input.prop('disabled', false);
|
|
});
|
|
|
|
selectedCount = 0;
|
|
}
|
|
|
|
dialogOpen = false;
|
|
}); |