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proof-app.js
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proof-app.js
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// Copyright (c) Simon Worthington, Register Dynamics Ltd.
// All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software
// and associated documentation files (the "Software"), to deal in the Software without restriction,
// including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
// BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
// OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
var showProof = function(proofJson) {
var itemJson = getItemFromProof(proofJson);
document.getElementById("title").innerText = proofJson.register.name;
document.getElementById('data').innerHTML = "";
for (var property in itemJson) {
var field = document.createElement("div");
var title = document.createElement("h2");
title.innerText = property;
var value = document.createElement("span");
value.innerText = itemJson[property];
field.appendChild(title);
field.appendChild(value);
document.getElementById('data').appendChild(field);
}
document.getElementById("results").classList.add("shown");
}
var showVerification = function(verified) {
var box = document.getElementById("proof");
box.classList.remove("verified-true");
box.classList.remove("verified-false");
box.classList.add("verified-" + verified);
}
var getItemFromProof = function(proofJson) {
return JSON.parse(/{.+}/.exec(proofJson.entry)[0]);
}
// TODO: mechanism for permanently storing scan history
// this is just the DOM and hence will disappear upon refresh
// instead we should store history in a more long-lived browser store
var scanHistory = [];
var process = function(data) {
try {
var proofJson = JSON.parse(data);
if (!proofJson.hasOwnProperty('audit')) throw TypeError;
if (!proofJson.hasOwnProperty('index')) throw TypeError;
if (!proofJson.hasOwnProperty('register')) throw TypeError;
if (!proofJson.hasOwnProperty('entry')) throw TypeError;
if (!proofJson.register.hasOwnProperty('name')) throw TypeError;
if (!proofJson.register.hasOwnProperty('size')) throw TypeError;
stopScan();
scanHistory.unshift({content: proofJson, when: new Date()});
refreshHistory();
showProof(proofJson);
var rootHash = webBase64ToBits(rootHashes[proofJson.register.name]);
// Registers have their entry numbers starting from 1 and not 0 so we need to -1 here
var verified = isProved(proofJson.entry, proofJson.index-1, proofJson.register.size, proofJson.audit.map(webBase64ToBits), rootHash);
showVerification(verified);
} catch (e) {
console.log("Not valid Registers item json!");
console.log(e);
continueScan();
return;
}
};
var refreshHistory = function() {
var historyScene = document.querySelector("#history div");
historyScene.innerHTML = "";
for (var i in scanHistory) {
var scan = document.createElement("div");
var title = document.createElement("span");
var register = scanHistory[i].content.register.name;
var itemJson = getItemFromProof(scanHistory[i].content);
title.innerText = register.charAt(0).toUpperCase() + register.slice(1) + ": " + itemJson[register];
var when = document.createElement("h2");
when.innerText = scanHistory[i].when.toLocaleDateString() + " " + scanHistory[i].when.toLocaleTimeString();
scan.appendChild(when);
scan.appendChild(title);
historyScene.appendChild(scan);
}
}
var startScan = function() {
qrcode.callback = process;
qrcode.setWebcam('scanner');
};
var continueScan = function () {
qrcode.captureToCanvas();
};
var stopScan = function() {
qrcode.video.srcObject.getVideoTracks()[0].stop();
};
var maybeScan = function() {
if (window.location.hash == "#scanner" || window.location.hash == "") {
startScan();
} else {
stopScan();
}
};
window.addEventListener("load", maybeScan);
window.addEventListener("load", refreshHistory);
window.addEventListener("hashchange", maybeScan);
window.addEventListener("load", function() {
document.getElementById("close").addEventListener("click", function() {
document.getElementById("results").classList.remove("shown");
startScan();
});
});