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check-token.html
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check-token.html
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<!doctype html>
<meta charset="utf-8">
<title>Check an Origin Trial token</title>
<meta content="width=device-width, initial-scale=1, shrink-to-fit=no" name="viewport">
<style>
th { text-align: right; }
#validity { color: #000; background-color: #8f8; }
#validity.invalid { color: #fff; background-color: #f00; }
</style>
<h1>Check an Origin Trial token</h1>
<p>
<label>Paste the token here<br>
<textarea id="token" placeholder="Token" autofocus cols="50" rows="6"></textarea>
</label>
</p>
<p>
<label>Is this a test token? (generated by Chromium utility, not Origin Trials developer console)<br>
<input id="istesttoken" type="checkbox"></input>
</label>
</p>
<table>
<tr><th>Valid?</th><td><span id="validity"></span></td></tr>
<tr><th>Version</th><td><span id="version"></span></td></tr>
<tr><th>Origin</th><td><span id="origin"></span></td></tr>
<tr><th>Matches Subdomains?</th><td><span id="subdomain"></span></td></tr>
<tr><th>Matches Third-party?</th><td><span id="thirdparty"></span></td></tr>
<tr><th>Usage Restriction</th><td><span id="usage"></span></td></tr>
<tr><th>Feature</th><td><span id="feature"></span></td></tr>
<tr><th>Expires</th><td><span id="expiry"></span></td></tr>
</table>
<script type="text/javascript"
src="https://cdn.rawgit.com/tonyg/js-nacl/09d04c712117961a21aebf9c4735eb04f05ea79e/lib/nacl_factory.js"
crossorigin="anonymous"
integrity="sha384-k1LT12bBTLMRe+VRFdE0F4iaPU3RO5oSILEsw4TJ8eNtzZLlMuWY4MShH79NAmU8">
</script>
<script>
// Production key for validating signatures on tokens issued by the production OT console.
// From https://source.chromium.org/chromium/chromium/src/+/master:components/embedder_support/origin_trials/origin_trial_policy_impl.cc;l=23;drc=073e74ade285c0c22ef01bccdf260854d7b1aa85
// as of 2021-01-14.
const kProductionPublicKey = new Uint8Array([
0x7c, 0xc4, 0xb8, 0x9a, 0x93, 0xba, 0x6e, 0xe2, 0xd0, 0xfd, 0x03,
0x1d, 0xfb, 0x32, 0x66, 0xc7, 0x3b, 0x72, 0xfd, 0x54, 0x3a, 0x07,
0x51, 0x14, 0x66, 0xaa, 0x02, 0x53, 0x4e, 0x33, 0xa1, 0x15,
]);
// Test key for validating signatures on tokens issued for Chromium test purposes.
// From https://source.chromium.org/chromium/chromium/src/+/master:third_party/blink/common/origin_trials/trial_token_unittest.cc;l=40;drc=dbd8b9731136091384f48592a664b3c01be1a822
// as of 2021-01-14.
const kTestPublicKey = new Uint8Array([
0x75, 0x10, 0xac, 0xf9, 0x3a, 0x1c, 0xb8, 0xa9, 0x28, 0x70, 0xd2,
0x9a, 0xd0, 0x0b, 0x59, 0xe1, 0xac, 0x2b, 0xb7, 0xd5, 0xca, 0x1f,
0x64, 0x90, 0x08, 0x8e, 0xa8, 0xe0, 0x56, 0x3a, 0x04, 0xd0,
]);
const tokenElem = document.getElementById("token");
const isTestElem = document.getElementById("istesttoken");
const validityElem = document.getElementById("validity");
const versionElem = document.getElementById("version");
const originElem = document.getElementById("origin");
const subdomainElem = document.getElementById("subdomain");
const thirdpartyElem = document.getElementById("thirdparty");
const usageElem = document.getElementById("usage");
const featureElem = document.getElementById("feature");
const expiryElem = document.getElementById("expiry");
let nacl;
nacl_factory.instantiate(readyNacl => { nacl = readyNacl; });
const utf8Decoder = new TextDecoder("utf-8", {fatal: true});
function validate() {
validityElem.textContent = "";
validityElem.classList.add("invalid");
originElem.textContent = "";
subdomainElem.textContent = "";
thirdpartyElem.textContent = "";
featureElem.textContent = "";
expiryElem.textContent = "";
// Base64-decode the token into a Uint8Array.
let tokenStr;
try {
tokenStr = atob(tokenElem.value);
} catch(e) {
console.error(e);
validityElem.textContent = "Invalid Base64";
return;
}
const token = new Uint8Array(tokenStr.length);
for (let i = 0; i < token.length; i++) {
token[i] = tokenStr.charCodeAt(i);
}
// Check that the version number is 2 or 3.
console.log(token);
const version = token[0];
versionElem.textContent = "" + version;
if (version !== 2 && version !== 3) {
validityElem.textContent = "Unknown version";
return;
}
// Pull the fields out of the token.
if (token.length < 69) {
validityElem.textContent = "Token is too short";
return;
}
const signature = new Uint8Array(token.buffer, 1, 64);
const payloadLength = new DataView(token.buffer, 65, 4).getInt32(0, /*littleEndian=*/false);
const payload = new Uint8Array(token.buffer, 69);
if (payload.length !== payloadLength) {
validityElem.textContent =
"Token is " + payload.length + " bytes; expected " + payloadLength;
return;
}
// The version + length + payload is signed.
const signedData = new Uint8Array(token.buffer.slice(64));
signedData[0] = token[0];
// Check the ED25519 signature.
const publicKey = isTestElem.checked ? kTestPublicKey : kProductionPublicKey;
if (!nacl.crypto_sign_verify_detached(signature, signedData, publicKey)) {
validityElem.textContent = "Invalid signature";
return;
}
// Pull the fields out of the JSON payload.
let json;
try {
json = utf8Decoder.decode(payload);
} catch(e) {
console.error(e);
validityElem.textContent = "Invalid UTF-8";
return;
}
console.log("Token JSON", json);
let obj;
try {
obj = JSON.parse(json);
} catch(e) {
console.error(e);
validityElem.textContent = "Invalid JSON";
return;
}
originElem.textContent = obj.origin;
subdomainElem.textContent = obj.isSubdomain ? "Yes" : "No";
thirdpartyElem.textContent = obj.isThirdParty ? "Yes" : "No";
usageElem.textContent = obj.usage;
featureElem.textContent = obj.feature;
let expiry;
try {
expiry = parseInt(obj.expiry);
} catch(e) {
console.error(e);
validityElem.textContent = "Expiry value wasn't an integer";
expiryElem.textContent = obj.expiry;
return;
}
let expiryDate = new Date(expiry * 1000);
expiryElem.textContent = expiryDate.toLocaleString();
if (expiryDate < new Date()) {
validityElem.textContent = "Expired"
return;
}
validityElem.classList.remove("invalid");
validityElem.textContent = "Valid";
}
tokenElem.oninput = validate;
isTestElem.oninput = validate;
</script>