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proper handling of steve/alex

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it's more complex than just even/odd UUID
This commit is contained in:
jomo 2015-02-27 01:07:09 +01:00
parent a55dde25a3
commit 9c8df06c6b
2 changed files with 60 additions and 19 deletions
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21
modules/skins.js
View File

@ -84,12 +84,23 @@ exp.resize_img = function(inname, size, callback) {
});
};
// returns "alex" or "steve" calculated by the +userId+
exp.default_skin = function(userId) {
if (Number("0x" + userId[31]) % 2 === 0) {
return "alex";
} else {
// returns "alex" or "steve" calculated by the +uuid+
exp.default_skin = function(uuid) {
if (uuid.length <= 16) {
// we can't get the
return "steve";
} else {
// great thanks to Minecrell for research into Minecraft and Java's UUID hashing!
// https://git.io/xJpV
// MC uses `uuid.hashCode() & 1` for alex
// that can be compacted to counting the LSBs of every 4th byte in the UUID
// an odd sum means alex, an even sum means steve
// XOR-ing all the LSBs gives us 1 for alex and 0 for steve
var lsbs_even = parseInt(uuid[07], 16) ^
parseInt(uuid[15], 16) ^
parseInt(uuid[23], 16) ^
parseInt(uuid[31], 16);
return lsbs_even ? "alex" : "steve";
}
};

58
test/test.js
View File

@ -26,6 +26,30 @@ var names = fs.readFileSync("test/usernames.txt").toString().split(/\r?\n/);
var uuid = uuids[Math.round(Math.random() * (uuids.length - 1))];
var name = names[Math.round(Math.random() * (names.length - 1))];
// Let's hope these will never be assigned
var steve_ids = [
"fffffff0"+"fffffff0"+"fffffff0"+"fffffff0",
"fffffff0"+"fffffff0"+"fffffff1"+"fffffff1",
"fffffff0"+"fffffff1"+"fffffff0"+"fffffff1",
"fffffff0"+"fffffff1"+"fffffff1"+"fffffff0",
"fffffff1"+"fffffff0"+"fffffff0"+"fffffff1",
"fffffff1"+"fffffff0"+"fffffff1"+"fffffff0",
"fffffff1"+"fffffff1"+"fffffff0"+"fffffff0",
"fffffff1"+"fffffff1"+"fffffff1"+"fffffff1",
];
// Let's hope these will never be assigned
var alex_ids = [
"fffffff0"+"fffffff0"+"fffffff0"+"fffffff1",
"fffffff0"+"fffffff0"+"fffffff1"+"fffffff0",
"fffffff0"+"fffffff1"+"fffffff0"+"fffffff0",
"fffffff0"+"fffffff1"+"fffffff1"+"fffffff1",
"fffffff1"+"fffffff0"+"fffffff0"+"fffffff0",
"fffffff1"+"fffffff0"+"fffffff1"+"fffffff1",
"fffffff1"+"fffffff1"+"fffffff0"+"fffffff1",
"fffffff1"+"fffffff1"+"fffffff1"+"fffffff0",
];
var rid = "TestReqID: ";
function getRandomInt(min, max) {
@ -107,13 +131,9 @@ describe("Crafatar", function() {
});
});
describe("Avatar", function() {
// profile "Alex" - hoping it'll never have a skin
var alex_uuid = "ec561538f3fd461daff5086b22154bce";
// profile "Steven" (Steve doesn't exist) - hoping it'll never have a skin
var steven_uuid = "b8ffc3d37dbf48278f69475f6690aabd";
it("uuid's account should exist, but skin should not", function(done) {
networking.get_profile(rid, alex_uuid, function(err, profile) {
// profile "Alex" - hoping it'll never have a skin
networking.get_profile(rid, "ec561538f3fd461daff5086b22154bce", function(err, profile) {
assert.notStrictEqual(profile, null);
networking.get_uuid_url(profile, 1, function(url) {
assert.strictEqual(url, null);
@ -121,14 +141,24 @@ describe("Crafatar", function() {
});
});
});
it("odd UUID should default to Alex", function(done) {
assert.strictEqual(skins.default_skin(alex_uuid), "alex");
done();
});
it("even UUID should default to Steve", function(done) {
assert.strictEqual(skins.default_skin(steven_uuid), "steve");
done();
});
for (var a in alex_ids) {
var alex_id = alex_ids[a];
(function(alex_id) {
it("UUID " + alex_id + " should default to Alex", function(done) {
assert.strictEqual(skins.default_skin(alex_id), "alex");
done();
});
})(alex_id);
}
for (var s in steve_ids) {
var steve_id = steve_ids[s];
(function(steve_id) {
it("UUID " + steve_id + " should default to Steve", function(done) {
assert.strictEqual(skins.default_skin(steve_id), "steve");
done();
});
})(steve_id);
}
});
describe("Errors", function() {
it("should time out on uuid info download", function(done) {