blob: 96605f9fc31b3f0c77c0a9eebfa5074ae18ae9c9 (
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document.addEventListener('DOMContentLoaded', () => {
const messageEncoder = new TextEncoder();
const hashcashAttemptBatchSize = 1000;
const acceptableHash = (hash) => hash[0] === 0 && hash[1] === 0;
const checkSalt = (message, salt, thenC, elseC) => {
const saltedMessage = `Hashcash-Salt: ${salt}\n\n${message}`;
const encodedSaltedMessage = messageEncoder.encode(saltedMessage);
crypto.subtle.digest('SHA-256', encodedSaltedMessage).then((hashBuf) => {
if (acceptableHash(new Uint8Array(hashBuf))) {
thenC();
} else {
elseC();
}
});
};
const commentForms = document.getElementsByClassName('comment-form');
for (const commentForm of commentForms) {
const hashcashSaltInput = commentForm.querySelector('input[name=hashcash-salt]');
const messageTextarea = commentForm.querySelector('textarea[name=message]');
const submitButton = commentForm.querySelector('input[type=submit]');
let salt = 0;
const tryHashcash = () => {
checkSalt(messageTextarea.value, salt, () => {
hashcashSaltInput.value = salt;
console.log(`hashcash ok ${salt}`);
submitButton.toggleAttribute('disabled');
commentForm.submit();
}, () => {
++salt;
if (salt % hashcashAttemptBatchSize === 0) {
console.log(`hashcash fail ${salt}, retrying`);
}
setTimeout(tryHashcash, 0);
});
};
commentForm.addEventListener(
'submit',
(event) => {
event.preventDefault();
submitButton.setAttribute('disabled', 'disabled');
setTimeout(tryHashcash, 0);
});
}
});
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