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import * as crypto from 'crypto';
const USER_AGENT =
'lyric tool (source: https://code.tvl.fyi/tree/users/Profpatsch/lyric, contact: https://mastodon.xyz/@Profpatsch)';
// Helper function to convert a hex string to a Buffer
function hexToBytes(hex: string): Buffer {
return Buffer.from(hex, 'hex');
}
// Function to verify the nonce
function verifyNonce(result: Buffer, target: Buffer): boolean {
if (result.length !== target.length) {
return false;
}
for (let i = 0; i < result.length - 1; i++) {
if (result[i] > target[i]) {
return false;
} else if (result[i] < target[i]) {
break;
}
}
return true;
}
// Function to solve the challenge
function solveChallenge(prefix: string, targetHex: string): string {
let nonce = 0;
let hashed: Buffer;
const target = hexToBytes(targetHex);
while (true) {
const input = `${prefix}${nonce}`;
hashed = crypto.createHash('sha256').update(input).digest();
if (verifyNonce(hashed, target)) {
break;
} else {
nonce += 1;
}
}
return nonce.toString();
}
async function getUploadNonce() {
try {
const response = await fetch('https://lrclib.net/api/request-challenge', {
method: 'POST',
headers: {
'Content-Type': 'application/json',
'User-Agent': USER_AGENT,
'Lrclib-Client': USER_AGENT,
},
});
if (!response.ok) {
throw new Error(`HTTP error! Status: ${response.status}`);
}
const challengeData = (await response.json()) as { prefix: string; target: string };
return {
prefix: challengeData.prefix,
nonce: solveChallenge(challengeData.prefix, challengeData.target),
};
} catch (error) {
console.error('Error fetching the challenge:', error);
}
}
// Interface for the request body
/**
* Represents a request to publish a track with its associated information.
*/
export interface PublishRequest {
trackName: string;
artistName: string;
albumName: string;
/** In seconds? Milliseconds? mm:ss? */
duration: number;
plainLyrics: string;
syncedLyrics: string;
}
// Function to publish lyrics using the solved challenge
export async function publishLyrics(
requestBody: PublishRequest,
): Promise<true | undefined> {
const challenge = await getUploadNonce();
if (!challenge) {
return;
}
const publishToken = `${challenge.prefix}:${challenge.nonce}`;
const response = await fetch('https://lrclib.net/api/publish', {
method: 'POST',
headers: {
'Content-Type': 'application/json',
'User-Agent': USER_AGENT,
'Lrclib-Client': USER_AGENT,
'X-Publish-Token': publishToken,
},
body: JSON.stringify(requestBody),
});
if (response.status === 201) {
console.log('Lyrics successfully published.');
return true;
} else {
const errorResponse = (await response.json()) as { [key: string]: string };
console.error('Failed to publish lyrics:', errorResponse);
return;
}
}
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