@gorbchain-xyz/chaindecode/dist/src/utils/decodeMintAccount.js

GorbchainSDK V1.3+ - Complete Solana development toolkit with advanced cryptography, messaging, and collaboration features. Build secure applications with blockchain, DeFi, and end-to-end encryption.

import { bytesToBase58 } from './base58.js';
/**
 * Decodes a Mint account buffer according to the SPL Token program spec.
 * Returns a deeply nested, descriptive object for frontend and explorer use.
 * Also parses Metaplex Token Metadata extension if present.
 */
export function decodeMintAccount(input, opts) {
    let buf;
    if (typeof input === 'string') {
        if ((opts === null || opts === void 0 ? void 0 : opts.encoding) === 'base64') {
            buf = Uint8Array.from(atob(input), c => c.charCodeAt(0));
        }
        else if ((opts === null || opts === void 0 ? void 0 : opts.encoding) === 'hex') {
            buf = Uint8Array.from(input.match(/.{1,2}/g).map(byte => parseInt(byte, 16)));
        }
        else {
            throw new Error('Unsupported encoding or missing encoding option');
        }
    }
    else {
        buf = input;
    }
    const mintAuthorityOption = new DataView(buf.buffer, buf.byteOffset, buf.byteLength).getUint32(0, true);
    const mintAuthority = buf.slice(4, 36);
    const supply = BigInt(new DataView(buf.buffer, buf.byteOffset + 36, 8).getBigUint64(0, true)).toString();
    const decimals = buf[44];
    const isInitialized = buf[45] !== 0;
    const freezeAuthorityOption = new DataView(buf.buffer, buf.byteOffset + 46, 4).getUint32(0, true);
    const freezeAuthority = buf.slice(50, 82);
    // Parse Metaplex Token Metadata extension if present (Token-2022 TLV extension type 6)
    let metadata = undefined;
    if (buf.length > 82 && buf[82] === 6) {
        // TLV extension type 6: Token Metadata
        // const _length = buf[83] + (buf[84] << 8); // little-endian u16
        const metaStart = 86;
        const name = new TextDecoder().decode(buf.slice(metaStart, metaStart + 32)).replace(/\0+$/, '');
        const symbol = new TextDecoder().decode(buf.slice(metaStart + 32, metaStart + 44)).replace(/\0+$/, '');
        const uri = new TextDecoder().decode(buf.slice(metaStart + 44, metaStart + 200)).replace(/\0+$/, '');
        const updateAuthority = Buffer.from(buf.slice(metaStart + 200, metaStart + 232)).toString('hex');
        metadata = { name, symbol, uri, updateAuthority };
        // More fields can be parsed here for full Metaplex support
    }
    return {
        supply,
        decimals,
        isInitialized,
        mintAuthority: {
            option: mintAuthorityOption,
            address: bytesToBase58(mintAuthority),
            base58: bytesToBase58(mintAuthority)
        },
        freezeAuthority: {
            option: freezeAuthorityOption,
            address: bytesToBase58(freezeAuthority),
            base58: bytesToBase58(freezeAuthority)
        },
        raw: Array.from(buf).map(x => x.toString(16).padStart(2, '0')).join(''),
        metadata
    };
}