@wuwei-labs/srsly/dist/cjs/pda/lookupTable.js

TypeScript SDK for SRSLY

"use strict";
/**
 * Address Lookup Table (ALT) derivation utilities
 * @module pda/lookupTable
 */
Object.defineProperty(exports, "__esModule", { value: true });
exports.deriveLookupTable = deriveLookupTable;
const kit_1 = require("@solana/kit");
const signer_1 = require("../utils/signer");
/**
 * Address Lookup Table program address
 */
const ALT_PROGRAM = 'AddressLookupTab1e1111111111111111111111111';
const addressEncoder = (0, kit_1.getAddressEncoder)();
/**
 * Convert a BigInt or number slot to little-endian bytes (u64)
 */
function slotToBytes(slot) {
    const buffer = new ArrayBuffer(8);
    const view = new DataView(buffer);
    view.setBigUint64(0, BigInt(slot), true); // little-endian
    return new Uint8Array(buffer);
}
/**
 * Derive an Address Lookup Table (ALT) address
 *
 * ALT addresses are deterministically derived from an authority and a recent slot.
 * The slot is typically obtained from getSlot() RPC call.
 *
 * @param authority - The authority that will own the lookup table
 * @param recentSlot - A recent slot number (from getSlot RPC)
 * @param altProgramAddress - Optional ALT program address (defaults to mainnet)
 * @returns The derived lookup table address
 *
 * @example
 * ```typescript
 * import { deriveLookupTable } from './lookupTable';
 *
 * // Get recent slot from RPC
 * const slot = await rpc.getSlot().send();
 *
 * // Derive the lookup table address
 * const lookupTable = await deriveLookupTable(authorityAddress, slot);
 * ```
 */
async function deriveLookupTable(authority, recentSlot, altProgramAddress) {
    const authorityAddress = (0, signer_1.getSignerAddress)(authority);
    const altProgram = altProgramAddress ? (0, signer_1.getSignerAddress)(altProgramAddress) : (0, kit_1.address)(ALT_PROGRAM);
    // Encode authority and slot to bytes
    const authorityBytes = addressEncoder.encode(authorityAddress);
    const slotBytes = slotToBytes(recentSlot);
    const [pda] = await (0, kit_1.getProgramDerivedAddress)({
        programAddress: altProgram,
        seeds: [authorityBytes, slotBytes],
    });
    return pda;
}
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