solana-token-extension-boost/dist/extensions/interest-bearing/index.js

SDK for Solana Token Extensions with wallet adapter support

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.InterestBearingExtension = void 0;
const spl_token_1 = require("@solana/spl-token");
/**
 * Class for Interest-Bearing token functionality
 */
class InterestBearingExtension {
    /**
     * Create instruction to initialize Interest-Bearing for mint
     * @param mint - Mint address
     * @param rateAuthority - Authority address that can change interest rate
     * @param rate - Interest rate (basis points, 10000 = 100%)
     * @param programId - Token Extension Program ID
     * @returns Instruction to initialize Interest-Bearing
     */
    static createInitializeInterestBearingMintInstruction(mint, rateAuthority, rate, programId = spl_token_1.TOKEN_2022_PROGRAM_ID) {
        return (0, spl_token_1.createInitializeInterestBearingMintInstruction)(mint, rateAuthority, rate, programId);
    }
    /**
     * Create instruction to update interest rate
     * @param mint - Mint address
     * @param rateAuthority - Authority address that can change interest rate
     * @param rate - New interest rate (basis points, 10000 = 100%)
     * @param programId - Token Extension Program ID
     * @returns Instruction to update interest rate
     */
    static createUpdateRateInterestBearingMintInstruction(mint, rateAuthority, rate, programId = spl_token_1.TOKEN_2022_PROGRAM_ID) {
        // In practice, you would call a function from @solana/spl-token
        // This is a simulated version for demo purposes
        return {
            programId,
            keys: [
                { pubkey: mint, isSigner: false, isWritable: true },
                { pubkey: rateAuthority, isSigner: true, isWritable: false },
            ],
            data: Buffer.from([0x20, ...new Uint8Array(new Uint16Array([rate]).buffer)]), // Mock data
        };
    }
    /**
     * Calculate current token amount including interest
     * @param initialAmount - Initial amount
     * @param rate - Interest rate (basis points, 10000 = 100%)
     * @param timeInSeconds - Elapsed time (seconds)
     * @returns Current token amount including interest
     */
    static calculateInterest(initialAmount, rate, timeInSeconds) {
        // Interest calculation formula:
        // amount * (1 + rate/10000) ^ (timeInSeconds / secondsInYear)
        const secondsInYear = 31536000; // 365 * 24 * 60 * 60
        // Convert rate from basis points to decimal
        const rateDecimal = rate / 10000;
        // Calculate years
        const years = timeInSeconds / secondsInYear;
        // Calculate interest factor
        const interestFactor = Math.pow(1 + rateDecimal, years);
        // Calculate current token amount
        return BigInt(Math.floor(Number(initialAmount) * interestFactor));
    }
}
exports.InterestBearingExtension = InterestBearingExtension;