@bit-gpt/h402/dist/shared/enrichPaymentRequirements.js

BitGPT's 402 open protocol for blockchain-native payments

import { getTokenDecimals as getSolanaTokenDecimals, getTokenSymbol as getSolanaTokenSymbol, } from "./solana/tokenMetadata.js";
import { getTokenDecimals as getEvmTokenDecimals, getTokenSymbol as getEvmTokenSymbol, } from "./evm/tokenMetadata.js";
/**
 * Enrich payment requirements with token metadata (decimals and symbol)
 * This is used by the middleware before redirecting to the paywall
 */
export async function enrichPaymentRequirements(requirements) {
    return Promise.all(requirements.map(async (req) => {
        // Skip if metadata is already present
        if (req.tokenDecimals !== undefined && req.tokenSymbol !== undefined) {
            return req;
        }
        // Handle different namespaces
        if (req.namespace === "solana") {
            // Get token metadata for Solana tokens
            const [decimals, symbol] = await Promise.all([
                getSolanaTokenDecimals(req.tokenAddress),
                getSolanaTokenSymbol(req.tokenAddress),
            ]);
            return {
                ...req,
                tokenDecimals: decimals,
                tokenSymbol: symbol || "UNKNOWN",
            };
        }
        else if (req.namespace === "evm") {
            // Get token metadata for EVM tokens
            const [decimals, symbol] = await Promise.all([
                getEvmTokenDecimals(req.tokenAddress),
                getEvmTokenSymbol(req.tokenAddress),
            ]);
            return {
                ...req,
                tokenDecimals: decimals,
                tokenSymbol: symbol || "UNKNOWN",
            };
        }
        // Return unchanged for unknown namespaces
        return req;
    }));
}
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