ecash-lib/dist/token/empp.js

Library for eCash transaction building

"use strict";
// Copyright (c) 2024 The Bitcoin developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
Object.defineProperty(exports, "__esModule", { value: true });
exports.parseEmppScript = exports.emppScript = void 0;
const op_js_1 = require("../op.js");
const opcode_js_1 = require("../opcode.js");
const script_js_1 = require("../script.js");
/** Build an eMPP OP_RETURN script with the given pushdata */
function emppScript(pushdata) {
    if (pushdata.find(pushdata => pushdata.length == 0) !== undefined) {
        throw new Error('Pushdata cannot be empty');
    }
    return script_js_1.Script.fromOps([
        opcode_js_1.OP_RETURN,
        opcode_js_1.OP_RESERVED,
        ...pushdata.map(pushdataOpEmpp),
    ]);
}
exports.emppScript = emppScript;
function pushdataOpEmpp(pushdata) {
    if (pushdata.length < opcode_js_1.OP_PUSHDATA1) {
        return {
            opcode: pushdata.length,
            data: pushdata,
        };
    }
    return (0, op_js_1.pushBytesOp)(pushdata);
}
/**
 * Parse a script for EMPP push(es)
 *
 * EMPP may encode multiple pushdatas in a single OP_RETURN script
 *
 * input script is a valid EMPP OP_RETURN    => returns an array of EMPP pushdata(s)
 * input script is not an EMPP OP_RETURN     => returns undefined
 * input script is an invalid EMPP OP_RETURN => throws
 */
function parseEmppScript(script) {
    const ops = script.ops();
    const opreturnOp = ops.next();
    if (opreturnOp === undefined ||
        (0, op_js_1.isPushOp)(opreturnOp) ||
        opreturnOp !== opcode_js_1.OP_RETURN) {
        return undefined;
    }
    const opreservedOp = ops.next();
    if (opreservedOp === undefined ||
        (0, op_js_1.isPushOp)(opreservedOp) ||
        opreservedOp !== opcode_js_1.OP_RESERVED) {
        return undefined;
    }
    const pushdata = [];
    let op = undefined;
    while ((op = ops.next()) !== undefined) {
        if (!(0, op_js_1.isPushOp)(op)) {
            throw new Error('eMPP allows only push ops');
        }
        if (op.data.length === 0) {
            throw new Error("eMPP doesn't allow empty pushdata");
        }
        pushdata.push(op.data);
    }
    return pushdata;
}
exports.parseEmppScript = parseEmppScript;
//# sourceMappingURL=empp.js.map