charms-js/dist/decoder.js

TypeScript SDK for decoding Bitcoin transactions containing Charms data

"use strict";
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    var desc = Object.getOwnPropertyDescriptor(m, k);
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      desc = { enumerable: true, get: function() { return m[k]; } };
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    Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
    Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
    o["default"] = v;
});
var __importStar = (this && this.__importStar) || (function () {
    var ownKeys = function(o) {
        ownKeys = Object.getOwnPropertyNames || function (o) {
            var ar = [];
            for (var k in o) if (Object.prototype.hasOwnProperty.call(o, k)) ar[ar.length] = k;
            return ar;
        };
        return ownKeys(o);
    };
    return function (mod) {
        if (mod && mod.__esModule) return mod;
        var result = {};
        if (mod != null) for (var k = ownKeys(mod), i = 0; i < k.length; i++) if (k[i] !== "default") __createBinding(result, mod, k[i]);
        __setModuleDefault(result, mod);
        return result;
    };
})();
Object.defineProperty(exports, "__esModule", { value: true });
exports.decodeCbor = decodeCbor;
exports.denormalizeSpell = denormalizeSpell;
const cbor = __importStar(require("cbor"));
// Converts CBOR Maps to plain objects recursively
function convertMapsToObjects(obj) {
    if (obj instanceof Map) {
        const result = {};
        for (const [key, value] of obj.entries()) {
            result[key] = convertMapsToObjects(value);
        }
        return result;
    }
    else if (Array.isArray(obj)) {
        return obj.map(item => convertMapsToObjects(item));
    }
    else if (obj && typeof obj === 'object') {
        const result = {};
        for (const [key, value] of Object.entries(obj)) {
            result[key] = convertMapsToObjects(value);
        }
        return result;
    }
    return obj;
}
// Decodes CBOR data from Bitcoin transaction
function decodeCbor(cborData) {
    try {
        if (!cborData || cborData.length === 0) {
            return null;
        }
        const rawDecoded = cbor.decode(cborData);
        const decoded = convertMapsToObjects(rawDecoded);
        console.log('Parsing spell data:', JSON.stringify(decoded, null, 2).substring(0, 200) + '...');
        // CBOR structure: [NormalizedSpell, Proof]
        if (!Array.isArray(decoded) || decoded.length < 2) {
            console.log('Invalid CBOR structure: expected [spell, proof] array');
            return null;
        }
        const normalizedSpell = decoded[0];
        // Validate spell structure
        if (normalizedSpell &&
            typeof normalizedSpell === 'object' &&
            'version' in normalizedSpell &&
            'tx' in normalizedSpell &&
            'app_public_inputs' in normalizedSpell) {
            return normalizedSpell;
        }
        console.log('Invalid spell structure in CBOR data');
        return null;
    }
    catch (error) {
        console.log(`Error in decodeCbor: ${error.message}`);
        return null;
    }
}
// Converts NormalizedSpell to ParsedCharmData format
function denormalizeSpell(normalizedSpell) {
    // Convert app_public_inputs to $xxxx indexed format
    const apps = {};
    const appKeys = Object.keys(normalizedSpell.app_public_inputs);
    appKeys.forEach((appKey, index) => {
        const indexKey = `$${String(index).padStart(4, '0')}`;
        apps[indexKey] = normalizedSpell.app_public_inputs[appKey];
    });
    const ins = normalizedSpell.tx.ins || [];
    // Extract charms from outputs
    const outs = normalizedSpell.tx.outs.map((normalizedCharms) => {
        const output = {};
        if (Object.keys(normalizedCharms).length > 0) {
            const charms = {};
            // Convert numeric indices to $xxxx format
            Object.entries(normalizedCharms).forEach(([appIndexStr, charmData]) => {
                const appIndex = parseInt(appIndexStr);
                const indexKey = `$${String(appIndex).padStart(4, '0')}`;
                // Preserve original CBOR structure
                if (charmData && typeof charmData === 'object' && 'value' in charmData) {
                    charms[indexKey] = charmData.value;
                }
                else {
                    charms[indexKey] = charmData;
                }
            });
            if (Object.keys(charms).length > 0) {
                output.charms = charms;
            }
        }
        return output;
    });
    return {
        version: normalizedSpell.version,
        apps,
        ins: ins.map(utxoId => ({ utxo_id: utxoId })),
        outs
    };
}