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• [DIR] ..
• [FILE] Address.js
• [FILE] AdnlAddress.js
• [FILE] README.md
• [FILE] StorageBagId.js
• [FILE] Utils.js
• [FILE] index.js

Просмотр файла: Address.js

const {crc16, hexToBytes, bytesToHex, stringToBytes, base64toString, stringToBase64} = require("./Utils");

const bounceable_tag = 0x11;
const non_bounceable_tag = 0x51;
const test_flag = 0x80;

/**
 * @private
 * @param addressString {string}
 * @return {{isTestOnly: boolean, workchain: number, hashPart: Uint8Array, isBounceable: boolean}}
 */
function parseFriendlyAddress(addressString) {
    if (addressString.length !== 48) {
        throw new Error(`User-friendly address should contain strictly 48 characters`);
    }
    const data = stringToBytes(base64toString(addressString));
    if (data.length !== 36) { // 1byte tag + 1byte workchain + 32 bytes hash + 2 byte crc
        throw "Unknown address type: byte length is not equal to 36";
    }
    const addr = data.slice(0, 34);
    const crc = data.slice(34, 36);
    const calcedCrc = crc16(addr);
    if (!(calcedCrc[0] === crc[0] && calcedCrc[1] === crc[1])) {
        throw "Wrong crc16 hashsum";
    }
    let tag = addr[0];
    let isTestOnly = false;
    let isBounceable = false;
    if (tag & test_flag) {
        isTestOnly = true;
        tag = tag ^ test_flag;
    }
    if ((tag !== bounceable_tag) && (tag !== non_bounceable_tag))
        throw "Unknown address tag";

    isBounceable = tag === bounceable_tag;

    let workchain = null;
    if (addr[1] === 0xff) { // TODO we should read signed integer here
        workchain = -1;
    } else {
        workchain = addr[1];
    }
    if (workchain !== 0 && workchain !== -1) throw new Error('Invalid address wc ' + workchain);

    const hashPart = addr.slice(2, 34);
    return {isTestOnly, isBounceable, workchain, hashPart};
}

class Address {
    /**
     * @param anyForm {string | Address}
     */
    static isValid(anyForm) {
        try {
            new Address(anyForm);
            return true;
        } catch (e) {
            return false;
        }
    }

    /**
     * @param anyForm {string | Address}
     */
    constructor(anyForm) {
        if (anyForm == null) {
            throw "Invalid address";
        }

        if (anyForm instanceof Address) {
            this.wc = anyForm.wc;
            this.hashPart = anyForm.hashPart;
            this.isTestOnly = anyForm.isTestOnly;
            this.isUserFriendly = anyForm.isUserFriendly;
            this.isBounceable = anyForm.isBounceable;
            this.isUrlSafe = anyForm.isUrlSafe;
            return;
        }

        if (anyForm.search(/\-/) > 0 || anyForm.search(/_/) > 0) {
            this.isUrlSafe = true;
            anyForm = anyForm.replace(/\-/g, '+').replace(/_/g, '\/');
        } else {
            this.isUrlSafe = false;
        }
        if (anyForm.indexOf(':') > -1) {
            const arr = anyForm.split(':');
            if (arr.length !== 2) throw new Error('Invalid address ' + anyForm);
            const wc = parseInt(arr[0]);
            if (wc !== 0 && wc !== -1) throw new Error('Invalid address wc ' + anyForm);
            const hex = arr[1];
            if (hex.length !== 64) throw new Error('Invalid address hex ' + anyForm);
            this.isUserFriendly = false;
            this.wc = wc;
            this.hashPart = hexToBytes(hex);
            this.isTestOnly = false;
            this.isBounceable = false;
        } else {
            this.isUserFriendly = true;
            const parseResult = parseFriendlyAddress(anyForm);
            this.wc = parseResult.workchain;
            this.hashPart = parseResult.hashPart;
            this.isTestOnly = parseResult.isTestOnly;
            this.isBounceable = parseResult.isBounceable;
        }
    }

    /**
     * @param isUserFriendly? {boolean}
     * @param isUrlSafe? {boolean}
     * @param isBounceable? {boolean}
     * @param isTestOnly? {boolean}
     * @return {string}
     */
    toString(isUserFriendly,
             isUrlSafe,
             isBounceable,
             isTestOnly) {

        if (isUserFriendly === undefined) isUserFriendly = this.isUserFriendly;
        if (isUrlSafe === undefined) isUrlSafe = this.isUrlSafe;
        if (isBounceable === undefined) isBounceable = this.isBounceable;
        if (isTestOnly === undefined) isTestOnly = this.isTestOnly;

        if (!isUserFriendly) {
            return this.wc + ":" + bytesToHex(this.hashPart);
        } else {
            let tag = isBounceable ? bounceable_tag : non_bounceable_tag;
            if (isTestOnly) {
                tag |= test_flag;
            }

            const addr = new Int8Array(34);
            addr[0] = tag;
            addr[1] = this.wc;
            addr.set(this.hashPart, 2);

            const addressWithChecksum = new Uint8Array(36);
            addressWithChecksum.set(addr);
            addressWithChecksum.set(crc16(addr), 34);
            let addressBase64 = stringToBase64(String.fromCharCode.apply(null, new Uint8Array(addressWithChecksum)));

            if (isUrlSafe) {
                addressBase64 = addressBase64.replace(/\+/g, '-').replace(/\//g, '_');
            }
            return addressBase64;
        }
    }
}

module.exports.default = Address;

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