react-qrcode-pix/dist/module/PIX.class.js

Objetivo deste pacote é a de facilitar o recebimento de pagamentos com PIX em aplicações React

export default class PIX {
    constructor({ pixkey, merchant, city, cep, code, amount, ignoreErrors = false }) {
        if (!ignoreErrors) {
            if (!pixkey || !merchant || !city)
                throw new Error('As propriedades: pixkey (chave pix), merchant (nome do recebedor) e city (cidade do recebedor), são obigatórios!');
            if (!PIX.verifyPixKey(pixkey))
                throw new Error(`A chave PIX (pixkey) '${pixkey}' parece ser inválida! Exemplos de formatos válidos: EMAIL: fulano_da_silva.recebedor@example.com | CPF: 12345678900 | CNPJ: 00038166000105 | TELEFONE: +5561912345678 | ALEATORIA: 123e4567-e12b-12d1-a456-426655440000`);
            if (typeof amount === 'number' && amount <= 0)
                throw new Error('A propriedade amount deve receber um valor numérico maior que zero ou nulo!');
        }
        this._props = {
            pixkey: pixkey.replace(/\s/gim, '').substring(0, 77),
            merchant: PIX.removeAccent(merchant, /[^a-z\s]/gim).substring(0, 80),
            city: PIX.removeAccent(city, /[^a-z\s]/gim).substring(0, 80),
            cep: cep ? cep.replace(/[^0-9]/gim, '').substring(0, 8) : null,
            code: PIX.removeAccent(code || '', /[^a-z0-9]/gim).substring(0, 25).toUpperCase() || '***',
            amount: amount && amount > 0 ? amount : null,
            ignoreErrors
        };
    }
    static padder(subject, lenght = 2) {
        const target = subject.toString();
        let complement = '';
        if (target.length > lenght) {
            throw new Error(`O comprimento de '${subject}' é maior que ${lenght}`);
        }
        for (let c = 0; c < lenght; c++) {
            complement += '0';
        }
        return (complement + target).slice(target.length);
    }
    static EVM(ID, content) {
        if (ID > 99)
            throw new Error('O ID do EVM pode ter no máximo duas casas decimais!');
        if (content.length > 99)
            throw new Error('O conteúdo do EVM pode ter no máximo noventa e nove caracters e espacos!');
        return PIX.padder(ID) + PIX.padder(content.length) + content;
    }
    static removeAccent(subject, extra_filter = /[^\w\s]/gim) {
        return !!String.prototype.normalize ? subject.normalize("NFD").replace(/[\u0300-\u036f]/g, '').replace(extra_filter, '') : subject.replace(extra_filter, '');
    }
    static CRC16(subject) {
        let result = 0xFFFF;
        if (subject.length > 0) {
            for (let offset = 0; offset < subject.length; offset++) {
                result ^= subject.charCodeAt(offset) << 8;
                for (let bitwise = 0; bitwise < 8; bitwise++) {
                    if ((result <<= 1) & 0x10000)
                        result ^= 0x1021;
                    result &= 0xFFFF;
                }
            }
        }
        return result.toString(16).toUpperCase();
    }
    static verifyPixKey(pixkey) {
        return (/^[^\s@]+@[^\s@]+\.[^\s@]+$/is.test(pixkey) ||
            /^[0-9]{11}$/is.test(pixkey) ||
            /^[0-9]{14}$/is.test(pixkey) ||
            /^\+[0-9]{12,13}$/is.test(pixkey) ||
            /^[\w-]{32,36}$/is.test(pixkey));
    }
    get(prop) {
        return this._props[prop];
    }
    getPayloadFormat() {
        return PIX.EVM(0, PIX.constants.PAYLOAD_FORMAT);
    }
    getMerchantAccount() {
        const gui = PIX.EVM(0, PIX.constants.MERCHANT_ACCOUNT_GUI);
        const key = PIX.EVM(1, this._props.pixkey);
        return PIX.EVM(26, gui + key);
    }
    getMerchantCategory() {
        return PIX.EVM(52, PIX.constants.MERCHANT_CATEGORY_CODE);
    }
    getTransactionCurrency() {
        return PIX.EVM(53, PIX.constants.TRANSACTION_CURRENCY);
    }
    getTransactionAmount() {
        return this._props.amount ? PIX.EVM(54, this._props.amount.toFixed(2)) : '';
    }
    getCountryCode() {
        return PIX.EVM(58, PIX.constants.COUNTRY_CODE);
    }
    getMerchantName() {
        return PIX.EVM(59, this._props.merchant);
    }
    getMerchantCity() {
        return PIX.EVM(60, this._props.city);
    }
    getMerchantCep() {
        return this._props.cep && /^[0-9]{8}$/.test(this._props.cep)
            ? PIX.EVM(61, this._props.cep)
            : '';
    }
    getAdditionalData() {
        const label = PIX.EVM(5, this._props.code);
        return PIX.EVM(62, label);
    }
    getInitCRC16() {
        return '63' + PIX.padder(PIX.constants.CRC16_LENGTH);
    }
    payload() {
        const payload = [
            this.getPayloadFormat(),
            this.getMerchantAccount(),
            this.getMerchantCategory(),
            this.getTransactionCurrency(),
            this.getTransactionAmount(),
            this.getCountryCode(),
            this.getMerchantName(),
            this.getMerchantCity(),
            this.getMerchantCep(),
            this.getAdditionalData(),
            this.getInitCRC16()
        ].join('');
        return payload + PIX.padder(PIX.CRC16(payload), PIX.constants.CRC16_LENGTH);
    }
    toString() {
        return this.payload();
    }
}
PIX.constants = {
    PAYLOAD_FORMAT: '01',
    MERCHANT_ACCOUNT_GUI: 'BR.GOV.BCB.PIX',
    MERCHANT_CATEGORY_CODE: '0000',
    TRANSACTION_CURRENCY: '986',
    COUNTRY_CODE: 'BR',
    CRC16_LENGTH: 4
};