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frete.js
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frete.js
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'use strict';
const path = require('path');
const soap = require('soap');
const V = require('argument-validator');
const util = require('util');
// on file system to improve perf.
const SOAP_WSDL = path.resolve(__dirname, 'correios-data/CalcPrecoPrazo.xml');
const servicesArray = require('./correios-data/listaServicos.json');
function extend (target /* , objs... */) {
V.objectOrEmpty(target, 'target');
for (let i = 1; i < arguments.length; ++i) {
let obj = arguments[i];
V.objectOrEmpty(obj, 'object in argument position: ' + i);
for (let key in obj) {
target[key] = obj[key];
}
}
return target;
}
function frete (opts) {
opts = opts || {};
V.objectOrEmpty(opts, 'options');
return new Frete(extend({}, defaultOptions, opts));
}
frete.formatos = {
caixaPacote: 1,
roloPrisma: 2,
envelope: 3
};
// just some of the most used services, if you are using a service too much
// consider adding it here
frete.servicos = {
sedex: '04014',
sedexCobrar: '04065',
pac: '04510',
pacCobrar: '04707',
sedex10: '40215',
sedex12: '40169',
sedexHoje: '40290',
};
frete.codigos = frete.servicos;
frete.servicos.list = servicesArray;
frete.servicos.byCode = servicesArray.reduce((acc, curr) => {
acc[curr.codigo] = curr;
return acc;
}, {});
frete.servicos.names = servicesArray.reduce((acc, curr) => {
acc[curr.codigo] = curr.descricao;
return acc;
}, {});
frete.servicos.search = (text) => {
V.string(text, 'text');
return frete.servicos.list.filter((s) =>
s.descricao.toLowerCase().includes(text.toLowerCase()));
};
frete.maoPropria = {
sim: 'S',
nao: 'N'
};
frete.avisoRecebimento = {
sim: 'S',
nao: 'N'
};
const defaultOptions = {
sCepOrigem: '',
sCdMaoPropria: frete.maoPropria.nao,
sCdAvisoRecebimento: frete.avisoRecebimento.nao,
sDsSenha: '',
nCdEmpresa: '',
nCdServico: ''
};
const allOptions = [
'sCepOrigem',
'sCepDestino',
'sCdMaoPropria',
'sCdAvisoRecebimento',
'sDsSenha',
'nCdEmpresa',
'nCdServico',
'nVlValorDeclarado',
'nVlPeso',
'nCdFormato',
'nVlComprimento',
'nVlAltura',
'nVlLargura',
'nVlDiametro',
'nVlValorDeclarado',
'sDtCalculo',
'strDataCalculo'
];
for (const propertyName of allOptions) {
const setterName = getSetterName(propertyName);
const proto = Frete.prototype;
frete[propertyName] = frete[setterName] = function (value) {
defaultOptions[propertyName] = value;
return this;
};
proto[propertyName] = proto[setterName] = function (value) {
this.options[propertyName] = value;
return this;
};
}
frete.defaultOptions = defaultOptions;
function Frete (opts) {
V.object(opts, 'opts');
this.options = opts;
for (const key in this.options) {
const value = this.options[key];
if (!V.isFunction(this[key])) {
continue;
}
if (V.isString(value) || V.isNumber(value) || V.isArray(value)) {
this[key](value);
}
}
}
const apiMethods = {
prazo: {
correiosMethodName: 'CalcPrazo',
required: [ ]
},
prazoData: {
correiosMethodName: 'CalcPrazoData',
required: [ 'sDtCalculo' ]
},
preco: {
correiosMethodName: 'CalcPreco',
required: [
'nVlPeso',
'nCdFormato',
'nVlComprimento',
'nVlAltura',
'nVlLargura',
'nVlDiametro',
'sCdMaoPropria',
'nVlValorDeclarado',
'sCdAvisoRecebimento'
]
},
precoData: {
correiosMethodName: 'CalcPrecoData',
required: [
'nVlPeso',
'nCdFormato',
'nVlComprimento',
'nVlAltura',
'nVlLargura',
'nVlDiametro',
'sCdMaoPropria',
'nVlValorDeclarado',
'sCdAvisoRecebimento',
'sDtCalculo'
]
},
precoFac: {
correiosMethodName: 'CalcPrecoFAC',
required: [
'nVlPeso',
'strDataCalculo'
]
},
precoPrazo: {
correiosMethodName: 'CalcPrecoPrazo',
required: [
'nVlPeso',
'nCdFormato',
'nVlComprimento',
'nVlAltura',
'nVlLargura',
'nVlDiametro',
'sCdMaoPropria',
'nVlValorDeclarado',
'sCdAvisoRecebimento'
]
},
precoPrazoData: {
correiosMethodName: 'CalcPrecoPrazoData',
required: [
'nVlPeso',
'nCdFormato',
'nVlComprimento',
'nVlAltura',
'nVlLargura',
'nVlDiametro',
'sCdMaoPropria',
'nVlValorDeclarado',
'sCdAvisoRecebimento',
'sDtCalculo'
]
},
precoPrazoRestricao: {
correiosMethodName: 'CalcPrecoPrazoRestricao',
required: [
'nVlPeso',
'nCdFormato',
'nVlComprimento',
'nVlAltura',
'nVlLargura',
'nVlDiametro',
'sCdMaoPropria',
'nVlValorDeclarado',
'sCdAvisoRecebimento',
'sDtCalculo'
]
},
listaServicos: {
correiosMethodName: 'ListaServicos'
},
listaServicosStar: {
correiosMethodName: 'ListaServicosSTAR'
},
verificaModal: {
correiosMethodName: 'VerificaModal',
required: []
}
};
for (const methodName in apiMethods) {
const api = apiMethods[methodName];
defineFreteApiMethod(methodName, api.correiosMethodName);
}
function defineFreteApiMethod (methodName, correiosMethodName) {
V.string(methodName, 'methodName');
V.string(correiosMethodName, 'correiosMethodName');
Frete.prototype[methodName] = function (cep, optsOrCallback, callback) {
var opts = optsOrCallback;
if (V.isFunction(cep) && arguments.length === 1) {
callback = cep;
opts = {};
}
if (V.isFunction(optsOrCallback) && !callback) {
callback = optsOrCallback;
opts = {};
}
if (!optsOrCallback && !callback) {
const fn = this[methodName].bind(this, cep, optsOrCallback || {});
return util.promisify(fn)();
}
V.objectOrEmpty(opts, 'options');
opts = extend({}, this.options, opts);
if (opts.cep || opts.cepDestino || opts.sCepDestino) {
cep = opts.cep || opts.cepDestino || opts.sCepDestino;
}
V.function(callback, 'callback');
if (V.isString(cep)) {
opts.sCepDestino = cep;
}
if (V.isArray(opts.nCdServico)) {
opts.nCdServico = opts.nCdServico.join(',');
}
// special case, can be a number
if (V.isNumber(opts.nCdServico)) {
opts.nCdServico = String(opts.nCdServico);
}
const errors = getValidationErrors(methodName, opts);
if (errors.length > 0) {
const err = new Error("Validation error:\n" + errors.join("\n"));
return callback(err);
}
doRequest(correiosMethodName, opts, callback);
};
}
function execute (methodName, opts, callback) {
V.string(methodName, 'methodName');
V.object(opts, 'opts');
soap.createClient(SOAP_WSDL, function (err, client) {
if (err) return callback(err);
client[methodName](opts, callback);
});
}
function decorateServices (services) {
for (const service of services) {
for (const key in service) {
const value = service[key];
delete service[key];
const keyCamelCase = key[0].toLowerCase() + '' + key.substring(1);
service[keyCamelCase] = value;
}
service.name = frete.servicos.names[String(service.codigo).padStart(5, '0')];
}
return services;
}
function getErrorsFromServices (services) {
const errors = [];
for (const service of services) {
if (service.MsgErro && !errors.includes(service.MsgErro)) {
errors.push(`${service.MsgErro} ${service.Erro || ''}`.trim());
}
}
return errors;
}
const resultParsers = {
ListaServicos(body) { return body.ServicosCalculo.cServicosCalculo; },
ListaServicosSTAR(body) { return body.ServicosCalculo.cServicosCalculo; },
VerificaModal(body) { return body.ServicosModal.cModal; }
};
function doRequest(methodName, opts, callback) {
V.string(methodName, 'methodName');
V.object(opts, 'opts');
V.function(callback, 'callback');
const resultNode = methodName + "Result";
execute(methodName, opts, function (err, res, body) {
if (err) return callback(err, res, body);
if (res[resultNode] && res[resultNode].Servicos) {
var services = res[resultNode].Servicos.cServico;
if (!services || !V.isArray(services)) {
return callback("Unknown response. cServico not found.", res, body);
}
const errors = getErrorsFromServices(services);
if (errors.length > 0) {
const err = new Error(methodName + ":\n" + errors.join("\n"));
return callback(err, res, body);
}
return callback(null, decorateServices(services));
}
if (res[resultNode] && resultParsers[methodName]) {
try {
const parser = resultParsers[methodName];
return callback(null, parser(res[resultNode]));
} catch (ex) {
return callback("Unknown response", res, body);
}
}
return callback("Unknown response", res, body);
});
}
function getValidationErrors (methodName, options) {
V.string(methodName, 'methodName');
V.object(options, 'options');
const api = apiMethods[methodName];
if (!api) {
throw new Error("Invalid method name: " + methodName);
}
const requiredFields = api.required ?
api.required.concat(['nCdServico', 'sCepOrigem', 'sCepDestino']) : [];
const errors = [];
for (const fieldName of requiredFields) {
// special case for cdServico since its a string but starts with n
// and accepts more numbers with ,
const isString = fieldName == 'nCdServico' || fieldName[0] === 's';
const isNumber = fieldName != 'nCdServico' && fieldName[0] === 'n';
const value = options[fieldName];
if ((isString && !V.isString(value)) || (isNumber && !V.isNumber(value))) {
let msg = `Required option: ${fieldName} has invalid value: ${value}`;
msg += `\nExpected a valid: ${(isString ? 'string' : 'number')}`;
errors.push(msg);
}
}
if (V.isArray(options.nCdServico) && options.nCdServico.length > 1) {
errors.push('Máximo de 1 código de serviço por consulta.');
}
return errors;
}
function getSetterName (propertyName) {
V.string(propertyName, 'property name');
// special case for DataCalculo
let prettyNameMethod;
if (propertyName === 'strDataCalculo') {
prettyNameMethod = 'dataCalculo';
} else {
// first, remove the s/n of initial
prettyNameMethod = propertyName.substring(1);
// after that remove the prefix Cd (code) and Vl(value) of argument
prettyNameMethod = prettyNameMethod.replace('Cd', '');
prettyNameMethod = prettyNameMethod.replace('Vl', '');
// now we need to set the first letter to lowerCase(), just to be cool
const firstLetter = prettyNameMethod[0].toLowerCase();
prettyNameMethod = firstLetter + prettyNameMethod.substring(1);
}
return prettyNameMethod;
}
module.exports = frete;