Java tutorial
/* * Copyright 2010 BigData.mx * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package mx.bigdata.sat.cfdi; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.InputStream; import java.io.OutputStream; import java.io.PrintStream; import java.math.BigInteger; import java.security.PrivateKey; import java.security.Signature; import java.security.cert.X509Certificate; import java.util.List; import java.util.Map; import javax.xml.XMLConstants; import javax.xml.bind.JAXBContext; import javax.xml.bind.Marshaller; import javax.xml.bind.Unmarshaller; import javax.xml.bind.util.JAXBSource; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.transform.Result; import javax.xml.transform.Transformer; import javax.xml.transform.Source; import javax.xml.transform.TransformerFactory; import javax.xml.transform.stream.StreamResult; import javax.xml.transform.stream.StreamSource; import javax.xml.validation.Schema; import javax.xml.validation.SchemaFactory; import javax.xml.validation.Validator; import mx.bigdata.sat.cfdi.schema.Comprobante; import mx.bigdata.sat.cfdi.schema.ObjectFactory; import mx.bigdata.sat.common.ComprobanteBase; import mx.bigdata.sat.common.NamespacePrefixMapperImpl; import mx.bigdata.sat.common.URIResolverImpl; import mx.bigdata.sat.security.KeyLoaderEnumeration; import mx.bigdata.sat.security.factory.KeyLoaderFactory; import org.apache.commons.codec.binary.Base64; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.xml.sax.ErrorHandler; import com.google.common.base.Joiner; import com.google.common.collect.Lists; import com.google.common.collect.ImmutableMap; import com.google.common.collect.Maps; public final class CFDv3 implements CFDI { private static final String XSLT = "/xslt/cadenaoriginal_3_0.xslt"; private static final String XSD = "/xsd/v3/cfdv3.xsd"; private static final String XSD_TFD = "/xsd/v3/TimbreFiscalDigital.xsd"; private static final String XML_HEADER = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"; private static final String BASE_CONTEXT = "mx.bigdata.sat.cfdi.schema"; private final static Joiner JOINER = Joiner.on(':'); private final JAXBContext context; public static final ImmutableMap<String, String> PREFIXES = ImmutableMap.of( "http://www.w3.org/2001/XMLSchema-instance", "xsi", "http://www.sat.gob.mx/cfd/3", "cfdi", "http://www.sat.gob.mx/TimbreFiscalDigital", "tfd"); private final Map<String, String> localPrefixes = Maps.newHashMap(PREFIXES); private TransformerFactory tf; final Comprobante document; public CFDv3(InputStream in, String... contexts) throws Exception { this.context = getContext(contexts); this.document = load(in); } public CFDv3(Comprobante comprobante, String... contexts) throws Exception { this.context = getContext(contexts); this.document = copy(comprobante); } public void addNamespace(String uri, String prefix) { localPrefixes.put(uri, prefix); } public void setTransformerFactory(TransformerFactory tf) { this.tf = tf; tf.setURIResolver(new URIResolverImpl()); } public void sellar(PrivateKey key, X509Certificate cert) throws Exception { cert.checkValidity(); String signature = getSignature(key); document.setSello(signature); byte[] bytes = cert.getEncoded(); Base64 b64 = new Base64(-1); String certStr = b64.encodeToString(bytes); document.setCertificado(certStr); BigInteger bi = cert.getSerialNumber(); document.setNoCertificado(new String(bi.toByteArray())); } public Comprobante sellarComprobante(PrivateKey key, X509Certificate cert) throws Exception { sellar(key, cert); return doGetComprobante(); } public void validar() throws Exception { validar(null); } public void validar(ErrorHandler handler) throws Exception { SchemaFactory sf = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI); Source[] schemas = new Source[] { new StreamSource(getClass().getResourceAsStream(XSD)), new StreamSource(getClass().getResourceAsStream(XSD_TFD)) }; Schema schema = sf.newSchema(schemas); Validator validator = schema.newValidator(); if (handler != null) { validator.setErrorHandler(handler); } validator.validate(new JAXBSource(context, document)); } public void verificar() throws Exception { String certStr = document.getCertificado(); Base64 b64 = new Base64(); byte[] cbs = b64.decode(certStr); X509Certificate cert = KeyLoaderFactory .createInstance(KeyLoaderEnumeration.PUBLIC_KEY_LOADER, new ByteArrayInputStream(cbs)).getKey(); String sigStr = document.getSello(); byte[] signature = b64.decode(sigStr); byte[] bytes = getOriginalBytes(); Signature sig = Signature.getInstance("SHA1withRSA"); sig.initVerify(cert); sig.update(bytes); boolean bool = sig.verify(signature); if (!bool) { throw new Exception("Invalid signature"); } } public void guardar(OutputStream out) throws Exception { Marshaller m = context.createMarshaller(); m.setProperty("com.sun.xml.bind.namespacePrefixMapper", new NamespacePrefixMapperImpl(localPrefixes)); m.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE); m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE); m.setProperty(Marshaller.JAXB_SCHEMA_LOCATION, "http://www.sat.gob.mx/cfd/3 " + "http://www.sat.gob.mx/sitio_internet/cfd/3/cfdv3.xsd"); byte[] xmlHeaderBytes = XML_HEADER.getBytes("UTF8"); out.write(xmlHeaderBytes); m.marshal(document, out); } public String getCadenaOriginal() throws Exception { byte[] bytes = getOriginalBytes(); return new String(bytes, "UTF8"); } public static Comprobante newComprobante(InputStream in) throws Exception { return load(in); } byte[] getOriginalBytes() throws Exception { JAXBSource in = new JAXBSource(context, document); ByteArrayOutputStream baos = new ByteArrayOutputStream(); Result out = new StreamResult(baos); TransformerFactory factory = tf; if (factory == null) { factory = TransformerFactory.newInstance(); factory.setURIResolver(new URIResolverImpl()); } Transformer transformer = factory.newTransformer(new StreamSource(getClass().getResourceAsStream(XSLT))); transformer.transform(in, out); return baos.toByteArray(); } String getSignature(PrivateKey key) throws Exception { byte[] bytes = getOriginalBytes(); Signature sig = Signature.getInstance("SHA1withRSA"); sig.initSign(key); sig.update(bytes); byte[] signed = sig.sign(); Base64 b64 = new Base64(-1); return b64.encodeToString(signed); } public ComprobanteBase getComprobante() throws Exception { return new CFDv3ComprobanteBase(doGetComprobante()); } Comprobante doGetComprobante() throws Exception { return copy(document); } // Defensive deep-copy private Comprobante copy(Comprobante comprobante) throws Exception { DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); dbf.setNamespaceAware(true); DocumentBuilder db = dbf.newDocumentBuilder(); Document doc = db.newDocument(); Marshaller m = context.createMarshaller(); m.marshal(comprobante, doc); Unmarshaller u = context.createUnmarshaller(); return (Comprobante) u.unmarshal(doc); } public static final class CFDv3ComprobanteBase implements ComprobanteBase { private final Comprobante document; public CFDv3ComprobanteBase(Comprobante document) { this.document = document; } public boolean hasComplemento() { return document.getComplemento() != null; } public List<Object> getComplementoGetAny() { return document.getComplemento().getAny(); } public String getSello() { return document.getSello(); } public void setComplemento(Element element) { ObjectFactory of = new ObjectFactory(); Comprobante.Complemento comp = of.createComprobanteComplemento(); List<Object> list = comp.getAny(); list.add(element); document.setComplemento(comp); } public Object getComprobante() { return document; } } private static JAXBContext getContext(String[] contexts) throws Exception { List<String> ctx = Lists.asList(BASE_CONTEXT, contexts); return JAXBContext.newInstance(JOINER.join(ctx)); } private static Comprobante load(InputStream source, String... contexts) throws Exception { JAXBContext context = getContext(contexts); try { Unmarshaller u = context.createUnmarshaller(); return (Comprobante) u.unmarshal(source); } finally { source.close(); } } static void dump(String title, byte[] bytes, PrintStream out) { out.printf("%s: ", title); for (byte b : bytes) { out.printf("%02x ", b & 0xff); } out.println(); } }