Added JAXB; Added XmlProcessor; Added FailureAnswerGenerator functionality

pom.xml

@@ -37,12 +37,39 @@
 			<artifactId>jcc</artifactId>
 			<version>12.1.0.0</version>
 		</dependency>
-
 		<dependency>
 			<groupId>org.projectlombok</groupId>
 			<artifactId>lombok</artifactId>
 			<optional>true</optional>
 		</dependency>
+		<dependency>
+			<groupId>org.apache.commons</groupId>
+			<artifactId>commons-lang3</artifactId>
+			<version>3.17.0</version>
+		</dependency>
+		<dependency>
+			<groupId>commons-io</groupId>
+			<artifactId>commons-io</artifactId>
+			<version>2.18.0</version>
+		</dependency>
+		<!-- JAXB API -->
+		<dependency>
+			<groupId>jakarta.xml.bind</groupId>
+			<artifactId>jakarta.xml.bind-api</artifactId>
+			<version>4.0.2</version>
+		</dependency>
+		<!--JAXB runtime implementation: eclipse moxy-->
+		<dependency>
+			<groupId>org.eclipse.persistence</groupId>
+			<artifactId>org.eclipse.persistence.moxy</artifactId>
+			<version>4.0.2</version>
+		</dependency>
+		<!-- Activation dependency needed for JAXB -->
+		<dependency>
+			<groupId>com.sun.activation</groupId>
+			<artifactId>jakarta.activation</artifactId>
+			<version>2.0.1</version>
+		</dependency>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-test</artifactId>

src/main/java/ru/nbch/credit_tracker/entities/response/errors/MonitoringError.java

@@ -0,0 +1,25 @@
+package ru.nbch.credit_tracker.entities.response.errors;
+
+import jakarta.xml.bind.annotation.*;
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "MonitoringErrorResponse", propOrder = {
+        "status",
+        "errorCode",
+        "errorText"
+})
+@XmlRootElement(name = "MonitoringErrorResponse")
+public class MonitoringError {
+
+    @XmlElement(name = "Status", required = true)
+    protected String status;
+    @XmlElement(name = "ErrorCode",required = true)
+    protected String errorCode;
+    @XmlElement(name = "ErrorText",required = true)
+    protected String errorText;
+
+}

src/main/java/ru/nbch/credit_tracker/service/FailureAnswerGenerator.java

@@ -1,13 +1,55 @@
 package ru.nbch.credit_tracker.service;
 
+import jakarta.xml.bind.JAXBException;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.io.FileUtils;
 import org.springframework.stereotype.Service;
+import ru.nbch.credit_tracker.entities.response.errors.MonitoringError;
 import ru.nbch.credit_tracker.enums.SignalError;
+import ru.nbch.credit_tracker.service.xml.IXmlProcessor;
+import ru.nbch.credit_tracker.service.xml.XmlUtilService;
 
-// TODO generate xml error file (mb return path ?)
+import java.io.File;
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.util.UUID;
+
+@Slf4j
 @Service
 public class FailureAnswerGenerator {
+    private static final String ANSWER_PATH = "temp_failure_response";
+    private final XmlUtilService xmlUtilService;
+
+    public FailureAnswerGenerator(XmlUtilService xmlUtilService) {
+        this.xmlUtilService = xmlUtilService;
+    }
 
     public String generateFailureAnswer(SignalError error) {
-        return error.getCode() + ": " + error.getMessage();
+        try {
+            File tempFolder = new File(ANSWER_PATH);
+            if (!tempFolder.exists()) {
+                tempFolder.mkdir();
+            }
+            String answerPath = ANSWER_PATH + File.separator + UUID.randomUUID() + File.separator + "error_reply.xml";
+
+            IXmlProcessor xmlProcessor = xmlUtilService.createJaxbProcessor();
+            String errorMessage = xmlProcessor.asString(createErrorMessage(error), false);
+            FileUtils.writeStringToFile(new File(answerPath), errorMessage, Charset.forName("windows-1251"));
+
+            return answerPath;
+        } catch (IOException | JAXBException e) {
+            log.error(e.getMessage(), e);
+        }
+        return null;
     }
+
+    // TODO think about common error class
+    private MonitoringError createErrorMessage(SignalError error) {
+        MonitoringError errorMessage = new MonitoringError();
+        errorMessage.setStatus("error");
+        errorMessage.setErrorCode(error.getCode());
+        errorMessage.setErrorText(error.getMessage());
+        return errorMessage;
+    }
+
 }

src/main/java/ru/nbch/credit_tracker/service/xml/IXmlProcessor.java

@@ -0,0 +1,7 @@
+package ru.nbch.credit_tracker.service.xml;
+
+public interface IXmlProcessor {
+    String asString(Object xmlObj, boolean useStandalone);
+
+    void write(String path, Object xmlObj, boolean useStandalone);
+}

src/main/java/ru/nbch/credit_tracker/service/xml/XmlProcessorImplAnyClasses.java

@@ -0,0 +1,22 @@
+package ru.nbch.credit_tracker.service.xml;
+
+import jakarta.xml.bind.JAXBContext;
+import jakarta.xml.bind.JAXBException;
+import org.eclipse.persistence.jaxb.JAXBContextFactory;
+
+import java.nio.charset.Charset;
+import java.util.HashMap;
+
+public class XmlProcessorImplAnyClasses extends XmlProcessorImplBase {
+    private final JAXBContext context;
+
+    public XmlProcessorImplAnyClasses(Charset charset, Class<?>... classes) throws JAXBException {
+        super(charset.name());
+        this.context = JAXBContextFactory.createContext(classes, new HashMap<>());
+    }
+
+    @Override
+    protected JAXBContext getContextByClass(Class<?> clazz) throws JAXBException {
+        return context;
+    }
+}

src/main/java/ru/nbch/credit_tracker/service/xml/XmlProcessorImplBase.java

@@ -0,0 +1,76 @@
+package ru.nbch.credit_tracker.service.xml;
+
+import jakarta.xml.bind.JAXBContext;
+import jakarta.xml.bind.JAXBException;
+import jakarta.xml.bind.Marshaller;
+import lombok.extern.slf4j.Slf4j;
+import org.eclipse.persistence.jaxb.MarshallerProperties;
+import ru.nbch.credit_tracker.utils.EscapeHandlerUtil;
+
+import java.io.FileOutputStream;
+import java.io.OutputStream;
+import java.io.StringWriter;
+
+@Slf4j
+public abstract class XmlProcessorImplBase implements IXmlProcessor {
+    protected String charsetName;
+
+    public XmlProcessorImplBase() {
+        this.charsetName = "windows-1251";
+    }
+
+    public XmlProcessorImplBase(String charsetName) {
+        this();
+        this.charsetName = charsetName;
+    }
+
+    @Override
+    public String asString(Object xmlObj, boolean useStandalone) {
+        try {
+            StringWriter strWriter = new StringWriter();
+            if (useStandalone) {
+                strWriter.write("<?xml version=\"1.0\" encoding=\"%s\" standalone=\"yes\"?>\n".formatted(charsetName));
+            }
+            genMarshaller(xmlObj, useStandalone).marshal(xmlObj, strWriter);
+            return strWriter.toString();
+        } catch (Throwable e) {
+            log.error("Error serializing object to XML string: {}", e.getMessage());
+            throw new IllegalStateException("cannot serialize object to XML");
+        }
+    }
+
+    @Override
+    public void write(String path, Object xmlObj, boolean useStandalone) {
+        try (OutputStream os = new FileOutputStream(path)) {
+            if (useStandalone) {
+                os.write("<?xml version=\"1.0\" encoding=\"%s\" standalone=\"yes\"?>\n".formatted(charsetName).getBytes(charsetName));
+            }
+            genMarshaller(xmlObj, useStandalone).marshal(xmlObj, os);
+        } catch (Throwable e) {
+            log.error("Error serializing object to XML string: {}", e.getMessage(), e);
+            throw new IllegalStateException("cannot serialize object to XML");
+        }
+    }
+
+    public Marshaller genMarshaller(Object obj, boolean useStandalone) throws JAXBException {
+        Marshaller marshaller = getContextByObject(obj).createMarshaller();
+        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
+        marshaller.setProperty(Marshaller.JAXB_ENCODING, charsetName);
+        if (useStandalone) {
+            marshaller.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE);
+        } else {
+            marshaller.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.FALSE);
+        }
+        marshaller.setProperty(MarshallerProperties.CHARACTER_ESCAPE_HANDLER, EscapeHandlerUtil.createEscapeHandler(marshaller));
+        marshaller.setProperty(MarshallerProperties.INDENT_STRING, "    ");
+        return marshaller;
+    }
+
+    protected JAXBContext getContextByObject(Object obj) throws JAXBException {
+        Class<?> aClass = obj.getClass();
+        return getContextByClass(aClass);
+    }
+
+    protected abstract JAXBContext getContextByClass(Class<?> clazz) throws JAXBException;
+}
+

src/main/java/ru/nbch/credit_tracker/service/xml/XmlUtilService.java

@@ -0,0 +1,17 @@
+package ru.nbch.credit_tracker.service.xml;
+
+import jakarta.xml.bind.JAXBException;
+import org.springframework.stereotype.Service;
+import ru.nbch.credit_tracker.entities.response.errors.MonitoringError;
+
+import java.nio.charset.Charset;
+
+@Service
+public class XmlUtilService {
+
+    public IXmlProcessor createJaxbProcessor() throws JAXBException {
+        return new XmlProcessorImplAnyClasses(Charset.forName("windows-1251"),
+                MonitoringError.class);
+    }
+
+}

src/main/java/ru/nbch/credit_tracker/utils/DumbEscapeHandler.java

@@ -0,0 +1,48 @@
+package ru.nbch.credit_tracker.utils;
+
+import org.eclipse.persistence.oxm.CharacterEscapeHandler;
+
+import java.io.IOException;
+import java.io.Writer;
+
+public class DumbEscapeHandler implements CharacterEscapeHandler {
+    public static final CharacterEscapeHandler theInstance = new DumbEscapeHandler();
+
+    private DumbEscapeHandler() {
+    }
+
+    public void escape(char[] ch, int start, int length, boolean isAttVal, Writer out) throws IOException {
+        int limit = start + length;
+
+        for (int i = start; i < limit; ++i) {
+            switch (ch[i]) {
+                case '"':
+                    if (isAttVal) {
+                        out.write("&quot;");
+                    } else {
+                        out.write(34);
+                    }
+                    break;
+                case '&':
+                    out.write("&amp;");
+                    break;
+                case '<':
+                    out.write("&lt;");
+                    break;
+                case '>':
+                    out.write("&gt;");
+                    break;
+                default:
+                    if (ch[i] > 127) {
+                        out.write("&#");
+                        out.write(Integer.toString(ch[i]));
+                        out.write(59);
+                    } else {
+                        out.write(ch[i]);
+                    }
+            }
+        }
+
+    }
+}
+

src/main/java/ru/nbch/credit_tracker/utils/EscapeHandlerUtil.java

@@ -0,0 +1,58 @@
+package ru.nbch.credit_tracker.utils;
+
+
+import jakarta.xml.bind.Marshaller;
+import jakarta.xml.bind.PropertyException;
+import org.eclipse.persistence.internal.oxm.record.CharacterEscapeHandlerWrapper;
+import org.eclipse.persistence.jaxb.MarshallerProperties;
+import org.eclipse.persistence.oxm.CharacterEscapeHandler;
+//!!! was in <artifactId>eclipselink</artifactId> dependency
+//import org.glassfish.jaxb.core.marshaller.DumbEscapeHandler;
+//import org.glassfish.jaxb.core.marshaller.MinimumEscapeHandler;
+
+public class EscapeHandlerUtil {
+    public static CharacterEscapeHandler createEscapeHandler(Marshaller marshaller) throws PropertyException {
+        org.eclipse.persistence.internal.oxm.CharacterEscapeHandler handler = null;
+        String encoding = (String) marshaller.getProperty(Marshaller.JAXB_ENCODING);
+        Object escapeHandler = marshaller.getProperty(MarshallerProperties.CHARACTER_ESCAPE_HANDLER);
+        if (encoding == null) encoding = "UTF-8";
+        try {
+            if (escapeHandler != null) {
+                try {
+                    handler = (CharacterEscapeHandler) escapeHandler;
+                } catch (Exception ignored) {
+                    handler = new CharacterEscapeHandlerWrapper(escapeHandler);
+                }
+            }
+            else {
+                handler = new NioEscapeHandler(encoding);
+            }
+        } catch (Exception ignored) {
+            handler = DumbEscapeHandler.theInstance;
+        }
+        var finalHandler = handler;
+        return (ch, start, length, isAttVal, out) -> {
+            int limit = start + length;
+            int startToWrite = start;
+            int endToWrite;
+            for (int i = start; i < limit; ++i) {
+                if (ch[i] == '<' || ch[i] == '>') {
+                    if (i > start) {
+                        endToWrite = i;//1;
+                        finalHandler.escape(ch, startToWrite, endToWrite - startToWrite, isAttVal, out);
+                        startToWrite = i + 1;
+                    } else {
+                        startToWrite++;
+                    }
+                    out.write(ch[i]);
+                }
+            }
+            if (startToWrite < limit) {
+                endToWrite = limit - startToWrite;
+                finalHandler.escape(ch, startToWrite, endToWrite, isAttVal, out);
+            }
+        };
+    }
+
+}
+

src/main/java/ru/nbch/credit_tracker/utils/NioEscapeHandler.java

@@ -0,0 +1,52 @@
+package ru.nbch.credit_tracker.utils;
+
+import org.eclipse.persistence.internal.oxm.CharacterEscapeHandler;
+
+import java.io.IOException;
+import java.io.Writer;
+import java.nio.charset.Charset;
+import java.nio.charset.CharsetEncoder;
+
+public class NioEscapeHandler implements CharacterEscapeHandler {
+    private final CharsetEncoder encoder;
+
+    public NioEscapeHandler(String charsetName) {
+        this.encoder = Charset.forName(charsetName).newEncoder();
+    }
+
+    public void escape(char[] ch, int start, int length, boolean isAttVal, Writer out) throws IOException {
+        int limit = start + length;
+
+        for(int i = start; i < limit; ++i) {
+            switch (ch[i]) {
+                case '"':
+                    if (isAttVal) {
+                        out.write("&quot;");
+                    } else {
+                        out.write(34);
+                    }
+                    break;
+                case '&':
+                    out.write("&amp;");
+                    break;
+                case '<':
+                    out.write("&lt;");
+                    break;
+                case '>':
+                    out.write("&gt;");
+                    break;
+                default:
+                    if (this.encoder.canEncode(ch[i])) {
+                        out.write(ch[i]);
+                    } else {
+                        out.write("&#");
+                        out.write(Integer.toString(ch[i]));
+                        out.write(59);
+                    }
+            }
+        }
+
+    }
+}
+
+