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Refactored tools services endpoints system and fixed json formatter. (#91)

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Co-authored-by: Artur Kołecki <koleckiartur@icloud.com>
Co-authored-by: Adam Bem <adam.bem@zoho.eu>
Reviewed-on: R11/release11-tools-web#91
This commit is contained in:
Artur Kolecki
2023-03-02 11:49:21 +01:00
parent a90cbb938f
commit b0b930926c
34 changed files with 1000 additions and 444 deletions
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39
Backend/tools-services/src/main/java/com/r11/tools/SparkApplication.java Normal file
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package com.r11.tools;
import com.r11.tools.controller.JsonController;
import com.r11.tools.controller.ProcessorInfoController;
import com.r11.tools.controller.XPathController;
import com.r11.tools.controller.XsdController;
import com.r11.tools.controller.XsltController;
import com.r11.tools.controller.internal.RestControllerRegistry;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import spark.Spark;
public class SparkApplication {
public static void run() {
// TODO: read port from config
Spark.port(8081);
Spark.after((request, response) -> {
response.header("Access-Control-Allow-Origin", "*");
response.header("access-control-allow-headers", "*");
response.header("access-control-expose-headers", "*");
response.header("Access-Control-Allow-Methods", "POST");
});
Logger logger = LogManager.getLogger(SparkApplication.class);
RestControllerRegistry registry = new RestControllerRegistry();
registry.registerController(new ProcessorInfoController(logger));
registry.registerController(new XsdController(logger));
registry.registerController(new XPathController(logger));
registry.registerController(new XsltController(logger));
registry.registerController(new JsonController());
registry.register();
logger.info("Server is online at port: " + Spark.port());
}
}

7
Backend/tools-services/src/main/java/com/r11/tools/SparkInitializer.java Normal file
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package com.r11.tools;
public class SparkInitializer {
public static void main(String[] args) {
SparkApplication.run();
}
}

58
Backend/tools-services/src/main/java/com/r11/tools/controller/JsonController.java Normal file
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package com.r11.tools.controller;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonObject;
import com.r11.tools.controller.internal.GlobalControllerManifest;
import com.r11.tools.controller.internal.HandlerType;
import com.r11.tools.controller.internal.RestController;
import com.r11.tools.controller.internal.ScopedControllerManifest;
import spark.Request;
import spark.Response;
@GlobalControllerManifest(path = "/json")
public class JsonController implements RestController {
private final Gson prettyGson = new GsonBuilder()
.disableHtmlEscaping()
.setPrettyPrinting()
.create();
private final Gson gson = new GsonBuilder()
.disableHtmlEscaping()
.create();
@ScopedControllerManifest(method = HandlerType.POST, path = "/formatting")
public void formatting(Request request, Response response) {
try {
JsonObject jsonObject = this.gson.fromJson(request.body(), JsonObject.class);
response.status(200);
response.body(this.prettyGson.toJson(jsonObject));
} catch (Exception e) {
response.status(500);
Throwable cause = e.getCause();
if (cause == null) {
response.body(e.getMessage());
} else {
response.body(cause.getMessage());
}
}
}
@ScopedControllerManifest(method = HandlerType.POST, path = "/minimize")
public void minimize(Request request, Response response) {
try {
JsonObject jsonObject = this.prettyGson.fromJson(request.body(), JsonObject.class);
response.status(200);
response.body(this.gson.toJson(jsonObject));
} catch (Exception e) {
response.status(500);
Throwable cause = e.getCause();
if (cause == null) {
response.body(e.getMessage());
} else {
response.body(cause.getMessage());
}
}
}
}

34
Backend/tools-services/src/main/java/com/r11/tools/controller/ProcessorInfoController.java Normal file
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package com.r11.tools.controller;
import com.r11.tools.controller.internal.GlobalControllerManifest;
import com.r11.tools.controller.internal.HandlerType;
import com.r11.tools.controller.internal.RestController;
import com.r11.tools.controller.internal.ScopedControllerManifest;
import com.r11.tools.xml.Saxon;
import org.apache.logging.log4j.Logger;
import spark.Request;
import spark.Response;
@GlobalControllerManifest
public class ProcessorInfoController implements RestController {
private final Logger logger;
public ProcessorInfoController(Logger logger) {
this.logger = logger;
}
/**
* Handler that returns processor version
*/
@ScopedControllerManifest(method = HandlerType.GET, path = "/procinfo")
public void processorInfo(Request request, Response response) {
try {
response.header("processor", "Saxon " + Saxon.getVersion() + " over s9api");
response.body(Saxon.getVersion());
} catch (Exception ex) {
this.logger.error("Error on retrieving engine version. " + ex);
response.body(ex.getMessage());
}
}
}

104
Backend/tools-services/src/main/java/com/r11/tools/controller/XPathController.java Normal file
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package com.r11.tools.controller;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.r11.tools.controller.internal.GlobalControllerManifest;
import com.r11.tools.controller.internal.HandlerType;
import com.r11.tools.controller.internal.RestController;
import com.r11.tools.controller.internal.ScopedControllerManifest;
import com.r11.tools.xml.Saxon;
import com.r11.tools.xml.Xalan;
import java.util.HashMap;
import java.util.Map;
import org.apache.logging.log4j.Logger;
import spark.Request;
import spark.Response;
@GlobalControllerManifest
public class XPathController implements RestController {
private final Logger logger;
public XPathController(Logger logger) {
this.logger = logger;
}
@ScopedControllerManifest(method = HandlerType.POST, path = "/xpath")
public void transform(Request request, Response response) throws JsonProcessingException {
String body = request.body();
ObjectMapper mapper = new ObjectMapper();
Map<String, String> requestMap = new HashMap<>();
Map<String, String> responseMap = new HashMap<>();
try {
requestMap = mapper.readValue(body, Map.class);
} catch (JsonProcessingException ex) {
this.logger.error("Request JSON error. " + ex);
responseMap.put("result", ex.getMessage());
responseMap.put("processor", "N/A");
responseMap.put("status", "ERR");
responseMap.put("time", "N/A");
response.status(400);
response.body(mapper.writeValueAsString(responseMap));
return;
}
String data = requestMap.get("data");
String query = requestMap.get("process");
String processor = requestMap.get("processor");
String version = requestMap.get("version");
String tmp = "";
long timeStart;
long duration;
if (processor == null) {
response.body("saxon, xalan");
return;
}
switch (processor) {
case "saxon":
response.header("processor", "Saxon " + Saxon.getVersion() + " " + version + " over s9api");
timeStart = System.currentTimeMillis();
try {
tmp = Saxon.processXPath(data, query, version).trim();
responseMap.put("result", tmp);
responseMap.put("status", "OK");
} catch (Exception ex) {
this.logger.error("Error on processing XPath using Saxon. " + ex);
responseMap.put("result", ex.getMessage());
responseMap.put("status", "ERR");
response.status(400);
}
duration = System.currentTimeMillis() - timeStart;
this.logger.info("Request" + body + " processed in " + duration + " ms.");
responseMap.put("processor", "Saxon " + Saxon.getVersion() + " " + version + " over s9api");
responseMap.put("time", "" + duration);
response.body(mapper.writeValueAsString(responseMap));
return;
case "xalan":
response.header("processor", Xalan.getVersion());
timeStart = System.currentTimeMillis();
try {
tmp = Xalan.processXPath(data, query).trim();
responseMap.put("result", tmp);
responseMap.put("status", "OK");
} catch (Exception ex) {
this.logger.error("Error on processing XPath using Xalan. " + ex);
responseMap.put("result", ex.getMessage());
responseMap.put("status", "ERR");
response.status(400);
}
duration = System.currentTimeMillis() - timeStart;
this.logger.info("Request: " + body + " processed in " + duration + " ms.");
responseMap.put("processor", Xalan.getVersion());
responseMap.put("time", Long.toString(duration));
response.body(mapper.writeValueAsString(responseMap));
return;
default:
response.body("saxon, xalan");
}
}
}

70
Backend/tools-services/src/main/java/com/r11/tools/controller/XsdController.java Normal file
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package com.r11.tools.controller;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.r11.tools.controller.internal.GlobalControllerManifest;
import com.r11.tools.controller.internal.HandlerType;
import com.r11.tools.controller.internal.RestController;
import com.r11.tools.controller.internal.ScopedControllerManifest;
import com.r11.tools.xml.Xalan;
import java.util.HashMap;
import java.util.Map;
import org.apache.logging.log4j.Logger;
import spark.Request;
import spark.Response;
@GlobalControllerManifest
public class XsdController implements RestController {
private final Logger logger;
public XsdController(Logger logger) {
this.logger = logger;
}
@ScopedControllerManifest(method = HandlerType.POST, path = "/xsd")
public Response transform(Request req, Response resp) throws JsonProcessingException {
String body = req.body();
ObjectMapper mapper = new ObjectMapper();
Map<String, String> requestMap = new HashMap<>();
Map<String, String> responseMap = new HashMap<>();
try {
requestMap = mapper.readValue(body, Map.class);
} catch (JsonProcessingException ex) {
this.logger.error("Request JSON error. " + ex);
responseMap.put("result", ex.getMessage());
responseMap.put("processor", "N/A");
responseMap.put("status", "ERR");
responseMap.put("time", "N/A");
resp.status(400);
resp.body(mapper.writeValueAsString(responseMap));
return resp;
}
String data = requestMap.get("data");
String xsd = requestMap.get("process");
resp.header("processor", Xalan.getVersion());
long timeStart = System.currentTimeMillis();
String tmp;
try {
tmp = Xalan.validate(data, xsd).trim();
responseMap.put("result", tmp);
responseMap.put("status", "OK");
} catch (Exception ex) {
this.logger.error("Error on validation against XSD using Xalan. " + ex);
responseMap.put("result", ex.getMessage());
responseMap.put("status", "ERR");
resp.status(400);
}
long duration = System.currentTimeMillis() - timeStart;
this.logger.info("Request: " + body + " processed in " + duration + " ms.");
responseMap.put("processor", Xalan.getVersion());
responseMap.put("time", "" + duration);
resp.body(mapper.writeValueAsString(responseMap));
return resp;
}
}

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Backend/tools-services/src/main/java/com/r11/tools/controller/XsltController.java Normal file
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package com.r11.tools.controller;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.r11.tools.controller.internal.GlobalControllerManifest;
import com.r11.tools.controller.internal.HandlerType;
import com.r11.tools.controller.internal.RestController;
import com.r11.tools.controller.internal.ScopedControllerManifest;
import com.r11.tools.xml.Saxon;
import com.r11.tools.xml.Xalan;
import java.util.HashMap;
import java.util.Map;
import org.apache.logging.log4j.Logger;
import spark.Request;
import spark.Response;
@GlobalControllerManifest
public class XsltController implements RestController {
private final Logger logger;
public XsltController(Logger logger) {
this.logger = logger;
}
@ScopedControllerManifest(method = HandlerType.POST, path = "/xslt")
public void transform(Request request, Response response) throws JsonProcessingException {
String body = request.body();
ObjectMapper mapper = new ObjectMapper();
Map<String, String> requestMap = new HashMap<>();
Map<String, String> responseMap = new HashMap<>();
try {
requestMap = mapper.readValue(body, Map.class);
} catch (JsonMappingException | JsonParseException ex) {
this.logger.error("Request JSON error. " + ex);
responseMap.put("result", ex.getMessage());
responseMap.put("processor", "N/A");
responseMap.put("status", "ERR");
responseMap.put("time", "N/A");
response.status(400);
response.body(mapper.writeValueAsString(responseMap));
return;
}
String data = requestMap.get("data");
String query = requestMap.get("process");
String processor = requestMap.get("processor");
String version = requestMap.get("version");
if (processor == null) {
response.body("saxon, xalan");
return;
}
String tmp;
long timeStart;
long duration;
switch (processor) {
case "saxon":
timeStart = System.currentTimeMillis();
try {
tmp = Saxon.processXSLT(data, query);
responseMap.put("result", tmp);
responseMap.put("status", "OK");
} catch (Exception ex) {
this.logger.error("Error on processing XSLT using Saxon. " + ex);
responseMap.put("result", ex.getMessage());
responseMap.put("status", "ERR");
response.status(400);
}
duration = System.currentTimeMillis() - timeStart;
this.logger.info("Request: " + body + " processed in " + duration + " ms.");
responseMap.put("processor", "Saxon " + Saxon.getVersion() + " " + version);
responseMap.put("time", Long.toString(duration));
response.body(mapper.writeValueAsString(responseMap));
return;
case "xalan":
timeStart = System.currentTimeMillis();
try {
tmp = Xalan.processXSLT(data, query);
responseMap.put("result", tmp);
responseMap.put("status", "OK");
} catch (Exception ex) {
this.logger.error("Error on processing XSLT using Xalan. " + ex);
responseMap.put("result", ex.getMessage());
responseMap.put("status", "ERR");
response.status(400);
}
duration = System.currentTimeMillis() - timeStart;
this.logger.info("Request: " + body + " processed in " + duration + " ms.");
responseMap.put("processor", Xalan.getVersion());
responseMap.put("time", Long.toString(duration));
response.body(mapper.writeValueAsString(responseMap));
return;
default:
response.body("saxon, xalan");
}
}
}

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Backend/tools-services/src/main/java/com/r11/tools/controller/internal/GlobalControllerManifest.java Normal file
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package com.r11.tools.controller.internal;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
public @interface GlobalControllerManifest {
String path() default "";
}

7
Backend/tools-services/src/main/java/com/r11/tools/controller/internal/HandlerType.java Normal file
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package com.r11.tools.controller.internal;
public enum HandlerType {
GET, POST, PUT, DELETE
}

5
Backend/tools-services/src/main/java/com/r11/tools/controller/internal/RestController.java Normal file
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package com.r11.tools.controller.internal;
public interface RestController {
}

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Backend/tools-services/src/main/java/com/r11/tools/controller/internal/RestControllerRegistry.java Normal file
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package com.r11.tools.controller.internal;
import com.r11.tools.controller.internal.path.PathBuilder;
import java.lang.reflect.Method;
import java.util.HashSet;
import java.util.Set;
import spark.Spark;
public class RestControllerRegistry {
private final Set<RestController> registeredControllers;
public RestControllerRegistry() {
this.registeredControllers = new HashSet<>();
}
public void registerController(RestController restController) {
this.registeredControllers.add(restController);
}
public void register() {
this.registeredControllers.forEach(controller -> {
if (controller.getClass().isAnnotationPresent(GlobalControllerManifest.class)) {
for (Method method : controller.getClass().getMethods()) {
this.registerAssignableHandlers(controller.getClass(), controller, method);
}
}
});
}
private void registerAssignableHandlers(Class<? extends RestController> parent, RestController parentValue, Method method) {
if (
(parent.isAnnotationPresent(GlobalControllerManifest.class)) &&
(method.isAnnotationPresent(ScopedControllerManifest.class))
) {
HandlerType handlerType = method.getAnnotation(ScopedControllerManifest.class).method();
String path = PathBuilder.resolvePathOf(
parent.getAnnotation(GlobalControllerManifest.class).path(),
method.getAnnotation(ScopedControllerManifest.class).path()
);
switch (handlerType) {
case GET:
Spark.get(path, (request, response) -> method.invoke(parentValue, request, response));
break;
case PUT:
Spark.put(path, (request, response) -> method.invoke(parentValue, request, response));
break;
case POST:
Spark.post(path, (request, response) -> method.invoke(parentValue, request, response));
break;
case DELETE:
Spark.delete(path, (request, response) -> method.invoke(parentValue, request, response));
break;
}
}
}
}

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Backend/tools-services/src/main/java/com/r11/tools/controller/internal/ScopedControllerManifest.java Normal file
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package com.r11.tools.controller.internal;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface ScopedControllerManifest {
HandlerType method();
String path();
}

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Backend/tools-services/src/main/java/com/r11/tools/controller/internal/path/PathBuilder.java Normal file
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package com.r11.tools.controller.internal.path;
public final class PathBuilder {
private static final String PATH_SEPARATOR = "/";
private PathBuilder() {
}
public static String resolvePathOf(String globalPath, String scopedPath) {
String resolvedPath =
PathBuilder.removeTrailingPathSeparator(globalPath) +
PathBuilder.removeTrailingPathSeparator(scopedPath);
if (resolvedPath.endsWith(PATH_SEPARATOR)) {
resolvedPath = resolvedPath.substring(0, resolvedPath.length() - 1);
}
return PATH_SEPARATOR + resolvedPath;
}
private static String removeTrailingPathSeparator(String path) {
if (path.endsWith(PATH_SEPARATOR)) {
return path.substring(0, path.length() - 1);
}
return path;
}
}

65
Backend/tools-services/src/main/java/com/r11/tools/xml/NewNamespaceResolver.java Normal file
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package com.r11.tools.xml;
import net.sf.saxon.om.NamespaceMap;
import net.sf.saxon.s9api.XPathCompiler;
import net.sf.saxon.s9api.XdmNode;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
/**
* Handler for saxon namespace scan engine.
* All found namespaces are stored within {@link #namespaceMap}
* @author Wojciech Czop
*/
public class NewNamespaceResolver {
private static final Logger LOG = LogManager.getLogger("NewNamespaceResolver");
private NamespaceMap namespaceMap;
/**
* Initializes {@link #namespaceMap} with namespace values
* @param doc dom structure object
* @return map of namespaces
*/
// TODO: Closer inspection. Return value is never used according to IntelliJ
//
public NamespaceMap process(XdmNode doc) {
namespaceMap = NamespaceMap.emptyMap();
// TODO: remove
for (XdmNode tmp : doc.children()) {
extractNamespace(tmp);
}
// end
return namespaceMap;
}
/**
* Iterates through {@link #namespaceMap} and declares namespaces in {@link XPathCompiler}
* @param compiler compiler used to compile xpath statements
*/
public void exportNamespaces(XPathCompiler compiler){
namespaceMap.forEach(namespaceBinding -> compiler.declareNamespace(namespaceBinding.getPrefix(), namespaceBinding.getURI()));
}
/**
* Uses recurrency to dive deep dom structure and appends {@link #namespaceMap} with every found namespace
* @param node dom structure object
*/
private void extractNamespace(XdmNode node) {
NamespaceMap tmp;
if ((tmp = node.getUnderlyingNode().getAllNamespaces()) != null) {
namespaceMap = namespaceMap.putAll(tmp);
}
if (node.children().iterator().hasNext()) {
for (XdmNode rNode : node.children()) {
if (rNode.getUnderlyingNode().getPrefix().isEmpty() && !rNode.getParent().getUnderlyingNode().getPrefix().isEmpty()) {
LOG.warn("Missing prefix. Parent has " + rNode.getParent().getUnderlyingNode().getPrefix() + ", but child has none");
}
extractNamespace(rNode);
}
}
}
}

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Backend/tools-services/src/main/java/com/r11/tools/xml/Saxon.java Normal file
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package com.r11.tools.xml;
import net.sf.saxon.s9api.*;
import javax.xml.transform.stream.StreamSource;
import java.io.StringReader;
import java.io.StringWriter;
/**
* Handler for Saxon engine
* @author Wojciech Czop
*/
public class Saxon {
/**
* Transforms string containing xml document via xslt
* @param data xml to be transformed
* @param transform xslt
* @return transformed xml
* @throws SaxonApiException thrown on stylesheet or transformation errors
*/
public static String processXSLT(String data, String transform) throws SaxonApiException {
Processor processor = new Processor(false);
XsltCompiler compiler = processor.newXsltCompiler();
XsltExecutable stylesheet = compiler.compile(new StreamSource(new StringReader(transform)));
StringWriter sw = new StringWriter();
Serializer out = processor.newSerializer(sw);
out.setOutputProperty(Serializer.Property.METHOD, "xml");
out.setOutputProperty(Serializer.Property.INDENT, "yes");
Xslt30Transformer transformer = stylesheet.load30();
transformer.transform(new StreamSource(new StringReader(data)), out);
return sw.toString();
}
/**
* Process xpath and return either node or wrapped atomic value
* @param data xml to be querried
* @param query xpath queryy
* @param version processor version
* @return string xml representation of the node
* @throws Exception thrown on node building errors or invalid xpath
*/
public static String processXPath(String data, String query, String version) throws Exception {
Processor p = new Processor(false);
XPathCompiler compiler = p.newXPathCompiler();
DocumentBuilder builder = p.newDocumentBuilder();
XdmNode doc = builder.build(new StreamSource(new StringReader(data)));
compiler.setLanguageVersion(version);
NewNamespaceResolver resolver = new NewNamespaceResolver();
resolver.process(doc);
resolver.exportNamespaces(compiler);
XdmValue result = compiler.evaluate(query, doc);
StringBuilder sb = new StringBuilder();
for (XdmItem xdmItem : result) {
sb.append(xdmItem);
sb.append('\n');
}
return sb.toString();
}
/**
* Returns version of the processor
* @return version of the processor
*/
public static String getVersion() {
return new Processor(false).getSaxonProductVersion();
}
}

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Backend/tools-services/src/main/java/com/r11/tools/xml/Xalan.java Normal file
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package com.r11.tools.xml;
import org.apache.xpath.XPathAPI;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.traversal.NodeIterator;
import org.xml.sax.InputSource;
import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.*;
import javax.xml.transform.dom.DOMSource;
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 java.io.*;
/**
* Handler for Xalan engine
* @author Wojciech Czop
*/
public class Xalan {
/**
* Transforms string containing xml document via xslt
* @param data xml to be transformed
* @param transform xslt
* @return transformed xml
* @throws Exception thrown on stylesheet or transformation errors
*/
public static String processXSLT(String data, String transform) throws Exception{
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.parse(new InputSource(new StringReader(data)));
StreamSource stylesource = new StreamSource(new StringReader(transform));
Transformer transformer = TransformerFactory.newInstance().newTransformer(stylesource);
transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
Source source = new DOMSource(document);
StringWriter sw = new StringWriter();
Result outputTarget = new StreamResult(sw);
transformer.transform(source, outputTarget);
return sw.toString();
}
private static boolean isTextNode(Node n) {
if (n == null)
return false;
short nodeType = n.getNodeType();
return nodeType == Node.CDATA_SECTION_NODE || nodeType == Node.TEXT_NODE;
}
/**
* Process xpath and return either node or wrapped atomic value
* @param data xml
* @param transform xpath
* @return xml processed using given xpath
* @throws Exception thrown on node building errors or invalid xpath
*/
public static String processXPath(String data, String transform) throws Exception {
// Set up a DOM tree to query.
InputSource in = new InputSource(new StringReader(data));
DocumentBuilderFactory dfactory = DocumentBuilderFactory.newInstance();
dfactory.setNamespaceAware(true);
Document doc = dfactory.newDocumentBuilder().parse(in);
// Set up an identity transformer to use as serializer.
Transformer serializer = TransformerFactory.newInstance().newTransformer();
serializer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
// Use the simple XPath API to select a nodeIterator.
NodeIterator nl = XPathAPI.selectNodeIterator(doc, transform);
// Serialize the found nodes to result object.
StringBuilder result = new StringBuilder();
Node n;
while ((n = nl.nextNode())!= null) {
StringBuilder sb;
if (isTextNode(n)) {
// DOM may have more than one node corresponding to a
// single XPath text node. Coalesce all contiguous text nodes
// at this level
for (Node nn = n.getNextSibling(); isTextNode(nn); nn = nn.getNextSibling()) {
result.append(nn.getNodeValue());
}
} else {
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
serializer.transform(new DOMSource(n), new StreamResult(new OutputStreamWriter(outputStream)));
result.append(outputStream);
}
result.append("\n");
}
return result.toString();
}
/**
* Returns version of the processor
* @return version of the processor
*/
public static String getVersion(){
return org.apache.xalan.Version.getVersion();
}
/**
* Validates string representation of the xml document against xsd schema
* @param data xml document
* @param xsd xsd schema
* @return statement of validity
* @throws Exception thrown on invalid xsd schema or xml
*/
public static String validate(String data, String xsd) throws Exception{
Source dataSource = new StreamSource(new StringReader(data));
Source xsdSource = new StreamSource(new StringReader(xsd));
SchemaFactory schemaFactory = SchemaFactory
.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
Schema schema = schemaFactory.newSchema(xsdSource);
Validator validator = schema.newValidator();
validator.validate(dataSource);
return "XML file is valid";
}
}

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Backend/tools-services/src/main/java/com/r11/tools/xml/XalanNamespaceResolver.java Normal file
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package com.r11.tools.xml;
import org.w3c.dom.*;
import javax.xml.XMLConstants;
import javax.xml.namespace.NamespaceContext;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
/**
* Contains methods that scan document for namespaces and store them in map objects.
* @deprecated
* Class no longer in use. It has been replaced by {@link NewNamespaceResolver}
* @author Wojciech Czop
*/
public class XalanNamespaceResolver implements NamespaceContext {
private static final String DEFAULT_NS = "DEFAULT";
private Map<String, String> prefix2Uri = new HashMap<String, String>();
private Map<String, String> uri2Prefix = new HashMap<String, String>();
/**
* This constructor parses the document and stores all namespaces it can
* find. If toplevelOnly is true, only namespaces in the root are used.
*
* @param document
* source document
* @param toplevelOnly
* restriction of the search to enhance performance
*/
public XalanNamespaceResolver(Document document, boolean toplevelOnly) {
examineNode(document.getFirstChild(), toplevelOnly);
System.out.println("The list of the cached namespaces:");
for (String key : prefix2Uri.keySet()) {
System.out.println("prefix " + key + ": uri " + prefix2Uri.get(key));
}
}
/**
* A single node is read, the namespace attributes are extracted and stored.
*
* @param node
* to examine
* @param attributesOnly,
* if true no recursion happens
*/
private void examineNode(Node node, boolean attributesOnly) {
NamedNodeMap attributes = node.getAttributes();
for (int i = 0; i < attributes.getLength(); i++) {
Node attribute = attributes.item(i);
storeAttribute((Attr) attribute);
}
if (!attributesOnly) {
NodeList chields = node.getChildNodes();
for (int i = 0; i < chields.getLength(); i++) {
Node chield = chields.item(i);
if (chield.getNodeType() == Node.ELEMENT_NODE){
examineNode(chield, false);
}
}
}
}
/**
* This method looks at an attribute and stores it, if it is a namespace
* attribute.
*
* @param attribute
* to examine
*/
private void storeAttribute(Attr attribute) {
// examine the attributes in namespace xmlns
String uri = attribute.getNamespaceURI();
String name = attribute.getLocalName();
String name2 = attribute.getName();
String value = attribute.getNodeValue();
if (attribute.getNodeValue() != null
/*&& attribute.getNamespaceURI().equals(
XMLConstants.XMLNS_ATTRIBUTE_NS_URI)*/) {
// Default namespace xmlns="uri goes here"
if (attribute.getNodeName().equals(XMLConstants.XMLNS_ATTRIBUTE)) {
putInCache(DEFAULT_NS, attribute.getNodeValue());
} else {
// The defined prefixes are stored here
putInCache(attribute.getName().replace("xmlns:", ""), attribute.getNodeValue());
}
}
}
/**
* Stores namespace prefix ass well as its uri in map
* @param prefix
* @param uri
*/
private void putInCache(String prefix, String uri) {
prefix2Uri.put(prefix, uri);
uri2Prefix.put(uri, prefix);
}
/**
* This method is called by XPath. It returns the default namespace, if the
* prefix is null or "".
*
* @param prefix
* to search for
* @return uri
*/
public String getNamespaceURI(String prefix) {
if (prefix == null || prefix.equals(XMLConstants.DEFAULT_NS_PREFIX)) {
return prefix2Uri.get(DEFAULT_NS);
} else {
return prefix2Uri.get(prefix);
}
}
/**
* This method is not needed in this context, but can be implemented in a
* similar way.
*/
public String getPrefix(String namespaceURI) {
return uri2Prefix.get(namespaceURI);
}
public Iterator getPrefixes(String namespaceURI) {
// Not implemented
return null;
}
}

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Backend/tools-services/src/main/resources/log4j.properties Normal file
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# Set root logger level to DEBUG and its only appender to A1.
log4j.rootLogger=ERROR, A1
# A1 is set to be a ConsoleAppender.
log4j.appender.A1=org.apache.log4j.ConsoleAppender
# A1 uses PatternLayout.
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n

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Backend/tools-services/src/main/resources/log4j2.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
<Appenders>
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout pattern="%d{HH:mm:ss.SSS} [%c] %-5level - %msg%n"/>
</Console>
<File name="File" fileName="/tmp/xml_tools_java_backend.log" append="true">
<PatternLayout>
<Pattern>%d{HH:mm:ss.SSS} [%c] %-5level - %msg%n</Pattern>
</PatternLayout>
</File>
</Appenders>
<Loggers>
<Logger name="com.r11.tools.SparkApplication" level="info" additivity="true">
<AppenderRef ref="Console"/>
</Logger>
<Root level="info">
<AppenderRef ref="File"/>
</Root>
</Loggers>
</Configuration>