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org.daisy.pipeline.css.impl.StylesheetParametersResource Maven / Gradle / Ivy
package org.daisy.pipeline.css.impl;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringReader;
import java.lang.reflect.Field;
import java.net.URI;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLStreamHandler;
import java.net.URLStreamHandlerFactory;
import java.net.URISyntaxException;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Source;
import javax.xml.transform.TransformerException;
import javax.xml.transform.URIResolver;
import javax.xml.transform.sax.SAXSource;
import javax.xml.transform.stream.StreamSource;
import com.google.common.base.Function;
import com.google.common.base.Supplier;
import com.google.common.collect.Iterables;
import com.google.common.collect.Iterators;
import org.daisy.common.file.URLs;
import org.daisy.pipeline.css.CssAnalyzer;
import org.daisy.pipeline.css.CssAnalyzer.SassVariable;
import org.daisy.pipeline.css.Medium;
import org.daisy.pipeline.css.UserAgentStylesheetRegistry;
import org.daisy.pipeline.datatypes.DatatypeRegistry;
import org.daisy.pipeline.job.ZippedJobResources;
import org.daisy.pipeline.script.ScriptInput;
import org.daisy.pipeline.webservice.restlet.AuthenticatedResource;
import org.daisy.pipeline.webservice.restlet.MultipartRequestData;
import org.daisy.pipeline.webservice.xml.XmlUtils;
import org.daisy.pipeline.webservice.xml.XmlValidator;
import org.restlet.data.MediaType;
import org.restlet.data.Status;
import org.restlet.ext.xml.DomRepresentation;
import org.restlet.representation.Representation;
import org.restlet.resource.Post;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.DOMException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
public class StylesheetParametersResource extends AuthenticatedResource {
static final String URI_RESOLVER_KEY = "uri-resolver";
static final String DATATYPE_REGISTRY_KEY = "datatype-registry";
static final String USER_AGENT_STYLESHEET_REGISTRY_KEY = "user-agent-stylesheet-registry";
private static final String STYLESHEET_PARAMETERS_DATA_FIELD = "stylesheet-parameters-data";
private static final String STYLESHEET_PARAMETERS_REQUEST_FIELD = "stylesheet-parameters-request";
private static final URL STYLESHEET_PARAMETERS_REQUEST_SCHEMA_URL
= URLs.getResourceFromJAR("rnc/stylesheetParametersRequest.rnc", StylesheetParametersResource.class);
private static final String NS_DAISY = "http://www.daisy.org/ns/pipeline/data";
private static final Logger logger = LoggerFactory.getLogger(StylesheetParametersResource.class.getName());
private URIResolver uriResolver;
private DatatypeRegistry datatypeRegistry;
private UserAgentStylesheetRegistry userAgentStylesheetRegistry;
@Override
public void doInit() {
super.doInit();
if (!isAuthenticated())
return;
uriResolver = (URIResolver)getContext().getAttributes().get(URI_RESOLVER_KEY);
datatypeRegistry = (DatatypeRegistry)getContext().getAttributes().get(DATATYPE_REGISTRY_KEY);
userAgentStylesheetRegistry
= (UserAgentStylesheetRegistry)getContext().getAttributes().get(USER_AGENT_STYLESHEET_REGISTRY_KEY);
}
/**
* Gets the resource.
*
* @return the resource
*/
@Post
public Representation getResource(Representation representation) {
logRequest();
maybeEnableCORS();
if (!isAuthenticated()) {
setStatus(Status.CLIENT_ERROR_UNAUTHORIZED);
return null;
}
if (representation == null) {
setStatus(Status.CLIENT_ERROR_BAD_REQUEST);
return getErrorRepresentation("POST request with no entity");
}
Document request = null;
ZippedJobResources data; {
if (MediaType.MULTIPART_FORM_DATA.equals(representation.getMediaType(), true)) {
MultipartRequestData multi = null;
try {
multi = MultipartRequestData.processMultipart(getRequest(),
STYLESHEET_PARAMETERS_DATA_FIELD,
STYLESHEET_PARAMETERS_REQUEST_FIELD,
new File(getConfiguration().getTmpDir()));
} catch (Exception e) {
return badRequest(e);
}
if (multi == null) {
setStatus(Status.CLIENT_ERROR_BAD_REQUEST);
return getErrorRepresentation("Multipart data is empty");
}
request = multi.getXml();
data = new ZippedJobResources(multi.getZipFile());
} else {
data = null;
try {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setNamespaceAware(true);
DocumentBuilder builder = factory.newDocumentBuilder();
request = builder.parse(new InputSource(new StringReader(representation.getText())));
} catch (IOException|ParserConfigurationException|SAXException e) {
return badRequest(e);
}
}
}
if (logger.isDebugEnabled())
logger.debug(XmlUtils.nodeToString(request));
if (!XmlValidator.validate(request, STYLESHEET_PARAMETERS_REQUEST_SCHEMA_URL)) {
setStatus(Status.CLIENT_ERROR_BAD_REQUEST);
return getErrorRepresentation("The request is not valid");
}
// using ScriptInput.Builder to validate URIs and convert them to Source objects
ScriptInput inputs; {
ScriptInput.Builder builder = new ScriptInput.Builder(data);
NodeList userStylesheets = request.getElementsByTagNameNS(NS_DAISY, "userStylesheets");
if (userStylesheets.getLength() > 0) {
NodeList files = ((Element)userStylesheets.item(0)).getElementsByTagNameNS(NS_DAISY, "file");
for (int i = 0; i < files.getLength(); i++) {
Element file = (Element)files.item(i);
URI href = URI.create(file.getAttribute("href"));
try {
if ("file".equals(href.getScheme()) && !getConfiguration().isLocalFS())
throw new FileNotFoundException(
"WS does not allow local inputs but a href starting with 'file:' was found: " + href);
else if ("http".equals(href.getScheme()) || "https".equals(href.getScheme()))
builder.withInput("stylesheet",
new ByteArrayInputStream(
("@import url(\"" + href + "\");").getBytes(StandardCharsets.UTF_8)));
else
builder.withInput("stylesheet", href);
} catch (IllegalArgumentException|FileNotFoundException e) {
return badRequest(e);
}
}
}
NodeList sourceDocument = request.getElementsByTagNameNS(NS_DAISY, "sourceDocument");
if (sourceDocument.getLength() > 0) {
NodeList file = ((Element)sourceDocument.item(0)).getElementsByTagNameNS(NS_DAISY, "file");
URI href = URI.create(((Element)file.item(0)).getAttribute("href"));
try {
if ("file".equals(href.getScheme()) && !getConfiguration().isLocalFS())
throw new FileNotFoundException(
"WS does not allow local inputs but a href starting with 'file:' was found: " + href);
builder.withInput("source", href);
} catch (IllegalArgumentException|FileNotFoundException e) {
return badRequest(e);
}
}
inputs = builder.build();
}
List media; {
media = null;
NodeList node = request.getElementsByTagNameNS(NS_DAISY, "media");
if (node.getLength() > 0)
try {
media = Medium.parseMultiple(((Element)node.item(0)).getAttribute("value"));
} catch (IllegalArgumentException e) {
return badRequest(e);
}
if (media == null)
media = Medium.parseMultiple("screen");
}
URI contextBase = URI.create("context:/");
uriResolver = fallback(uriResolver, simpleURIResolver);
URIResolver resolver = data == null
? uriResolver
: new URIResolver() {
@Override
public Source resolve(String href, String base) throws TransformerException {
URI hrefURI = URLs.asURI(href);
if (href.startsWith(contextBase.toString())
|| (base != null && base.startsWith(contextBase.toString())
&& !(hrefURI.isAbsolute() || hrefURI.getSchemeSpecificPart().startsWith("/")))) {
if (!href.startsWith(contextBase.toString()))
hrefURI = URLs.resolve(URLs.asURI(base), hrefURI);
try {
URL u = URLs.asURL(hrefURI);
return new StreamSource(u.openStream(), // implemented in custom URLStreamHandler below
hrefURI.toString());
} catch (IOException e) {
throw new TransformerException(e);
}
}
return uriResolver.resolve(href, base);
}
};
URLStreamHandlerFactory resetURLStreamHandlerFactory = null;
if (data != null)
resetURLStreamHandlerFactory = setURLStreamHandlerFactory(
new URLStreamHandlerFactory() {
@Override
public URLStreamHandler createURLStreamHandler(String protocol) {
if ("context".equals(protocol))
return new URLStreamHandler() {
@Override
protected URLConnection openConnection(URL u) throws IOException {
return new URLConnection(u) {
@Override
public void connect() throws IOException {
}
@Override
public InputStream getInputStream() throws IOException {
Supplier s = data.getResource(URLs.relativize(contextBase, URLs.asURI(u)).getPath());
if (s == null)
throw new FileNotFoundException();
return s.get();
}
};
}
};
else
return null;
}
}
);
try {
Function handleZippedInput = s -> {
if (s.getSystemId() == null)
// this means we used a InputStream
return s;
URI u = URLs.asURI(s.getSystemId());
if (u.getScheme() == null)
// we know that u is a relative URI and that data contains the file
u = URLs.resolve(contextBase, u);
try {
return resolver.resolve(u.toString(), "");
} catch (TransformerException e) {
throw new RuntimeException(e);
}
};
List userAndUserAgentStylesheets = new ArrayList<>(); {
NodeList userAgentStylesheet = request.getElementsByTagNameNS(NS_DAISY, "userAgentStylesheet");
if (userAgentStylesheet.getLength() > 0) {
for (URL u : userAgentStylesheetRegistry.get(
Collections.singleton("text/x-scss"),
Arrays.asList(((Element)userAgentStylesheet.item(0)).getAttribute("mediaType").trim().split("\\s+")),
media))
try {
userAndUserAgentStylesheets.add(simpleURIResolver.resolve(u.toString(), null));
} catch (TransformerException e) {
throw new RuntimeException(e);
}
}
for (Source s : Iterables.transform(inputs.getInput("stylesheet"), handleZippedInput))
userAndUserAgentStylesheets.add(s);
}
Source sourceDocument = Iterables.getFirst(Iterables.transform(inputs.getInput("source"), handleZippedInput), null);
Document parametersDoc; {
parametersDoc = XmlUtils.createDom("parameters");
Element parametersElem = parametersDoc.getDocumentElement();
try {
for (SassVariable v : new CssAnalyzer(media, resolver, datatypeRegistry)
.analyze(userAndUserAgentStylesheets, sourceDocument)
.getVariables()) {
if (v.isDefault()) {
Element parameterElem = parametersDoc.createElementNS(XmlUtils.NS_PIPELINE_DATA, "parameter");
parameterElem.setAttribute("name", v.getName());
parameterElem.setAttribute("nicename", v.getNiceName());
parameterElem.setAttribute("description", v.getDescription());
parameterElem.setAttribute("default", v.getValue());
parameterElem.setAttribute("type", v.getType().getId());
parameterElem.setAttribute("required", "false");
parameterElem.setAttribute("sequence", "false");
parameterElem.setAttribute("ordered", "false");
parametersElem.appendChild(parameterElem);
}
}
} catch (IOException e) {
return badRequest(e);
} catch (DOMException e) { // should not happen
setStatus(Status.SERVER_ERROR_INTERNAL);
return getErrorRepresentation(e.getMessage());
}
DomRepresentation dom = new DomRepresentation(MediaType.APPLICATION_XML, parametersDoc);
setStatus(Status.SUCCESS_OK);
logResponse(dom);
return dom;
}
} finally {
if (data != null)
setURLStreamHandlerFactory(resetURLStreamHandlerFactory);
}
}
private Representation badRequest(Exception e) {
logger.error("bad request:", e);
setStatus(Status.CLIENT_ERROR_BAD_REQUEST);
return getErrorRepresentation(e.getMessage());
}
private static URIResolver simpleURIResolver = new URIResolver() {
@Override
public Source resolve(String href, String base) throws TransformerException {
try {
URI uri; {
if (base != null)
uri = new URI(base).resolve(new URI(href));
else
uri = new URI(href);
}
return new SAXSource(new InputSource(uri.toASCIIString()));
} catch (URISyntaxException e) {
throw new TransformerException(e);
}
}
};
private static URIResolver fallback(URIResolver... resolvers) {
return new URIResolver() {
@Override
public Source resolve(String href, String base) throws TransformerException {
Source source = null;
Iterator iterator = Iterators.forArray(resolvers);
while (iterator.hasNext()) {
source = iterator.next().resolve(href, base);
if (source != null)
break; }
return source;
}
};
}
// see https://stackoverflow.com/a/18018891
private static URLStreamHandlerFactory setURLStreamHandlerFactory(URLStreamHandlerFactory factory) {
try {
Field f = URL.class.getDeclaredField("factory");
f.setAccessible(true);
URLStreamHandlerFactory curFactory = (URLStreamHandlerFactory)f.get(null);
f.set(null, null);
URL.setURLStreamHandlerFactory(factory);
return curFactory;
} catch (NoSuchFieldException|SecurityException|IllegalArgumentException|IllegalAccessException e) {
throw new RuntimeException();
}
}
}
