337 lines
11 KiB
Java
337 lines
11 KiB
Java
package net.filebot.web;
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import static java.nio.charset.StandardCharsets.*;
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import static net.filebot.Logging.*;
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import static net.filebot.util.FileUtilities.*;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.OutputStream;
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import java.io.Reader;
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import java.io.StringReader;
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import java.io.StringWriter;
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import java.io.UnsupportedEncodingException;
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import java.net.HttpURLConnection;
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import java.net.URL;
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import java.net.URLConnection;
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import java.net.URLEncoder;
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import java.nio.ByteBuffer;
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import java.nio.charset.Charset;
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import java.time.Instant;
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import java.time.ZoneOffset;
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import java.time.ZonedDateTime;
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import java.time.format.DateTimeFormatter;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Map;
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import java.util.Map.Entry;
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import java.util.function.Supplier;
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import java.util.logging.Level;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import java.util.zip.GZIPInputStream;
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import java.util.zip.GZIPOutputStream;
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import java.util.zip.Inflater;
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import java.util.zip.InflaterInputStream;
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import javax.xml.parsers.DocumentBuilderFactory;
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import javax.xml.parsers.ParserConfigurationException;
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import javax.xml.parsers.SAXParserFactory;
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import javax.xml.transform.OutputKeys;
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import javax.xml.transform.Transformer;
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import javax.xml.transform.TransformerException;
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import javax.xml.transform.TransformerFactory;
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import javax.xml.transform.dom.DOMSource;
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import javax.xml.transform.stream.StreamResult;
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import net.filebot.util.ByteBufferOutputStream;
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import org.w3c.dom.Document;
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import org.xml.sax.InputSource;
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import org.xml.sax.SAXException;
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import org.xml.sax.XMLReader;
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import org.xml.sax.helpers.DefaultHandler;
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public final class WebRequest {
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public static Reader getReader(URLConnection connection) throws IOException {
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try {
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connection.addRequestProperty("Accept-Encoding", "gzip,deflate");
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connection.addRequestProperty("Accept-Charset", "UTF-8,ISO-8859-1");
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} catch (IllegalStateException e) {
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// too bad, can't request gzipped document anymore
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}
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Charset charset = getCharset(connection.getContentType());
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String encoding = connection.getContentEncoding();
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InputStream inputStream = connection.getInputStream();
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if ("gzip".equalsIgnoreCase(encoding))
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inputStream = new GZIPInputStream(inputStream);
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else if ("deflate".equalsIgnoreCase(encoding)) {
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inputStream = new InflaterInputStream(inputStream, new Inflater(true));
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}
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return new InputStreamReader(inputStream, charset);
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}
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public static Document getDocument(URL url) throws IOException, SAXException {
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return getDocument(url.openConnection());
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}
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public static Document getDocument(URLConnection connection) throws IOException, SAXException {
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return getDocument(new InputSource(getReader(connection)));
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}
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public static Document getDocument(String xml) throws IOException, SAXException {
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return getDocument(new InputSource(new StringReader(xml)));
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}
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public static Document getDocument(InputSource source) throws IOException, SAXException {
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try {
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DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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factory.setValidating(false);
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factory.setFeature("http://xml.org/sax/features/namespaces", false);
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factory.setFeature("http://xml.org/sax/features/validation", false);
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return factory.newDocumentBuilder().parse(source);
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} catch (ParserConfigurationException e) {
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// will never happen
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throw new RuntimeException(e);
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}
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}
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public static ByteBuffer fetch(URL resource) throws IOException {
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return fetch(resource, 0, null, null, null);
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}
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public static ByteBuffer fetchIfModified(URL resource, long ifModifiedSince) throws IOException {
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return fetch(resource, ifModifiedSince, null, null, null);
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}
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public static ByteBuffer fetchIfNoneMatch(URL resource, Object etag) throws IOException {
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return fetch(resource, 0, etag, null, null);
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}
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public static ByteBuffer fetch(URL url, long ifModifiedSince, Object etag, Map<String, String> requestParameters, Map<String, List<String>> responseParameters) throws IOException {
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URLConnection connection = url.openConnection();
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if (ifModifiedSince > 0) {
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connection.setIfModifiedSince(ifModifiedSince);
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} else if (etag != null) {
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// If-Modified-Since must not be set if If-None-Match is set and vice versa
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connection.addRequestProperty("If-None-Match", etag.toString());
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}
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try {
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connection.addRequestProperty("Accept-Encoding", "gzip,deflate");
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connection.addRequestProperty("Accept-Charset", "UTF-8");
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} catch (IllegalStateException e) {
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// too bad, can't request gzipped data
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}
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if (requestParameters != null) {
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for (Entry<String, String> parameter : requestParameters.entrySet()) {
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connection.addRequestProperty(parameter.getKey(), parameter.getValue());
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}
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}
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int contentLength = connection.getContentLength();
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String encoding = connection.getContentEncoding();
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InputStream in = connection.getInputStream();
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if ("gzip".equalsIgnoreCase(encoding))
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in = new GZIPInputStream(in);
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else if ("deflate".equalsIgnoreCase(encoding)) {
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in = new InflaterInputStream(in, new Inflater(true));
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}
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// store response headers
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if (responseParameters != null) {
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responseParameters.putAll(connection.getHeaderFields());
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}
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ByteBufferOutputStream buffer = new ByteBufferOutputStream(contentLength >= 0 ? contentLength : 4 * 1024);
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try {
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// read all
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buffer.transferFully(in);
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} catch (IOException e) {
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// if the content length is not known in advance an IOException (Premature EOF)
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// is always thrown after all the data has been read
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if (contentLength >= 0) {
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throw e;
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}
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} finally {
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in.close();
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}
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// no data, e.g. If-Modified-Since requests
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if (contentLength < 0 && buffer.getByteBuffer().remaining() == 0) {
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return null;
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}
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return buffer.getByteBuffer();
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}
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public static ByteBuffer post(URL url, Map<String, ?> parameters, Map<String, String> requestParameters) throws IOException {
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byte[] postData = encodeParameters(parameters, true).getBytes("UTF-8");
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if (requestParameters != null && "gzip".equals(requestParameters.get("Content-Encoding"))) {
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postData = gzip(postData);
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}
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return post(url, postData, "application/x-www-form-urlencoded", requestParameters);
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}
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public static ByteBuffer post(URL url, byte[] postData, String contentType, Map<String, String> requestParameters) throws IOException {
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HttpURLConnection connection = (HttpURLConnection) url.openConnection();
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connection.addRequestProperty("Content-Length", String.valueOf(postData.length));
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connection.addRequestProperty("Content-Type", contentType);
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connection.setRequestMethod("POST");
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connection.setDoOutput(true);
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if (requestParameters != null) {
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for (Entry<String, String> parameter : requestParameters.entrySet()) {
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connection.addRequestProperty(parameter.getKey(), parameter.getValue());
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}
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}
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// write post data
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OutputStream out = connection.getOutputStream();
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out.write(postData);
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out.close();
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// read response
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int contentLength = connection.getContentLength();
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String encoding = connection.getContentEncoding();
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InputStream in = connection.getInputStream();
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if ("gzip".equalsIgnoreCase(encoding))
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in = new GZIPInputStream(in);
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else if ("deflate".equalsIgnoreCase(encoding)) {
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in = new InflaterInputStream(in, new Inflater(true));
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}
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ByteBufferOutputStream buffer = new ByteBufferOutputStream(contentLength >= 0 ? contentLength : BUFFER_SIZE);
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try {
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// read all
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buffer.transferFully(in);
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} catch (IOException e) {
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// if the content length is not known in advance an IOException (Premature EOF)
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// is always thrown after all the data has been read
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if (contentLength >= 0) {
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throw e;
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}
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} finally {
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in.close();
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}
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return buffer.getByteBuffer();
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}
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public static int head(URL url) throws IOException {
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HttpURLConnection c = (HttpURLConnection) url.openConnection();
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c.setRequestMethod("HEAD");
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return c.getResponseCode();
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}
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public static String encodeParameters(Map<String, ?> parameters, boolean unicode) {
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StringBuilder sb = new StringBuilder();
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for (Entry<String, ?> entry : parameters.entrySet()) {
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if (sb.length() > 0) {
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sb.append("&");
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}
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sb.append(entry.getKey());
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if (entry.getValue() != null) {
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sb.append("=");
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sb.append(encode(entry.getValue().toString(), unicode));
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}
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}
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return sb.toString();
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}
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private static byte[] gzip(byte[] data) throws IOException {
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ByteArrayOutputStream out = new ByteArrayOutputStream(data.length);
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GZIPOutputStream gzip = new GZIPOutputStream(out);
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gzip.write(data);
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gzip.close();
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return out.toByteArray();
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}
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public static String encode(String string, boolean unicode) {
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try {
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return URLEncoder.encode(string, unicode ? "UTF-8" : "ISO-8859-1");
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} catch (UnsupportedEncodingException e) {
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throw new RuntimeException(e);
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}
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}
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private static Charset getCharset(String contentType) {
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if (contentType != null) {
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// e.g. Content-Type: text/html; charset=iso-8859-1
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Matcher matcher = Pattern.compile("charset=[\"]?([\\p{Graph}&&[^\"]]+)[\"]?").matcher(contentType);
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if (matcher.find()) {
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try {
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return Charset.forName(matcher.group(1));
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} catch (IllegalArgumentException e) {
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debug.log(Level.WARNING, "Illegal charset: " + contentType);
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}
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}
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// use http default encoding only for text/html
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if (contentType.equals("text/html")) {
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return ISO_8859_1;
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}
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}
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// use UTF-8 if we don't know any better
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return UTF_8;
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}
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public static String getXmlString(Document dom, boolean indent) throws TransformerException {
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Transformer tr = TransformerFactory.newInstance().newTransformer();
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tr.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
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tr.setOutputProperty(OutputKeys.INDENT, indent ? "yes" : "no");
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// create string from dom
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StringWriter buffer = new StringWriter();
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tr.transform(new DOMSource(dom), new StreamResult(buffer));
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return buffer.toString();
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}
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public static void validateXml(String xml) throws SAXException, ParserConfigurationException, IOException {
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SAXParserFactory sax = SAXParserFactory.newInstance();
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sax.setValidating(false);
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sax.setNamespaceAware(false);
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XMLReader reader = sax.newSAXParser().getXMLReader();
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// throw exception on error
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reader.setErrorHandler(new DefaultHandler());
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reader.parse(new InputSource(new StringReader(xml)));
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}
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public static Supplier<String> log(URL url, long lastModified, Object etag) {
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return () -> {
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List<String> headers = new ArrayList<String>(2);
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if (etag != null) {
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headers.add("If-None-Match: " + etag);
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}
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if (lastModified > 0) {
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headers.add("If-Modified-Since: " + DateTimeFormatter.RFC_1123_DATE_TIME.format(ZonedDateTime.ofInstant(Instant.ofEpochMilli(lastModified), ZoneOffset.UTC)));
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}
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return "Fetch resource: " + url + (headers.isEmpty() ? "" : " " + headers);
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};
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}
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private WebRequest() {
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throw new UnsupportedOperationException();
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}
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}
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