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375 lines
17 KiB
375 lines
17 KiB
package net.yacy.http.servlets;
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import java.io.ByteArrayInputStream;
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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.StringWriter;
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import java.net.MalformedURLException;
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import java.net.URL;
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import java.net.URLDecoder;
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import java.util.HashMap;
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import java.util.StringTokenizer;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import javax.servlet.Servlet;
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import javax.servlet.ServletConfig;
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import javax.servlet.ServletException;
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import javax.servlet.ServletRequest;
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import javax.servlet.ServletResponse;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import net.yacy.cora.document.encoding.UTF8;
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import net.yacy.cora.document.id.DigestURL;
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import net.yacy.cora.document.id.MultiProtocolURL;
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import net.yacy.cora.protocol.ClientIdentification;
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import net.yacy.cora.protocol.Domains;
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import net.yacy.cora.protocol.HeaderFramework;
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import net.yacy.cora.protocol.RequestHeader;
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import net.yacy.cora.protocol.ResponseHeader;
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import net.yacy.cora.util.ConcurrentLog;
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import net.yacy.http.ProxyHandler;
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import net.yacy.kelondro.util.FileUtils;
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import net.yacy.search.Switchboard;
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import net.yacy.server.http.ChunkedInputStream;
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import net.yacy.server.http.HTTPDProxyHandler;
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import org.eclipse.jetty.continuation.Continuation;
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import org.eclipse.jetty.continuation.ContinuationSupport;
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import org.eclipse.jetty.http.HttpURI;
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import org.eclipse.jetty.servlets.ProxyServlet;
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/**
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* Servlet to implement proxy via url parameter "/proxy.html?url=xyz_urltoproxy"
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* this implementation uses the existing proxy functions from YaCy HTTPDProxyHandler
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*
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* functionality
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* - get parameters
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* - convert headers to YaCy style headers and parameters
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* - call existing HTTPDProxy
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* - revert response headers back from YaCy style to servlet specification
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* - handle rewrite of link (to point to proxy)
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* - send to client
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*
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* later improvemnts should/could use implementation to avoid back and forth converting
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* between YaCy and Servlet header/parameter style and use proxy implementation within
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* servlet specification or a existing reverse-proxy library.
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*
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*/
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public class YaCyProxyServlet extends ProxyServlet implements Servlet {
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@Override
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public void init(ServletConfig config) throws ServletException {
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super.init(config);
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// must be lower case (header names are internally converted to lower)
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_DontProxyHeaders.add("host"); // to prevent Host header setting from original servletrequest (which is localhost)
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}
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/* ------------------------------------------------------------ */
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@Override
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public void service (ServletRequest req, ServletResponse res) throws ServletException, IOException {
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final HttpServletRequest request = (HttpServletRequest) req;
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final HttpServletResponse response = (HttpServletResponse) res;
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if (!Switchboard.getSwitchboard().getConfigBool("proxyURL", false)) {
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response.sendError(HttpServletResponse.SC_FORBIDDEN,"proxy use not allowed. URL proxy globally switched off (see: Content Semantic -> Augmented Browsing -> URL proxy)");
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return;
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}
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final String remoteHost = req.getRemoteHost();
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if (!Domains.isThisHostIP(remoteHost)) {
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if (!proxyippatternmatch(remoteHost)) {
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response.sendError(HttpServletResponse.SC_FORBIDDEN,
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"proxy use not granted for IP " + remoteHost + " (see: Content Semantic -> Augmented Browsing -> Restrict URL proxy use filter)");
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return;
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}
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}
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if ("CONNECT".equalsIgnoreCase(request.getMethod())) {
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handleConnect(request, response);
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} else {
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final Continuation continuation = ContinuationSupport.getContinuation(request);
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if (!continuation.isInitial()) {
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response.sendError(HttpServletResponse.SC_GATEWAY_TIMEOUT); // Need better test that isInitial
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return;
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}
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URL proxyurl = null;
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String strARGS = request.getQueryString();
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if (strARGS == null) {
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response.sendError(HttpServletResponse.SC_NOT_FOUND,"url parameter missing");
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return;
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}
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if (strARGS.startsWith("url=")) {
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final String strUrl = strARGS.substring(4); // strip "url="
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try {
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proxyurl = new URL(strUrl);
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} catch (final MalformedURLException e) {
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proxyurl = new URL(URLDecoder.decode(strUrl, UTF8.charset.name()));
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}
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}
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if (proxyurl == null) {
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response.sendError(HttpServletResponse.SC_NOT_FOUND,"url parameter missing");
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return;
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}
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String hostwithport = proxyurl.getHost();
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if (proxyurl.getPort() != -1) {
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hostwithport += ":" + proxyurl.getPort();
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}
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RequestHeader yacyRequestHeader = ProxyHandler.convertHeaderFromJetty(request);
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yacyRequestHeader.remove(RequestHeader.KEEP_ALIVE);
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yacyRequestHeader.remove(HeaderFramework.CONTENT_LENGTH);
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final HashMap<String, Object> prop = new HashMap<String, Object>();
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prop.put(HeaderFramework.CONNECTION_PROP_HTTP_VER, HeaderFramework.HTTP_VERSION_1_1);
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prop.put(HeaderFramework.CONNECTION_PROP_HOST, hostwithport);
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prop.put(HeaderFramework.CONNECTION_PROP_PATH, proxyurl.getFile().replaceAll(" ", "%20"));
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prop.put(HeaderFramework.CONNECTION_PROP_REQUESTLINE, "PROXY");
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prop.put(HeaderFramework.CONNECTION_PROP_CLIENTIP, Domains.LOCALHOST);
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yacyRequestHeader.put(HeaderFramework.HOST, hostwithport );
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final ByteArrayOutputStream tmpproxyout = new ByteArrayOutputStream();
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HTTPDProxyHandler.doGet(prop, yacyRequestHeader, tmpproxyout, ClientIdentification.yacyProxyAgent);
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// reparse header to extract content-length and mimetype
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final ResponseHeader outgoingHeader = new ResponseHeader(200); //
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final InputStream proxyout = new ByteArrayInputStream(tmpproxyout.toByteArray());
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String line = readLine(proxyout);
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while (line != null && !line.equals("")) {
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int p;
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if ((p = line.indexOf(':')) >= 0) {
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// store a property
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outgoingHeader.add(line.substring(0, p).trim(), line.substring(p + 1).trim());
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}
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line = readLine(proxyout);
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}
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if (line == null) {
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response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,"Proxy Header missing");
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return;
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}
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final int httpStatus = Integer.parseInt((String) prop.get(HeaderFramework.CONNECTION_PROP_PROXY_RESPOND_STATUS));
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String directory = "";
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if (proxyurl.getPath().lastIndexOf('/') > 0) {
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directory = proxyurl.getPath().substring(0, proxyurl.getPath().lastIndexOf('/'));
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}
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if (response.getHeader(HeaderFramework.LOCATION) != null) {
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// rewrite location header
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String location = response.getHeader(HeaderFramework.LOCATION);
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if (location.startsWith("http")) {
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location = request.getServletPath() + "?url=" + location;
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} else {
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location = request.getServletPath() + "?url=http://" + hostwithport + "/" + location;
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}
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response.addHeader(HeaderFramework.LOCATION, location);
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}
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//final String mimeType = outgoingHeader.getContentType();
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final String mimeType = outgoingHeader.getContentType();
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if ((mimeType != null) && (mimeType.startsWith("text/html") || mimeType.startsWith("text"))) {
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final StringWriter buffer = new StringWriter();
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if (outgoingHeader.containsKey(HeaderFramework.TRANSFER_ENCODING)) {
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FileUtils.copy(new ChunkedInputStream(proxyout), buffer, UTF8.charset);
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} else {
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FileUtils.copy(proxyout, buffer, UTF8.charset);
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}
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final String sbuffer = buffer.toString();
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final Pattern p = Pattern.compile("(href=\"|src=\")([^\"]+)|(href='|src=')([^']+)|(url\\(')([^']+)|(url\\(\")([^\"]+)|(url\\()([^\\)]+)");
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final Matcher m = p.matcher(sbuffer);
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final StringBuffer result = new StringBuffer(80);
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final Switchboard sb = Switchboard.getSwitchboard();
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final String servletstub = request.getServletPath()+"?url=";
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while (m.find()) {
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String init = null;
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if (m.group(1) != null) { init = m.group(1); }
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if (m.group(3) != null) { init = m.group(3); }
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if (m.group(5) != null) { init = m.group(5); }
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if (m.group(7) != null) { init = m.group(7); }
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if (m.group(9) != null) { init = m.group(9); }
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String url = null;
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if (m.group(2) != null) { url = m.group(2); }
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if (m.group(4) != null) { url = m.group(4); }
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if (m.group(6) != null) { url = m.group(6); }
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if (m.group(8) != null) { url = m.group(8); }
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if (m.group(10) != null) { url = m.group(10); }
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if (url.startsWith("data:") || url.startsWith("#") || url.startsWith("mailto:") || url.startsWith("javascript:")) {
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String newurl = init + url;
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newurl = newurl.replaceAll("\\$", "\\\\\\$");
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m.appendReplacement(result, newurl);
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} else if (url.startsWith("http")) {
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// absoulte url of form href="http://domain.com/path"
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if (sb.getConfig("proxyURL.rewriteURLs", "all").equals("domainlist")) {
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try {
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if (sb.crawlStacker.urlInAcceptedDomain(new DigestURL(url)) != null) {
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continue;
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}
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} catch (final MalformedURLException e) {
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ConcurrentLog.fine("PROXY","ProxyServlet: malformed url for url-rewirte " + url);
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continue;
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}
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}
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String newurl = init + servletstub + url;
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newurl = newurl.replaceAll("\\$", "\\\\\\$");
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m.appendReplacement(result, newurl);
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} else if (url.startsWith("//")) {
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// absoulte url but same protocol of form href="//domain.com/path"
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final String complete_url = proxyurl.getProtocol() + ":" + url;
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if (sb.getConfig("proxyURL.rewriteURLs", "all").equals("domainlist")) {
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try {
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if (sb.crawlStacker.urlInAcceptedDomain(new DigestURL(complete_url)) != null) {
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continue;
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}
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} catch (MalformedURLException ex) {
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ConcurrentLog.fine("PROXY","ProxyServlet: malformed url for url-rewirte " + complete_url);
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continue;
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}
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}
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String newurl = init + servletstub + complete_url;
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newurl = newurl.replaceAll("\\$", "\\\\\\$");
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m.appendReplacement(result, newurl);
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} else if (url.startsWith("/")) {
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// absolute path of form href="/absolute/path/to/linked/page"
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String newurl = init + servletstub + "http://" + hostwithport + url;
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newurl = newurl.replaceAll("\\$", "\\\\\\$");
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m.appendReplacement(result, newurl);
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} else {
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// relative path of form href="relative/path"
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try {
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MultiProtocolURL target = new MultiProtocolURL("http://" + hostwithport + directory + "/" + url);
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String newurl = init + servletstub + target.toString();
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newurl = newurl.replaceAll("\\$", "\\\\\\$");
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m.appendReplacement(result, newurl);
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} catch (final MalformedURLException e) {}
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}
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}
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m.appendTail(result);
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byte[] sbb = UTF8.getBytes(result.toString());
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// add some proxy-headers to response header
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response.setContentType(outgoingHeader.getContentType());
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if (outgoingHeader.containsKey(HeaderFramework.SERVER)) {
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response.addHeader(HeaderFramework.SERVER, outgoingHeader.get(HeaderFramework.SERVER));
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}
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if (outgoingHeader.containsKey(HeaderFramework.DATE)) {
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response.addHeader(HeaderFramework.DATE, outgoingHeader.get(HeaderFramework.DATE));
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}
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if (outgoingHeader.containsKey(HeaderFramework.LAST_MODIFIED)) {
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response.addHeader(HeaderFramework.LAST_MODIFIED, outgoingHeader.get(HeaderFramework.LAST_MODIFIED));
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}
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if (outgoingHeader.containsKey(HeaderFramework.EXPIRES)) {
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response.addHeader(HeaderFramework.EXPIRES, outgoingHeader.get(HeaderFramework.EXPIRES));
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}
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response.setStatus(httpStatus);
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response.addIntHeader(HeaderFramework.CONTENT_LENGTH, sbb.length);
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response.getOutputStream().write(sbb);
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} else {
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if ((response.getHeader(HeaderFramework.CONTENT_LENGTH) == null) && prop.containsKey(HeaderFramework.CONNECTION_PROP_PROXY_RESPOND_SIZE)) {
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response.addHeader(HeaderFramework.CONTENT_LENGTH, (String) prop.get(HeaderFramework.CONNECTION_PROP_PROXY_RESPOND_SIZE));
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}
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response.setStatus(httpStatus);
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FileUtils.copy(proxyout, response.getOutputStream());
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}
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}
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}
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private String readLine(final InputStream in) throws IOException {
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final ByteArrayOutputStream buf = new ByteArrayOutputStream();
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int b;
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while ((b = in.read()) != '\r' && b != -1) {
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buf.write(b);
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}
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if (b == -1) {
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return null;
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}
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b = in.read(); // read \n
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if (b == -1) {
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return null;
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}
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return buf.toString("UTF-8");
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}
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/**
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* helper for proxy IP config pattern check
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*/
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private boolean proxyippatternmatch(final String key) {
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// the cfgippattern is a comma-separated list of patterns
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// each pattern may contain one wildcard-character '*' which matches anything
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final String cfgippattern = Switchboard.getSwitchboard().getConfig("proxyURL.access", "*");
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if (cfgippattern.equals("*")) {
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return true;
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}
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final StringTokenizer st = new StringTokenizer(cfgippattern, ",");
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String pattern;
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while (st.hasMoreTokens()) {
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pattern = st.nextToken();
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if (key.matches(pattern)) {
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return true;
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}
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}
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return false;
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}
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/**
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* get destination url (from query parameter &url=http://....)
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* override to prevent calculating destination url from request
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*
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* @param request
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* @param uri not used
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* @return destination url from query parameter &url=_destinationurl_
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* @throws MalformedURLException
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*/
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@Override
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protected HttpURI proxyHttpURI(HttpServletRequest request, String uri) throws MalformedURLException {
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String strARGS = request.getQueryString();
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if (strARGS.startsWith("action=")) {
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int detectnextargument = strARGS.indexOf("&");
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strARGS = strARGS.substring(detectnextargument + 1);
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}
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if (strARGS.startsWith("url=")) {
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final String strUrl = strARGS.substring(4); // strip url=
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try {
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URL newurl = new URL(strUrl);
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int port = newurl.getPort();
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if (port < 1) {
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port = newurl.getDefaultPort();
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}
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return proxyHttpURI(newurl.getProtocol(), newurl.getHost(), port, newurl.getPath());
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} catch (final MalformedURLException e) {
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ConcurrentLog.fine("PROXY", "url parameter missing");
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}
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}
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return null;
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}
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@Override
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public String getServletInfo() {
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return "YaCy Proxy Servlet";
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}
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}
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