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/**
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* '$RCSfile$'
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* Copyright: 2000 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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*
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* '$Author: Serhan AKIN $'
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* '$Date: 2009-07-15 10:54:27 +0300 $'
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package edu.ucsb.nceas.metacat.client.rest;
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import java.io.BufferedReader;
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import java.io.FileWriter;
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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.OutputStreamWriter;
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import java.io.Reader;
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import java.io.StringReader;
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import java.io.Writer;
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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.util.Vector;
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import org.w3c.dom.Node;
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import org.w3c.dom.NodeList;
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import edu.ucsb.nceas.metacat.client.DocumentNotFoundException;
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import edu.ucsb.nceas.metacat.client.InsufficientKarmaException;
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import edu.ucsb.nceas.metacat.client.MetacatAuthException;
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import edu.ucsb.nceas.metacat.client.MetacatException;
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import edu.ucsb.nceas.metacat.client.MetacatInaccessibleException;
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import edu.ucsb.nceas.utilities.IOUtil;
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import edu.ucsb.nceas.utilities.XMLUtilities;
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public class MetacatRestClient implements MetacatRest {
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/** The session identifier for the session */
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private String sessionId;
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/** The URL string for the metacat REST API*/
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private String contextRootUrl;
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/**
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* Constructor to create a new instance.
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*/
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public MetacatRestClient(String contextRootUrl){
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setContextRootUrl(contextRootUrl);
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}
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/**
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* Method used to log in to a metacat server through REST API. Implementations will need
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* to cache a cookie value to make the session persistent. Each time a
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* call is made to one of the other methods (e.g., read), the cookie will
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* need to be passed back to the metacat server along with the request.
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*
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* @param username the username of the user, like an LDAP DN
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* @param password the password for that user for authentication
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* @return the response string from metacat in XML format
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* @throws MetacatAuthException when the username/password could
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* not be authenticated
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*/
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public String login(String username, String password)
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throws MetacatAuthException, MetacatInaccessibleException {
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String urlParams = FUNCTION_KEYWORD+"="+FUNCTION_NAME_LOGIN;
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String postData = "username="+username+"&password="+password;
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String response = null;
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try {
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response = sendData(RESOURCE_SESSION, POST, urlParams, postData, "application/x-www-form-urlencoded", null, null);
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} catch (Exception e) {
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throw new MetacatInaccessibleException(e.getMessage());
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}
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if (response.indexOf("<login>") == -1) {
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setSessionId("");
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throw new MetacatAuthException(response);
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} else {
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int start = response.indexOf("<sessionId>") + 11;
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int end = response.indexOf("</sessionId>");
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if ((start != -1) && (end != -1)) {
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setSessionId(response.substring(start,end));
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}
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}
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return response;
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}
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/**
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* Method used to log out a metacat server. The Metacat server will end
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* the session when this call is invoked.
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*
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* @return the response string from metacat in XML format
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* @throws MetacatInaccessibleException when the metacat server can not be
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* reached or does not respond
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*/
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public String logout()throws MetacatInaccessibleException,MetacatException {
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String urlParams = FUNCTION_KEYWORD+"="+FUNCTION_NAME_LOGOUT ;
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String postData = "sessionid="+sessionId;
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String response;
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try {
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response = sendData(RESOURCE_SESSION, POST, urlParams, postData,"application/x-www-form-urlencoded", null, null);
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} catch (Exception e) {
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throw new MetacatInaccessibleException(e.getMessage());
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}
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return response;
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}
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/**
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* Read a public XML document , accessed by docid, and returned as a Reader.
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*
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* @param docid the identifier of the document to be read
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* @param outputFile name of the file to be written to local (optional)
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* @return a Reader for accessing the document
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* @throws InsufficientKarmaException when the user has insufficent rights
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* for the operation
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* @throws MetacatInaccessibleException when the metacat server can not be
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* reached or does not respond
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* @throws MetacatException when the metacat server generates another error
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*/
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public Reader getObject(String docid, String outFile) throws InsufficientKarmaException,
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MetacatInaccessibleException, DocumentNotFoundException, MetacatException{
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String resource = RESOURCE_OBJECTS+"/"+docid;
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try {
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String response = sendData(resource, GET, null, null, null, null, outFile);
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if (response != null ) {
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if (response != null && response.indexOf("<error>") != -1) {
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if (response.indexOf("does not have permission") != -1) {
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throw new InsufficientKarmaException(response);
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} else if(response.indexOf("does not exist") != -1) {
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throw new DocumentNotFoundException(response);
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} else {
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throw new MetacatException(response);
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}
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} else {
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return new StringReader(response);
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}
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} else
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throw new MetacatException(response);
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} catch(IOException ioe){
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throw new MetacatInaccessibleException(ioe.getMessage());
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}
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}
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/**
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* Read XML document from server session, accessed by docid, and returned as a Reader.
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*
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* @param docid the identifier of the document to be read
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* @param outputFile name of the file to be written to local (optional)
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* @return a Reader for accessing the document
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* @throws InsufficientKarmaException when the user has insufficent rights
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* for the operation
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* @throws MetacatInaccessibleException when the metacat server can not be
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* reached or does not respond
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* @throws MetacatException when the metacat server generates another error
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*/
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public Reader authenticatedGetObject(String docid, String outFile) throws InsufficientKarmaException,
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MetacatInaccessibleException, DocumentNotFoundException, MetacatException{
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String resource = RESOURCE_OBJECTS+"/"+docid;
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try {
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String response = sendData(resource, GET, "sessionid="+sessionId, null, null, null, outFile);
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if (response != null ) {
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if (response != null && response.indexOf("<error>") != -1) {
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if (response.indexOf("does not have permission") != -1) {
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throw new InsufficientKarmaException(response);
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} else if(response.indexOf("does not exist") != -1) {
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throw new DocumentNotFoundException(response);
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} else {
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throw new MetacatException(response);
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}
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} else {
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return new StringReader(response);
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}
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} else
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throw new MetacatException(response);
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} catch(IOException ioe){
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throw new MetacatInaccessibleException(ioe.getMessage());
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}
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}
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/**
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* Query the metacat document store with the given Ecogrid-compatible
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* query document and return the Ecogrid result set as a Reader.
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*
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* @param xmlQuery a Reader for accessing the XML version of the query
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* @return a Reader for accessing the result set
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*/
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public Reader query(Reader xmlQuery) throws MetacatInaccessibleException,IOException {
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String response = null;
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try{
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response = sendData(RESOURCE_OBJECTS, POST, null, null, "text/xml", xmlQuery, null);
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} catch (Exception e) {
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e.printStackTrace();
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throw new MetacatInaccessibleException(e.getMessage());
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}
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if (response != null)
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return new StringReader(response);
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return null;
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}
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/**
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* Query (as an authenticated user) the metacat document store with the given Ecogrid-compatible
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* query document and return the Ecogrid result set as a Reader.
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*
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* @param xmlQuery a Reader for accessing the XML version of the query
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* @return a Reader for accessing the result set
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*/
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public Reader authenticatedQuery(Reader xmlQuery) throws MetacatInaccessibleException,IOException {
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String response = null;
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try{
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response = sendData(RESOURCE_OBJECTS, POST, "sessionid="+sessionId, null, "text/xml", xmlQuery, null);
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} catch (Exception e) {
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e.printStackTrace();
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throw new MetacatInaccessibleException(e.getMessage());
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}
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if (response != null)
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return new StringReader(response);
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return null;
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}
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/**
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* Put (Insert/Update) an XML document into the repository.
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*
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* @param docid the docid to insert the document
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* @param xmlDocument a Reader for accessing the XML document to be inserted
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* @param isInsert whether the operation is update or insert
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*
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*
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* @return the metacat response message
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* @throws InsufficientKarmaException when the user has insufficent rights
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* for the operation
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* @throws MetacatInaccessibleException when the metacat server can not be
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* reached or does not respond
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* @throws MetacatException when the metacat server generates another error
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* @throws IOException when there is an error reading the xml document
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*/
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public String putObject(String docid, Reader xmlDocument, boolean isInsert)
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throws InsufficientKarmaException, MetacatException, IOException, MetacatInaccessibleException{
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String resource = RESOURCE_OBJECTS+"/"+docid;
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String urlParams = "sessionid="+sessionId+"&";
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if (isInsert)
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urlParams += FUNCTION_KEYWORD+"="+FUNCTION_NAME_INSERT;
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else
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urlParams += FUNCTION_KEYWORD+"="+FUNCTION_NAME_UPDATE;
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String response = null;
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try{
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response = sendData(resource, PUT, urlParams, null, "text/xml", xmlDocument, null);
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} catch (Exception e) {
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e.printStackTrace();
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throw new MetacatInaccessibleException(e.getMessage());
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}
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// Check for an error condition
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if (response.indexOf("<error>") != -1) {
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if (response.indexOf("does not have permission") != -1) {
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throw new InsufficientKarmaException(response);
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} else {
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throw new MetacatException(response);
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}
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}
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return response;
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}
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/**
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* Delete an XML document in the repository.
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*
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* @param docid the docid to delete
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* @return the metacat response message
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* @throws InsufficientKarmaException when the user has insufficent rights
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* for the operation
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* @throws MetacatInaccessibleException when the metacat server can not be
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* reached or does not respond
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* @throws MetacatException when the metacat server generates another error
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*/
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public String deleteObject(String docid)
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throws InsufficientKarmaException, MetacatException,MetacatInaccessibleException {
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String resource = RESOURCE_OBJECTS+"/"+docid;
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String urlParams = "sessionid="+sessionId+"&";
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String response = null;
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try{
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response = sendData(resource, DELETE, urlParams, null, null, null, null);
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} catch (Exception e) {
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e.printStackTrace();
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throw new MetacatInaccessibleException(e.getMessage());
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}
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// Check for an error condition
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if (response.indexOf("<error>") != -1) {
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if (response.indexOf("does not have permission") != -1) {
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throw new InsufficientKarmaException(response);
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} else {
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throw new MetacatException(response);
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}
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}
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return response;
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}
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/**
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* Return the highest document id for a given scope. This is used by
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* clients to make it easier to determine the next free identifier in a
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* sequence for a given scope.
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* @param scope String the scope to use for looking up the latest id
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* @throws MetacatException when an error occurs
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*/
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public String getNextObject(String scope) throws MetacatException {
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String lastIdentifier = "";
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String resource = RESOURCE_IDENTIFIER;
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String urlParams = FUNCTION_KEYWORD+"="+FUNCTION_NAME_GETNEXTOBJ;
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if (scope != null)
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urlParams += "&scope="+scope;
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String response = null;
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try {
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response = sendData(resource, GET, urlParams, null, null, null, null);
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// Check for an error condition
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if (response.indexOf("<error>") != -1) {
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throw new MetacatException(response);
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} else {
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Reader responseReader = new StringReader(response);
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Node root =
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XMLUtilities.getXMLReaderAsDOMTreeRootNode(responseReader);
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Node docidNode =
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XMLUtilities.getNodeWithXPath(root, "/lastDocid/docid");
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lastIdentifier = docidNode.getFirstChild().getNodeValue();
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}
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} catch (Exception e) {
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throw new MetacatException(e.getMessage());
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}
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return lastIdentifier;
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}
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/**
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* The method will return the latest revision in metacat server
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* for a given document id. If some error happens, this method will throw
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* an exception.
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* @param identifierId String the given docid you want to use. the docid it self
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* can have or haven't revision number
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* @throws MetacatException
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*/
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public int getNextRevision(String identifierId) throws MetacatException {
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int rev = 0;
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String resource = RESOURCE_IDENTIFIER+"/"+identifierId;
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String urlParams = FUNCTION_KEYWORD+"="+FUNCTION_NAME_GETNEXTREV;
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String response = null;
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try {
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response = sendData(resource, GET, urlParams, null, null, null, null);
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Reader responseReader = new StringReader(response);
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Node root =
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XMLUtilities.getXMLReaderAsDOMTreeRootNode(responseReader);
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Node docidNode =
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XMLUtilities.getNodeWithXPath(root, "/next-revision");
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rev = Integer.parseInt(docidNode.getFirstChild().getNodeValue());
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387
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// Check for an error condition
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if (response.indexOf("<error>") != -1 ) {
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throw new MetacatException(response);
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}
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} catch (Exception e) {
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e.printStackTrace();
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throw new MetacatException(e.getMessage());
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}
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return rev;
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}
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399
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400
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/**
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* return a list of all docids that match a given scope. if scope is null
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* return all docids registered in the system
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* @param scope String the scope to use to limit the docid query
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* @throws MetacatException when an error occurs
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*/
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public Vector<String> getAllDocids(String scope) throws MetacatException {
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407
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Vector<String> resultVec = new Vector<String>();
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408
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String resource = RESOURCE_IDENTIFIER;
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String urlParams = FUNCTION_KEYWORD+"="+FUNCTION_NAME_GETALLDOCS;
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if (scope != null)
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urlParams += "&scope="+scope;
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String response = null;
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try {
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response = sendData(resource, GET, urlParams, null, null, null, null);
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// Check for an error condition
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if (response.indexOf("<error>") != -1) {
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throw new MetacatException(response);
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} else {
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419
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Reader responseReader = new StringReader(response);
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Node root =
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XMLUtilities.getXMLReaderAsDOMTreeRootNode(responseReader);
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NodeList nlist = root.getChildNodes();
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for(int i=0; i<nlist.getLength(); i++) {
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Node n = nlist.item(i);
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425
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if(n.getNodeName().equals("docid")) {
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//add the content to the return vector
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427
|
String nodeVal = n.getFirstChild().getNodeValue();
|
428
|
resultVec.addElement(nodeVal);
|
429
|
}
|
430
|
}
|
431
|
|
432
|
}
|
433
|
} catch (Exception e) {
|
434
|
throw new MetacatException(e.getMessage());
|
435
|
}
|
436
|
return resultVec;
|
437
|
}
|
438
|
|
439
|
/**
|
440
|
* return true of the given docid is registered, false if not
|
441
|
* @param scope String the scope to use to limit the docid query
|
442
|
* @throws MetacatException when an error occurs
|
443
|
*/
|
444
|
public boolean isRegistered(String identifierId) throws MetacatException {
|
445
|
String resource = RESOURCE_IDENTIFIER+"/"+identifierId;
|
446
|
String urlParams = FUNCTION_KEYWORD+"="+FUNCTION_NAME_ISREGISTERED;
|
447
|
|
448
|
String response = null;
|
449
|
try {
|
450
|
response = sendData(resource, GET, urlParams, null, null, null, null);
|
451
|
// Check for an error condition
|
452
|
if (response.indexOf("<error>") != -1) {
|
453
|
throw new MetacatException(response);
|
454
|
} else {
|
455
|
Reader responseReader = new StringReader(response);
|
456
|
StringBuffer sb = new StringBuffer();
|
457
|
char[] c = new char[1024];
|
458
|
int numread = responseReader.read(c, 0, 1024);
|
459
|
while(numread != -1) {
|
460
|
sb.append(new String(c, 0, numread));
|
461
|
numread = responseReader.read(c, 0, 1024);
|
462
|
}
|
463
|
|
464
|
String responseStr = sb.toString();
|
465
|
if(responseStr.indexOf("true") != -1) {
|
466
|
return true;
|
467
|
}
|
468
|
return false;
|
469
|
}
|
470
|
} catch (Exception e) {
|
471
|
throw new MetacatException(e.getMessage());
|
472
|
}
|
473
|
}
|
474
|
|
475
|
/**
|
476
|
* Adds identifierId
|
477
|
* @param identifierId String the given docid you want to use.
|
478
|
* @throws MetacatException when an error occurs
|
479
|
*/
|
480
|
public String addLSID(String identifierId) throws MetacatException {
|
481
|
String resource = RESOURCE_IDENTIFIER+"/"+identifierId;
|
482
|
String response = null;
|
483
|
try {
|
484
|
response = sendData(resource, PUT, null, null, null, null, null);
|
485
|
} catch (Exception e) {
|
486
|
throw new MetacatException(e.getMessage());
|
487
|
}
|
488
|
return response;
|
489
|
}
|
490
|
|
491
|
public void setContextRootUrl(String contextRootUrl) {
|
492
|
if (!contextRootUrl.endsWith("/"))
|
493
|
contextRootUrl += "/";
|
494
|
this.contextRootUrl = contextRootUrl;
|
495
|
|
496
|
}
|
497
|
|
498
|
|
499
|
public String getSessionId() {
|
500
|
return sessionId;
|
501
|
}
|
502
|
|
503
|
|
504
|
public void setSessionId(String sessionId) {
|
505
|
this.sessionId = sessionId;
|
506
|
}
|
507
|
|
508
|
/**
|
509
|
* Send request to metacat REST API.
|
510
|
* @param resource Resource name to be accessed
|
511
|
* @param method HTTP verb, shoudl be one of GET,POST,DELETE,PUT
|
512
|
* @param urlParameters QueryString to be added to the end of server url
|
513
|
* @param postData QueryString to be printed to output stream
|
514
|
* @param contentType Content Type of the data to be posted. eg: "text/xml" or "application/x-www-form-urlencoded"
|
515
|
* @param postFileReader Reader of file to be posted
|
516
|
* @param outputFile File name to be saved returning from API
|
517
|
*/
|
518
|
private String sendData(String resource, String method, String urlParamaters,String postData, String contentType,
|
519
|
Reader postFileReader, String outputFile) throws IOException {
|
520
|
HttpURLConnection connection = null ;
|
521
|
|
522
|
String restURL = contextRootUrl+resource;
|
523
|
|
524
|
if (urlParamaters != null) {
|
525
|
if (restURL.indexOf("?") == -1)
|
526
|
restURL += "?";
|
527
|
restURL += urlParamaters;
|
528
|
}
|
529
|
|
530
|
URL u = new URL(restURL);
|
531
|
System.out.println("url:"+restURL+ " postData:"+postData);
|
532
|
URLConnection uc = u.openConnection();
|
533
|
connection= (HttpURLConnection) uc;
|
534
|
|
535
|
if (contentType!=null)
|
536
|
connection.setRequestProperty("Content-Type",contentType);
|
537
|
|
538
|
connection.setDoOutput(true);
|
539
|
connection.setDoInput(true);
|
540
|
connection.setRequestMethod(method);
|
541
|
|
542
|
if (!method.equals(GET)) {
|
543
|
if (postFileReader != null) {
|
544
|
postData = IOUtil.getAsString(postFileReader, true);
|
545
|
}
|
546
|
if (postData != null){
|
547
|
OutputStream out = connection.getOutputStream();
|
548
|
Writer wout = new OutputStreamWriter(out);
|
549
|
wout.write(postData);
|
550
|
wout.flush();
|
551
|
wout.close();
|
552
|
}
|
553
|
}
|
554
|
return readStream(connection.getInputStream(),outputFile);
|
555
|
}
|
556
|
|
557
|
/**
|
558
|
*
|
559
|
* Reads Input stream and return readed data, optionaly write the data to specified file
|
560
|
* */
|
561
|
private String readStream(InputStream is, String writeFile) throws IOException{
|
562
|
BufferedReader in = new BufferedReader(
|
563
|
new InputStreamReader(
|
564
|
is));
|
565
|
|
566
|
String inputLine;
|
567
|
StringBuffer b = new StringBuffer();
|
568
|
FileWriter writer = null;
|
569
|
if (writeFile!=null)
|
570
|
writer = new FileWriter(writeFile);
|
571
|
while ((inputLine = in.readLine()) != null) {
|
572
|
//System.out.println(inputLine+"\n");
|
573
|
b.append(inputLine+"\n");
|
574
|
if (writeFile!=null)
|
575
|
writer.write(inputLine);
|
576
|
}
|
577
|
if (writeFile!=null) {
|
578
|
writer.flush();
|
579
|
writer.close();
|
580
|
}
|
581
|
in.close();
|
582
|
return b.toString();
|
583
|
}
|
584
|
|
585
|
}
|