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/**
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* '$RCSfile$'
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* Purpose: A Class that represents an document in remote metacat server
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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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* Authors: Jing Tao
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*
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* '$Author$'
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* '$Date$'
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* '$Revision$'
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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;
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8802
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leinfelder
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import edu.ucsb.nceas.metacat.client.MetacatClient;
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import edu.ucsb.nceas.metacat.client.MetacatFactory;
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import edu.ucsb.nceas.metacat.properties.PropertyService;
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import edu.ucsb.nceas.metacat.util.MetacatUtil;
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import javax.servlet.ServletOutputStream;
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import org.apache.log4j.Logger;
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import java.io.*;
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import java.net.*;
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import java.util.*;
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import java.util.zip.*;
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/**
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* A class represents a document in remote metacat server. During the
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* replication between two metacats, metadata (xml documents) might be
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* replicated from Metacat A to Metacat B. But data file didn't.
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* Sometime, user in Metacat B might query the data file which doesn't riside in
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* Metacat B. We need to download it from remote metacat server A and output it
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* to user. But it still doesn't reside in Metacat B.
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*/
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public class RemoteDocument
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{
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leinfelder
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private MetacatClient metacat = null;
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private String docIdWithoutRevision = null; //Docid for this document
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private String revision = null; // Reviseion number for this document
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private String dataSetId = null; // Data set document Id which contains
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// this document
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private String documentHomeServerURL = null; // Home metacat server url
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// for this document
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private String docType = null; //String to store docType
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private String userName = null; // User name to require this document
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private String passWord = null; // The user's passwd
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private String zipEntry = null; // For zip entry
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private String revisionAndDocType; // String to store this info
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private Logger logMetacat = Logger.getLogger(RemoteDocument.class);
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/**
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* Constructor of RemoteDcoument
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* @param myDocIdWithoutRevision, Docid for this document
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* @param myRevision, revision number for this document
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* @param myUserName, the user who require this document
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* @param myGroup, the gourps the user belong to
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* @param myPassWord, the password of the user
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* @param myOutPut, the output stream the document will be put
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* @param myZipEntryPath, the base line for zip entry
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*/
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public RemoteDocument ( String myDocIdWithoutRevision, String myRevision,
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String myUserName, String myPassWord, String myZipEntryPath)
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throws Exception
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{
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docIdWithoutRevision = myDocIdWithoutRevision;
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// Get data set id for the given docid
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dataSetId = DBUtil.findDataSetDocIdForGivenDocument(docIdWithoutRevision);
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documentHomeServerURL = getMetacatURLForGivenDocId(dataSetId);
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leinfelder
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// make sure we initialize the client for making remote calls
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this.metacat = (MetacatClient) MetacatFactory.createMetacatConnection(documentHomeServerURL);
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// Get revisionAndDocType
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getRevisionAndDocTypeString();
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revision = myRevision;
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// If rev is null or empty (user didn't specify it,
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// then set it current one in remote metacat
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if (revision == null ||revision.equals(""))
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{
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revision = setRevision();
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}
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docType = setDocType();
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userName = myUserName;
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passWord = myPassWord;
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zipEntry = myZipEntryPath+ docIdWithoutRevision +
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PropertyService.getProperty("document.accNumSeparator") + revision;
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}// Constructor
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/**
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* Method to get docidWithout revision
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*/
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public String getDocIdWithoutRevsion()
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{
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return docIdWithoutRevision;
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}//getDocIdWithoutRevsion
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/**
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* Method to get revsion
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*/
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public String getRevision()
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{
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return revision;
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}//getRevision
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/**
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* Method to get docType
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*/
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public String getDocType()
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{
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return docType;
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}//getDocType
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/**
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* Set revision if client didn't specify the revision number.
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* It come from revsionAndDocType String. This String look like "rev;doctype"
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* Rule:
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* 1) Get current revision number from remote metacat
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* 2) If couldn't get, set revision number 1
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*/
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private String setRevision()
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{
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// String to store the result
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String revision = null;
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// Int to store the index of ";" in revision
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int index = -1;
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// If String revisionAndDocType is null, revision set to 1
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if (revisionAndDocType == null || revisionAndDocType.equals(""))
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{
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revision = "1";
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}//if
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else
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{
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// Get the index of ";" in String revisionAndDocType
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index = revisionAndDocType.indexOf(";");
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// Get the subString about rev in String revisionAndDocType
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revision = revisionAndDocType.substring(0, index);
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// If revision is null or empty set revision 1
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if (revision == null || revision.equals(""))
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{
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revision = "1";
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}//if
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}//else
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return revision;
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}//setRevision
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/**
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* Set docType for this document base on the information from retmote metacat
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* It come from revsionAndDocType String. This String look like "rev;doctype"
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* If we couldn't get it from remote metacat, null will be set
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*/
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private String setDocType()
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{
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// String to store the result
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String remoteDocType = null;
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// Int to store the index of ";" in revision
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int index = -1;
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// If String revisionAndDocType is null, revision set to 1
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if (revisionAndDocType == null || revisionAndDocType.equals(""))
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{
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remoteDocType = null;
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}//if
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else
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{
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// Get the index of ";" in String revisionAndDocType
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index = revisionAndDocType.indexOf(";");
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// Get the subString about doctype in String revisionAndDocType
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remoteDocType = revisionAndDocType.substring(index+1);
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}//else
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return remoteDocType;
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}//setDocType
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/**
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* Method to get a metacat url for dataset document id.
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* First, get replication document home server for dataset document.
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* Second, transfer a doc home server from replication servlet to metacat
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* servlet. The reseaon is when we use read action to get the document, the
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* url is metacat servlet. Note: the protocol should be https. Because
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* replication is using https. If we use http and maybe access wrong port
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* number.
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* @param dataSetId, the document id for which we need to find metacat url
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*/
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private String getMetacatURLForGivenDocId( String givenDocId) throws Exception
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{
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// DocumentImpl object of this given docid
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DocumentImpl document = null;
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// Replication home server
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String replicationDocHomeServer = null;
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// String metacat url
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String metacatURL = null;
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// Check the given Docid is not null or empty
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if (givenDocId == null || givenDocId.equals(""))
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{
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throw new Exception ("Couldn't find a dataset docid for the required id");
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}
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// Create a documentImpl object
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daigle
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String accNumber = givenDocId + PropertyService.getProperty("document.accNumSeparator") +
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2641
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tao
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DBUtil.getLatestRevisionInDocumentTable(givenDocId);
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document = new DocumentImpl(accNumber, false);
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// get the replication home server (it come from xml_replication table)
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replicationDocHomeServer = document.getDocHomeServer();
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// If replication doc home server is local host. throws a exception
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if (replicationDocHomeServer.
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equals(MetacatUtil.getLocalReplicationServerName()))
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{
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throw new Exception ("Couldn't find the docid: "
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+docIdWithoutRevision+"."+revision);
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}//if
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// replicationDocHomeServer looks like
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// "pine.nceas.ucsb.edu:8443/tao/servlet/replication" and we should transfer
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// it to"https://pine.nceas.ucsb.edu:8443/tao/servlet/metacat"
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// get index of "replication" ocurrence
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int index = replicationDocHomeServer.indexOf("replication");
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// Get the subString from 0 to the index
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String subString = replicationDocHomeServer.substring(0, index);
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// Add https at head and append metacat
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metacatURL = "https://" + subString +"metacat";
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2663
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logMetacat.info("metacatURL: "+metacatURL);
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return metacatURL;
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}//getMetacatURLForGivenDocId
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/**
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* Method to get revisionAndDocType String from remote metacat
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*/
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private void getRevisionAndDocTypeString()
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{
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253 |
8802
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leinfelder
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254 |
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tao
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// Set property for login action
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Properties prop = new Properties();
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// Set action = getrevisionanddoctype
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prop.put("action", "getrevisionanddoctype");
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prop.put("docid", docIdWithoutRevision);
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// Now contact metacat and login.
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String response = getMetacatString(prop);
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// response contains error information
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if (response.indexOf("<error>")!=-1)
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{
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// Set response null
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response = null;
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}
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// Set revisionAndDocType equals reponse which get rid of white space
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if ( response != null)
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{
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revisionAndDocType = response.trim();
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}//if
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else
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{
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revisionAndDocType = response;
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}//else
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}//getRevisionAndDocTypeString
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/**
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* Method to read both xml and data file from remote server
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* and put the output into the given output stream
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* @param outPut, the serverlstoutputStream which the remote document or
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* data file need to put.
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*/
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public void readDocumentFromRemoteServer(ServletOutputStream outPut)
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throws Exception
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{
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// Set properties
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Properties prop = new Properties();
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// qformat set to be xml. Data file will be handle in MetaCatServlet class
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String qformat = "xml";
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// Action set to read
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String action = "read";
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// Input stream from remote metacat
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InputStream remoteResponse = null;
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// Check docIdWithoutRevision is not null or empty
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if (docIdWithoutRevision ==null || docIdWithoutRevision.equals(""))
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{
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throw new Exception("User didn't specify the required docid");
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}
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// User specified docid (including revision number
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String specifiedDocId = docIdWithoutRevision +
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daigle
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PropertyService.getProperty("document.accNumSeparator") +revision;
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2663
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sgarg
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logMetacat.info("The requried docid is: "+ specifiedDocId);
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tao
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// At first login to remote metacat server.
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logIn(userName, passWord);
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// Set action
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prop.put("action", action);
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// Set qformat xml
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prop.put("qformat", qformat);
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// Set the docid
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prop.put("docid", specifiedDocId);
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// Get remote metacat response
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try
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{
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remoteResponse = getMetacatInputStream(prop);
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}//try
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catch (Exception e)
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{
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// If has a exception throws it again
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throw e;
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}//catch
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// Read content from the remote input and write the content into
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// the given output
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byte[] buf = new byte[4 * 1024]; // 4K buffer
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// Read remote input into buffer
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int index = remoteResponse.read(buf);
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// If index is -1, this meams remote input ended
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while (index != -1)
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{
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// Write the content of butter to given output
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outPut.write(buf, 0, index);
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// Read next bytes to the buffer from remote input stream
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index = remoteResponse.read(buf);
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}//while
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// Close remote reponse
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if (remoteResponse != null)
|
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{
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remoteResponse.close();
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}//if
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351 |
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}//readDocumentFormRemoteServer
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352 |
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353 |
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354 |
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|
/**
|
355 |
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|
* Method to read both xml and data file from remote server by zip output
|
356 |
|
|
* and put the output into the given output stream
|
357 |
|
|
* @param outPut, the serverlstoutputStream which the remote document or
|
358 |
|
|
* data file need to put.
|
359 |
|
|
*/
|
360 |
|
|
public void readDocumentFromRemoteServerByZip(ZipOutputStream outPut)
|
361 |
|
|
throws Exception
|
362 |
|
|
{
|
363 |
|
|
// Set properties
|
364 |
|
|
Properties prop = new Properties();
|
365 |
|
|
// qformat set to be xml. Data file will be handle in MetaCatServlet class
|
366 |
|
|
String qformat = "xml";
|
367 |
|
|
// Action set to read
|
368 |
|
|
String action = "read";
|
369 |
|
|
// Input stream from remote metacat
|
370 |
|
|
InputStream remoteResponse = null;
|
371 |
|
|
|
372 |
|
|
// Check docIdWithoutRevision is not null or empty
|
373 |
|
|
if (docIdWithoutRevision ==null || docIdWithoutRevision.equals(""))
|
374 |
|
|
{
|
375 |
|
|
throw new Exception("User didn't specify the required docid");
|
376 |
|
|
}
|
377 |
|
|
// User specified docid (including revision number
|
378 |
|
|
String specifiedDocId = docIdWithoutRevision +
|
379 |
4212
|
daigle
|
PropertyService.getProperty("document.accNumSeparator") +revision;
|
380 |
2663
|
sgarg
|
logMetacat.info("The requried docid is: "+ specifiedDocId);
|
381 |
1292
|
tao
|
|
382 |
|
|
// At first login to remote metacat server.
|
383 |
|
|
logIn(userName, passWord);
|
384 |
|
|
|
385 |
|
|
// Set action
|
386 |
|
|
prop.put("action", action);
|
387 |
|
|
// Set qformat xml
|
388 |
|
|
prop.put("qformat", qformat);
|
389 |
|
|
// Set the docid
|
390 |
|
|
prop.put("docid", specifiedDocId);
|
391 |
|
|
|
392 |
|
|
// Get remote metacat response
|
393 |
|
|
try
|
394 |
|
|
{
|
395 |
|
|
remoteResponse = getMetacatInputStream(prop);
|
396 |
|
|
}//try
|
397 |
|
|
catch (Exception e)
|
398 |
|
|
{
|
399 |
|
|
// If has a exception throws it again
|
400 |
|
|
throw e;
|
401 |
|
|
}//catch
|
402 |
|
|
|
403 |
|
|
// Create a zip entry
|
404 |
|
|
ZipEntry zentry = new ZipEntry(zipEntry);
|
405 |
|
|
outPut.putNextEntry(zentry);
|
406 |
|
|
// Read content from the remote input and write the content into
|
407 |
|
|
// the given output
|
408 |
|
|
byte[] buf = new byte[4 * 1024]; // 4K buffer
|
409 |
|
|
// Read remote input into buffer
|
410 |
|
|
int index = remoteResponse.read(buf);
|
411 |
|
|
// If index is -1, this meams remote input ended
|
412 |
|
|
while (index != -1)
|
413 |
|
|
{
|
414 |
|
|
// Write the content of butter to given output
|
415 |
|
|
outPut.write(buf, 0, index);
|
416 |
|
|
// Read next bytes to the buffer from remote input stream
|
417 |
|
|
index = remoteResponse.read(buf);
|
418 |
|
|
}//while
|
419 |
|
|
// Close remote reponse
|
420 |
|
|
if (remoteResponse != null)
|
421 |
|
|
{
|
422 |
|
|
remoteResponse.close();
|
423 |
|
|
}//if
|
424 |
|
|
// Close zip entry
|
425 |
|
|
outPut.closeEntry();
|
426 |
|
|
|
427 |
|
|
}//readDocumentFormRemoteServerByZip
|
428 |
|
|
|
429 |
|
|
|
430 |
|
|
/**
|
431 |
|
|
* Method to do login action. set cookie for it
|
432 |
|
|
* @param usrerName, the DN name of the test method
|
433 |
|
|
* @param passWord, the passwd of the user
|
434 |
|
|
*/
|
435 |
|
|
private void logIn(String userName, String passWord)
|
436 |
|
|
{
|
437 |
|
|
// Make sure userName and password are not null
|
438 |
|
|
if ( userName == null || passWord == null ||
|
439 |
|
|
userName.equals("") || passWord.equals(""))
|
440 |
|
|
{
|
441 |
|
|
return;
|
442 |
|
|
}
|
443 |
|
|
// Set property for login action
|
444 |
|
|
Properties prop = new Properties();
|
445 |
|
|
prop.put("action", "login");
|
446 |
|
|
prop.put("qformat", "xml");
|
447 |
|
|
prop.put("username", userName);
|
448 |
|
|
prop.put("password", passWord);
|
449 |
|
|
|
450 |
|
|
// Now contact metacat and login.
|
451 |
|
|
String response = getMetacatString(prop);
|
452 |
2663
|
sgarg
|
logMetacat.info("Login Message: "+response);
|
453 |
1292
|
tao
|
}//login
|
454 |
|
|
|
455 |
|
|
/**
|
456 |
|
|
* Method to do logout action
|
457 |
|
|
*/
|
458 |
|
|
private void logOut()
|
459 |
|
|
{
|
460 |
|
|
// Set property
|
461 |
|
|
Properties prop = new Properties();
|
462 |
|
|
prop.put("action", "logout");
|
463 |
|
|
prop.put("qformat", "xml");
|
464 |
|
|
// Send it to remote metacat
|
465 |
|
|
String response = getMetacatString(prop);
|
466 |
2663
|
sgarg
|
logMetacat.debug("Logout Message: "+response);
|
467 |
1292
|
tao
|
// Set cookie to null
|
468 |
|
|
|
469 |
|
|
}//logout
|
470 |
|
|
|
471 |
|
|
/**
|
472 |
|
|
* Send a request to Metacat and the return is a string from remote
|
473 |
|
|
* Metacat.
|
474 |
|
|
* @param prop the properties to be sent to Metacat
|
475 |
|
|
*/
|
476 |
|
|
private String getMetacatString(Properties prop)
|
477 |
|
|
{
|
478 |
|
|
// Variable to store the response
|
479 |
|
|
String response = null;
|
480 |
|
|
|
481 |
|
|
// Now contact metacat and send the request
|
482 |
|
|
try
|
483 |
|
|
{
|
484 |
|
|
InputStreamReader returnStream =
|
485 |
|
|
new InputStreamReader(getMetacatInputStream(prop));
|
486 |
|
|
StringWriter sw = new StringWriter();
|
487 |
|
|
int len;
|
488 |
|
|
char[] characters = new char[512];
|
489 |
|
|
// Write inputstream into String
|
490 |
|
|
while ((len = returnStream.read(characters, 0, 512)) != -1)
|
491 |
|
|
{
|
492 |
|
|
sw.write(characters, 0, len);
|
493 |
|
|
}
|
494 |
|
|
// Close the input stream reader
|
495 |
|
|
returnStream.close();
|
496 |
|
|
// Transfer string writer to String
|
497 |
|
|
response = sw.toString();
|
498 |
|
|
// close string wirter
|
499 |
|
|
sw.close();
|
500 |
|
|
}
|
501 |
|
|
catch(Exception e)
|
502 |
|
|
{
|
503 |
2663
|
sgarg
|
logMetacat.error("Error in RemoteDocument.getMetacatString: "+
|
504 |
|
|
e.getMessage());
|
505 |
1292
|
tao
|
// If there is some exception return null
|
506 |
|
|
return null;
|
507 |
|
|
}
|
508 |
|
|
|
509 |
|
|
return response;
|
510 |
|
|
}// getMetaCatString
|
511 |
|
|
|
512 |
|
|
/**
|
513 |
|
|
* Send a request to Metacat and the return is a input stream from remote
|
514 |
|
|
* Metacat.
|
515 |
|
|
* @param prop the properties to be sent to Metacat
|
516 |
|
|
*/
|
517 |
|
|
private InputStream getMetacatInputStream(Properties prop) throws Exception
|
518 |
8802
|
leinfelder
|
{
|
519 |
1292
|
tao
|
// Variable to store the returned input stream
|
520 |
8802
|
leinfelder
|
InputStream returnStream = metacat.sendParameters(prop);
|
521 |
1292
|
tao
|
return returnStream;
|
522 |
|
|
|
523 |
|
|
}//getMetacatInputStream
|
524 |
|
|
|
525 |
|
|
}//Class RemoteDocument
|