HandshakeUtil.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2015 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
package org.turro.financials.handshake;
 
import java.io.IOException;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.turro.elephant.context.ElephantContext;
import org.turro.elephant.direct.DirectContent;
import org.turro.elephant.direct.DirectContents;
import org.turro.elephant.direct.IDirectContent;
import org.turro.financials.entity.Contract;
import org.turro.financials.entity.ContractHandshake;
import org.turro.financials.entity.Document;
import org.turro.financials.entity.Product;
import org.turro.http.ElephantPost;
import org.turro.http.ElephantResponse;
import org.turro.http.ElephantResponseType;
 
@DirectContent(identifier="handshake")
public class HandshakeUtil implements IDirectContent {
 
  public static String getIdentifier() {
    return HandshakeUtil.class.getAnnotation(DirectContent.class).identifier();
  }
 
  @Override
  public boolean itsMe(String id) {
    return getIdentifier().equals(id);
  }
 
  @Override
  public boolean myTurn(HttpServletRequest request) {
    return DirectContents.isYourTurn(request, getIdentifier());
  }
 
  @Override
  public void execute(ServletContext context, HttpServletRequest request, HttpServletResponse response) {
    try {
      if(!ElephantPost.isValid(request)) return;
      Map<String, String[]> pars = request.getParameterMap();
      HandshakeAction ha = HandshakeAction.getAction(pars.containsKey("action") ? pars.get("action")[0] : null);
      HandshakeContract hc;
      switch(ha) {
        case HANDSHAKE_STATUS:
          hc = HandshakeContract.createHandshakeFromJson(pars.containsKey("contract") ? pars.get("contract")[0] : null);
          // check handshake
          HandshakeStatus status;
          if(hc == null) {
            status = HandshakeStatus.HS_NO_HANDSHAKE;
          } else {
            ContractHandshake ch = HandshakeContract.getContractHandshakeFromHandshake(hc);
            if(ch == null) {
              status = HandshakeStatus.HS_NO_HANDSHAKE;
            } else if(!ch.getContract().isActive()) {
              status = HandshakeStatus.HS_BROKEN;
            } else {
              status = HandshakeStatus.HS_ESTABLISHED;
            }
          }
          ElephantResponse.writeToResponse(response, ElephantResponseType.RESPONSE_CORRECT, "HANDSHAKE SERVER", status.toString());
          break;
        case HANDSHAKE_PETITION:
          hc = HandshakeContract.createHandshakeFromJson(pars.containsKey("contract") ? pars.get("contract")[0] : null);
          // save contractxxxx.hs 
          HandshakeContract.saveHandshakePetition(hc);
          status = HandshakeStatus.HS_NO_HANDSHAKE;
          ElephantResponse.writeToResponse(response, ElephantResponseType.RESPONSE_CORRECT, "HANDSHAKE SERVER: PETITION SEND", status.toString());
          break;
        case HANDSHAKE_ACCEPTANCE:
          hc = HandshakeContract.createHandshakeFromJson(pars.containsKey("contract") ? pars.get("contract")[0] : null);
          // update remoteId from handshake
          if(HandshakeContract.updateRemoteId(
                  pars.containsKey("remoteServer") ? pars.get("remoteServer")[0] : null, 
                  pars.containsKey("remoteId") ? pars.get("remoteId")[0] : null,
                  hc.remoteId)) {
            status = HandshakeStatus.HS_ESTABLISHED;
            ElephantResponse.writeToResponse(response, ElephantResponseType.RESPONSE_CORRECT, "HANDSHAKE SERVER: PETITION ACCEPTED", status.toString());
          } else {
            status = HandshakeStatus.HS_BROKEN;
            ElephantResponse.writeToResponse(response, ElephantResponseType.RESPONSE_FAILED, "HANDSHAKE SERVER: PETITION FAILED", status.toString());
          }
          break;
        case HANDSHAKE_DOCUMENT:
          HandshakeDocument hd = HandshakeDocument.createHandshakeFromJson(pars.containsKey("document") ? pars.get("document")[0] : null);
          if(hd != null) {
            HandshakeDocument.saveHandshakeDocument(hd);
            status = HandshakeStatus.HS_ESTABLISHED;
            ElephantResponse.writeToResponse(response, ElephantResponseType.RESPONSE_CORRECT, "HANDSHAKE SERVER: DOCUMENT ACCEPTED", status.toString());
          }
          break;
        case HANDSHAKE_PRODUCT:
          break;
      }
    } catch (IOException ex) {
      Logger.getLogger(HandshakeUtil.class.getName()).log(Level.SEVERE, ElephantContext.logMsg(null), ex);
    }
  }
 
  public static ElephantResponse checkStatus(Contract contract) {
    ContractHandshake handshake = contract.getContractHandshake();
    if(handshake != null) {
      try {
        ElephantPost ep = new ElephantPost(DirectContents.createURL(handshake.getRemoteServer(), getIdentifier()));
        ep.addParameter("contract", HandshakeContract.createJsonFromContract(contract));
        ep.addParameter("action", HandshakeAction.HANDSHAKE_STATUS.toString());
        return ep.doPost();
      } catch (IOException ex) {
        Logger.getLogger(HandshakeUtil.class.getName()).log(Level.SEVERE, ElephantContext.logMsg(null), ex);
      }
    }
    return null;
  }
  
  public static ElephantResponse sendPetition(Contract contract, String remoteUrl) {
    try {
      ElephantPost ep = new ElephantPost(DirectContents.createURL(remoteUrl, getIdentifier()));
      ep.addParameter("contract", HandshakeContract.createJsonFromContract(contract));
      ep.addParameter("action", HandshakeAction.HANDSHAKE_PETITION.toString());
      return ep.doPost();
    } catch (IOException ex) {
      Logger.getLogger(HandshakeUtil.class.getName()).log(Level.SEVERE, ElephantContext.logMsg(null), ex);
    }
    return null;
  }
  
  public static ElephantResponse sendAcceptance(Contract contract, String remoteServer, Long remoteId) {
    ContractHandshake handshake = contract.getContractHandshake();
    if(handshake != null) {
      try {
        ElephantPost ep = new ElephantPost(DirectContents.createURL(handshake.getRemoteServer(), getIdentifier()));
        ep.addParameter("remoteServer", remoteServer + "");
        ep.addParameter("remoteId", remoteId + "");
        ep.addParameter("contract", HandshakeContract.createJsonFromContract(contract));
        ep.addParameter("action", HandshakeAction.HANDSHAKE_ACCEPTANCE.toString());
        return ep.doPost();
      } catch (IOException ex) {
        Logger.getLogger(HandshakeUtil.class.getName()).log(Level.SEVERE, ElephantContext.logMsg(null), ex);
      }
    }
    return null;
  }
  
  public static ElephantResponse sendDocument(Document document) {
    Contract contract = document.getContract();
    ContractHandshake handshake = contract != null ? contract.getContractHandshake() : null;
    if(handshake != null) {
      try {
        ElephantPost ep = new ElephantPost(DirectContents.createURL(handshake.getRemoteServer(), getIdentifier()));
        ep.addParameter("document", HandshakeDocument.createJsonFromDocument(document));
        ep.addParameter("action", HandshakeAction.HANDSHAKE_DOCUMENT.toString());
        return ep.doPost();
      } catch (IOException ex) {
        Logger.getLogger(HandshakeUtil.class.getName()).log(Level.SEVERE, ElephantContext.logMsg(null), ex);
      }
    }
    return null;
  }
  
  public static ElephantResponse sendProduct(Contract contract, Product product) {
    ContractHandshake handshake = contract != null ? contract.getContractHandshake() : null;
    if(handshake != null) {
      try {
        ElephantPost ep = new ElephantPost(DirectContents.createURL(handshake.getRemoteServer(), getIdentifier()));
        ep.addParameter("contract", HandshakeContract.createJsonFromContract(contract));
        ep.addParameter("product", HandshakeProduct.createJsonFromProduct(product));
        ep.addParameter("action", HandshakeAction.HANDSHAKE_PRODUCT.toString());
        return ep.doPost();
      } catch (IOException ex) {
        Logger.getLogger(HandshakeUtil.class.getName()).log(Level.SEVERE, ElephantContext.logMsg(null), ex);
      }
    }
    return null;
  }
  
}