code.grnet.gr Git - pithos/blob - src/gr/ebs/gss/client/rest/RestCommand.java

   1 /*
   2  * Copyright 2009 Electronic Business Systems Ltd.
   3  *
   4  * This file is part of GSS.
   5  *
   6  * GSS is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * GSS is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with GSS.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19 package gr.ebs.gss.client.rest;
  20
  21 import gr.ebs.gss.client.GSS;
  22 import gr.ebs.gss.client.SessionExpiredDialog;
  23
  24 import com.google.gwt.http.client.RequestBuilder;
  25 import com.google.gwt.user.client.IncrementalCommand;
  26
  27 /**
  28  * @author kman
  29  */
  30 public abstract class RestCommand implements IncrementalCommand {
  31         protected boolean showLoadingIndicator = true;
  32
  33         protected void handleHeaders(String username, RequestBuilder requestBuilder, String path){
  34                 String date = getDate();
  35                 requestBuilder.setHeader("X-GSS-Date", date);
  36
  37                 GSS app = GSS.get();
  38                 String token = app.getToken();
  39                 if (token == null)
  40                         token = "aa";
  41                 String resource = path.substring(app.getApiPath().length()-1,path.length());
  42                 String sig = calculateSig(requestBuilder.getHTTPMethod(), date, resource, base64decode(token));
  43                 requestBuilder.setHeader("Authorization", username + " " + sig);
  44                 requestBuilder.setHeader("Accept", "application/json; charset=utf-8");
  45                 requestBuilder.setHeader("Accept-Charset", "utf-8");
  46         }
  47
  48         protected void handleHeaders(RequestBuilder requestBuilder, String path) {
  49                 if (GSS.get().getCurrentUserResource() != null) {
  50                         String username = GSS.get().getCurrentUserResource().getUsername();
  51                         handleHeaders(username, requestBuilder, path);
  52                 } else
  53                         GSS.get().displayError("no username");
  54         }
  55
  56         public static native String getDate()/*-{
  57                 return (new Date()).toUTCString();
  58         }-*/;
  59
  60         public static native String calculateSig(String method, String date, String resource, String token)/*-{
  61                 $wnd.b64pad = "=";
  62                 var q = resource.indexOf('?');
  63                 var res = q == -1? resource: resource.substring(0, q);
  64                 var data = method + date + res;
  65                 var sig = $wnd.b64_hmac_sha1(token, data);
  66                 return sig;
  67         }-*/;
  68
  69         public static native String base64decode(String encStr)/*-{
  70                 if (typeof atob === 'function') {
  71            return atob(encStr);
  72         }
  73         var base64s = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  74         var bits;
  75         var decOut = "";
  76         var i = 0;
  77         for(; i<encStr.length; i += 4){
  78             bits = (base64s.indexOf(encStr.charAt(i)) & 0xff) <<18 | (base64s.indexOf(encStr.charAt(i +1)) & 0xff) <<12 | (base64s.indexOf(encStr.charAt(i +2)) & 0xff) << 6 | base64s.indexOf(encStr.charAt(i +3)) & 0xff;
  79             decOut += String.fromCharCode((bits & 0xff0000) >>16, (bits & 0xff00) >>8, bits & 0xff);
  80         }
  81         if(encStr.charCodeAt(i -2) == 61){
  82             return(decOut.substring(0, decOut.length -2));
  83         }
  84         else if(encStr.charCodeAt(i -1) == 61){
  85             return(decOut.substring(0, decOut.length -1));
  86         }
  87         else {
  88             return(decOut);
  89         }
  90         }-*/;
  91
  92         /**
  93          * An overridden RequestBuilder that allows us to use DELETE, HEAD and PUT methods.
  94          */
  95         protected class RestRequestBuilder extends RequestBuilder {
  96                 public RestRequestBuilder(String httpMethod, String url) {
  97                         super(httpMethod, url);
  98                 }
  99         }
 100
 101         public void onComplete(){}
 102
 103         public abstract void onError(Throwable t);
 104
 105         public String fixPath(String pathToFix){
 106                 if(pathToFix.endsWith("/"))
 107                         return pathToFix;
 108                 return pathToFix+"/";
 109         }
 110
 111         /**
 112          * Retrieve the showLoadingIndicator.
 113          *
 114          * @return the showLoadingIndicator
 115          */
 116         public boolean isShowLoadingIndicator() {
 117                 return showLoadingIndicator;
 118         }
 119
 120         /**
 121          * Modify the showLoadingIndicator.
 122          *
 123          * @param newShowLoadingIndicator the showLoadingIndicator to set
 124          */
 125         public void setShowLoadingIndicator(boolean newShowLoadingIndicator) {
 126                 showLoadingIndicator = newShowLoadingIndicator;
 127         }
 128
 129         static void sessionExpired(){
 130                 SessionExpiredDialog dlg = new SessionExpiredDialog();
 131                 dlg.center();
 132         }
 133
 134 }