org.gss_project.gss.web.client.rest.RestCommand.java Source code

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Here is the source code for org.gss_project.gss.web.client.rest.RestCommand.java

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/*
 * Copyright 2009 Electronic Business Systems Ltd.
 *
 * This file is part of GSS.
 *
 * GSS is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * GSS 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GSS.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.gss_project.gss.web.client.rest;

import org.gss_project.gss.web.client.GSS;
import org.gss_project.gss.web.client.SessionExpiredDialog;

import com.google.gwt.http.client.RequestBuilder;
import com.google.gwt.user.client.IncrementalCommand;

/**
 * @author kman
 */
public abstract class RestCommand implements IncrementalCommand {
    protected boolean showLoadingIndicator = true;

    protected void handleHeaders(String username, RequestBuilder requestBuilder, String path) {
        String date = getDate();
        requestBuilder.setHeader("X-GSS-Date", date);

        GSS app = GSS.get();
        String token = app.getToken();
        if (token == null)
            token = "aa";
        String resource = path.substring(app.getApiPath().length() - 1, path.length());
        String sig = calculateSig(requestBuilder.getHTTPMethod(), date, resource, base64decode(token));
        requestBuilder.setHeader("Authorization", username + " " + sig);
        requestBuilder.setHeader("Accept", "application/json; charset=utf-8");
    }

    protected void handleHeaders(RequestBuilder requestBuilder, String path) {
        if (GSS.get().getCurrentUserResource() != null) {
            String username = GSS.get().getCurrentUserResource().getUsername();
            handleHeaders(username, requestBuilder, path);
        } else
            GSS.get().displayError("no username");
    }

    public static native String getDate()/*-{
                                         return (new Date()).toUTCString();
                                         }-*/;

    public static native String getDate(Long ms)/*-{
                                                return (new Date(ms)).toUTCString();
                                                }-*/;

    public static native String calculateSig(String method, String date, String resource, String token)/*-{
                                                                                                       $wnd.b64pad = "=";
                                                                                                       var q = resource.indexOf('?');
                                                                                                       var res = q == -1? resource: resource.substring(0, q);
                                                                                                       var data = method + date + res;
                                                                                                       var sig = $wnd.b64_hmac_sha1(token, data);
                                                                                                       return sig;
                                                                                                       }-*/;

    public static native String base64decode(String encStr)/*-{
                                                           if (typeof atob === 'function') {
                                                           return atob(encStr);
                                                           }
                                                           var base64s = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
                                                           var bits;
                                                           var decOut = "";
                                                           var i = 0;
                                                           for(; i<encStr.length; i += 4){
                                                           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;
                                                           decOut += String.fromCharCode((bits & 0xff0000) >>16, (bits & 0xff00) >>8, bits & 0xff);
                                                           }
                                                           if(encStr.charCodeAt(i -2) == 61){
                                                           return(decOut.substring(0, decOut.length -2));
                                                           }
                                                           else if(encStr.charCodeAt(i -1) == 61){
                                                           return(decOut.substring(0, decOut.length -1));
                                                           }
                                                           else {
                                                           return(decOut);
                                                           }
                                                           }-*/;

    public void onComplete() {
    }

    public abstract void onError(Throwable t);

    public String fixPath(String pathToFix) {
        if (pathToFix.endsWith("/"))
            return pathToFix;
        return pathToFix + "/";
    }

    /**
     * Retrieve the showLoadingIndicator.
     *
     * @return the showLoadingIndicator
     */
    public boolean isShowLoadingIndicator() {
        return showLoadingIndicator;
    }

    /**
     * Modify the showLoadingIndicator.
     *
     * @param newShowLoadingIndicator the showLoadingIndicator to set
     */
    public void setShowLoadingIndicator(boolean newShowLoadingIndicator) {
        showLoadingIndicator = newShowLoadingIndicator;
    }

    static void sessionExpired() {
        SessionExpiredDialog dlg = new SessionExpiredDialog();
        dlg.center();
    }

}