Synnefo

/*

 * Copyright 2011 GRNET S.A. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or

 * without modification, are permitted provided that the following

 * conditions are met:

 *

 *   1. Redistributions of source code must retain the above

 *      copyright notice, this list of conditions and the following

 *      disclaimer.

 *

 *   2. Redistributions in binary form must reproduce the above

 *      copyright notice, this list of conditions and the following

 *      disclaimer in the documentation and/or other materials

 *      provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 *

 * The views and conclusions contained in the software and

 * documentation are those of the authors and should not be

 * interpreted as representing official policies, either expressed

 * or implied, of GRNET S.A.

 */

package gr.grnet.pithos.web.client;

import gr.grnet.pithos.web.client.FilePropertiesDialog.Images;

import gr.grnet.pithos.web.client.rest.GetCommand;

import gr.grnet.pithos.web.client.rest.resource.PermissionHolder;

import gr.grnet.pithos.web.client.rest.resource.UserResource;

import gr.grnet.pithos.web.client.rest.resource.UserSearchResource;

import java.util.HashSet;

import java.util.Set;

import com.google.gwt.event.dom.client.ClickEvent;

import com.google.gwt.event.dom.client.ClickHandler;

import com.google.gwt.user.client.DeferredCommand;

import com.google.gwt.user.client.ui.AbstractImagePrototype;

import com.google.gwt.user.client.ui.CheckBox;

import com.google.gwt.user.client.ui.Composite;

import com.google.gwt.user.client.ui.FlexTable;

import com.google.gwt.user.client.ui.HasHorizontalAlignment;

import com.google.gwt.user.client.ui.PushButton;

import com.google.gwt.user.client.ui.VerticalPanel;

public class PermissionsList extends Composite {

        int selectedRow = -1;

        int permissionCount = -1;

        Set<PermissionHolder> permissions = null;

        final Images images;

        final VerticalPanel permPanel = new VerticalPanel();

        final FlexTable permTable = new FlexTable();

        final String owner;

        PermissionHolder toRemove = null;

        private boolean hasChanges = false;

        private boolean hasAddition = false;

    private Pithos app;

        public PermissionsList(Pithos _app, final Images theImages, Set<PermissionHolder> thePermissions, String anOwner){

        app = _app;

                images = theImages;

                owner = anOwner;

                permissions =  new HashSet<PermissionHolder>();

                permissions.addAll(thePermissions);

                permTable.setText(0, 0, "Users/Groups");

                permTable.setText(0, 1, "Read");

                permTable.setText(0, 2, "Write");

                permTable.setText(0, 3, "Modify Access");

                permTable.setText(0, 4, "");

                permTable.getFlexCellFormatter().setStyleName(0, 0, "props-toplabels");

                permTable.getFlexCellFormatter().setStyleName(0, 1, "props-toplabels");

                permTable.getFlexCellFormatter().setStyleName(0, 2, "props-toplabels");

                permTable.getFlexCellFormatter().setStyleName(0, 3, "props-toplabels");

                permPanel.add(permTable);

                permPanel.addStyleName("pithos-TabPanelBottom");

                initWidget(permPanel);

                updateTable();

        }

        public boolean hasChanges(){

                return hasChanges || hasAddition;

        }

        public void updateTable(){

                copySetAndContinue(permissions);

        }

        public void updatePermissionsAccordingToInput(){

                int i=1;

                for(PermissionHolder dto : permissions){

                        /*if(dto.getId() == null)

                                hasChanges =true;*/

                        CheckBox r = (CheckBox) permTable.getWidget(i, 1);

                        CheckBox w = (CheckBox) permTable.getWidget(i, 2);

                        CheckBox m = (CheckBox) permTable.getWidget(i, 3);

                        r.getElement().setId("permissionList.read");

                        w.getElement().setId("permissionList.write");

                        m.getElement().setId("permissionList.modify");

                        if(dto.isRead() != r.getValue() || dto.isWrite() != w.getValue() || dto.isModifyACL() != m.getValue())

                                hasChanges = true;

                        dto.setRead(r.getValue());

                        dto.setWrite(w.getValue());

                        dto.setModifyACL(m.getValue());

                        i++;

                }                

        }

        /**

         * Retrieve the permissions.

         *

         * @return the permissions

         */

        public Set<PermissionHolder> getPermissions() {

                return permissions;

        }

        public void addPermission(PermissionHolder permission){

                permissions.add(permission);

                hasAddition = true;

        }

        /**

         * Copies the input Set to a new Set

         * @param input

         */

        private void copySetAndContinue(Set<PermissionHolder> input){

                Set<PermissionHolder> copiedInput = new HashSet<PermissionHolder>();                

                for(PermissionHolder dto : input) {

                        copiedInput.add(dto);

                }

                handleFullNames(copiedInput);

        }

        /**

         * Examines whether or not the user's full name exists in the 

         * userFullNameMap in the Pithos.java for every element of the input list.

         * If the user's full name does not exist in the map then a request is being made

         * for the specific username.  

         * 

         */

        private void handleFullNames(Set<PermissionHolder> aPermissions){                

                if(aPermissions.isEmpty()){

                        showPermissionTable();

                        return;

                }

                final PermissionHolder dto = aPermissions.iterator().next();

                if(dto.getGroup() != null){

                        if(aPermissions.size() >= 1){

                                aPermissions.remove(dto);                                

                                handleFullNames(aPermissions);                                

                        }

                }else if(app.findUserFullName(dto.getUser()) != null){

                        if(aPermissions.size() >= 1){

                                aPermissions.remove(dto);                                

                                handleFullNames(aPermissions);                                

                        }

                }else{

                        findFullNameAndUpdate(aPermissions);

                }

        }

        /**

         * Shows the permission table 

         * 

         */

        private void showPermissionTable(){

                int i = 1;

                if(toRemove != null){

                        permissions.remove(toRemove);

                        toRemove = null;

                }

                for(final PermissionHolder dto : permissions){

                        PushButton removeButton = new PushButton(AbstractImagePrototype.create(images.delete()).createImage(), new ClickHandler() {

                                @Override

                                public void onClick(ClickEvent event) {

                                        toRemove = dto;

                                        updateTable();

                                        hasChanges = true;

                                }

                        });

                        if(dto.getUser() != null){

                                if(dto.getUser() != null && dto.getUser().equals(owner)){

                                        permTable.setHTML(i, 0, "<span id=permissionList.Owner>" + AbstractImagePrototype.create(images.permUser()).getHTML() + "&nbsp;Owner</span>");

                                        removeButton.setVisible(false);

                                }else{

                                        permTable.setHTML(i, 0, "<span id=permissionList."+ app.findUserFullName(dto.getUser())+">"+ AbstractImagePrototype.create(images.permUser()).getHTML() + "&nbsp;"+ app.findUserFullName(dto.getUser()) + "</span>");

                                }

                        }else if(dto.getGroup() != null){

                                permTable.setHTML(i, 0, "<span id=permissionList."+dto.getGroup()+">" + AbstractImagePrototype.create(images.permGroup()).getHTML() + "&nbsp;"+ dto.getGroup() + "</span>");

                        }

                        CheckBox read = new CheckBox();

                        read.setValue(dto.isRead());

                        read.getElement().setId("permissionList.read");

                        CheckBox write = new CheckBox();

                        write.setValue(dto.isWrite());

                        write.getElement().setId("permissionList.write");

                        CheckBox modify = new CheckBox();

                        modify.setValue(dto.isModifyACL());

                        modify.getElement().setId("permissionList.modify");

                        if (dto.getUser()!=null && dto.getUser().equals(owner)) {

                                read.setEnabled(false);

                                write.setEnabled(false);

                                modify.setEnabled(false);

                        }

                        permTable.setWidget(i, 1, read);

                        permTable.setWidget(i, 2, write);

                        permTable.setWidget(i, 3, modify);

                        permTable.setWidget(i, 4, removeButton);

                        permTable.getFlexCellFormatter().setStyleName(i, 0, "props-labels");

                        permTable.getFlexCellFormatter().setHorizontalAlignment(i, 1, HasHorizontalAlignment.ALIGN_CENTER);

                        permTable.getFlexCellFormatter().setHorizontalAlignment(i, 2, HasHorizontalAlignment.ALIGN_CENTER);

                        permTable.getFlexCellFormatter().setHorizontalAlignment(i, 3, HasHorizontalAlignment.ALIGN_CENTER);

                        i++;                

                }

                for(; i<permTable.getRowCount(); i++)

                        permTable.removeRow(i);

                hasChanges = false;

        }

        /**

         * Makes a request to search for full name from a given username

         * and continues checking the next element of the Set.

         *  

         */

        private void findFullNameAndUpdate(final Set<PermissionHolder> aPermissions){                                

                final PermissionHolder dto = aPermissions.iterator().next();

                String path = app.getApiPath() + "users/" + dto.getUser();

                GetCommand<UserSearchResource> gg = new GetCommand<UserSearchResource>(app, UserSearchResource.class, path, false,null) {

                        @Override

                        public void onComplete() {

                                final UserSearchResource result = getResult();

                                for (UserResource user : result.getUsers()){

                                        String username = user.getUsername();

                                        String userFullName = user.getName();

                                        app.putUserToMap(username, userFullName);

                                        if(aPermissions.size() >= 1){

                                                aPermissions.remove(dto);                                                

                                                if(aPermissions.isEmpty()){

                                                        showPermissionTable();

                                                        return;

                                                }

                                                handleFullNames(aPermissions);                                                                                

                                        }                                                                        

                                }

                        }

                        @Override

                        public void onError(Throwable t) {                                

                                app.displayError("Unable to fetch user's full name from the given username " + dto.getUser());

                                if(aPermissions.size() >= 1){

                                        aPermissions.remove(dto);

                                        if(aPermissions.isEmpty()){

                                                showPermissionTable();

                                                return;

                                        }

                                        handleFullNames(aPermissions);

                                }

                        }

                };

                DeferredCommand.addCommand(gg);

        }

}