Synnefo » Pithos

/*

 * Copyright (c) 2011 Greek Research and Technology Network

 */

package gr.grnet.pithos.web.client;

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

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

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

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.List;

import com.google.gwt.core.client.GWT;

import com.google.gwt.dom.client.NativeEvent;

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

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

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

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

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

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

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

import com.google.gwt.http.client.URL;

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

import com.google.gwt.user.client.Event.NativePreviewEvent;

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

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

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

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

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

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

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

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

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

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

public class PermissionsAddDialog extends DialogBox {

        private MultiWordSuggestOracle oracle = new MultiWordSuggestOracle();

        private SuggestBox suggestBox = new SuggestBox(oracle);

        private String selectedUser = null;

        private List<GroupResource> groups;

        private ListBox groupBox = new ListBox();

        private CheckBox read = new CheckBox();

        private CheckBox write = new CheckBox();

        private CheckBox modifyACL = new CheckBox();

        private final PermissionsList permList;

        boolean userAdd;

        public PermissionsAddDialog(List<GroupResource> _groups, PermissionsList _permList, boolean _userAdd) {

                groups = _groups;

                userAdd = _userAdd;

                permList = _permList;

                groupBox.getElement().setId("addPermission.dropDown");

                suggestBox.getElement().setId("addPermission.textBox");

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

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

                modifyACL.getElement().setId("addpermission.modify");

                for (GroupResource group : _groups)

                        groupBox.addItem(group.getName(), group.getName());

                final VerticalPanel panel = new VerticalPanel();

                final HorizontalPanel buttons = new HorizontalPanel();

                setWidget(panel);

                final FlexTable permTable = new FlexTable();

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

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

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

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

                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");

                if (userAdd) {

                        suggestBox.getTextBox().addFocusHandler(new FocusHandler() {

                                @Override

                                public void onFocus(FocusEvent event) {

                                        if (selectedUser != null && selectedUser.endsWith("@"))

                                                updateSuggestions();

                                }

                        });

                        suggestBox.addKeyUpHandler(new KeyUpHandler() {

                                @Override

                                public void onKeyUp(KeyUpEvent event) {

                                        // Ignore the arrow keys.

                                        int keyCode = event.getNativeKeyCode();

                                        if (keyCode == KeyCodes.KEY_UP ||

                                                        keyCode == KeyCodes.KEY_DOWN ||

                                                        keyCode == KeyCodes.KEY_LEFT ||

                                                        keyCode == KeyCodes.KEY_RIGHT)

                                                return;

                                        if (keyCode==KeyCodes.KEY_ESCAPE) {

                                                suggestBox.hideSuggestionList();

                                                return;

                                        }

                                        String text = suggestBox.getText().trim();

                                        // Avoid useless queries for keystrokes that do not modify

                                        // the text.

                                        if (text.equals(selectedUser))

                                                return;

                                        selectedUser = text;

                                        // Go to the server only if the user typed the @ character.

                                        if (selectedUser.endsWith("@"))

                                                updateSuggestions();

                                }

                        });

                        permTable.setWidget(1, 0, suggestBox);

                } else

                        permTable.setWidget(1, 0, groupBox);

                permTable.setWidget(1, 1, read);

                permTable.setWidget(1, 2, write);

                permTable.setWidget(1, 3, modifyACL);

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

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

                permTable.getFlexCellFormatter().setHorizontalAlignment(1, 2, HasHorizontalAlignment.ALIGN_CENTER);

                permTable.getFlexCellFormatter().setHorizontalAlignment(1, 3, HasHorizontalAlignment.ALIGN_CENTER);

                panel.add(permTable);

                final Button ok = new Button("OK", new ClickHandler() {

                        @Override

                        public void onClick(ClickEvent event) {

                                addPermission();

                                hide();

                        }

                });

                ok.getElement().setId("addPermission.button.ok");

                buttons.add(ok);

                buttons.setCellHorizontalAlignment(ok, HasHorizontalAlignment.ALIGN_CENTER);

                // Create the 'Cancel' button, along with a listener that hides the

                // dialog

                // when the button is clicked.

                final Button cancel = new Button("Cancel", new ClickHandler() {

                        @Override

                        public void onClick(ClickEvent event) {

                                hide();

                        }

                });

                cancel.getElement().setId("addPermission.button.cancel");

                buttons.add(cancel);

                buttons.setCellHorizontalAlignment(cancel, HasHorizontalAlignment.ALIGN_CENTER);

                buttons.setSpacing(8);

                buttons.addStyleName("pithos-TabPanelBottom");

                panel.add(buttons);

                panel.addStyleName("pithos-TabPanelBottom");

        }

        private void addPermission() {

                PermissionHolder perm = new PermissionHolder();

                if (userAdd) {

                        selectedUser = suggestBox.getText();

                        for(PermissionHolder p : permList.permissions)

                                if (selectedUser.equals(p.getUser())){

                                        GSS.get().displayError("User already has access to the resource");

                                        return;

                                }

                        perm.setUser(selectedUser);

                } else {

                        String groupId = groupBox.getValue(groupBox.getSelectedIndex());

                        GroupResource selected = null;

                        for (GroupResource g : groups)

                                if (g.getName().equals(groupId))

                                        selected = g;

                        if (selected == null)

                                return;

                        for(PermissionHolder p : permList.permissions)

                                if (selected.getName().equals(p.getGroup())){

                                        GSS.get().displayError("Group already has access to the resource");

                                        return;

                                }

                        perm.setGroup(selected.getName());

                }

                boolean readValue = read.getValue();

                boolean writeValue = write.getValue();

                boolean modifyValue = modifyACL.getValue();

                perm.setRead(readValue);

                perm.setWrite(writeValue);

                perm.setModifyACL(modifyValue);

                permList.addPermission(perm);

                permList.updateTable();

        }

        @Override

        protected void onPreviewNativeEvent(NativePreviewEvent preview) {

                super.onPreviewNativeEvent(preview);

                NativeEvent evt = preview.getNativeEvent();

                if (evt.getType().equals("keydown"))

                        // Use the popup's key preview hooks to close the dialog when either

                        // enter or escape is pressed.

                        switch (evt.getKeyCode()) {

                                case KeyCodes.KEY_ENTER:

                                        addPermission();

                                        hide();

                                        break;

                                case KeyCodes.KEY_ESCAPE:

                                        hide();

                                        break;

                        }

        }

        @Override

        public void center() {

                super.center();

                if (userAdd)

                        suggestBox.setFocus(true);

        }

        /**

         * Update the list of suggestions.

         */

        protected void updateSuggestions() {

                final GSS app = GSS.get();

                String query = selectedUser.substring(0, selectedUser.length()-1);

                GWT.log("Searching for " + query, null);

                GetCommand<UserSearchResource> eg = new GetCommand<UserSearchResource>(UserSearchResource.class,

                                        app.getApiPath() + "users/" + URL.encodeComponent(query), false, null) {

                        @Override

                        public void onComplete() {

                                suggestBox.hideSuggestionList();

                                oracle.clear();

                                UserSearchResource s = getResult();

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

                                        GWT.log("Found " + user.getUsername(), null);

                                        oracle.add(user.getUsername());

                                }

                                suggestBox.showSuggestionList();

                        }

                        @Override

                        public void onError(Throwable t) {

                                if(t instanceof RestException)

                                        app.displayError("Unable to perform search: "+((RestException)t).getHttpStatusText());

                                else

                                        app.displayError("System error while searching for users: "+t.getMessage());

                                GWT.log("", t);

                                DisplayHelper.log(t.getMessage());

                        }

                };

                DeferredCommand.addCommand(eg);

        }

}