/*
* Copyright (C) 2012 The CyanogenMod Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.cyanogenmod.filemanager.commands.shell;
import com.cyanogenmod.filemanager.commands.IdentityExecutable;
import com.cyanogenmod.filemanager.console.CommandNotFoundException;
import com.cyanogenmod.filemanager.console.ExecutionException;
import com.cyanogenmod.filemanager.console.InsufficientPermissionsException;
import com.cyanogenmod.filemanager.model.AID;
import com.cyanogenmod.filemanager.model.Group;
import com.cyanogenmod.filemanager.model.Identity;
import com.cyanogenmod.filemanager.model.User;
import com.cyanogenmod.filemanager.util.FileHelper;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.StringReader;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.text.ParseException;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
/**
* A class for retrieve identity information of the current user
* (user associated to the active shell).
*
* {@link "http://unixhelp.ed.ac.uk/CGI/man-cgi?id"}
*/
//
//<user> <group> <groups>
//uid=2000(shell) gid=2000(shell) groups=1003(graphics),1004(input),...
//
public class IdentityCommand extends SyncResultProgram implements IdentityExecutable {
private static final String ID = "id"; //$NON-NLS-1$
private Identity mIdentity;
private static final String UID = "uid"; //$NON-NLS-1$
private static final String GID = "gid"; //$NON-NLS-1$
private static final String GROUPS = "groups"; //$NON-NLS-1$
/**
* Constructor of <code>IdentityCommand</code>.
*
* @throws InvalidCommandDefinitionException If the command has an invalid definition
*/
public IdentityCommand() throws InvalidCommandDefinitionException {
super(ID);
}
/**
* {@inheritDoc}
*/
@Override
public void parse(String in, String err) throws ParseException {
//Release the return object
this.mIdentity = null;
// Check the in buffer to extract information
BufferedReader br = null;
try {
br = new BufferedReader(new StringReader(in));
String szLine = br.readLine();
if (szLine == null) {
throw new ParseException("no information", 0); //$NON-NLS-1$
}
szLine = szLine.replaceAll(" ", FileHelper.NEWLINE); //$NON-NLS-1$
Properties p = new Properties();
p.load(new StringReader(szLine));
//At least uid and gid must be present
if (!p.containsKey(UID) && !p.containsKey(GID)) {
throw new ParseException(
String.format(
"no %s or %s present in %s", UID, GID, szLine), 0); //$NON-NLS-1$
}
//1.- Extract user
User user = (User)createAID(p.getProperty(UID), User.class);
//2.- Extract group
Group group = (Group)createAID(p.getProperty(GID), Group.class);
//3.- Extract groups
List<Group> groups = new ArrayList<Group>();
String szGroups = p.getProperty(GROUPS);
if (szGroups != null && szGroups.length() > 0) {
String[] aGroups = szGroups.split(","); //$NON-NLS-1$
int cc = aGroups.length;
for (int i = 0; i < cc; i++) {
groups.add((Group)createAID(aGroups[i], Group.class));
}
}
//Now the string is parsed into a reference
this.mIdentity = new Identity(user, group, groups);
} catch (IOException ioEx) {
throw new ParseException(ioEx.getMessage(), 0);
} catch (ParseException pEx) {
throw pEx;
} catch (Exception ex) {
throw new ParseException(ex.getMessage(), 0);
} finally {
try {
if (br != null) {
br.close();
}
} catch (Throwable ex) {
/**NON BLOCK**/
}
}
}
/**
* {@inheritDoc}
*/
@Override
public Identity getResult() {
return this.mIdentity;
}
/**
* {@inheritDoc}
*/
@Override
public void checkExitCode(int exitCode)
throws InsufficientPermissionsException, CommandNotFoundException, ExecutionException {
if (exitCode != 0) {
throw new ExecutionException("exitcode != 0"); //$NON-NLS-1$
}
}
/**
* Method that creates the {@link AID} from the parsed string.
*
* @param src The string to parsed into a {@link AID}
* @param clazz The {@link User} or {@link Group} class from which create the AID object
* @return AID The identity reference
* @throws ParseException If can't create the {@link AID} reference from the string
* @throws NoSuchMethodException If the constructor can not be found.
* @exception InstantiationException If the class cannot be instantiated
* @exception IllegalAccessException If this constructor is not accessible
* @exception InvocationTargetException If an exception was thrown by the invoked constructor
*/
@SuppressWarnings({ "unchecked", "static-method", "boxing" })
private AID createAID(String src, Class<?> clazz)
throws ParseException, NoSuchMethodException,
InstantiationException, IllegalAccessException, InvocationTargetException {
int id = 0;
try {
id = Integer.parseInt(src.substring(0, src.lastIndexOf('(')).trim());
} catch (NumberFormatException nfEx) {
throw new ParseException(String.format("not valid AID id: %s", src), 0); //$NON-NLS-1$
}
String szName = src.substring(src.lastIndexOf('(') + 1, src.lastIndexOf(')'));
Constructor<AID> constructor =
(Constructor<AID>)clazz.getConstructor(Integer.TYPE, String.class);
return constructor.newInstance(id, szName);
}
}