package kryshen.catalina.startup;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.regex.Pattern;
import org.apache.juli.logging.LogFactory;

/**
 *
 * @author Mikhail Kryshen
 */
public class PasswdUserConfig extends UserConfig {

    private static final String PASSWD_DATABASE = "passwd";

    /* Passwd format details. */
    private static final Pattern PASSWD_SPLIT_PATTERN = Pattern.compile(":");
    private static final int PASSWD_FIELD_USERNAME = 0;
    private static final int PASSWD_FIELD_HOME = 5;

    /**
     * Command for retrieving passwd database.
     */
    private String getent = null;

    /**
     * Path to local passwd file.
     */
    private String passwd = "/etc/passwd";

    public PasswdUserConfig() {
        log = LogFactory.getLog(PasswdUserConfig.class);
    }

    /**
     * Get command for retrieving passwd database.
     */
    public String getGetent() {
        return getent;
    }

    /**
     * Set command for retrieving passwd database.
     */
    public void setGetent(String getent) {
        this.getent = getent;
    }

    /**
     * Get path to local passwd file.
     */
    public String getPasswd() {
        return passwd;
    }

    /**
     * Set path to local passwd file.
     */
    public void setPasswd(String passwd) {
        this.passwd = passwd;
    }

    @Override
    protected void deployUserApps() {
        BufferedReader in;

        try {
            if (getent == null) {
                in = new BufferedReader(new FileReader(passwd));
            } else {
                Process process = Runtime.getRuntime().exec(
                        getent, new String[]{PASSWD_DATABASE});

                in = new BufferedReader(
                        new InputStreamReader(process.getInputStream()));
            }

            String line;

            try {
                while ((line = in.readLine()) != null) {
                    String[] fields = PASSWD_SPLIT_PATTERN.split(line);

                    String name = fields[PASSWD_FIELD_USERNAME];
                    File home = new File(fields[PASSWD_FIELD_HOME]);

                    if (!home.isDirectory()) {
                        log.error("Invalid home directory for user"
                                + name + ": " + home.getPath() + ".");
                        continue;
                    }

                    deployUserApps(name, home);
                }
            } finally {
                in.close();
            }
        } catch (IOException e) {
            log.error("Error reading passwd database.", e);
        } catch (ArrayIndexOutOfBoundsException e) {
            log.error("Invalid passwd format.", e);
        }
    }
}