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 *
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 *
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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
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 */

package com.sun.enterprise.admin.cli.cluster;

import java.io.*;
import java.util.Arrays;
import java.util.Map;
import java.util.HashMap;
import java.util.logging.Level;

import org.jvnet.hk2.annotations.*;
import org.jvnet.hk2.component.*;
import org.glassfish.api.Param;
import org.glassfish.api.admin.*;
import org.glassfish.internal.api.Globals;
import org.glassfish.cluster.ssh.launcher.SSHLauncher;
import org.glassfish.cluster.ssh.util.SSHUtil;

import com.sun.enterprise.universal.glassfish.TokenResolver;

/**
 *  This is a local command that distributes the SSH public key to remote node(s)
 *
 */
@Service(name = "setup-ssh")
@Scoped(PerLookup.class)
@ExecuteOn({RuntimeType.DAS})
public final class SetupSshKey extends SSHCommandsBase {
    @Param(optional = true)
    private String sshpublickeyfile;

    @Param(optional = true, defaultValue="false")
    private boolean generatekey;

    @Inject
    private Habitat habitat;

    public SetupSshKey() {
        // Create a resolver that can replace system properties in strings
        Map systemPropsMap =
                new HashMap((Map)(System.getProperties()));
        resolver = new TokenResolver(systemPropsMap);
    }

    /**
     */
    @Override
    protected void validate()
            throws CommandException {
        Globals.setDefaultHabitat(habitat);
        
        sshuser = resolver.resolve(sshuser);

        if (sshkeyfile == null) {
            //if user hasn't specified a key file and there is no key file at default
            //location, then generate one
            String existingKey = SSHUtil.getExistingKeyFile();
            if (existingKey == null) {
                sshkeyfile = SSHUtil.getDefaultKeyFile();
                if(promptForKeyGeneration()) {
                    generatekey=true;                 
                }
            } else {
                //there is a key that requires to be distributed, hence need password
                promptPass = true;
                sshkeyfile = existingKey;
                
                if(isEncryptedKey()) {
                    sshkeypassphrase=getSSHPassphrase(false);
                }
            }
        } else {
            validateKeyFile(sshkeyfile);
            if(isEncryptedKey()) {
                sshkeypassphrase=getSSHPassphrase(false);
            }
        }

        if (sshpublickeyfile != null) {
            validateKeyFile(sshpublickeyfile);
        }

    }

    /**
     */
    @Override
    protected int executeCommand()
            throws CommandException {

        SSHLauncher sshL=habitat.getComponent(SSHLauncher.class);

        String previousPassword = null;
        boolean status = false;
        for (String node : hosts) {
            sshL.init(sshuser, node,  sshport, sshpassword, sshkeyfile, sshkeypassphrase, logger);
            if (generatekey || promptPass) {
                //prompt for password iff required
                if (sshkeyfile != null || SSHUtil.getExistingKeyFile() != null) {
                    try {
                        if(sshL.checkConnection()) {
                            logger.info(Strings.get("SSHAlreadySetup", sshuser, node));
                            continue;
                        }
                    } catch (IOException ioe) {
                        //ignore
                    }
                }
                if (previousPassword != null) {
                    status = sshL.checkPasswordAuth();
                }
                if (!status) {
                    sshpassword=getSSHPassword(node);
                    previousPassword=sshpassword;
                }
            }
            try {
                sshL.setupKey(node, sshpublickeyfile, generatekey, sshpassword);
            } catch (IOException ce) {
                //logger.fine("SSH key setup failed: " + ce.getMessage());
                throw new CommandException(Strings.get("KeySetupFailed", ce.getMessage()));
            } catch (Exception e) {
                //handle KeyStoreException
            }

            boolean res = false;
            try {
                res = sshL.checkConnection();
            } catch (IOException ioe) {
                if (logger.isLoggable(Level.FINER)) {
                    ioe.printStackTrace();
                }
            }
            if (!res) {
                throw new CommandException(Strings.get("ConnFailed"));
            }
        }
        return SUCCESS;
    }

    /**
     * Method that sets the prompt flag only if key file exists
     * @param file the key file
     */
    private void validateKeyFile(String file) throws CommandException {
        //if key exists, set prompt flag
        File f = new File(file);
        if (f.exists()) {
            promptPass=true;
        } else {
            throw new CommandException(Strings.get("KeyDoesNotExist", file));
        }
    }

    /**
     * Prompt for key generation
     */
    private boolean promptForKeyGeneration() {
        if (generatekey)
            return true;
        
        if (!programOpts.isInteractive())
            return false;

        Console cons = System.console();

        if (cons != null) {
            String val = null;
            do {
                cons.printf("%s", Strings.get("GenerateKeyPairPrompt", sshuser, Arrays.toString(hosts)));
                val = cons.readLine();
                if (val != null && (val.equalsIgnoreCase("yes") || val.equalsIgnoreCase("y"))) {
                    if(logger.isLoggable(Level.FINER)) {
                        logger.finer("Generate key!");
                    }
                    return true;
                } else if ( val != null && (val.equalsIgnoreCase("no") || val.equalsIgnoreCase("n"))) {
                    break;
                }
            } while (val != null && !isValidAnswer(val));
        }
        return false;
    }
}