<commit_before>/*
 * Copyright 2013 gitblit.com.
 *
 * 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.gitblit.auth;

import java.io.File;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.gitblit.Constants.AccountType;
import com.gitblit.IStoredSettings;
import com.gitblit.manager.IRuntimeManager;
import com.gitblit.manager.IUserManager;
import com.gitblit.models.TeamModel;
import com.gitblit.models.UserModel;
import com.gitblit.utils.ArrayUtils;
import com.gitblit.utils.StringUtils;

public abstract class AuthenticationProvider {

	public static NullProvider NULL_PROVIDER = new NullProvider();

    protected final Logger logger = LoggerFactory.getLogger(getClass());

    protected final String serviceName;

	protected File baseFolder;

	protected IStoredSettings settings;

	protected IRuntimeManager runtimeManager;

	protected IUserManager userManager;

	protected AuthenticationProvider(String serviceName) {
		this.serviceName = serviceName;
	}

	/**
	 * Returns the file object for the specified configuration key.
	 *
	 * @return the file
	 */
	public File getFileOrFolder(String key, String defaultFileOrFolder) {
		return runtimeManager.getFileOrFolder(key, defaultFileOrFolder);
	}

	public final void setup(IRuntimeManager runtimeManager, IUserManager userManager) {
		this.baseFolder = runtimeManager.getBaseFolder();
		this.settings = runtimeManager.getSettings();
		this.runtimeManager = runtimeManager;
		this.userManager = userManager;
		setup();
	}

	public String getServiceName() {
		return serviceName;
	}

	protected void setCookie(UserModel user, char [] password) {
		// create a user cookie
		if (StringUtils.isEmpty(user.cookie) && !ArrayUtils.isEmpty(password)) {
			user.cookie = StringUtils.getSHA1(user.username + new String(password));
		}
	}

	protected void updateUser(UserModel userModel) {
		// TODO implement user model change detection
		// account for new user and revised user

		// username
		// displayname
		// email address
		// cookie

		userManager.updateUserModel(userModel);
	}

	protected void updateTeam(TeamModel teamModel) {
		// TODO implement team model change detection
		// account for new team and revised team

		// memberships

		userManager.updateTeamModel(teamModel);
	}

	public abstract void setup();

	public abstract void stop();

	public abstract UserModel authenticate(String username, char[] password);

	public abstract AccountType getAccountType();

	/**
	 * Does the user service support changes to credentials?
	 *
	 * @return true or false
	 * @since 1.0.0
	 */
	public abstract boolean supportsCredentialChanges();

	/**
	 * Returns true if the user's display name can be changed.
	 *
	 * @param user
	 * @return true if the user service supports display name changes
	 */
	public abstract boolean supportsDisplayNameChanges();

	/**
	 * Returns true if the user's email address can be changed.<commit_msg>Setting up a checksum on user and team instances to lower connection delay<commit_after>/*
 * Copyright 2013 gitblit.com.
 *
 * 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.gitblit.auth;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.gitblit.Constants.AccountType;
import com.gitblit.IStoredSettings;
import com.gitblit.manager.IRuntimeManager;
import com.gitblit.manager.IUserManager;
import com.gitblit.models.TeamModel;
import com.gitblit.models.UserModel;
import com.gitblit.utils.ArrayUtils;
import com.gitblit.utils.StringUtils;

public abstract class AuthenticationProvider {

	public static NullProvider NULL_PROVIDER = new NullProvider();

    protected final Logger logger = LoggerFactory.getLogger(getClass());

    protected final String serviceName;

	protected File baseFolder;

	protected IStoredSettings settings;

	protected IRuntimeManager runtimeManager;

	protected IUserManager userManager;

	protected AuthenticationProvider(String serviceName) {
		this.serviceName = serviceName;
	}

	/**
	 * Returns the file object for the specified configuration key.
	 *
	 * @return the file
	 */
	public File getFileOrFolder(String key, String defaultFileOrFolder) {
		return runtimeManager.getFileOrFolder(key, defaultFileOrFolder);
	}

	public final void setup(IRuntimeManager runtimeManager, IUserManager userManager) {
		this.baseFolder = runtimeManager.getBaseFolder();
		this.settings = runtimeManager.getSettings();
		this.runtimeManager = runtimeManager;
		this.userManager = userManager;
		setup();
	}

	public String getServiceName() {
		return serviceName;
	}

	protected void setCookie(UserModel user, char [] password) {
		// create a user cookie
		if (StringUtils.isEmpty(user.cookie) && !ArrayUtils.isEmpty(password)) {
			user.cookie = StringUtils.getSHA1(user.username + new String(password));
		}
	}

	/**
	 * Utility method to calculate the checksum of an object.
	 * @param sourceObject The object from which to establish the checksum.
	 * @return The checksum
	 * @throws IOException
	 * @throws NoSuchAlgorithmException
	 */
	private BigInteger checksum(Object sourceObject) throws IOException, NoSuchAlgorithmException {

	    if (sourceObject == null) {
	      return BigInteger.ZERO;   
	    }

	    ByteArrayOutputStream baos = new ByteArrayOutputStream();
	    ObjectOutputStream oos = new ObjectOutputStream(baos);
	    oos.writeObject(sourceObject);
	    oos.close();

	    MessageDigest m = MessageDigest.getInstance("SHA1");
	    m.update(baos.toByteArray());

	    return new BigInteger(1, m.digest());
	}
	
	protected void updateUser(UserModel userModel) {
		final UserModel userLocalDB = userManager.getUserModel(userModel.getName());
		try {
			// Establish the checksum of the current version of the user
			final BigInteger userCurrentCheck = checksum(userModel);
			// Establish the checksum of the stored version of the user
			final BigInteger userLocalDBcheck = checksum(userLocalDB);
			// Compare the checksums
			if (!userCurrentCheck.equals(userLocalDBcheck))
			{
				// If mismatch, save the new instance.
				userManager.updateUserModel(userModel);
			}
		} catch (NoSuchAlgorithmException | IOException e) {
			// Trace any potential error.
			if (logger.isErrorEnabled()) {
				logger.error(e.getMessage());
			}
		}
	}

	protected void updateTeam(TeamModel teamModel) {
		final TeamModel teamLocalDB = userManager.getTeamModel(teamModel.name);
		try {
			// Establish the checksum of the current version of the team
			final BigInteger teamCurrentCheck = checksum(teamModel);
			// Establish the checksum of the stored version of the team
			final BigInteger teamLocalDBcheck = checksum(teamLocalDB);
			// Compare the checksums
			if (!teamCurrentCheck.equals(teamLocalDBcheck))
			{
				// If mismatch, save the new instance.
				userManager.updateTeamModel(teamModel);
			}
		} catch (NoSuchAlgorithmException | IOException e) {
			// Trace any potential error.
			if (logger.isErrorEnabled()) {
				logger.error(e.getMessage());
			}
		}
	}

	public abstract void setup();

	public abstract void stop();

	public abstract UserModel authenticate(String username, char[] password);

	public abstract AccountType getAccountType();

	/**
	 * Does the user service support changes to credentials?
	 *
	 * @return true or false
	 * @since 1.0.0
	 */
	public abstract boolean supportsCredentialChanges();

	/**
	 * Returns true if the user's display name can be changed.
	 *
	 * @param user
	 * @return true if the user service supports display name changes
	 */
	public abstract boolean supportsDisplayNameChanges();

	/**
	 * Returns true if the user's email address can be changed.
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