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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 io.milton.http.fs;

import io.milton.http.Auth;
import io.milton.http.Request;
import io.milton.http.Request.Method;
import io.milton.http.http11.auth.DigestGenerator;
import io.milton.http.http11.auth.DigestResponse;
import io.milton.resource.Resource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Map;

/**
 * Has a realm and a map where the keys are user names and the values are
 * passwords
 *
 * @author brad
 */
public class SimpleSecurityManager implements io.milton.http.SecurityManager {

    private static final Logger log = LoggerFactory.getLogger(SimpleSecurityManager.class);

    private String realm;
    private Map nameAndPasswords;
    private DigestGenerator digestGenerator;

    public SimpleSecurityManager() {
        digestGenerator = new DigestGenerator();
    }

    public SimpleSecurityManager(DigestGenerator digestGenerator) {
        this.digestGenerator = digestGenerator;
    }

    public SimpleSecurityManager(String realm, Map nameAndPasswords) {
        this.realm = realm;
        this.nameAndPasswords = nameAndPasswords;
        digestGenerator = new DigestGenerator();
    }

    public Object getUserByName(String name) {
        String actualPassword = nameAndPasswords.get(name);
        if (actualPassword != null) {
            return name;
        }
        return null;
    }

    @Override
    public Object authenticate(String user, String password) {
        log.debug("authenticate: " + user + " - " + password);
        // user name will include domain when coming form ftp. we just strip it off
        if (user.contains("@")) {
            user = user.substring(0, user.indexOf("@"));
        }
        String actualPassword = nameAndPasswords.get(user);
        if (actualPassword == null) {
            log.debug("user not found: " + user);
            return null;
        } else {
            return (actualPassword.equals(password)) ? user : null;
        }
    }

    @Override
    public Object authenticate(DigestResponse digestRequest) {
        if (digestGenerator == null) {
            throw new RuntimeException("No digest generator is configured");
        }
        String actualPassword = nameAndPasswords.get(digestRequest.getUser());
        String serverResponse = digestGenerator.generateDigest(digestRequest, actualPassword);
        String clientResponse = digestRequest.getResponseDigest();

        if (serverResponse.equals(clientResponse)) {
            return "ok";
        } else {
            return null;
        }
    }

    @Override
    public boolean authorise(Request request, Method method, Auth auth, Resource resource) {
        if (auth == null) {
            log.trace("authorise: declining because there is no auth object");
            return false;
        } else {
            if (auth.getTag() == null) {
                log.trace("authorise: declining because there is no auth.getTag() object");
                return false;
            } else {
                log.trace("authorise: permitting because there is an authenticated user associated with this request");
                return true;
            }
        }
    }

    @Override
    public String getRealm(String host) {
        return realm;
    }

    /**
     * @param realm the realm to set
     */
    public void setRealm(String realm) {
        this.realm = realm;
    }

    public void setNameAndPasswords(Map nameAndPasswords) {
        this.nameAndPasswords = nameAndPasswords;
    }

    public void setDigestGenerator(DigestGenerator digestGenerator) {
        this.digestGenerator = digestGenerator;
    }

    @Override
    public boolean isDigestAllowed() {
        return digestGenerator != null;
    }

//    public MiltonUser getUserByName( String name, String domain ) {
//        log.debug( "getUserByName: " + name + " - " + domain);
//        String actualPassword = nameAndPasswords.get( name );
//        if( actualPassword == null ) return null;
//        return new MiltonUser( name, name, domain );
//    }

    public DigestGenerator getDigestGenerator() {
        return digestGenerator;
    }
}