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Milton Community Edition: Supports DAV level 1 and is available on Apache2 license

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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.http11.auth;

import io.milton.http.Auth;
import io.milton.http.Auth.Scheme;
import io.milton.http.AuthenticationHandler;
import io.milton.http.Request;
import io.milton.resource.Resource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.List;

/**
 * @author brad
 */
public class BasicAuthHandler implements AuthenticationHandler {

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

    @Override
    public boolean credentialsPresent(Request request) {
        return request.getAuthorization() != null;
    }


    @Override
    public boolean supports(Resource r, Request request) {
        Auth auth = request.getAuthorization();
        if (auth == null) {
            log.trace("supports: no credentials provided");
            return false;
        }
        log.trace("supports: {}", auth.getScheme());
        boolean b = auth.getScheme().equals(Scheme.BASIC);
        if (b) {
            log.trace("supports: is BASIC auth scheme, supports = true");
        } else {
            log.trace("supports: is BASIC auth scheme, supports = false");
        }
        return b;
    }

    @Override
    public Object authenticate(Resource resource, Request request) {
        log.trace("authenticate");
        Auth auth = request.getAuthorization();
        Object o = resource.authenticate(auth.getUser(), auth.getPassword());
        log.trace("result: {}", o);
        return o;
    }

    @Override
    public void appendChallenges(Resource resource, Request request, List challenges) {
        if (resource == null) {
            throw new RuntimeException("Can't generate challenge because resource is null, so can't get realm");
        }
        challenges.add("Basic realm=\"" + resource.getRealm() + "\"");
    }

    @Override
    public boolean isCompatible(Resource resource, Request request) {
        return true;
    }
}