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HTTP request and response logging
There is a newer version: 1.9.0
package org.zalando.logbook;

/*
 * #%L
 * Logbook: Core
 * %%
 * Copyright (C) 2015 - 2016 Zalando SE
 * %%
 * 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.
 * #L%
 */

import java.util.Arrays;
import java.util.Collection;
import java.util.function.BiPredicate;
import java.util.function.Function;
import java.util.function.Predicate;

import static java.util.Collections.emptyList;
import static org.zalando.logbook.RequestURI.Component.AUTHORITY;
import static org.zalando.logbook.RequestURI.Component.PATH;
import static org.zalando.logbook.RequestURI.Component.SCHEME;
import static org.zalando.logbook.RequestURI.reconstruct;

public final class Conditions {

    Conditions() {
        // package private so we can trick code coverage
    }

    @SafeVarargs
    public static Predicate exclude(final Predicate... predicates) {
        return exclude(Arrays.asList(predicates));
    }

    public static Predicate exclude(final Collection> predicates) {
        return predicates.stream()
                .map(Predicate::negate)
                .reduce(Predicate::and)
                .orElse($ -> true);
    }

    public static Predicate requestTo(final String pattern) {
        final Predicate predicate = Glob.compile(pattern);

        return pattern.startsWith("/") ?
                requestTo(RawHttpRequest::getPath, predicate) :
                requestTo(request -> reconstruct(request, SCHEME, AUTHORITY, PATH), predicate);
    }

    private static Predicate requestTo(final Function extractor,
            final Predicate predicate) {
        return request -> predicate.test(extractor.apply(request));
    }

    // TODO(whiskeysierra): This should probably be more sophisticated, i.e. contains/compatibleWith
    public static Predicate contentType(final String contentType) {
        return request ->
                contentType.equals(request.getContentType());
    }

    public static Predicate header(final String key, final String value) {
        return request ->
                request.getHeaders().getOrDefault(key, emptyList()).contains(value);
    }

    public static Predicate header(final String key, final Predicate predicate) {
        return request ->
                request.getHeaders().get(key).stream().anyMatch(predicate);
    }

    public static Predicate header(final BiPredicate predicate) {
        return request ->
                request.getHeaders().entrySet().stream()
                        .anyMatch(e ->
                                e.getValue().stream().anyMatch(v -> predicate.test(e.getKey(), v)));
    }

}