io.knotx.adapter.common.placeholders.UriTransformer.java Source code

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Here is the source code for io.knotx.adapter.common.placeholders.UriTransformer.java

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/*
 * Copyright (C) 2016 Cognifide Limited
 *
 * 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 io.knotx.adapter.common.placeholders;

import io.knotx.dataobjects.ClientRequest;
import io.vertx.core.logging.Logger;
import io.vertx.core.logging.LoggerFactory;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.nio.charset.UnsupportedCharsetException;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;
import org.apache.commons.lang3.StringUtils;

public final class UriTransformer {

    private static final Logger LOGGER = LoggerFactory.getLogger(UriTransformer.class);

    private static List<PlaceholderSubstitutor> placeholderSubstitutors = Arrays
            .asList(new RequestPlaceholderSubstitutor(), new UriPlaceholderSubstitutor());

    private UriTransformer() {
        // util
    }

    public static String resolveServicePath(String servicePath, ClientRequest request) {
        String serviceUri = servicePath;
        List<String> placeholders = getPlaceholders(servicePath);

        for (String placeholder : placeholders) {
            serviceUri = serviceUri.replace("{" + placeholder + "}",
                    encodeValue(getPlaceholderValue(request, placeholder)));
        }

        return serviceUri;
    }

    protected static List<String> getPlaceholders(String serviceUri) {
        return Arrays.asList(serviceUri.split("\\{")).stream().filter(str -> str.contains("}"))
                .map(str -> StringUtils.substringBefore(str, "}")).collect(Collectors.toList());
    }

    private static String getPlaceholderValue(ClientRequest request, String placeholder) {
        return placeholderSubstitutors.stream().map(substitutor -> substitutor.getValue(request, placeholder))
                .filter(Objects::nonNull).findFirst().orElse("");
    }

    private static String encodeValue(String value) {
        try {
            return URLEncoder.encode(value, "UTF-8").replace("+", "%20").replace("%2F", "/");
        } catch (UnsupportedEncodingException ex) {
            LOGGER.fatal("Unexpected Exception - Unsupported encoding UTF-8", ex);
            throw new UnsupportedCharsetException("UTF-8");
        }
    }
}