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A web service test double for all occasions - standalone edition
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/*
 * Copyright (C) 2011 Thomas Akehurst
 *
 * 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.github.tomakehurst.wiremock.common;

import com.github.tomakehurst.wiremock.http.QueryParameter;
import com.google.common.base.Joiner;
import com.google.common.base.Splitter;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableListMultimap;
import com.google.common.collect.Iterables;
import com.google.common.collect.Maps;

import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.net.URLDecoder;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;

import static com.github.tomakehurst.wiremock.common.Exceptions.throwUnchecked;
import static com.google.common.collect.FluentIterable.from;

public class Urls {

    public static Map splitQueryFromUrl(String url) {
        String queryPart = url.contains("?") && !url.endsWith("?") ?
            url.substring(url.indexOf('?') + 1) :
            null;

        return splitQuery(queryPart);
    }

    public static Map splitQuery(URI uri) {
        if (uri == null) {
            return Collections.emptyMap();
        }

        return splitQuery(uri.getRawQuery());
    }

    public static Map splitQuery(String query) {
        if (query == null) {
            return Collections.emptyMap();
        }

        Iterable pairs = Splitter.on('&').split(query);
        ImmutableListMultimap.Builder builder = ImmutableListMultimap.builder();
        for (String queryElement: pairs) {
            int firstEqualsIndex = queryElement.indexOf('=');
            if (firstEqualsIndex == -1) {
                builder.putAll(decode(queryElement), "");
            } else {
                String key = decode(queryElement.substring(0, firstEqualsIndex));
                String value = decode(queryElement.substring(firstEqualsIndex + 1));
                builder.putAll(key, value);
            }
        }

        return Maps.transformEntries(builder.build().asMap(), new Maps.EntryTransformer, QueryParameter>() {
            public QueryParameter transformEntry(String key, Collection values) {
                return new QueryParameter(key, ImmutableList.copyOf(values));
            }
        });
    }

    public static String getPath(String url) {
        return url.contains("?") ?
                url.substring(0, url.indexOf("?")) :
                url;
    }

    public static String urlToPathParts(URI uri) {
        Iterable uriPathNodes = Splitter.on("/").omitEmptyStrings().split(uri.getPath());
        int nodeCount = Iterables.size(uriPathNodes);

        return nodeCount > 0 ?
            Joiner.on("-")
            .join(from(uriPathNodes))
             :
            "";
    }

    public static String decode(String encoded) {
        try {
            return URLDecoder.decode(encoded, "utf-8");
        } catch (UnsupportedEncodingException e) {
            return throwUnchecked(e, String.class);
        }
    }

    public static URL safelyCreateURL(String url) {
        try {
            return new URL(url);
        } catch (MalformedURLException e) {
            return throwUnchecked(e, URL.class);
        }
    }
}