io.github.mike10004.vhs.HttpRequests Maven / Gradle / Ivy

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package io.github.mike10004.vhs;

import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.Multimap;
import io.github.mike10004.vhs.repackaged.org.apache.http.client.utils.URLEncodedUtils;

import javax.annotation.Nullable;
import java.net.URI;
import java.nio.charset.StandardCharsets;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Optional;
import java.util.stream.Stream;

class HttpRequests {

    private HttpRequests() {}

    /**
     * Creates a lowercase-keyed multimap from a list of headers.
     */
    public static  Multimap indexHeaders(Stream> entryHeaders) {
        Multimap headers = ArrayListMultimap.create();
        entryHeaders.forEach(header -> {
            headers.put(header.getKey().toLowerCase(), header.getValue());
        });
        return headers;
    }

    /**
     * Parses the query string of a URI and creates a multimap.
     * Map entries are created from parameters as follows:
     * 
     *     {@code key=value} becomes {@code (key, Optional.of(value))}
     *     {@code key=} becomes {@code (key, Optional.of("")}
     *     {@code key} becomes {@code (key, Optional.empty())}
     * 
     * @param uri the URI
     * @return the multimap
     */
    @Nullable
    public static Multimap> parseQuery(URI uri) {
        if (uri.getQuery() == null) {
            return null;
        }
        List> nvps = URLEncodedUtils.parse(uri, StandardCharsets.UTF_8);
        Multimap> mm = ArrayListMultimap.create();
        nvps.forEach(nvp -> {
            mm.put(nvp.getKey().toLowerCase(), Optional.ofNullable(nvp.getValue()));
        });
        return mm;
    }
}