no.arktekk.siren.field.WWWUrlEncodedFieldSerializer Maven / Gradle / Ivy

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package no.arktekk.siren.field;

import io.vavr.control.Option;
import net.hamnaberg.json.Json;
import no.arktekk.siren.Field;
import no.arktekk.siren.Fields;
import no.arktekk.siren.MIMEType;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.nio.charset.UnsupportedCharsetException;
import java.util.stream.Collectors;

public enum WWWUrlEncodedFieldSerializer implements FieldSerializer {
    INSTANCE;

    public Option serialize(MIMEType mimeType, Option fields) {
        return fields.filter(f -> MIMEType.URLEncoded.includedBy(mimeType)).map(fs -> fs.stream().map(this::format).collect(Collectors.joining("&")));
    }

    private String format(Field f) {
        return String.format("%s=%s", encode(f.name), encode(f.value.map(this::toString).getOrElse("")));
    }

    private String toString(Json.JValue jv) {
        return jv.fold(
                Json.JString::getValue,
                j -> String.valueOf(j.isValue()),
                j -> j.value.toString(),
                ignore -> {
                    throw new IllegalArgumentException("We do not support json objects");
                },
                ignore -> {
                    throw new IllegalArgumentException("We do not support json arrays");
                },
                () -> ""
                );
    }

    private String encode(String s) {
        try {
            return URLEncoder.encode(s, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            throw new UnsupportedCharsetException("UTF-8");
        }
    }
}