org.zodiac.netty.http.headers.AllowHeader Maven / Gradle / Ivy

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package org.zodiac.netty.http.headers;

import io.netty.handler.codec.http.HttpHeaderNames;
import io.netty.util.internal.AppendableCharSequence;

import java.util.Objects;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.zodiac.sdk.toolkit.util.lang.StrUtil;

final class AllowHeader extends AbstractHeader {

    protected Logger log = LoggerFactory.getLogger(getClass());

    AllowHeader(boolean isAllowOrigin) {
        super(Method[].class, isAllowOrigin ? HttpHeaderNames.ACCESS_CONTROL_ALLOW_METHODS : HttpHeaderNames.ALLOW);
    }

    @Override
    public CharSequence toCharSequence(Method[] value) {
        Objects.requireNonNull(value, "value");
        if (value.length == 1) {
            return value[0].toCharSequence();
        }
        AppendableCharSequence append = new AppendableCharSequence(15);
        for (int i = 0; i < value.length; i++) {
            append.append(value[i].toCharSequence());
            if (i != value.length -1) {
                append.append(',');
            }
        }
        return append;
    }

    @Override
    public Method[] toValue(CharSequence value) {
        Objects.requireNonNull(value, "value");
        CharSequence[] s = StrUtil.splitToArray(value, ',');
        Method[] result = new Method[s.length];
        for (int i = 0; i < s.length; i++) {
            try {
                result[i] = Method.valueOf(s[i]);
            } catch (Exception e) {
                log.warn(String.format("Bad methods in allow header '%s'", value), e);
                return null;
            }
        }
        return result;
    }

}