CookieUtil Class — netty Architecture

Source Code

codec-http/src/main/java/io/netty/handler/codec/http/cookie/CookieUtil.java lines 23–183

final class CookieUtil {

    private static final BitSet VALID_COOKIE_NAME_OCTETS = validCookieNameOctets();

    private static final BitSet VALID_COOKIE_VALUE_OCTETS = validCookieValueOctets();

    private static final BitSet VALID_COOKIE_ATTRIBUTE_VALUE_OCTETS = validCookieAttributeValueOctets();

    // token = 1*<any CHAR except CTLs or separators>
    // separators = "(" | ")" | "<" | ">" | "@"
    // | "," | ";" | ":" | "\" | <">
    // | "/" | "[" | "]" | "?" | "="
    // | "{" | "}" | SP | HT
    private static BitSet validCookieNameOctets() {
        BitSet bits = new BitSet();
        for (int i = 32; i < 127; i++) {
            bits.set(i);
        }
        int[] separators = new int[]
                { '(', ')', '<', '>', '@', ',', ';', ':', '\\', '"', '/', '[', ']', '?', '=', '{', '}', ' ', '\t' };
        for (int separator : separators) {
            bits.set(separator, false);
        }
        return bits;
    }

    // cookie-octet = %x21 / %x23-2B / %x2D-3A / %x3C-5B / %x5D-7E
    // US-ASCII characters excluding CTLs, whitespace, DQUOTE, comma, semicolon, and backslash
    private static BitSet validCookieValueOctets() {
        BitSet bits = new BitSet();
        bits.set(0x21);
        for (int i = 0x23; i <= 0x2B; i++) {
            bits.set(i);
        }
        for (int i = 0x2D; i <= 0x3A; i++) {
            bits.set(i);
        }
        for (int i = 0x3C; i <= 0x5B; i++) {
            bits.set(i);
        }
        for (int i = 0x5D; i <= 0x7E; i++) {
            bits.set(i);
        }
        return bits;
    }

    // path-value        = <any CHAR except CTLs or ";">
    private static BitSet validCookieAttributeValueOctets() {
        BitSet bits = new BitSet();
        for (int i = 32; i < 127; i++) {
            bits.set(i);
        }
        bits.set(';', false);
        return bits;
    }

    static StringBuilder stringBuilder() {
        return InternalThreadLocalMap.get().stringBuilder();
    }

    /**
     * @param buf a buffer where some cookies were maybe encoded
     * @return the buffer String without the trailing separator, or null if no cookie was appended.
     */
    static String stripTrailingSeparatorOrNull(StringBuilder buf) {
        return buf.length() == 0 ? null : stripTrailingSeparator(buf);
    }

    static String stripTrailingSeparator(StringBuilder buf) {
        if (buf.length() > 0) {
            buf.setLength(buf.length() - 2);
        }
        return buf.toString();
    }

    static void add(StringBuilder sb, String name, long val) {
        sb.append(name);
        sb.append('=');
        sb.append(val);
        sb.append(';');
        sb.append(HttpConstants.SP_CHAR);