/
Utils.java
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/
Utils.java
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/*
* Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.net.httpserver;
/**
* Provides utility methods for checking header field names and quoted strings.
*/
public class Utils {
// ABNF primitives defined in RFC 7230
private static final boolean[] TCHAR = new boolean[256];
private static final boolean[] QDTEXT = new boolean[256];
private static final boolean[] QUOTED_PAIR = new boolean[256];
static {
char[] allowedTokenChars =
("!#$%&'*+-.^_`|~0123456789" +
"abcdefghijklmnopqrstuvwxyz" +
"ABCDEFGHIJKLMNOPQRSTUVWXYZ").toCharArray();
for (char c : allowedTokenChars) {
TCHAR[c] = true;
}
for (char c = 0x20; c <= 0xFF; c++) {
QDTEXT[c] = true;
}
QDTEXT[0x22] = false; // (") illegal
QDTEXT[0x5c] = false; // (\) illegal
QDTEXT[0x7F] = false; // (DEL) illegal
for (char c = 0x20; c <= 0xFF; c++) {
QUOTED_PAIR[c] = true;
}
QUOTED_PAIR[0x09] = true; // (\t) legal
QUOTED_PAIR[0x7F] = false; // (DEL) illegal
}
/*
* Validates an RFC 7230 field-name.
*/
public static boolean isValidName(String token) {
for (int i = 0; i < token.length(); i++) {
char c = token.charAt(i);
if (c > 255 || !TCHAR[c]) {
return false;
}
}
return !token.isEmpty();
}
/*
* Validates an RFC 7230 quoted-string.
*/
public static boolean isQuotedStringContent(String token) {
for (int i = 0; i < token.length(); i++) {
char c = token.charAt(i);
if (c > 255) {
return false;
} else if (c == 0x5c) { // check if valid quoted-pair
if (i == token.length() - 1 || !QUOTED_PAIR[token.charAt(i++)]) {
return false;
}
} else if (!QDTEXT[c]) {
return false; // illegal char
}
}
return true;
}
}