org.eclipse.jetty.http.Syntax Maven / Gradle / Ivy
//
// ========================================================================
// Copyright (c) 1995-2018 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.http;
import java.util.Objects;
/**
* Collection of Syntax validation methods.
*
* Use in a similar way as you would {@link java.util.Objects#requireNonNull(Object)}
*
*/
public final class Syntax
{
/**
* Per RFC2616: Section 2.2, a token follows these syntax rules
*
* token = 1*<any CHAR except CTLs or separators>
* CHAR = <any US-ASCII character (octets 0 - 127)>
* CTL = <any US-ASCII control character
* (octets 0 - 31) and DEL (127)>
* separators = "(" | ")" | "<" | ">" | "@"
* | "," | ";" | ":" | "\" | <">
* | "/" | "[" | "]" | "?" | "="
* | "{" | "}" | SP | HT
*
*
* @param value the value to test
* @param msg the message to be prefixed if an {@link IllegalArgumentException} is thrown.
* @throws IllegalArgumentException if the value is invalid per spec
*/
public static void requireValidRFC2616Token(String value, String msg)
{
Objects.requireNonNull(msg, "msg cannot be null");
if (value == null)
{
return;
}
int valueLen = value.length();
if (valueLen == 0)
{
return;
}
for (int i = 0; i < valueLen; i++)
{
char c = value.charAt(i);
// 0x00 - 0x1F are low order control characters
// 0x7F is the DEL control character
if ((c <= 0x1F) || (c == 0x7F))
throw new IllegalArgumentException(msg + ": RFC2616 tokens may not contain control characters");
if (c == '(' || c == ')' || c == '<' || c == '>' || c == '@'
|| c == ',' || c == ';' || c == ':' || c == '\\' || c == '"'
|| c == '/' || c == '[' || c == ']' || c == '?' || c == '='
|| c == '{' || c == '}' || c == ' ')
{
throw new IllegalArgumentException(msg + ": RFC2616 tokens may not contain separator character: [" + c + "]");
}
if (c >= 0x80)
throw new IllegalArgumentException(msg + ": RFC2616 tokens characters restricted to US-ASCII: 0x" + Integer.toHexString(c));
}
}
/**
* Per RFC6265, Cookie.value follows these syntax rules
*
* cookie-value = *cookie-octet / ( DQUOTE *cookie-octet DQUOTE )
* cookie-octet = %x21 / %x23-2B / %x2D-3A / %x3C-5B / %x5D-7E
* ; US-ASCII characters excluding CTLs,
* ; whitespace DQUOTE, comma, semicolon,
* ; and backslash
*
*
* @param value the value to test
* @throws IllegalArgumentException if the value is invalid per spec
*/
public static void requireValidRFC6265CookieValue(String value)
{
if (value == null)
{
return;
}
int valueLen = value.length();
if (valueLen == 0)
{
return;
}
int i = 0;
if (value.charAt(0) == '"')
{
// Has starting DQUOTE
if (valueLen <= 1 || (value.charAt(valueLen - 1) != '"'))
{
throw new IllegalArgumentException("RFC6265 Cookie values must have balanced DQUOTES (if used)");
}
// adjust search range to exclude DQUOTES
i++;
valueLen--;
}
for (; i < valueLen; i++)
{
char c = value.charAt(i);
// 0x00 - 0x1F are low order control characters
// 0x7F is the DEL control character
if ((c <= 0x1F) || (c == 0x7F))
throw new IllegalArgumentException("RFC6265 Cookie values may not contain control characters");
if ((c == ' ' /* 0x20 */) ||
(c == '"' /* 0x2C */) ||
(c == ';' /* 0x3B */) ||
(c == '\\' /* 0x5C */))
{
throw new IllegalArgumentException("RFC6265 Cookie values may not contain character: [" + c + "]");
}
if (c >= 0x80)
throw new IllegalArgumentException("RFC6265 Cookie values characters restricted to US-ASCII: 0x" + Integer.toHexString(c));
}
}
}