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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
package org.apache.mina.proxy.utils;
import java.io.ByteArrayOutputStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.security.sasl.AuthenticationException;
import javax.security.sasl.SaslException;
/**
* StringUtilities.java - Various methods to handle strings.
*
* @author Apache MINA Project
* @since MINA 2.0.0-M3
*/
public class StringUtilities {
private StringUtilities(){
}
/**
* A directive is a parameter of the digest authentication process.
* Returns the value of a directive from the map. If mandatory is true and the
* value is null, then it throws an {@link AuthenticationException}.
*
* @param directivesMap the directive's map
* @param directive the name of the directive we want to retrieve
* @param mandatory is the directive mandatory
* @return the mandatory value as a String
* @throws AuthenticationException if mandatory is true and if
* directivesMap.get(directive) == null
*/
public static String getDirectiveValue(Map directivesMap, String directive, boolean mandatory)
throws AuthenticationException {
String value = directivesMap.get(directive);
if (value == null) {
if (mandatory) {
throw new AuthenticationException("\"" + directive + "\" mandatory directive is missing");
}
return "";
}
return value;
}
/**
* Copy the directive to the {@link StringBuilder} if not null.
* (A directive is a parameter of the digest authentication process.)
*
* @param directives the directives map
* @param sb the output buffer
* @param directive the directive name to look for
*/
public static void copyDirective(Map directives, StringBuilder sb, String directive) {
String directiveValue = directives.get(directive);
if (directiveValue != null) {
sb.append(directive).append(" = \"").append(directiveValue).append("\", ");
}
}
/**
* Copy the directive from the source map to the destination map, if it's
* value isn't null.
* (A directive is a parameter of the digest authentication process.)
*
* @param src the source map
* @param dst the destination map
* @param directive the directive name
* @return the value of the copied directive
*/
public static String copyDirective(Map src, Map dst, String directive) {
String directiveValue = src.get(directive);
if (directiveValue != null) {
dst.put(directive, directiveValue);
}
return directiveValue;
}
/**
* Parses digest-challenge string, extracting each token and value(s). Each token
* is a directive.
*
* @param buf A non-null digest-challenge string.
* @return A Map containing the aprsed directives
* @throws SaslException if the String cannot be parsed according to RFC 2831
*/
public static Map parseDirectives(byte[] buf) throws SaslException {
Map map = new HashMap<>();
boolean gettingKey = true;
boolean gettingQuotedValue = false;
boolean expectSeparator = false;
byte bch;
ByteArrayOutputStream key = new ByteArrayOutputStream(10);
ByteArrayOutputStream value = new ByteArrayOutputStream(10);
int i = skipLws(buf, 0);
while (i < buf.length) {
bch = buf[i];
if (gettingKey) {
if (bch == ',') {
if (key.size() != 0) {
throw new SaslException("Directive key contains a ',':" + key);
}
// Empty element, skip separator and lws
i = skipLws(buf, i + 1);
} else if (bch == '=') {
if (key.size() == 0) {
throw new SaslException("Empty directive key");
}
gettingKey = false; // Termination of key
i = skipLws(buf, i + 1); // Skip to next non whitespace
// Check whether value is quoted
if (i < buf.length) {
if (buf[i] == '"') {
gettingQuotedValue = true;
++i; // Skip quote
}
} else {
throw new SaslException("Valueless directive found: " + key.toString());
}
} else if (isLws(bch)) {
// LWS that occurs after key
i = skipLws(buf, i + 1);
// Expecting '='
if (i < buf.length) {
if (buf[i] != '=') {
throw new SaslException("'=' expected after key: " + key.toString());
}
} else {
throw new SaslException("'=' expected after key: " + key.toString());
}
} else {
key.write(bch); // Append to key
++i; // Advance
}
} else if (gettingQuotedValue) {
// Getting a quoted value
if (bch == '\\') {
// quoted-pair = "\" CHAR ==> CHAR
++i; // Skip escape
if (i < buf.length) {
value.write(buf[i]);
++i; // Advance
} else {
// Trailing escape in a quoted value
throw new SaslException("Unmatched quote found for directive: " + key.toString()
+ " with value: " + value.toString());
}
} else if (bch == '"') {
// closing quote
++i; // Skip closing quote
gettingQuotedValue = false;
expectSeparator = true;
} else {
value.write(bch);
++i; // Advance
}
} else if (isLws(bch) || bch == ',') {
// Value terminated
extractDirective(map, key.toString(), value.toString());
key.reset();
value.reset();
gettingKey = true;
gettingQuotedValue = expectSeparator = false;
i = skipLws(buf, i + 1); // Skip separator and LWS
} else if (expectSeparator) {
throw new SaslException("Expecting comma or linear whitespace after quoted string: \""
+ value.toString() + "\"");
} else {
value.write(bch); // Unquoted value
++i; // Advance
}
}
if (gettingQuotedValue) {
throw new SaslException("Unmatched quote found for directive: " + key.toString() + " with value: "
+ value.toString());
}
// Get last pair
if (key.size() > 0) {
extractDirective(map, key.toString(), value.toString());
}
return map;
}
/**
* Processes directive/value pairs from the digest-challenge and
* fill out the provided map.
*
* @param key A non-null String challenge token name.
* @param value A non-null String token value.
* @throws SaslException if either the key or the value is null or
* if the key already has a value.
*/
private static void extractDirective(Map map, String key, String value) throws SaslException {
if (map.get(key) != null) {
throw new SaslException("Peer sent more than one " + key + " directive");
}
map.put(key, value);
}
/**
* Is character a linear white space ?
* LWS = [CRLF] 1*( SP | HT )
* Note that we're checking individual bytes instead of CRLF
*
* @param b the byte to check
* @return true if it's a linear white space
*/
public static boolean isLws(byte b) {
switch (b) {
case 13: // US-ASCII CR, carriage return
case 10: // US-ASCII LF, line feed
case 32: // US-ASCII SP, space
case 9: // US-ASCII HT, horizontal-tab
return true;
}
return false;
}
/**
* Skip all linear white spaces
*
* @param buf the buf which is being scanned for lws
* @param start the offset to start at
* @return the next position in buf which isn't a lws character
*/
private static int skipLws(byte[] buf, int start) {
int i;
for (i = start; i < buf.length; i++) {
if (!isLws(buf[i])) {
return i;
}
}
return i;
}
/**
* Used to convert username-value, passwd or realm to 8859_1 encoding
* if all chars in string are within the 8859_1 (Latin 1) encoding range.
*
* @param str a non-null String
* @return a non-null String containing the 8859_1 encoded string
* @throws UnsupportedEncodingException if we weren't able to decode using the ISO 8859_1 encoding
*/
public static String stringTo8859_1(String str) throws UnsupportedEncodingException {
if (str == null) {
return "";
}
return new String(str.getBytes("UTF8"), "8859_1");
}
/**
* Returns the value of the named header. If it has multiple values
* then an {@link IllegalArgumentException} is thrown
*
* @param headers the http headers map
* @param key the key of the header
* @return the value of the http header
*/
public static String getSingleValuedHeader(Map> headers, String key) {
List values = headers.get(key);
if (values == null) {
return null;
}
if (values.size() > 1) {
throw new IllegalArgumentException("Header with key [\"" + key + "\"] isn't single valued !");
}
return values.get(0);
}
/**
* Adds an header to the provided map of headers.
*
* @param headers the http headers map
* @param key the name of the new header to add
* @param value the value of the added header
* @param singleValued if true and the map already contains one value
* then it is replaced by the new value. Otherwise it simply adds a new
* value to this multi-valued header.
*/
public static void addValueToHeader(Map> headers, String key, String value,
boolean singleValued) {
List values = headers.get(key);
if (values == null) {
values = new ArrayList<>(1);
headers.put(key, values);
}
if (singleValued && values.size() == 1) {
values.set(0, value);
} else {
values.add(value);
}
}
}
