| /* |
| * 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.directory.api.ldap.model.filter; |
| |
| |
| import java.text.Format; |
| import java.text.MessageFormat; |
| |
| |
| /** |
| * An encoder for LDAP filters. |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| */ |
| public final class FilterEncoder |
| { |
| private static final String[] EMPTY = new String[0]; |
| |
| |
| private FilterEncoder() |
| { |
| } |
| |
| |
| /** |
| * Formats a filter and handles encoding of special characters in the value arguments using the |
| * <valueencoding> rule as described in <a href="http://www.ietf.org/rfc/rfc4515.txt">RFC 4515</a>. |
| * <p> |
| * Example of filter template format: <code>(&(cn={0})(uid={1}))</code> |
| * |
| * @param filterTemplate the filter with placeholders |
| * @param values the values to encode and substitute |
| * @return the formatted filter with escaped values |
| * @throws IllegalArgumentException if the number of values does not match the number of placeholders in the template |
| */ |
| public static String format( String filterTemplate, String... values ) throws IllegalArgumentException |
| { |
| if ( values == null ) |
| { |
| values = EMPTY; |
| } |
| |
| MessageFormat mf = new MessageFormat( filterTemplate ); |
| |
| // check element count and argument count |
| Format[] formats = mf.getFormatsByArgumentIndex(); |
| if ( formats.length != values.length ) |
| { |
| // TODO: I18n |
| String msg = "Filter template {0} has {1} placeholders but {2} arguments provided."; |
| throw new IllegalArgumentException( MessageFormat.format( msg, filterTemplate, formats.length, |
| values.length ) ); |
| } |
| |
| // encode arguments |
| for ( int i = 0; i < values.length; i++ ) |
| { |
| values[i] = encodeFilterValue( values[i] ); |
| } |
| |
| // format the filter |
| String format = mf.format( values ); |
| return format; |
| } |
| |
| |
| /** |
| * Handles encoding of special characters in LDAP search filter assertion values using the |
| * <valueencoding> rule as described in <a href="http://www.ietf.org/rfc/rfc4515.txt">RFC 4515</a>. |
| * |
| * @param value Right hand side of "attrId=value" assertion occurring in an LDAP search filter. |
| * @return Escaped version of <code>value</code> |
| */ |
| public static String encodeFilterValue( String value ) |
| { |
| StringBuilder sb = new StringBuilder( value.length() ); |
| boolean escaped = false; |
| boolean hexPair = false; |
| char hex = '\0'; |
| |
| for ( int i = 0; i < value.length(); i++ ) |
| { |
| char ch = value.charAt( i ); |
| |
| switch ( ch ) |
| { |
| case '*': |
| if ( escaped ) |
| { |
| sb.append( "\\5C" ); |
| |
| if ( hexPair ) |
| { |
| sb.append( hex ); |
| hexPair = false; |
| } |
| |
| escaped = false; |
| } |
| |
| sb.append( "\\2A" ); |
| break; |
| |
| case '(': |
| if ( escaped ) |
| { |
| sb.append( "\\5C" ); |
| |
| if ( hexPair ) |
| { |
| sb.append( hex ); |
| hexPair = false; |
| } |
| |
| escaped = false; |
| } |
| |
| sb.append( "\\28" ); |
| break; |
| |
| case ')': |
| if ( escaped ) |
| { |
| sb.append( "\\5C" ); |
| |
| if ( hexPair ) |
| { |
| sb.append( hex ); |
| hexPair = false; |
| } |
| |
| escaped = false; |
| } |
| |
| sb.append( "\\29" ); |
| break; |
| |
| case '\0': |
| if ( escaped ) |
| { |
| sb.append( "\\5C" ); |
| |
| if ( hexPair ) |
| { |
| sb.append( hex ); |
| hexPair = false; |
| } |
| |
| escaped = false; |
| } |
| |
| sb.append( "\\00" ); |
| break; |
| |
| case '\\': |
| if ( escaped ) |
| { |
| sb.append( "\\5C" ); |
| escaped = false; |
| } |
| else |
| { |
| escaped = true; |
| hexPair = false; |
| } |
| |
| break; |
| |
| case '0': |
| case '1': |
| case '2': |
| case '3': |
| case '4': |
| case '5': |
| case '6': |
| case '7': |
| case '8': |
| case '9': |
| case 'a': |
| case 'b': |
| case 'c': |
| case 'd': |
| case 'e': |
| case 'f': |
| case 'A': |
| case 'B': |
| case 'C': |
| case 'D': |
| case 'E': |
| case 'F': |
| if ( escaped ) |
| { |
| if ( hexPair ) |
| { |
| sb.append( '\\' ).append( hex ).append( ch ); |
| escaped = false; |
| hexPair = false; |
| } |
| else |
| { |
| hexPair = true; |
| hex = ch; |
| } |
| } |
| else |
| { |
| sb.append( ch ); |
| } |
| |
| break; |
| |
| default: |
| if ( escaped ) |
| { |
| sb.append( "\\5C" ); |
| |
| if ( hexPair ) |
| { |
| sb.append( hex ); |
| hexPair = false; |
| } |
| |
| escaped = false; |
| } |
| |
| sb.append( ch ); |
| } |
| } |
| |
| if ( escaped ) |
| { |
| sb.append( "\\5C" ); |
| } |
| |
| return sb.toString(); |
| } |
| } |