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clc/modules/authentication/src/main/java/com/eucalyptus/auth/policy/PatternUtils.java

 

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package com.eucalyptus.auth.policy;

 

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import java.util.regex.Pattern;

 

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public class PatternUtils {

 

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  private static final Pattern ESCAPE_PATTERN = Pattern.compile( "([^a-zA-z0-9*?])" );

 

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  private static final Pattern WILDCARD_MULTIPLE_PATTERN = Pattern.compile( "([*])" );

 

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  private static final Pattern WILDCARD_SINGLE_PATTERN = Pattern.compile( "([?])" );

 

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  /**

 

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   * Convert an IAM policy pattern (action pattern or resource pattern with * and ?)

 

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   * to a canonical Java regex Pattern.

 

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   * 

 

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   * @param policyPattern

 

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   * @return

 

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   */

 

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  public static String toJavaPattern( String pattern ) {

 

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    String result = pattern;

 

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    if ( pattern == null ) {

 

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      return null;

 

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    }

 

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    result = ESCAPE_PATTERN.matcher( result ).replaceAll( "\\\\$1" );

 

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    result = WILDCARD_SINGLE_PATTERN.matcher( result ).replaceAll( "." );

 

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    result = WILDCARD_MULTIPLE_PATTERN.matcher( result ).replaceAll( ".*" );

 

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    return result;

 

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  }

 

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}

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