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## org.apache.catalina.util
Class RequestUtil

    java.lang.Object
      |
      +--org.apache.catalina.util.RequestUtil

public final class RequestUtil
extends java.lang.Object

General purpose request parsing and encoding utility methods.

Version:
  $Revision: 1.20 $ $Date: 2003/02/15 01:54:25 $
Author:
  Craig R. McClanahan, Tim Tye

Constructor Summary
`RequestUtil()`

Method Summary
`static java.lang.String` | `encodeCookie(javax.servlet.http.Cookie cookie)` Encode a cookie as per RFC 2109.
`static java.lang.String` | `filter(java.lang.String message)` Filter the specified message string for characters that are sensitive in HTML.
`static java.lang.String` | `normalize(java.lang.String path)` Normalize a relative URI path that may have relative values ("/./", "/../", and so on ) it it.
`static java.lang.String` | `parseCharacterEncoding(java.lang.String contentType)` Parse the character encoding from the specified content type header.
`static javax.servlet.http.Cookie[]` | `parseCookieHeader(java.lang.String header)` Parse a cookie header into an array of cookies according to RFC 2109.
`static void` | `parseParameters(java.util.Map map, byte[] data, java.lang.String encoding)` Append request parameters from the specified String to the specified Map.
`static void` | `parseParameters(java.util.Map map, java.lang.String data, java.lang.String encoding)` Append request parameters from the specified String to the specified Map.
`static java.lang.String` | `URLDecode(byte[] bytes)` Decode and return the specified URL-encoded byte array.
`static java.lang.String` | `URLDecode(byte[] bytes, java.lang.String enc)` Decode and return the specified URL-encoded byte array.
`static java.lang.String` | `URLDecode(java.lang.String str)` Decode and return the specified URL-encoded String.
`static java.lang.String` | `URLDecode(java.lang.String str, java.lang.String enc)` Decode and return the specified URL-encoded String.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### RequestUtil

    public RequestUtil()

Method Detail

### encodeCookie

    public static java.lang.String encodeCookie(javax.servlet.http.Cookie cookie)

  Encode a cookie as per RFC 2109. The resulting string can be used as the value for a `Set-Cookie` header.

  Parameters:
    `cookie` - The cookie to encode.
  Returns:
    A string following RFC 2109.

### filter

    public static java.lang.String filter(java.lang.String message)

  Filter the specified message string for characters that are sensitive in HTML. This avoids potential attacks caused by including JavaScript codes in the request URL that is often reported in error messages.

  Parameters:
    `message` - The message string to be filtered

### normalize

    public static java.lang.String normalize(java.lang.String path)

  Normalize a relative URI path that may have relative values ("/./", "/../", and so on ) it it. WARNING - This method is useful only for normalizing application-generated paths. It does not try to perform security checks for malicious input.

  Parameters:
    `path` - Relative path to be normalized

### parseCharacterEncoding

    public static java.lang.String parseCharacterEncoding(java.lang.String contentType)

  Parse the character encoding from the specified content type header. If the content type is null, or there is no explicit character encoding, `null` is returned.

  Parameters:
    `contentType` - a content type header

### parseCookieHeader

    public static javax.servlet.http.Cookie[] parseCookieHeader(java.lang.String header)

  Parse a cookie header into an array of cookies according to RFC 2109.

  Parameters:
    `header` - Value of an HTTP "Cookie" header

### parseParameters

    public static void parseParameters(java.util.Map map,
                                       java.lang.String data,
                                       java.lang.String encoding)
                                throws java.io.UnsupportedEncodingException

  Append request parameters from the specified String to the specified Map. It is presumed that the specified Map is not accessed from any other thread, so no synchronization is performed.

  IMPLEMENTATION NOTE: URL decoding is performed individually on the parsed name and value elements, rather than on the entire query string ahead of time, to properly deal with the case where the name or value includes an encoded "=" or "&" character that would otherwise be interpreted as a delimiter.

  Parameters:
    `map` - Map that accumulates the resulting parameters
    `data` - Input string containing request parameters
  Throws:
    `java.lang.IllegalArgumentException` - if the data is malformed
    `java.io.UnsupportedEncodingException`

### URLDecode

    public static java.lang.String URLDecode(java.lang.String str)

  Decode and return the specified URL-encoded String. When the byte array is converted to a string, the system default character encoding is used... This may be different than some other servers.

  Parameters:
    `str` - The url-encoded string
  Throws:
    `java.lang.IllegalArgumentException` - if a '%' character is not followed by a valid 2-digit hexadecimal number

### URLDecode

    public static java.lang.String URLDecode(java.lang.String str,
                                             java.lang.String enc)

  Decode and return the specified URL-encoded String.

  Parameters:
    `str` - The url-encoded string
    `enc` - The encoding to use; if null, the default encoding is used
  Throws:
    `java.lang.IllegalArgumentException` - if a '%' character is not followed by a valid 2-digit hexadecimal number

### URLDecode

    public static java.lang.String URLDecode(byte[] bytes)

  Decode and return the specified URL-encoded byte array.

  Parameters:
    `bytes` - The url-encoded byte array
  Throws:
    `java.lang.IllegalArgumentException` - if a '%' character is not followed by a valid 2-digit hexadecimal number

### URLDecode

    public static java.lang.String URLDecode(byte[] bytes,
                                             java.lang.String enc)

  Decode and return the specified URL-encoded byte array.

  Parameters:
    `bytes` - The url-encoded byte array
    `enc` - The encoding to use; if null, the default encoding is used
  Throws:
    `java.lang.IllegalArgumentException` - if a '%' character is not followed by a valid 2-digit hexadecimal number

### parseParameters

    public static void parseParameters(java.util.Map map,
                                       byte[] data,
                                       java.lang.String encoding)
                                throws java.io.UnsupportedEncodingException

  Append request parameters from the specified String to the specified Map. It is presumed that the specified Map is not accessed from any other thread, so no synchronization is performed.

  IMPLEMENTATION NOTE: URL decoding is performed individually on the parsed name and value elements, rather than on the entire query string ahead of time, to properly deal with the case where the name or value includes an encoded "=" or "&" character that would otherwise be interpreted as a delimiter. NOTE: byte array data is modified by this method. Caller beware.

  Parameters:
    `map` - Map that accumulates the resulting parameters
    `data` - Input string containing request parameters
    `encoding` - Encoding to use for converting hex
  Throws:
    `java.io.UnsupportedEncodingException` - if the data is malformed

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