/// <summary> Copyright (C) 2004, 2005 Free Software Foundation, Inc.
/// *
/// Author: Alexander Gnauck AG-Software
/// *
/// This file is part of GNU Libidn.
/// *
/// This program is free software; you can redistribute it and/or
/// modify it under the terms of the GNU General Public License as
/// published by the Free Software Foundation; either version 2 of the
/// License, or (at your option) any later version.
/// *
/// This program is distributed in the hope that it will be useful,
/// but WITHOUT ANY WARRANTY; without even the implied warranty of
/// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
/// General Public License for more details.
/// *
/// You should have received a copy of the GNU General Public License
/// along with this program; if not, write to the Free Software
/// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
/// 02111-1307 USA.
/// </summary>
using System;
namespace gnu.inet.encoding
{
/// <summary> This class offers static methods for preparing internationalized
/// strings. It supports the following stringprep profiles:
/// <ul>
/// <li>RFC3491 nameprep
/// <li>RFC3920 XMPP nodeprep and resourceprep
/// </ul>
/// Note that this implementation only supports 16-bit Unicode code
/// points.
/// </summary>
public class Stringprep
{
/// <summary> Preps a name according to the Stringprep profile defined in
/// RFC3491. Unassigned code points are not allowed.
/// *
/// </summary>
/// <param name="input">the name to prep.
/// </param>
/// <returns> the prepped name.
/// @throws StringprepException If the name cannot be prepped with
/// this profile.
/// @throws NullPointerException If the name is null.
///
/// </returns>
public static System.String nameprep(System.String input)
{
return nameprep(input, false);
}
/// <summary> Preps a name according to the Stringprep profile defined in
/// RFC3491.
/// *
/// </summary>
/// <param name="input">the name to prep.
/// </param>
/// <param name="allowUnassigned">true if the name may contain unassigned
/// code points.
/// </param>
/// <returns> the prepped name.
/// @throws StringprepException If the name cannot be prepped with
/// this profile.
/// @throws NullPointerException If the name is null.
///
/// </returns>
public static System.String nameprep(System.String input, bool allowUnassigned)
{
if (input == null)
{
throw new System.NullReferenceException();
}
System.Text.StringBuilder s = new System.Text.StringBuilder(input);
if (!allowUnassigned && contains(s, RFC3454.A1))
{
throw new StringprepException(StringprepException.CONTAINS_UNASSIGNED);
}
filter(s, RFC3454.B1);
map(s, RFC3454.B2search, RFC3454.B2replace);
s = new System.Text.StringBuilder(NFKC.normalizeNFKC(s.ToString()));
// B.3 is only needed if NFKC is not used, right?
// map(s, RFC3454.B3search, RFC3454.B3replace);
if (contains(s, RFC3454.C12) || contains(s, RFC3454.C22) || contains(s, RFC3454.C3) || contains(s, RFC3454.C4) || contains(s, RFC3454.C5) || contains(s, RFC3454.C6) || contains(s, RFC3454.C7) || contains(s, RFC3454.C8))
{
// Table C.9 only contains code points > 0xFFFF which Java
// doesn't handle
throw new StringprepException(StringprepException.CONTAINS_PROHIBITED);
}
// Bidi handling
bool r = contains(s, RFC3454.D1);
bool l = contains(s, RFC3454.D2);
// RFC 3454, section 6, requirement 1: already handled above (table C.8)
// RFC 3454, section 6, requirement 2
if (r && l)
{
throw new StringprepException(StringprepException.BIDI_BOTHRAL);
}
// RFC 3454, section 6, requirement 3
if (r)
{
if (!contains(s[0], RFC3454.D1) || !contains(s[s.Length - 1], RFC3454.D1))
{
throw new StringprepException(StringprepException.BIDI_LTRAL);
}
}
return s.ToString();
}
/**
* Characters prohibited by RFC3920 nodeprep that aren't defined as
* part of the RFC3454 tables.
*/
private static char [] RFC3920_NODEPREP_PROHIBIT = new char [] {
'\u0022', '\u0026', '\'', '\u002F',
'\u003A', '\u003C', '\u003E', '\u0040'
};
/// <summary> Preps a node name according to the Stringprep profile defined in
/// RFC3920. Unassigned code points are not allowed.
/// *
/// </summary>
/// <param name="input">the node name to prep.
/// </param>
/// <returns> the prepped node name.
/// @throws StringprepException If the node name cannot be prepped
/// with this profile.
/// @throws NullPointerException If the node name is null.
///
/// </returns>
public static System.String nodeprep(System.String input)
{
return nodeprep(input, false);
}
/// <summary> Preps a node name according to the Stringprep profile defined in
/// RFC3920.
/// *
/// </summary>
/// <param name="input">the node name to prep.
/// </param>
/// <param name="allowUnassigned">true if the node name may contain
/// unassigned code points.
/// </param>
/// <returns> the prepped node name.
/// @throws StringprepException If the node name cannot be prepped
/// with this profile.
/// @throws NullPointerException If the node name is null.
///
/// </returns>
public static System.String nodeprep(System.String input, bool allowUnassigned)
{
if (input == null)
{
throw new System.NullReferenceException();
}
System.Text.StringBuilder s = new System.Text.StringBuilder(input);
if (!allowUnassigned && contains(s, RFC3454.A1))
{
throw new StringprepException(StringprepException.CONTAINS_UNASSIGNED);
}
filter(s, RFC3454.B1);
map(s, RFC3454.B2search, RFC3454.B2replace);
s = new System.Text.StringBuilder(NFKC.normalizeNFKC(s.ToString()));
if (contains(s, RFC3454.C11) || contains(s, RFC3454.C12) || contains(s, RFC3454.C21) || contains(s, RFC3454.C22) || contains(s, RFC3454.C3) || contains(s, RFC3454.C4) || contains(s, RFC3454.C5) || contains(s, RFC3454.C6) || contains(s, RFC3454.C7) || contains(s, RFC3454.C8) || contains(s, RFC3920_NODEPREP_PROHIBIT))
{
// Table C.9 only contains code points > 0xFFFF which Java
// doesn't handle
throw new StringprepException(StringprepException.CONTAINS_PROHIBITED);
}
// Bidi handling
bool r = contains(s, RFC3454.D1);
bool l = contains(s, RFC3454.D2);
// RFC 3454, section 6, requirement 1: already handled above (table C.8)
// RFC 3454, section 6, requirement 2
if (r && l)
{
throw new StringprepException(StringprepException.BIDI_BOTHRAL);
}
// RFC 3454, section 6, requirement 3
if (r)
{
if (!contains(s[0], RFC3454.D1) || !contains(s[s.Length - 1], RFC3454.D1))
{
throw new StringprepException(StringprepException.BIDI_LTRAL);
}
}
return s.ToString();
}
/// <summary> Preps a resource name according to the Stringprep profile defined
/// in RFC3920. Unassigned code points are not allowed.
/// *
/// </summary>
/// <param name="input">the resource name to prep.
/// </param>
/// <returns> the prepped node name.
/// @throws StringprepException If the resource name cannot be prepped
/// with this profile.
/// @throws NullPointerException If the resource name is null.
///
/// </returns>
public static System.String resourceprep(System.String input)
{
return resourceprep(input, false);
}
/// <summary> Preps a resource name according to the Stringprep profile defined
/// in RFC3920.
/// *
/// </summary>
/// <param name="input">the resource name to prep.
/// </param>
/// <param name="allowUnassigned">true if the resource name may contain
/// unassigned code points.
/// </param>
/// <returns> the prepped node name.
/// @throws StringprepException If the resource name cannot be prepped
/// with this profile.
/// @throws NullPointerException If the resource name is null.
///
/// </returns>
public static System.String resourceprep(System.String input, bool allowUnassigned)
{
if (input == null)
{
throw new System.NullReferenceException();
}
System.Text.StringBuilder s = new System.Text.StringBuilder(input);
if (!allowUnassigned && contains(s, RFC3454.A1))
{
throw new StringprepException(StringprepException.CONTAINS_UNASSIGNED);
}
filter(s, RFC3454.B1);
s = new System.Text.StringBuilder(NFKC.normalizeNFKC(s.ToString()));
if (contains(s, RFC3454.C12) || contains(s, RFC3454.C21) || contains(s, RFC3454.C22) || contains(s, RFC3454.C3) || contains(s, RFC3454.C4) || contains(s, RFC3454.C5) || contains(s, RFC3454.C6) || contains(s, RFC3454.C7) || contains(s, RFC3454.C8))
{
// Table C.9 only contains code points > 0xFFFF which Java
// doesn't handle
throw new StringprepException(StringprepException.CONTAINS_PROHIBITED);
}
// Bidi handling
bool r = contains(s, RFC3454.D1);
bool l = contains(s, RFC3454.D2);
// RFC 3454, section 6, requirement 1: already handled above (table C.8)
// RFC 3454, section 6, requirement 2
if (r && l)
{
throw new StringprepException(StringprepException.BIDI_BOTHRAL);
}
// RFC 3454, section 6, requirement 3
if (r)
{
if (!contains(s[0], RFC3454.D1) || !contains(s[s.Length - 1], RFC3454.D1))
{
throw new StringprepException(StringprepException.BIDI_LTRAL);
}
}
return s.ToString();
}
internal static bool contains(System.Text.StringBuilder s, char[] p)
{
for (int i = 0; i < p.Length; i++)
{
char c = p[i];
for (int j = 0; j < s.Length; j++)
{
if (c == s[j])
{
return true;
}
}
}
return false;
}
internal static bool contains(System.Text.StringBuilder s, char[][] p)
{
for (int i = 0; i < p.Length; i++)
{
char[] r = p[i];
if (1 == r.Length)
{
char c = r[0];
for (int j = 0; j < s.Length; j++)
{
if (c == s[j])
{
return true;
}
}
}
else if (2 == r.Length)
{
char f = r[0];
char t = r[1];
for (int j = 0; j < s.Length; j++)
{
if (f <= s[j] && t >= s[j])
{
return true;
}
}
}
}
return false;
}
internal static bool contains(char c, char[][] p)
{
for (int i = 0; i < p.Length; i++)
{
char[] r = p[i];
if (1 == r.Length)
{
if (c == r[0])
{
return true;
}
}
else if (2 == r.Length)
{
char f = r[0];
char t = r[1];
if (f <= c && t >= c)
{
return true;
}
}
}
return false;
}
internal static void filter(System.Text.StringBuilder s, char[] f)
{
for (int i = 0; i < f.Length; i++)
{
char c = f[i];
int j = 0;
while (j < s.Length)
{
if (c == s[j])
{
//s.deleteCharAt(j);
s.Remove(j, 1);
}
else
{
j++;
}
}
}
}
internal static void filter(System.Text.StringBuilder s, char[][] f)
{
for (int i = 0; i < f.Length; i++)
{
char[] r = f[i];
if (1 == r.Length)
{
char c = r[0];
int j = 0;
while (j < s.Length)
{
if (c == s[j])
{
//s.deleteCharAt(j);
s.Remove(j, 1);
}
else
{
j++;
}
}
}
else if (2 == r.Length)
{
char from = r[0];
char to = r[1];
int j = 0;
while (j < s.Length)
{
if (from <= s[j] && to >= s[j])
{
//s.deleteCharAt(j);
s.Remove(j, 1);
}
else
{
j++;
}
}
}
}
}
internal static void map(System.Text.StringBuilder s, char[] search, System.String[] replace)
{
for (int i = 0; i < search.Length; i++)
{
char c = search[i];
int j = 0;
while (j < s.Length)
{
if (c == s[j])
{
//s.deleteCharAt(j);
s.Remove(j, 1);
if (null != replace[i])
{
s.Insert(j, replace[i]);
j += replace[i].Length - 1;
}
}
else
{
j++;
}
}
}
}
}
}