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672 lines
16 KiB
C#
672 lines
16 KiB
C#
//
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// System.Web.HttpUtility
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//
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// Authors:
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// Patrik Torstensson (Patrik.Torstensson@labs2.com)
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// Wictor Wilén (decode/encode functions) (wictor@ibizkit.se)
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// Tim Coleman (tim@timcoleman.com)
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// Gonzalo Paniagua Javier (gonzalo@ximian.com)
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//
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// Copyright (C) 2005-2010 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System.Collections;
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using System.Collections.Generic;
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using System.Collections.Specialized;
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using System.Globalization;
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using System.IO;
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using System.Security.Permissions;
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using System.Text;
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using System.Web.Util;
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namespace System.Web {
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#if !MOBILE
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// CAS - no InheritanceDemand here as the class is sealed
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[AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
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#endif
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public sealed class HttpUtility
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{
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sealed class HttpQSCollection : NameValueCollection
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{
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public override string ToString ()
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{
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int count = Count;
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if (count == 0)
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return "";
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StringBuilder sb = new StringBuilder ();
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string [] keys = AllKeys;
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for (int i = 0; i < count; i++) {
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sb.AppendFormat ("{0}={1}&", keys [i], UrlEncode (this [keys [i]]));
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}
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if (sb.Length > 0)
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sb.Length--;
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return sb.ToString ();
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}
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}
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#region Constructors
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public HttpUtility ()
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{
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}
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#endregion // Constructors
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#region Methods
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public static void HtmlAttributeEncode (string s, TextWriter output)
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{
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if (output == null) {
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throw new ArgumentNullException ("output");
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}
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HttpEncoder.Current.HtmlAttributeEncode (s, output);
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}
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public static string HtmlAttributeEncode (string s)
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{
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if (s == null)
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return null;
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using (var sw = new StringWriter ()) {
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HttpEncoder.Current.HtmlAttributeEncode (s, sw);
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return sw.ToString ();
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}
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}
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public static string UrlDecode (string str)
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{
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return UrlDecode(str, Encoding.UTF8);
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}
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static char [] GetChars (MemoryStream b, Encoding e)
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{
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return e.GetChars (b.GetBuffer (), 0, (int) b.Length);
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}
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static void WriteCharBytes (IList buf, char ch, Encoding e)
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{
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if (ch > 255) {
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foreach (byte b in e.GetBytes (new char[] { ch }))
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buf.Add (b);
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} else
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buf.Add ((byte)ch);
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}
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public static string UrlDecode (string str, Encoding e)
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{
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if (null == str)
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return null;
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if (str.IndexOf ('%') == -1 && str.IndexOf ('+') == -1)
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return str;
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if (e == null)
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e = Encoding.UTF8;
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long len = str.Length;
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var bytes = new List <byte> ();
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int xchar;
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char ch;
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for (int i = 0; i < len; i++) {
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ch = str [i];
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if (ch == '%' && i + 2 < len && str [i + 1] != '%') {
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if (str [i + 1] == 'u' && i + 5 < len) {
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// unicode hex sequence
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xchar = GetChar (str, i + 2, 4);
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if (xchar != -1) {
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WriteCharBytes (bytes, (char)xchar, e);
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i += 5;
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} else
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WriteCharBytes (bytes, '%', e);
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} else if ((xchar = GetChar (str, i + 1, 2)) != -1) {
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WriteCharBytes (bytes, (char)xchar, e);
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i += 2;
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} else {
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WriteCharBytes (bytes, '%', e);
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}
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continue;
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}
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if (ch == '+')
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WriteCharBytes (bytes, ' ', e);
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else
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WriteCharBytes (bytes, ch, e);
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}
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byte[] buf = bytes.ToArray ();
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bytes = null;
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return e.GetString (buf);
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}
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public static string UrlDecode (byte [] bytes, Encoding e)
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{
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if (bytes == null)
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return null;
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return UrlDecode (bytes, 0, bytes.Length, e);
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}
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static int GetInt (byte b)
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{
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char c = (char) b;
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if (c >= '0' && c <= '9')
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return c - '0';
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if (c >= 'a' && c <= 'f')
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return c - 'a' + 10;
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if (c >= 'A' && c <= 'F')
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return c - 'A' + 10;
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return -1;
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}
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static int GetChar (byte [] bytes, int offset, int length)
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{
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int value = 0;
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int end = length + offset;
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for (int i = offset; i < end; i++) {
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int current = GetInt (bytes [i]);
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if (current == -1)
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return -1;
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value = (value << 4) + current;
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}
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return value;
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}
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static int GetChar (string str, int offset, int length)
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{
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int val = 0;
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int end = length + offset;
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for (int i = offset; i < end; i++) {
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char c = str [i];
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if (c > 127)
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return -1;
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int current = GetInt ((byte) c);
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if (current == -1)
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return -1;
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val = (val << 4) + current;
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}
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return val;
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}
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public static string UrlDecode (byte [] bytes, int offset, int count, Encoding e)
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{
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if (bytes == null)
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return null;
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if (count == 0)
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return String.Empty;
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if (bytes == null)
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throw new ArgumentNullException ("bytes");
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if (offset < 0 || offset > bytes.Length)
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throw new ArgumentOutOfRangeException ("offset");
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if (count < 0 || offset + count > bytes.Length)
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throw new ArgumentOutOfRangeException ("count");
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StringBuilder output = new StringBuilder ();
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MemoryStream acc = new MemoryStream ();
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int end = count + offset;
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int xchar;
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for (int i = offset; i < end; i++) {
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if (bytes [i] == '%' && i + 2 < count && bytes [i + 1] != '%') {
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if (bytes [i + 1] == (byte) 'u' && i + 5 < end) {
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if (acc.Length > 0) {
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output.Append (GetChars (acc, e));
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acc.SetLength (0);
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}
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xchar = GetChar (bytes, i + 2, 4);
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if (xchar != -1) {
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output.Append ((char) xchar);
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i += 5;
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continue;
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}
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} else if ((xchar = GetChar (bytes, i + 1, 2)) != -1) {
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acc.WriteByte ((byte) xchar);
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i += 2;
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continue;
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}
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}
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if (acc.Length > 0) {
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output.Append (GetChars (acc, e));
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acc.SetLength (0);
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}
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if (bytes [i] == '+') {
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output.Append (' ');
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} else {
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output.Append ((char) bytes [i]);
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}
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}
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if (acc.Length > 0) {
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output.Append (GetChars (acc, e));
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}
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acc = null;
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return output.ToString ();
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}
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public static byte [] UrlDecodeToBytes (byte [] bytes)
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{
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if (bytes == null)
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return null;
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return UrlDecodeToBytes (bytes, 0, bytes.Length);
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}
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public static byte [] UrlDecodeToBytes (string str)
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{
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return UrlDecodeToBytes (str, Encoding.UTF8);
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}
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public static byte [] UrlDecodeToBytes (string str, Encoding e)
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{
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if (str == null)
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return null;
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if (e == null)
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throw new ArgumentNullException ("e");
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return UrlDecodeToBytes (e.GetBytes (str));
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}
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public static byte [] UrlDecodeToBytes (byte [] bytes, int offset, int count)
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{
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if (bytes == null)
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return null;
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if (count == 0)
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return new byte [0];
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int len = bytes.Length;
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if (offset < 0 || offset >= len)
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throw new ArgumentOutOfRangeException("offset");
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if (count < 0 || offset > len - count)
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throw new ArgumentOutOfRangeException("count");
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MemoryStream result = new MemoryStream ();
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int end = offset + count;
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for (int i = offset; i < end; i++){
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char c = (char) bytes [i];
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if (c == '+') {
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c = ' ';
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} else if (c == '%' && i < end - 2) {
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int xchar = GetChar (bytes, i + 1, 2);
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if (xchar != -1) {
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c = (char) xchar;
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i += 2;
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}
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}
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result.WriteByte ((byte) c);
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}
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return result.ToArray ();
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}
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public static string UrlEncode(string str)
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{
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return UrlEncode(str, Encoding.UTF8);
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}
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public static string UrlEncode (string str, Encoding e)
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{
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if (str == null)
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return null;
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if (str == String.Empty)
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return String.Empty;
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bool needEncode = false;
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int len = str.Length;
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for (int i = 0; i < len; i++) {
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char c = str [i];
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if ((c < '0') || (c < 'A' && c > '9') || (c > 'Z' && c < 'a') || (c > 'z')) {
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if (HttpEncoder.NotEncoded (c))
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continue;
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needEncode = true;
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break;
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}
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}
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if (!needEncode)
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return str;
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// avoided GetByteCount call
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byte [] bytes = new byte[e.GetMaxByteCount(str.Length)];
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int realLen = e.GetBytes (str, 0, str.Length, bytes, 0);
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return Encoding.ASCII.GetString (UrlEncodeToBytes (bytes, 0, realLen));
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}
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public static string UrlEncode (byte [] bytes)
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{
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if (bytes == null)
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return null;
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if (bytes.Length == 0)
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return String.Empty;
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return Encoding.ASCII.GetString (UrlEncodeToBytes (bytes, 0, bytes.Length));
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}
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public static string UrlEncode (byte [] bytes, int offset, int count)
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{
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if (bytes == null)
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return null;
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if (bytes.Length == 0)
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return String.Empty;
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return Encoding.ASCII.GetString (UrlEncodeToBytes (bytes, offset, count));
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}
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public static byte [] UrlEncodeToBytes (string str)
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{
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return UrlEncodeToBytes (str, Encoding.UTF8);
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}
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public static byte [] UrlEncodeToBytes (string str, Encoding e)
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{
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if (str == null)
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return null;
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if (str.Length == 0)
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return new byte [0];
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byte [] bytes = e.GetBytes (str);
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return UrlEncodeToBytes (bytes, 0, bytes.Length);
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}
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public static byte [] UrlEncodeToBytes (byte [] bytes)
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{
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if (bytes == null)
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return null;
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if (bytes.Length == 0)
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return new byte [0];
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return UrlEncodeToBytes (bytes, 0, bytes.Length);
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}
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public static byte [] UrlEncodeToBytes (byte [] bytes, int offset, int count)
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{
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if (bytes == null)
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return null;
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return HttpEncoder.Current.UrlEncode (bytes, offset, count);
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}
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public static string UrlEncodeUnicode (string str)
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{
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if (str == null)
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return null;
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return Encoding.ASCII.GetString (UrlEncodeUnicodeToBytes (str));
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}
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public static byte [] UrlEncodeUnicodeToBytes (string str)
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{
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if (str == null)
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return null;
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if (str.Length == 0)
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return new byte [0];
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MemoryStream result = new MemoryStream (str.Length);
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foreach (char c in str){
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HttpEncoder.UrlEncodeChar (c, result, true);
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}
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return result.ToArray ();
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}
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/// <summary>
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/// Decodes an HTML-encoded string and returns the decoded string.
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/// </summary>
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/// <param name="s">The HTML string to decode. </param>
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/// <returns>The decoded text.</returns>
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public static string HtmlDecode (string s)
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{
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if (s == null)
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return null;
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using (var sw = new StringWriter ()) {
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HttpEncoder.Current.HtmlDecode (s, sw);
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return sw.ToString ();
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}
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}
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/// <summary>
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/// Decodes an HTML-encoded string and sends the resulting output to a TextWriter output stream.
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/// </summary>
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/// <param name="s">The HTML string to decode</param>
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/// <param name="output">The TextWriter output stream containing the decoded string. </param>
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public static void HtmlDecode(string s, TextWriter output)
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{
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if (output == null) {
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throw new ArgumentNullException ("output");
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}
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if (!String.IsNullOrEmpty (s)) {
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HttpEncoder.Current.HtmlDecode (s, output);
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}
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}
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public static string HtmlEncode (string s)
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{
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if (s == null)
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return null;
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using (var sw = new StringWriter ()) {
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HttpEncoder.Current.HtmlEncode (s, sw);
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return sw.ToString ();
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}
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}
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/// <summary>
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/// HTML-encodes a string and sends the resulting output to a TextWriter output stream.
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/// </summary>
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/// <param name="s">The string to encode. </param>
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/// <param name="output">The TextWriter output stream containing the encoded string. </param>
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public static void HtmlEncode(string s, TextWriter output)
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{
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if (output == null) {
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throw new ArgumentNullException ("output");
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}
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if (!String.IsNullOrEmpty (s)) {
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HttpEncoder.Current.HtmlEncode (s, output);
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}
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}
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public static string HtmlEncode (object value)
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{
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if (value == null)
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return null;
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#if !(MOBILE || NO_SYSTEM_WEB_DEPENDENCY)
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IHtmlString htmlString = value as IHtmlString;
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if (htmlString != null)
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return htmlString.ToHtmlString ();
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#endif
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return HtmlEncode (value.ToString ());
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}
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public static string JavaScriptStringEncode (string value)
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{
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return JavaScriptStringEncode (value, false);
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}
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public static string JavaScriptStringEncode (string value, bool addDoubleQuotes)
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{
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if (String.IsNullOrEmpty (value))
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return addDoubleQuotes ? "\"\"" : String.Empty;
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int len = value.Length;
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bool needEncode = false;
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char c;
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for (int i = 0; i < len; i++) {
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c = value [i];
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if (c >= 0 && c <= 31 || c == 34 || c == 39 || c == 60 || c == 62 || c == 92) {
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needEncode = true;
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break;
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}
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}
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if (!needEncode)
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return addDoubleQuotes ? "\"" + value + "\"" : value;
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var sb = new StringBuilder ();
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if (addDoubleQuotes)
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sb.Append ('"');
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for (int i = 0; i < len; i++) {
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c = value [i];
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if (c >= 0 && c <= 7 || c == 11 || c >= 14 && c <= 31 || c == 39 || c == 60 || c == 62)
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sb.AppendFormat ("\\u{0:x4}", (int)c);
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else switch ((int)c) {
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case 8:
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sb.Append ("\\b");
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break;
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case 9:
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sb.Append ("\\t");
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break;
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case 10:
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sb.Append ("\\n");
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break;
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case 12:
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sb.Append ("\\f");
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break;
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case 13:
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sb.Append ("\\r");
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break;
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case 34:
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sb.Append ("\\\"");
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break;
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case 92:
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sb.Append ("\\\\");
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break;
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default:
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sb.Append (c);
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break;
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}
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}
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if (addDoubleQuotes)
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sb.Append ('"');
|
|
|
|
return sb.ToString ();
|
|
}
|
|
public static string UrlPathEncode (string str)
|
|
{
|
|
return HttpEncoder.Current.UrlPathEncode (str);
|
|
}
|
|
|
|
public static NameValueCollection ParseQueryString (string query)
|
|
{
|
|
return ParseQueryString (query, Encoding.UTF8);
|
|
}
|
|
|
|
public static NameValueCollection ParseQueryString (string query, Encoding encoding)
|
|
{
|
|
if (query == null)
|
|
throw new ArgumentNullException ("query");
|
|
if (encoding == null)
|
|
throw new ArgumentNullException ("encoding");
|
|
if (query.Length == 0 || (query.Length == 1 && query[0] == '?'))
|
|
return new HttpQSCollection ();
|
|
if (query[0] == '?')
|
|
query = query.Substring (1);
|
|
|
|
NameValueCollection result = new HttpQSCollection ();
|
|
ParseQueryString (query, encoding, result);
|
|
return result;
|
|
}
|
|
|
|
internal static void ParseQueryString (string query, Encoding encoding, NameValueCollection result)
|
|
{
|
|
if (query.Length == 0)
|
|
return;
|
|
|
|
string decoded = HtmlDecode (query);
|
|
int decodedLength = decoded.Length;
|
|
int namePos = 0;
|
|
bool first = true;
|
|
while (namePos <= decodedLength) {
|
|
int valuePos = -1, valueEnd = -1;
|
|
for (int q = namePos; q < decodedLength; q++) {
|
|
if (valuePos == -1 && decoded [q] == '=') {
|
|
valuePos = q + 1;
|
|
} else if (decoded [q] == '&') {
|
|
valueEnd = q;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (first) {
|
|
first = false;
|
|
if (decoded [namePos] == '?')
|
|
namePos++;
|
|
}
|
|
|
|
string name, value;
|
|
if (valuePos == -1) {
|
|
name = null;
|
|
valuePos = namePos;
|
|
} else {
|
|
name = UrlDecode (decoded.Substring (namePos, valuePos - namePos - 1), encoding);
|
|
}
|
|
if (valueEnd < 0) {
|
|
namePos = -1;
|
|
valueEnd = decoded.Length;
|
|
} else {
|
|
namePos = valueEnd + 1;
|
|
}
|
|
value = UrlDecode (decoded.Substring (valuePos, valueEnd - valuePos), encoding);
|
|
|
|
result.Add (name, value);
|
|
if (namePos == -1)
|
|
break;
|
|
}
|
|
}
|
|
#endregion // Methods
|
|
}
|
|
}
|
|
|