129 lines
5.2 KiB
C#
129 lines
5.2 KiB
C#
/*
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*
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* (c) Copyright Ascensio System Limited 2010-2018
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*
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* This program is freeware. You can redistribute it and/or modify it under the terms of the GNU
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* General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html).
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* In accordance with Section 7(a) of the GNU GPL its Section 15 shall be amended to the effect that
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* Ascensio System SIA expressly excludes the warranty of non-infringement of any third-party rights.
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*
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* THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR
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* FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
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*
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* You can contact Ascensio System SIA by email at sales@onlyoffice.com
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*
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* The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display
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* Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
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*
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* Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains
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* relevant author attributions when distributing the software. If the display of the logo in its graphic
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* form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE"
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* in every copy of the program you distribute.
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* Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
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*
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*/
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namespace ASC.Web.Core.Files
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{
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public static class ContentDispositionUtil
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{
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public static string GetHeaderValue(string fileName, bool inline = false, bool withoutBase = false)
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{
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// If fileName contains any Unicode characters, encode according
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// to RFC 2231 (with clarifications from RFC 5987)
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if (fileName.Any(c => c > 127))
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{
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//.netcore
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var str = withoutBase
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? "{0}; filename*=UTF-8''{2}"
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: "{0}; filename=\"{2}\"; filename*=UTF-8''{2}";
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return string.Format(str,
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inline ? "inline" : "attachment",
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fileName,
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CreateRfc2231HeaderValue(fileName));
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}
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// Knowing there are no Unicode characters in this fileName, rely on
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// ContentDisposition.ToString() to encode properly.
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// In .Net 4.0, ContentDisposition.ToString() throws FormatException if
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// the file name contains Unicode characters.
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// In .Net 4.5, ContentDisposition.ToString() no longer throws FormatException
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// if it contains Unicode, and it will not encode Unicode as we require here.
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// The Unicode test above is identical to the 4.0 FormatException test,
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// allowing this helper to give the same results in 4.0 and 4.5.
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var disposition = new ContentDisposition { FileName = fileName, Inline = inline };
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return disposition.ToString();
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}
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private static string CreateRfc2231HeaderValue(string filename)
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{
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var builder = new StringBuilder();
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var filenameBytes = Encoding.UTF8.GetBytes(filename);
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foreach (var b in filenameBytes)
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{
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if (IsByteValidHeaderValueCharacter(b))
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{
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builder.Append((char)b);
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}
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else
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{
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AddByteToStringBuilder(b, builder);
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}
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}
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return builder.ToString();
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}
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// Application of RFC 2231 Encoding to Hypertext Transfer Protocol (HTTP) Header Fields, sec. 3.2
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// http://greenbytes.de/tech/webdav/draft-reschke-rfc2231-in-http-latest.html
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private static bool IsByteValidHeaderValueCharacter(byte b)
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{
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if ((byte)'0' <= b && b <= (byte)'9')
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{
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return true; // is digit
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}
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if ((byte)'a' <= b && b <= (byte)'z')
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{
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return true; // lowercase letter
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}
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if ((byte)'A' <= b && b <= (byte)'Z')
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{
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return true; // uppercase letter
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}
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switch (b)
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{
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case (byte)'-':
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case (byte)'.':
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case (byte)'_':
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case (byte)'~':
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case (byte)':':
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case (byte)'!':
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case (byte)'$':
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case (byte)'&':
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case (byte)'+':
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return true;
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}
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return false;
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}
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private static void AddByteToStringBuilder(byte b, StringBuilder builder)
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{
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builder.Append('%');
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int i = b;
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AddHexDigitToStringBuilder(i >> 4, builder);
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AddHexDigitToStringBuilder(i % 16, builder);
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}
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private const string HexDigits = "0123456789ABCDEF";
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private static void AddHexDigitToStringBuilder(int digit, StringBuilder builder)
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{
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builder.Append(HexDigits[digit]);
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}
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}
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} |