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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2001 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
* (C) 2006 Alexey Proskuryakov (ap@nypop.com)
* Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "FormDataBuilder.h"
#include "Document.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "TextEncoding.h"
#include <limits>
#include <wtf/Assertions.h>
#include <wtf/HexNumber.h>
#include <wtf/text/CString.h>
#include <wtf/RandomNumber.h>
namespace WebCore {
// Helper functions
static inline void append(Vector<char>& buffer, char string)
{
buffer.append(string);
}
static inline void append(Vector<char>& buffer, const char* string)
{
buffer.append(string, strlen(string));
}
static inline void append(Vector<char>& buffer, const CString& string)
{
buffer.append(string.data(), string.length());
}
static void appendQuotedString(Vector<char>& buffer, const CString& string)
{
// Append a string as a quoted value, escaping quotes and line breaks.
// FIXME: Is it correct to use percent escaping here? Other browsers do not encode these characters yet,
// so we should test popular servers to find out if there is an encoding form they can handle.
unsigned length = string.length();
for (unsigned i = 0; i < length; ++i) {
unsigned char c = string.data()[i];
switch (c) {
case 0x0a:
append(buffer, "%0A");
break;
case 0x0d:
append(buffer, "%0D");
break;
case '"':
append(buffer, "%22");
break;
default:
append(buffer, c);
}
}
}
TextEncoding FormDataBuilder::encodingFromAcceptCharset(const String& acceptCharset, Document* document)
{
String normalizedAcceptCharset = acceptCharset;
normalizedAcceptCharset.replace(',', ' ');
Vector<String> charsets;
normalizedAcceptCharset.split(' ', charsets);
TextEncoding encoding;
Vector<String>::const_iterator end = charsets.end();
for (Vector<String>::const_iterator it = charsets.begin(); it != end; ++it) {
if ((encoding = TextEncoding(*it)).isValid())
return encoding;
}
return document->inputEncoding();
}
Vector<char> FormDataBuilder::generateUniqueBoundaryString()
{
Vector<char> boundary;
// The RFC 2046 spec says the alphanumeric characters plus the
// following characters are legal for boundaries: '()+_,-./:=?
// However the following characters, though legal, cause some sites
// to fail: (),./:=+
// Note that our algorithm makes it twice as much likely for 'A' or 'B'
// to appear in the boundary string, because 0x41 and 0x42 are present in
// the below array twice.
static const char alphaNumericEncodingMap[64] = {
0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50,
0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
0x59, 0x5A, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66,
0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E,
0x6F, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76,
0x77, 0x78, 0x79, 0x7A, 0x30, 0x31, 0x32, 0x33,
0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x41, 0x42
};
// Start with an informative prefix.
append(boundary, "----WebKitFormBoundary");
// Append 16 random 7bit ascii AlphaNumeric characters.
Vector<char> randomBytes;
for (unsigned i = 0; i < 4; ++i) {
unsigned randomness = static_cast<unsigned>(randomNumber() * (std::numeric_limits<unsigned>::max() + 1.0));
randomBytes.append(alphaNumericEncodingMap[(randomness >> 24) & 0x3F]);
randomBytes.append(alphaNumericEncodingMap[(randomness >> 16) & 0x3F]);
randomBytes.append(alphaNumericEncodingMap[(randomness >> 8) & 0x3F]);
randomBytes.append(alphaNumericEncodingMap[randomness & 0x3F]);
}
boundary.append(randomBytes);
boundary.append(0); // Add a 0 at the end so we can use this as a C-style string.
return boundary;
}
void FormDataBuilder::beginMultiPartHeader(Vector<char>& buffer, const CString& boundary, const CString& name)
{
addBoundaryToMultiPartHeader(buffer, boundary);
// FIXME: This loses data irreversibly if the input name includes characters you can't encode
// in the website's character set.
append(buffer, "Content-Disposition: form-data; name=\"");
appendQuotedString(buffer, name);
append(buffer, '"');
}
void FormDataBuilder::addBoundaryToMultiPartHeader(Vector<char>& buffer, const CString& boundary, bool isLastBoundary)
{
append(buffer, "--");
append(buffer, boundary);
if (isLastBoundary)
append(buffer, "--");
append(buffer, "\r\n");
}
void FormDataBuilder::addFilenameToMultiPartHeader(Vector<char>& buffer, const TextEncoding& encoding, const String& filename)
{
// FIXME: This loses data irreversibly if the filename includes characters you can't encode
// in the website's character set.
append(buffer, "; filename=\"");
appendQuotedString(buffer, encoding.encode(filename.characters(), filename.length(), QuestionMarksForUnencodables));
append(buffer, '"');
}
void FormDataBuilder::addContentTypeToMultiPartHeader(Vector<char>& buffer, const CString& mimeType)
{
append(buffer, "\r\nContent-Type: ");
append(buffer, mimeType);
}
void FormDataBuilder::finishMultiPartHeader(Vector<char>& buffer)
{
append(buffer, "\r\n\r\n");
}
void FormDataBuilder::addKeyValuePairAsFormData(Vector<char>& buffer, const CString& key, const CString& value)
{
if (!buffer.isEmpty())
append(buffer, '&');
encodeStringAsFormData(buffer, key);
append(buffer, '=');
encodeStringAsFormData(buffer, value);
}
void FormDataBuilder::encodeStringAsFormData(Vector<char>& buffer, const CString& string)
{
// Same safe characters as Netscape for compatibility.
static const char safeCharacters[] = "-._*";
// http://www.w3.org/TR/html4/interact/forms.html#h-17.13.4.1
unsigned length = string.length();
for (unsigned i = 0; i < length; ++i) {
unsigned char c = string.data()[i];
if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') || strchr(safeCharacters, c))
append(buffer, c);
else if (c == ' ')
append(buffer, '+');
else if (c == '\n' || (c == '\r' && (i + 1 >= length || string.data()[i + 1] != '\n')))
append(buffer, "%0D%0A");
else if (c != '\r') {
append(buffer, '%');
appendByteAsHex(c, buffer);
}
}
}
}
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