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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) 2004-2017 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 "Blob.h"
#include <limits>
#include <pal/text/TextEncoding.h>
#include <wtf/Assertions.h>
#include <wtf/CryptographicallyRandomNumber.h>
#include <wtf/HexNumber.h>
#include <wtf/text/CString.h>
#include <wtf/text/StringView.h>
namespace WebCore {
namespace FormDataBuilder {
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 inline void append(Vector<char>& buffer, const Vector<uint8_t>& string)
{
buffer.appendVector(string);
}
static void appendQuoted(Vector<char>& buffer, const Vector<uint8_t>& string)
{
// Append a string as a quoted value, escaping quotes and line breaks.
// FIXME: Is it correct to use percent escaping here? When this code was originally written,
// other browsers were not encoding these characters, so someone should test servers or do
// research to find out if there is an encoding form that works well.
// FIXME: If we want to use percent escaping sensibly, we need to escape "%" characters too.
size_t size = string.size();
for (size_t i = 0; i < size; ++i) {
auto character = string[i];
switch (character) {
case 0xA:
append(buffer, "%0A");
break;
case 0xD:
append(buffer, "%0D");
break;
case '"':
append(buffer, "%22");
break;
default:
append(buffer, character);
}
}
}
// https://url.spec.whatwg.org/#concept-urlencoded-byte-serializer
static void appendFormURLEncoded(Vector<char>& buffer, const uint8_t* string, size_t length)
{
static const char safeCharacters[] = "-._*";
for (size_t i = 0; i < length; ++i) {
auto character = string[i];
if (isASCIIAlphanumeric(character)
|| (character != '\0' && strchr(safeCharacters, character)))
append(buffer, character);
else if (character == ' ')
append(buffer, '+');
else if (character == '\n' || (character == '\r' && (i + 1 >= length || string[i + 1] != '\n')))
append(buffer, "%0D%0A"); // FIXME: Unclear exactly where this rule about normalizing line endings to CRLF comes from.
else if (character != '\r') {
append(buffer, '%');
auto hexBuffer = hex(character, 2);
append(buffer, hexBuffer.characters()[0]);
append(buffer, hexBuffer.characters()[1]);
}
}
}
static void appendFormURLEncoded(Vector<char>& buffer, const Vector<uint8_t>& string)
{
appendFormURLEncoded(buffer, string.data(), string.size());
}
Vector<char> 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 7-bit ASCII alphanumeric characters.
for (unsigned i = 0; i < 4; ++i) {
unsigned randomness = cryptographicallyRandomNumber<unsigned>();
boundary.append(alphaNumericEncodingMap[(randomness >> 24) & 0x3F]);
boundary.append(alphaNumericEncodingMap[(randomness >> 16) & 0x3F]);
boundary.append(alphaNumericEncodingMap[(randomness >> 8) & 0x3F]);
boundary.append(alphaNumericEncodingMap[randomness & 0x3F]);
}
boundary.append(0); // Add a 0 at the end so we can use this as a C-style string.
return boundary;
}
void beginMultiPartHeader(Vector<char>& buffer, const CString& boundary, const Vector<uint8_t>& 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=\"");
appendQuoted(buffer, name);
append(buffer, '"');
}
void addBoundaryToMultiPartHeader(Vector<char>& buffer, const CString& boundary, bool isLastBoundary)
{
append(buffer, "--");
append(buffer, boundary);
if (isLastBoundary)
append(buffer, "--");
append(buffer, "\r\n");
}
void addFilenameToMultiPartHeader(Vector<char>& buffer, const PAL::TextEncoding& encoding, const String& filename)
{
append(buffer, "; filename=\"");
appendQuoted(buffer, encoding.encode(filename, PAL::UnencodableHandling::Entities));
append(buffer, '"');
}
void addContentTypeToMultiPartHeader(Vector<char>& buffer, const CString& mimeType)
{
ASSERT(Blob::isNormalizedContentType(mimeType));
append(buffer, "\r\nContent-Type: ");
append(buffer, mimeType);
}
void finishMultiPartHeader(Vector<char>& buffer)
{
append(buffer, "\r\n\r\n");
}
void addKeyValuePairAsFormData(Vector<char>& buffer, const Vector<uint8_t>& key, const Vector<uint8_t>& value, FormData::EncodingType encodingType)
{
if (encodingType == FormData::EncodingType::TextPlain) {
append(buffer, key);
append(buffer, '=');
append(buffer, value);
append(buffer, "\r\n");
} else {
if (!buffer.isEmpty())
append(buffer, '&');
appendFormURLEncoded(buffer, key);
append(buffer, '=');
appendFormURLEncoded(buffer, value);
}
}
void encodeStringAsFormData(Vector<char>& buffer, const CString& string)
{
appendFormURLEncoded(buffer, string.dataAsUInt8Ptr(), string.length());
}
}
}
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