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/*
Copyright (C) 2025 Selwin van Dijk
This file is part of signalbackup-tools.
signalbackup-tools 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 3 of the License, or
(at your option) any later version.
signalbackup-tools 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 signalbackup-tools. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef SIGNALPLAINTEXTBACKUPATTACHMENTREADER_H_
#define SIGNALPLAINTEXTBACKUPATTACHMENTREADER_H_
#include "../baseattachmentreader/baseattachmentreader.h"
#include "../framewithattachment/framewithattachment.h"
#include "../base64/base64.h"
#include <tuple>
class SignalPlainTextBackupAttachmentReader : public AttachmentReader<SignalPlainTextBackupAttachmentReader>
{
std::string const d_base64data;
std::string d_filename;
long long int d_pos;
long long int d_size; // size of the base64 string data
long long int d_truesize;
public:
inline explicit SignalPlainTextBackupAttachmentReader(std::string const &b64data, std::string const &filename = std::string(),
long long int pos = -1, long long int size = -1);
SignalPlainTextBackupAttachmentReader(SignalPlainTextBackupAttachmentReader const &other) = default;
SignalPlainTextBackupAttachmentReader(SignalPlainTextBackupAttachmentReader &&other) = default;
SignalPlainTextBackupAttachmentReader &operator=(SignalPlainTextBackupAttachmentReader const &other) = default;
SignalPlainTextBackupAttachmentReader &operator=(SignalPlainTextBackupAttachmentReader &&other) = default;
virtual ~SignalPlainTextBackupAttachmentReader() override = default;
inline virtual int getAttachment(FrameWithAttachment *frame, bool verbose) override;
inline int getAttachmentData(unsigned char **data, bool verbose);
inline long long int dataSize();
//inline virtual void clearData() override;
};
SignalPlainTextBackupAttachmentReader::SignalPlainTextBackupAttachmentReader(std::string const &b64data, std::string const &filename,
long long int pos, long long int size)
:
d_base64data(b64data),
d_filename(filename),
d_pos(pos),
d_size(size),
d_truesize(-1)
{}
inline int SignalPlainTextBackupAttachmentReader::getAttachment(FrameWithAttachment *frame, bool verbose) // virtual
{
unsigned char *data = nullptr;
int ret = getAttachmentData(&data, verbose);
if (ret == 0)
frame->setAttachmentDataBacked(data, d_truesize); // NOTE: test this when d_filename.empty()
return ret;
}
inline int SignalPlainTextBackupAttachmentReader::getAttachmentData(unsigned char **data, bool verbose)
{
// read the data if needed
std::string local_b64_data;
if (d_size > 0 && d_base64data.empty() && !d_filename.empty())
{
std::ifstream file(std::filesystem::path(d_filename), std::ios_base::binary | std::ios_base::in);
if (!file.is_open())
{
Logger::error("Failed to open file '", d_filename, "' for reading attachment");
return 1;
}
if (!file.seekg(d_pos))
{
Logger::error("Failed to seek to correct offset in file '", d_filename, " (", d_pos, ")");
return 1;
}
if (verbose) [[unlikely]]
Logger::message("Reading attachment data, length: ", d_size);
local_b64_data.reserve(d_size + 1);
std::istreambuf_iterator<char> file_it(file);
std::copy_n(file_it, d_size, std::back_inserter<std::string>(local_b64_data));
if (file.tellg() != (d_pos + d_size - 1))
{
Logger::error("Failed to read base64-encoded attachment from \"", d_filename, "\"");
return 1;
}
}
if (d_size > 0 && d_base64data.empty() && local_b64_data.empty()) // filename.empty(), but so is data, while size is > 0
{
Logger::error("SignalPlainTextBackupAttachmentReader has no base64 encoded data");
return 1;
}
unsigned char *attdata;
std::tie(attdata, d_truesize) = Base64::base64StringToBytes(d_base64data.empty() ? local_b64_data : d_base64data);
if (!attdata)
{
d_truesize = -1; // truesize was set 0 by failed base64decode, reset to -1 to mark 'unset'
Logger::error("Failed to decode base64-encoded attachment.");// from \"", d_filename, "\"");
Logger::error_indent("Base64 data: ", d_base64data.substr(0, 10), (d_base64data.size() > 10 ? "..." : ""));
Logger::error_indent("Filename: '", d_filename, "'");
Logger::error_indent("Offset: ", d_pos);
Logger::error_indent("Size: ", d_size);
return 1;
}
*data = attdata;
return 0;
}
inline long long int SignalPlainTextBackupAttachmentReader::dataSize()
{
if (d_truesize == -1)
{
if (d_base64data.empty() && !d_filename.empty())
{
std::ifstream file(std::filesystem::path(d_filename), std::ios_base::binary | std::ios_base::in);
if (!file.is_open())
{
Logger::error("Failed to open file '", d_filename, "' for reading attachment");
return 1;
}
if (!file.seekg(d_pos + d_size - 2)) // we want the last two characters to check if they are padding
{
Logger::error("Failed to seek to correct offset in file '", d_filename, " (", d_pos, ")");
return 1;
}
int numpadding = 0;
char ch = file.get();
if (ch == '=')
++numpadding;
ch = file.get();
if (ch == '=')
++numpadding;
d_truesize = ((d_size / 4) * 3) - numpadding;
}
else
{
int numpadding = 0;
if (d_base64data.size() > 0 && d_base64data[d_base64data.size() - 1] == '=')
{
++numpadding;
if (d_base64data.size() > 1 && d_base64data[d_base64data.size() - 2] == '=')
++numpadding;
}
d_truesize = ((d_base64data.size() / 4) * 3) - numpadding;
}
}
return d_truesize;
}
// inline void SignalPlainTextBackupAttachmentReader::clearData()
// {
// if (!d_filename.empty() && d_pos != -1)
// std::string().swap(d_base64data); // this is pretty ugly...
// }
#endif
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