131 lines
4.7 KiB
C++
131 lines
4.7 KiB
C++
/*
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* Copyright (C) 2020 Emeric Poupon
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*
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* This file is part of LMS.
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*
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* LMS is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* LMS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with LMS. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "FileResourceHandler.hpp"
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#include <algorithm>
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#include "core/ILogger.hpp"
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#include "core/MimeTypes.hpp"
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namespace lms::core
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{
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std::unique_ptr<IResourceHandler> createFileResourceHandler(const std::filesystem::path& path, std::string_view mimeType)
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{
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return std::make_unique<FileResourceHandler>(path, mimeType.empty() ? getMimeType(path.extension()) : mimeType);
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}
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FileResourceHandler::FileResourceHandler(const std::filesystem::path& path, std::string_view mimeType)
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: _mimeType{ mimeType }
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, _ifs{ path, std::ios::in | std::ios::binary }
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{
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if (!_ifs)
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LMS_LOG(UTILS, ERROR, "Cannot open file stream for " << path);
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else
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{
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_ifs.seekg(0, std::ios::end);
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if (!_ifs.fail())
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_fileSize = static_cast<::uint64_t>(_ifs.tellg());
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LMS_LOG(UTILS, DEBUG, "File " << path << ", fileSize = " << _fileSize);
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}
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}
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Wt::Http::ResponseContinuation* FileResourceHandler::processRequest(const Wt::Http::Request& request, Wt::Http::Response& response)
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{
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if (_offset == 0)
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{
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if (!_ifs)
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{
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response.setStatus(404);
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return {};
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}
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response.addHeader("Accept-Ranges", "bytes");
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const Wt::Http::Request::ByteRangeSpecifier ranges{ request.getRanges(_fileSize) };
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if (!ranges.isSatisfiable())
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{
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std::ostringstream contentRange;
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contentRange << "bytes */" << _fileSize;
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response.setStatus(416); // Requested range not satisfiable
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response.addHeader("Content-Range", contentRange.str());
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LMS_LOG(UTILS, DEBUG, "Range not satisfiable");
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return {};
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}
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if (ranges.size() == 1)
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{
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LMS_LOG(UTILS, DEBUG, "Range requested = " << ranges[0].firstByte() << "-" << ranges[0].lastByte());
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response.setStatus(206);
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_offset = ranges[0].firstByte();
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_beyondLastByte = ranges[0].lastByte() + 1;
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std::ostringstream contentRange;
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contentRange << "bytes " << _offset << "-"
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<< _beyondLastByte - 1 << "/" << _fileSize;
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response.addHeader("Content-Range", contentRange.str());
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response.setContentLength(_beyondLastByte - _offset);
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}
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else
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{
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LMS_LOG(UTILS, DEBUG, "No range requested");
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response.setStatus(200);
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_beyondLastByte = _fileSize;
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response.setContentLength(_beyondLastByte);
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}
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LMS_LOG(UTILS, DEBUG, "Mimetype set to '" << _mimeType << "'");
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response.setMimeType(_mimeType);
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_ifs.seekg(static_cast<std::istream::pos_type>(_offset));
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} // end initial response setup
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::uint64_t restSize = _beyondLastByte - _offset;
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::uint64_t pieceSize = std::min(restSize, static_cast<::uint64_t>(_chunkSize));
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std::vector<char> buf(pieceSize);
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_ifs.read(buf.data(), buf.size());
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const ::uint64_t actualPieceSize{ static_cast<::uint64_t>(_ifs.gcount()) };
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if (actualPieceSize > 0)
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{
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response.out().write(buf.data(), actualPieceSize);
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LMS_LOG(UTILS, DEBUG, "Written " << actualPieceSize << " bytes, range = " << _offset << "-" << _offset + actualPieceSize - 1 << "");
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}
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else
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LMS_LOG(UTILS, DEBUG, "Written 0 byte");
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if (!_ifs.good())
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LMS_LOG(UTILS, WARNING, "Error reading from file!");
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else if (actualPieceSize < restSize)
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{
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_offset += actualPieceSize;
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LMS_LOG(UTILS, DEBUG, "Job not complete! Remaining range: " << _offset << "-" << _beyondLastByte - 1);
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return response.createContinuation();
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}
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LMS_LOG(UTILS, DEBUG, "Job complete!");
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return nullptr;
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}
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} // namespace lms::core
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