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/*
Copyright (C) 2024 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic 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 2 of the License, or
(at your option) any later version.
DCP-o-matic 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 DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "cross.h"
#include "dcpomatic_log.h"
#include "dcpomatic_socket.h"
#include "http_server.h"
#include "show_playlist_content_store.h"
#include "show_playlist_list.h"
#include "util.h"
#include "variant.h"
#include <dcp/raw_convert.h>
#include <nlohmann/json.hpp>
#include <boost/algorithm/string.hpp>
#include <stdexcept>
#include <utility>
using std::make_pair;
using std::make_shared;
using std::runtime_error;
using std::shared_ptr;
using std::string;
using std::vector;
using boost::optional;
Response Response::ERROR_404 = { 404, "<html><head><title>Error 404</title></head><body><h1>Error 404</h1></body></html>"};
HTTPServer::HTTPServer(int port, int timeout)
: Server(port, timeout)
{
}
Response::Response(int code)
: _code(code)
{
}
Response::Response(int code, string payload)
: _code(code)
, _payload(payload)
{
}
void
Response::add_header(string key, string value)
{
_headers.push_back(make_pair(key, value));
}
void
Response::send(shared_ptr<Socket> socket)
{
socket->write(String::compose("HTTP/1.1 %1 OK\r\n", _code));
switch (_type) {
case Type::HTML:
socket->write("Content-Type: text/html; charset=utf-8\r\n");
break;
case Type::JSON:
socket->write("Content-Type: text/json; charset=utf-8\r\n");
break;
}
socket->write(String::compose("Content-Length: %1\r\n", _payload.length()));
for (auto const& header: _headers) {
socket->write(String::compose("%1: %2\r\n", header.first, header.second));
}
socket->write("\r\n");
socket->write(_payload);
}
Response
HTTPServer::get(string const& url)
{
if (url == "/") {
return Response(200, String::compose(dcp::file_to_string(resources_path() / "web" / "index.html"), variant::dcpomatic_player()));
} else if (url == "/playlists") {
return Response(200, String::compose(dcp::file_to_string(resources_path() / "web" / "playlists.html"), variant::dcpomatic_player()));
} else if (url == "/api/v1/status") {
nlohmann::json json;
{
boost::mutex::scoped_lock lm(_mutex);
json["playing"] = _playing;
json["position"] = seconds_to_hms(_position.seconds());
json["dcp_name"] = _dcp_name;
}
auto response = Response(200, json.dump());
response.set_type(Response::Type::JSON);
return response;
} else if (url == "/api/v1/playlists") {
ShowPlaylistList spl_list;
nlohmann::json json;
for (auto const& spl: spl_list.show_playlists()) {
json.push_back(spl.second.as_json());
}
auto response = Response(200, json.dump());
response.set_type(Response::Type::JSON);
return response;
} else if (boost::algorithm::starts_with(url, "/api/v1/playlist/")) {
vector<string> parts;
boost::algorithm::split(parts, url, boost::is_any_of("/"));
if (parts.size() != 5) {
return Response::ERROR_404;
}
ShowPlaylistList spl_list;
for (auto const& spl: spl_list.show_playlists()) {
if (spl.second.uuid() == parts[4]) {
// XXX
// auto response = Response(200, spl->as_json_with_content().dump());
// response.set_type(Response::Type::JSON);
// return response;
}
}
return Response::ERROR_404;
} else if (url == "/api/v1/content") {
nlohmann::json json;
for (auto i: ShowPlaylistContentStore::instance()->all()) {
json.push_back(i.as_json());
}
auto response = Response(200, json.dump());
response.set_type(Response::Type::JSON);
return response;
} else if (boost::algorithm::starts_with(url, "/api/v1/content/")) {
vector<string> parts;
boost::algorithm::split(parts, url, boost::is_any_of("/"));
if (parts.size() != 5) {
return Response::ERROR_404;
}
auto content = ShowPlaylistContentStore::instance()->get(parts[4]);
if (!content) {
return Response::ERROR_404;
}
auto json = content->as_json();
auto response = Response(200, json.dump());
response.set_type(Response::Type::JSON);
return response;
} else {
LOG_HTTP("404 %1", url);
return Response::ERROR_404;
}
}
Response
HTTPServer::post(string const& url, vector<uint8_t> const& body)
{
if (url == "/api/v1/play") {
emit(boost::bind(boost::ref(Play)));
auto response = Response(303);
response.add_header("Location", "/");
return response;
} else if (url == "/api/v1/stop") {
emit(boost::bind(boost::ref(Stop)));
auto response = Response(303);
response.add_header("Location", "/");
return response;
} else if (boost::algorithm::starts_with(url, "/api/v1/playlist/")) {
vector<string> parts;
boost::algorithm::split(parts, url, boost::is_any_of("/"));
if (parts.size() != 6 || parts[5] != "insert") {
return Response::ERROR_404;
}
bool found = false;
ShowPlaylistList spl_list;
for (auto const& spl: spl_list.show_playlists()) {
if (spl.second.uuid() == parts[4]) {
nlohmann::json details = nlohmann::json::parse(body);
// XXX
// spl->insert(
// SPLEntry(ContentStore::instance()->get(details["digest"])),
// details["before"].is_null() ? optional<string>() : details["before"].get<string>()
// );
// if (auto dir = Config::instance()->player_playlist_directory()) {
// spl->write(*dir / (spl->id() + ".xml"));
// }
found = true;
}
}
if (!found) {
return Response::ERROR_404;
}
return Response(201);
} else {
return Response::ERROR_404;
}
}
Response
HTTPServer::request(vector<string> const& request, vector<uint8_t> const& body)
{
vector<string> parts;
boost::split(parts, request[0], boost::is_any_of(" "));
if (parts.size() != 3) {
return Response::ERROR_404;
}
try {
if (parts[0] == "GET") {
LOG_HTTP("GET %1", parts[1]);
return get(parts[1]);
} else if (parts[0] == "POST") {
LOG_HTTP("POST %1", parts[1]);
return post(parts[1], body);
}
} catch (std::exception& e) {
LOG_ERROR("Error while handling HTTP request: %1", e.what());
} catch (...) {
LOG_ERROR_NC("Unknown exception while handling HTTP request");
}
LOG_HTTP("404 %1", parts[0]);
return Response::ERROR_404;
}
void
HTTPServer::handle(shared_ptr<Socket> socket)
{
class Reader
{
public:
void read_block(boost::system::error_code const& ec, uint8_t* data, std::size_t size)
{
if (ec.value() != boost::system::errc::success) {
_close = true;
_error_code = ec;
return;
}
for (std::size_t i = 0; i < size; ++i) {
switch (_state) {
case State::HEADER:
if (_line.length() >= 1024) {
_close = true;
return;
}
_line += data[i];
if (_line.length() >= 2 && _line.substr(_line.length() - 2) == "\r\n") {
/* Got a line */
if (_line.length() == 2) {
_state = BODY;
} else if (_request.size() > 64) {
_close = true;
return;
} else if (_line.size() >= 2) {
_line = _line.substr(0, _line.length() - 2);
LOG_HTTP("Receive: %1", _line);
if (_request.empty()) {
_method = _line.substr(0, _line.find(' '));
}
string lower_case = _line;
transform(lower_case.begin(), lower_case.end(), lower_case.begin(), ::tolower);
auto const colon = lower_case.find(':');
string const key = lower_case.substr(0, colon);
string value = colon != std::string::npos ? lower_case.substr(colon + 1): "";
boost::trim(value);
if (key == "content-length") {
_content_length = dcp::raw_convert<int>(value);
}
_request.push_back(_line);
_line = "";
}
}
break;
case State::BODY:
_body.push_back(data[i]);
if (_body.size() > 65536) {
_close = true;
return;
}
break;
}
}
}
bool completed() const {
return _state == State::BODY && (_method == "GET" || (_method == "POST" && static_cast<int>(_body.size()) == _content_length));
}
bool close() const {
return _close;
}
std::vector<uint8_t> body() const {
return _body;
}
boost::system::error_code error_code() const {
return _error_code;
}
std::string method() const {
return _method;
}
vector<std::string> const& request() const {
return _request;
}
private:
enum State {
HEADER,
BODY
} _state = HEADER;
std::string _method;
std::string _line;
vector<std::string> _request;
std::vector<uint8_t> _body;
int _content_length = 0;
bool _close = false;
boost::system::error_code _error_code;
};
Reader reader;
vector<uint8_t> buffer(2048);
socket->set_deadline_from_now(2);
socket->socket().async_read_some(
boost::asio::buffer(buffer.data(), buffer.size()),
[&reader, &buffer, socket](boost::system::error_code const& ec, std::size_t bytes_transferred) {
reader.read_block(ec, buffer.data(), bytes_transferred);
});
while (!reader.completed() && !reader.close() && socket->is_open()) {
socket->run();
}
if (reader.completed() && !reader.close()) {
try {
auto response = request(reader.request(), reader.body());
response.send(socket);
} catch (runtime_error& e) {
LOG_ERROR_NC(e.what());
}
}
/* I think we should keep the socket open if the client requested keep-alive, but some browsers
* send keep-alive then don't re-use the connection. Since we can only accept one request at once,
* this blocks until our request read (above) times out. We probably should accept multiple
* requests in parallel, but it's easier for not to use close the socket.
*/
socket->close();
}
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