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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 "cross.h"
#include "dcpomatic_log.h"
#include "dcpomatic_socket.h"
#include "http_server.h"
#include "show_playlist.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>
using std::make_pair;
using std::pair;
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>"};
Response Response::ERROR_500 = { 500, "<html><head><title>Error 500</title></head><body><h1>Error 500</h1></body></html>"};
HTTPServer::HTTPServer(int port, int timeout)
: Server(port, timeout)
{
}
Response::Response(int code)
: _code(code)
{
}
Response::Response(int code, string payload, Type type)
: _code(code)
, _type(type)
, _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(fmt::format("HTTP/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;
case Type::CSS:
socket->write("Content-Type: text/css; charset=utf-8\r\n");
break;
case Type::PNG:
socket->write("Content-Type: image/png;\r\n");
break;
}
socket->write(fmt::format("Content-Length: {}\r\n", _payload.length()));
for (auto const& header: _headers) {
socket->write(fmt::format("{}: {}\r\n", header.first, header.second));
}
socket->write("\r\n");
socket->write(_payload);
}
void
HTTPServer::substitute(string& page) const
{
boost::algorithm::replace_all(page, "TITLE", variant::dcpomatic_player());
boost::algorithm::replace_all(page, "SIDEBAR", dcp::file_to_string(resources_path() / "web" / "sidebar.html"));
}
Response
HTTPServer::get_request(string const& url)
{
if (url == "/") {
auto page = dcp::file_to_string(resources_path() / "web" / "index.html");
substitute(page);
return Response(200, page);
} else if (url == "/playlists") {
auto page = dcp::file_to_string(resources_path() / "web" / "playlists.html");
substitute(page);
return Response(200, page);
} else if (url == "/common.css") {
auto page = dcp::file_to_string(resources_path() / "web" / "common.css");
return Response(200, page, Response::Type::CSS);
} else if (url == "/dom.png") {
auto page = dcp::file_to_string(resources_path() / "web" / "dom.png");
return Response(200, page, Response::Type::PNG);
} 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;
}
return Response(200, json.dump(), Response::Type::JSON);
} else if (url == "/api/v1/playlists") {
ShowPlaylistList list;
nlohmann::json json;
for (auto spl: list.show_playlists()) {
json.push_back(spl.second.as_json());
}
return Response(200, json.dump(), Response::Type::JSON);
} else if (url == "/api/v1/current-playlist") {
nlohmann::json json;
boost::mutex::scoped_lock lm(_mutex);
for (auto entry: _current_playlist) {
json.push_back(entry);
}
return Response(200, json.dump(), Response::Type::JSON);
} 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;
}
/* XXX: converting to JSON this way feels a bit grotty */
auto json = ShowPlaylistEntry(content, {}).as_json();
return Response(200, json.dump(), Response::Type::JSON);
} 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 list;
auto playlist_id = list.get_show_playlist_id(parts[4]);
if (!playlist_id) {
return Response::ERROR_404;
}
auto playlist = list.show_playlist(*playlist_id);
if (!playlist) {
return Response::ERROR_404;
}
nlohmann::json json = playlist->as_json();
json["content"] = nlohmann::json::array();
auto entries = list.entries(parts[4]);
for (auto entry: list.entries(parts[4])) {
json["content"].push_back(entry.as_json());
}
return Response(200, json.dump(), Response::Type::JSON);
} else if (url == "/api/v1/content") {
nlohmann::json json;
for (auto i: ShowPlaylistContentStore::instance()->all()) {
/* XXX: converting to JSON this way feels a bit grotty */
json.push_back(ShowPlaylistEntry(i, {}).as_json());
}
return Response(200, json.dump(), Response::Type::JSON);
} 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;
}
/* XXX: converting to JSON this way feels a bit grotty */
auto json = ShowPlaylistEntry(content, {}).as_json();
return Response(200, json.dump(), Response::Type::JSON);
} else {
LOG_HTTP("404 {}", url);
return Response::ERROR_404;
}
}
Response
HTTPServer::post_request(string const& url, string 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 (url == "/api/v1/load-playlist") {
nlohmann::json details = nlohmann::json::parse(body);
vector<pair<string, boost::optional<float>>> entries;
for (auto const& entry: details["entries"]) {
if (!entry.contains("uuid")) {
continue;
}
boost::optional<float> crop;
if (entry.contains("crop_to_ratio")) {
crop = entry["crop_to_ratio"];
}
entries.push_back({entry["uuid"], crop});
}
emit(boost::bind(boost::ref(LoadPlaylist), entries));
/* XXX: return a failure if LoadPlaylist fails */
return Response(200);
} else if (url == "/api/v1/playlists") {
ShowPlaylist playlist("New Playlist");
ShowPlaylistList list;
list.add_show_playlist(playlist);
return Response(200);
} 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) {
return Response::ERROR_404;
}
ShowPlaylistList list;
auto playlist_id = list.get_show_playlist_id(parts[4]);
if (!playlist_id) {
return Response::ERROR_404;
}
nlohmann::json details = nlohmann::json::parse(body);
if (parts[5] == "insert") {
auto content = ShowPlaylistContentStore::instance()->get(details["uuid"]);
if (!content) {
return Response::ERROR_404;
}
list.insert_entry(*playlist_id, ShowPlaylistEntry(content, {}), details["index"]);
} else if (parts[5] == "move") {
list.move_entry(*playlist_id, details["old_index"], details["new_index"]);
} else if (parts[5] == "rename") {
if (auto playlist = list.show_playlist(*playlist_id)) {
playlist->set_name(details["name"]);
list.update_show_playlist(*playlist_id, *playlist);
}
} else {
return Response::ERROR_404;
}
return Response(200);
} else {
return Response::ERROR_404;
}
}
Response
HTTPServer::delete_request(string const& url)
{
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 list;
auto playlist_id = list.get_show_playlist_id(parts[4]);
if (!playlist_id) {
return Response::ERROR_404;
}
list.remove_show_playlist(*playlist_id);
return Response(200);
}
return Response::ERROR_404;
}
Response
HTTPServer::request(vector<string> const& request, string 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 {}", parts[1]);
return get_request(parts[1]);
} else if (parts[0] == "POST") {
LOG_HTTP("POST {}", parts[1]);
return post_request(parts[1], body);
} else if (parts[0] == "DELETE") {
LOG_HTTP("DELETE {}", parts[1]);
return delete_request(parts[1]);
}
} catch (std::exception& e) {
LOG_ERROR("Error while handling HTTP request: {}", e.what());
} catch (...) {
LOG_ERROR("Unknown exception while handling HTTP request");
}
LOG_HTTP("500 {}", parts[0]);
return Response::ERROR_500;
}
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) {
if (_got_request) {
_body += data[i];
} else {
if (_line.length() >= 1024) {
_close = true;
return;
}
_line += data[i];
if (_line.length() >= 2 && _line.substr(_line.length() - 2) == "\r\n") {
if (_line.length() == 2) {
_got_request = true;
} else if (_request.size() > 64) {
_close = true;
return;
} else {
_line = _line.substr(0, _line.length() - 2);
}
if (boost::algorithm::starts_with(_line, "Content-Length:")) {
vector<string> parts;
boost::algorithm::split(parts, _line, boost::is_any_of(":"));
if (parts.size() == 2) {
boost::trim(parts[1]);
_body_length = dcp::raw_convert<int>(parts[1]);
}
}
LOG_HTTP("Receive: {}", _line);
_request.push_back(_line);
_line = "";
}
}
}
}
bool finished() const {
return _got_request && static_cast<int>(_body.length()) == _body_length;
}
bool close() const {
return _close;
}
boost::system::error_code error_code() const {
return _error_code;
}
vector<std::string> const& request() const {
return _request;
}
std::string const& body() const {
return _body;
}
private:
std::string _line;
vector<std::string> _request;
std::string _body;
bool _got_request = false;
bool _close = false;
int _body_length = 0;
boost::system::error_code _error_code;
};
Reader reader;
vector<uint8_t> buffer(2048);
socket->set_deadline_from_now(2);
std::function<void ()> read;
read = [&]() {
socket->socket().async_read_some(
boost::asio::buffer(buffer.data(), buffer.size()),
[&reader, &buffer, socket, &read](boost::system::error_code const& ec, std::size_t bytes_transferred) {
reader.read_block(ec, buffer.data(), bytes_transferred);
read();
});
};
read();
while (!reader.finished() && !reader.close() && socket->is_open()) {
socket->run();
}
if (reader.finished() && !reader.close()) {
try {
auto response = request(reader.request(), reader.body());
response.send(socket);
} catch (runtime_error& e) {
LOG_ERROR(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 now to close the socket.
*/
socket->close();
}
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