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#include "MIDIPlayer.h"
#include <stdexcept>
#include <string>
#include <fcgiapp.h>
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/xml_parser.hpp>
#include <fmt/format.h>
namespace pt = boost::property_tree;
using namespace std::string_literals;
namespace {
class PostData
{
public:
PostData(FCGX_Request& request) {
std::string result;
std::string contentLengthString(FCGX_GetParam("CONTENT_LENGTH", request.envp));
int contentLength = std::stoul(contentLengthString);
result.resize(contentLength);
unsigned int status = FCGX_GetStr(result.data(), result.size(), request.in);
if (status != result.size()) {
throw std::runtime_error(fmt::format("Read error: {}/{}", status, result.size()));
}
m_data = result;
}
std::string getData()
{
return m_data;
}
// path: xml path, e.g. data.value
std::string getXMLElement(const std::string& path)
{
pt::ptree tree{};
std::istringstream iss{m_data};
pt::read_xml(iss, tree, pt::xml_parser::trim_whitespace);
return tree.get<std::string>(path);
}
private:
std::string m_data;
};
std::string getCommand(FCGX_Request& request)
{
std::string query = FCGX_GetParam("QUERY_STRING", request.envp);
size_t pos = query.find("command=");
if (pos != query.npos) {
return query.substr(pos + 8);
} else {
return {};
}
}
std::string to_xml(const std::vector<std::string>& filelist, const std::string& selected)
{
std::string result{"<data><status>ok</status><list>"};
for (const auto& i: filelist) {
result += "<filename>" + i + "</filename>";
}
result += "</list>";
result += "<selected>" + selected + "</selected>";
return result + "</data>";
}
} // namespace
int main(int argc, char* argv[]) {
MIDIPlayer player;
std::string ok_data{"<data><status>ok</status><message>OK</message></data>"};
std::string error_data{"<data><status>error</status><message>General Error</message></data>"};
int result = FCGX_Init();
if (result != 0) {
return 1; // error on init
}
FCGX_Request request;
if (FCGX_InitRequest(&request, 0, 0) != 0) {
return 1; // error on init
}
while (FCGX_Accept_r(&request) == 0) {
std::string method = FCGX_GetParam("REQUEST_METHOD", request.envp);
try {
if (method == "POST") {
FCGX_PutS("Content-Type: text/xml\r\n\r\n", request.out);
PostData data{request};
std::string command {getCommand(request)};
if (command == "start") {
player.start();
FCGX_PutS(ok_data.c_str(), request.out);
} else if (command == "stop") {
player.stop();
FCGX_PutS(ok_data.c_str(), request.out);
} else if (command == "getlist") {
FCGX_PutS(to_xml(player.get_filelist(), player.get_file()).c_str(), request.out);
} else if (command == "setfile") {
std::string filename = data.getXMLElement("data.value");
player.set_file(filename);
FCGX_PutS(ok_data.c_str(), request.out);
} else {
FCGX_PutS(error_data.c_str(), request.out);
}
} else {
throw std::runtime_error(fmt::format("Bad request method: POST expected, got {}", method).c_str());
}
} catch (const std::exception& ex) {
FCGX_PutS("Content-Type: text/xml\r\n\r\n", request.out);
FCGX_PutS(("<data><status>error</status><message>"s + ex.what() + "</message></data>").c_str(), request.out);
}
}
return 0;
}
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