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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <dirent.h>
#include <sys/types.h>
#include <fcgiapp.h>
#include <functional>
#include <filesystem>
#include <regex>
#include <string>
#include <unordered_map>
#include <boost/algorithm/string/predicate.hpp>
#include <boost/algorithm/string/trim.hpp>
#include <boost/property_tree/xml_parser.hpp>
#include "file.h"
namespace pt = boost::property_tree;
using namespace std::string_literals;
namespace fs = std::filesystem;
namespace {
class TempDir
{
private:
fs::path m_path;
fs::path m_oldpath;
public:
TempDir()
{
char templ[] = "/tmp/downtubeXXXXXX";
char *temp = mkdtemp(templ);
if (temp == nullptr) {
throw std::runtime_error("Can't create temporary directory.");
}
m_path = temp;
m_oldpath = fs::current_path();
fs::current_path(m_path);
}
~TempDir()
{
fs::current_path(m_oldpath);
fs::remove_all(m_path);
}
const fs::path& getPath() const {return m_path;}
};
std::regex re{"https?://(www\\.youtube\\.com/watch\\?v=|youtu\\.be/)[[:alnum:]_&=-]+", std::regex::extended}; // www.youtube.com/watch?v=ItjMIxS3-rI or https://youtu.be/ItjMIxS3-rI
} // anonymous namespace
int main(void)
{
int result = FCGX_Init();
if (result != 0) { // error on init
fprintf(stderr, "Error: FCGX_Init()\n");
return 1;
}
result = FCGX_IsCGI();
if (result) {
fprintf(stderr, "Error: No FCGI environment available.\n");
return 1;
}
FCGX_Request request;
result = FCGX_InitRequest(&request, 0, 0);
if (result != 0) {
fprintf(stderr, "Error: FCGX_InitRequest()\n");
return 1;
}
while (FCGX_Accept_r(&request) >= 0) {
try {
char* method = FCGX_GetParam("REQUEST_METHOD", request.envp);
// POST for server actions, changes
if (!strcmp(method, "POST")) {
size_t contentLength { std::stoul(FCGX_GetParam("CONTENT_LENGTH", request.envp)) };
std::string postData(contentLength, '\0'); // contentLength number of bytes, initialize with 0
if (FCGX_GetStr(postData.data(), contentLength, request.in) != contentLength) {
throw std::runtime_error("Bad data read: Content length mismatch.\r\n");
}
// postData contains POST data
std::string contentType(FCGX_GetParam("CONTENT_TYPE", request.envp));
std::string xmlData = postData; // default: interpret whole POST data as xml request
pt::ptree xml;
std::istringstream ss{xmlData};
pt::xml_parser::read_xml(ss, xml, pt::xml_parser::no_comments | pt::xml_parser::trim_whitespace);
std::string url {xml.get<std::string>("request.url")};
std::string format {xml.get<std::string>("request.format")};
std::string command {xml.get<std::string>("request.command")};
//FCGX_PutS("Content-Type: text/plain\r\n\r\n", request.out);
//FCGX_FPrintF(request.out, "url: %s\r\n", url.c_str());
//FCGX_FPrintF(request.out, "format: %s\r\n", format.c_str()); // mp3, mp4
if (format != "mp3" && format != "mp4") {
throw std::runtime_error("Bad format: "s + format);
}
if (!std::regex_match(url, re)) {
throw std::runtime_error("Bad URL");
}
// remove trailing "&..."
size_t and_pos {url.find('&')};
if (and_pos != std::string::npos)
url = url.substr(0, and_pos);
//FCGX_FPrintF(request.out, "command: %s\r\n", command.c_str());
TempDir tempDir;
//FCGX_FPrintF(request.out, "path: %s\r\n", tempDir.getPath().string().c_str());
if (command == "getfilename") {
//std::string cmd{"youtube-dl -o '%(title)s."s + format + "' --get-filename --no-call-home --restrict-filenames "s + url + " > filename.txt"};
// Recoding to MP4 is too slow currently. So keep original format for now
std::string cmd{"youtube-dl -o '%(title)s.%(ext)s' --get-filename --no-call-home --restrict-filenames "s + url + " > filename.txt"};
if (system(cmd.c_str()))
throw std::runtime_error("Can't guess filename");
std::string filename {File::getFile("filename.txt")};
boost::algorithm::trim(filename);
if (format == "mp3")
filename = fs::path{filename}.stem().string() + ".mp3";
FCGX_PutS("Content-Type: text/plain\r\n\r\n", request.out);
FCGX_FPrintF(request.out, "%s", filename.c_str());
} else if (command == "getfile") {
if (format == "mp3") {
std::string cmd{"youtube-dl --no-warnings --no-call-home --no-progress -x --audio-format mp3 -o 'audio.%(ext)s' --restrict-filenames "s + url};
system(cmd.c_str()); // Ignore error - "ERROR: Stream #1:0 -> #0:1 (copy)" - seems to be ok
std::string filedata {File::getFile("audio.mp3")}; // may throw
if (filedata.size() > 30000000)
throw std::runtime_error("File too big");
FCGX_PutS("Content-Type: application/octet-stream\r\n", request.out);
FCGX_FPrintF(request.out, "Content-Length: %d\r\n\r\n", filedata.size());
FCGX_PutStr(filedata.c_str(), filedata.size(), request.out);
} else if (format == "mp4") {
//std::string cmd{"youtube-dl --no-warnings --no-call-home --no-progress --recode-video mp4 -o video.mp4 --restrict-filenames "s + url};
// Recoding to MP4 is too slow currently. So keep original format for now
std::string cmd{"youtube-dl --no-warnings --no-call-home --no-progress -o video.mp4 --restrict-filenames "s + url};
system(cmd.c_str()); // Ignore error
// youtube-dl gets it wrong and creates, e.g. video.mkv.
// So find it and load it
fs::directory_iterator di{fs::current_path()};
fs::path filename;
for (const auto& i: di) {
if (boost::algorithm::starts_with(i.path().filename().string(), "video."s)) {
filename = i.path().filename().string();
break;
}
}
if (filename.empty()) {
throw std::runtime_error("No video file found.");
}
std::string filedata {File::getFile(filename)}; // may throw
if (filedata.size() > 300000000)
throw std::runtime_error("File too big");
FCGX_PutS("Content-Type: application/octet-stream\r\n", request.out);
FCGX_FPrintF(request.out, "Content-Length: %d\r\n\r\n", filedata.size());
FCGX_PutStr(filedata.c_str(), filedata.size(), request.out);
} else {
throw std::runtime_error("Bad format for unknown reason: "s + format); // should have been caught above already!
}
} else {
throw std::runtime_error("Bad command: "s + command);
}
// Name:
// youtube-dl -o "%(title)s.mp3" --get-filename --no-call-home --restrict-filenames $SOURCE > filename.txt
//
// MP3:
// youtube-dl --no-warnings --no-call-home --no-progress -x --audio-format mp3 --embed-thumbnail -o "%(title)s.(ext)s" --restrict-filenames $SOURCE
//
// MP4:
// youtube-dl --no-warnings --no-call-home --no-progress --recode-video mp4 -o "%(title)s.(ext)s" --restrict-filenames $SOURCE
} else {
throw std::runtime_error("Unsupported method.\r\n");
}
} catch (const std::runtime_error& ex) {
FCGX_PutS("Status: 500 Internal Server Error\r\n", request.out);
FCGX_PutS("Content-Type: text/html\r\n\r\n", request.out);
FCGX_FPrintF(request.out, "Error: %s\r\n", ex.what());
} catch (const std::exception& ex) {
FCGX_PutS("Status: 500 Internal Server Error\r\n", request.out);
FCGX_PutS("Content-Type: text/html\r\n\r\n", request.out);
FCGX_FPrintF(request.out, "Unknown exception: %s\r\n", ex.what());
}
}
return 0;
}
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