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/*
A Command Line YouTube Downloader in C++
Copyright (C) 2024 Mike Nolan
This program 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 3 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <jansson.h>
#include <string>
#include <curl/curl.h>
#include <regex>
#include <iostream>
#include <filesystem>
#include <unistd.h>
const char* license = " GNU GENERAL PUBLIC LICENSE\n"
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"or convey a specific copy of the covered work, then the patent license\n"
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"\n"
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"in the business of distributing software, under which you make payment\n"
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"for and in connection with specific products or compilations that\n"
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"or that patent license was granted, prior to 28 March 2007.\n"
"\n"
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"any implied license or other defenses to infringement that may\n"
"otherwise be available to you under applicable patent law.\n"
"\n"
" 12. No Surrender of Others' Freedom.\n"
"\n"
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"to collect a royalty for further conveying from those to whom you convey\n"
"the Program, the only way you could satisfy both those terms and this\n"
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"\n"
" 13. Use with the GNU Affero General Public License.\n"
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"combination as such.\n"
"\n"
" 14. Revised Versions of this License.\n"
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using namespace std;
class VideoId {
private:
std::string id;
bool hasId=false;
bool IsValid(std::string id)
{
if(id.size() != 11) return false;
for(auto c : id)
{
if(c == '-') continue;
if(c == '_') continue;
if(c >= 'A' && c <= 'Z') continue;
if(c >= 'a' && c <= 'z') continue;
if(c >= '0' && c <= '9') continue;
return false;
}
return true;
}
public:
VideoId(std::string url)
{
if(IsValid(url))
{
hasId=true;
id = url;
return;
}
regex reg("youtube\\..+?/watch.*?v=(.*?)(?:&|/|$)");
smatch m;
regex_search(url,m,reg);
if(m.size() == 2)
{
std::string s = m[1].str();
if(IsValid(s)) {
id = s;
hasId=true;
return;
}
}
reg = regex("youtu\\.be/(.*?)(?:\\?|&|/|$)");
regex_search(url,m,reg);
if(m.size() == 2)
{
std::string s = m[1].str();
if(IsValid(s)) {
id = s;
hasId=true;
return;
}
}
reg = regex("youtube\\..+?/embed/(.*?)(?:\\?|&|/|$)");
regex_search(url,m,reg);
if(m.size() == 2)
{
std::string s = m[1].str();
if(IsValid(s)) {
id = s;
hasId=true;
return;
}
}
reg = regex("youtube\\..+?/shorts/(.*?)(?:\\?|&|/|$)");
regex_search(url,m,reg);
if(m.size() == 2)
{
std::string s = m[1].str();
if(IsValid(s)) {
id = s;
hasId=true;
return;
}
}
reg = regex("youtube\\..+?/live/(.*?)(?:\\?|&|/|$)");
regex_search(url,m,reg);
if(m.size() == 2)
{
std::string s = m[1].str();
if(IsValid(s)) {
id = s;
hasId=true;
return;
}
}
}
std::string Value()
{
return id;
}
bool HasValue()
{
return hasId;
}
};
class MyData {
public:
std::string s;
size_t offset=0;
};
static size_t read_info_json(char *data, size_t size, size_t nmemb, void *clientp)
{
size_t realsize = size * nmemb;
MyData* str = static_cast<MyData*>(clientp);
if(str->s.size() - str->offset < realsize)
realsize = str->s.size() - str->offset;
memcpy(data,str->s.data() + str->offset,realsize);
//fwrite(str->s.data() + str->offset,1,realsize,stderr);
str->offset += realsize;
return realsize;
}
static size_t write_info_json(char *data, size_t size, size_t nmemb, void *clientp)
{
size_t realsize = size * nmemb;
std::string* str = static_cast<std::string*>(clientp);
str->append(data,realsize);
return realsize;
}
json_t* download_info(VideoId& id)
{
CURL* curl = curl_easy_init();
struct curl_slist *headers = curl_slist_append(NULL, "Content-Type: application/json");
curl_slist_append(headers, "User-Agent: com.google.android.youtube/17.36.4 (Linux; U; Android 12; GB) gzip");
std::string json= "{\"videoId\":\"" + id.Value() +"\",\"context\":{\"client\":{\"clientName\":\"ANDROID_TESTSUITE\",\"clientVersion\": \"1.9\",\"androidSdkVersion\":30, \"hl\":\"en\",\"gl\":\"US\",\"utcOffsetMinutes\":0}}}";
///youtubei/v1/player?key=AIzaSyA8eiZmM1FaDVjRy-df2KTyQ_vz_yYM39w
std::string outJson={};
curl_easy_setopt(curl,CURLOPT_HTTPHEADER,headers);
// curl_easy_setopt(curl,CURLOPT_HTTPPOST,json.c_str());
curl_easy_setopt(curl, CURLOPT_POST, 1L);
curl_easy_setopt(curl,CURLOPT_READFUNCTION,read_info_json);
MyData data;
data.s = json;
curl_easy_setopt(curl,CURLOPT_INFILESIZE,(long)json.size());
curl_easy_setopt(curl,CURLOPT_READDATA,static_cast<void*>(&data));
curl_easy_setopt(curl,CURLOPT_WRITEFUNCTION,write_info_json);
curl_easy_setopt(curl,CURLOPT_WRITEDATA,static_cast<void*>(&outJson));
curl_easy_setopt(curl,CURLOPT_HTTP_VERSION,CURL_HTTP_VERSION_1_1);
curl_easy_setopt(curl,CURLOPT_URL,"https://www.youtube.com/youtubei/v1/player?key=AIzaSyA8eiZmM1FaDVjRy-df2KTyQ_vz_yYM39w");
CURLcode c= curl_easy_perform(curl);
curl_easy_cleanup(curl);
return json_loads(outJson.c_str(),0,NULL);
}
bool Invalid(char c)
{
//just do windows because it is the strictist when it comes to windows, mac and linux
if(c >= 0 && c < 32) return true;
if(c == 127) return true;
if(c == '\\') return true;
if(c == '*') return true;
if(c == '/') return true;
if(c == '|') return true;
if(c == ':') return true;
if(c == '<') return true;
if(c == '>') return true;
if(c == '\"') return true;
if(c == '?') return true;
return false;
}
void safe_title(std::string& s,const char* str, size_t len)
{
for(size_t i=0;i<len;i++)
{
if(Invalid(str[i])) continue;
s.push_back(str[i]);
}
}
void download_file(const char* url, std::filesystem::path& file,bool progress=false)
{
CURL* curl = curl_easy_init();
curl_easy_setopt(curl,CURLOPT_URL,url);
FILE* f = fopen(file.c_str(),"wb");
curl_easy_setopt(curl,CURLOPT_WRITEDATA, f);
curl_easy_setopt(curl,CURLOPT_NOPROGRESS,progress ? 0L : 1L);
curl_easy_perform(curl);
curl_easy_cleanup(curl);
auto len=ftell(f);
fclose(f);
if(len == 0)
unlink(file.c_str());
}
void download_video(VideoId& id)
{
auto res=download_info(id);
auto id2= id.Value();
auto details = json_object_get(res,"videoDetails");
if(details != nullptr && json_is_object(details))
{
auto videoTitle = json_object_get(details,"title");
if(videoTitle != nullptr && json_is_string(videoTitle))
{
std::string title={};
safe_title(title,json_string_value(videoTitle),json_string_length(videoTitle));
title.push_back('-');
title.append(id.Value());
std::string fname = title;
fname.append(".mp4");
auto sd = json_object_get(res,"streamingData");
if(sd == nullptr || !json_is_object(sd))
goto end;
auto formats = json_object_get(sd,"formats");
if(formats == nullptr || !json_is_array(formats))
goto end;
auto fmt = json_array_get(formats,0);
if(fmt == nullptr || !json_is_object(fmt))
goto end;
auto url = json_object_get(fmt,"url");
if(url == nullptr || !json_is_string(url))
goto end;
const char* _url=json_string_value(url);
std::filesystem::path fname2 = fname;
std::cout << "Downloading: " << title << std::endl;
download_file(_url,fname2,true);
std::filesystem::path data_dir = title + "_data";
std::filesystem::create_directory(data_dir);
auto meta=data_dir / "metadata.json";
json_dump_file(details,meta.c_str(),JSON_INDENT(4));
json_t* thumbnail = json_object_get(details,"thumbnail");
if(thumbnail == nullptr || !json_is_object(thumbnail))
goto end;
json_t* thumbnails = json_object_get(thumbnail,"thumbnails");
if(thumbnails == nullptr || !json_is_array(thumbnails))
goto end;
size_t index;
json_t* value;
json_array_foreach(thumbnails,index,value)
{
json_t* thumbUrl = json_object_get(value,"url");
if(thumbUrl == nullptr || !json_is_string(thumbUrl)) continue;
json_t* thubWid = json_object_get(value,"width");
if(thubWid == nullptr || !json_is_integer(thubWid)) continue;
json_t* thubHei = json_object_get(value,"height");
if(thubHei == nullptr || !json_is_integer(thubHei)) continue;
auto w=json_integer_value(thubWid);
auto h=json_integer_value(thubHei);
auto u=json_string_value(thumbUrl);
std::string thumbName = std::to_string(w) +"x"+ std::to_string(h) + ".jpg";
std::filesystem::path thumbPath = data_dir / thumbName;
download_file(u,thumbPath);
}
}
}
end:
json_decref(res);
}
int main(int argc,char** argv)
{
curl_global_init(CURL_GLOBAL_ALL);
if(argc == 1)
{
printf("USAGE: %s <YouTube Video Urls or Ids...>\nLICENSED UNDER GPLv3, type --license or goto <https://www.gnu.org/licenses/gpl-3.0.html> for more info\nUses some code from https://github.com/Tyrrrz/YoutubeExplode which whom I don't agree with\n",argv[0]);
}
if(argc == 2 && strcmp(argv[1],"--license") == 0)
{
printf("%s\n",license);
return 0;
}
for(int i = 1;i<argc;i++)
{
VideoId id(argv[i]);
if(id.HasValue())
{
download_video(id);
}
}
curl_global_cleanup();
}