YTBack

<?php
    /*
    YTB - YouTube Backup V0.01 Beta - 29 aug 2016

    This script was made by Enrico Ronconi <enrico.ronconi.p@gmail.com>
    in aug 2016 for educational purposes only,
    it comes with absolutely NO WARRANTY ;)

    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.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
    */

    /*
    No MySQL db required, instead this script saves a sort of db in json format,
    the array structure associated with a video is
            $array      [video-id]  -> video id
                        [title]     -> Title
                        [date]      -> Upload date
                        [desc]      -> Description
    */


    //Settings - API
    $API_key = "zeb89";
    $API_channel_id = "UCq5p-pTnsbjMX3k2A2RuYRw";
    $API_other_opts = "&part=snippet,id&order=date&maxResults=50";      //don't touch this
    $API_url_start = "https://www.googleapis.com/youtube/v3/search";    //don't touch this - remember that ssl/https is required

    //Settings - Other
    $db_file = 'YTB.dat';
    $log_file = 'YTB.log';
    $fold = "/large/YTB";                                               //destination folder
    $verbose = FALSE;
    $log_success = FALSE;                                               //If true logs event if there is no new video an there is no errors

    function new_videos($saved_db,$api_response) {                      //compares the api response with saved db to see what's new
        $videos = $api_response['items'];
        $existing = array();
        foreach ($saved_db as $ex){
            array_push($existing,$ex['id']);
        }
        $new_vids = array();
        foreach ($videos as $video){
            if ($video['id']['kind'] == 'youtube#video') {  //analyze only the videos
                if(in_array($video['id']['videoId'],$existing) == FALSE){
                    unset($new_vids_tmp);
                    $new_vids_tmp['id']     = $video['id']['videoId'];
                    $new_vids_tmp['title']  = $video['snippet']['title'];
                    $new_vids_tmp['date']   = $video['snippet']['publishedAt'];
                    $new_vids_tmp['desc']   = $video['snippet']['description'];
                    array_push($new_vids,$new_vids_tmp);
                }
            }
        }
        return $new_vids;
    }

    function say($text,$printdate=TRUE) {
        global $verbose,$log_handle;
        if($printdate) $text = date('c').' :: '.$text;
        if ($verbose) echo $text;
        fwrite($log_handle,$text);
    }

    function save_video($id) {
        $id = preg_replace("/[^A-Za-z0-9 _-]/", '', $id);               //just to be safe. I don't want that someone somehow let me get an id like '; rm -rf /*' LEL
        say("Downloading https://www.youtube.com/watch?v=$id...");
        exec("timeout -k 1 10m youtube-dl --no-warnings -f bestvideo+bestaudio \"https://www.youtube.com/watch?v=$id\"",$dummy,$resp);
        say(" Done! Exit status: $resp\n",FALSE);
        return $resp;
    }

    function clean_quit($status) {
        global $log_handle,$lock;
        if($lock) fclose($lock);
        if($log_handle) fclose($log_handle);
        exit($status);
    }

    //MAIN

    $log_handle = fopen($log_file,'a+');
    if($log_handle == FALSE) {
        die("Impossibile aprire il file di log!");
    }

    $lock = fopen('/tmp/YTB.lock', 'w+');
    if ((!flock($lock, LOCK_EX | LOCK_NB)) OR ($lock == false)) {
        say("\n",FALSE);
        say("Another instance! Terminating... \n");
        exit(98);
    }
    if($log_success) say("\n",FALSE);

    if($log_success) say("Reading db...");
    if(file_exists($db_file) == FALSE) {
        file_put_contents($db_file,json_encode(array()));
    }
    $saved_db = @file_get_contents($db_file);
    if ($saved_db === FALSE) {
        say(" Unable to read the database file! Terminating...\n");
        clean_quit(1);
    }
    $saved_db = json_decode($saved_db, $assoc = TRUE);
    if($log_success) say(" Done!\n",FALSE);

    if($log_success) say("Retriving video list... ");
    $API_resp = @file_get_contents("$API_url_start?key=$API_key&channelId=$API_channel_id$API_other_opts");
    if ($API_resp == FALSE) {
        say(" Unable to connect to YT! Terminating...\n");
        clean_quit(2);
    }
    $API_resp = json_decode($API_resp, $assoc = TRUE);
    if (array_key_exists("error",$API_resp)){
        say(" YouTube returned error! Terminating...\n");
        clean_quit(3);
    }
    if($log_success) say(" Done!\n",FALSE);

    $new_vids = new_videos($saved_db,$API_resp);

    if (count($new_vids) == 0) {
        if($log_success) say("DB is up to date! Bye ;)\n");
        clean_quit(0);
    }

    if(!$log_success) say("\n",FALSE);
    say("New video(s) found!\n");
    $old_d = getcwd();
    chdir($fold);
    foreach ($new_vids as $vid){
        $r = save_video($vid['id']);
        if($r == 0) array_push($saved_db, $vid);
    }
    chdir($old_d);

    say("Saving db... ");
    $saved_db = json_encode($saved_db);
    $r = @file_put_contents($db_file,$saved_db);
    if($r === FALSE) {
        say("Error writing file! :(\n",FALSE);
        clean_quit(4);
    }

    say("All Done! ;)\n",FALSE);
    say("Terminating...\n");
    clean_quit(0);
?>