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Video_Stream.php
252 lines
| 1 | <?php |
| 2 | /** |
| 3 | * Video Stream |
| 4 | * |
| 5 | * @package Tutor\VideoStream |
| 6 | * @author Themeum <support@themeum.com> |
| 7 | * @link https://themeum.com |
| 8 | * @since 1.0.0 |
| 9 | */ |
| 10 | |
| 11 | namespace TUTOR; |
| 12 | |
| 13 | if ( ! defined( 'ABSPATH' ) ) { |
| 14 | exit; |
| 15 | } |
| 16 | |
| 17 | |
| 18 | /** |
| 19 | * Class Video_Stream |
| 20 | * |
| 21 | * @since 1.0.0 |
| 22 | */ |
| 23 | class Video_Stream { |
| 24 | |
| 25 | /** |
| 26 | * Path |
| 27 | * |
| 28 | * @since 1.0.0 |
| 29 | * |
| 30 | * @var string |
| 31 | */ |
| 32 | private $path = ''; |
| 33 | |
| 34 | /** |
| 35 | * Stream |
| 36 | * |
| 37 | * @since 1.0.0 |
| 38 | * |
| 39 | * @var string |
| 40 | */ |
| 41 | private $stream = ''; |
| 42 | |
| 43 | /** |
| 44 | * Buffer time |
| 45 | * |
| 46 | * @since 1.0.0 |
| 47 | * |
| 48 | * @var string |
| 49 | */ |
| 50 | private $buffer = 102400; |
| 51 | |
| 52 | /** |
| 53 | * Start |
| 54 | * |
| 55 | * @since 1.0.0 |
| 56 | * |
| 57 | * @var int |
| 58 | */ |
| 59 | private $start = -1; |
| 60 | |
| 61 | /** |
| 62 | * End |
| 63 | * |
| 64 | * @since 1.0.0 |
| 65 | * |
| 66 | * @var int |
| 67 | */ |
| 68 | private $end = -1; |
| 69 | |
| 70 | /** |
| 71 | * Size |
| 72 | * |
| 73 | * @since 1.0.0 |
| 74 | * |
| 75 | * @var int |
| 76 | */ |
| 77 | private $size = 0; |
| 78 | |
| 79 | /** |
| 80 | * Video format |
| 81 | * |
| 82 | * @since 1.0.0 |
| 83 | * |
| 84 | * @var string |
| 85 | */ |
| 86 | private $video_format; |
| 87 | |
| 88 | /** |
| 89 | * Resolve dependencies |
| 90 | * |
| 91 | * @since 1.0.0 |
| 92 | * |
| 93 | * @param string $file_path file path. |
| 94 | */ |
| 95 | public function __construct( $file_path ) { |
| 96 | $this->video_format = apply_filters( |
| 97 | 'tutor_video_types', |
| 98 | array( |
| 99 | 'mp4' => 'video/mp4', |
| 100 | 'webm' => 'video/webm', |
| 101 | 'ogg' => 'video/ogg', |
| 102 | ) |
| 103 | ); |
| 104 | $this->path = $file_path; |
| 105 | } |
| 106 | |
| 107 | /** |
| 108 | * Whether the file is a real video inside the uploads directory. |
| 109 | * |
| 110 | * @since 4.0.2 |
| 111 | * |
| 112 | * @param string $file_path file path. |
| 113 | * |
| 114 | * @return bool |
| 115 | */ |
| 116 | private function is_allowed_path( $file_path ) { |
| 117 | $real_file = $file_path ? realpath( $file_path ) : false; |
| 118 | if ( ! $real_file || ! is_file( $real_file ) ) { |
| 119 | return false; |
| 120 | } |
| 121 | |
| 122 | $uploads = wp_get_upload_dir(); |
| 123 | $real_uploads = ! empty( $uploads['basedir'] ) ? realpath( $uploads['basedir'] ) : false; |
| 124 | if ( ! $real_uploads ) { |
| 125 | return false; |
| 126 | } |
| 127 | |
| 128 | $real_file = wp_normalize_path( $real_file ); |
| 129 | $real_uploads = trailingslashit( wp_normalize_path( $real_uploads ) ); |
| 130 | $is_allowed = 0 === strpos( $real_file, $real_uploads ); |
| 131 | |
| 132 | return (bool) apply_filters( 'tutor_video_stream_is_allowed_path', $is_allowed, $real_file ); |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | * Open stream |
| 137 | * |
| 138 | * @since 1.0.0 |
| 139 | * |
| 140 | * @return void |
| 141 | */ |
| 142 | private function open() { |
| 143 | $this->stream = fopen( $this->path, 'rb' ); |
| 144 | if ( ! ( $this->stream ) ) { |
| 145 | die( 'Could not open stream for reading' ); |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | /** |
| 150 | * Set proper header to serve the video content |
| 151 | * |
| 152 | * @since 1.0.0 |
| 153 | * |
| 154 | * @return void |
| 155 | */ |
| 156 | private function set_header() { |
| 157 | ob_get_clean(); |
| 158 | |
| 159 | header( 'Content-Type: ' . $this->video_format[ strtolower( pathinfo( $this->path, PATHINFO_EXTENSION ) ) ] ); |
| 160 | header( 'Cache-Control: max-age=2592000, public' ); |
| 161 | header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', tutor_time() + 2592000 ) . ' GMT' ); |
| 162 | header( 'Last-Modified: ' . gmdate( 'D, d M Y H:i:s', @filemtime( $this->path ) ) . ' GMT' ); |
| 163 | $this->start = 0; |
| 164 | $this->size = filesize( $this->path ); |
| 165 | $this->end = $this->size - 1; |
| 166 | header( 'Accept-Ranges: 0-' . $this->end ); |
| 167 | |
| 168 | if ( isset( $_SERVER['HTTP_RANGE'] ) ) { |
| 169 | $c_end = $this->end; |
| 170 | list(, $range) = explode( '=', sanitize_text_field( wp_unslash( $_SERVER['HTTP_RANGE'] ) ), 2 ); |
| 171 | |
| 172 | if ( '-' == $range ) { |
| 173 | $c_start = $this->size - substr( $range, 1 ); |
| 174 | } else { |
| 175 | $range = explode( '-', $range ); |
| 176 | $c_start = $range[0]; |
| 177 | |
| 178 | $c_end = ( isset( $range[1] ) && is_numeric( $range[1] ) ) ? $range[1] : $c_end; |
| 179 | } |
| 180 | $c_end = ( $c_end > $this->end ) ? $this->end : $c_end; |
| 181 | if ( $c_start > $c_end || $c_start > $this->size - 1 || $c_end >= $this->size ) { |
| 182 | header( 'HTTP/1.1 416 Requested Range Not Satisfiable' ); |
| 183 | header( "Content-Range: bytes $this->start-$this->end/$this->size" ); |
| 184 | exit; |
| 185 | } |
| 186 | $this->start = $c_start; |
| 187 | $this->end = $c_end; |
| 188 | $length = $this->end - $this->start + 1; |
| 189 | header( 'HTTP/1.1 206 Partial Content' ); |
| 190 | header( 'Content-Length: ' . $length ); |
| 191 | header( "Content-Range: bytes $this->start-$this->end/" . $this->size ); |
| 192 | header( 'Accept-Ranges: bytes' ); |
| 193 | } else { |
| 194 | header( 'Content-Length: ' . $this->size ); |
| 195 | } |
| 196 | |
| 197 | } |
| 198 | |
| 199 | /** |
| 200 | * Close currently opened stream |
| 201 | * |
| 202 | * @since 1.0.0 |
| 203 | * |
| 204 | * @return void |
| 205 | */ |
| 206 | private function end() { |
| 207 | fclose( $this->stream ); |
| 208 | exit; |
| 209 | } |
| 210 | |
| 211 | /** |
| 212 | * Perform the streaming of calculated range |
| 213 | * |
| 214 | * @since 1.0.0 |
| 215 | * |
| 216 | * @return void |
| 217 | */ |
| 218 | private function stream() { |
| 219 | $i = $this->start; |
| 220 | set_time_limit( 0 ); |
| 221 | while ( ! feof( $this->stream ) && $i <= $this->end ) { |
| 222 | $bytes_to_read = $this->buffer; |
| 223 | if ( ( $i + $bytes_to_read ) > $this->end ) { |
| 224 | $bytes_to_read = $this->end - $i + 1; |
| 225 | } |
| 226 | $data = @stream_get_contents( $this->stream, $bytes_to_read, $i ); |
| 227 | echo wp_kses_post( $data ); |
| 228 | flush(); |
| 229 | $i += $bytes_to_read; |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | /** |
| 234 | * Start streaming tutor video content |
| 235 | * |
| 236 | * @since 1.0.0 |
| 237 | * |
| 238 | * @return void |
| 239 | */ |
| 240 | public function start() { |
| 241 | if ( ! $this->is_allowed_path( $this->path ) ) { |
| 242 | status_header( 403 ); |
| 243 | exit; |
| 244 | } |
| 245 | |
| 246 | $this->open(); |
| 247 | $this->set_header(); |
| 248 | $this->stream(); |
| 249 | $this->end(); |
| 250 | } |
| 251 | } |
| 252 |