Checks to see if a blob looks like a compressed file.
| public isCompressed ( data $data ) : boolean | ||
| $data | data | The blob data (or just the header). |
| return | boolean | TRUE if the blob looks like a compressed file, FALSE otherwise. |
/**
* Downloads a story.
*
* @param string $media_id
* The media ID of the story.
* @param string $key
* The base64-encoded key of the story.
* @param string $iv
* The base64-encoded IV of the story.
*
* @return mixed
* The story data or FALSE on failure.
*/
public function getStory($media_id, $key, $iv, $from, $timestamp, $save = FALSE, $subdir = null)
{
// Make sure we're logged in and have a valid access token.
if (!$this->auth_token || !$this->username) {
return FALSE;
}
// Build path
if ($save) {
if ($subdir == null) {
$subdir = $this->username;
}
$path = __DIR__ . DIRECTORY_SEPARATOR . "stories" . DIRECTORY_SEPARATOR . $subdir . DIRECTORY_SEPARATOR . $from;
if (!file_exists($path)) {
mkdir($path, 0777, true);
}
$file = $path . DIRECTORY_SEPARATOR . date("Y-m-d H-i-s", (int) ($timestamp / 1000)) . "-story-" . $media_id;
$extensions = array(".jpg", ".png", ".mp4", "");
foreach ($extensions as $ext) {
if (file_exists($file . $ext)) {
return false;
}
}
}
// Retrieve encrypted story and decrypt.
$blob = parent::get('/bq/story_blob?story_id=' . $media_id);
if (!empty($blob)) {
$result = parent::decryptCBC($blob, $key, $iv);
if (parent::isCompressed(substr($result, 0, 2))) {
$result = parent::unCompress($result);
}
if ($save) {
if (is_array($result)) {
foreach ($result as &$value) {
if (!file_exists($file)) {
$this->writeToFile($file, $value);
}
}
} else {
if (!file_exists($file)) {
$this->writeToFile($file, $result);
}
}
}
return $result;
}
return FALSE;
}
/**
* Downloads a story.
*
* @param string $media_id
* The media ID of the story.
* @param string $key
* The base64-encoded key of the story.
* @param string $iv
* The base64-encoded IV of the story.
*
* @return mixed
* The story data or FALSE on failure.
*/
public function getStory($media_id, $key, $iv, $from, $timestamp, $save = FALSE, $subdir = null)
{
// Make sure we're logged in and have a valid access token.
if (!$this->auth_token || !$this->username) {
return FALSE;
}
// Build path
if ($save) {
if ($subdir == null) {
$subdir = $this->username;
}
$path = __DIR__ . DIRECTORY_SEPARATOR . "stories" . DIRECTORY_SEPARATOR . $subdir . DIRECTORY_SEPARATOR . $from;
if (!file_exists($path)) {
mkdir($path, 0777, true);
}
$file = $path . DIRECTORY_SEPARATOR . date("Y-m-d-H-i-s", (int) ($timestamp / 1000)) . "-story-" . $media_id;
$extensions = array(".jpg", ".png", ".mp4", "");
foreach ($extensions as $ext) {
if (file_exists($file . $ext)) {
return false;
}
}
}
// Retrieve encrypted story and decrypt.
$blob = parent::get('/bq/story_blob?story_id=' . $media_id);
if (!empty($blob)) {
$result = parent::decryptCBC($blob, $key, $iv);
if (parent::isCompressed(substr($result, 0, 2))) {
$result = parent::unCompress($result);
}
if ($save) {
if (is_array($result)) {
$files = array();
foreach ($result as &$value) {
if (!file_exists($file)) {
$newFile = $this->writeToFile($file, $value);
if ($newFile) {
$files[] = $newFile;
}
}
}
$output = array();
$returnvalue = false;
exec('ffmpeg -version', $output, $returnvalue);
if ($returnvalue === 0) {
$videoSize = shell_exec("ffprobe -v error -select_streams v:0 -show_entries stream=width,height \\-of default=nokey=1:noprint_wrappers=1 {$files['0']}");
$videoSize = array_filter(explode("\n", $videoSize));
shell_exec("ffmpeg -y -i {$files['1']} -vf scale={$videoSize['0']}:{$videoSize['1']} {$files['1']}");
shell_exec("ffmpeg -y -i {$files['0']} -i {$files['1']} -strict -2 -filter_complex overlay -c:a copy -flags global_header {$files['0']}");
unlink($files[1]);
}
} else {
if (!file_exists($file)) {
$this->writeToFile($file, $result);
}
}
}
return $result;
}
return FALSE;
}
/**
* Downloads a snap.
*
* @param string $id
* The snap ID.
*
* @return mixed
* The snap data or FALSE on failure.
* Snap data can returned as an Array of more than one file.
* array(
* overlay~zip-CE6F660A-4A9F-4BD6-8183-245C9C75B8A0 => overlay_file_data,
* media~zip-CE6F660A-4A9F-4BD6-8183-245C9C75B8A0 => m4v_file_data
* )
*/
public function getMedia($id)
{
// Make sure we're logged in and have a valid access token.
if (!$this->auth_token || !$this->username) {
return FALSE;
}
$timestamp = parent::timestamp();
$result = parent::post('/blob', array('id' => $id, 'timestamp' => $timestamp, 'username' => $this->username), array($this->auth_token, $timestamp));
if (parent::isMedia(substr($result, 0, 2))) {
return $result;
} else {
$result = parent::decryptECB($result);
if (parent::isMedia(substr($result, 0, 2))) {
return $result;
}
//When a snapchat video is sent with "text" or overlay
//the overlay is a transparent PNG file Zipped together
//with the M4V file.
//First two bytes are "PK" x50x4B; thus the previous media check
//will fail and would've returned a FALSE on an available media.
if (parent::isCompressed(substr($result, 0, 2))) {
//Uncompress
$result = parent::unCompress($result);
//Return Media and Overlay
return $result;
}
}
return FALSE;
}