memories/lib/Exif.php

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<?php
declare(strict_types=1);
namespace OCA\Memories;
use OCA\Memories\AppInfo\Application;
use OCP\Files\File;
use OCP\IConfig;
class Exif {
/** Opened instance of exiftool when running in command mode */
private static $staticProc = null;
private static $staticPipes = null;
private static $noStaticProc = false;
/** Initialize static exiftool process for local reads */
private static function initializeStaticExiftoolProc() {
self::closeStaticExiftoolProc();
self::$staticProc = proc_open(['exiftool', '-stay_open', 'true', '-@', '-'], [
0 => array('pipe', 'r'),
1 => array('pipe', 'w'),
2 => array('pipe', 'w'),
], self::$staticPipes);
}
public static function closeStaticExiftoolProc() {
try {
if (self::$staticProc) {
fclose(self::$staticPipes[0]);
fclose(self::$staticPipes[1]);
fclose(self::$staticPipes[2]);
proc_terminate(self::$staticProc);
}
} catch (\Exception $ex) {}
}
public static function ensureStaticExiftoolProc() {
if (self::$noStaticProc) {
return;
}
if (!self::$staticProc) {
self::initializeStaticExiftoolProc();
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usleep(500000); // wait if error
if (!proc_get_status(self::$staticProc)["running"]) {
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error_log("WARN: Failed to create stay_open exiftool process");
self::$noStaticProc = true;
self::$staticProc = null;
}
return;
}
if (!proc_get_status(self::$staticProc)["running"]) {
self::$staticProc = null;
self::ensureStaticExiftoolProc();
}
}
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/**
* Get the path to the user's configured photos directory.
* @param IConfig $config
* @param string $userId
*/
public static function getPhotosPath(IConfig &$config, string &$userId) {
$p = $config->getUserValue($userId, Application::APPNAME, 'timelinePath', '');
if (empty($p)) {
return '/Photos/';
}
return $p;
}
/**
* Get exif data as a JSON object from a Nextcloud file.
* @param File $file
*/
public static function getExifFromFile(File &$file) {
// Borrowed from previews
// https://github.com/nextcloud/server/blob/19f68b3011a3c040899fb84975a28bd746bddb4b/lib/private/Preview/ProviderV2.php
if (!$file->isEncrypted() && $file->getStorage()->isLocal()) {
$path = $file->getStorage()->getLocalFile($file->getInternalPath());
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if (is_string($path)) {
return self::getExifFromLocalPath($path);
}
}
// Fallback to reading as a stream
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$handle = $file->fopen('rb');
if (!$handle) {
throw new \Exception('Could not open file');
}
$exif = self::getExifFromStream($handle);
fclose($handle);
return $exif;
}
/** Get exif data as a JSON object from a local file path */
public static function getExifFromLocalPath(string &$path) {
if (!is_null(self::$staticProc)) {
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self::ensureStaticExiftoolProc();
return self::getExifFromLocalPathWithStaticProc($path);
} else {
return self::getExifFromLocalPathWithSeparateProc($path);
}
}
private static function getExifFromLocalPathWithStaticProc(string &$path) {
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fwrite(self::$staticPipes[0], "$path\n-json\n-api\nQuickTimeUTC=1\n-execute\n");
fflush(self::$staticPipes[0]);
$buf = "";
$readyToken = "\n{ready}\n";
while (!str_ends_with($buf, $readyToken)) {
$r = fread(self::$staticPipes[1], 1);
if ($r === false) {
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error_log("PANIC: Something went wrong with static exiftool process");
exit(1);
}
$buf .= $r;
}
$buf = substr($buf, 0, strrpos($buf, $readyToken));
return self::processStdout($buf);
}
private static function getExifFromLocalPathWithSeparateProc(string &$path) {
$pipes = [];
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$proc = proc_open(['exiftool', '-api', 'QuickTimeUTC=1', '-json', $path], [
1 => array('pipe', 'w'),
2 => array('pipe', 'w'),
], $pipes);
$stdout = stream_get_contents($pipes[1]);
// Clean up
fclose($pipes[1]);
fclose($pipes[2]);
proc_close($proc);
return self::processStdout($stdout);
}
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/**
* Get exif data as a JSON object from a stream.
* @param resource $handle
*/
public static function getExifFromStream(&$handle) {
// Start exiftool and output to json
$pipes = [];
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$proc = proc_open(['exiftool', '-api', 'QuickTimeUTC=1', '-json', '-fast', '-'], [
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0 => array('pipe', 'rb'),
1 => array('pipe', 'w'),
2 => array('pipe', 'w'),
], $pipes);
// Write the file to exiftool's stdin
// Warning: this is slow for big files
stream_copy_to_stream($handle, $pipes[0]);
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fclose($pipes[0]);
// Get output from exiftool
$stdout = stream_get_contents($pipes[1]);
// Clean up
fclose($pipes[1]);
fclose($pipes[2]);
proc_close($proc);
return self::processStdout($stdout);
}
/** Get json array from stdout of exiftool */
private static function processStdout(string &$stdout) {
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$json = json_decode($stdout, true);
if (!$json) {
throw new \Exception('Could not read exif data');
}
return $json[0];
}
/**
* Get the date taken from either the file or exif data if available.
* @param File $file
* @param array $exif
*/
public static function getDateTaken(File &$file, array &$exif) {
$dt = $exif['DateTimeOriginal'];
if (!isset($dt) || empty($dt)) {
$dt = $exif['CreateDate'];
}
// Check if found something
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if (isset($dt) && is_string($dt) && !empty($dt)) {
$dt = explode('-', explode('+', $dt, 2)[0], 2)[0]; // get rid of timezone if present
$dt = \DateTime::createFromFormat('Y:m:d H:i:s', $dt, new \DateTimeZone("UTC"));
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if ($dt && $dt->getTimestamp() > -5364662400) { // 1800 A.D.
return $dt->getTimestamp();
}
}
// Fall back to creation time
$dateTaken = $file->getCreationTime();
// Fall back to modification time
if ($dateTaken == 0) {
$dateTaken = $file->getMtime();
}
return $dateTaken;
}
}