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<?php |
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namespace App\Utils; |
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use PHPExif\Exif; |
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/** |
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* Wrapper for PHPExif's Exif class, which is a little annoying and |
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* also has incorrect PHPDoc in a couple of places. Basically translates |
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* all calls we use to return exactly the type we need, or null, to |
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* make it nice and compatible with our existing code. |
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*/ |
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class ExifHelper implements ExifHelperInterface |
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{ |
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/** @var Exif */ |
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private $exif; |
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public function __construct(Exif $exif) |
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{ |
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$this->exif = $exif; |
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} |
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public function getTitle():?string |
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{ |
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$title = $this->exif->getTitle(); |
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if ($title === false) { |
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return null; |
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} |
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// I cast to string to work around a weird bug in |
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// what looks like exiftool, where PHPExif's use |
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// of it uses its JSON output, and exiftool's |
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// JSON returns titles that look like numbers |
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// (e.g. "42") as integer (i.e. unquoted 42 in the |
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// JSON.) |
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return (string) $title; |
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} |
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public function getDescription():?string |
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{ |
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$description = $this->exif->getCaption(); |
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if ($description === false) { |
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return null; |
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} |
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return (string) $description; |
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} |
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public function getGPS():?array |
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{ |
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$gps = []; // Match the default in our Image entity |
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$gps_as_string = $this->exif->getGPS(); |
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if (is_string($gps_as_string)) { |
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$gps = array_map('doubleval', explode(',', $gps_as_string)); |
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} |
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return $gps; |
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} |
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public function getKeywords():?array |
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{ |
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$keywords = $this->exif->getKeywords(); |
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if (is_string($keywords)) { |
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// A single keyword comes back as a simple string, not an array. We |
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// always return an array. |
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$keywords = [ $keywords ]; |
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} |
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if (is_array($keywords)) { |
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return $keywords; |
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} |
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return []; // Match the default in our Image entity |
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} |
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public function getCreationDate():?\DateTime |
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{ |
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$creationDate = $this->exif->getCreationDate(); |
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if ($creationDate instanceof \DateTime) { |
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// PHPExif assumes that the camera time string is UTC. It's not for many |
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// people's cameras, including mine. Re-interpret it as local time in |
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// Bristol. Not much of a bodge given that this project is specifically |
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// limited to a small geographical region! |
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$converted = new \DateTime($creationDate->format("Y-m-d\TH:i:s"), new \DateTimeZone("Europe/London")); |
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$converted->setTimezone(new \DateTimeZone("UTC")); |
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return $converted; |
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} |
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return null; |
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} |
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public function getRating():?int |
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{ |
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$raw = $this->exif->getRawData(); |
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if (array_key_exists('XMP-xmp:Rating', $raw)) { |
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$rating = $raw['XMP-xmp:Rating']; |
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if (is_int($rating)) { |
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return $rating; |
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} |
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} |
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return null; |
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} |
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public function getLocation(): ?string |
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{ |
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$raw = $this->exif->getRawData(); |
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if (array_key_exists('IPTC:Sub-location', $raw)) { |
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$location = $raw['IPTC:Sub-location']; |
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if (is_string($location)) { |
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return $location; |
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} |
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} |
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return null; |
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} |
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} |
gothick /
omm
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