/**
* Pull EXIF data from image file
*
* @param TidypicsImage $image
*/
function td_get_exif($image)
{
// catch for those who don't have exif module loaded
if (!is_callable('exif_read_data')) {
return;
}
$mime = $image->mimetype;
if ($mime != 'image/jpeg' && $mime != 'image/pjpeg') {
return;
}
$filename = $image->getFilenameOnFilestore();
$exif = exif_read_data($filename, "ANY_TAG", true);
if (is_array($exif)) {
// What data is in the image file?
$data = false;
// We start with no data
if (is_array($exif['IFD0']) && is_array($exif['EXIF'])) {
$data = array_merge($exif['IFD0'], $exif['EXIF']);
} else {
if (is_array($exif['IFD0'])) {
$data = $exif['IFD0'];
} else {
if (is_array($exif['EXIF'])) {
$data = $exif['EXIF'];
}
}
}
if ($data && is_array($data) && count($data) > 0) {
foreach ($data as $key => $value) {
if (is_string($value)) {
// there are sometimes unicode characters that cause problems with serialize
$data[$key] = preg_replace('/[^[:print:]]/', '', $value);
}
}
}
if (is_array($exif['GPS'])) {
// GPS data
$gps_exif = array_intersect_key($exif['GPS'], array_flip(array('GPSLatitudeRef', 'GPSLatitude', 'GPSLongitudeRef', 'GPSLongitude')));
if (count($gps_exif) == 4) {
if (is_array($gps_exif['GPSLatitude']) && in_array($gps_exif['GPSLatitudeRef'], array('S', 'N')) && is_array($gps_exif['GPSLongitude']) && in_array($gps_exif['GPSLongitudeRef'], array('W', 'E'))) {
$data['latitude'] = parse_exif_gps_data($gps_exif['GPSLatitude'], $gps_exif['GPSLatitudeRef']);
$data['longitude'] = parse_exif_gps_data($gps_exif['GPSLongitude'], $gps_exif['GPSLongitudeRef']);
}
}
}
if ($data && is_array($data) && count($data) > 0) {
$image->tp_exif = serialize($data);
}
}
}
/**
* returns informations from EXIF metadata, mapping is done in this function.
*
* @param string $filename
* @param array $map
* @return array
*/
function get_exif_data($filename, $map)
{
global $conf;
$result = array();
if (!function_exists('read_exif_data')) {
die('Exif extension not available, admin should disable exif use');
}
// Read EXIF data
if ($exif = @read_exif_data($filename) or $exif2 = trigger_change('format_exif_data', $exif = null, $filename, $map)) {
if (!empty($exif2)) {
$exif = $exif2;
} else {
$exif = trigger_change('format_exif_data', $exif, $filename, $map);
}
// configured fields
foreach ($map as $key => $field) {
if (strpos($field, ';') === false) {
if (isset($exif[$field])) {
$result[$key] = $exif[$field];
}
} else {
$tokens = explode(';', $field);
if (isset($exif[$tokens[0]][$tokens[1]])) {
$result[$key] = $exif[$tokens[0]][$tokens[1]];
}
}
}
// GPS data
$gps_exif = array_intersect_key($exif, array_flip(array('GPSLatitudeRef', 'GPSLatitude', 'GPSLongitudeRef', 'GPSLongitude')));
if (count($gps_exif) == 4) {
if (is_array($gps_exif['GPSLatitude']) and in_array($gps_exif['GPSLatitudeRef'], array('S', 'N')) and is_array($gps_exif['GPSLongitude']) and in_array($gps_exif['GPSLongitudeRef'], array('W', 'E'))) {
$result['latitude'] = parse_exif_gps_data($gps_exif['GPSLatitude'], $gps_exif['GPSLatitudeRef']);
$result['longitude'] = parse_exif_gps_data($gps_exif['GPSLongitude'], $gps_exif['GPSLongitudeRef']);
}
}
}
if (!$conf['allow_html_in_metadata']) {
foreach ($result as $key => $value) {
// in case the origin of the photo is unsecure (user upload), we remove
// HTML tags to avoid XSS (malicious execution of javascript)
$result[$key] = strip_tags($value);
}
}
return $result;
}
