51 lines
1.6 KiB
PHP
51 lines
1.6 KiB
PHP
<?php
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$plugin = array(
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'title' => t("Image/exif"),
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'description' => t('Get a location from an image that was taken with a GPS enabled phone or camera'),
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'callback' => 'geocoder_exif',
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'field_types' => array('file', 'image'),
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'field_callback' => 'geocoder_exif_field',
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);
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function geocoder_exif($url, $options = array()) {
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// Invoke hook_file_download to check permissions
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// We are essentially duplicating the logic found in file.inc file_download()
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foreach (module_implements('file_download') as $module) {
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$function = $module . '_file_download';
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$result = $function($url);
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if ($result == -1) {
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drupal_set_message(t('You do not have permission to access this file'), 'error');
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return FALSE;
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}
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}
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// The user has permission to access the file. Geocode it.
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geophp_load();
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if ($data = exif_read_data($url)) {
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if (!isset($data['GPSLatitudeRef'])) return FALSE;
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$lat = geocoder_exif_from($data['GPSLatitudeRef'], $data['GPSLatitude']);
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$lon = geocoder_exif_from($data['GPSLongitudeRef'], $data['GPSLongitude']);
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$point = new Point($lon, $lat);
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return $point;
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}
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else return FALSE;
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}
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function geocoder_exif_field($field, $field_item) {
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if ($field_item['fid']) {
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$file = file_load($field_item['fid']);
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return geocoder_exif($file->uri);
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}
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}
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function geocoder_exif_from($dir, $data) {
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foreach ($data as $k => $item) {
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list($deg, $pct) = explode('/', $item);
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if ($pct) $data[$k] = $deg / $pct;
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}
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$point = (float) $data[0] + ($data[1] / 60) + ($data[2] / 3600);
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if (in_array($dir, array('S', 'W'))) $point = $point * -1;
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return $point;
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}
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