1 files changed, 245 insertions, 0 deletions
diff --git a/www/wiki/includes/media/ExifBitmap.php b/www/wiki/includes/media/ExifBitmap.php
new file mode 100644
index 00000000..42672109
--- /dev/null
+++ b/www/wiki/includes/media/ExifBitmap.php
@@ -0,0 +1,245 @@
+<?php
+/**
+ * Handler for bitmap images with exif metadata.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @ingroup Media
+ */
+
+/**
+ * Stuff specific to JPEG and (built-in) TIFF handler.
+ * All metadata related, since both JPEG and TIFF support Exif.
+ *
+ * @ingroup Media
+ */
+class ExifBitmapHandler extends BitmapHandler {
+	const BROKEN_FILE = '-1'; // error extracting metadata
+	const OLD_BROKEN_FILE = '0'; // outdated error extracting metadata.
+
+	function convertMetadataVersion( $metadata, $version = 1 ) {
+		// basically flattens arrays.
+		$version = intval( explode( ';', $version, 2 )[0] );
+		if ( $version < 1 || $version >= 2 ) {
+			return $metadata;
+		}
+
+		$avoidHtml = true;
+
+		if ( !is_array( $metadata ) ) {
+			$metadata = unserialize( $metadata );
+		}
+		if ( !isset( $metadata['MEDIAWIKI_EXIF_VERSION'] ) || $metadata['MEDIAWIKI_EXIF_VERSION'] != 2 ) {
+			return $metadata;
+		}
+
+		// Treat Software as a special case because in can contain
+		// an array of (SoftwareName, Version).
+		if ( isset( $metadata['Software'] )
+			&& is_array( $metadata['Software'] )
+			&& is_array( $metadata['Software'][0] )
+			&& isset( $metadata['Software'][0][0] )
+			&& isset( $metadata['Software'][0][1] )
+		) {
+			$metadata['Software'] = $metadata['Software'][0][0] . ' (Version '
+				. $metadata['Software'][0][1] . ')';
+		}
+
+		$formatter = new FormatMetadata;
+
+		// ContactInfo also has to be dealt with specially
+		if ( isset( $metadata['Contact'] ) ) {
+			$metadata['Contact'] =
+				$formatter->collapseContactInfo(
+					$metadata['Contact'] );
+		}
+
+		foreach ( $metadata as &$val ) {
+			if ( is_array( $val ) ) {
+				$val = $formatter->flattenArrayReal( $val, 'ul', $avoidHtml );
+			}
+		}
+		$metadata['MEDIAWIKI_EXIF_VERSION'] = 1;
+
+		return $metadata;
+	}
+
+	/**
+	 * @param File $image
+	 * @param array $metadata
+	 * @return bool|int
+	 */
+	function isMetadataValid( $image, $metadata ) {
+		global $wgShowEXIF;
+		if ( !$wgShowEXIF ) {
+			# Metadata disabled and so an empty field is expected
+			return self::METADATA_GOOD;
+		}
+		if ( $metadata === self::OLD_BROKEN_FILE ) {
+			# Old special value indicating that there is no Exif data in the file.
+			# or that there was an error well extracting the metadata.
+			wfDebug( __METHOD__ . ": back-compat version\n" );
+
+			return self::METADATA_COMPATIBLE;
+		}
+		if ( $metadata === self::BROKEN_FILE ) {
+			return self::METADATA_GOOD;
+		}
+		Wikimedia\suppressWarnings();
+		$exif = unserialize( $metadata );
+		Wikimedia\restoreWarnings();
+		if ( !isset( $exif['MEDIAWIKI_EXIF_VERSION'] )
+			|| $exif['MEDIAWIKI_EXIF_VERSION'] != Exif::version()
+		) {
+			if ( isset( $exif['MEDIAWIKI_EXIF_VERSION'] )
+				&& $exif['MEDIAWIKI_EXIF_VERSION'] == 1
+			) {
+				// back-compatible but old
+				wfDebug( __METHOD__ . ": back-compat version\n" );
+
+				return self::METADATA_COMPATIBLE;
+			}
+			# Wrong (non-compatible) version
+			wfDebug( __METHOD__ . ": wrong version\n" );
+
+			return self::METADATA_BAD;
+		}
+
+		return self::METADATA_GOOD;
+	}
+
+	/**
+	 * @param File $image
+	 * @param bool|IContextSource $context Context to use (optional)
+	 * @return array|bool
+	 */
+	function formatMetadata( $image, $context = false ) {
+		$meta = $this->getCommonMetaArray( $image );
+		if ( count( $meta ) === 0 ) {
+			return false;
+		}
+
+		return $this->formatMetadataHelper( $meta, $context );
+	}
+
+	public function getCommonMetaArray( File $file ) {
+		$metadata = $file->getMetadata();
+		if ( $metadata === self::OLD_BROKEN_FILE
+			|| $metadata === self::BROKEN_FILE
+			|| $this->isMetadataValid( $file, $metadata ) === self::METADATA_BAD
+		) {
+			// So we don't try and display metadata from PagedTiffHandler
+			// for example when using InstantCommons.
+			return [];
+		}
+
+		$exif = unserialize( $metadata );
+		if ( !$exif ) {
+			return [];
+		}
+		unset( $exif['MEDIAWIKI_EXIF_VERSION'] );
+
+		return $exif;
+	}
+
+	function getMetadataType( $image ) {
+		return 'exif';
+	}
+
+	/**
+	 * Wrapper for base classes ImageHandler::getImageSize() that checks for
+	 * rotation reported from metadata and swaps the sizes to match.
+	 *
+	 * @param File|FSFile $image
+	 * @param string $path
+	 * @return array
+	 */
+	function getImageSize( $image, $path ) {
+		$gis = parent::getImageSize( $image, $path );
+
+		// Don't just call $image->getMetadata(); FSFile::getPropsFromPath() calls us with a bogus object.
+		// This may mean we read EXIF data twice on initial upload.
+		if ( $this->autoRotateEnabled() ) {
+			$meta = $this->getMetadata( $image, $path );
+			$rotation = $this->getRotationForExif( $meta );
+		} else {
+			$rotation = 0;
+		}
+
+		if ( $rotation == 90 || $rotation == 270 ) {
+			$width = $gis[0];
+			$gis[0] = $gis[1];
+			$gis[1] = $width;
+		}
+
+		return $gis;
+	}
+
+	/**
+	 * On supporting image formats, try to read out the low-level orientation
+	 * of the file and return the angle that the file needs to be rotated to
+	 * be viewed.
+	 *
+	 * This information is only useful when manipulating the original file;
+	 * the width and height we normally work with is logical, and will match
+	 * any produced output views.
+	 *
+	 * @param File $file
+	 * @return int 0, 90, 180 or 270
+	 */
+	public function getRotation( $file ) {
+		if ( !$this->autoRotateEnabled() ) {
+			return 0;
+		}
+
+		$data = $file->getMetadata();
+
+		return $this->getRotationForExif( $data );
+	}
+
+	/**
+	 * Given a chunk of serialized Exif metadata, return the orientation as
+	 * degrees of rotation.
+	 *
+	 * @param string $data
+	 * @return int 0, 90, 180 or 270
+	 * @todo FIXME: Orientation can include flipping as well; see if this is an issue!
+	 */
+	protected function getRotationForExif( $data ) {
+		if ( !$data ) {
+			return 0;
+		}
+		Wikimedia\suppressWarnings();
+		$data = unserialize( $data );
+		Wikimedia\restoreWarnings();
+		if ( isset( $data['Orientation'] ) ) {
+			# See http://sylvana.net/jpegcrop/exif_orientation.html
+			switch ( $data['Orientation'] ) {
+				case 8:
+					return 90;
+				case 3:
+					return 180;
+				case 6:
+					return 270;
+				default:
+					return 0;
+			}
+		}
+
+		return 0;
+	}
+}