Ticket #53668: 53668.2.diff

src/wp-includes/class-wp-image-editor.php

@@ -591 +591 @@
          * @return string|false
          */
         protected static function get_extension( $mime_type = null ) {
-                $extensions = explode( '|', array_search( $mime_type, wp_get_mime_types(), true ) );
-
-                if ( empty( $extensions[0] ) ) {
-                        return false;
-                }
-
-                return $extensions[0];
+                return wp_default_extension_for_mime_type( $mime_type );
         }
 }
 

src/wp-includes/functions.php

@@ -2595 +2595 @@
                                 }
                         }
                 }
+
+                // If a different file type might be produced for an image, check filename uniqueness for that format.
+                $filename = _wp_check_alternate_output_format_uniqueness( $filename, $ext, $dir );
         }
 
         /**
@@ -2645 +2648 @@
 }
 
 /**
+ * Helper function for wp_unique_filename to check potential alternate output formats for images.
+ *
+ * @since 5.8.1
+ * @private
+ *
+ * @param string $filename
+ * @param string $ext
+ * @param string $dir
+ *
+ * @return string
+ */
+function _wp_check_alternate_output_format_uniqueness( $filename, $ext, $dir ) {
+        static $checking_alternates;
+
+        if ( empty( $checking_alternates ) ) {
+                $checking_alternates = true;
+                $file_type           = wp_check_filetype_and_ext( trailingslashit( $dir ) . $filename, $filename );
+                $mime_type           = $file_type['type'];
+
+                if ( ! empty( $mime_type ) && 0 === strpos( $mime_type, 'image/' ) ) {
+                        $output_formats = apply_filters( 'image_editor_output_format', array(), trailingslashit( $dir ) . $filename, $mime_type );
+
+                        if (
+                                ! empty( $output_formats ) &&
+                                is_array( $output_formats ) &&
+                                ( ! empty( $output_formats[ $mime_type ] ) || in_array( $mime_type, $output_formats ) )
+                        ) {
+                                $alt_mime_types = array();
+
+                                foreach ( $output_formats as $source => $target ) {
+                                        if ( $source === $mime_type && $target === $mime_type ) {
+                                                continue;
+                                        } elseif ( $source === $mime_type ) {
+                                                $alt_mime_types[] = $target;
+                                        } elseif ( $target === $mime_type ) {
+                                                $alt_mime_types[] = $source;
+                                        }
+                                }
+
+                                $alt_mime_types = array_unique( $alt_mime_types );
+
+                                foreach ( $alt_mime_types as $alt_mime_type ) {
+                                        $alt_ext = wp_default_extension_for_mime_type( $alt_mime_type );
+
+                                        if ( ! empty( $alt_ext ) && ".{$alt_ext}" !== $ext ) {
+                                                $alt_filename  = wp_basename( $filename, $ext ) . ".{$alt_ext}";
+                                                $alt_filename2 = wp_unique_filename( $dir, $alt_filename );
+
+                                                // If a potential clash was found for alternate format, use its unique filename.
+                                                if ( $alt_filename2 !== $alt_filename ) {
+                                                        $filename = wp_basename( $alt_filename2, ".{$alt_ext}" ) . $ext;
+                                                }
+                                        }
+                                }
+                        }
+                }
+                $checking_alternates = false;
+        }
+
+        return $filename;
+}
+
+/**
  * Create a file in the upload folder with given content.
  *
  * If there is an error, then the key 'error' will exist with the error message.
@@ -3042 +3108 @@
 }
 
 /**
+ * Returns first matched extension from Mime-type,
+ * as mapped from wp_get_mime_types()
+ *
+ * @since 5.8.1
+ *
+ * @param string $mime_type
+ *
+ * @return string|false
+ */
+function wp_default_extension_for_mime_type( $mime_type = null ) {
+        $extensions = explode( '|', array_search( $mime_type, wp_get_mime_types(), true ) );
+
+        if ( empty( $extensions[0] ) ) {
+                return false;
+        }
+
+        return $extensions[0];
+}
+
+/**
  * Returns the real mime type of an image file.
  *
  * This depends on exif_imagetype() or getimagesize() to determine real mime types.

tests/phpunit/tests/functions.php

@@ -222 +222 @@
         }
 
         /**
+         * @ticket 53668
+         */
+        function test__wp_check_alternate_output_format_uniqueness() {
+                $testdir = DIR_TESTDATA . '/images/';
+
+                add_filter( 'upload_dir', array( $this, 'upload_dir_patch_basedir' ) );
+
+                // Standard test that wp_unique_filename allows usage if file does not exist yet.
+                $this->assertSame( 'abcdef.png', wp_unique_filename( $testdir, 'abcdef.png' ), 'non-existent file should not have name changed' );
+                // Difference in extension does not affect wp_unique_filename by default (canola.jpg exists).
+                $this->assertSame( 'canola.png', wp_unique_filename( $testdir, 'canola.png' ), 'clashing base filename but not extension should not have name changed' );
+                // Run again to prove no memory.
+                $this->assertSame( 'canola.png', wp_unique_filename( $testdir, 'canola.png' ), 'clashing base filename but not extension should not have name changed' );
+                // Actual clash recognized.
+                $this->assertSame( 'canola-1.jpg', wp_unique_filename( $testdir, 'canola.jpg' ), 'existing file should have name changed' );
+
+                // Now output jpg thumbnails for png files.
+                add_filter( 'image_editor_output_format', array( $this, 'image_editor_output_format_handler' ) );
+
+                // Standard test that wp_unique_filename allows usage if file does not exist yet.
+                $this->assertSame( 'abcdef.png', wp_unique_filename( $testdir, 'abcdef.png' ), 'non-existent file should not have name changed' );
+                // Difference in extension does affect wp_unique_filename when thumbnails use existing file's type.
+                $this->assertSame( 'canola-1.png', wp_unique_filename( $testdir, 'canola.png' ), 'clashing base filename but not extension should have name changed when thumbnails use existing file\'s type' );
+                // Run again to prove no memory.
+                $this->assertSame( 'canola-1.png', wp_unique_filename( $testdir, 'canola.png' ), 'clashing base filename but not extension should have name changed when thumbnails use existing file\'s type' );
+                // Actual clash recognized.
+                $this->assertSame( 'canola-1.jpg', wp_unique_filename( $testdir, 'canola.jpg' ), 'existing file should have name changed' );
+
+                remove_filter( 'image_editor_output_format', array( $this, 'image_editor_output_format_handler' ) );
+                remove_filter( 'upload_dir', array( $this, 'upload_dir_patch_basedir' ) );
+        }
+
+        /**
+         * Changes the output format for a png file's generated thumbnails to be jpg.
+         *
+         * @param array $formats
+         *
+         * @return array
+         */
+        public function image_editor_output_format_handler( $formats ) {
+                $formats['image/png'] = 'image/jpeg';
+
+                return $formats;
+        }
+
+        /**
          * @dataProvider data_is_not_serialized
          */
         function test_maybe_serialize( $value ) {
@@ -1946 +1992 @@
                         array( 'application/activity+json, application/nojson', true ),
                 );
         }
+
+        /**
+         * @ticket 53668
+         */
+        public function test_wp_default_extension_for_mime_type() {
+                $this->assertEquals( 'jpg', wp_default_extension_for_mime_type( 'image/jpeg' ), 'jpg not returned as default extension for "image/jpeg"' );
+                $this->assertNotEquals( 'jpeg', wp_default_extension_for_mime_type( 'image/jpeg' ), 'jpeg should not be returned as default extension for "image/jpeg"' );
+                $this->assertEquals( 'png', wp_default_extension_for_mime_type( 'image/png' ), 'png not returned as default extension for "image/png"' );
+                $this->assertFalse( wp_default_extension_for_mime_type( 'wibble/wobble' ), 'false not returned for unrecognized mime type' );
+                $this->assertFalse( wp_default_extension_for_mime_type(), 'false not returned when no mime type supplied' );
+                $this->assertFalse( wp_default_extension_for_mime_type( '' ), 'false not returned when empty string as mime type supplied' );
+                $this->assertFalse( wp_default_extension_for_mime_type( '   ' ), 'false not returned when empty string as mime type supplied' );
+                $this->assertFalse( wp_default_extension_for_mime_type( 123 ), 'false not returned when int as mime type supplied' );
+                $this->assertFalse( wp_default_extension_for_mime_type( null ), 'false not returned when null as mime type supplied' );
+        }
 }