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-rw-r--r--includes/libs/CSSMin.php47
1 files changed, 33 insertions, 14 deletions
diff --git a/includes/libs/CSSMin.php b/includes/libs/CSSMin.php
index 8b0e2873..4f142fc7 100644
--- a/includes/libs/CSSMin.php
+++ b/includes/libs/CSSMin.php
@@ -82,10 +82,38 @@ class CSSMin {
}
/**
+ * Encode an image file as a base64 data URI.
+ * If the image file has a suitable MIME type and size, encode it as a
+ * base64 data URI. Return false if the image type is unfamiliar or exceeds
+ * the size limit.
+ *
+ * @param string $file Image file to encode.
+ * @param string|null $type File's MIME type or null. If null, CSSMin will
+ * try to autodetect the type.
+ * @param int|bool $sizeLimit If the size of the target file is greater than
+ * this value, decline to encode the image file and return false
+ * instead. If $sizeLimit is false, no limit is enforced.
+ * @return string|bool: Image contents encoded as a data URI or false.
+ */
+ public static function encodeImageAsDataURI( $file, $type = null, $sizeLimit = self::EMBED_SIZE_LIMIT ) {
+ if ( $sizeLimit !== false && filesize( $file ) >= $sizeLimit ) {
+ return false;
+ }
+ if ( $type === null ) {
+ $type = self::getMimeType( $file );
+ }
+ if ( !$type ) {
+ return false;
+ }
+ $data = base64_encode( file_get_contents( $file ) );
+ return 'data:' . $type . ';base64,' . $data;
+ }
+
+ /**
* @param $file string
* @return bool|string
*/
- protected static function getMimeType( $file ) {
+ public static function getMimeType( $file ) {
$realpath = realpath( $file );
// Try a couple of different ways to get the mime-type of a file, in order of
// preference
@@ -174,23 +202,14 @@ class CSSMin {
// using Z for the timezone, meaning GMT
$url .= '?' . gmdate( 'Y-m-d\TH:i:s\Z', round( filemtime( $file ), -2 ) );
// Embedding requires a bit of extra processing, so let's skip that if we can
- if ( $embedData && $embed ) {
- $type = self::getMimeType( $file );
- // Detect when URLs were preceeded with embed tags, and also verify file size is
- // below the limit
- if (
- $type
- && $match['embed'][1] > 0
- && filesize( $file ) < self::EMBED_SIZE_LIMIT
- ) {
- // Strip off any trailing = symbols (makes browsers freak out)
- $data = base64_encode( file_get_contents( $file ) );
+ if ( $embedData && $embed && $match['embed'][1] > 0 ) {
+ $data = self::encodeImageAsDataURI( $file );
+ if ( $data !== false ) {
// Build 2 CSS properties; one which uses a base64 encoded data URI in place
// of the @embed comment to try and retain line-number integrity, and the
// other with a remapped an versioned URL and an Internet Explorer hack
// making it ignored in all browsers that support data URIs
- $replacement = "{$pre}url(data:{$type};base64,{$data}){$post};";
- $replacement .= "{$pre}url({$url}){$post}!ie;";
+ $replacement = "{$pre}url({$data}){$post};{$pre}url({$url}){$post}!ie;";
}
}
if ( $replacement === false ) {