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-rw-r--r--library/HTMLPurifier/AttrTransform/ImgRequired.php43
1 files changed, 43 insertions, 0 deletions
diff --git a/library/HTMLPurifier/AttrTransform/ImgRequired.php b/library/HTMLPurifier/AttrTransform/ImgRequired.php
new file mode 100644
index 000000000..7f0e4b7a5
--- /dev/null
+++ b/library/HTMLPurifier/AttrTransform/ImgRequired.php
@@ -0,0 +1,43 @@
+<?php
+
+// must be called POST validation
+
+/**
+ * Transform that supplies default values for the src and alt attributes
+ * in img tags, as well as prevents the img tag from being removed
+ * because of a missing alt tag. This needs to be registered as both
+ * a pre and post attribute transform.
+ */
+class HTMLPurifier_AttrTransform_ImgRequired extends HTMLPurifier_AttrTransform
+{
+
+ public function transform($attr, $config, $context) {
+
+ $src = true;
+ if (!isset($attr['src'])) {
+ if ($config->get('Core.RemoveInvalidImg')) return $attr;
+ $attr['src'] = $config->get('Attr.DefaultInvalidImage');
+ $src = false;
+ }
+
+ if (!isset($attr['alt'])) {
+ if ($src) {
+ $alt = $config->get('Attr.DefaultImageAlt');
+ if ($alt === null) {
+ // truncate if the alt is too long
+ $attr['alt'] = substr(basename($attr['src']),0,40);
+ } else {
+ $attr['alt'] = $alt;
+ }
+ } else {
+ $attr['alt'] = $config->get('Attr.DefaultInvalidImageAlt');
+ }
+ }
+
+ return $attr;
+
+ }
+
+}
+
+// vim: et sw=4 sts=4