Make isSafe* public

Fixes #1780

CHANGES

@@ -35,6 +35,9 @@ Release 1.16.2 [PENDING]
   * Improvement: in forms, <input type="image"> should be excluded from formData() (and hence from form submissions).
     <https://github.com/jhy/jsoup/pull/2010>
 
+  * Improvement: in Safelist, made isSafeTag and isSafeAttribute public methods, for extensibility.
+    <https://github.com/jhy/jsoup/issues/1780>
+
   * Bugfix: `form` elements and empty elements (such as `img`) did not have their attributes de-duplicated.
     <https://github.com/jhy/jsoup/pull/1950>
 

src/main/java/org/jsoup/safety/Safelist.java

@@ -522,22 +522,22 @@ public Safelist removeProtocols(String tag, String attribute, String... removePr
     }
 
     /**
-     * Test if the supplied tag is allowed by this safelist
+     * Test if the supplied tag is allowed by this safelist.
      * @param tag test tag
      * @return true if allowed
      */
-    protected boolean isSafeTag(String tag) {
+    public boolean isSafeTag(String tag) {
         return tagNames.contains(TagName.valueOf(tag));
     }
 
     /**
-     * Test if the supplied attribute is allowed by this safelist for this tag
+     * Test if the supplied attribute is allowed by this safelist for this tag.
      * @param tagName tag to consider allowing the attribute in
      * @param el element under test, to confirm protocol
      * @param attr attribute under test
      * @return true if allowed
      */
-    protected boolean isSafeAttribute(String tagName, Element el, Attribute attr) {
+    public boolean isSafeAttribute(String tagName, Element el, Attribute attr) {
         TagName tag = TagName.valueOf(tagName);
         AttributeKey key = AttributeKey.valueOf(attr.getKey());