Don't match network filter-derived regexes against non-network URIs

Context: element picker

Related issue:
uBlockOrigin/uBlock-issues#3142

src/js/scriptlets/epicker.js

@@ -619,6 +619,21 @@ const filterToDOMInterface = (( ) => {
  const reCaret = '(?:[^%.0-9a-z_-]|$)';
  const rePseudoElements = /:(?::?after|:?before|:[a-z-]+)$/;
 
+ const matchElemToRegex = (elem, re) => {
+ const srcProp = netFilter1stSources[elem.localName];
+ let src = elem[srcProp];
+ if ( src instanceof SVGAnimatedString ) {
+ src = src.baseVal;
+ }
+ if ( typeof src === 'string' && /^https?:\/\//.test(src) ) {
+ if ( re.test(src) ) { return srcProp; }
+ }
+ src = elem.currentSrc;
+ if ( typeof src === 'string' && /^https?:\/\//.test(src) ) {
+ if ( re.test(src) ) { return srcProp; }
+ }
+ };
+
  // Net filters: we need to lookup manually -- translating into a foolproof
  // CSS selector is just not possible.
  //
@@ -672,28 +687,21 @@ const filterToDOMInterface = (( ) => {
  // Lookup by tag names.
  // https://github.com/uBlockOrigin/uBlock-issues/issues/2260
  // Maybe get to the actual URL indirectly.
+ //
+ // https://github.com/uBlockOrigin/uBlock-issues/issues/3142
+ // Don't try to match against non-network URIs.
  const elems = document.querySelectorAll(
  Object.keys(netFilter1stSources).join()
  );
  for ( const elem of elems ) {
- const srcProp = netFilter1stSources[elem.localName];
- let src = elem[srcProp];
- if ( src instanceof SVGAnimatedString ) {
- src = src.baseVal;
- }
- if (
- typeof src === 'string' &&
- reFilter.test(src) ||
- typeof elem.currentSrc === 'string' &&
- reFilter.test(elem.currentSrc)
- ) {
- out.push({
- elem,
- src: srcProp,
- opt: filterTypes[elem.localName],
- style: vAPI.hideStyle,
- });
- }
+ const srcProp = matchElemToRegex(elem, reFilter);
+ if ( srcProp === undefined ) { continue; }
+ out.push({
+ elem,
+ src: srcProp,
+ opt: filterTypes[elem.localName],
+ style: vAPI.hideStyle,
+ });
  }
 
  // Find matching background image in current set of candidate elements.