refactor jsx-no-target-blank.js with ES2015 features

Author: gfx

lib/rules/jsx-no-target-blank.js

@@ -8,6 +8,31 @@
 // Rule Definition
 // ------------------------------------------------------------------------------
 
+function isTargetBlank(attr) {
+  return attr.name.name === 'target' &&
+    attr.value.type === 'Literal' &&
+    attr.value.value.toLowerCase() === '_blank';
+}
+
+function hasExternalLink(element) {
+  return element.attributes.find(function (attr) {
+    return attr.name &&
+      attr.name.name === 'href' &&
+      attr.value.type === 'Literal' &&
+      /^(?:\w+:|\/\/)/.test(attr.value.value);
+  });
+}
+
+function hasSecureRel(element) {
+  return element.attributes.find(function (attr) {
+    if (attr.name.name === 'rel') {
+      var tags = attr.value.type === 'Literal' && attr.value.value.toLowerCase().split(' ');
+      return !tags || (tags.indexOf('noopener') >= 0 && tags.indexOf('noreferrer') >= 0);
+    }
+    return false;
+  });
+}
+
 module.exports = {
   meta: {
     docs: {
@@ -26,38 +51,12 @@ module.exports = {
         }
 
         if (
-          node.name.name === 'target' &&
-          node.value.type === 'Literal' &&
-          node.value.value.toLowerCase() === '_blank'
+          isTargetBlank(node) &&
+          hasExternalLink(node.parent) &&
+          !hasSecureRel(node.parent)
         ) {
-          var relFound = false;
-          var attrs = node.parent.attributes;
-          for (var idx in attrs) {
-            if (!Object.prototype.hasOwnProperty.call(attrs, idx)) {
-              continue;
-            }
-            var attr = attrs[idx];
-            if (!attr.name) {
-              continue;
-            }
-            if (attr.name.name === 'href') {
-              if (attr.value.type === 'Literal' && !/^(?:\w+:|\/\/)/.test(attr.value.value)) {
-                // it's safe because it is not an external link (i.e. doesn't start with a protocol)
-                return;
-              }
-            }
-            if (attr.name.name === 'rel') {
-              var tags = attr.value.type === 'Literal' && attr.value.value.toLowerCase().split(' ');
-              if (!tags || (tags.indexOf('noopener') >= 0 && tags.indexOf('noreferrer') >= 0)) {
-                relFound = true;
-                break;
-              }
-            }
-          }
-          if (!relFound) {
-            context.report(node, 'Using target="_blank" without rel="noopener noreferrer" ' +
-            'is a security risk: see https://mathiasbynens.github.io/rel-noopener');
-          }
+          context.report(node, 'Using target="_blank" without rel="noopener noreferrer" ' +
+          'is a security risk: see https://mathiasbynens.github.io/rel-noopener');
         }
       }
     };