Support arbitrary attributes on elements with dashes in the tag name.

src/browser/ui/ReactDOMComponent.js

@@ -139,9 +139,12 @@ var omittedCloseTags = {
 // We accept any tag to be rendered but since this gets injected into abitrary
 // HTML, we want to make sure that it's a safe tag.
 // http://www.w3.org/TR/REC-xml/#NT-Name
-
 var VALID_TAG_REGEX = /^[a-zA-Z][a-zA-Z:_\.\-\d]*$/; // Simplified subset
 var validatedTagCache = {};
+
+var VALID_ATTRIBUTENAME_REGEX = /^[a-zA-Z_][a-zA-Z_\.\-\d]*$/; // Simplified subset
+var validatedAttributeNameCache = {};
+
 var hasOwnProperty = {}.hasOwnProperty;
 
 function validateDangerousTag(tag) {
@@ -151,6 +154,16 @@ function validateDangerousTag(tag) {
   }
 }
 
+function validateDangerousAttributeName(attributeName) {
+  if (!hasOwnProperty.call(validatedAttributeNameCache, attributeName)) {
+    invariant(VALID_ATTRIBUTENAME_REGEX.test(attributeName),
+      'Invalid attribute name: `%s`',
+      attributeName);
+    validatedAttributeNameCache[attributeName] = true;
+  }
+  return attributeName;
+}
+
 /**
  * Creates a new React class that is idempotent and capable of containing other
  * React components. It accepts event listeners and DOM properties that are
@@ -234,8 +247,13 @@ ReactDOMComponent.Mixin = {
           }
           propValue = CSSPropertyOperations.createMarkupForStyles(propValue);
         }
-        var markup =
-          DOMPropertyOperations.createMarkupForProperty(propKey, propValue);
+        var markup = null;
+        if (this._tag != null && this._tag.indexOf('-') >= 0) {
+          validateDangerousAttributeName(propKey);
+          markup = DOMPropertyOperations.createMarkupForCustomAttribute(propKey, propValue);
+        } else {
+          markup = DOMPropertyOperations.createMarkupForProperty(propKey, propValue);
+        }
         if (markup) {
           ret += ' ' + markup;
         }
@@ -398,6 +416,12 @@ ReactDOMComponent.Mixin = {
         }
       } else if (registrationNameModules.hasOwnProperty(propKey)) {
         putListener(this._rootNodeID, propKey, nextProp, transaction);
+      } else if (this._tag.indexOf('-') >= 0) {
+        BackendIDOperations.updateAttributeByID(
+          this._rootNodeID,
+          propKey,
+          nextProp
+        );
       } else if (
           DOMProperty.isStandardName[propKey] ||
           DOMProperty.isCustomAttribute(propKey)) {

src/browser/ui/ReactDOMIDOperations.js

@@ -68,6 +68,32 @@ var ReactDOMIDOperations = {
     }
   },
 
+  /**
+   * Updates a DOM node with new property values.
+   *
+   * @param {string} id ID of the node to update.
+   * @param {string} name A valid property name.
+   * @param {*} value New value of the property.
+   * @internal
+   */
+  updateAttributeByID: function(id, name, value) {
+    var node = ReactMount.getNode(id);
+    invariant(
+      !INVALID_PROPERTY_ERRORS.hasOwnProperty(name),
+      'updatePropertyByID(...): %s',
+      INVALID_PROPERTY_ERRORS[name]
+    );
+
+    // If we're updating to null or undefined, we should remove the property
+    // from the DOM node instead of inadvertantly setting to a string. This
+    // brings us in line with the same behavior we have on initial render.
+    if (value == null) {
+      node.removeAttribute(name);
+    } else {
+      node.setAttribute(name, '' + value);
+    }
+  },
+
   /**
    * Updates a DOM node to remove a property. This should only be used to remove
    * DOM properties in `DOMProperty`.

src/browser/ui/__tests__/ReactDOMComponent-test.js

@@ -140,6 +140,51 @@ describe('ReactDOMComponent', function() {
       expect(stubStyle.color).toEqual('green');
     });
 
+    it('should reject haxors on initial markup', function() {
+      var container = document.createElement('div');
+
+      expect(function() {
+        var element = React.createElement(
+          'x-foo-component',
+          {'blah" onclick="beevil" noise="hi': 'selected'},
+          null
+        );
+        React.render(element, container);
+      }).toThrow();
+    });
+
+    it('should reject haxors on update', function() {
+      var container = document.createElement('div');
+
+      var beforeUpdate = React.createElement('x-foo-component', {}, null);
+      React.render(beforeUpdate, container);
+
+      expect(function() {
+        var afterUpdate = React.createElement(
+          'x-foo-component',
+          {'blah" onclick="beevil" noise="hi': 'selected'},
+          null
+        );
+        React.render(afterUpdate, container);
+      }).toThrow();
+    });
+
+    it('should update arbitrary attributes for tags containnig dashes', function() {
+      var container = document.createElement('div');
+
+      var beforeUpdate = React.createElement('x-foo-component', {}, null);
+      React.render(beforeUpdate, container);
+
+      var afterUpdate = React.createElement(
+        'x-foo-component',
+        {'myattr': 'myval'},
+        null
+      );
+      React.render(afterUpdate, container);
+
+      expect(container.childNodes[0].getAttribute('myattr')).toBe('myval');
+    });
+
     it("should clear all the styles when removing 'style'", function() {
       var styles = {display: 'none', color: 'red'};
       var container = document.createElement('div');

src/browser/ui/dom/DOMPropertyOperations.js

@@ -15,6 +15,7 @@
 var DOMProperty = require('DOMProperty');
 
 var escapeTextContentForBrowser = require('escapeTextContentForBrowser');
+var invariant = require('invariant');
 var quoteAttributeValueForBrowser = require('quoteAttributeValueForBrowser');
 var warning = require('warning');
 
@@ -111,6 +112,22 @@ var DOMPropertyOperations = {
     return null;
   },
 
+  /**
+   * Creates markup for a custom property.
+   *
+   * @param {string} tagName
+   * @param {string} name
+   * @param {*} value
+   * @return {?string} Markup string, or null if the property was invalid.
+   */
+  createMarkupForCustomAttribute: function(name, value)
+  {
+    if (value == null) {
+      return '';
+    }
+    return name + '=' + quoteAttributeValueForBrowser(value);
+  },
+
   /**
    * Sets the value for a property on a node.
    *

src/browser/ui/dom/__tests__/DOMPropertyOperations-test.js

@@ -174,6 +174,21 @@ describe('DOMPropertyOperations', function() {
 
   });
 
+  describe('createMarkupForProperty', function() {
+
+    it('should allow custom properties on web components', function() {
+      expect(DOMPropertyOperations.createMarkupForCustomAttribute(
+        'awesomeness',
+        5
+      )).toBe('awesomeness="5"');
+
+      expect(DOMPropertyOperations.createMarkupForCustomAttribute(
+        'dev',
+        'jim'
+      )).toBe('dev="jim"');
+    });
+  });
+
   describe('setValueForProperty', function() {
     var stubNode;