fix($compile): disallow interpolations for DOM event handlers

BREAKING CHANGE: Interpolations inside DOM event handlers are
    disallowed.  DOM event handlers execute arbitrary Javascript code.
    Using an interpolation for such handlers means that the interpolated
    value is a JS string that is evaluated.  Storing or generating such
    strings is error prone and likely leads to an XSS if you're not
    super careful.  On the other hand, ng-click and such event handlers
    evaluate Angular expressions that are a lot safer (e.g. No direct
    access to global objects - only scope), cleaner and harder to
    exploit.

    To migrate the code follow the example below:

    Before:

        JS:   scope.foo = 'alert(1)';
        HTML: <div onclick="{{foo}}">

    After:

        JS:   scope.foo = function() { alert(1); }
        HTML: <div ng-click="foo()">

1 files changed, 10 insertions, 0 deletions

diff --git a/src/ng/compile.js b/src/ng/compile.js
index d85af28c..91844f45 100644
--- a/src/ng/compile.js
+++ b/src/ng/compile.js
@@ -155,6 +155,10 @@ function $CompileProvider($provide) {
       CLASS_DIRECTIVE_REGEXP = /(([\d\w\-_]+)(?:\:([^;]+))?;?)/,
       urlSanitizationWhitelist = /^\s*(https?|ftp|mailto|file):/;
 
+  // Ref: http://developers.whatwg.org/webappapis.html#event-handler-idl-attributes
+  // The assumption is that future DOM event attribute names will begin with
+  // 'on' and be composed of only English letters.
+  var EVENT_HANDLER_ATTR_REGEXP = /^(on[a-z]*|formaction)$/;
 
   /**
    * @ngdoc function
@@ -1165,6 +1169,12 @@ function $CompileProvider($provide) {
         compile: valueFn(function attrInterpolateLinkFn(scope, element, attr) {
           var $$observers = (attr.$$observers || (attr.$$observers = {}));
 
+          if (EVENT_HANDLER_ATTR_REGEXP.test(name)) {
+            throw $compileMinErr('nodomevents',
+                "Interpolations for HTML DOM event attributes are disallowed.  Please use the ng- " +
+                "versions (such as ng-click instead of onclick) instead.");
+          }
+
           // we need to interpolate again, in case the attribute value has been updated
           // (e.g. by another directive's compile function)
           interpolateFn = $interpolate(attr[name], true);