1 files changed, 67 insertions, 0 deletions
diff --git a/src/href.js b/src/href.js
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index 0000000..aea4015
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+++ b/src/href.js
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+/* As an anti-robot defense, <a> elements are initially coded with the
+** href= set to the honeypot, and <form> elements are initialized with
+** action= set to the login page.  The real values for href= and action=
+** are held in data-href= and data-action=.  The following code moves
+** data-href= into href= and data-action= into action= for all
+** <a> and <form> elements, after CSS has been loaded, and after a delay,
+** and maybe also after mouse movement is seen.
+**
+** Before sourcing this script, create a separate <script> element
+** (with type='application/json' to avoid Content Security Policy issues)
+** containing:
+**
+**     {"delay":MILLISECONDS, "mouseover":BOOLEAN}
+**
+** The <script> must have an id='href-data'.  DELAY is the number 
+** milliseconds delay prior to populating href= and action=.  If the
+** mouseover boolean is true, then the href= rewrite is further delayed
+** until the first mousedown event that occurs after the timer expires.
+*/
+var antiRobot = 0;
+function antiRobotGo(){
+  if( antiRobot!=3 ) return;
+  var z = window.getComputedStyle(document.body).zIndex;
+  if( z==='0' || z===0 ){
+    antiRobot = 7;
+    var anchors = document.getElementsByTagName("a");
+    for(var i=0; i<anchors.length; i++){
+      var j = anchors[i];
+      if(j.hasAttribute("data-href")) j.href=j.getAttribute("data-href");
+    }
+    var forms = document.getElementsByTagName("form");
+    for(var i=0; i<forms.length; i++){
+      var j = forms[i];
+      if(j.hasAttribute("data-action")) j.action=j.getAttribute("data-action");
+    }
+  }
+}
+function antiRobotDefense(){
+  var x = document.getElementById("href-data");
+  var jx = x.textContent || x.innerText;
+  var g = JSON.parse(jx);
+  if( g.mouseover ){
+    document.body.onmousedown=function(){
+      antiRobot |= 2;
+      antiRobotGo();
+      document.body.onmousedown=null;
+    }
+    document.body.onmousemove=function(){
+      antiRobot |= 2;
+      antiRobotGo();
+      document.body.onmousemove=null;
+    }
+  }else{
+    antiRobot |= 2;
+  }
+  if( g.delay>0 ){
+    setTimeout(function(){
+      antiRobot |= 1;
+      antiRobotGo();
+    }, g.delay)
+  }else{
+    antiRobot |= 1;
+  }
+  window.addEventListener('load',antiRobotGo);
+  antiRobotGo();
+}
+antiRobotDefense();