Update baidupush (iissnan#1482)

Author: 799953468

layout/_third-party/baidu-push.swig

@@ -1,11 +1,27 @@
 {%- if theme.baidu_push %}
   <script{{ pjax }}>
     (function(){
-      var bp = document.createElement('script');
-      var curProtocol = window.location.protocol.split(':')[0];
-      bp.src = (curProtocol === 'https') ? 'https://zz.bdstatic.com/linksubmit/push.js' : 'http://push.zhanzhang.baidu.com/push.js';
-      var s = document.getElementsByTagName("script")[0];
-      s.parentNode.insertBefore(bp, s);
-    })();
+      var canonicalURL, curProtocol;
+      //Get the <link> tag
+      var x=document.getElementsByTagName("link");
+		//Find the last canonical URL
+		if(x.length > 0){
+			for (i=0;i<x.length;i++){
+				if(x[i].rel.toLowerCase() == 'canonical' && x[i].href){
+					canonicalURL=x[i].href;
+				}
+			}
+		}
+    //Get protocol
+	    if (!canonicalURL){
+	    	curProtocol = window.location.protocol.split(':')[0];
+	    }
+	    else{
+	    	curProtocol = canonicalURL.split(':')[0];
+	    }
+      //Get current URL if the canonical URL does not exist
+	    if (!canonicalURL) canonicalURL = window.location.href;
+	    //Assign script content. Replace current URL with the canonical URL
+      !function(){var e=/([http|https]:\/\/[a-zA-Z0-9\_\.]+\.baidu\.com)/gi,r=canonicalURL,t=document.referrer;if(!e.test(r)){var n=(String(curProtocol).toLowerCase() === 'https')?"https://sp0.baidu.com/9_Q4simg2RQJ8t7jm9iCKT-xh_/s.gif":"//api.share.baidu.com/s.gif";t?(n+="?r="+encodeURIComponent(document.referrer),r&&(n+="&l="+r)):r&&(n+="?l="+r);var i=new Image;i.src=n}}(window);})();
   </script>
 {%- endif %}