[AIRFLOW-5597] Linkify urls in task instance log (apache#6265)

airflow/www/templates/airflow/ti_log.html

@@ -121,10 +121,18 @@ <h4>{{ title }}</h4>
           if (res.message) {
             // Auto scroll window to the end if current window location is near the end.
             if(auto_tailing && checkAutoTailingCondition()) {
-              var should_scroll = true
+              var should_scroll = true;
             }
             // The message may contain HTML, so either have to escape it or write it as text.
-            document.getElementById(`try-${try_number}`).textContent += res.message + "\n";
+            var escaped_message = escapeHtml(res.message);
+
+            // Detect urls
+            var url_regex = /http(s)?:\/\/[\w\.\-]+(\.?:[\w\.\-]+)*([\/?#][\w\-\._~:/?#[\]@!\$&'\(\)\*\+,;=\.%]+)?/g;
+            var linkified_message = escaped_message.replace(url_regex, function(url) {
+              return "<a href=\"" + url + "\" target=\"_blank\">" + url + "</a>";
+            });
+
+            document.getElementById(`try-${try_number}`).innerHTML += linkified_message + "<br/>";
             // Auto scroll window to the end if current window location is near the end.
             if(should_scroll) {
               scrollBottom();