nfd-status-http-server: inject XSLT polyfill

Refs: #5385
Change-Id: I3595d0d300b02736cacbed525e81e457cf65c9f7

Author: Pesa

README.md

@@ -68,3 +68,5 @@ NFD contains third-party software, licensed under the following licenses:
 * The *WebSocket++* library is licensed under the
   [3-clause BSD license](https://github.com/zaphoyd/websocketpp/blob/0.8.1/COPYING)
 * The *waf* build system is licensed under the [3-clause BSD license](waf)
+* *XSLT Polyfill* is licensed under the
+  [3-clause BSD license](https://github.com/mfreed7/xslt_polyfill/blob/main/LICENSE)

tools/nfd-status-http-server-files/xslt-polyfill.min.js

@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 """
-Copyright (c) 2014-2024,  Regents of the University of California,
+Copyright (c) 2014-2026,  Regents of the University of California,
                           Arizona Board of Regents,
                           Colorado State University,
                           University Pierre & Marie Curie, Sorbonne University,
@@ -62,6 +62,9 @@ def __serve_report(self):
             # (yes, this is a ugly hack)
             if (pos := output.find(">") + 1) != 0:
                 xml = output[:pos] + '<?xml-stylesheet type="text/xsl" href="nfd-status.xsl"?>' + output[pos:]
+                rootstart = xml.find("<nfdStatus")
+                if rootstart != -1 and (rootend := xml.find(">", rootstart) + 1) != 0:
+                    xml = xml[:rootend] + '<script src="xslt-polyfill.min.js" xmlns="http://www.w3.org/1999/xhtml"></script>' + xml[rootend:]
                 self.send_response(200)
                 self.send_header("Content-Type", "text/xml; charset=UTF-8")
                 self.end_headers()