tools: add nfd-status-http-server.py as standalone http server

Change-Id: Ibb4a272d716b7f4c80b0e81be1fb86c3c5a13529
refs: #1181
diff --git a/tools/nfd-status-http-server.py b/tools/nfd-status-http-server.py
new file mode 100755
index 0000000..5221399
--- /dev/null
+++ b/tools/nfd-status-http-server.py
@@ -0,0 +1,160 @@
+#!/usr/bin/env python2.7
+
+from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer
+from SocketServer import ThreadingMixIn
+import sys
+import commands
+import StringIO
+import urlparse
+import logging
+import cgi
+import argparse
+
+
+class StatusHandler(BaseHTTPRequestHandler):
+    """ The handler class to handle requests."""
+    def do_GET(self):
+        # get the url info to decide how to respond
+        parsedPath = urlparse.urlparse(self.path)
+        resultMessage = ""
+        if parsedPath.path == "/robots.txt":
+            if self.server.robots == False:
+                # return User-agent: * Disallow: / to disallow robots
+                resultMessage = "User-agent: * \nDisallow: /\n"
+            self.send_response(200)
+            self.send_header("Content-type", "text/plain")
+        elif parsedPath.path == "/":
+            # get current nfd status, and use it as result message
+            resultMessage = self.getNfdStatus()
+            self.send_response(200)
+            self.send_header("Content-type", "text/html; charset=UTF-8")
+        else:
+            # non-existing content
+            resultMessage = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 '\
+                   + 'Transitional//EN" '\
+                   + '"http://www.w3.org/TR/html4/loose.dtd">\n'\
+                   + '<html><head><title>Object not '\
+                   + 'found!</title><meta http-equiv="Content-type" ' \
+                   + 'content="text/html;charset=UTF-8"></head>\n'\
+                   + '<body><h1>Object not found!</h1>'\
+                   + '<p>The requested URL was not found on this server.</p>'\
+                   + '<h2>Error 404</h2>'\
+                   + '</body></html>'
+            self.send_response(404)
+            self.send_header("Content-type", "text/html; charset=UTF-8")
+
+        self.end_headers()
+        self.wfile.write(resultMessage)
+
+    def do_HEAD(self):
+        self.send_response(405)
+        self.send_header("Content-type", "text/plain")
+        self.end_headers()
+
+    def do_POST(self):
+        self.send_response(405)
+        self.send_header("Content-type", "text/plain")
+        self.end_headers()
+
+    def log_message(self, format, *args):
+        if self.server.verbose:
+            logging.info("%s - [%s] %s\n" % (self.address_string(),
+                         self.log_date_time_string(), format % args))
+
+    def getNfdStatus(self):
+        """
+        This function tries to call nfd-status command
+        to get nfd's current status, after convert it
+        to html format, return it to the caller
+        """
+        (res, output) = commands.getstatusoutput('nfd-status')
+
+        htmlStr = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional'\
+                + '//EN" "http://www.w3.org/TR/html4/loose.dtd">\n'\
+                + '<html><head><title>NFD status</title>'\
+                + '<meta http-equiv="Content-type" content="text/html;'\
+                + 'charset=UTF-8"></head>\n<body>'
+        if res == 0:
+            # parse the output
+            buf = StringIO.StringIO(output)
+            firstLine = 0
+            for line in buf:
+                if line.endswith(":\n"):
+                    if firstLine != 0:
+                        htmlStr += "</ul>\n"
+                    firstLine += 1
+                    htmlStr += "<b>" + cgi.escape(line.strip()) + "</b><br>\n"\
+                             + "<ul>\n"
+                    continue
+                line = line.strip()
+                htmlStr += "<li>" + cgi.escape(line) + "</li>\n"
+            buf.close()
+            htmlStr += "</ul>\n"
+        else:
+            # return connection error code
+            htmlStr = htmlStr + "<p>Cannot connect to NFD,"\
+                    + " Code = " + str(res) + "</p>\n"
+        htmlStr = htmlStr + "</body></html>"
+        return htmlStr
+
+
+class ThreadHTTPServer(ThreadingMixIn, HTTPServer):
+    """ Handle requests using threads"""
+    def __init__(self, server, handler, verbose=False, robots=False):
+        try:
+            HTTPServer.__init__(self, server, handler)
+        except Exception as e:
+            logging.error(str(e))
+            sys.exit(2)
+        self.verbose = verbose
+        self.robots = robots
+
+
+# main function to start
+def httpServer():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("-p", type=int, metavar="port number",
+                        help="Specify the HTTP server port number, default is 8080.",
+                        dest="port", default=8080)
+    # if address is not specified, using empty str
+    # so it can bind to local address
+    parser.add_argument("-a", default="localhost", metavar="IP address", dest="addr",
+                        help="Specify the HTTP server IP address.")
+    parser.add_argument("-r", default=False, dest="robots", action="store_true",
+                        help="Enable HTTP robots to crawl; disabled by default.")
+    parser.add_argument("-v", default=False, dest="verbose", action="store_true",
+                        help="Verbose mode.")
+
+    args = vars(parser.parse_args())
+    localPort = args["port"]
+    localAddr = args["addr"]
+    verbose = args["verbose"]
+    robots = args["robots"]
+
+    # setting log message format
+    logging.basicConfig(format='%(asctime)s [%(levelname)s] %(message)s',
+                        level=logging.INFO)
+
+    # if port is not valid, exit
+    if localPort <= 0 or localPort > 65535:
+        logging.error("Specified port number is invalid")
+        sys.exit(2)
+
+    httpd = ThreadHTTPServer((localAddr, localPort), StatusHandler,
+                             verbose, robots)
+
+    logging.info("Server Starts - at http://%s:%s" % httpd.server_address)
+
+    try:
+        httpd.serve_forever()
+    except KeyboardInterrupt:
+        pass
+
+    logging.info("Server stopping ...")
+    httpd.server_close()
+
+    logging.info("Server Stopped - at http://%s:%s" % httpd.server_address)
+
+
+if __name__ == '__main__':
+    httpServer()