import sys
import urllib2
import urllib
import threading
import datetime

websites = []
websiteheaders = []


def logfile(websiteheaders, url):

    logfile = open ("logfile.txt", "a")

    for line in websiteheaders:
        if "Server" in line:
            timestamp = str(datetime.datetime.now())
            logfile.write("Timestamp: " + timestamp + "\n" )
            logfile.write("URL: " + url)
            logfile.write(line + "\n" )
            logfile.write("-------------------------------- \n" )

#        else:
#            timestamp = str(datetime.datetime.now())
#            logfile.write("Timestamp: " + timestamp + "\n" )
#            logfile.write("URL: " + url )
#            logfile.write("Server is not available in header \n" )
#            logfile.write("-------------------------------- \n ")

def headerophalen(websites):

    for url in websites:
        try:
            response = urllib2.urlopen(url)
            headers = str(response.info())
            websiteheaders.extend(headers.splitlines())
        except urllib2.HTTPError, error:
            print "Error opening URL: ", url, "HTTP Errorcode: ", error.code
            continue

    logfile(websiteheaders, url)

def main():

    hostsfile = open ("hosts.txt", "r")

    for line in hostsfile:
        websites.append("http://" + line)

    thread = threading.Thread(target=headerophalen, args=(websites,))
    thread.start()


if __name__=="__main__":

    main()