#!/usr/bin/python
# -*- coding: utf-8 -*-

# written by seba (seba-geek.de) :)
# v0.3

import BaseHTTPServer
import sys
import os
import urllib
from stat import ST_SIZE
import SocketServer
import socket
import commands

class FileHandler(BaseHTTPServer.BaseHTTPRequestHandler):
	fileName = "Undefined"
	filePath = "/dev/null"
	fileLength = 0
	blockSize = 1024 * 1024
	
	def do_GET(self):
		if urllib.unquote(self.path) != "/" + self.fileName:
			self.send_response(302)
			self.send_header('Location', '/' + self.fileName)
			self.end_headers()
			return

		myfile = open(self.filePath, 'rb')
		
		# find out if this is a continuing download
		fromto = None
		cont =  self.headers.get("Range")
		if cont != None:
			cont = cont.split("=")
			if len(cont) > 1 and cont[0] == 'bytes':
				fromto = cont[1].split('-')
				if len(fromto) > 1:
					if fromto[1] == '':
						fromto[1] = self.fileLength-1
					fromto[0] = int(fromto[0])
					fromto[1] = int(fromto[1])
					if fromto[0] >= self.fileLength or fromto[0] < 0 or fromto[1] >= self.fileLength or fromto[1]-fromto[0] < 0:
						# oops, already done!
						self.send_response(416)
						self.send_header('Content-Range', 'bytes */%s' % self.fileLength)
						self.end_headers()
						return
					# now we can wind the file *brrrrrr*
					myfile.seek(fromto[0])
		
		if fromto != None:
			self.send_response(216)
			self.send_header('Content-Range', 'bytes %s-%s/%s' % (fromto[0], fromto[1], self.fileLength))
			self.send_header('Content-Length', fromto[1]-fromto[0]+1)
		else:
			self.send_response(200)
			self.send_header('Content-Length', self.fileLength)
		self.send_header('Content-Disposition', 'attachment; filename="%s"' % self.fileName)
		self.send_header('Content-type', 'application/octet-stream')
		self.send_header('Content-Transfer-Encoding', ' binary')
		self.end_headers()
		block = self.getChunk(myfile, fromto)
		while block:
			try:
				self.wfile.write(block)
			except socket.error, e:
				print "%s ABORTED transmission (Reason %s: %s)" % (self.client_address[0], e[0], e[1])
				return
			block = self.getChunk(myfile, fromto)
		myfile.close()
		print "%s finished downloading" % (self.client_address[0])
		return
	
	def getChunk(self, myfile, fromto):
		if fromto != None and myfile.tell()+self.blockSize >= fromto[1]:
			readsize = fromto[1]-myfile.tell()+1
		else:
			readsize = self.blockSize
		return myfile.read(readsize)

class ThreadedHTTPServer(SocketServer.ThreadingMixIn, BaseHTTPServer.HTTPServer):
	pass

def main():
	if len(sys.argv) < 2 or len(sys.argv) > 3 or sys.argv[1] in ('-h', '--help'):
		print "Usage: [path to file] <port=8080>"
		return
	
	port = 8080
	if len(sys.argv) == 3:
		try:
			port = int(sys.argv[2])
		except ValueError:
			print "Error: Port should be an int!"
			return
	
	try:
		testit = open(sys.argv[1], 'r')
		testit.close()
		FileHandler.filePath = sys.argv[1]
		FileHandler.fileName = os.path.basename(sys.argv[1])
		FileHandler.fileLength = os.stat(sys.argv[1])[ST_SIZE]
	except IOError:
		print "Error: Could not open file!"
		return
	
	server = ThreadedHTTPServer(('', port), FileHandler)
	print "Serving:", sys.argv[1]
	print "Port: ", port
	print "Ready..."
	server.address_family = 10
	# print urls with local network adresses
	print "Some addresses this file will be available under:"
	ips = commands.getoutput(r"/sbin/ifconfig |grep 'inet6\?'|grep -v 127.0.0.1|grep -v ' fe80'|grep -v ::1|sed -n 's/.*inet6\?[a-zA-Z: -]\+\([0-9a-fA-F.:]*\).*/\1/p'")
	for ip in ips.split("\n"):
		if ip.find(":") >= 0:
			ip = "[%s]" % ip # must be v6...
			continue	# FIXME: When BaseHTTP supports ipv6 properly, delete this line
		print "http://%s:%d" % (ip, port)
	
	try:
		server.serve_forever()
	except KeyboardInterrupt:
		server.socket.close()
	print "Good bye.."

if __name__ == '__main__':
	main()