#!/usr/bin/python

from __future__ import division

import cgitb; cgitb.enable()

import os.path
import sys
import cgi
import math
import Image
import cStringIO as StringIO

MAX_SIZE = 1024

basepath = r"PATH TO IMAGES HERE"

form = cgi.FieldStorage()
filename = form.getfirst('file', '')
size = form.getfirst('size', 'null')
mode = None

filename = os.path.normpath(basepath + "/" + filename)
if not filename.startswith(basepath):
    filename = ''

if size[0] in 'wh':
    mode = size[0]
    size = size[1:]

try:
    size = int(size, 10)
except ValueError:
    size = None

if not filename or not size or size > MAX_SIZE:
    print "Content-type: text/plain\n"
    print "Error: invalid input."
    sys.exit()

try:
	image = Image.open(filename)
except IOError:
	print "Content-type: text/plain\n"
	print "Image not found."
	sys.exit()

w, h = image.size

# Fixed width
if mode == 'w':
    perc = size / w
    newsize = (size, math.floor(h * perc))

# Fixed height
elif mode == 'h':
    perc = size / h
    newsize = (math.floor(w * perc), size)

# Maximum dimension
else:
    if w == h:
		newsize = (size, size)
    elif w > h:
		newsize = (size, math.floor((size / w) * h))
    else:
		newsize = (math.floor((size / h) * w), size)

f = StringIO.StringIO()
resized = image.resize(newsize, Image.ANTIALIAS)
resized.save(f, 'JPEG', quality=50, progression=True)

v = f.getvalue()
print "Content-type: image/jpeg"
print "Cache-control: max-age=%s" % (60 * 60 * 24 * 360,) # 1 year
print 
sys.stdout.write(v)
sys.stdout.flush()