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#!/usr/bin/env python2.6
import hmac
import urllib2
import urlparse
from cStringIO import StringIO
from PIL import Image, ImageOps
from PIL.ImageFileIO import ImageFileIO
def crop_image(img, width, height):
src_width, src_height = img.size
src_ratio = float(src_width) / float(src_height)
dst_width, dst_height = int(width), int(height)
dst_ratio = float(dst_width) / float(dst_height)
if dst_ratio < src_ratio:
crop_height = src_height
crop_width = crop_height * dst_ratio
x_offset = float(src_width - crop_width) / 2
y_offset = 0
else:
crop_width = src_width
crop_height = crop_width / dst_ratio
x_offset = 0
y_offset = float(src_height - crop_height) / 3
img = img.crop((x_offset, y_offset, x_offset+int(crop_width), y_offset+int(crop_height)))
return img
def calculate_size(img, long_side):
width, height = img.size
width, height = float(width), float(height)
if height > width:
width = (width / height) * long_side
height = long_side
else:
height = (height / width) * long_side
width = long_side
return width, height
def load_remote_image(url):
return Image.open(ImageFileIO(urllib2.urlopen(url)))
def create_thumbnail(img, long_side):
width, height = calculate_size(img, int(long_side))
img.thumbnail((width, height), Image.ANTIALIAS)
return img
def desaturate_image(img):
img = ImageOps.grayscale(img)
return img
KEY = ""
OPERATIONS = {
"thumb": (create_thumbnail, 1),
"crop": (crop_image, 2),
"desaturate": (desaturate_image, 0),
}
def generate_sig(query):
clean = ["{0}{1}".format(k,v) for k, v in query if k != "sig"]
return hmac.new(KEY, "".join(clean)).hexdigest()
def thumbnailer_app(environ, start_response):
to_do = []
qs = []
for tup in urlparse.parse_qsl(environ.get('QUERY_STRING', '')):
if tup[0] == "sig":
sig = tup[1]
else:
qs.append(tup)
# Validate
if generate_sig(qs) != sig:
start_response('401 Forbidden', [('Content-Type', 'text/plain')])
return ["You may not use the thumbnailer for that site."]
need_values = 0
for key, value in qs:
if need_values > 0:
to_do[-1].append(value)
need_values -= 1
continue
if key == "image":
path = value
elif key == "op":
op, args = OPERATIONS[value]
need_values = args
to_do.append([op])
# Start the web response
start_response('200 OK', [('Content-Type', 'image/jpeg')])
img = load_remote_image(path)
for action in to_do:
func = action.pop(0)
img = func(img, *action)
return img.tostring('jpeg', img.mode)
if __name__ == "__main__":
import sys
if len(sys.argv) == 2:
qs = urlparse.parse_qsl(urlparse.urlparse(sys.argv[-1]).query)
print "{0}&sig={1}".format(sys.argv[-1], generate_sig(qs))
sys.exit(0)
from flup.server.fcgi_fork import WSGIServer
WSGIServer(thumbnailer_app, debug=True, maxSpare=1).run()
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