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import os
import hashlib
from PIL import Image, ImageOps
from PIL.ImageFileIO import ImageFileIO
from MoinMoin import log
from MoinMoin import wikiutil
from MoinMoin.Page import Page
from MoinMoin.action import AttachFile
from MoinMoin.caching import CacheEntry
logging = log.getLogger(__name__)
def crop(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
return img.crop((
x_offset,
y_offset,
x_offset + int(crop_width),
y_offset + int(crop_height)
))
def thumbnail(img, long_side):
long_side = int(long_side)
width, height = [float(d) for d in img.size]
if height > width:
width = (width / height) * long_side
height = long_side
else:
height = (height / width) * long_side
width = long_side
img.thumbnail((width, height), Image.ANTIALIAS)
return img
def thumbnail_constrain(img, size, dimension):
size = int(size)
width, height = [float(d) for d in img.size]
if dimension.lower() == "h":
height, width = size, ((width * size) / height)
elif dimension.lower() == "w":
width, height = size, ((height * size) / width)
else:
raise Exception("Must contrain valid dimension")
img.thumbnail((int(width), int(height)), Image.ANTIALIAS)
return img
def get_cache_key(request, filename):
ops = hashlib.md5(":".join(request.values.getlist("do")))
key = filename.split(".")
key.insert(0, "thumbnail")
key.insert(-1, ops.hexdigest()[:8])
return ".".join(key)
def execute(pagename, request):
_ = request.getText
if not request.user.may.read(pagename):
return _('You are not allowed to view attachments of this page.')
page = Page(request, pagename)
pagename, filename, fpath = AttachFile._access_file(pagename, request)
if not filename:
request.status_code = 404
return
cache = CacheEntry(request, page,
get_cache_key(request, filename), scope="item")
if cache.exists() and (cache.mtime() >= os.path.getmtime(fpath)):
logging.info("Using cache for %s", fpath)
cache.open(mode="r")
request.write(cache.read())
cache.close()
return
action_map = {
'ds': ImageOps.grayscale,
'cr': crop,
'th': thumbnail,
'tc': thumbnail_constrain,
}
with open(fpath) as fp:
img = Image.open(fp)
for action in request.values.getlist("do"):
action = action.split(":")
args = action[1].split(",") if len(action) > 1 else []
try:
img = action_map[action[0]](img, *args)
except Exception, e:
request.status_code = 400
request.write("Error: {}".format(e))
return
mt = wikiutil.MimeType(filename=filename)
request.headers['Content-Type'] = mt.content_type()
data = img.tostring('jpeg', img.mode)
try:
cache.lock("w")
cache.open(mode="w")
cache.write(data)
cache.close()
except Exception, e:
request.status_code = 500
request.write("Error: {}".format(e))
return
finally:
cache.unlock()
request.write(data)
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