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import os
import hashlib
import exifread
from collections import namedtuple
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__)
class ExifWrapper(object):
ROTATED = (5, 6, 7, 8)
def __init__(self, exif_data):
self.exif_data = exif_data
@classmethod
def from_fp(cls, fp):
return cls(exifread.process_file(fp))
def _get_first_value(self, tag):
value = self.exif_data.get(tag)
if value and len(value.values) >= 1:
return value.values[0]
@property
def image_width(self):
return self._get_first_value('EXIF ExifImageWidth')
@property
def image_length(self):
return self._get_first_value('EXIF ExifImageLength')
@property
def is_rotated(self):
value = self._get_first_value('Image Orientation')
return value in self.ROTATED
class ImageWrapper(object):
_IMG_WIDTH = 0
_IMG_HEIGHT = 1
def __init__(self, filename, img, exif):
self.filename = filename
self.exif = exif
self.img = img
@classmethod
def from_fp(cls, fp):
img = Image.open(fp)
img.load()
fp.seek(0)
return cls(fp.name, img, ExifWrapper.from_fp(fp))
@property
def _width(self):
return float(self.img.size[self._IMG_WIDTH])
@property
def _height(self):
return float(self.img.size[self._IMG_HEIGHT])
@property
def is_landscape(self):
return self.width > self.height
@property
def height(self):
if self.exif.is_rotated:
return self._width
else:
return self._height
@property
def width(self):
if self.exif.is_rotated:
return self._height
else:
return self._width
def to_jpeg_data(self):
return self.img.tostring('jpeg', self.img.mode)
def content_type(self):
mt = wikiutil.MimeType(filename=self.filename)
return mt.content_type()
def crop(self, *args, **kwargs):
self.img = self.img.crop(*args, **kwargs)
def thumbnail(self, *args, **kwargs):
self.img.thumbnail(*args, **kwargs)
def grayscale(self):
self.img = ImageOps.grayscale(self.img)
def grayscale(img):
img.grayscale()
def crop(img, width, height):
src_ratio = float(img.width) / float(img.height)
dst_width, dst_height = int(width), int(height)
dst_ratio = float(dst_width) / float(dst_height)
if dst_ratio < src_ratio:
crop_height = img.height
crop_width = crop_height * dst_ratio
x_offset = float(img.width - crop_width) / 2
y_offset = 0
else:
crop_width = img.width
crop_height = crop_width / dst_ratio
x_offset = 0
y_offset = float(img.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)
if img.is_landscape:
width = (img.width / img.height) * long_side
height = long_side
else:
height = (img.height / img.width) * long_side
width = long_side
img.thumbnail((width, height), Image.ANTIALIAS)
return img
def thumbnail_constrain(img, size, dimension):
size = int(size)
if dimension.lower() == "h":
height, width = size, ((img.width * size) / img.height)
elif dimension.lower() == "w":
width, height = size, ((img.height * size) / img.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': grayscale,
'cr': crop,
'th': thumbnail,
'tc': thumbnail_constrain,
}
with open(fpath) as fp:
img = ImageWrapper.from_fp(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
request.headers['Content-Type'] = img.content_type()
data = img.to_jpeg_data()
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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