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# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
# Pictures collection implementation
from StringIO import StringIO
try:
from PIL import Image
except:
Image = None
from base64 import b64encode, b64decode
from urllib import urlopen
from util import *
from atomutil import *
from sys import debug
# Convert a particular user id to a picture id
def pictureid(id):
return ('accounts', id, 'user.picture')
# Convert image to a 50x50 PNG image
def to50x50png(url):
debug('pictures.py::to50x50png::url', url)
if Image is None:
return url
img = Image.open(StringIO(b64decode(url.split(',')[1])) if url.startswith('data:') else StringIO(urlopen(url).read()))
t = img.resize((50, 50))
obuf = StringIO()
t.save(obuf, 'PNG')
return 'data:image/png;base64,' + b64encode(obuf.getvalue()).replace('\n', '')
# Update the user's picture
def put(id, picture, user, cache):
debug('pictures.py::put::id', id)
debug('pictures.py::put::picture', picture)
picid = user.get(()) if isNull(id) else car(id)
# Only the admin can update other user's pictures
if picid != user.get(()) and user.get(()) != 'admin':
debug('pictures.py::put', 'not owner or admin', user.get(()))
return False
# Get image and token from input picture
def image(c):
img = assoc("'image", c)
return None if isNull(img) else to50x50png(cadr(img))
def token(c):
tok = assoc("'token", c)
return None if isNull(tok) else cadr(tok)
img = image(content(picture))
tok = token(content(picture))
# Update the picture
# Put with an upload token
if not isNull(tok):
debug('pictures.py::put::token', tok)
# Token alone, store token with existing image, if any
if isNull(img):
epicture = cache.get(pictureid(picid))
eimg = None if isNull(epicture) else image(content(epicture))
if isNull(eimg):
picentry = mkentry(title(picture), picid, picid, now(), ("'picture", ("'token", tok)))
debug('pictures.py::put::picentry', picentry)
return cache.put(pictureid(picid), picentry)
debug('pictures.py::put::eimg', eimg)
picentry = mkentry(title(picture), picid, picid, now(), ("'picture", ("'image", eimg), ("'token", tok)))
debug('pictures.py::put::picentry', picentry)
return cache.put(pictureid(picid), picentry)
# Token plus image, put image if token is valid, removing the token
debug('pictures.py::put::img', img)
epicture = cache.get(pictureid(picid))
etok = None if isNull(epicture) else token(content(epicture))
debug('pictures.py::put::etok', etok)
if isNull(etok) or tok != etok:
debug('pictures.py::put', 'invalid token', tok)
return False
picentry = mkentry(title(picture), picid, picid, now(), ("'picture", ("'image", img)))
debug('pictures.py::put::picentry', picentry)
return cache.put(pictureid(picid), picentry)
# Update picture image
if not isNull(img):
debug('pictures.py::put::img', img)
picentry = mkentry(title(picture), picid, picid, now(), ("'picture", ("'image", img)))
debug('pictures.py::put::picentry', picentry)
return cache.put(pictureid(picid), picentry)
# Put default empty picture
picentry = mkentry(title(picture), picid, picid, now(), ())
debug('pictures.py::put::picentry', picentry)
return cache.put(pictureid(picid), picentry)
# Get a user's picture
def get(id, user, cache):
debug('pictures.py::get::id', id)
# Get the requested picture
picid = user.get(()) if isNull(id) else car(id)
picture = cache.get(pictureid(picid))
if isNull(picture):
return mkentry(picid, picid, picid, now(), ())
# Get image and token from picture
def image(c):
img = assoc("'image", c)
return None if isNull(img) else cadr(img)
def token(c):
tok = assoc("'token", c)
return None if isNull(tok) else cadr(tok)
img = image(content(picture))
tok = token(content(picture))
# Return the picture
picc = (() if isNull(img) else (("'image", img),)) + (() if isNull(tok) or (user.get(()) != author(picture) and user.get(()) != 'admin') else (("'token", tok),))
if isNull(picc):
picentry = mkentry(title(picture), picid, author(picture), updated(picture), ())
debug('pictures.py::get::picentry', picentry)
return picentry
picentry = mkentry(title(picture), picid, author(picture), updated(picture), ("'picture",) + picc)
debug('pictures.py::get::picentry', picentry)
return picentry
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