openmedialibrary/oml/utils.py
2014-05-21 02:02:21 +02:00

166 lines
4.1 KiB
Python

# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4
from __future__ import division
import os
import Image
from StringIO import StringIO
import re
import stdnum.isbn
import socket
import cStringIO
import gzip
import time
from datetime import datetime
import ox
import ed25519
from meta.utils import normalize_isbn, find_isbns
import logging
logger = logging.getLogger('oml.utils')
ENCODING='base64'
def valid_olid(id):
return id.startswith('OL') and id.endswith('M')
def get_positions(ids, pos):
'''
>>> get_positions([1,2,3,4], [2,4])
{2: 1, 4: 3}
'''
positions = {}
for i in pos:
try:
positions[i] = ids.index(i)
except:
pass
return positions
def get_by_key(objects, key, value):
obj = filter(lambda o: o.get(key) == value, objects)
return obj and obj[0] or None
def get_by_id(objects, id):
return get_by_key(objects, 'id', id)
def resize_image(data, width=None, size=None):
source = Image.open(StringIO(data))
if source.mode == 'P':
source = source.convert('RGB')
source_width = source.size[0]
source_height = source.size[1]
if size:
if source_width > source_height:
width = size
height = int(width / (float(source_width) / source_height))
height = height - height % 2
else:
height = size
width = int(height * (float(source_width) / source_height))
width = width - width % 2
else:
height = int(width / (float(source_width) / source_height))
height = height - height % 2
width = max(width, 1)
height = max(height, 1)
if width < source_width:
resize_method = Image.ANTIALIAS
else:
resize_method = Image.BICUBIC
output = source.resize((width, height), resize_method)
o = StringIO()
output.save(o, format='jpeg')
data = o.getvalue()
o.close()
return data
def sort_title(title):
title = title.replace(u'Æ', 'Ae')
if isinstance(title, str):
title = unicode(title)
title = ox.sort_string(title)
#title
title = re.sub(u'[\'!¿¡,\.;\-"\:\*\[\]]', '', title)
return title.strip()
def get_position_by_id(list, key):
for i in range(0, len(list)):
if list[i]['id'] == key:
return i
return -1
def valid(key, value, sig):
'''
validate that value was signed by key
'''
vk = ed25519.VerifyingKey(str(key), encoding=ENCODING)
try:
vk.verify(str(sig), str(value), encoding=ENCODING)
#except ed25519.BadSignatureError:
except:
return False
return True
def get_public_ipv6():
try:
host = ('2a01:4f8:120:3201::3', 25519)
s = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
s.settimeout(1)
s.connect(host)
ip = s.getsockname()[0]
s.close()
except:
ip = None
return ip
def update_dict(root, data):
for key in data:
keys = map(lambda part: part.replace('\0', '\\.'), key.replace('\\.', '\0').split('.'))
value = data[key]
p = root
while len(keys)>1:
key = keys.pop(0)
if isinstance(p, list):
p = p[get_position_by_id(p, key)]
else:
if key not in p:
p[key] = {}
p = p[key]
if value == None and keys[0] in p:
del p[keys[0]]
else:
p[keys[0]] = value
def remove_empty_folders(prefix):
empty = []
for root, folders, files in os.walk(prefix):
if not folders and not files:
empty.append(root)
for folder in empty:
remove_empty_tree(folder)
def remove_empty_tree(leaf):
while leaf:
if not os.path.exists(leaf):
leaf = os.path.dirname(leaf)
elif os.path.isdir(leaf) and not os.listdir(leaf):
logger.debug('rmdir %s', leaf)
os.rmdir(leaf)
else:
break
utc_0 = int(time.mktime(datetime(1970, 01, 01).timetuple()))
def datetime2ts(dt):
return int(time.mktime(dt.utctimetuple())) - utc_0
def ts2datetime(ts):
return datetime.utcfromtimestamp(float(ts))