openmedialibrary/oml/utils.py
2016-01-16 10:50:49 +05:30

400 lines
13 KiB
Python

# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4
import os
import sys
from PIL import Image
from io import StringIO, BytesIO
import re
import stdnum.isbn
import socket
import io
import gzip
import time
import hashlib
from datetime import datetime
import subprocess
import base64
import ox
import ed25519
from OpenSSL.crypto import (
load_privatekey, load_certificate,
dump_privatekey, dump_certificate,
FILETYPE_ASN1, FILETYPE_PEM, PKey, TYPE_RSA,
X509, X509Extension
)
from Crypto.PublicKey import RSA
from Crypto.Util.asn1 import DerSequence
from meta.utils import normalize_isbn, find_isbns, get_language, to_isbn13
import logging
logger = logging.getLogger(__name__)
ENCODING='base64'
def cleanup_id(key, value):
if key == 'isbn':
value = normalize_isbn(value)
if key in ('lccn', 'olid', 'oclc'):
value = ''.join([v for v in value if v!='-'])
return value
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 = [o for o in objects if o.get(key) == value]
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):
if isinstance(data, bytes):
data = BytesIO(data)
else:
data = StringIO(data)
source = Image.open(data)
if source.mode not in ('1', 'CMYK', 'L', 'RGB', 'RGBA', 'RGBX', 'YCbCr'):
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 = BytesIO()
output.save(o, format='jpeg')
data = o.getvalue()
o.close()
return data
def sort_title(title):
title = title.replace('Æ', 'Ae')
if isinstance(title, str):
title = str(title)
title = ox.sort_string(title)
#title
title = re.sub('[\'!¿¡,\.;\-"\:\*\[\]]', '', 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
'''
if isinstance(sig, str):
sig = sig.encode()
if isinstance(value, str):
value = value.encode()
if isinstance(key, str):
key = key.encode()
vk = ed25519.VerifyingKey(key, encoding=ENCODING)
try:
vk.verify(sig, value, encoding=ENCODING)
#except ed25519.BadSignatureError:
except:
return False
return True
def get_user_id(private_key, cert_path):
if os.path.exists(private_key):
with open(private_key) as fd:
key = load_privatekey(FILETYPE_PEM, fd.read())
if key.bits() != 1024:
os.unlink(private_key)
else:
user_id = get_service_id(private_key)
if not os.path.exists(private_key):
if os.path.exists(cert_path):
os.unlink(cert_path)
folder = os.path.dirname(private_key)
if not os.path.exists(folder):
os.makedirs(folder)
os.chmod(folder, 0o700)
key = PKey()
key.generate_key(TYPE_RSA, 1024)
with open(private_key, 'wb') as fd:
os.chmod(private_key, 0o600)
fd.write(dump_privatekey(FILETYPE_PEM, key))
os.chmod(private_key, 0o400)
user_id = get_service_id(private_key)
if not os.path.exists(cert_path):
ca = X509()
ca.set_version(2)
ca.set_serial_number(1)
ca.get_subject().CN = user_id
ca.gmtime_adj_notBefore(0)
ca.gmtime_adj_notAfter(24 * 60 * 60)
ca.set_issuer(ca.get_subject())
ca.set_pubkey(key)
ca.add_extensions([
X509Extension(b"basicConstraints", True, b"CA:TRUE, pathlen:0"),
X509Extension(b"nsCertType", True, b"sslCA"),
X509Extension(b"extendedKeyUsage", True,
b"serverAuth,clientAuth,emailProtection,timeStamping,msCodeInd,msCodeCom,msCTLSign,msSGC,msEFS,nsSGC"),
X509Extension(b"keyUsage", False, b"keyCertSign, cRLSign"),
X509Extension(b"subjectKeyIdentifier", False, b"hash", subject=ca),
])
ca.sign(key, "sha256")
with open(cert_path, 'wb') as fd:
fd.write(dump_certificate(FILETYPE_PEM, ca))
return user_id
def get_service_id(private_key_file=None, cert=None):
'''
service_id is the first half of the sha1 of the rsa public key encoded in base32
'''
if private_key_file:
with open(private_key_file, 'rb') as fd:
private_key = fd.read()
public_key = RSA.importKey(private_key).publickey().exportKey('DER')[22:]
# compute sha1 of public key and encode first half in base32
service_id = base64.b32encode(hashlib.sha1(public_key).digest()[:10]).lower().decode()
'''
# compute public key from priate key and export in DER format
# ignoring the SPKI header(22 bytes)
key = load_privatekey(FILETYPE_PEM, private_key)
cert = X509()
cert.set_pubkey(key)
public_key = dump_privatekey(FILETYPE_ASN1, cert.get_pubkey())[22:]
# compute sha1 of public key and encode first half in base32
service_id = base64.b32encode(hashlib.sha1(public_key).digest()[:10]).lower().decode()
'''
elif cert:
# compute sha1 of public key and encode first half in base32
key = load_certificate(FILETYPE_ASN1, cert).get_pubkey()
pub_der = DerSequence()
pub_der.decode(dump_privatekey(FILETYPE_ASN1, key))
public_key = RSA.construct((pub_der._seq[1], pub_der._seq[2])).exportKey('DER')[22:]
service_id = base64.b32encode(hashlib.sha1(public_key).digest()[:10]).lower().decode()
return service_id
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 get_interface():
interface = ''
if sys.platform == 'darwin' or sys.platform.startswith('freebsd'):
#cmd = ['/usr/sbin/netstat', '-rn']
cmd = ['/sbin/route', '-n', 'get', 'default']
p = subprocess.Popen(cmd, stdout=subprocess.PIPE, close_fds=True)
stdout, stderr = p.communicate()
stdout = stdout.decode('utf-8')
interface = [[p.strip() for p in s.split(':', 1)]
for s in stdout.strip().split('\n') if 'interface' in s]
if interface:
interface = '%%%s' % interface[0][1]
else:
interface = ''
return interface
def get_local_ipv4():
ip = None
if sys.platform == 'darwin' or sys.platform.startswith('freebsd'):
cmd = ['/sbin/route', '-n', 'get', 'default']
p = subprocess.Popen(cmd, stdout=subprocess.PIPE, close_fds=True)
stdout, stderr = p.communicate()
stdout = stdout.decode('utf-8')
interface = [[p.strip() for p in s.split(':', 1)]
for s in stdout.strip().split('\n') if 'interface' in s]
if interface:
interface = interface[0][1]
cmd = ['ifconfig', interface]
p = subprocess.Popen(cmd, stdout=subprocess.PIPE, close_fds=True)
stdout, stderr = p.communicate()
stdout = stdout.decode('utf-8')
ips = [l for l in stdout.split('\n') if 'inet ' in l]
if ips:
ip = ips[0].strip().split(' ')[1]
else:
cmd = ['ip', 'route', 'show']
p = subprocess.Popen(cmd, stdout=subprocess.PIPE, close_fds=True)
stdout, stderr = p.communicate()
stdout = stdout.decode('utf-8')
local = [l for l in stdout.split('\n') if 'default' in l]
if local:
dev = local[0].split(' ')[4]
local_ip = [l for l in stdout.split('\n')
if dev in l and not 'default' in l and 'src' in l]
if local_ip:
local_ip = [p for p in local_ip[0].split(' ')[1:] if '.' in p]
if local_ip:
ip = local_ip[0]
if not ip:
cmd = ['ip', 'addr', 'show']
p = subprocess.Popen(cmd, stdout=subprocess.PIPE, close_fds=True)
stdout, stderr = p.communicate()
stdout = stdout.decode('utf-8')
parts = stdout.split(' ')
local_ip = [p for p in parts if dev in p]
if local_ip:
local_ip = re.compile('inet (\d+\.\d+\.\d+.\d+)').findall(local_ip[0])
if local_ip:
ip = local_ip[0]
if not ip:
try:
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.connect(("8.8.8.8", 53))
return s.getsockname()[0]
except:
pass
return ip
def update_dict(root, data):
for key in data:
keys = [part.replace('\0', '.') for part in 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
if hasattr(root, '_save'):
root._save()
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, 1, 1).timetuple()))
def datetime2ts(dt):
return int(time.mktime(dt.utctimetuple())) - utc_0
def ts2datetime(ts):
return datetime.utcfromtimestamp(float(ts))
def run(*cmd):
p = subprocess.Popen(cmd, close_fds=True)
p.wait()
return p.returncode
def get(*cmd):
p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, close_fds=True)
stdout, error = p.communicate()
return stdout.decode()
def makefolder(path):
dirname = os.path.dirname(path)
if not os.path.exists(dirname):
os.makedirs(dirname)
def open_folder(folder=None, path=None):
cmd = []
if path and not folder:
folder = os.path.dirname(path)
if folder and not path:
path = folder
if sys.platform == 'darwin':
if folder and not path:
path = folder
cmd += ['open', '-R', path]
elif sys.platform.startswith('linux'):
cmd += ['xdg-open', folder]
else:
logger.debug('unsupported platform %s', sys.platform)
subprocess.Popen(cmd, close_fds=True)
def can_connect_dns(host="8.8.8.8", port=53):
"""
host: 8.8.8.8 (google-public-dns-a.google.com)
port: 53/tcp
"""
try:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.settimeout(1)
s.connect((host, port))
return True
except:
pass
return False
def _to_json(python_object):
if isinstance(python_object, datetime):
if python_object.year < 1900:
tt = python_object.timetuple()
return '%d-%02d-%02dT%02d:%02d%02dZ' % tuple(list(tt)[:6])
return python_object.strftime('%Y-%m-%dT%H:%M:%SZ')
raise TypeError(u'%s %s is not JSON serializable' % (repr(python_object), type(python_object)))
def get_ratio(data):
try:
img = Image.open(BytesIO(data))
return img.size[0]/img.size[1]
except:
return 1