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0bin/zerobin/paste.py

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# -*- coding: utf-8 -*-
import os
import hashlib
from datetime import datetime, timedelta
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from utils import settings
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class Paste(object):
"""
A paste objet to deal with the file opening/parsing/saving and the
calculation of the expiration date.
"""
DIR_CACHE = set()
DURATIONS = {
u'1_day': 24 * 3600,
u'1_month': 30 * 24 * 3600,
u'never': 365 * 24 * 3600 * 100,
}
def __init__(self, uuid=None, content=None,
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expiration=None):
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self.content = content
self.expiration = expiration
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if isinstance(self.content, unicode):
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self.content = self.content.encode('utf8')
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self.expiration = self.get_expiration(expiration)
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self.uuid = uuid or hashlib.sha1(self.content).hexdigest()
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def get_expiration(self, expiration):
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"""
Return a tuple with the date at which the Paste will expire
or if it should be destroyed after first reading.
Do not modify the value if it's already a date object or
if it's burn_after_reading
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"""
if (isinstance(expiration, datetime) or
'burn_after_reading' in str(expiration)):
return expiration
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try:
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return datetime.now() + timedelta(seconds=self.DURATIONS[expiration])
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except KeyError:
return u'burn_after_reading'
@classmethod
def build_path(cls, *dirs):
"""
Generic static content path builder. Return a path to
a location in the static content file dir.
"""
return os.path.join(settings.PASTE_FILES_ROOT, *dirs)
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@classmethod
def get_path(cls, uuid):
"""
Return the file path of a paste given uuid
"""
return cls.build_path(uuid[:2], uuid[2:4], uuid)
@property
def path(self):
"""
Return the file path for this path. Use get_path().
"""
return self.get_path(self.uuid)
@classmethod
def load_from_file(cls, path):
"""
Return an instance of the paste object with the content of the
given file.
"""
try:
paste = open(path)
uuid = os.path.basename(path)
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expiration = paste.next().strip()
content = paste.next().strip()
if "burn_after_reading" not in str(expiration):
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expiration = datetime.strptime(expiration, '%Y-%m-%d %H:%M:%S.%f')
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except StopIteration:
raise TypeError(u'File %s is malformed' % path)
except (IOError, OSError):
raise ValueError(u'Can not open paste from file %s' % path)
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return Paste(uuid=uuid, expiration=expiration, content=content)
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@classmethod
def load(cls, uuid):
"""
Return an instance of the paste object with the content of the
file matching this uuid. Use load_from_file() and get_path()
"""
return cls.load_from_file(cls.get_path(uuid))
def save(self):
"""
Save the content of this paste to a file.
"""
head, tail = self.uuid[:2], self.uuid[2:4]
# the static files are saved in project_dir/static/xx/yy/uuid
# xx and yy are generated from the uuid (see get_path())
# we need to check if they are created before writting
# but since we want to prevent to many writes, we create
# an in memory cache that will hold the result of this check fo
# each worker. If the dir is not in cache, we check the FS, and
# if the dir is not in there, we create the dir
if head not in self.DIR_CACHE:
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self.DIR_CACHE.add(head)
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if not os.path.isdir(self.build_path(head)):
os.makedirs(self.build_path(head, tail))
self.DIR_CACHE.add((head, tail))
elif (head, tail) not in self.DIR_CACHE:
path = self.build_path(head, tail)
self.DIR_CACHE.add((head, tail))
if not os.path.isdir(path):
os.mkdir(path)
# add a timestamp to burn after reading to allow
# a quick period of time where you can redirect to the page without
# deleting the paste
if self.expiration == "burn_after_reading":
self.expiration = self.expiration + '#%s' % datetime.now()
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# write the paste
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with open(self.path, 'w') as f:
f.write(unicode(self.expiration) + '\n')
f.write(self.content + '\n')
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return self
def delete(self):
"""
Delete the paste file.
"""
os.remove(self.path)
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