mirror of https://github.com/Tygs/0bin.git
271 lines
8.4 KiB
Python
271 lines
8.4 KiB
Python
import os
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import hashlib
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import base64
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import lockfile
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import json
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from datetime import datetime, timedelta
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import bleach
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from zerobin.utils import settings
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class Paste(object):
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"""
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A paste object to deal with the file opening/parsing/saving and the
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calculation of the expiration date.
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"""
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DIR_CACHE: set = set()
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DURATIONS = {
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"1_day": 24 * 3600,
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"1_month": 30 * 24 * 3600,
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"never": 365 * 24 * 3600 * 100,
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}
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def __init__(
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self,
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uuid=None,
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uuid_length=None,
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content=None,
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expiration=None,
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title="",
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btc_tip_address="",
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):
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self.content = content
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self.expiration = self.get_expiration(expiration)
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self.title = bleach.clean(title, strip=True)[:60]
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self.btc_tip_address = bleach.clean(btc_tip_address, strip=True)[:50]
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if not uuid:
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# generate the uuid from the decoded content by hashing it
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# and turning it into base64, with some characters strippped
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uuid = hashlib.sha1(self.content.encode("utf8"))
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uuid = base64.b64encode(uuid.digest()).decode()
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uuid = uuid.rstrip("=\n").replace("/", "-")
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if uuid_length:
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uuid = uuid[:uuid_length]
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self.uuid = uuid
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def get_expiration(self, expiration):
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"""
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Return a date at which the Paste will expire
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or if it should be destroyed after first reading.
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Do not modify the value if it's already a date object or
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if it's burn_after_reading
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"""
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try:
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return datetime.now() + timedelta(seconds=self.DURATIONS[expiration])
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except KeyError:
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return expiration
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@classmethod
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def build_path(cls, *dirs):
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"""
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Generic static content path builder. Return a path to
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a location in the static content file dir.
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"""
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return os.path.join(settings.PASTE_FILES_ROOT, *dirs)
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@classmethod
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def get_path(cls, uuid):
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"""
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Return the file path of a paste given uuid
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"""
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return cls.build_path(uuid[:2], uuid[2:4], uuid)
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@property
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def path(self):
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"""
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Return the file path for this path. Use get_path().
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"""
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return self.get_path(self.uuid)
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@property
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def owner_key(self):
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"""
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Return a key that gives you admin rights on this paste
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"""
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payload = (settings.SECRET_KEY + self.uuid).encode("ascii")
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return hashlib.sha256(payload).hexdigest()
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@classmethod
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def load_from_file(cls, path):
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"""
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Return an instance of the paste object with the content of the
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given file.
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"""
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try:
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with open(path) as paste:
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uuid = os.path.basename(path)
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expiration = next(paste).strip()
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content = next(paste).strip()
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try:
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metadata = json.loads(next(paste).strip())
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except (StopIteration, json.decoder.JSONDecodeError):
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metadata = {}
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if "burn_after_reading" not in expiration:
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expiration = datetime.strptime(expiration, "%Y-%m-%d %H:%M:%S.%f")
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except StopIteration:
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raise TypeError("File %s is malformed" % path)
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except (IOError, OSError):
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raise ValueError("Can not open paste from file %s" % path)
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return Paste(
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uuid=uuid,
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expiration=expiration,
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content=content,
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title=" ".join(metadata.get("title", "").split()),
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btc_tip_address=" ".join(metadata.get("btc_tip_address", "").split()),
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)
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@classmethod
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def load(cls, uuid):
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"""
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Return an instance of the paste object with the content of the
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file matching this uuid. Use load_from_file() and get_path()
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"""
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return cls.load_from_file(cls.get_path(uuid))
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def increment_counter(self):
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"""
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Increment pastes counter.
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It uses a lock file to prevent multi access to the file.
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"""
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path = settings.PASTE_FILES_ROOT
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counter_file = os.path.join(path, "counter")
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with lockfile.LockFile(counter_file):
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# Read the value from the counter
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try:
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with open(counter_file, "r") as fcounter:
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counter_value = int(fcounter.read(50)) + 1
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except (ValueError, IOError, OSError):
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counter_value = 1
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# write new value to counter
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with open(counter_file, "w") as fcounter:
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fcounter.write(str(counter_value))
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def save(self):
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"""
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Save the content of this paste to a file.
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"""
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head, tail = self.uuid[:2], self.uuid[2:4]
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# the static files are saved in project_dir/static/xx/yy/uuid
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# xx and yy are generated from the uuid (see get_path())
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# we need to check if they are created before writting
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# but since we want to prevent too many writes, we create
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# an in memory cache that will hold the result of this check for
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# each worker. If the dir is not in cache, we check the FS, and
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# if the dir is not in there, we create the dir
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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)):
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os.makedirs(self.build_path(head, tail))
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self.DIR_CACHE.add((head, tail))
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if (head, tail) not in self.DIR_CACHE:
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path = self.build_path(head, tail)
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self.DIR_CACHE.add((head, tail))
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if not os.path.isdir(path):
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os.mkdir(path)
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# add a timestamp to burn after reading to allow
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# a quick period of time where you can redirect to the page without
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# deleting the paste
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if "burn_after_reading" == self.expiration:
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expiration = self.expiration + "#%s" % datetime.now() # TODO: use UTC dates
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else:
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expiration = str(self.expiration)
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# write the paste
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with open(self.path, "w") as f:
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f.write(expiration + "\n")
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f.write(self.content + "\n")
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metadata = {}
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if self.title:
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metadata["title"] = self.title
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if self.btc_tip_address:
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metadata["btc_tip_address"] = self.btc_tip_address
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f.write(json.dumps(metadata) + "\n")
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return self
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@classmethod
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def get_pastes_count(cls):
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"""
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Return the number of created pastes.
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(must have option DISPLAY_COUNTER enabled for the pastes to be
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be counted)
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"""
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counter_file = os.path.join(settings.PASTE_FILES_ROOT, "counter")
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try:
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count = int(open(counter_file).read(50))
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except (IOError, OSError):
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count = 0
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return "{0:,}".format(count)
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@property
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def humanized_expiration(self):
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"""
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Return the expiration date in a human friendly format.
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In 3 minutes, or in 3 days or the 23/01/2102
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"""
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try:
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expiration = self.expiration - datetime.now()
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# in_seconds doesn't exist in python 2.6
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expiration = expiration.days * 24 * 60 * 60 + expiration.seconds
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except TypeError:
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return None
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if expiration < 60:
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return "in %s s" % expiration
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if expiration < 60 * 60:
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return "in %s m" % int(expiration / 60)
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if expiration < 60 * 60 * 24:
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return "in %s h" % int(expiration / (60 * 60))
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if expiration < 60 * 60 * 24 * 10:
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return "in %s days(s)" % int(expiration / (60 * 60 * 24))
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return "the %s" % self.expiration.strftime("%m/%d/%Y")
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def delete(self):
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"""
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Delete the paste file.
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"""
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os.remove(self.path)
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@classmethod
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def iter_all(cls, on_error=lambda e: e):
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for p in settings.PASTE_FILES_ROOT.rglob("*"):
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if p.is_file() and "counter" not in str(p):
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try:
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yield Paste.load_from_file(p)
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except (TypeError, ValueError) as e:
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on_error(e)
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@property
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def has_expired(self):
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try:
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return self.expiration < datetime.now()
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except TypeError:
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return False
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