365 lines
10 KiB
Python
Executable file
365 lines
10 KiB
Python
Executable file
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""
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Copyright © 2020 Mia Herkt
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Licensed under the EUPL, Version 1.2 or - as soon as approved
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by the European Commission - subsequent versions of the EUPL
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(the "License");
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You may not use this work except in compliance with the License.
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You may obtain a copy of the license at:
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https://joinup.ec.europa.eu/software/page/eupl
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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either express or implied.
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See the License for the specific language governing permissions
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and limitations under the License.
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"""
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from flask import Flask, abort, make_response, redirect, request, send_from_directory, url_for, Response, render_template
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from flask_sqlalchemy import SQLAlchemy
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from flask_migrate import Migrate
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from jinja2.exceptions import *
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from jinja2 import ChoiceLoader, FileSystemLoader
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from hashlib import sha256
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from magic import Magic
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from mimetypes import guess_extension
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import sys
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import requests
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from validators import url as url_valid
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from pathlib import Path
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app = Flask(__name__, instance_relative_config=True)
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app.config.update(
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SQLALCHEMY_TRACK_MODIFICATIONS = False,
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PREFERRED_URL_SCHEME = "https", # nginx users: make sure to have 'uwsgi_param UWSGI_SCHEME $scheme;' in your config
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MAX_CONTENT_LENGTH = 256 * 1024 * 1024,
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MAX_URL_LENGTH = 4096,
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USE_X_SENDFILE = False,
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FHOST_USE_X_ACCEL_REDIRECT = True, # expect nginx by default
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FHOST_STORAGE_PATH = "up",
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FHOST_MAX_EXT_LENGTH = 9,
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FHOST_EXT_OVERRIDE = {
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"audio/flac" : ".flac",
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"image/gif" : ".gif",
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"image/jpeg" : ".jpg",
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"image/png" : ".png",
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"image/svg+xml" : ".svg",
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"video/webm" : ".webm",
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"video/x-matroska" : ".mkv",
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"application/octet-stream" : ".bin",
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"text/plain" : ".log",
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"text/plain" : ".txt",
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"text/x-diff" : ".diff",
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},
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FHOST_MIME_BLACKLIST = [
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"application/x-dosexec",
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"application/java-archive",
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"application/java-vm"
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],
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FHOST_UPLOAD_BLACKLIST = None,
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NSFW_DETECT = False,
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NSFW_THRESHOLD = 0.608,
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URL_ALPHABET = "DEQhd2uFteibPwq0SWBInTpA_jcZL5GKz3YCR14Ulk87Jors9vNHgfaOmMXy6Vx-",
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)
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if not app.config["TESTING"]:
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app.config.from_pyfile("config.py")
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app.jinja_loader = ChoiceLoader([
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FileSystemLoader(str(Path(app.instance_path) / "templates")),
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app.jinja_loader
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])
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if app.config["DEBUG"]:
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app.config["FHOST_USE_X_ACCEL_REDIRECT"] = False
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if app.config["NSFW_DETECT"]:
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from nsfw_detect import NSFWDetector
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nsfw = NSFWDetector()
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try:
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mimedetect = Magic(mime=True, mime_encoding=False)
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except:
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print("""Error: You have installed the wrong version of the 'magic' module.
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Please install python-magic.""")
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sys.exit(1)
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db = SQLAlchemy(app)
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migrate = Migrate(app, db)
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class URL(db.Model):
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id = db.Column(db.Integer, primary_key = True)
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url = db.Column(db.UnicodeText, unique = True)
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def __init__(self, url):
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self.url = url
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def getname(self):
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return su.enbase(self.id, 1)
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def geturl(self):
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return url_for("get", path=self.getname(), _external=True) + "\n"
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def get(url):
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u = URL.query.filter_by(url=url).first()
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if not u:
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u = URL(url)
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db.session.add(u)
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db.session.commit()
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return u
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class File(db.Model):
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id = db.Column(db.Integer, primary_key = True)
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sha256 = db.Column(db.String, unique = True)
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ext = db.Column(db.UnicodeText)
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mime = db.Column(db.UnicodeText)
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addr = db.Column(db.UnicodeText)
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removed = db.Column(db.Boolean, default=False)
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nsfw_score = db.Column(db.Float)
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def __init__(self, sha256, ext, mime, addr):
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self.sha256 = sha256
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self.ext = ext
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self.mime = mime
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self.addr = addr
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def getname(self):
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return u"{0}{1}".format(su.enbase(self.id, 1), self.ext)
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def geturl(self):
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n = self.getname()
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if self.nsfw_score and self.nsfw_score > app.config["NSFW_THRESHOLD"]:
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return url_for("get", path=n, _external=True, _anchor="nsfw") + "\n"
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else:
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return url_for("get", path=n, _external=True) + "\n"
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def store(file_, addr):
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data = file_.stream.read()
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digest = sha256(data).hexdigest()
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def get_mime():
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guess = mimedetect.from_buffer(data)
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app.logger.debug(f"MIME - specified: '{file_.content_type}' - detected: '{guess}'")
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if not file_.content_type or not "/" in file_.content_type or file_.content_type == "application/octet-stream":
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mime = guess
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else:
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mime = file_.content_type
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if mime in app.config["FHOST_MIME_BLACKLIST"] or guess in app.config["FHOST_MIME_BLACKLIST"]:
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abort(415)
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if mime.startswith("text/") and not "charset" in mime:
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mime += "; charset=utf-8"
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return mime
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def get_ext(mime):
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ext = "".join(Path(file_.filename).suffixes[-2:])
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gmime = mime[:mime.find(";")]
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guess = guess_extension(gmime)
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app.logger.debug(f"extension - specified: '{ext}' - detected: '{guess}'")
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if not ext:
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if gmime in app.config["FHOST_EXT_OVERRIDE"]:
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ext = app.config["FHOST_EXT_OVERRIDE"][gmime]
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else:
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ext = guess_extension(gmime)
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return ext[:app.config["FHOST_MAX_EXT_LENGTH"]] or ".bin"
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f = File.query.filter_by(sha256=digest).first()
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if f:
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if f.removed:
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abort(451)
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else:
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mime = get_mime()
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ext = get_ext(mime)
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f = File(digest, ext, mime, addr)
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f.addr = addr
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storage = Path(app.config["FHOST_STORAGE_PATH"])
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storage.mkdir(parents=True, exist_ok=True)
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p = storage / digest
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if not p.is_file():
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file_.stream.seek(0)
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file_.save(p)
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else:
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p.touch()
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if not f.nsfw_score and app.config["NSFW_DETECT"]:
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f.nsfw_score = nsfw.detect(p)
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db.session.add(f)
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db.session.commit()
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return f
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class UrlEncoder(object):
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def __init__(self,alphabet):
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self.alphabet = alphabet
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def enbase(self, x, min_length):
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n = len(self.alphabet)
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str = ""
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while x > 0:
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str = (self.alphabet[int(x % n)]) + str
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x = int(x // n)
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padding = self.alphabet[0] * (min_length - len(str))
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return '%s%s' % (padding, str)
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def debase(self, x):
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n = len(self.alphabet)
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result = 0
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for i, c in enumerate(reversed(x)):
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result += self.alphabet.index(c) * (n ** i)
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return result
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su = UrlEncoder(alphabet=app.config["URL_ALPHABET"])
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def fhost_url(scheme=None):
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if not scheme:
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return url_for(".fhost", _external=True).rstrip("/")
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else:
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return url_for(".fhost", _external=True, _scheme=scheme).rstrip("/")
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def is_fhost_url(url):
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return url.startswith(fhost_url()) or url.startswith(fhost_url("https"))
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def shorten(url):
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if len(url) > app.config["MAX_URL_LENGTH"]:
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abort(414)
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if not url_valid(url) or is_fhost_url(url) or "\n" in url:
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abort(400)
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u = URL.get(url)
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return u.geturl()
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def in_upload_bl(addr):
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if app.config["FHOST_UPLOAD_BLACKLIST"]:
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with app.open_instance_resource(app.config["FHOST_UPLOAD_BLACKLIST"]) as bl:
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check = addr.lstrip("::ffff:")
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for l in bl.readlines():
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if not l.startswith("#"):
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if check == l.rstrip():
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return True
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return False
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def store_file(f, addr):
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if in_upload_bl(addr):
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return "Your host is blocked from uploading files.\n", 451
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sf = File.store(f, addr)
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return sf.geturl()
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def store_url(url, addr):
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if is_fhost_url(url):
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abort(400)
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h = { "Accept-Encoding" : "identity" }
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r = requests.get(url, stream=True, verify=False, headers=h)
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try:
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r.raise_for_status()
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except requests.exceptions.HTTPError as e:
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return str(e) + "\n"
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if "content-length" in r.headers:
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l = int(r.headers["content-length"])
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if l < app.config["MAX_CONTENT_LENGTH"]:
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def urlfile(**kwargs):
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return type('',(),kwargs)()
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f = urlfile(stream=r.raw, content_type=r.headers["content-type"], filename="")
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return store_file(f, addr)
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else:
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abort(413)
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else:
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abort(411)
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@app.route("/<path:path>")
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def get(path):
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path = Path(path.split("/", 1)[0])
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sufs = "".join(path.suffixes[-2:])
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name = path.name[:-len(sufs) or None]
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id = su.debase(name)
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if sufs:
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f = File.query.get(id)
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if f and f.ext == sufs:
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if f.removed:
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abort(451)
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fpath = Path(app.config["FHOST_STORAGE_PATH"]) / f.sha256
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if not fpath.is_file():
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abort(404)
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if app.config["FHOST_USE_X_ACCEL_REDIRECT"]:
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response = make_response()
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response.headers["Content-Type"] = f.mime
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response.headers["Content-Length"] = fpath.stat().st_size
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response.headers["X-Accel-Redirect"] = "/" + str(fpath)
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return response
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else:
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return send_from_directory(app.config["FHOST_STORAGE_PATH"], f.sha256, mimetype = f.mime)
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else:
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u = URL.query.get(id)
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if u:
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return redirect(u.url)
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abort(404)
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@app.route("/", methods=["GET", "POST"])
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def fhost():
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if request.method == "POST":
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sf = None
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if "file" in request.files:
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return store_file(request.files["file"], request.remote_addr)
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elif "url" in request.form:
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return store_url(request.form["url"], request.remote_addr)
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elif "shorten" in request.form:
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return shorten(request.form["shorten"])
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abort(400)
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else:
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return render_template("index.html")
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@app.route("/robots.txt")
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def robots():
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return """User-agent: *
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Disallow: /
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"""
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@app.errorhandler(400)
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@app.errorhandler(404)
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@app.errorhandler(411)
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@app.errorhandler(413)
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@app.errorhandler(414)
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@app.errorhandler(415)
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@app.errorhandler(451)
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def ehandler(e):
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try:
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return render_template(f"{e.code}.html", id=id), e.code
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except TemplateNotFound:
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return "Segmentation fault\n", e.code
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