init

11 files changed, 711 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..64799da
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+__pycache__/
+.py[cod]
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..7f1b81d
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,13 @@
+Copyright © 2016, Martin Herkt <lachs0r@srsfckn.biz>
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or  without fee is hereby granted,  provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES OF
+MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL,  DIRECT,  INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING  FROM LOSS OF USE,  DATA OR PROFITS,  WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
diff --git a/README.rst b/README.rst
new file mode 100644
index 0000000..ca5ba46
--- /dev/null
+++ b/README.rst
@@ -0,0 +1,54 @@
+The Null Pointer
+================
+
+This is a no-bullshit file hosting and URL shortening service that also runs
+`0x0.st <https://0x0.st>`_. Use with uWSGI.
+
+If you are running nginx, you should use the ``X-Accel-Redirect`` header.
+To make it work, include this in your nginx config’s ``server`` block::
+
+    location /up {
+        internal;
+    }
+
+where ``/up`` is whatever you’ve configured as ``FHOST_STORAGE_PATH``
+in ``fhost.py``.
+
+For all other servers, set ``FHOST_USE_X_ACCEL_REDIRECT`` to ``False`` and
+``USE_X_SENDFILE`` to ``True``, assuming your server supports this.
+Otherwise, Flask will serve the file with chunked encoding, which sucks and
+should be avoided at all costs.
+
+To make files expire, simply create a cronjob that runs ``cleanup.py`` every
+now and then.
+
+Before running the service for the first time, run ``./fhost.py db upgrade``.
+
+
+FAQ
+---
+
+Q:
+    Will you ever add a web interface with HTML forms?
+A:
+    No. This would without a doubt make it very popular and quickly exceed
+    my hosting budget unless I started crippling it.
+
+Q:
+    What about file management? Will I be able to register an account at some
+    point?
+A:
+    No.
+
+Q:
+    Why are you storing IP addresses with each uploaded file?
+A:
+    This is done to make dealing with legal claims and accidental uploads
+    easier, e.g. when a user requests removal of all text files uploaded from
+    a certain address within a given time frame (it happens).
+
+Q:
+    Do you accept donations?
+A:
+    Only if you insist. I’ve spent very little time and effort on this service
+    and I don’t feel like I should be taking money for it.
diff --git a/cleanup.py b/cleanup.py
new file mode 100755
index 0000000..401140a
--- /dev/null
+++ b/cleanup.py
@@ -0,0 +1,23 @@
+#!/usr/bin/env python3
+
+import os, sys, time, datetime
+from fhost import app
+
+os.chdir(os.path.dirname(sys.argv[0]))
+os.chdir(app.config["FHOST_STORAGE_PATH"])
+
+files = [f for f in os.listdir(".")]
+
+maxs = app.config["MAX_CONTENT_LENGTH"]
+mind = 30
+maxd = 365
+
+for f in files:
+    stat = os.stat(f)
+    systime = time.time()
+    age = datetime.timedelta(seconds = systime - stat.st_mtime).days
+
+    maxage = mind + (-maxd + mind) * (stat.st_size / maxs - 1) ** 3
+
+    if age >= maxage:
+        os.remove(f)
diff --git a/fhost.py b/fhost.py
new file mode 100755
index 0000000..1b9a4c7
--- /dev/null
+++ b/fhost.py
@@ -0,0 +1,402 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+from flask import Flask, abort, escape, make_response, redirect, request, send_from_directory, url_for
+from flask_sqlalchemy import SQLAlchemy
+from flask_script import Manager
+from flask_migrate import Migrate, MigrateCommand
+from hashlib import sha256
+from humanize import naturalsize
+from magic import Magic
+from mimetypes import guess_extension
+import os, sys
+import requests
+from short_url import UrlEncoder
+from validators import url as url_valid
+
+app = Flask(__name__)
+app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False
+
+app.config["SQLALCHEMY_DATABASE_URI"] = "sqlite:///db.sqlite" # "postgresql://0x0@/0x0"
+app.config["PREFERRED_URL_SCHEME"] = "https" # nginx users: make sure to have 'uwsgi_param UWSGI_SCHEME $scheme;' in your config
+app.config["MAX_CONTENT_LENGTH"] = 256 * 1024 * 1024
+app.config["MAX_URL_LENGTH"] = 4096
+app.config["FHOST_STORAGE_PATH"] = "up"
+app.config["FHOST_USE_X_ACCEL_REDIRECT"] = True # expect nginx by default
+app.config["USE_X_SENDFILE"] = False
+app.config["FHOST_EXT_OVERRIDE"] = {
+    "image/gif" : ".gif",
+    "image/jpeg" : ".jpg",
+    "image/png" : ".png",
+    "image/svg+xml" : ".svg",
+    "video/webm" : ".webm",
+    "video/x-matroska" : ".mkv",
+    "application/octet-stream" : ".bin",
+    "text/plain" : ".txt"
+}
+
+# default blacklist to avoid AV mafia extortion
+app.config["FHOST_MIME_BLACKLIST"] = [
+    "application/x-dosexec",
+    "application/java-archive",
+    "application/java-vm"
+]
+
+try:
+    mimedetect = Magic(mime=True, mime_encoding=False)
+except:
+    print("""Error: You have installed the wrong version of the 'magic' module.
+Please install python-magic.""")
+    sys.exit(1)
+
+if not os.path.exists(app.config["FHOST_STORAGE_PATH"]):
+    os.mkdir(app.config["FHOST_STORAGE_PATH"])
+
+db = SQLAlchemy(app)
+migrate = Migrate(app, db)
+
+manager = Manager(app)
+manager.add_command("db", MigrateCommand)
+
+su = UrlEncoder(alphabet='DEQhd2uFteibPwq0SWBInTpA_jcZL5GKz3YCR14Ulk87Jors9vNHgfaOmMXy6Vx-', block_size=16)
+
+class URL(db.Model):
+    id = db.Column(db.Integer, primary_key = True)
+    url = db.Column(db.UnicodeText, unique = True)
+
+    def __init__(self, url):
+        self.url = url
+
+    def getname(self):
+        return su.enbase(self.id, 1)
+
+class File(db.Model):
+    id = db.Column(db.Integer, primary_key = True)
+    sha256 = db.Column(db.String, unique = True)
+    ext = db.Column(db.UnicodeText)
+    mime = db.Column(db.UnicodeText)
+    addr = db.Column(db.UnicodeText)
+    removed = db.Column(db.Boolean, default=False)
+
+    def __init__(self, sha256, ext, mime, addr):
+        self.sha256 = sha256
+        self.ext = ext
+        self.mime = mime
+        self.addr = addr
+
+    def getname(self):
+        return u"{0}{1}".format(su.enbase(self.id, 1), self.ext)
+
+
+def getpath(fn):
+    return os.path.join(app.config["FHOST_STORAGE_PATH"], fn)
+
+def geturl(p):
+    return url_for("get", path=p, _external=True) + "\n"
+
+def shorten(url):
+    if len(url) > app.config["MAX_URL_LENGTH"]:
+        abort(414)
+
+    if not url_valid(url):
+        abort(400)
+
+    existing = URL.query.filter_by(url=url).first()
+
+    if existing:
+        return geturl(existing.getname())
+    else:
+        u = URL(url)
+        db.session.add(u)
+        db.session.commit()
+
+        return geturl(u.getname())
+
+def store_file(f, addr):
+    data = f.stream.read()
+    digest = sha256(data).hexdigest()
+    existing = File.query.filter_by(sha256=digest).first()
+
+    if existing:
+        if existing.removed:
+            return legal()
+
+        epath = getpath(existing.sha256)
+
+        if not os.path.exists(epath):
+            with open(epath, "wb") as of:
+                of.write(data)
+
+        os.utime(epath, None)
+        existing.addr = addr
+        db.session.commit()
+
+        return geturl(existing.getname())
+    else:
+        guessmime = mimedetect.from_buffer(data)
+
+        if not f.content_type or not "/" in f.content_type or f.content_type == "application/octet-stream":
+            mime = guessmime
+        else:
+            mime = f.content_type
+
+        if mime in app.config["FHOST_MIME_BLACKLIST"] or guessmime in app.config["FHOST_MIME_BLACKLIST"]:
+            abort(415)
+
+        if mime.startswith("text/") and not "charset" in f.mime:
+            mime += "; charset=utf-8"
+
+        ext = os.path.splitext(f.filename)[1]
+
+        if not ext:
+            gmime = mime.split(";")[0]
+
+            if not gmime in app.config["FHOST_EXT_OVERRIDE"]:
+                ext = guess_extension(gmime)
+            else:
+                ext = app.config["FHOST_EXT_OVERRIDE"][gmime]
+        else:
+            ext = ext[:8]
+
+        if not ext:
+            ext = ".bin"
+
+        with open(getpath(digest), "wb") as of:
+            of.write(data)
+
+        sf = File(digest, ext, mime, addr)
+        db.session.add(sf)
+        db.session.commit()
+
+        return geturl(sf.getname())
+
+def store_url(url, addr):
+    fhost_url = url_for(".fhost", _external=True).rstrip("/")
+    fhost_url_https = url_for(".fhost", _external=True, _scheme="https").rstrip("/")
+
+    if url.startswith(fhost_url) or url.startswith(fhost_url_https):
+        return segfault(508)
+
+    r = requests.get(url, stream=True, verify=False)
+
+    try:
+        r.raise_for_status()
+    except (requests.exceptions.HTTPError, e):
+        return str(e) + "\n"
+
+    if "content-length" in r.headers:
+        l = int(r.headers["content-length"])
+
+        if l < app.config["MAX_CONTENT_LENGTH"]:
+            def urlfile(**kwargs):
+                return type('',(),kwargs)()
+
+            f = urlfile(stream=r.raw, content_type=r.headers["content-type"], filename="")
+
+            return store_file(f, addr)
+        else:
+            hl = naturalsize(l, binary = True)
+            hml = naturalsize(app.config["MAX_CONTENT_LENGTH"], binary=True)
+
+            return "Remote file too large ({0} > {1}).\n".format(hl, hml), 413
+    else:
+        return "Could not determine remote file size (no Content-Length in response header; shoot admin).\n", 411
+
+@app.route("/<path:path>")
+def get(path):
+    p = os.path.splitext(path)
+    id = su.debase(p[0])
+
+    if p[1]:
+        f = File.query.get(id)
+
+        if f and f.ext == p[1]:
+            if f.removed:
+                return legal()
+
+            fpath = getpath(f.sha256)
+
+            if not os.path.exists(fpath):
+                abort(404)
+
+            fsize = os.path.getsize(fpath)
+
+            if app.config["FHOST_USE_X_ACCEL_REDIRECT"]:
+                response = make_response()
+                response.headers["Content-Type"] = f.mime
+                response.headers["Content-Length"] = fsize
+                response.headers["X-Accel-Redirect"] = "/" + fpath
+                return response
+            else:
+                return send_from_directory(app.config["FHOST_STORAGE_PATH"], f.sha256, mimetype = f.mime)
+    else:
+        u = URL.query.get(id)
+
+        if u:
+            return redirect(u.url)
+
+    abort(404)
+
+@app.route("/", methods=["GET", "POST"])
+def fhost():
+    if request.method == "POST":
+        sf = None
+
+        if "file" in request.files:
+            return store_file(request.files["file"], request.remote_addr)
+        elif "url" in request.form:
+            return store_url(request.form["url"], request.remote_addr)
+        elif "shorten" in request.form:
+            return shorten(request.form["shorten"])
+
+        abort(400)
+    else:
+        fmts = list(app.config["FHOST_EXT_OVERRIDE"])
+        fmts.sort()
+        maxsize = naturalsize(app.config["MAX_CONTENT_LENGTH"], binary=True)
+        maxsizenum, maxsizeunit = maxsize.split(" ")
+        maxsizenum = float(maxsizenum)
+        maxsizehalf = maxsizenum / 2
+
+        if maxsizenum.is_integer():
+            maxsizenum = int(maxsizenum)
+        if maxsizehalf.is_integer():
+            maxsizehalf = int(maxsizehalf)
+
+        return """<pre>
+THE NULL POINTER
+================
+
+HTTP POST files here:
+    curl -F'file=@yourfile.png' {0}
+You can also POST remote URLs:
+    curl -F'url=http://example.com/image.jpg' {0}
+Or you can shorten URLs:
+    curl -F'shorten=http://example.com/some/long/url' {0}
+
+File URLs are valid for at least 30 days and up to a year (see below).
+Shortened URLs do not expire.
+
+Maximum file size: {1}
+Not allowed: {5}
+
+
+FILE RETENTION PERIOD
+---------------------
+
+retention = min_age + (-max_age + min_age) * pow((file_size / max_size - 1), 3)
+
+   days
+    365 |  \\
+        |   \\
+        |    \\
+        |     \\
+        |      \\
+        |       \\
+        |        ..
+        |          \\
+  197.5 | ----------..-------------------------------------------
+        |             ..
+        |               \\
+        |                ..
+        |                  ...
+        |                     ..
+        |                       ...
+        |                          ....
+        |                              ......
+     30 |                                    ....................
+          0{2}{3}
+           {4}
+
+
+ABUSE
+-----
+
+If you would like to request permanent deletion, please contact lachs0r via
+IRC on Freenode, or send an email to lachs0r@(this domain).
+
+Please allow up to 24 hours for a response.
+</pre>
+""".format(url_for(".fhost", _external=True).rstrip("/"),
+           maxsize, str(maxsizehalf).rjust(27), str(maxsizenum).rjust(27),
+           maxsizeunit.rjust(54),
+           ", ".join(app.config["FHOST_MIME_BLACKLIST"]))
+
+@app.route("/robots.txt")
+def robots():
+    return """User-agent: *
+Disallow: /
+"""
+
+def legal():
+    return "451 Unavailable For Legal Reasons\n", 451
+
+@app.errorhandler(400)
+@app.errorhandler(404)
+@app.errorhandler(414)
+@app.errorhandler(415)
+def segfault(e):
+    return "Segmentation fault\n", e.code
+
+@app.errorhandler(404)
+def notfound(e):
+    return u"""<pre>Process {0} stopped
+* thread #1: tid = {0}, {1:#018x}, name = '{2}'
+    frame #0:
+Process {0} stopped
+* thread #8: tid = {0}, {3:#018x} fhost`get(path='{4}') + 27 at fhost.c:139, name = 'fhost/responder', stop reason = invalid address (fault address: 0x30)
+    frame #0: {3:#018x} fhost`get(path='{4}') + 27 at fhost.c:139
+   136   get(SrvContext *ctx, const char *path)
+   137   {{
+   138       StoredObj *obj = ctx->store->query(shurl_debase(path));
+-> 139       switch (obj->type) {{
+   140           case ObjTypeFile:
+   141               ctx->serve_file_id(obj->id);
+   142               break;
+(lldb) q</pre>
+""".format(os.getpid(), id(app), "fhost", id(get), escape(request.path)), e.code
+
+@manager.command
+def debug():
+    app.config["FHOST_USE_X_ACCEL_REDIRECT"] = False
+    app.run(debug=True, port=4562,host="0.0.0.0")
+
+@manager.command
+def permadelete(name):
+    id = su.debase(name)
+    f = File.query.get(id)
+
+    if f:
+        if os.path.exists(getpath(f.sha256)):
+            os.remove(getpath(f.sha256))
+        f.removed = True
+        db.session.commit()
+
+@manager.command
+def query(name):
+    id = su.debase(name)
+    f = File.query.get(id)
+
+    if f:
+        print("url: {}".format(f.getname()))
+        vals = vars(f)
+
+        for v in vals:
+            if not v.startswith("_sa"):
+                print("{}: {}".format(v, vals[v]))
+
+@manager.command
+def queryhash(h):
+    f = File.query.filter_by(sha256=h).first()
+    if f:
+        query(su.enbase(f.id, 1))
+
+@manager.command
+def queryaddr(a):
+    res = File.query.filter_by(addr=a)
+
+    for f in res:
+        query(su.enbase(f.id, 1))
+
+if __name__ == "__main__":
+    manager.run()
diff --git a/migrations/README b/migrations/README
new file mode 100755
index 0000000..98e4f9c
--- /dev/null
+++ b/migrations/README
@@ -0,0 +1 @@
+Generic single-database configuration.
\ No newline at end of file
diff --git a/migrations/alembic.ini b/migrations/alembic.ini
new file mode 100644
index 0000000..f8ed480
--- /dev/null
+++ b/migrations/alembic.ini
@@ -0,0 +1,45 @@
+# A generic, single database configuration.
+
+[alembic]
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S
diff --git a/migrations/env.py b/migrations/env.py
new file mode 100755
index 0000000..4593816
--- /dev/null
+++ b/migrations/env.py
@@ -0,0 +1,87 @@
+from __future__ import with_statement
+from alembic import context
+from sqlalchemy import engine_from_config, pool
+from logging.config import fileConfig
+import logging
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+fileConfig(config.config_file_name)
+logger = logging.getLogger('alembic.env')
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+from flask import current_app
+config.set_main_option('sqlalchemy.url',
+                       current_app.config.get('SQLALCHEMY_DATABASE_URI'))
+target_metadata = current_app.extensions['migrate'].db.metadata
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+
+def run_migrations_offline():
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(url=url)
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online():
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+
+    # this callback is used to prevent an auto-migration from being generated
+    # when there are no changes to the schema
+    # reference: http://alembic.readthedocs.org/en/latest/cookbook.html
+    def process_revision_directives(context, revision, directives):
+        if getattr(config.cmd_opts, 'autogenerate', False):
+            script = directives[0]
+            if script.upgrade_ops.is_empty():
+                directives[:] = []
+                logger.info('No changes in schema detected.')
+
+    engine = engine_from_config(config.get_section(config.config_ini_section),
+                                prefix='sqlalchemy.',
+                                poolclass=pool.NullPool)
+
+    connection = engine.connect()
+    context.configure(connection=connection,
+                      target_metadata=target_metadata,
+                      process_revision_directives=process_revision_directives,
+                      **current_app.extensions['migrate'].configure_args)
+
+    try:
+        with context.begin_transaction():
+            context.run_migrations()
+    finally:
+        connection.close()
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()
diff --git a/migrations/script.py.mako b/migrations/script.py.mako
new file mode 100755
index 0000000..9570201
--- /dev/null
+++ b/migrations/script.py.mako
@@ -0,0 +1,22 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision}
+Create Date: ${create_date}
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}
diff --git a/migrations/versions/0cd36ecdd937_.py b/migrations/versions/0cd36ecdd937_.py
new file mode 100644
index 0000000..349cab9
--- /dev/null
+++ b/migrations/versions/0cd36ecdd937_.py
@@ -0,0 +1,42 @@
+"""empty message
+
+Revision ID: 0cd36ecdd937
+Revises: None
+Create Date: 2016-11-01 05:25:42.691768
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '0cd36ecdd937'
+down_revision = None
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('URL',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('url', sa.UnicodeText(), nullable=True),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('url')
+    )
+    op.create_table('file',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('sha256', sa.String(), nullable=True),
+    sa.Column('ext', sa.UnicodeText(), nullable=True),
+    sa.Column('mime', sa.UnicodeText(), nullable=True),
+    sa.Column('addr', sa.UnicodeText(), nullable=True),
+    sa.Column('removed', sa.Boolean(), nullable=True),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('sha256')
+    )
+    ### end Alembic commands ###
+
+
+def downgrade():
+    ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('file')
+    op.drop_table('URL')
+    ### end Alembic commands ###
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..3004091
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,20 @@
+alembic==0.8.8
+click==6.6
+decorator==4.0.10
+Flask==0.11.1
+Flask-Migrate==2.0.0
+Flask-Script==2.0.5
+Flask-SQLAlchemy==2.1
+humanize==0.5.1
+itsdangerous==0.24
+Jinja2==2.8
+Mako==1.0.4
+MarkupSafe==0.23
+python-editor==1.0.1
+python-magic==0.4.12
+requests==2.11.1
+short-url==1.2.2
+six==1.10.0
+SQLAlchemy==1.1.3
+validators==0.11.0
+Werkzeug==0.11.11