============
PyMongoCrypt
============
:Info: Python bindings for libmongocrypt. See
       `GitHub <https://github.com/mongodb/libmongocrypt/tree/master/bindings/python>`_
       for the latest source.
:Author: Shane Harvey

About
=====

Python wrapper library for libmongocrypt that supports client side encryption
in drivers. PyMongoCrypt uses `cffi <https://pypi.org/project/cffi/>`_ and
`cryptography <https://pypi.org/project/cryptography/>`_.

PyMongoCrypt supports Python 3.7+ and PyPy3.7+.

Support / Feedback
==================

For issues with, questions about, or feedback for PyMongoCrypt, please look into
our `support channels <http://www.mongodb.org/about/support>`_. Please
do not email any of the PyMongoCrypt developers directly with issues or
questions - you're more likely to get an answer on the `mongodb-user
<http://groups.google.com/group/mongodb-user>`_ list on Google Groups.

Bugs / Feature Requests
=======================

Think you’ve found a bug? Want to see a new feature in PyMongoCrypt?
Please open a case in our issue management tool, JIRA:

- `Create an account and login <https://jira.mongodb.org>`_.
- Navigate to `the PYTHON project <https://jira.mongodb.org/browse/PYTHON>`_.
- Click **Create Issue** - Please provide as much information as possible about the issue type and how to reproduce it.

Bug reports in JIRA for all driver projects (i.e. PYTHON, CSHARP, JAVA) and the
Core Server (i.e. SERVER) project are **public**.

How To Ask For Help
-------------------

Please include all of the following information when opening an issue:

- Detailed steps to reproduce the problem, including full traceback, if possible.
- The exact python version used, with patch level::

  $ python -c "import sys; print(sys.version)"

- The exact version of PyMongoCrypt used::

  $ python -c "import pymongocrypt; print(pymongocrypt.__version__)"

- The exact version of libbmongocrypt used by PyMongoCrypt::

  $ python -c "import pymongocrypt; print(pymongocrypt.libmongocrypt_version())"

- The exact version of PyMongo used (if applicable), with patch level::

  $ python -c "import pymongo; print(pymongo.version); print(pymongo.has_c())"

- The operating system and version (e.g. Windows 7, OSX 10.8, ...)
- Web framework or asynchronous network library used, if any, with version (e.g.
  Django 1.7, mod_wsgi 4.3.0, gevent 1.0.1, Tornado 4.0.2, ...)

Security Vulnerabilities
------------------------

If you've identified a security vulnerability in a driver or any other
MongoDB project, please report it according to the `instructions here
<http://docs.mongodb.org/manual/tutorial/create-a-vulnerability-report>`_.

Installation
============

PyMongoCrypt can be installed with `pip <http://pypi.python.org/pypi/pip>`_::

  $ python -m pip install pymongocrypt
  $ python -c "import pymongocrypt; print(pymongocrypt.libmongocrypt_version())"
  1.2.1


PyMongoCrypt ships wheels for macOS, Windows, and manylinux2010 that include
an embedded libmongocrypt build.

Installing from wheels on Linux requires pip 19 or later because it adds
`support for manylinux2010 wheels <https://pip.pypa.io/en/stable/news/#id108>`_.
Older versions of pip will attempt installation using the
pymongocrypt-X.Y.tar.gz source distribution which requires the extra step of
downloading and installing libmongocrypt as described below.
Users can upgrade to pip 19 by running::

  $ python -m pip install --upgrade 'pip>=19'

Installing from source
----------------------

Installing from source (or the pymongocrypt-X.Y.tar.gz source distribution,
or pip < 19 on Linux) requires an extra step of installing libmongocrypt.
First, install PyMongoCrypt from source::

  $ git clone git@github.com:mongodb/libmongocrypt.git
  $ python -m pip install ./libmongocrypt/bindings/python

Next, install libmongocrypt.

libmongocrypt is continuously built and published on evergreen.
The latest tarball containing libmongocrypt built on all supported variants is
`published here <https://s3.amazonaws.com/mciuploads/libmongocrypt/all/master/latest/libmongocrypt-all.tar.gz>`_.
Download and extract ``libmongocrypt-all.tar.gz`` and set
``PYMONGOCRYPT_LIB`` to the path to your operating system's libmongocrypt.so file.
For example::

  $ curl -O https://s3.amazonaws.com/mciuploads/libmongocrypt/all/master/latest/libmongocrypt-all.tar.gz
  $ mkdir libmongocrypt-all && tar xzf libmongocrypt-all.tar.gz -C libmongocrypt-all
  $ ls libmongocrypt-all
  amazon2             rhel-62-64-bit      rhel72-zseries-test ubuntu1604-arm64
  debian10            rhel-67-s390x       suse12-64           ubuntu1804-64
  debian92            rhel-70-64-bit      suse12-s390x        ubuntu1804-arm64
  linux-64-amazon-ami rhel-71-ppc64el     suse15-64           windows-test
  macos               rhel-80-64-bit      ubuntu1604

macOS::

  $ # Set PYMONGOCRYPT_LIB for macOS:
  $ export PYMONGOCRYPT_LIB=$(pwd)/libmongocrypt-all/macos/nocrypto/lib/libmongocrypt.dylib
  $ python -c "import pymongocrypt; print(pymongocrypt.libmongocrypt_version())"
  1.2.1

Windows::

  $ # Set PYMONGOCRYPT_LIB for Windows:
  $ chmod +x $(pwd)/libmongocrypt-all/windows-test/nocrypto/bin/mongocrypt.dll
  $ export PYMONGOCRYPT_LIB=$(pwd)/libmongocrypt-all/windows-test/nocrypto/bin/mongocrypt.dll
  $ python -c "import pymongocrypt; print(pymongocrypt.libmongocrypt_version())"
  1.2.1

Linux::

  $ # Set PYMONGOCRYPT_LIB for RHEL 6.2 x86_64:
  $ export PYMONGOCRYPT_LIB=$(pwd)/libmongocrypt-all/rhel-62-64-bit/nocrypto/lib64/libmongocrypt.so
  $ python -c "import pymongocrypt; print(pymongocrypt.libmongocrypt_version())"
  1.2.1

Dependencies
============

PyMongoCrypt supports Python 3.7+ and PyPy3.7+.

PyMongoCrypt requires `cffi <https://pypi.org/project/cffi/>`_ and
`cryptography <https://pypi.org/project/cryptography/>`_.

If not installed using one of the official wheels, PyMongoCrypt also requires
libmongocrypt to be installed on your system. If libmongocrypt is not
installed you will see an error like this:

.. code-block:: python

  >>> import pymongocrypt
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
    File "pymongocrypt/__init__.py", line 15, in <module>
      from pymongocrypt.binding import libmongocrypt_version, lib
    File "pymongocrypt/binding.py", line 803, in <module>
      lib = ffi.dlopen(os.environ.get('PYMONGOCRYPT_LIB', 'mongocrypt'))
    File "/.../lib/python3.7/site-packages/cffi/api.py", line 146, in dlopen
      lib, function_cache = _make_ffi_library(self, name, flags)
    File "/.../lib/python3.7/site-packages/cffi/api.py", line 828, in _make_ffi_library
      backendlib = _load_backend_lib(backend, libname, flags)
    File "/.../lib/python3.7/site-packages/cffi/api.py", line 823, in _load_backend_lib
      raise OSError(msg)
  OSError: ctypes.util.find_library() did not manage to locate a library called 'mongocrypt'


Use the ``PYMONGOCRYPT_LIB`` environment variable to load a locally installed
libmongocrypt build without relying on platform specific library path environment
variables, like ``LD_LIBRARY_PATH``. For example::

  $ export PYMONGOCRYPT_LIB='/path/to/libmongocrypt.so'
  $ python -c "import pymongocrypt; print(pymongocrypt.libmongocrypt_version())"
  1.2.1

Testing
=======

The easiest way to run the tests is to run **python setup.py test** in
the root of the distribution.