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# -*- coding: utf-8 -*-
"""Submodule containing the implementation for the FingerprintAdapter.

This file contains an implementation of a Transport Adapter that validates
the fingerprints of SSL certificates presented upon connection.
"""
from requests.adapters import HTTPAdapter

from .._compat import poolmanager


class FingerprintAdapter(HTTPAdapter):
    """
    A HTTPS Adapter for Python Requests that verifies certificate fingerprints,
    instead of certificate hostnames.

    Example usage:

    .. code-block:: python

        import requests
        import ssl
        from requests_toolbelt.adapters.fingerprint import FingerprintAdapter

        twitter_fingerprint = '...'
        s = requests.Session()
        s.mount(
            'https://twitter.com',
            FingerprintAdapter(twitter_fingerprint)
        )

    The fingerprint should be provided as a hexadecimal string, optionally
    containing colons.
    """

    __attrs__ = HTTPAdapter.__attrs__ + ['fingerprint']

    def __init__(self, fingerprint, **kwargs):
        self.fingerprint = fingerprint

        super(FingerprintAdapter, self).__init__(**kwargs)

    def init_poolmanager(self, connections, maxsize, block=False):
        self.poolmanager = poolmanager.PoolManager(
            num_pools=connections,
            maxsize=maxsize,
            block=block,
            assert_fingerprint=self.fingerprint)