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Filename : nfsn.py
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# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import hashlib
import random
import string
import time

from libcloud.common.base import ConnectionUserAndKey
from libcloud.common.base import JsonResponse
from libcloud.common.types import InvalidCredsError, ProviderError
from libcloud.utils.py3 import basestring, httplib, urlencode


SALT_CHARACTERS = string.ascii_letters + string.digits


class NFSNException(ProviderError):
    def __init__(self, value, http_code, code, driver=None):
        self.code = code
        super(NFSNException, self).__init__(value, http_code, driver)


class NFSNResponse(JsonResponse):

    def parse_error(self):
        if self.status == httplib.UNAUTHORIZED:
            raise InvalidCredsError('Invalid provider credentials')

        body = self.parse_body()

        if isinstance(body, basestring):
            return body + ' (HTTP Code: %d)' % self.status

        error = body.get('error', None)
        debug = body.get('debug', None)
        # If we only have one of "error" or "debug", use the one that we have.
        # If we have both, use both, with a space character in between them.
        value = 'No message specified'
        if error is not None:
            value = error
        if debug is not None:
            value = debug
        if error is not None and value is not None:
            value = error + ' ' + value
        value = value + ' (HTTP Code: %d)' % self.status

        return value


class NFSNConnection(ConnectionUserAndKey):
    host = 'api.nearlyfreespeech.net'
    responseCls = NFSNResponse
    allow_insecure = False

    def _header(self, action, data):
        """ Build the contents of the X-NFSN-Authentication HTTP header. See
        https://members.nearlyfreespeech.net/wiki/API/Introduction for
        more explanation. """
        login = self.user_id
        timestamp = self._timestamp()
        salt = self._salt()
        api_key = self.key
        data = urlencode(data)
        data_hash = hashlib.sha1(data.encode('utf-8')).hexdigest()

        string = ';'.join((login, timestamp, salt, api_key, action, data_hash))
        string_hash = hashlib.sha1(string.encode('utf-8')).hexdigest()

        return ';'.join((login, timestamp, salt, string_hash))

    def request(self, action, params=None, data='', headers=None,
                method='GET'):
        """ Add the X-NFSN-Authentication header to an HTTP request. """
        if not headers:
            headers = {}
        if not params:
            params = {}
        header = self._header(action, data)

        headers['X-NFSN-Authentication'] = header
        if method == 'POST':
            headers['Content-Type'] = 'application/x-www-form-urlencoded'

        return ConnectionUserAndKey.request(self, action, params, data,
                                            headers, method)

    def encode_data(self, data):
        """ NFSN expects the body to be regular key-value pairs that are not
        JSON-encoded. """
        if data:
            data = urlencode(data)
        return data

    def _salt(self):
        """ Return a 16-character alphanumeric string. """
        r = random.SystemRandom()
        return ''.join(r.choice(SALT_CHARACTERS) for _ in range(16))

    def _timestamp(self):
        """ Return the current number of seconds since the Unix epoch,
        as a string. """
        return str(int(time.time()))