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import python_http_client

class BaseInterface(object):

def __init__(self, auth, host, impersonate_subuser):

"""

Construct the Twilio SendGrid v3 API object.

Note that the underlying client is being set up during initialization,

therefore changing attributes in runtime will not affect HTTP client

behaviour.

:param auth: the authorization header

:type auth: string

:param impersonate_subuser: the subuser to impersonate. Will be passed

by "On-Behalf-Of" header by underlying

client. See

https://sendgrid.com/docs/User_Guide/Settings/subusers.html

for more details

:type impersonate_subuser: string

:param host: base URL for API calls

:type host: string

"""

from . import __version__

self.auth = auth

self.host = host

self.impersonate_subuser = impersonate_subuser

self.version = __version__

self.useragent = 'sendgrid/{};python'.format(self.version)

self.client = python_http_client.Client(

host=self.host,

request_headers=self._default_headers,

version=3)

@property

def _default_headers(self):

"""Set the default header for a Twilio SendGrid v3 API call"""

headers = {

"Authorization": self.auth,

"User-Agent": self.useragent,

"Accept": 'application/json'

}

if self.impersonate_subuser:

headers['On-Behalf-Of'] = self.impersonate_subuser

return headers

def reset_request_headers(self):

self.client.request_headers = self._default_headers

def send(self, message):

"""Make a Twilio SendGrid v3 API request with the request body generated by

the Mail object

:param message: The Twilio SendGrid v3 API request body generated by the Mail

object

:type message: Mail

"""

if not isinstance(message, dict):

message = message.get()

return self.client.mail.send.post(request_body=message)