Using impersonation roles

To access mailbox data, use the Amazon WorkMail API action AssumeImpersonationRole. For more details on Amazon WorkMail APIs, see API Reference.

AssumeImpersonationRole returns a Token. This Token must be passed within 15 minutes to the EWS protocol through the HTTP header Authorization.

The following examples demonstrate how to use impersonation roles with the EWS protocol. The constants used in the examples specify the following details unique to your organization and account:

• WORKMAIL_ORGANIZATION_ID – Amazon WorkMail organization ID

• IMPERSONATION_ROLE_ID – Impersonation role ID

• WORKMAIL_EWS_URL – EWS endpoint available at Amazon WorkMail endpoints and quotas

• EMAIL_ADDRESS – Email address of the user mailbox

Example Java – EWS Java API

import software.amazon.awssdk.services.workmail.WorkMailClient;
import software.amazon.awssdk.services.workmail.model.AssumeImpersonationRoleRequest;
import software.amazon.awssdk.services.workmail.model.AssumeImpersonationRoleResponse;

import microsoft.exchange.webservices.data.core.ExchangeService;
import microsoft.exchange.webservices.data.core.enumeration.misc.ExchangeVersion;
import microsoft.exchange.webservices.data.misc.ImpersonatedUserId;
import microsoft.exchange.webservices.data.core.enumeration.misc.ConnectingIdType;

// ...

AssumeImpersonationRoleResponse response = workMailClient.assumeImpersonationRole(
    AssumeImpersonationRoleRequest.builder()
        .organizationId(WORKMAIL_ORGANIZATION_ID)
        .impersonationRoleId(IMPERSONATION_ROLE_ID)
        .build());

ExchangeService exchangeService = new ExchangeService(ExchangeVersion.Exchange2010_SP2);
exchangeService.setUrl(URI.create(WORKMAIL_EWS_URL));
exchangeService.getHttpHeaders().put("Authorization", "Bearer " + response.token());
exchangeService.setImpersonatedUserId(new ImpersonatedUserId(ConnectingIdType.SmtpAddress, EMAIL_ADDRESS));

Example .Net – EWS Managed API

using Amazon.WorkMail;
using Amazon.WorkMail.Model;

using Microsoft.Exchange.WebServices.Data;

// ...

AssumeImpersonationRoleRequest request = new AssumeImpersonationRoleRequest();
request.OrganizationId = WORKMAIL_ORGANIZATION_ID;
request.ImpersonationRoleId = IMPERSONATION_ROLE_ID;
AssumeImpersonationRoleResponse response = workMailClient.AssumeImpersonationRole(request);

ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010_SP2);
service.Url = new Uri(WORKMAIL_EWS_URL);
service.HttpHeaders.Add("Authorization", "Bearer " + response.Token);
service.ImpersonatedUserId = new ImpersonatedUserId(ConnectingIdType.SmtpAddress, EMAIL_ADDRESS);

Example Python – Exchangelib

import boto3

from requests.auth import AuthBase
from exchangelib.transport import AUTH_TYPE_MAP
from exchangelib import Configuration, Account, Version, IMPERSONATION
from exchangelib.version import EXCHANGE_2010_SP2


work_mail_client = boto3.client("workmail")

class ImpersonationRoleAuth(AuthBase):
    def __init__(self):
         self.token = work_mail_client.assume_impersonation_role(
             OrganizationId=WORKMAIL_ORGANIZATION_ID,
             ImpersonationRoleId=IMPERSONATION_ROLE_ID
        )["Token"]

     def __call__(self, r):
         r.headers["Authorization"] = "Bearer " + self.token
         return r

AUTH_TYPE_MAP["ImpersonationRoleAuth"] = ImpersonationRoleAuth

ews_config = Configuration(
     service_endpoint=WORKMAIL_EWS_URL,
     version=Version(build=EXCHANGE_2010_SP2),
     auth_type="ImpersonationRoleAuth"
)
ews_account = Account(
     config=ews_config,
     primary_smtp_address=EMAIL_ADDRESS,
     access_type=IMPERSONATION
)