Initiate Auth
cognitoidentityprovider_initiate_auth | R Documentation |
Initiates sign-in for a user in the Amazon Cognito user directory¶
Description¶
Initiates sign-in for a user in the Amazon Cognito user directory. You
can't sign in a user with a federated IdP with initiate_auth
. For more
information, see Adding user pool sign-in through a third
party.
Amazon Cognito doesn't evaluate Identity and Access Management (IAM) policies in requests for this API operation. For this operation, you can't use IAM credentials to authorize requests, and you can't grant IAM permissions in policies. For more information about authorization models in Amazon Cognito, see Using the Amazon Cognito user pools API and user pool endpoints.
This action might generate an SMS text message. Starting June 1, 2021, US telecom carriers require you to register an origination phone number before you can send SMS messages to US phone numbers. If you use SMS text messages in Amazon Cognito, you must register a phone number with Amazon Pinpoint. Amazon Cognito uses the registered number automatically. Otherwise, Amazon Cognito users who must receive SMS messages might not be able to sign up, activate their accounts, or sign in.
If you have never used SMS text messages with Amazon Cognito or any other Amazon Web Services service, Amazon Simple Notification Service might place your account in the SMS sandbox. In sandbox mode , you can send messages only to verified phone numbers. After you test your app while in the sandbox environment, you can move out of the sandbox and into production. For more information, see SMS message settings for Amazon Cognito user pools in the Amazon Cognito Developer Guide.
Usage¶
cognitoidentityprovider_initiate_auth(AuthFlow, AuthParameters,
ClientMetadata, ClientId, AnalyticsMetadata, UserContextData)
Arguments¶
AuthFlow
[required] The authentication flow for this call to run. The API action will depend on this value. For example:
REFRESH_TOKEN_AUTH
takes in a valid refresh token and returns new tokens.USER_SRP_AUTH
takes inUSERNAME
andSRP_A
and returns the SRP variables to be used for next challenge execution.USER_PASSWORD_AUTH
takes inUSERNAME
andPASSWORD
and returns the next challenge or tokens.
Valid values include:
USER_SRP_AUTH
: Authentication flow for the Secure Remote Password (SRP) protocol.REFRESH_TOKEN_AUTH
/REFRESH_TOKEN
: Authentication flow for refreshing the access token and ID token by supplying a valid refresh token.CUSTOM_AUTH
: Custom authentication flow.USER_PASSWORD_AUTH
: Non-SRP authentication flow; user name and password are passed directly. If a user migration Lambda trigger is set, this flow will invoke the user migration Lambda if it doesn't find the user name in the user pool.
ADMIN_NO_SRP_AUTH
isn't a valid value.AuthParameters
The authentication parameters. These are inputs corresponding to the
AuthFlow
that you're invoking. The required values depend on the value ofAuthFlow
:For
USER_SRP_AUTH
:USERNAME
(required),SRP_A
(required),SECRET_HASH
(required if the app client is configured with a client secret),DEVICE_KEY
.For
USER_PASSWORD_AUTH
:USERNAME
(required),PASSWORD
(required),SECRET_HASH
(required if the app client is configured with a client secret),DEVICE_KEY
.For
REFRESH_TOKEN_AUTH/REFRESH_TOKEN
:REFRESH_TOKEN
(required),SECRET_HASH
(required if the app client is configured with a client secret),DEVICE_KEY
.For
CUSTOM_AUTH
:USERNAME
(required),SECRET_HASH
(if app client is configured with client secret),DEVICE_KEY
. To start the authentication flow with password verification, includeChallengeName: SRP_A
andSRP_A: (The SRP_A Value)
.
For more information about
SECRET_HASH
, see Computing secret hash values. For information aboutDEVICE_KEY
, see Working with user devices in your user pool.ClientMetadata
A map of custom key-value pairs that you can provide as input for certain custom workflows that this action triggers.
You create custom workflows by assigning Lambda functions to user pool triggers. When you use the InitiateAuth API action, Amazon Cognito invokes the Lambda functions that are specified for various triggers. The ClientMetadata value is passed as input to the functions for only the following triggers:
Pre signup
Pre authentication
User migration
When Amazon Cognito invokes the functions for these triggers, it passes a JSON payload, which the function receives as input. This payload contains a
validationData
attribute, which provides the data that you assigned to the ClientMetadata parameter in your InitiateAuth request. In your function code in Lambda, you can process thevalidationData
value to enhance your workflow for your specific needs.When you use the InitiateAuth API action, Amazon Cognito also invokes the functions for the following triggers, but it doesn't provide the ClientMetadata value as input:
Post authentication
Custom message
Pre token generation
Create auth challenge
Define auth challenge
For more information, see Customizing user pool Workflows with Lambda Triggers in the Amazon Cognito Developer Guide.
When you use the ClientMetadata parameter, remember that Amazon Cognito won't do the following:
Store the ClientMetadata value. This data is available only to Lambda triggers that are assigned to a user pool to support custom workflows. If your user pool configuration doesn't include triggers, the ClientMetadata parameter serves no purpose.
Validate the ClientMetadata value.
Encrypt the ClientMetadata value. Don't use Amazon Cognito to provide sensitive information.
ClientId
[required] The app client ID.
AnalyticsMetadata
The Amazon Pinpoint analytics metadata that contributes to your metrics for
initiate_auth
calls.UserContextData
Contextual data about your user session, such as the device fingerprint, IP address, or location. Amazon Cognito advanced security evaluates the risk of an authentication event based on the context that your app generates and passes to Amazon Cognito when it makes API requests.
Value¶
A list with the following syntax:
list(
ChallengeName = "SMS_MFA"|"SOFTWARE_TOKEN_MFA"|"SELECT_MFA_TYPE"|"MFA_SETUP"|"PASSWORD_VERIFIER"|"CUSTOM_CHALLENGE"|"DEVICE_SRP_AUTH"|"DEVICE_PASSWORD_VERIFIER"|"ADMIN_NO_SRP_AUTH"|"NEW_PASSWORD_REQUIRED",
Session = "string",
ChallengeParameters = list(
"string"
),
AuthenticationResult = list(
AccessToken = "string",
ExpiresIn = 123,
TokenType = "string",
RefreshToken = "string",
IdToken = "string",
NewDeviceMetadata = list(
DeviceKey = "string",
DeviceGroupKey = "string"
)
)
)
Request syntax¶
svc$initiate_auth(
AuthFlow = "USER_SRP_AUTH"|"REFRESH_TOKEN_AUTH"|"REFRESH_TOKEN"|"CUSTOM_AUTH"|"ADMIN_NO_SRP_AUTH"|"USER_PASSWORD_AUTH"|"ADMIN_USER_PASSWORD_AUTH",
AuthParameters = list(
"string"
),
ClientMetadata = list(
"string"
),
ClientId = "string",
AnalyticsMetadata = list(
AnalyticsEndpointId = "string"
),
UserContextData = list(
IpAddress = "string",
EncodedData = "string"
)
)
Examples¶
## Not run:
# The following example signs in the user mytestuser with analytics data,
# client metadata, and user context data for advanced security.
svc$initiate_auth(
AnalyticsMetadata = list(
AnalyticsEndpointId = "d70b2ba36a8c4dc5a04a0451a31a1e12"
),
AuthFlow = "USER_PASSWORD_AUTH",
AuthParameters = list(
PASSWORD = "This-is-my-test-99!",
SECRET_HASH = "oT5ZkS8ctnrhYeeGsGTvOzPhoc/Jd1cO5fueBWFVmp8=",
USERNAME = "mytestuser"
),
ClientId = "1example23456789",
ClientMetadata = list(
MyTestKey = "MyTestValue"
),
UserContextData = list(
EncodedData = "AmazonCognitoAdvancedSecurityData_object",
IpAddress = "192.0.2.1"
)
)
## End(Not run)