Namespace Amazon.CDK.AWS.Cognito.IdentityPool.Alpha

Amazon Cognito Identity Pool Construct Library

Identity Pools are in a separate module while the API is being stabilized. Once we stabilize the module, they will be included into the stable aws-cognito library. Please provide feedback on this experience by creating an issue here

--- cdk-constructs: Experimental 
The APIs of higher level constructs in this module are experimental and under active development.
They are subject to non-backward compatible changes or removal in any future version. These are
not subject to the <a href="https://semver.org/">Semantic Versioning</a> model and breaking changes will be
announced in the release notes. This means that while you may use them, you may need to update
your source code when upgrading to a newer version of this package.

Amazon Cognito Identity Pools enable you to grant your users access to other AWS services.

Identity Pools are one of the two main components of Amazon Cognito, which provides authentication, authorization, and user management for your web and mobile apps. Your users can sign in through a a trusted identity provider, like a user pool or a SAML 2.0 service, as well as with third party providers such as Facebook, Amazon, Google or Apple.

The other main component in Amazon Cognito is user pools. User Pools are user directories that provide sign-up and sign-in options for your app users.

This module is part of the AWS Cloud Development Kit project.

using Amazon.CDK.AWS.Cognito.IdentityPool.Alpha;

Table of Contents

    Identity Pools

    Identity pools provide temporary AWS credentials for users who are guests (unauthenticated) and for users who have authenticated by presenting a token from another identity provider. An identity pool is a store of user identity data specific to an account.

    Identity pools can be used in conjunction with Cognito User Pools or by accessing external federated identity providers directly. Learn more at Amazon Cognito Identity Pools.

    Authenticated and Unauthenticated Identities

    Identity pools define two types of identities: authenticated(user) and unauthenticated (guest). Every identity in an identity pool is either authenticated or unauthenticated. Each identity pool has a default role for authenticated identities, and a default role for unauthenticated identities. Absent other overriding rules (see below), these are the roles that will be assumed by the corresponding users in the authentication process.

    A basic Identity Pool with minimal configuration has no required props, with default authenticated (user) and unauthenticated (guest) roles applied to the identity pool:

    new IdentityPool(this, "myIdentityPool");

    By default, both the authenticated and unauthenticated roles will have no permissions attached. Grant permissions to roles using the public authenticatedRole and unauthenticatedRole properties:

    using Amazon.CDK.AWS.DynamoDB;
Table table;


var identityPool = new IdentityPool(this, "myIdentityPool");

// Grant permissions to authenticated users
table.GrantReadWriteData(identityPool.AuthenticatedRole);
// Grant permissions to unauthenticated guest users
table.GrantReadData(identityPool.UnauthenticatedRole);

//Or add policy statements straight to the role
identityPool.AuthenticatedRole.AddToPrincipalPolicy(new PolicyStatement(new PolicyStatementProps {
    Effect = Effect.ALLOW,
    Actions = new [] { "dynamodb:*" },
    Resources = new [] { "*" }
}));

    The default roles can also be supplied in IdentityPoolProps:

    var stack = new Stack();
var authenticatedRole = new Role(this, "authRole", new RoleProps {
    AssumedBy = new ServicePrincipal("service.amazonaws.com")
});
var unauthenticatedRole = new Role(this, "unauthRole", new RoleProps {
    AssumedBy = new ServicePrincipal("service.amazonaws.com")
});
var identityPool = new IdentityPool(this, "TestIdentityPoolActions", new IdentityPoolProps {
    AuthenticatedRole = authenticatedRole,
    UnauthenticatedRole = unauthenticatedRole
});

    Authentication Providers

    Authenticated identities belong to users who are authenticated by a public login provider (Amazon Cognito user pools, Login with Amazon, Sign in with Apple, Facebook, Google, SAML, or any OpenID Connect Providers) or a developer provider (your own backend authentication process).

    Authentication providers can be associated with an Identity Pool by first associating them with a Cognito User Pool or by associating the provider directly with the identity pool.

    User Pool Authentication Provider

    In order to attach a user pool to an identity pool as an authentication provider, the identity pool needs properties from both the user pool and the user pool client. For this reason identity pools use a UserPoolAuthenticationProvider to gather the necessary properties from the user pool constructs.

    var userPool = new UserPool(this, "Pool");

new IdentityPool(this, "myidentitypool", new IdentityPoolProps {
    IdentityPoolName = "myidentitypool",
    AuthenticationProviders = new IdentityPoolAuthenticationProviders {
        UserPools = new [] { new UserPoolAuthenticationProvider(new UserPoolAuthenticationProviderProps { UserPool = userPool }) }
    }
});

    User pools can also be associated with an identity pool after instantiation. The Identity Pool's addUserPoolAuthentication method returns the User Pool Client that has been created:

    IdentityPool identityPool;

var userPool = new UserPool(this, "Pool");
var userPoolClient = identityPool.AddUserPoolAuthentication(new UserPoolAuthenticationProvider(new UserPoolAuthenticationProviderProps {
    UserPool = userPool
}));

    Server Side Token Check

    With the IdentityPool CDK Construct, by default the pool is configured to check with the integrated user pools to make sure that the user has not been globally signed out or deleted before the identity pool provides an OIDC token or AWS credentials for the user.

    If the user is signed out or deleted, the identity pool will return a 400 Not Authorized error. This setting can be disabled, however, in several ways.

    Setting disableServerSideTokenCheck to true will change the default behavior to no server side token check. Learn more here:

    IdentityPool identityPool;

var userPool = new UserPool(this, "Pool");
identityPool.AddUserPoolAuthentication(new UserPoolAuthenticationProvider(new UserPoolAuthenticationProviderProps {
    UserPool = userPool,
    DisableServerSideTokenCheck = true
}));

    Associating an External Provider Directly

    One or more external identity providers can be associated with an identity pool directly using authenticationProviders:

    new IdentityPool(this, "myidentitypool", new IdentityPoolProps {
    IdentityPoolName = "myidentitypool",
    AuthenticationProviders = new IdentityPoolAuthenticationProviders {
        Amazon = new IdentityPoolAmazonLoginProvider {
            AppId = "amzn1.application.12312k3j234j13rjiwuenf"
        },
        Facebook = new IdentityPoolFacebookLoginProvider {
            AppId = "1234567890123"
        },
        Google = new IdentityPoolGoogleLoginProvider {
            ClientId = "12345678012.apps.googleusercontent.com"
        },
        Apple = new IdentityPoolAppleLoginProvider {
            ServicesId = "com.myappleapp.auth"
        },
        Twitter = new IdentityPoolTwitterLoginProvider {
            ConsumerKey = "my-twitter-id",
            ConsumerSecret = "my-twitter-secret"
        }
    }
});

    To associate more than one provider of the same type with the identity pool, use User Pools, OpenIdConnect, or SAML. Only one provider per external service can be attached directly to the identity pool.

    OpenId Connect and Saml

    OpenID Connect is an open standard for authentication that is supported by a number of login providers. Amazon Cognito supports linking of identities with OpenID Connect providers that are configured through AWS Identity and Access Management.

    An identity provider that supports Security Assertion Markup Language 2.0 (SAML 2.0) can be used to provide a simple onboarding flow for users. The SAML-supporting identity provider specifies the IAM roles that can be assumed by users so that different users can be granted different sets of permissions. Associating an OpenId Connect or Saml provider with an identity pool:

    OpenIdConnectProvider openIdConnectProvider;
SamlProvider samlProvider;


new IdentityPool(this, "myidentitypool", new IdentityPoolProps {
    IdentityPoolName = "myidentitypool",
    AuthenticationProviders = new IdentityPoolAuthenticationProviders {
        OpenIdConnectProviders = new [] { openIdConnectProvider },
        SamlProviders = new [] { samlProvider }
    }
});

    Custom Providers

    The identity pool's behavior can be customized further using custom developer authenticated identities. With developer authenticated identities, users can be registered and authenticated via an existing authentication process while still using Amazon Cognito to synchronize user data and access AWS resources.

    Like the supported external providers, though, only one custom provider can be directly associated with the identity pool.

    OpenIdConnectProvider openIdConnectProvider;

new IdentityPool(this, "myidentitypool", new IdentityPoolProps {
    IdentityPoolName = "myidentitypool",
    AuthenticationProviders = new IdentityPoolAuthenticationProviders {
        Google = new IdentityPoolGoogleLoginProvider {
            ClientId = "12345678012.apps.googleusercontent.com"
        },
        OpenIdConnectProviders = new [] { openIdConnectProvider },
        CustomProvider = "my-custom-provider.example.com"
    }
});

    Role Mapping

    In addition to setting default roles for authenticated and unauthenticated users, identity pools can also be used to define rules to choose the role for each user based on claims in the user's ID token by using Role Mapping. When using role mapping, it's important to be aware of some of the permissions the role will need. An in depth review of roles and role mapping can be found here.

    Using a token-based approach to role mapping will allow mapped roles to be passed through the cognito:roles or cognito:preferred_role claims from the identity provider:

    using Amazon.CDK.AWS.Cognito.IdentityPool.Alpha;


new IdentityPool(this, "myidentitypool", new IdentityPoolProps {
    IdentityPoolName = "myidentitypool",
    RoleMappings = new [] { new IdentityPoolRoleMapping {
        ProviderUrl = IdentityPoolProviderUrl.AMAZON,
        UseToken = true
    } }
});

    Using a rule-based approach to role mapping allows roles to be assigned based on custom claims passed from the identity provider:

    using Amazon.CDK.AWS.Cognito.IdentityPool.Alpha;

Role adminRole;
Role nonAdminRole;

new IdentityPool(this, "myidentitypool", new IdentityPoolProps {
    IdentityPoolName = "myidentitypool",
    // Assign specific roles to users based on whether or not the custom admin claim is passed from the identity provider
    RoleMappings = new [] { new IdentityPoolRoleMapping {
        ProviderUrl = IdentityPoolProviderUrl.AMAZON,
        Rules = new [] { new RoleMappingRule {
            Claim = "custom:admin",
            ClaimValue = "admin",
            MappedRole = adminRole
        }, new RoleMappingRule {
            Claim = "custom:admin",
            ClaimValue = "admin",
            MatchType = RoleMappingMatchType.NOTEQUAL,
            MappedRole = nonAdminRole
        } }
    } }
});

    Role mappings can also be added after instantiation with the Identity Pool's addRoleMappings method:

    using Amazon.CDK.AWS.Cognito.IdentityPool.Alpha;

IdentityPool identityPool;
IdentityPoolRoleMapping myAddedRoleMapping1;
IdentityPoolRoleMapping myAddedRoleMapping2;
IdentityPoolRoleMapping myAddedRoleMapping3;


identityPool.AddRoleMappings(myAddedRoleMapping1, myAddedRoleMapping2, myAddedRoleMapping3);

    Provider Urls

    Role mappings must be associated with the url of an Identity Provider which can be supplied IdentityPoolProviderUrl. Supported Providers have static Urls that can be used:

    using Amazon.CDK.AWS.Cognito.IdentityPool.Alpha;


new IdentityPool(this, "myidentitypool", new IdentityPoolProps {
    IdentityPoolName = "myidentitypool",
    RoleMappings = new [] { new IdentityPoolRoleMapping {
        ProviderUrl = IdentityPoolProviderUrl.FACEBOOK,
        UseToken = true
    } }
});

    For identity providers that don't have static Urls, a custom Url can be supplied:

    using Amazon.CDK.AWS.Cognito.IdentityPool.Alpha;


new IdentityPool(this, "myidentitypool", new IdentityPoolProps {
    IdentityPoolName = "myidentitypool",
    RoleMappings = new [] { new IdentityPoolRoleMapping {
        ProviderUrl = IdentityPoolProviderUrl.Custom("my-custom-provider.com"),
        UseToken = true
    } }
});

    If a provider URL is a CDK Token, as it will be if you are trying to use a previously defined Cognito User Pool, you will need to also provide a mappingKey. This is because by default, the key in the Cloudformation role mapping hash is the providerUrl, and Cloudformation map keys must be concrete strings, they cannot be references. For example:

    using Amazon.CDK.AWS.Cognito;
using Amazon.CDK.AWS.Cognito.IdentityPool.Alpha;

UserPool userPool;
UserPoolClient userPoolClient;

new IdentityPool(this, "myidentitypool", new IdentityPoolProps {
    IdentityPoolName = "myidentitypool",
    RoleMappings = new [] { new IdentityPoolRoleMapping {
        MappingKey = "cognito",
        ProviderUrl = IdentityPoolProviderUrl.UserPool(userPool, userPoolClient),
        UseToken = true
    } }
});

    See here for more information.

    Authentication Flow

    Identity Pool Authentication Flow defaults to the enhanced, simplified flow. The Classic (basic) Authentication Flow can also be implemented using allowClassicFlow:

    new IdentityPool(this, "myidentitypool", new IdentityPoolProps {
    IdentityPoolName = "myidentitypool",
    AllowClassicFlow = true
});

    Cognito Sync

    It's now recommended to integrate AWS AppSync for synchronizing app data across devices, so Cognito Sync features like PushSync, CognitoEvents, and CognitoStreams are not a part of IdentityPool. More information can be found here.

    Importing Identity Pools

    You can import existing identity pools into your stack using Identity Pool static methods with the Identity Pool Id or Arn:

    IdentityPool.FromIdentityPoolId(this, "my-imported-identity-pool", "us-east-1:dj2823ryiwuhef937");
IdentityPool.FromIdentityPoolArn(this, "my-imported-identity-pool", "arn:aws:cognito-identity:us-east-1:123456789012:identitypool/us-east-1:dj2823ryiwuhef937");

    Classes

    IdentityPool

    (experimental) Define a Cognito Identity Pool.
    IdentityPoolAmazonLoginProvider

    (experimental) Login Provider for identity federation using Amazon credentials.
    IdentityPoolAppleLoginProvider

    (experimental) Login Provider for identity federation using Apple credentials.
    IdentityPoolAuthenticationProviders

    (experimental) External Authentication Providers for usage in Identity Pool.
    IdentityPoolFacebookLoginProvider

    (experimental) Login Provider for identity federation using Facebook credentials.
    IdentityPoolGoogleLoginProvider

    (experimental) Login Provider for identity federation using Google credentials.
    IdentityPoolProps

    (experimental) Props for the Identity Pool construct.
    IdentityPoolProviderType

    (experimental) Types of Identity Pool Login Providers.
    IdentityPoolProviderUrl

    (experimental) Keys for Login Providers - each correspond to the client IDs of their respective federation Identity Providers.
    IdentityPoolRoleAttachment

    (experimental) Defines an Identity Pool Role Attachment.
    IdentityPoolRoleAttachmentProps

    (experimental) Props for an Identity Pool Role Attachment.
    IdentityPoolRoleMapping

    (experimental) Map roles to users in the Identity Pool based on claims from the Identity Provider.
    IdentityPoolTwitterLoginProvider

    (experimental) Login Provider for identity federation using Twitter credentials.
    RoleMappingMatchType

    (experimental) Types of matches allowed for role mapping.
    RoleMappingRule

    (experimental) Represents an Identity Pool Role Attachment role mapping rule.
    UserPoolAuthenticationProvider

    (experimental) Defines a User Pool Authentication Provider.
    UserPoolAuthenticationProviderBindConfig

    (experimental) Represents a UserPoolAuthenticationProvider Bind Configuration.
    UserPoolAuthenticationProviderBindOptions

    (experimental) Represents UserPoolAuthenticationProvider Bind Options.
    UserPoolAuthenticationProviderProps

    (experimental) Props for the User Pool Authentication Provider.

    Interfaces

    IIdentityPool

    (experimental) Represents a Cognito Identity Pool.
    IIdentityPoolAmazonLoginProvider

    (experimental) Login Provider for identity federation using Amazon credentials.
    IIdentityPoolAppleLoginProvider

    (experimental) Login Provider for identity federation using Apple credentials.
    IIdentityPoolAuthenticationProviders

    (experimental) External Authentication Providers for usage in Identity Pool.
    IIdentityPoolFacebookLoginProvider

    (experimental) Login Provider for identity federation using Facebook credentials.
    IIdentityPoolGoogleLoginProvider

    (experimental) Login Provider for identity federation using Google credentials.
    IIdentityPoolProps

    (experimental) Props for the Identity Pool construct.
    IIdentityPoolRoleAttachment

    (experimental) Represents an Identity Pool Role Attachment.
    IIdentityPoolRoleAttachmentProps

    (experimental) Props for an Identity Pool Role Attachment.
    IIdentityPoolRoleMapping

    (experimental) Map roles to users in the Identity Pool based on claims from the Identity Provider.
    IIdentityPoolTwitterLoginProvider

    (experimental) Login Provider for identity federation using Twitter credentials.
    IRoleMappingRule

    (experimental) Represents an Identity Pool Role Attachment role mapping rule.
    IUserPoolAuthenticationProvider

    (experimental) Represents the concept of a User Pool Authentication Provider.
    IUserPoolAuthenticationProviderBindConfig

    (experimental) Represents a UserPoolAuthenticationProvider Bind Configuration.
    IUserPoolAuthenticationProviderBindOptions

    (experimental) Represents UserPoolAuthenticationProvider Bind Options.
    IUserPoolAuthenticationProviderProps

    (experimental) Props for the User Pool Authentication Provider.