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I followed these steps to configure a FusionAuth OIDC identity provider to enable Amazon Cognito third-party login:

Cognito Steps:

• Choose your desired region (top right)
• Review default settings if needed
• Click "Manage User Pools"
• Click "Create a user pool" or select the desired pool
• Navigate to "Users and groups"
• Click "Create User: if none exist (phone number format: +3035553322)
• Navigate to "App clients"
• Click "Add an app client"
• Add the app client name and click "Create app client"
• Click "Show details" for desired app client to show client id and client secret
• Navigate to "App client settings"
• Select user pools to enable
• Add callback URL(s)
• Under Allowed OAuth Flows enable "Authorization code grant"
• Under Allowed OAuth Scopes enable openid
• Navigate to "Domain name"
• Add custom domain if desired

FusionAuth Steps:

• Navigate to "Settings"
• Navigate to "Identity Providers"
• From top right dro-down click "Add OpenId Connect"
• Add the Client Id from Cognito App client
• Use HTTP basic authentication
• Add the Client Secret from Cognito App client
• Visit https://cognito-idp.[region].amazonaws.com/[userPoolId]/.well-known/openid-configuration for endpoints [replace variables]
  ** If you have a domain set make sure this is reflected in the endpoints
• Add the Authorization endpoint
• Add the Token endpoint
• Add the Userinfo endpoint
• Add openid to Scope
• Set the Linking strategy to Link on email. Create the user if they do not exist
• A lambda is not required but may be used to map attributes from Cognito
• Enable this identity provider for the desired applications

Short answer:

1. No. FusionAuth does not allow customers to access FusionAuth Cloud.

What you can do instead:

1. You can self host and run FusionAuth right next to your existing database.

2. You can create user attributes that tie FusionAuth users in the cloud to the users in your existing database.

For example, you could create a user.data.profile FusionAuth user profile object with the id of the user in the existing database. And then add a column on the existing side to store the FusionAuth user id. Then use webhooks to keep any shared attributes in sync.
https://fusionauth.io/docs/v1/tech/events-webhooks/

3. You can import everything to FusionAuth, potentially using a Connector.
   https://fusionauth.io/docs/v1/tech/connectors/

In all cases you'll need to migrate the auth related portions of the database to FusionAuth.

Here's a guide for that: https://fusionauth.io/docs/v1/tech/migration-guide/general

One final thought is you could wrap FusionAuth and your legacy database into a single API (that you write; possibly set up a proxy) so even if there are two databases/applications containing user data, it will look like one to all consumers of it.

In your instance of FusionAuth navigate to "Settings" > "Identity Providers" and click to add the "SAML v2" identity provider.

In the setup screen for the SAML v2 IdP set the "IdP endpoint" to https://samltest.id/idp/profile/Redirect/SSO

Set the "NameID format" to emailAddress

You will also want to check under the "Options" tab and toggle "Use NameID for email" to on.

Save this configuration.

Then in FusionAuth, go to "Settings" > "Key Master" and click to "Import Certificate".

Use the certificate under SAMLtest’s IdP from https://samltest.id/download/

Save the certificate in FusionAuth.

Then go back to the your SAML v2 IdP settings and add the recently saved certificate to the "Verification key".

Be sure to enable this IdP for your test application.

You should then see the "Login with SAML" button available for when on the FusionAuth hosted login page.

Before you can finish testing the login you''ll need to click the green magnifying glass for your SAML v2 IdP and copy the Metadata URL under SAML v2 Integration details.

Then visit https://samltest.id/upload.php and add the metadata url so SAMLTEST.ID can trust requests from FusionAuth.

Now you can click to "Login with SAML" and you should be redirected to the SAMLTEST.ID login page assuming you have set everything correctly.

Finish logging in by using any set of credentials provided on that page.

You should then be redirected back to your application and a corresponding user successfully created in FusionAuth.

If you would like to map attributes from the SAML response to the User object in FusionAuth you will need to use a SAML reconcile lambda.

https://fusionauth.io/docs/v1/tech/lambdas/samlv2-response-reconcile

There are also other examples for testing the SAMLv2 IdP funcitionality provided by FusionAuth.

Be sure to visit our documentation for more details.

https://fusionauth.io/docs/v1/tech/identity-providers/samlv2/