// Package ssocreds provides a credential provider for retrieving temporary AWS
// credentials using an SSO access token.
//
// IMPORTANT: The provider in this package does not initiate or perform the AWS
// SSO login flow. The SDK provider expects that you have already performed the
// SSO login flow using AWS CLI using the "aws sso login" command, or by some
// other mechanism. The provider must find a valid non-expired access token for
// the AWS SSO user portal URL in ~/.aws/sso/cache. If a cached token is not
// found, it is expired, or the file is malformed an error will be returned.
//
// # Loading AWS SSO credentials with the AWS shared configuration file
//
// You can use configure AWS SSO credentials from the AWS shared configuration file by
// providing the specifying the required keys in the profile:
//
//	sso_account_id
//	sso_region
//	sso_role_name
//	sso_start_url
//
// For example, the following defines a profile "devsso" and specifies the AWS
// SSO parameters that defines the target account, role, sign-on portal, and
// the region where the user portal is located. Note: all SSO arguments must be
// provided, or an error will be returned.
//
//	[profile devsso]
//	sso_start_url = https://my-sso-portal.awsapps.com/start
//	sso_role_name = SSOReadOnlyRole
//	sso_region = us-east-1
//	sso_account_id = 123456789012
//
// Using the config module, you can load the AWS SDK shared configuration, and
// specify that this profile be used to retrieve credentials. For example:
//
//	config, err := config.LoadDefaultConfig(context.TODO(), config.WithSharedConfigProfile("devsso"))
//	if err != nil {
//	    return err
//	}
//
// # Programmatically loading AWS SSO credentials directly
//
// You can programmatically construct the AWS SSO Provider in your application,
// and provide the necessary information to load and retrieve temporary
// credentials using an access token from ~/.aws/sso/cache.
//
//	client := sso.NewFromConfig(cfg)
//
//	var provider aws.CredentialsProvider
//	provider = ssocreds.New(client, "123456789012", "SSOReadOnlyRole", "us-east-1", "https://my-sso-portal.awsapps.com/start")
//
//	// Wrap the provider with aws.CredentialsCache to cache the credentials until their expire time
//	provider = aws.NewCredentialsCache(provider)
//
//	credentials, err := provider.Retrieve(context.TODO())
//	if err != nil {
//	    return err
//	}
//
// It is important that you wrap the Provider with aws.CredentialsCache if you
// are programmatically constructing the provider directly. This prevents your
// application from accessing the cached access token and requesting new
// credentials each time the credentials are used.
//
// # Additional Resources
//
// Configuring the AWS CLI to use AWS Single Sign-On:
// https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-sso.html
//
// AWS Single Sign-On User Guide:
// https://docs.aws.amazon.com/singlesignon/latest/userguide/what-is.html
package ssocreds