Accessing credentials
An intentional decision with Amplify Auth was to avoid any public methods exposing credentials or manipulating them.
With Auth, you simply sign in and it handles everything else needed to keep the credentials up to date and vend them to the other categories.
However, if you need to access them in relation to working with an API outside Amplify or want access to AWS specific identifying information (e.g. IdentityId), you can access these implementation details by casting the result of fetchAuthSession as follows:
1import AWSPluginsCore2
3Amplify.Auth.fetchAuthSession { result in4 do {5 let session = try result.get()6
7 // Get user sub or identity id8 if let identityProvider = session as? AuthCognitoIdentityProvider {9 let usersub = try identityProvider.getUserSub().get()10 let identityId = try identityProvider.getIdentityId().get()11 print("User sub - \(usersub) and identity id \(identityId)")12 }13
14 // Get AWS credentials15 if let awsCredentialsProvider = session as? AuthAWSCredentialsProvider {16 let credentials = try awsCredentialsProvider.getAWSCredentials().get()17 // Do something with the credentials18 }19
20 // Get cognito user pool token21 if let cognitoTokenProvider = session as? AuthCognitoTokensProvider {22 let tokens = try cognitoTokenProvider.getCognitoTokens().get()23 // Do something with the Cognito tokens24 }25
26 } catch {27 print("Fetch auth session failed with error - \(error)")28 }29}
If you have enabled guest user in Cognito Identity Pool and no user is signed in, you will be able to access only identityId and AWS credentials. All other session details will give you an error.
1import AWSPluginsCore2
3Amplify.Auth.fetchAuthSession { result in4 do {5 let session = try result.get()6
7 // Get identity id8 if let identityProvider = session as? AuthCognitoIdentityProvider {9 let identityId = try identityProvider.getIdentityId().get()10 print("Identity id \(identityId)")11 }12
13 // Get AWS credentials14 if let awsCredentialsProvider = session as? AuthAWSCredentialsProvider {15 let credentials = try awsCredentialsProvider.getAWSCredentials().get()16 // Do something with the credentials17 }18
19 } catch {20 print("Fetch auth session failed with error - \(error)")21 }22}