node.js - Cognito USER_SRP_AUTHENTICATION -

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in aws cognito docs, http://docs.aws.amazon.com/awsjavascriptsdk/latest/aws/cognitoidentityserviceprovider.html#initiateauth-property

one of supported authentication flow user_srp_auth. when call initiateauth(), get

invalidparameterexception: missing required parameter srp_a error.

the doc silent how get/generate srp_a method requires. can find how use auth flow?

thanks in advance!

i had similar problem "admininitiateauth" method. able mine working enabling admin_no_srp_auth in userpool. go userpool > apps > show details , check checkbox "enable sign-in api server-based authentication (admin_no_srp_auth)". once done, use authflowtype.admin_no_srp_auth. 

// example java implementation...  admininitiateauthrequest request = new admininitiateauthrequest(); request.withclientid(client_app_id); // clinet id assigned in userpool request.withuserpoolid(user_pool_id); // id of user pool  request.addauthparametersentry("username", userid); request.addauthparametersentry("password", pwd); request.withauthflow(authflowtype.admin_no_srp_auth);  // have enable workflow on user pool! // may able set workflow authflowtype.user_srp_auth if don't use admininitiaterequest  // initiate auth request admininitiateauthresult result = identityuserpoolproviderclient.admininitiateauth(request);

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