authentication.go

package kafkatarget

// This code is copied from Promtail. The herokutarget package is used to
// configure and run the targets that can read heroku entries and forward them
// to other loki components.

import (
	"crypto/sha256"
	"crypto/sha512"

	"github.com/xdg-go/scram"
)

// copied from https://github.com/Shopify/sarama/blob/44627b731c60bb90efe25573e7ef2b3f8df3fa23/examples/sasl_scram_client/scram_client.go
var (
	SHA256 scram.HashGeneratorFcn = sha256.New
	SHA512 scram.HashGeneratorFcn = sha512.New
)

// XDGSCRAMClient implements sarama.SCRAMClient
type XDGSCRAMClient struct {
	*scram.Client
	*scram.ClientConversation
	scram.HashGeneratorFcn
}

func (x *XDGSCRAMClient) Begin(userName, password, authzID string) (err error) {
	x.Client, err = x.HashGeneratorFcn.NewClient(userName, password, authzID)
	if err != nil {
		return err
	}
	x.ClientConversation = x.Client.NewConversation()
	return nil
}

func (x *XDGSCRAMClient) Step(challenge string) (response string, err error) {
	response, err = x.ClientConversation.Step(challenge)
	return
}

func (x *XDGSCRAMClient) Done() bool {
	return x.ClientConversation.Done()
}