Fix aws_msk_iam_v2 module Authentication failure bug

Use `CredentialsProvider` instead of static `Credentials`. See segmentio#976

sasl/aws_msk_iam_v2/README.md

@@ -12,49 +12,4 @@ You can add this module to your dependency by running the command below.
 go get github.com/segmentio/kafka-go/sasl/aws_msk_iam_v2
 ```
 
-You can use the `Mechanism` for SASL authentication, like below.
-
-```go
-package main
-
-import (
-	"context"
-	"crypto/tls"
-	"time"
-
-	signer "github.com/aws/aws-sdk-go-v2/aws/signer/v4"
-	awsCfg "github.com/aws/aws-sdk-go-v2/config"
-	"github.com/segmentio/kafka-go"
-	"github.com/segmentio/kafka-go/sasl/aws_msk_iam_v2"
-)
-
-func main() {
-	ctx := context.Background()
-
-	// using aws-sdk-go-v2
-	// NOTE: address error properly
-
-	cfg, _ := awsCfg.LoadDefaultConfig(ctx)
-	creds, _ := cfg.Credentials.Retrieve(ctx)
-	m := &aws_msk_iam_v2.Mechanism{
-		Signer:      signer.NewSigner(),
-		Credentials: creds,
-		Region:      "us-east-1",
-		SignTime:    time.Now(),
-		Expiry:      time.Minute * 5,
-	}
-	config := kafka.ReaderConfig{
-		Brokers:     []string{"https://localhost"},
-		GroupID:     "some-consumer-group",
-		GroupTopics: []string{"some-topic"},
-		Dialer: &kafka.Dialer{
-			Timeout:       10 * time.Second,
-			DualStack:     true,
-			SASLMechanism: m,
-			TLS:           &tls.Config{},
-		},
-	}
-}
-
-
-```
+Please find the sample code in [example_test.go](./example_test.go), you can use the `Mechanism` for SASL authentication of `Reader` and `Writer`.

sasl/aws_msk_iam_v2/example_test.go

@@ -0,0 +1,30 @@
+package aws_msk_iam_v2_test
+
+import (
+	"context"
+	"crypto/tls"
+	"time"
+
+	"github.com/aws/aws-sdk-go-v2/config"
+	"github.com/segmentio/kafka-go"
+	"github.com/segmentio/kafka-go/sasl/aws_msk_iam_v2"
+)
+
+func main() {
+	cfg, err := config.LoadDefaultConfig(context.TODO())
+	if err != nil {
+		panic(err)
+	}
+	mechanism := aws_msk_iam_v2.NewMechanism(cfg)
+	_ = kafka.ReaderConfig{
+		Brokers:     []string{"https://localhost"},
+		GroupID:     "some-consumer-group",
+		GroupTopics: []string{"some-topic"},
+		Dialer: &kafka.Dialer{
+			Timeout:       10 * time.Second,
+			DualStack:     true,
+			SASLMechanism: mechanism,
+			TLS:           &tls.Config{},
+		},
+	}
+}

sasl/aws_msk_iam_v2/go.mod

@@ -3,8 +3,9 @@ module github.com/segmentio/kafka-go/sasl/aws_msk_iam_v2
 go 1.15
 
 require (
-	github.com/aws/aws-sdk-go-v2 v1.16.7
-	github.com/aws/aws-sdk-go-v2/credentials v1.12.9
-	github.com/segmentio/kafka-go v0.4.32
-	github.com/stretchr/testify v1.7.1
+	github.com/aws/aws-sdk-go-v2 v1.16.12
+	github.com/aws/aws-sdk-go-v2/config v1.17.2
+	github.com/aws/aws-sdk-go-v2/credentials v1.12.15
+	github.com/segmentio/kafka-go v0.4.34
+	github.com/stretchr/testify v1.8.0
 )

sasl/aws_msk_iam_v2/go.sum

@@ -1,49 +1,69 @@
-github.com/aws/aws-sdk-go-v2 v1.16.7 h1:zfBwXus3u14OszRxGcqCDS4MfMCv10e8SMJ2r8Xm0Ns=
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-github.com/aws/aws-sdk-go-v2/credentials v1.12.9 h1:DloAJr0/jbvm0iVRFDFh8GlWxrOd9XKyX82U+dfVeZs=
-github.com/aws/aws-sdk-go-v2/credentials v1.12.9/go.mod h1:2Vavxl1qqQXJ8MUcQZTsIEW8cwenFCWYXtLRPba3L/o=
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sasl/aws_msk_iam_v2/msk_iam.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"encoding/json"
 	"errors"
-	"fmt"
 	"net/http"
 	"net/url"
 	"runtime"
@@ -32,15 +31,15 @@ const (
 	queryExpiryKey   = "X-Amz-Expires"
 )
 
-var signUserAgent = fmt.Sprintf("kafka-go/sasl/aws_msk_iam/%s", runtime.Version())
+var signUserAgent = "kafka-go/sasl/aws_msk_iam_v2/" + runtime.Version()
 
 // Mechanism implements sasl.Mechanism for the AWS_MSK_IAM mechanism, based on the official java implementation:
 // https://github.com/aws/aws-msk-iam-auth
 type Mechanism struct {
 	// The sigv4.Signer of aws-sdk-go-v2 to use when signing the request. Required.
 	Signer *signer.Signer
-	// The aws.Credentials of aws-sdk-go-v2. Required.
-	Credentials aws.Credentials
+	// The aws.Config.Credentials or config.CredentialsProvider of aws-sdk-go-v2. Required.
+	Credentials aws.CredentialsProvider
 	// The region where the msk cluster is hosted, e.g. "us-east-1". Required.
 	Region string
 	// The time the request is planned for. Optional, defaults to time.Now() at time of authentication.
@@ -62,19 +61,20 @@ func (m *Mechanism) Next(ctx context.Context, challenge []byte) (bool, []byte, e
 
 // Start produces the authentication values required for AWS_MSK_IAM. It produces the following json as a byte array,
 // making use of the aws-sdk to produce the signed output.
-// 	{
-// 	  "version" : "2020_10_22",
-// 	  "host" : "<broker host>",
-// 	  "user-agent": "<user agent string from the client>",
-// 	  "action": "kafka-cluster:Connect",
-// 	  "x-amz-algorithm" : "<algorithm>",
-// 	  "x-amz-credential" : "<clientAWSAccessKeyID>/<date in yyyyMMdd format>/<region>/kafka-cluster/aws4_request",
-// 	  "x-amz-date" : "<timestamp in yyyyMMdd'T'HHmmss'Z' format>",
-// 	  "x-amz-security-token" : "<clientAWSSessionToken if any>",
-// 	  "x-amz-signedheaders" : "host",
-// 	  "x-amz-expires" : "<expiration in seconds>",
-// 	  "x-amz-signature" : "<AWS SigV4 signature computed by the client>"
-// 	}
+//
+//	{
+//	  "version" : "2020_10_22",
+//	  "host" : "<broker host>",
+//	  "user-agent": "<user agent string from the client>",
+//	  "action": "kafka-cluster:Connect",
+//	  "x-amz-algorithm" : "<algorithm>",
+//	  "x-amz-credential" : "<clientAWSAccessKeyID>/<date in yyyyMMdd format>/<region>/kafka-cluster/aws4_request",
+//	  "x-amz-date" : "<timestamp in yyyyMMdd'T'HHmmss'Z' format>",
+//	  "x-amz-security-token" : "<clientAWSSessionToken if any>",
+//	  "x-amz-signedheaders" : "host",
+//	  "x-amz-expires" : "<expiration in seconds>",
+//	  "x-amz-signature" : "<AWS SigV4 signature computed by the client>"
+//	}
 func (m *Mechanism) Start(ctx context.Context) (sess sasl.StateMachine, ir []byte, err error) {
 	signedMap, err := m.preSign(ctx)
 	if err != nil {
@@ -92,7 +92,12 @@ func (m *Mechanism) preSign(ctx context.Context) (map[string]string, error) {
 		return nil, err
 	}
 
-	signedUrl, header, err := m.Signer.PresignHTTP(ctx, m.Credentials, req, signPayload, signService, m.Region, defaultSignTime(m.SignTime))
+	creds, err := m.Credentials.Retrieve(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	signedUrl, header, err := m.Signer.PresignHTTP(ctx, creds, req, signPayload, signService, m.Region, defaultSignTime(m.SignTime))
 	if err != nil {
 		return nil, err
 	}
@@ -164,3 +169,12 @@ func defaultSignTime(v time.Time) time.Time {
 	}
 	return v
 }
+
+// NewMechanism provides
+func NewMechanism(awsCfg aws.Config) *Mechanism {
+	return &Mechanism{
+		Signer:      signer.NewSigner(),
+		Credentials: awsCfg.Credentials,
+		Region:      awsCfg.Region,
+	}
+}

sasl/aws_msk_iam_v2/msk_iam_test.go

@@ -7,11 +7,12 @@ import (
 	"testing"
 	"time"
 
+	"github.com/aws/aws-sdk-go-v2/aws"
 	"github.com/segmentio/kafka-go/sasl"
 	"github.com/stretchr/testify/assert"
 
 	signer "github.com/aws/aws-sdk-go-v2/aws/signer/v4"
-	credentialsv2 "github.com/aws/aws-sdk-go-v2/credentials"
+	"github.com/aws/aws-sdk-go-v2/credentials"
 )
 
 const (
@@ -23,17 +24,12 @@ const (
 var signTime = time.Date(2021, 10, 14, 13, 5, 0, 0, time.UTC)
 
 func TestAwsMskIamMechanism(t *testing.T) {
-	creds, err := credentialsv2.NewStaticCredentialsProvider(accessKeyId, secretAccessKey, "").Retrieve(context.Background())
-	if err != nil {
-		t.Fatal(err)
-	}
-
+	creds := credentials.NewStaticCredentialsProvider(accessKeyId, secretAccessKey, "")
 	ctxWithMetadata := func() context.Context {
 		return sasl.WithMetadata(context.Background(), &sasl.Metadata{
 			Host: "localhost",
 			Port: 9092,
 		})
-
 	}
 
 	tests := []struct {
@@ -64,7 +60,6 @@ func TestAwsMskIamMechanism(t *testing.T) {
 				Region:      "us-east-1",
 				SignTime:    signTime,
 			}
-
 			sess, auth, err := mskMechanism.Start(ctx)
 			if tt.shouldFail { // if error is expected
 				if err == nil { // but we don't find one
@@ -154,3 +149,15 @@ func TestDefaultSignTime(t *testing.T) {
 		})
 	}
 }
+
+func TestNewMechanism(t *testing.T) {
+	region := "us-east-1"
+	creds := credentials.StaticCredentialsProvider{}
+	awsCfg := aws.Config{
+		Region:      region,
+		Credentials: creds,
+	}
+	m := NewMechanism(awsCfg)
+	assert.Equal(t, m.Region, region)
+	assert.Equal(t, m.Credentials, creds)
+}