otelaws created invalid request signatures in v0.36.4

[jamestoyer]

It appears there is an issue with the go.opentelemetry.io/contrib/instrumentation/github.com/aws/aws-sdk-go-v2/otelaws in v0.36.4. After upgrading from v0.36.3 to v0.36.4 in one of our projects we have started to see the following error when accessing DynamoDB:

operation error DynamoDB: Query, https response error StatusCode: 400, RequestID: <request id>, api error InvalidSignatureException: The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details.

Comparing the versions, it appears that #2856 is the only change between the two versions.

Steps to repro

Create a new AWS DynamoDB client and attempt to get an item. In v.0.36.3 this works but in v.0.36.4 this will fail.

Example code:

configOptions := []func(*awsconfig.LoadOptions) error{
  awsconfig.WithRegion("us-east-1"),
}

awsConfig, err := awsconfig.LoadDefaultConfig(ctx, configOptions...)

if err != nil {
  panic(err)
}

otelaws.AppendMiddlewares(&awsConfig.APIOptions)
dynamoDBService = dynamodb.NewFromConfig(awsConfig)

key := make(map[string]types.AttributeValue)
key["partition_key_name"] = &types.AttributeValueMemberS{Value: "partition_key_value"}

input := &dynamodb.GetItemInput{
  TableName: aws.String(<table name>),
  Key:       key.getDynamoDBKey(),
}
result, err := dynamoDBService.GetItem(ctx, input)
if err != nil {
  panic(err)
}

Where partition_key_name is the partition key of a given tale and partition_key_value is the value of an entry for it.

[andrewbenton]

I'm seeing the same issue with v0.36.4 after upgrading from v0.36.2

[lgcmotta]

I having the same problem with v0.38.0 (#3368)