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package common
import (
"fmt"
"log"
"regexp"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/request"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/sts"
)
var encodedFailureMessagePattern = regexp.MustCompile(`(?i)(.*) Encoded authorization failure message: ([\w-]+) ?( .*)?`)
type stsDecoder interface {
DecodeAuthorizationMessage(input *sts.DecodeAuthorizationMessageInput) (*sts.DecodeAuthorizationMessageOutput, error)
}
// decodeError replaces encoded authorization messages with the
// decoded results
func decodeAWSError(decoder stsDecoder, err error) error {
groups := encodedFailureMessagePattern.FindStringSubmatch(err.Error())
if len(groups) > 1 {
result, decodeErr := decoder.DecodeAuthorizationMessage(&sts.DecodeAuthorizationMessageInput{
EncodedMessage: aws.String(groups[2]),
})
if decodeErr == nil {
msg := aws.StringValue(result.DecodedMessage)
return fmt.Errorf("%s Authorization failure message: '%s'%s", groups[1], msg, groups[3])
}
log.Printf("[WARN] Attempted to decode authorization message, but received: %v", decodeErr)
}
return err
}
// DecodeAuthZMessages enables automatic decoding of any
// encoded authorization messages
func DecodeAuthZMessages(sess *session.Session) {
azd := &authZMessageDecoder{
Decoder: sts.New(sess),
}
sess.Handlers.UnmarshalError.AfterEachFn = azd.afterEachFn
}
type authZMessageDecoder struct {
Decoder stsDecoder
}
func (a *authZMessageDecoder) afterEachFn(item request.HandlerListRunItem) bool {
if err, ok := item.Request.Error.(awserr.Error); ok && err.Code() == "UnauthorizedOperation" {
item.Request.Error = decodeAWSError(a.Decoder, err)
}
return true
}
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