rbd: add aws-sts-metdata encryption type

With Amazon STS and kubernetes cluster is configured with
OIDC identity provider, credentials to access Amazon KMS
can be fetched using oidc-token(serviceaccount token).
Each tenant/namespace needs to create a secret with aws region,
role and CMK ARN.
Ceph-CSI will assume the given role with oidc token and access
aws KMS, with given CMK to encrypt/decrypt DEK which will stored
in the image metdata.

Refer: https://docs.aws.amazon.com/STS/latest/APIReference/welcome.html
Resolves: #2879

Signed-off-by: Rakshith R <rar@redhat.com>

vendor/github.com/aws/smithy-go/errors.go

@@ -0,0 +1,137 @@
+package smithy
+
+import "fmt"
+
+// APIError provides the generic API and protocol agnostic error type all SDK
+// generated exception types will implement.
+type APIError interface {
+	error
+
+	// ErrorCode returns the error code for the API exception.
+	ErrorCode() string
+	// ErrorMessage returns the error message for the API exception.
+	ErrorMessage() string
+	// ErrorFault returns the fault for the API exception.
+	ErrorFault() ErrorFault
+}
+
+// GenericAPIError provides a generic concrete API error type that SDKs can use
+// to deserialize error responses into. Should be used for unmodeled or untyped
+// errors.
+type GenericAPIError struct {
+	Code    string
+	Message string
+	Fault   ErrorFault
+}
+
+// ErrorCode returns the error code for the API exception.
+func (e *GenericAPIError) ErrorCode() string { return e.Code }
+
+// ErrorMessage returns the error message for the API exception.
+func (e *GenericAPIError) ErrorMessage() string { return e.Message }
+
+// ErrorFault returns the fault for the API exception.
+func (e *GenericAPIError) ErrorFault() ErrorFault { return e.Fault }
+
+func (e *GenericAPIError) Error() string {
+	return fmt.Sprintf("api error %s: %s", e.Code, e.Message)
+}
+
+var _ APIError = (*GenericAPIError)(nil)
+
+// OperationError decorates an underlying error which occurred while invoking
+// an operation with names of the operation and API.
+type OperationError struct {
+	ServiceID     string
+	OperationName string
+	Err           error
+}
+
+// Service returns the name of the API service the error occurred with.
+func (e *OperationError) Service() string { return e.ServiceID }
+
+// Operation returns the name of the API operation the error occurred with.
+func (e *OperationError) Operation() string { return e.OperationName }
+
+// Unwrap returns the nested error if any, or nil.
+func (e *OperationError) Unwrap() error { return e.Err }
+
+func (e *OperationError) Error() string {
+	return fmt.Sprintf("operation error %s: %s, %v", e.ServiceID, e.OperationName, e.Err)
+}
+
+// DeserializationError provides a wrapper for an error that occurs during
+// deserialization.
+type DeserializationError struct {
+	Err      error //  original error
+	Snapshot []byte
+}
+
+// Error returns a formatted error for DeserializationError
+func (e *DeserializationError) Error() string {
+	const msg = "deserialization failed"
+	if e.Err == nil {
+		return msg
+	}
+	return fmt.Sprintf("%s, %v", msg, e.Err)
+}
+
+// Unwrap returns the underlying Error in DeserializationError
+func (e *DeserializationError) Unwrap() error { return e.Err }
+
+// ErrorFault provides the type for a Smithy API error fault.
+type ErrorFault int
+
+// ErrorFault enumeration values
+const (
+	FaultUnknown ErrorFault = iota
+	FaultServer
+	FaultClient
+)
+
+func (f ErrorFault) String() string {
+	switch f {
+	case FaultServer:
+		return "server"
+	case FaultClient:
+		return "client"
+	default:
+		return "unknown"
+	}
+}
+
+// SerializationError represents an error that occurred while attempting to serialize a request
+type SerializationError struct {
+	Err error // original error
+}
+
+// Error returns a formatted error for SerializationError
+func (e *SerializationError) Error() string {
+	const msg = "serialization failed"
+	if e.Err == nil {
+		return msg
+	}
+	return fmt.Sprintf("%s: %v", msg, e.Err)
+}
+
+// Unwrap returns the underlying Error in SerializationError
+func (e *SerializationError) Unwrap() error { return e.Err }
+
+// CanceledError is the error that will be returned by an API request that was
+// canceled. API operations given a Context may return this error when
+// canceled.
+type CanceledError struct {
+	Err error
+}
+
+// CanceledError returns true to satisfy interfaces checking for canceled errors.
+func (*CanceledError) CanceledError() bool { return true }
+
+// Unwrap returns the underlying error, if there was one.
+func (e *CanceledError) Unwrap() error {
+	return e.Err
+}
+
+func (e *CanceledError) Error() string {
+	return fmt.Sprintf("canceled, %v", e.Err)
+}