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package customizations
import (
"bytes"
"context"
"encoding/xml"
"fmt"
"io"
"io/ioutil"
"strings"
"github.com/aws/smithy-go"
smithyxml "github.com/aws/smithy-go/encoding/xml"
"github.com/aws/smithy-go/middleware"
"github.com/aws/smithy-go/ptr"
smithyhttp "github.com/aws/smithy-go/transport/http"
awsmiddle "github.com/aws/aws-sdk-go-v2/aws/middleware"
"github.com/aws/aws-sdk-go-v2/service/route53/types"
)
// HandleCustomErrorDeserialization check if Route53 response is an error and needs
// custom error deserialization.
func HandleCustomErrorDeserialization(stack *middleware.Stack) error {
return stack.Deserialize.Insert(&processResponse{}, "OperationDeserializer", middleware.After)
}
// middleware to process raw response and look for error response with InvalidChangeBatch error tag
type processResponse struct{}
// ID returns the middleware ID.
func (*processResponse) ID() string {
return "Route53:ProcessResponseForCustomErrorResponse"
}
func (m *processResponse) HandleDeserialize(
ctx context.Context, in middleware.DeserializeInput, next middleware.DeserializeHandler) (
out middleware.DeserializeOutput, metadata middleware.Metadata, err error,
) {
out, metadata, err = next.HandleDeserialize(ctx, in)
if err != nil {
return out, metadata, err
}
response, ok := out.RawResponse.(*smithyhttp.Response)
if !ok {
return out, metadata, &smithy.DeserializationError{Err: fmt.Errorf("unknown transport type %T", out.RawResponse)}
}
// check if success response
if response.StatusCode >= 200 && response.StatusCode < 300 {
return
}
var readBuff bytes.Buffer
body := io.TeeReader(response.Body, &readBuff)
rootDecoder := xml.NewDecoder(body)
t, err := smithyxml.FetchRootElement(rootDecoder)
if err == io.EOF {
return out, metadata, nil
}
// rewind response body
response.Body = ioutil.NopCloser(io.MultiReader(&readBuff, response.Body))
// if start tag is "InvalidChangeBatch", the error response needs custom unmarshaling.
if strings.EqualFold(t.Name.Local, "InvalidChangeBatch") {
return out, metadata, route53CustomErrorDeser(&metadata, response)
}
return out, metadata, err
}
// error type for invalidChangeBatchError
type invalidChangeBatchError struct {
Messages []string `xml:"Messages>Message"`
RequestID string `xml:"RequestId"`
}
func route53CustomErrorDeser(metadata *middleware.Metadata, response *smithyhttp.Response) error {
err := invalidChangeBatchError{}
xml.NewDecoder(response.Body).Decode(&err)
// set request id in metadata
if len(err.RequestID) != 0 {
awsmiddle.SetRequestIDMetadata(metadata, err.RequestID)
}
return &types.InvalidChangeBatch{
Message: ptr.String("ChangeBatch errors occurred"),
Messages: err.Messages,
}
}
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