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package s3
import (
"bytes"
"encoding/xml"
"fmt"
"io"
"io/ioutil"
"net/http"
"strings"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/request"
"github.com/aws/aws-sdk-go/private/protocol/xml/xmlutil"
)
type xmlErrorResponse struct {
XMLName xml.Name `xml:"Error"`
Code string `xml:"Code"`
Message string `xml:"Message"`
}
func unmarshalError(r *request.Request) {
defer r.HTTPResponse.Body.Close()
defer io.Copy(ioutil.Discard, r.HTTPResponse.Body)
// Bucket exists in a different region, and request needs
// to be made to the correct region.
if r.HTTPResponse.StatusCode == http.StatusMovedPermanently {
msg := fmt.Sprintf(
"incorrect region, the bucket is not in '%s' region at endpoint '%s'",
aws.StringValue(r.Config.Region),
aws.StringValue(r.Config.Endpoint),
)
if v := r.HTTPResponse.Header.Get("x-amz-bucket-region"); len(v) != 0 {
msg += fmt.Sprintf(", bucket is in '%s' region", v)
}
r.Error = awserr.NewRequestFailure(
awserr.New("BucketRegionError", msg, nil),
r.HTTPResponse.StatusCode,
r.RequestID,
)
return
}
// Attempt to parse error from body if it is known
var errResp xmlErrorResponse
var err error
if r.HTTPResponse.StatusCode >= 200 && r.HTTPResponse.StatusCode < 300 {
err = s3unmarshalXMLError(&errResp, r.HTTPResponse.Body)
} else {
err = xmlutil.UnmarshalXMLError(&errResp, r.HTTPResponse.Body)
}
if err != nil {
var errorMsg string
if err == io.EOF {
errorMsg = "empty response payload"
} else {
errorMsg = "failed to unmarshal error message"
}
r.Error = awserr.NewRequestFailure(
awserr.New(request.ErrCodeSerialization,
errorMsg, err),
r.HTTPResponse.StatusCode,
r.RequestID,
)
return
}
// Fallback to status code converted to message if still no error code
if len(errResp.Code) == 0 {
statusText := http.StatusText(r.HTTPResponse.StatusCode)
errResp.Code = strings.Replace(statusText, " ", "", -1)
errResp.Message = statusText
}
r.Error = awserr.NewRequestFailure(
awserr.New(errResp.Code, errResp.Message, err),
r.HTTPResponse.StatusCode,
r.RequestID,
)
}
// A RequestFailure provides access to the S3 Request ID and Host ID values
// returned from API operation errors. Getting the error as a string will
// return the formated error with the same information as awserr.RequestFailure,
// while also adding the HostID value from the response.
type RequestFailure interface {
awserr.RequestFailure
// Host ID is the S3 Host ID needed for debug, and contacting support
HostID() string
}
// s3unmarshalXMLError is s3 specific xml error unmarshaler
// for 200 OK errors and response payloads.
// This function differs from the xmlUtil.UnmarshalXMLError
// func. It does not ignore the EOF error and passes it up.
// Related to bug fix for `s3 200 OK response with empty payload`
func s3unmarshalXMLError(v interface{}, stream io.Reader) error {
var errBuf bytes.Buffer
body := io.TeeReader(stream, &errBuf)
err := xml.NewDecoder(body).Decode(v)
if err != nil && err != io.EOF {
return awserr.NewUnmarshalError(err,
"failed to unmarshal error message", errBuf.Bytes())
}
return err
}