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error.go
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error.go
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// Copyright 2016 Mender Software AS
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package s3
import (
"encoding/xml"
"net/http"
"github.com/pkg/errors"
)
// getS3Error tries to extract S3 error information from HTTP response. Response
// body is partially consumed. Returns an error with whatever error information returned
// by S3 or just a generic description of a problem in case the response is not
// a correct error response.
//
// See https://docs.aws.amazon.com/AmazonS3/latest/API/ErrorResponses.html for
// example error response returned by S3.
func getS3Error(r *http.Response) error {
s3rsp := struct {
XMLName xml.Name `xml:"Error"`
Code string `xml:"Code"`
Message string `xml:"Message"`
RequestId string `xml:"RequestId"`
Resource string `xml:"Resource"`
}{}
if r.StatusCode < 300 ||
r.Header.Get("Content-Type") != "application/xml" {
return errors.Errorf("unexpected S3 error response, status: %v, type: %s",
r.StatusCode, r.Header.Get("Content-Type"))
}
dec := xml.NewDecoder(r.Body)
err := dec.Decode(&s3rsp)
if err != nil {
return errors.Wrap(err, "failed to decode XML encoded error response")
}
return errors.Errorf("S3 request failed with code %s: %s, request ID: %s",
s3rsp.Code, s3rsp.Message, s3rsp.RequestId)
}