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package s3shared
import (
"encoding/xml"
"fmt"
"io"
"net/http"
"strings"
)
// ErrorComponents represents the error response fields
// that will be deserialized from an xml error response body
type ErrorComponents struct {
Code string `xml:"Code"`
Message string `xml:"Message"`
RequestID string `xml:"RequestId"`
HostID string `xml:"HostId"`
}
// GetUnwrappedErrorResponseComponents returns the error fields from an xml error response body
func GetUnwrappedErrorResponseComponents(r io.Reader) (ErrorComponents, error) {
var errComponents ErrorComponents
if err := xml.NewDecoder(r).Decode(&errComponents); err != nil && err != io.EOF {
return ErrorComponents{}, fmt.Errorf("error while deserializing xml error response : %w", err)
}
return errComponents, nil
}
// GetWrappedErrorResponseComponents returns the error fields from an xml error response body
// in which error code, and message are wrapped by a <Error> tag
func GetWrappedErrorResponseComponents(r io.Reader) (ErrorComponents, error) {
var errComponents struct {
Code string `xml:"Error>Code"`
Message string `xml:"Error>Message"`
RequestID string `xml:"RequestId"`
HostID string `xml:"HostId"`
}
if err := xml.NewDecoder(r).Decode(&errComponents); err != nil && err != io.EOF {
return ErrorComponents{}, fmt.Errorf("error while deserializing xml error response : %w", err)
}
return ErrorComponents{
Code: errComponents.Code,
Message: errComponents.Message,
RequestID: errComponents.RequestID,
HostID: errComponents.HostID,
}, nil
}
// GetErrorResponseComponents retrieves error components according to passed in options
func GetErrorResponseComponents(r io.Reader, options ErrorResponseDeserializerOptions) (ErrorComponents, error) {
var errComponents ErrorComponents
var err error
if options.IsWrappedWithErrorTag {
errComponents, err = GetWrappedErrorResponseComponents(r)
} else {
errComponents, err = GetUnwrappedErrorResponseComponents(r)
}
if err != nil {
return ErrorComponents{}, err
}
// If an error code or message is not retrieved, it is derived from the http status code
// eg, for S3 service, we derive err code and message, if none is found
if options.UseStatusCode && len(errComponents.Code) == 0 &&
len(errComponents.Message) == 0 {
// derive code and message from status code
statusText := http.StatusText(options.StatusCode)
errComponents.Code = strings.Replace(statusText, " ", "", -1)
errComponents.Message = statusText
}
return errComponents, nil
}
// ErrorResponseDeserializerOptions represents error response deserializer options for s3 and s3-control service
type ErrorResponseDeserializerOptions struct {
// UseStatusCode denotes if status code should be used to retrieve error code, msg
UseStatusCode bool
// StatusCode is status code of error response
StatusCode int
//IsWrappedWithErrorTag represents if error response's code, msg is wrapped within an
// additional <Error> tag
IsWrappedWithErrorTag bool
}
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