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package docker
import (
"errors"
"fmt"
"net/http"
)
var (
// ErrV1NotSupported is returned when we're trying to talk to a
// docker V1 registry.
ErrV1NotSupported = errors.New("can't talk to a V1 container registry")
// ErrTooManyRequests is returned when the status code returned is 429
ErrTooManyRequests = errors.New("too many requests to registry")
)
// ErrUnauthorizedForCredentials is returned when the status code returned is 401
type ErrUnauthorizedForCredentials struct { // We only use a struct to allow a type assertion, without limiting the contents of the error otherwise.
Err error
}
func (e ErrUnauthorizedForCredentials) Error() string {
return fmt.Sprintf("unable to retrieve auth token: invalid username/password: %s", e.Err.Error())
}
// httpResponseToError translates the https.Response into an error, possibly prefixing it with the supplied context. It returns
// nil if the response is not considered an error.
// NOTE: Almost all callers in this package should use registryHTTPResponseToError instead.
func httpResponseToError(res *http.Response, context string) error {
switch res.StatusCode {
case http.StatusOK:
return nil
case http.StatusTooManyRequests:
return ErrTooManyRequests
case http.StatusUnauthorized:
err := handleErrorResponse(res)
return ErrUnauthorizedForCredentials{Err: err}
default:
if context != "" {
context = context + ": "
}
return fmt.Errorf("%sinvalid status code from registry %d (%s)", context, res.StatusCode, http.StatusText(res.StatusCode))
}
}
// registryHTTPResponseToError creates a Go error from an HTTP error response of a docker/distribution
// registry
func registryHTTPResponseToError(res *http.Response) error {
err := handleErrorResponse(res)
if e, ok := err.(*unexpectedHTTPResponseError); ok {
response := string(e.Response)
if len(response) > 50 {
response = response[:50] + "..."
}
// %.0w makes e visible to error.Unwrap() without including any text
err = fmt.Errorf("StatusCode: %d, %s%.0w", e.StatusCode, response, e)
}
return err
}
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