forked from mirrors/docker-distribution
111 lines
3.2 KiB
Go
111 lines
3.2 KiB
Go
package client
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import (
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"github.com/docker/distribution/registry/api/errcode"
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)
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// ErrNoErrorsInBody is returned when an HTTP response body parses to an empty
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// errcode.Errors slice.
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var ErrNoErrorsInBody = errors.New("no error details found in HTTP response body")
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// UnexpectedHTTPStatusError is returned when an unexpected HTTP status is
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// returned when making a registry api call.
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type UnexpectedHTTPStatusError struct {
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Status string
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}
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func (e *UnexpectedHTTPStatusError) Error() string {
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return fmt.Sprintf("received unexpected HTTP status: %s", e.Status)
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}
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// UnexpectedHTTPResponseError is returned when an expected HTTP status code
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// is returned, but the content was unexpected and failed to be parsed.
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type UnexpectedHTTPResponseError struct {
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ParseErr error
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StatusCode int
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Response []byte
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}
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func (e *UnexpectedHTTPResponseError) Error() string {
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return fmt.Sprintf("error parsing HTTP %d response body: %s: %q", e.StatusCode, e.ParseErr.Error(), string(e.Response))
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}
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func parseHTTPErrorResponse(statusCode int, r io.Reader) error {
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var errors errcode.Errors
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body, err := ioutil.ReadAll(r)
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if err != nil {
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return err
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}
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// For backward compatibility, handle irregularly formatted
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// messages that contain a "details" field.
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var detailsErr struct {
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Details string `json:"details"`
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}
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err = json.Unmarshal(body, &detailsErr)
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if err == nil && detailsErr.Details != "" {
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switch statusCode {
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case http.StatusUnauthorized:
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return errcode.ErrorCodeUnauthorized.WithMessage(detailsErr.Details)
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// FIXME: go1.5 doesn't export http.StatusTooManyRequests while
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// go1.6 does. Update the hardcoded value to the constant once
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// Docker updates golang version to 1.6.
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case 429:
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return errcode.ErrorCodeTooManyRequests.WithMessage(detailsErr.Details)
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default:
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return errcode.ErrorCodeUnknown.WithMessage(detailsErr.Details)
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}
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}
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if err := json.Unmarshal(body, &errors); err != nil {
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return &UnexpectedHTTPResponseError{
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ParseErr: err,
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StatusCode: statusCode,
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Response: body,
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}
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}
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if len(errors) == 0 {
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// If there was no error specified in the body, return
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// UnexpectedHTTPResponseError.
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return &UnexpectedHTTPResponseError{
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ParseErr: ErrNoErrorsInBody,
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StatusCode: statusCode,
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Response: body,
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}
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}
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return errors
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}
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// HandleErrorResponse returns error parsed from HTTP response for an
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// unsuccessful HTTP response code (in the range 400 - 499 inclusive). An
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// UnexpectedHTTPStatusError returned for response code outside of expected
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// range.
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func HandleErrorResponse(resp *http.Response) error {
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if resp.StatusCode == 401 {
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err := parseHTTPErrorResponse(resp.StatusCode, resp.Body)
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if uErr, ok := err.(*UnexpectedHTTPResponseError); ok {
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return errcode.ErrorCodeUnauthorized.WithDetail(uErr.Response)
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}
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return err
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}
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if resp.StatusCode >= 400 && resp.StatusCode < 500 {
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return parseHTTPErrorResponse(resp.StatusCode, resp.Body)
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}
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return &UnexpectedHTTPStatusError{Status: resp.Status}
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}
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// SuccessStatus returns true if the argument is a successful HTTP response
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// code (in the range 200 - 399 inclusive).
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func SuccessStatus(status int) bool {
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return status >= 200 && status <= 399
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}
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