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package registry
import (
"crypto/tls"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"strings"
"github.com/Sirupsen/logrus"
"github.com/docker/distribution/registry/client/transport"
registrytypes "github.com/docker/docker/api/types/registry"
)
// V1Endpoint stores basic information about a V1 registry endpoint.
type V1Endpoint struct {
client *http.Client
URL *url.URL
IsSecure bool
}
// NewV1Endpoint parses the given address to return a registry endpoint.
func NewV1Endpoint(index *registrytypes.IndexInfo, userAgent string, metaHeaders http.Header) (*V1Endpoint, error) {
tlsConfig, err := newTLSConfig(index.Name, index.Secure)
if err != nil {
return nil, err
}
endpoint, err := newV1EndpointFromStr(GetAuthConfigKey(index), tlsConfig, userAgent, metaHeaders)
if err != nil {
return nil, err
}
if err := validateEndpoint(endpoint); err != nil {
return nil, err
}
return endpoint, nil
}
func validateEndpoint(endpoint *V1Endpoint) error {
logrus.Debugf("pinging registry endpoint %s", endpoint)
// Try HTTPS ping to registry
endpoint.URL.Scheme = "https"
if _, err := endpoint.Ping(); err != nil {
if endpoint.IsSecure {
// If registry is secure and HTTPS failed, show user the error and tell them about `--insecure-registry`
// in case that's what they need. DO NOT accept unknown CA certificates, and DO NOT fallback to HTTP.
return fmt.Errorf("invalid registry endpoint %s: %v. If this private registry supports only HTTP or HTTPS with an unknown CA certificate, please add `--insecure-registry %s` to the daemon's arguments. In the case of HTTPS, if you have access to the registry's CA certificate, no need for the flag; simply place the CA certificate at /etc/docker/certs.d/%s/ca.crt", endpoint, err, endpoint.URL.Host, endpoint.URL.Host)
}
// If registry is insecure and HTTPS failed, fallback to HTTP.
logrus.Debugf("Error from registry %q marked as insecure: %v. Insecurely falling back to HTTP", endpoint, err)
endpoint.URL.Scheme = "http"
var err2 error
if _, err2 = endpoint.Ping(); err2 == nil {
return nil
}
return fmt.Errorf("invalid registry endpoint %q. HTTPS attempt: %v. HTTP attempt: %v", endpoint, err, err2)
}
return nil
}
func newV1Endpoint(address url.URL, tlsConfig *tls.Config, userAgent string, metaHeaders http.Header) (*V1Endpoint, error) {
endpoint := &V1Endpoint{
IsSecure: (tlsConfig == nil || !tlsConfig.InsecureSkipVerify),
URL: new(url.URL),
}
*endpoint.URL = address
// TODO(tiborvass): make sure a ConnectTimeout transport is used
tr := NewTransport(tlsConfig)
endpoint.client = HTTPClient(transport.NewTransport(tr, DockerHeaders(userAgent, metaHeaders)...))
return endpoint, nil
}
// trimV1Address trims the version off the address and returns the
// trimmed address or an error if there is a non-V1 version.
func trimV1Address(address string) (string, error) {
var (
chunks []string
apiVersionStr string
)
if strings.HasSuffix(address, "/") {
address = address[:len(address)-1]
}
chunks = strings.Split(address, "/")
apiVersionStr = chunks[len(chunks)-1]
if apiVersionStr == "v1" {
return strings.Join(chunks[:len(chunks)-1], "/"), nil
}
for k, v := range apiVersions {
if k != APIVersion1 && apiVersionStr == v {
return "", fmt.Errorf("unsupported V1 version path %s", apiVersionStr)
}
}
return address, nil
}
func newV1EndpointFromStr(address string, tlsConfig *tls.Config, userAgent string, metaHeaders http.Header) (*V1Endpoint, error) {
if !strings.HasPrefix(address, "http://") && !strings.HasPrefix(address, "https://") {
address = "https://" + address
}
address, err := trimV1Address(address)
if err != nil {
return nil, err
}
uri, err := url.Parse(address)
if err != nil {
return nil, err
}
endpoint, err := newV1Endpoint(*uri, tlsConfig, userAgent, metaHeaders)
if err != nil {
return nil, err
}
return endpoint, nil
}
// Get the formatted URL for the root of this registry Endpoint
func (e *V1Endpoint) String() string {
return e.URL.String() + "/v1/"
}
// Path returns a formatted string for the URL
// of this endpoint with the given path appended.
func (e *V1Endpoint) Path(path string) string {
return e.URL.String() + "/v1/" + path
}
// Ping returns a PingResult which indicates whether the registry is standalone or not.
func (e *V1Endpoint) Ping() (PingResult, error) {
logrus.Debugf("attempting v1 ping for registry endpoint %s", e)
if e.String() == IndexServer {
// Skip the check, we know this one is valid
// (and we never want to fallback to http in case of error)
return PingResult{Standalone: false}, nil
}
req, err := http.NewRequest("GET", e.Path("_ping"), nil)
if err != nil {
return PingResult{Standalone: false}, err
}
resp, err := e.client.Do(req)
if err != nil {
return PingResult{Standalone: false}, err
}
defer resp.Body.Close()
jsonString, err := ioutil.ReadAll(resp.Body)
if err != nil {
return PingResult{Standalone: false}, fmt.Errorf("error while reading the http response: %s", err)
}
// If the header is absent, we assume true for compatibility with earlier
// versions of the registry. default to true
info := PingResult{
Standalone: true,
}
if err := json.Unmarshal(jsonString, &info); err != nil {
logrus.Debugf("Error unmarshalling the _ping PingResult: %s", err)
// don't stop here. Just assume sane defaults
}
if hdr := resp.Header.Get("X-Docker-Registry-Version"); hdr != "" {
logrus.Debugf("Registry version header: '%s'", hdr)
info.Version = hdr
}
logrus.Debugf("PingResult.Version: %q", info.Version)
standalone := resp.Header.Get("X-Docker-Registry-Standalone")
logrus.Debugf("Registry standalone header: '%s'", standalone)
// Accepted values are "true" (case-insensitive) and "1".
if strings.EqualFold(standalone, "true") || standalone == "1" {
info.Standalone = true
} else if len(standalone) > 0 {
// there is a header set, and it is not "true" or "1", so assume fails
info.Standalone = false
}
logrus.Debugf("PingResult.Standalone: %t", info.Standalone)
return info, nil
}
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