package registry import ( "crypto/tls" "fmt" "net/http" "net/url" "strings" "golang.org/x/net/context" "github.com/Sirupsen/logrus" "github.com/docker/docker/reference" "github.com/docker/engine-api/types" registrytypes "github.com/docker/engine-api/types/registry" ) // Service is the interface defining what a registry service should implement. type Service interface { Auth(ctx context.Context, authConfig *types.AuthConfig, userAgent string) (status, token string, err error) LookupPullEndpoints(hostname string) (endpoints []APIEndpoint, err error) LookupPushEndpoints(hostname string) (endpoints []APIEndpoint, err error) ResolveRepository(name reference.Named) (*RepositoryInfo, error) ResolveIndex(name string) (*registrytypes.IndexInfo, error) Search(ctx context.Context, term string, authConfig *types.AuthConfig, userAgent string, headers map[string][]string) (*registrytypes.SearchResults, error) ServiceConfig() *registrytypes.ServiceConfig TLSConfig(hostname string) (*tls.Config, error) } // DefaultService is a registry service. It tracks configuration data such as a list // of mirrors. type DefaultService struct { config *serviceConfig } // NewService returns a new instance of DefaultService ready to be // installed into an engine. func NewService(options ServiceOptions) *DefaultService { return &DefaultService{ config: newServiceConfig(options), } } // ServiceConfig returns the public registry service configuration. func (s *DefaultService) ServiceConfig() *registrytypes.ServiceConfig { return &s.config.ServiceConfig } // Auth contacts the public registry with the provided credentials, // and returns OK if authentication was successful. // It can be used to verify the validity of a client's credentials. func (s *DefaultService) Auth(ctx context.Context, authConfig *types.AuthConfig, userAgent string) (status, token string, err error) { // TODO Use ctx when searching for repositories serverAddress := authConfig.ServerAddress if serverAddress == "" { serverAddress = IndexServer } if !strings.HasPrefix(serverAddress, "https://") && !strings.HasPrefix(serverAddress, "http://") { serverAddress = "https://" + serverAddress } u, err := url.Parse(serverAddress) if err != nil { return "", "", fmt.Errorf("unable to parse server address: %v", err) } endpoints, err := s.LookupPushEndpoints(u.Host) if err != nil { return "", "", err } for _, endpoint := range endpoints { login := loginV2 if endpoint.Version == APIVersion1 { login = loginV1 } status, token, err = login(authConfig, endpoint, userAgent) if err == nil { return } if fErr, ok := err.(fallbackError); ok { err = fErr.err logrus.Infof("Error logging in to %s endpoint, trying next endpoint: %v", endpoint.Version, err) continue } return "", "", err } return "", "", err } // splitReposSearchTerm breaks a search term into an index name and remote name func splitReposSearchTerm(reposName string) (string, string) { nameParts := strings.SplitN(reposName, "/", 2) var indexName, remoteName string if len(nameParts) == 1 || (!strings.Contains(nameParts[0], ".") && !strings.Contains(nameParts[0], ":") && nameParts[0] != "localhost") { // This is a Docker Index repos (ex: samalba/hipache or ubuntu) // 'docker.io' indexName = IndexName remoteName = reposName } else { indexName = nameParts[0] remoteName = nameParts[1] } return indexName, remoteName } // Search queries the public registry for images matching the specified // search terms, and returns the results. func (s *DefaultService) Search(ctx context.Context, term string, authConfig *types.AuthConfig, userAgent string, headers map[string][]string) (*registrytypes.SearchResults, error) { // TODO Use ctx when searching for repositories if err := validateNoScheme(term); err != nil { return nil, err } indexName, remoteName := splitReposSearchTerm(term) index, err := newIndexInfo(s.config, indexName) if err != nil { return nil, err } // *TODO: Search multiple indexes. endpoint, err := NewV1Endpoint(index, userAgent, http.Header(headers)) if err != nil { return nil, err } r, err := NewSession(endpoint.client, authConfig, endpoint) if err != nil { return nil, err } if index.Official { localName := remoteName if strings.HasPrefix(localName, "library/") { // If pull "library/foo", it's stored locally under "foo" localName = strings.SplitN(localName, "/", 2)[1] } return r.SearchRepositories(localName) } return r.SearchRepositories(remoteName) } // ResolveRepository splits a repository name into its components // and configuration of the associated registry. func (s *DefaultService) ResolveRepository(name reference.Named) (*RepositoryInfo, error) { return newRepositoryInfo(s.config, name) } // ResolveIndex takes indexName and returns index info func (s *DefaultService) ResolveIndex(name string) (*registrytypes.IndexInfo, error) { return newIndexInfo(s.config, name) } // APIEndpoint represents a remote API endpoint type APIEndpoint struct { Mirror bool URL *url.URL Version APIVersion Official bool TrimHostname bool TLSConfig *tls.Config } // ToV1Endpoint returns a V1 API endpoint based on the APIEndpoint func (e APIEndpoint) ToV1Endpoint(userAgent string, metaHeaders http.Header) (*V1Endpoint, error) { return newV1Endpoint(*e.URL, e.TLSConfig, userAgent, metaHeaders) } // TLSConfig constructs a client TLS configuration based on server defaults func (s *DefaultService) TLSConfig(hostname string) (*tls.Config, error) { return newTLSConfig(hostname, isSecureIndex(s.config, hostname)) } func (s *DefaultService) tlsConfigForMirror(mirrorURL *url.URL) (*tls.Config, error) { return s.TLSConfig(mirrorURL.Host) } // LookupPullEndpoints creates a list of endpoints to try to pull from, in order of preference. // It gives preference to v2 endpoints over v1, mirrors over the actual // registry, and HTTPS over plain HTTP. func (s *DefaultService) LookupPullEndpoints(hostname string) (endpoints []APIEndpoint, err error) { return s.lookupEndpoints(hostname) } // LookupPushEndpoints creates a list of endpoints to try to push to, in order of preference. // It gives preference to v2 endpoints over v1, and HTTPS over plain HTTP. // Mirrors are not included. func (s *DefaultService) LookupPushEndpoints(hostname string) (endpoints []APIEndpoint, err error) { allEndpoints, err := s.lookupEndpoints(hostname) if err == nil { for _, endpoint := range allEndpoints { if !endpoint.Mirror { endpoints = append(endpoints, endpoint) } } } return endpoints, err } func (s *DefaultService) lookupEndpoints(hostname string) (endpoints []APIEndpoint, err error) { endpoints, err = s.lookupV2Endpoints(hostname) if err != nil { return nil, err } if s.config.V2Only { return endpoints, nil } legacyEndpoints, err := s.lookupV1Endpoints(hostname) if err != nil { return nil, err } endpoints = append(endpoints, legacyEndpoints...) return endpoints, nil }