package registry import ( "bytes" "encoding/json" "errors" "fmt" "github.com/dotcloud/docker/auth" "github.com/dotcloud/docker/utils" "io" "io/ioutil" "net/http" "net/http/cookiejar" "net/url" "regexp" "strconv" "strings" ) var ( ErrAlreadyExists = errors.New("Image already exists") ErrInvalidRepositoryName = errors.New("Invalid repository name (ex: \"registry.domain.tld/myrepos\")") ) func pingRegistryEndpoint(endpoint string) error { if endpoint == auth.IndexServerAddress() { // Skip the check, we now this one is valid // (and we never want to fallback to http in case of error) return nil } resp, err := http.Get(endpoint + "_ping") if err != nil { return err } if resp.Header.Get("X-Docker-Registry-Version") == "" { return errors.New("This does not look like a Registry server (\"X-Docker-Registry-Version\" header not found in the response)") } return nil } func validateRepositoryName(repositoryName string) error { var ( namespace string name string ) nameParts := strings.SplitN(repositoryName, "/", 2) if len(nameParts) < 2 { namespace = "library" name = nameParts[0] } else { namespace = nameParts[0] name = nameParts[1] } validNamespace := regexp.MustCompile(`^([a-z0-9_]{4,30})$`) if !validNamespace.MatchString(namespace) { return fmt.Errorf("Invalid namespace name (%s), only [a-z0-9_] are allowed, size between 4 and 30", namespace) } validRepo := regexp.MustCompile(`^([a-zA-Z0-9-_.]+)$`) if !validRepo.MatchString(name) { return fmt.Errorf("Invalid repository name (%s), only [a-zA-Z0-9-_.] are allowed", name) } return nil } // Resolves a repository name to a endpoint + name func ResolveRepositoryName(reposName string) (string, string, error) { if strings.Contains(reposName, "://") { // It cannot contain a scheme! return "", "", ErrInvalidRepositoryName } nameParts := strings.SplitN(reposName, "/", 2) if !strings.Contains(nameParts[0], ".") && !strings.Contains(nameParts[0], ":") { // This is a Docker Index repos (ex: samalba/hipache or ubuntu) err := validateRepositoryName(reposName) return auth.IndexServerAddress(), reposName, err } if len(nameParts) < 2 { // There is a dot in repos name (and no registry address) // Is it a Registry address without repos name? return "", "", ErrInvalidRepositoryName } hostname := nameParts[0] reposName = nameParts[1] if strings.Contains(hostname, "index.docker.io") { return "", "", fmt.Errorf("Invalid repository name, try \"%s\" instead", reposName) } if err := validateRepositoryName(reposName); err != nil { return "", "", err } endpoint := fmt.Sprintf("https://%s/v1/", hostname) if err := pingRegistryEndpoint(endpoint); err != nil { utils.Debugf("Registry %s does not work (%s), falling back to http", endpoint, err) endpoint = fmt.Sprintf("http://%s/v1/", hostname) if err = pingRegistryEndpoint(endpoint); err != nil { //TODO: triggering highland build can be done there without "failing" return "", "", errors.New("Invalid Registry endpoint: " + err.Error()) } } err := validateRepositoryName(reposName) return endpoint, reposName, err } // VersionInfo is used to model entities which has a version. // It is basically a tupple with name and version. type VersionInfo interface { Name() string Version() string } func doWithCookies(c *http.Client, req *http.Request) (*http.Response, error) { for _, cookie := range c.Jar.Cookies(req.URL) { req.AddCookie(cookie) } res, err := c.Do(req) if err != nil { return nil, err } if len(res.Cookies()) > 0 { c.Jar.SetCookies(req.URL, res.Cookies()) } return res, err } // Set the user agent field in the header based on the versions provided // in NewRegistry() and extra. func (r *Registry) setUserAgent(req *http.Request, extra ...VersionInfo) { if len(r.baseVersions)+len(extra) == 0 { return } if len(extra) == 0 { req.Header.Set("User-Agent", r.baseVersionsStr) } else { req.Header.Set("User-Agent", appendVersions(r.baseVersionsStr, extra...)) } return } // Retrieve the history of a given image from the Registry. // Return a list of the parent's json (requested image included) func (r *Registry) GetRemoteHistory(imgID, registry string, token []string) ([]string, error) { req, err := http.NewRequest("GET", registry+"images/"+imgID+"/ancestry", nil) if err != nil { return nil, err } req.Header.Set("Authorization", "Token "+strings.Join(token, ", ")) r.setUserAgent(req) res, err := doWithCookies(r.client, req) if err != nil || res.StatusCode != 200 { if res != nil { return nil, utils.NewHTTPRequestError(fmt.Sprintf("Internal server error: %d trying to fetch remote history for %s", res.StatusCode, imgID), res) } return nil, err } defer res.Body.Close() jsonString, err := ioutil.ReadAll(res.Body) if err != nil { return nil, fmt.Errorf("Error while reading the http response: %s", err) } utils.Debugf("Ancestry: %s", jsonString) history := new([]string) if err := json.Unmarshal(jsonString, history); err != nil { return nil, err } return *history, nil } // Check if an image exists in the Registry func (r *Registry) LookupRemoteImage(imgID, registry string, token []string) bool { rt := &http.Transport{Proxy: http.ProxyFromEnvironment} req, err := http.NewRequest("GET", registry+"images/"+imgID+"/json", nil) if err != nil { return false } res, err := rt.RoundTrip(req) if err != nil { return false } res.Body.Close() return res.StatusCode == 200 } // Retrieve an image from the Registry. func (r *Registry) GetRemoteImageJSON(imgID, registry string, token []string) ([]byte, int, error) { // Get the JSON req, err := http.NewRequest("GET", registry+"images/"+imgID+"/json", nil) if err != nil { return nil, -1, fmt.Errorf("Failed to download json: %s", err) } req.Header.Set("Authorization", "Token "+strings.Join(token, ", ")) r.setUserAgent(req) res, err := doWithCookies(r.client, req) if err != nil { return nil, -1, fmt.Errorf("Failed to download json: %s", err) } defer res.Body.Close() if res.StatusCode != 200 { return nil, -1, utils.NewHTTPRequestError(fmt.Sprintf("HTTP code %d", res.StatusCode), res) } imageSize, err := strconv.Atoi(res.Header.Get("X-Docker-Size")) if err != nil { return nil, -1, err } jsonString, err := ioutil.ReadAll(res.Body) if err != nil { return nil, -1, fmt.Errorf("Failed to parse downloaded json: %s (%s)", err, jsonString) } return jsonString, imageSize, nil } func (r *Registry) GetRemoteImageLayer(imgID, registry string, token []string) (io.ReadCloser, error) { req, err := http.NewRequest("GET", registry+"images/"+imgID+"/layer", nil) if err != nil { return nil, fmt.Errorf("Error while getting from the server: %s\n", err) } req.Header.Set("Authorization", "Token "+strings.Join(token, ", ")) r.setUserAgent(req) res, err := doWithCookies(r.client, req) if err != nil { return nil, err } return res.Body, nil } func (r *Registry) GetRemoteTags(registries []string, repository string, token []string) (map[string]string, error) { if strings.Count(repository, "/") == 0 { // This will be removed once the Registry supports auto-resolution on // the "library" namespace repository = "library/" + repository } for _, host := range registries { endpoint := fmt.Sprintf("%srepositories/%s/tags", host, repository) req, err := r.opaqueRequest("GET", endpoint, nil) if err != nil { return nil, err } req.Header.Set("Authorization", "Token "+strings.Join(token, ", ")) r.setUserAgent(req) res, err := doWithCookies(r.client, req) if err != nil { return nil, err } utils.Debugf("Got status code %d from %s", res.StatusCode, endpoint) defer res.Body.Close() if res.StatusCode != 200 && res.StatusCode != 404 { continue } else if res.StatusCode == 404 { return nil, fmt.Errorf("Repository not found") } result := make(map[string]string) rawJSON, err := ioutil.ReadAll(res.Body) if err != nil { return nil, err } if err := json.Unmarshal(rawJSON, &result); err != nil { return nil, err } return result, nil } return nil, fmt.Errorf("Could not reach any registry endpoint") } func (r *Registry) GetRepositoryData(indexEp, remote string) (*RepositoryData, error) { repositoryTarget := fmt.Sprintf("%srepositories/%s/images", indexEp, remote) utils.Debugf("[registry] Calling GET %s", repositoryTarget) req, err := r.opaqueRequest("GET", repositoryTarget, nil) if err != nil { return nil, err } if r.authConfig != nil && len(r.authConfig.Username) > 0 { req.SetBasicAuth(r.authConfig.Username, r.authConfig.Password) } req.Header.Set("X-Docker-Token", "true") r.setUserAgent(req) res, err := r.client.Do(req) if err != nil { return nil, err } defer res.Body.Close() if res.StatusCode == 401 { return nil, utils.NewHTTPRequestError(fmt.Sprintf("Please login first (HTTP code %d)", res.StatusCode), res) } // TODO: Right now we're ignoring checksums in the response body. // In the future, we need to use them to check image validity. if res.StatusCode != 200 { return nil, utils.NewHTTPRequestError(fmt.Sprintf("HTTP code: %d", res.StatusCode), res) } var tokens []string if res.Header.Get("X-Docker-Token") != "" { tokens = res.Header["X-Docker-Token"] } var endpoints []string var urlScheme = indexEp[:strings.Index(indexEp, ":")] if res.Header.Get("X-Docker-Endpoints") != "" { // The Registry's URL scheme has to match the Index' for _, ep := range res.Header["X-Docker-Endpoints"] { endpoints = append(endpoints, fmt.Sprintf("%s://%s/v1/", urlScheme, ep)) } } else { return nil, fmt.Errorf("Index response didn't contain any endpoints") } checksumsJSON, err := ioutil.ReadAll(res.Body) if err != nil { return nil, err } remoteChecksums := []*ImgData{} if err := json.Unmarshal(checksumsJSON, &remoteChecksums); err != nil { return nil, err } // Forge a better object from the retrieved data imgsData := make(map[string]*ImgData) for _, elem := range remoteChecksums { imgsData[elem.ID] = elem } return &RepositoryData{ ImgList: imgsData, Endpoints: endpoints, Tokens: tokens, }, nil } func (r *Registry) PushImageChecksumRegistry(imgData *ImgData, registry string, token []string) error { utils.Debugf("[registry] Calling PUT %s", registry+"images/"+imgData.ID+"/checksum") req, err := http.NewRequest("PUT", registry+"images/"+imgData.ID+"/checksum", nil) if err != nil { return err } req.Header.Set("Authorization", "Token "+strings.Join(token, ",")) req.Header.Set("X-Docker-Checksum", imgData.Checksum) res, err := doWithCookies(r.client, req) if err != nil { return fmt.Errorf("Failed to upload metadata: %s", err) } defer res.Body.Close() if len(res.Cookies()) > 0 { r.client.Jar.SetCookies(req.URL, res.Cookies()) } if res.StatusCode != 200 { errBody, err := ioutil.ReadAll(res.Body) if err != nil { return fmt.Errorf("HTTP code %d while uploading metadata and error when trying to parse response body: %s", res.StatusCode, err) } var jsonBody map[string]string if err := json.Unmarshal(errBody, &jsonBody); err != nil { errBody = []byte(err.Error()) } else if jsonBody["error"] == "Image already exists" { return ErrAlreadyExists } return fmt.Errorf("HTTP code %d while uploading metadata: %s", res.StatusCode, errBody) } return nil } // Push a local image to the registry func (r *Registry) PushImageJSONRegistry(imgData *ImgData, jsonRaw []byte, registry string, token []string) error { utils.Debugf("[registry] Calling PUT %s", registry+"images/"+imgData.ID+"/json") req, err := http.NewRequest("PUT", registry+"images/"+imgData.ID+"/json", bytes.NewReader(jsonRaw)) if err != nil { return err } req.Header.Add("Content-type", "application/json") req.Header.Set("Authorization", "Token "+strings.Join(token, ",")) r.setUserAgent(req) res, err := doWithCookies(r.client, req) if err != nil { return fmt.Errorf("Failed to upload metadata: %s", err) } defer res.Body.Close() if res.StatusCode != 200 { errBody, err := ioutil.ReadAll(res.Body) if err != nil { return utils.NewHTTPRequestError(fmt.Sprint("HTTP code %d while uploading metadata and error when trying to parse response body: %s", res.StatusCode, err), res) } var jsonBody map[string]string if err := json.Unmarshal(errBody, &jsonBody); err != nil { errBody = []byte(err.Error()) } else if jsonBody["error"] == "Image already exists" { return ErrAlreadyExists } return utils.NewHTTPRequestError(fmt.Sprintf("HTTP code %d while uploading metadata: %s", res.StatusCode, errBody), res) } return nil } func (r *Registry) PushImageLayerRegistry(imgID string, layer io.Reader, registry string, token []string, jsonRaw []byte) (checksum string, err error) { utils.Debugf("[registry] Calling PUT %s", registry+"images/"+imgID+"/layer") tarsumLayer := &utils.TarSum{Reader: layer} req, err := http.NewRequest("PUT", registry+"images/"+imgID+"/layer", tarsumLayer) if err != nil { return "", err } req.ContentLength = -1 req.TransferEncoding = []string{"chunked"} req.Header.Set("Authorization", "Token "+strings.Join(token, ",")) r.setUserAgent(req) res, err := doWithCookies(r.client, req) if err != nil { return "", fmt.Errorf("Failed to upload layer: %s", err) } defer res.Body.Close() if res.StatusCode != 200 { errBody, err := ioutil.ReadAll(res.Body) if err != nil { return "", utils.NewHTTPRequestError(fmt.Sprintf("HTTP code %d while uploading metadata and error when trying to parse response body: %s", res.StatusCode, err), res) } return "", utils.NewHTTPRequestError(fmt.Sprintf("Received HTTP code %d while uploading layer: %s", res.StatusCode, errBody), res) } return tarsumLayer.Sum(jsonRaw), nil } func (r *Registry) opaqueRequest(method, urlStr string, body io.Reader) (*http.Request, error) { req, err := http.NewRequest(method, urlStr, body) if err != nil { return nil, err } req.URL.Opaque = strings.Replace(urlStr, req.URL.Scheme+":", "", 1) return req, err } // push a tag on the registry. // Remote has the format '/ func (r *Registry) PushRegistryTag(remote, revision, tag, registry string, token []string) error { // "jsonify" the string revision = "\"" + revision + "\"" req, err := r.opaqueRequest("PUT", registry+"repositories/"+remote+"/tags/"+tag, strings.NewReader(revision)) if err != nil { return err } req.Header.Add("Content-type", "application/json") req.Header.Set("Authorization", "Token "+strings.Join(token, ",")) r.setUserAgent(req) req.ContentLength = int64(len(revision)) res, err := doWithCookies(r.client, req) if err != nil { return err } res.Body.Close() if res.StatusCode != 200 && res.StatusCode != 201 { return utils.NewHTTPRequestError(fmt.Sprintf("Internal server error: %d trying to push tag %s on %s", res.StatusCode, tag, remote), res) } return nil } func (r *Registry) PushImageJSONIndex(indexEp, remote string, imgList []*ImgData, validate bool, regs []string) (*RepositoryData, error) { cleanImgList := []*ImgData{} if validate { for _, elem := range imgList { if elem.Checksum != "" { cleanImgList = append(cleanImgList, elem) } } } else { cleanImgList = imgList } imgListJSON, err := json.Marshal(cleanImgList) if err != nil { return nil, err } var suffix string if validate { suffix = "images" } u := fmt.Sprintf("%srepositories/%s/%s", indexEp, remote, suffix) utils.Debugf("[registry] PUT %s", u) utils.Debugf("Image list pushed to index:\n%s\n", imgListJSON) req, err := r.opaqueRequest("PUT", u, bytes.NewReader(imgListJSON)) if err != nil { return nil, err } req.SetBasicAuth(r.authConfig.Username, r.authConfig.Password) req.ContentLength = int64(len(imgListJSON)) req.Header.Set("X-Docker-Token", "true") r.setUserAgent(req) if validate { req.Header["X-Docker-Endpoints"] = regs } res, err := r.client.Do(req) if err != nil { return nil, err } defer res.Body.Close() // Redirect if necessary for res.StatusCode >= 300 && res.StatusCode < 400 { utils.Debugf("Redirected to %s\n", res.Header.Get("Location")) req, err = r.opaqueRequest("PUT", res.Header.Get("Location"), bytes.NewReader(imgListJSON)) if err != nil { return nil, err } req.SetBasicAuth(r.authConfig.Username, r.authConfig.Password) req.ContentLength = int64(len(imgListJSON)) req.Header.Set("X-Docker-Token", "true") r.setUserAgent(req) if validate { req.Header["X-Docker-Endpoints"] = regs } res, err = r.client.Do(req) if err != nil { return nil, err } defer res.Body.Close() } var tokens, endpoints []string var urlScheme = indexEp[:strings.Index(indexEp, ":")] if !validate { if res.StatusCode != 200 && res.StatusCode != 201 { errBody, err := ioutil.ReadAll(res.Body) if err != nil { return nil, err } return nil, utils.NewHTTPRequestError(fmt.Sprintf("Error: Status %d trying to push repository %s: %s", res.StatusCode, remote, errBody), res) } if res.Header.Get("X-Docker-Token") != "" { tokens = res.Header["X-Docker-Token"] utils.Debugf("Auth token: %v", tokens) } else { return nil, fmt.Errorf("Index response didn't contain an access token") } if res.Header.Get("X-Docker-Endpoints") != "" { // The Registry's URL scheme has to match the Index' for _, ep := range res.Header["X-Docker-Endpoints"] { endpoints = append(endpoints, fmt.Sprintf("%s://%s/v1/", urlScheme, ep)) } } else { return nil, fmt.Errorf("Index response didn't contain any endpoints") } } if validate { if res.StatusCode != 204 { errBody, err := ioutil.ReadAll(res.Body) if err != nil { return nil, err } return nil, utils.NewHTTPRequestError(fmt.Sprintf("Error: Status %d trying to push checksums %s: %s", res.StatusCode, remote, errBody), res) } } return &RepositoryData{ Tokens: tokens, Endpoints: endpoints, }, nil } func (r *Registry) SearchRepositories(term string) (*SearchResults, error) { u := auth.IndexServerAddress() + "search?q=" + url.QueryEscape(term) req, err := http.NewRequest("GET", u, nil) if err != nil { return nil, err } res, err := r.client.Do(req) if err != nil { return nil, err } defer res.Body.Close() if res.StatusCode != 200 { return nil, utils.NewHTTPRequestError(fmt.Sprintf("Unexepected status code %d", res.StatusCode), res) } rawData, err := ioutil.ReadAll(res.Body) if err != nil { return nil, err } result := new(SearchResults) err = json.Unmarshal(rawData, result) return result, err } func (r *Registry) GetAuthConfig(withPasswd bool) *auth.AuthConfig { password := "" if withPasswd { password = r.authConfig.Password } return &auth.AuthConfig{ Username: r.authConfig.Username, Password: password, Email: r.authConfig.Email, } } type SearchResults struct { Query string `json:"query"` NumResults int `json:"num_results"` Results []map[string]string `json:"results"` } type RepositoryData struct { ImgList map[string]*ImgData Endpoints []string Tokens []string } type ImgData struct { ID string `json:"id"` Checksum string `json:"checksum,omitempty"` Tag string `json:",omitempty"` } type Registry struct { client *http.Client authConfig *auth.AuthConfig baseVersions []VersionInfo baseVersionsStr string } func validVersion(version VersionInfo) bool { stopChars := " \t\r\n/" if strings.ContainsAny(version.Name(), stopChars) { return false } if strings.ContainsAny(version.Version(), stopChars) { return false } return true } // Convert versions to a string and append the string to the string base. // // Each VersionInfo will be converted to a string in the format of // "product/version", where the "product" is get from the Name() method, while // version is get from the Version() method. Several pieces of verson information // will be concatinated and separated by space. func appendVersions(base string, versions ...VersionInfo) string { if len(versions) == 0 { return base } var buf bytes.Buffer if len(base) > 0 { buf.Write([]byte(base)) } for _, v := range versions { if !validVersion(v) { continue } buf.Write([]byte(v.Name())) buf.Write([]byte("/")) buf.Write([]byte(v.Version())) buf.Write([]byte(" ")) } return buf.String() } func NewRegistry(root string, authConfig *auth.AuthConfig, baseVersions ...VersionInfo) (r *Registry, err error) { httpTransport := &http.Transport{ DisableKeepAlives: true, Proxy: http.ProxyFromEnvironment, } r = &Registry{ authConfig: authConfig, client: &http.Client{ Transport: httpTransport, }, } r.client.Jar, err = cookiejar.New(nil) if err != nil { return nil, err } r.baseVersions = baseVersions r.baseVersionsStr = appendVersions("", baseVersions...) return r, nil }