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" "strconv" "strings" ) var ErrAlreadyExists = errors.New("Image already exists") func UrlScheme() string { u, err := url.Parse(auth.IndexServerAddress()) if err != nil { return "https" } return u.Scheme } func doWithCookies(c *http.Client, req *http.Request) (*http.Response, error) { for _, cookie := range c.Jar.Cookies(req.URL) { req.AddCookie(cookie) } return c.Do(req) } // 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, ", ")) res, err := r.client.Do(req) if err != nil || res.StatusCode != 200 { if res != nil { return nil, fmt.Errorf("Internal server error: %d trying to fetch remote history for %s", res.StatusCode, imgId) } 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+"/v1/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 } func (r *Registry) getImagesInRepository(repository string, authConfig *auth.AuthConfig) ([]map[string]string, error) { u := auth.IndexServerAddress() + "/repositories/" + repository + "/images" req, err := http.NewRequest("GET", u, nil) if err != nil { return nil, err } if authConfig != nil && len(authConfig.Username) > 0 { req.SetBasicAuth(authConfig.Username, authConfig.Password) } res, err := r.client.Do(req) if err != nil { return nil, err } defer res.Body.Close() // Repository doesn't exist yet if res.StatusCode == 404 { return nil, nil } jsonData, err := ioutil.ReadAll(res.Body) if err != nil { return nil, err } imageList := []map[string]string{} if err := json.Unmarshal(jsonData, &imageList); err != nil { utils.Debugf("Body: %s (%s)\n", res.Body, u) return nil, err } return imageList, nil } // 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, ", ")) res, err := r.client.Do(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, fmt.Errorf("HTTP code %d", res.StatusCode) } 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, ", ")) res, err := r.client.Do(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("%s/v1/repositories/%s/tags", host, repository) if !(strings.HasPrefix(endpoint, "http://") || strings.HasPrefix(endpoint, "https://")) { endpoint = fmt.Sprintf("%s://%s", UrlScheme(), endpoint) } req, err := r.opaqueRequest("GET", endpoint, nil) if err != nil { return nil, err } req.Header.Set("Authorization", "Token "+strings.Join(token, ", ")) res, err := r.client.Do(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(remote string) (*RepositoryData, error) { repositoryTarget := auth.IndexServerAddress() + "/repositories/" + remote + "/images" 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") res, err := r.client.Do(req) if err != nil { return nil, err } defer res.Body.Close() if res.StatusCode == 401 { return nil, fmt.Errorf("Please login first (HTTP code %d)", res.StatusCode) } // 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, fmt.Errorf("HTTP code: %d", res.StatusCode) } var tokens []string if res.Header.Get("X-Docker-Token") != "" { tokens = res.Header["X-Docker-Token"] } var endpoints []string if res.Header.Get("X-Docker-Endpoints") != "" { endpoints = res.Header["X-Docker-Endpoints"] } 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 } // Push a local image to the registry func (r *Registry) PushImageJSONRegistry(imgData *ImgData, jsonRaw []byte, registry string, token []string) error { registry = registry + "/v1" // FIXME: try json with UTF8 req, err := http.NewRequest("PUT", registry+"/images/"+imgData.ID+"/json", strings.NewReader(string(jsonRaw))) if err != nil { return err } req.Header.Add("Content-type", "application/json") req.Header.Set("Authorization", "Token "+strings.Join(token, ",")) req.Header.Set("X-Docker-Checksum", imgData.Checksum) utils.Debugf("Setting checksum for %s: %s", imgData.ID, 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 } func (r *Registry) PushImageLayerRegistry(imgId string, layer io.Reader, registry string, token []string) error { registry = registry + "/v1" req, err := http.NewRequest("PUT", registry+"/images/"+imgId+"/layer", layer) if err != nil { return err } req.ContentLength = -1 req.TransferEncoding = []string{"chunked"} req.Header.Set("Authorization", "Token "+strings.Join(token, ",")) 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 fmt.Errorf("HTTP code %d while uploading metadata and error when trying to parse response body: %s", res.StatusCode, err) } return fmt.Errorf("Received HTTP code %d while uploading layer: %s", res.StatusCode, errBody) } return 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 + "\"" registry = registry + "/v1" 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, ",")) 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 fmt.Errorf("Internal server error: %d trying to push tag %s on %s", res.StatusCode, tag, remote) } return nil } func (r *Registry) PushImageJSONIndex(remote string, imgList []*ImgData, validate bool, regs []string) (*RepositoryData, error) { imgListJSON, err := json.Marshal(imgList) if err != nil { return nil, err } var suffix string if validate { suffix = "images" } utils.Debugf("Image list pushed to index:\n%s\n", imgListJSON) req, err := r.opaqueRequest("PUT", auth.IndexServerAddress()+"/repositories/"+remote+"/"+suffix, 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") 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") 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 if !validate { if res.StatusCode != 200 && res.StatusCode != 201 { errBody, err := ioutil.ReadAll(res.Body) if err != nil { return nil, err } return nil, fmt.Errorf("Error: Status %d trying to push repository %s: %s", res.StatusCode, remote, errBody) } 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") != "" { endpoints = res.Header["X-Docker-Endpoints"] } 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, fmt.Errorf("Error: Status %d trying to push checksums %s: %s", res.StatusCode, remote, errBody) } } 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, fmt.Errorf("Unexepected status code %d", res.StatusCode) } 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 } func NewRegistry(root string, authConfig *auth.AuthConfig) (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) return r, err }