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registry.go
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registry.go
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package registry
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"github.com/dotcloud/docker/auth"
"github.com/dotcloud/docker/utils"
"github.com/shin-/cookiejar"
"io"
"io/ioutil"
"net/http"
"net/url"
"strings"
)
var ErrAlreadyExists = errors.New("Image already exists")
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, authConfig *auth.AuthConfig) bool {
rt := &http.Transport{Proxy: http.ProxyFromEnvironment}
req, err := http.NewRequest("GET", registry+"/images/"+imgId+"/json", nil)
if err != nil {
return false
}
req.SetBasicAuth(authConfig.Username, authConfig.Password)
res, err := rt.RoundTrip(req)
if err != nil {
return false
}
res.Body.Close()
return res.StatusCode == 307
}
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.
// Returns the Image object as well as the layer as an Archive (io.Reader)
func (r *Registry) GetRemoteImageJSON(imgId, registry string, token []string) ([]byte, error) {
// Get the JSON
req, err := http.NewRequest("GET", registry+"/images/"+imgId+"/json", nil)
if err != nil {
return nil, 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, fmt.Errorf("Failed to download json: %s", err)
}
defer res.Body.Close()
if res.StatusCode != 200 {
return nil, fmt.Errorf("HTTP code %d", res.StatusCode)
}
jsonString, err := ioutil.ReadAll(res.Body)
if err != nil {
return nil, fmt.Errorf("Failed to parse downloaded json: %s (%s)", err, jsonString)
}
return jsonString, nil
}
func (r *Registry) GetRemoteImageLayer(imgId, registry string, token []string) (io.ReadCloser, int, error) {
req, err := http.NewRequest("GET", registry+"/images/"+imgId+"/layer", nil)
if err != nil {
return nil, -1, 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, -1, err
}
return res.Body, int(res.ContentLength), 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("https://%s/v1/repositories/%s/tags", host, repository)
req, err := http.NewRequest("GET", endpoint, nil)
if err != nil {
return nil, err
}
req.Header.Set("Authorization", "Token "+strings.Join(token, ", "))
res, err := r.client.Do(req)
utils.Debugf("Got status code %d from %s", res.StatusCode, endpoint)
if err != nil {
return nil, err
}
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 := http.NewRequest("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 = "https://" + 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 = "https://" + 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
}
// push a tag on the registry.
// Remote has the format '<user>/<repo>
func (r *Registry) PushRegistryTag(remote, revision, tag, registry string, token []string) error {
// "jsonify" the string
revision = "\"" + revision + "\""
registry = "https://" + registry + "/v1"
req, err := http.NewRequest("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 := http.NewRequest("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 = http.NewRequest("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) ResetClient(authConfig *auth.AuthConfig) {
r.authConfig = authConfig
r.client.Jar = cookiejar.NewCookieJar()
}
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) *Registry {
httpTransport := &http.Transport{
DisableKeepAlives: true,
Proxy: http.ProxyFromEnvironment,
}
r := &Registry{
authConfig: authConfig,
client: &http.Client{
Transport: httpTransport,
},
}
r.client.Jar = cookiejar.NewCookieJar()
return r
}