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moby--moby/registry/session.go
Derek McGowan c8d2ec93ca Add check for 404 on get repository data
No longer add the body to the error when a 404 is received on get repository data.

closes #11510

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
2015-03-22 18:15:18 -07:00

616 lines
18 KiB
Go

package registry
import (
"bytes"
"crypto/sha256"
// this is required for some certificates
_ "crypto/sha512"
"encoding/hex"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/http/cookiejar"
"net/url"
"strconv"
"strings"
"time"
log "github.com/Sirupsen/logrus"
"github.com/docker/docker/pkg/httputils"
"github.com/docker/docker/pkg/tarsum"
"github.com/docker/docker/utils"
)
type Session struct {
authConfig *AuthConfig
reqFactory *utils.HTTPRequestFactory
indexEndpoint *Endpoint
jar *cookiejar.Jar
timeout TimeoutType
}
func NewSession(authConfig *AuthConfig, factory *utils.HTTPRequestFactory, endpoint *Endpoint, timeout bool) (r *Session, err error) {
r = &Session{
authConfig: authConfig,
indexEndpoint: endpoint,
}
if timeout {
r.timeout = ReceiveTimeout
}
r.jar, err = cookiejar.New(nil)
if err != nil {
return nil, err
}
// If we're working with a standalone private registry over HTTPS, send Basic Auth headers
// alongside our requests.
if r.indexEndpoint.VersionString(1) != IndexServerAddress() && r.indexEndpoint.URL.Scheme == "https" {
info, err := r.indexEndpoint.Ping()
if err != nil {
return nil, err
}
if info.Standalone {
log.Debugf("Endpoint %s is eligible for private registry. Enabling decorator.", r.indexEndpoint.String())
dec := utils.NewHTTPAuthDecorator(authConfig.Username, authConfig.Password)
factory.AddDecorator(dec)
}
}
r.reqFactory = factory
return r, nil
}
func (r *Session) doRequest(req *http.Request) (*http.Response, *http.Client, error) {
return doRequest(req, r.jar, r.timeout, r.indexEndpoint.IsSecure)
}
// Retrieve the history of a given image from the Registry.
// Return a list of the parent's json (requested image included)
func (r *Session) GetRemoteHistory(imgID, registry string, token []string) ([]string, error) {
req, err := r.reqFactory.NewRequest("GET", registry+"images/"+imgID+"/ancestry", nil)
if err != nil {
return nil, err
}
setTokenAuth(req, token)
res, _, err := r.doRequest(req)
if err != nil {
return nil, err
}
defer res.Body.Close()
if res.StatusCode != 200 {
if res.StatusCode == 401 {
return nil, errLoginRequired
}
return nil, utils.NewHTTPRequestError(fmt.Sprintf("Server error: %d trying to fetch remote history for %s", res.StatusCode, imgID), res)
}
jsonString, err := ioutil.ReadAll(res.Body)
if err != nil {
return nil, fmt.Errorf("Error while reading the http response: %s", err)
}
log.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 *Session) LookupRemoteImage(imgID, registry string, token []string) error {
req, err := r.reqFactory.NewRequest("GET", registry+"images/"+imgID+"/json", nil)
if err != nil {
return err
}
setTokenAuth(req, token)
res, _, err := r.doRequest(req)
if err != nil {
return err
}
res.Body.Close()
if res.StatusCode != 200 {
return utils.NewHTTPRequestError(fmt.Sprintf("HTTP code %d", res.StatusCode), res)
}
return nil
}
// Retrieve an image from the Registry.
func (r *Session) GetRemoteImageJSON(imgID, registry string, token []string) ([]byte, int, error) {
// Get the JSON
req, err := r.reqFactory.NewRequest("GET", registry+"images/"+imgID+"/json", nil)
if err != nil {
return nil, -1, fmt.Errorf("Failed to download json: %s", err)
}
setTokenAuth(req, token)
res, _, err := r.doRequest(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)
}
// if the size header is not present, then set it to '-1'
imageSize := -1
if hdr := res.Header.Get("X-Docker-Size"); hdr != "" {
imageSize, err = strconv.Atoi(hdr)
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 *Session) GetRemoteImageLayer(imgID, registry string, token []string, imgSize int64) (io.ReadCloser, error) {
var (
retries = 5
statusCode = 0
client *http.Client
res *http.Response
imageURL = fmt.Sprintf("%simages/%s/layer", registry, imgID)
)
req, err := r.reqFactory.NewRequest("GET", imageURL, nil)
if err != nil {
return nil, fmt.Errorf("Error while getting from the server: %s\n", err)
}
setTokenAuth(req, token)
for i := 1; i <= retries; i++ {
statusCode = 0
res, client, err = r.doRequest(req)
if err != nil {
log.Debugf("Error contacting registry: %s", err)
if res != nil {
if res.Body != nil {
res.Body.Close()
}
statusCode = res.StatusCode
}
if i == retries {
return nil, fmt.Errorf("Server error: Status %d while fetching image layer (%s)",
statusCode, imgID)
}
time.Sleep(time.Duration(i) * 5 * time.Second)
continue
}
break
}
if res.StatusCode != 200 {
res.Body.Close()
return nil, fmt.Errorf("Server error: Status %d while fetching image layer (%s)",
res.StatusCode, imgID)
}
if res.Header.Get("Accept-Ranges") == "bytes" && imgSize > 0 {
log.Debugf("server supports resume")
return httputils.ResumableRequestReaderWithInitialResponse(client, req, 5, imgSize, res), nil
}
log.Debugf("server doesn't support resume")
return res.Body, nil
}
func (r *Session) 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.reqFactory.NewRequest("GET", endpoint, nil)
if err != nil {
return nil, err
}
setTokenAuth(req, token)
res, _, err := r.doRequest(req)
if err != nil {
return nil, err
}
log.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)
if err := json.NewDecoder(res.Body).Decode(&result); err != nil {
return nil, err
}
return result, nil
}
return nil, fmt.Errorf("Could not reach any registry endpoint")
}
func buildEndpointsList(headers []string, indexEp string) ([]string, error) {
var endpoints []string
parsedURL, err := url.Parse(indexEp)
if err != nil {
return nil, err
}
var urlScheme = parsedURL.Scheme
// The Registry's URL scheme has to match the Index'
for _, ep := range headers {
epList := strings.Split(ep, ",")
for _, epListElement := range epList {
endpoints = append(
endpoints,
fmt.Sprintf("%s://%s/v1/", urlScheme, strings.TrimSpace(epListElement)))
}
}
return endpoints, nil
}
func (r *Session) GetRepositoryData(remote string) (*RepositoryData, error) {
repositoryTarget := fmt.Sprintf("%srepositories/%s/images", r.indexEndpoint.VersionString(1), remote)
log.Debugf("[registry] Calling GET %s", repositoryTarget)
req, err := r.reqFactory.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.doRequest(req)
if err != nil {
return nil, err
}
defer res.Body.Close()
if res.StatusCode == 401 {
return nil, errLoginRequired
}
// 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 == 404 {
return nil, utils.NewHTTPRequestError(fmt.Sprintf("HTTP code: %d", res.StatusCode), res)
} else if res.StatusCode != 200 {
errBody, err := ioutil.ReadAll(res.Body)
if err != nil {
log.Debugf("Error reading response body: %s", err)
}
return nil, utils.NewHTTPRequestError(fmt.Sprintf("Error: Status %d trying to pull repository %s: %q", res.StatusCode, remote, errBody), res)
}
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, err = buildEndpointsList(res.Header["X-Docker-Endpoints"], r.indexEndpoint.VersionString(1))
if err != nil {
return nil, err
}
} else {
// Assume the endpoint is on the same host
endpoints = append(endpoints, fmt.Sprintf("%s://%s/v1/", r.indexEndpoint.URL.Scheme, req.URL.Host))
}
remoteChecksums := []*ImgData{}
if err := json.NewDecoder(res.Body).Decode(&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 *Session) PushImageChecksumRegistry(imgData *ImgData, registry string, token []string) error {
log.Debugf("[registry] Calling PUT %s", registry+"images/"+imgData.ID+"/checksum")
req, err := r.reqFactory.NewRequest("PUT", registry+"images/"+imgData.ID+"/checksum", nil)
if err != nil {
return err
}
setTokenAuth(req, token)
req.Header.Set("X-Docker-Checksum", imgData.Checksum)
req.Header.Set("X-Docker-Checksum-Payload", imgData.ChecksumPayload)
res, _, err := r.doRequest(req)
if err != nil {
return fmt.Errorf("Failed to upload metadata: %s", err)
}
defer res.Body.Close()
if len(res.Cookies()) > 0 {
r.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: %q", res.StatusCode, errBody)
}
return nil
}
// Push a local image to the registry
func (r *Session) PushImageJSONRegistry(imgData *ImgData, jsonRaw []byte, registry string, token []string) error {
log.Debugf("[registry] Calling PUT %s", registry+"images/"+imgData.ID+"/json")
req, err := r.reqFactory.NewRequest("PUT", registry+"images/"+imgData.ID+"/json", bytes.NewReader(jsonRaw))
if err != nil {
return err
}
req.Header.Add("Content-type", "application/json")
setTokenAuth(req, token)
res, _, err := r.doRequest(req)
if err != nil {
return fmt.Errorf("Failed to upload metadata: %s", err)
}
defer res.Body.Close()
if res.StatusCode == 401 && strings.HasPrefix(registry, "http://") {
return utils.NewHTTPRequestError("HTTP code 401, Docker will not send auth headers over HTTP.", res)
}
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)
}
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: %q", res.StatusCode, errBody), res)
}
return nil
}
func (r *Session) PushImageLayerRegistry(imgID string, layer io.Reader, registry string, token []string, jsonRaw []byte) (checksum string, checksumPayload string, err error) {
log.Debugf("[registry] Calling PUT %s", registry+"images/"+imgID+"/layer")
tarsumLayer, err := tarsum.NewTarSum(layer, false, tarsum.Version0)
if err != nil {
return "", "", err
}
h := sha256.New()
h.Write(jsonRaw)
h.Write([]byte{'\n'})
checksumLayer := io.TeeReader(tarsumLayer, h)
req, err := r.reqFactory.NewRequest("PUT", registry+"images/"+imgID+"/layer", checksumLayer)
if err != nil {
return "", "", err
}
req.Header.Add("Content-Type", "application/octet-stream")
req.ContentLength = -1
req.TransferEncoding = []string{"chunked"}
setTokenAuth(req, token)
res, _, err := r.doRequest(req)
if err != nil {
return "", "", fmt.Errorf("Failed to upload layer: %s", err)
}
if rc, ok := layer.(io.Closer); ok {
if err := rc.Close(); err != nil {
return "", "", 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: %q", res.StatusCode, errBody), res)
}
checksumPayload = "sha256:" + hex.EncodeToString(h.Sum(nil))
return tarsumLayer.Sum(jsonRaw), checksumPayload, nil
}
// push a tag on the registry.
// Remote has the format '<user>/<repo>
func (r *Session) PushRegistryTag(remote, revision, tag, registry string, token []string) error {
// "jsonify" the string
revision = "\"" + revision + "\""
path := fmt.Sprintf("repositories/%s/tags/%s", remote, tag)
req, err := r.reqFactory.NewRequest("PUT", registry+path, strings.NewReader(revision))
if err != nil {
return err
}
req.Header.Add("Content-type", "application/json")
setTokenAuth(req, token)
req.ContentLength = int64(len(revision))
res, _, err := r.doRequest(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 *Session) PushImageJSONIndex(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", r.indexEndpoint.VersionString(1), remote, suffix)
log.Debugf("[registry] PUT %s", u)
log.Debugf("Image list pushed to index:\n%s", imgListJSON)
headers := map[string][]string{
"Content-type": {"application/json"},
"X-Docker-Token": {"true"},
}
if validate {
headers["X-Docker-Endpoints"] = regs
}
// Redirect if necessary
var res *http.Response
for {
if res, err = r.putImageRequest(u, headers, imgListJSON); err != nil {
return nil, err
}
if !shouldRedirect(res) {
break
}
res.Body.Close()
u = res.Header.Get("Location")
log.Debugf("Redirected to %s", u)
}
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 {
log.Debugf("Error reading response body: %s", err)
}
return nil, utils.NewHTTPRequestError(fmt.Sprintf("Error: Status %d trying to push repository %s: %q", res.StatusCode, remote, errBody), res)
}
if res.Header.Get("X-Docker-Token") != "" {
tokens = res.Header["X-Docker-Token"]
log.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, err = buildEndpointsList(res.Header["X-Docker-Endpoints"], r.indexEndpoint.VersionString(1))
if err != nil {
return nil, err
}
} 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 {
log.Debugf("Error reading response body: %s", err)
}
return nil, utils.NewHTTPRequestError(fmt.Sprintf("Error: Status %d trying to push checksums %s: %q", res.StatusCode, remote, errBody), res)
}
}
return &RepositoryData{
Tokens: tokens,
Endpoints: endpoints,
}, nil
}
func (r *Session) putImageRequest(u string, headers map[string][]string, body []byte) (*http.Response, error) {
req, err := r.reqFactory.NewRequest("PUT", u, bytes.NewReader(body))
if err != nil {
return nil, err
}
req.SetBasicAuth(r.authConfig.Username, r.authConfig.Password)
req.ContentLength = int64(len(body))
for k, v := range headers {
req.Header[k] = v
}
response, _, err := r.doRequest(req)
if err != nil {
return nil, err
}
return response, nil
}
func shouldRedirect(response *http.Response) bool {
return response.StatusCode >= 300 && response.StatusCode < 400
}
func (r *Session) SearchRepositories(term string) (*SearchResults, error) {
log.Debugf("Index server: %s", r.indexEndpoint)
u := r.indexEndpoint.VersionString(1) + "search?q=" + url.QueryEscape(term)
req, err := r.reqFactory.NewRequest("GET", u, 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.doRequest(req)
if err != nil {
return nil, err
}
defer res.Body.Close()
if res.StatusCode != 200 {
return nil, utils.NewHTTPRequestError(fmt.Sprintf("Unexpected status code %d", res.StatusCode), res)
}
result := new(SearchResults)
err = json.NewDecoder(res.Body).Decode(result)
return result, err
}
func (r *Session) GetAuthConfig(withPasswd bool) *AuthConfig {
password := ""
if withPasswd {
password = r.authConfig.Password
}
return &AuthConfig{
Username: r.authConfig.Username,
Password: password,
Email: r.authConfig.Email,
}
}
func setTokenAuth(req *http.Request, token []string) {
if req.Header.Get("Authorization") == "" { // Don't override
req.Header.Set("Authorization", "Token "+strings.Join(token, ","))
}
}