/
tokentransport.go
157 lines (131 loc) · 3.44 KB
/
tokentransport.go
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package registry
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"net/url"
)
const dockerApiLogin = "https://hub.docker.com/v2/users/login/"
type TokenTransport struct {
Transport http.RoundTripper
Username string
Password string
}
func (t *TokenTransport) RoundTrip(req *http.Request) (*http.Response, error) {
resp, err := t.Transport.RoundTrip(req)
if err != nil {
return resp, err
}
if authService := isTokenDemand(resp); authService != nil {
_, err := ioutil.ReadAll(resp.Body)
if err == nil {
err = resp.Body.Close()
}
if err != nil {
return nil, fmt.Errorf("http: failed to close token demand response (status=%v, err=%q)", resp.StatusCode, err)
}
resp, err = t.authAndRetry(authService, req)
}
return resp, err
}
type authToken struct {
Token string `json:"token"`
}
func (t *TokenTransport) authAndRetry(authService *authService, req *http.Request) (*http.Response, error) {
token, authResp, err := t.auth(authService)
if err != nil {
return authResp, err
}
retryResp, err := t.retry(req, token)
return retryResp, err
}
func (t *TokenTransport) auth(authService *authService) (string, *http.Response, error) {
authReq, err := authService.Request(t.Username, t.Password)
if err != nil {
return "", nil, err
}
client := http.Client{
Transport: t.Transport,
}
response, err := client.Do(authReq)
if err != nil {
return "", nil, err
}
if response.StatusCode != http.StatusOK {
return "", response, err
}
defer response.Body.Close()
var authToken authToken
decoder := json.NewDecoder(response.Body)
err = decoder.Decode(&authToken)
if err != nil {
return "", nil, err
}
return authToken.Token, nil, nil
}
func (t *TokenTransport) retry(req *http.Request, token string) (*http.Response, error) {
req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token))
resp, err := t.Transport.RoundTrip(req)
return resp, err
}
type authService struct {
Realm string
Service string
Scope string
dockerApi bool
}
func (authService *authService) Request(username, password string) (*http.Request, error) {
url, err := url.Parse(authService.Realm)
if err != nil {
return nil, err
}
q := url.Query()
if authService.Service != "" {
q.Set("service", authService.Service)
}
if authService.Scope != "" {
q.Set("scope", authService.Scope)
}
url.RawQuery = q.Encode()
var data []byte
if authService.dockerApi {
data = []byte(fmt.Sprintf("{\"username\": \"%s\", \"password\": \"%s\"}", username, password))
}
request, err := http.NewRequest("GET", url.String(), bytes.NewReader(data))
if authService.dockerApi {
request.Header.Set("Content-Type", "application/json")
}
if username != "" || password != "" {
request.SetBasicAuth(username, password)
}
return request, err
}
func isTokenDemand(resp *http.Response) *authService {
if resp == nil {
return nil
}
if resp.StatusCode != http.StatusUnauthorized {
return nil
}
return parseOauthHeader(resp)
}
func parseOauthHeader(resp *http.Response) *authService {
challenges := parseAuthHeader(resp.Header)
for _, challenge := range challenges {
if challenge.Scheme == "bearer" {
return &authService{
Realm: challenge.Parameters["realm"],
Service: challenge.Parameters["service"],
Scope: challenge.Parameters["scope"],
}
} else if challenge.Scheme == "jwt" && challenge.Parameters["realm"] == "api" {
return &authService{
Realm: dockerApiLogin,
dockerApi: true,
}
}
}
return nil
}