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Simplify configuration and transport

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Repository creation now just takes in an http.RoundTripper. Authenticated requests or requests which require additional headers should use the NewTransport function along with a request modifier (such an an authentication handler).

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
This commit is contained in:
Derek McGowan 2015-05-14 09:54:23 -07:00
parent 8b0ea19d39
commit 89c396e0f5
6 changed files with 95 additions and 154 deletions
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7
docs/client/layer_upload_test.go
View file

@ -124,13 +124,8 @@ func TestUploadReadFrom(t *testing.T) {
e, c := testServer(m)
defer c()
repoConfig := &RepositoryConfig{}
client, err := repoConfig.HTTPClient()
if err != nil {
t.Fatalf("Error creating client: %s", err)
}
layerUpload := &httpLayerUpload{
client: client,
client: &http.Client{},
}
// Valid case

9
docs/client/repository.go
View file

@ -20,7 +20,7 @@ import (
)
// NewRepository creates a new Repository for the given repository name and endpoint
func NewRepository(ctx context.Context, name, endpoint string, repoConfig *RepositoryConfig) (distribution.Repository, error) {
func NewRepository(ctx context.Context, name, endpoint string, transport http.RoundTripper) (distribution.Repository, error) {
if err := v2.ValidateRespositoryName(name); err != nil {
return nil, err
}
@ -30,9 +30,10 @@ func NewRepository(ctx context.Context, name, endpoint string, repoConfig *Repos
return nil, err
}
client, err := repoConfig.HTTPClient()
if err != nil {
return nil, err
client := &http.Client{
Transport: transport,
Timeout: 1 * time.Minute,
// TODO(dmcgowan): create cookie jar
}
return &repository{

18
docs/client/repository_test.go
View file

@ -97,7 +97,7 @@ func TestLayerFetch(t *testing.T) {
e, c := testServer(m)
defer c()
r, err := NewRepository(context.Background(), "test.example.com/repo1", e, &RepositoryConfig{})
r, err := NewRepository(context.Background(), "test.example.com/repo1", e, nil)
if err != nil {
t.Fatal(err)
}
@ -127,7 +127,7 @@ func TestLayerExists(t *testing.T) {
e, c := testServer(m)
defer c()
r, err := NewRepository(context.Background(), "test.example.com/repo1", e, &RepositoryConfig{})
r, err := NewRepository(context.Background(), "test.example.com/repo1", e, nil)
if err != nil {
t.Fatal(err)
}
@ -227,7 +227,7 @@ func TestLayerUploadChunked(t *testing.T) {
e, c := testServer(m)
defer c()
r, err := NewRepository(context.Background(), repo, e, &RepositoryConfig{})
r, err := NewRepository(context.Background(), repo, e, nil)
if err != nil {
t.Fatal(err)
}
@ -334,7 +334,7 @@ func TestLayerUploadMonolithic(t *testing.T) {
e, c := testServer(m)
defer c()
r, err := NewRepository(context.Background(), repo, e, &RepositoryConfig{})
r, err := NewRepository(context.Background(), repo, e, nil)
if err != nil {
t.Fatal(err)
}
@ -475,7 +475,7 @@ func TestManifestFetch(t *testing.T) {
e, c := testServer(m)
defer c()
r, err := NewRepository(context.Background(), repo, e, &RepositoryConfig{})
r, err := NewRepository(context.Background(), repo, e, nil)
if err != nil {
t.Fatal(err)
}
@ -508,7 +508,7 @@ func TestManifestFetchByTag(t *testing.T) {
e, c := testServer(m)
defer c()
r, err := NewRepository(context.Background(), repo, e, &RepositoryConfig{})
r, err := NewRepository(context.Background(), repo, e, nil)
if err != nil {
t.Fatal(err)
}
@ -553,7 +553,7 @@ func TestManifestDelete(t *testing.T) {
e, c := testServer(m)
defer c()
r, err := NewRepository(context.Background(), repo, e, &RepositoryConfig{})
r, err := NewRepository(context.Background(), repo, e, nil)
if err != nil {
t.Fatal(err)
}
@ -591,7 +591,7 @@ func TestManifestPut(t *testing.T) {
e, c := testServer(m)
defer c()
r, err := NewRepository(context.Background(), repo, e, &RepositoryConfig{})
r, err := NewRepository(context.Background(), repo, e, nil)
if err != nil {
t.Fatal(err)
}
@ -636,7 +636,7 @@ func TestManifestTags(t *testing.T) {
e, c := testServer(m)
defer c()
r, err := NewRepository(context.Background(), repo, e, &RepositoryConfig{})
r, err := NewRepository(context.Background(), repo, e, nil)
if err != nil {
t.Fatal(err)
}

121
docs/client/session.go
View file

@ -11,12 +11,6 @@ import (
"time"
)
// Authorizer is used to apply Authorization to an HTTP request
type Authorizer interface {
// Authorizer updates an HTTP request with the needed authorization
Authorize(req *http.Request) error
}
// AuthenticationHandler is an interface for authorizing a request from
// params from a "WWW-Authenicate" header for a single scheme.
type AuthenticationHandler interface {
@ -31,54 +25,11 @@ type CredentialStore interface {
Basic(*url.URL) (string, string)
}
// RepositoryConfig holds the base configuration needed to communicate
// with a registry including a method of authorization and HTTP headers.
type RepositoryConfig struct {
Header http.Header
AuthSource Authorizer
BaseTransport http.RoundTripper
}
// HTTPClient returns a new HTTP client configured for this configuration
func (rc *RepositoryConfig) HTTPClient() (*http.Client, error) {
transport := &Transport{
ExtraHeader: rc.Header,
AuthSource: rc.AuthSource,
Base: rc.BaseTransport,
}
client := &http.Client{
Transport: transport,
}
return client, nil
}
// NewTokenAuthorizer returns an authorizer which is capable of getting a token
// from a token server. The expected authorization method will be discovered
// by the authorizer, getting the token server endpoint from the URL being
// requested. Basic authentication may either be done to the token source or
// directly with the requested endpoint depending on the endpoint's
// WWW-Authenticate header.
func NewTokenAuthorizer(creds CredentialStore, transport http.RoundTripper, header http.Header, scope TokenScope) Authorizer {
return &tokenAuthorizer{
header: header,
challenges: map[string]map[string]authorizationChallenge{},
handlers: []AuthenticationHandler{
NewTokenHandler(transport, creds, scope, header),
NewBasicHandler(creds),
},
transport: transport,
}
}
// NewAuthorizer creates an authorizer which can handle multiple authentication
// schemes. The handlers are tried in order, the higher priority authentication
// methods should be first.
func NewAuthorizer(transport http.RoundTripper, header http.Header, handlers ...AuthenticationHandler) Authorizer {
func NewAuthorizer(transport http.RoundTripper, handlers ...AuthenticationHandler) RequestModifier {
return &tokenAuthorizer{
header: header,
challenges: map[string]map[string]authorizationChallenge{},
handlers: handlers,
transport: transport,
@ -86,7 +37,6 @@ func NewAuthorizer(transport http.RoundTripper, header http.Header, handlers ...
}
type tokenAuthorizer struct {
header http.Header
challenges map[string]map[string]authorizationChallenge
handlers []AuthenticationHandler
transport http.RoundTripper
@ -99,10 +49,7 @@ func (ta *tokenAuthorizer) ping(endpoint string) (map[string]authorizationChalle
}
client := &http.Client{
Transport: &Transport{
ExtraHeader: ta.header,
Base: ta.transport,
},
Transport: ta.transport,
// Ping should fail fast
Timeout: 5 * time.Second,
}
@ -140,7 +87,7 @@ HeaderLoop:
return nil, nil
}
func (ta *tokenAuthorizer) Authorize(req *http.Request) error {
func (ta *tokenAuthorizer) ModifyRequest(req *http.Request) error {
v2Root := strings.Index(req.URL.Path, "/v2/")
if v2Root == -1 {
return nil
@ -195,54 +142,52 @@ type TokenScope struct {
Actions []string
}
// NewTokenHandler creates a new AuthenicationHandler which supports
// fetching tokens from a remote token server.
func NewTokenHandler(transport http.RoundTripper, creds CredentialStore, scope TokenScope, header http.Header) AuthenticationHandler {
return &tokenHandler{
header: header,
creds: creds,
scope: scope,
}
}
func (ts TokenScope) String() string {
return fmt.Sprintf("%s:%s:%s", ts.Resource, ts.Scope, strings.Join(ts.Actions, ","))
}
func (ts *tokenHandler) client() *http.Client {
return &http.Client{
Transport: &Transport{
ExtraHeader: ts.header,
Base: ts.transport,
},
// NewTokenHandler creates a new AuthenicationHandler which supports
// fetching tokens from a remote token server.
func NewTokenHandler(transport http.RoundTripper, creds CredentialStore, scope TokenScope) AuthenticationHandler {
return &tokenHandler{
transport: transport,
creds: creds,
scope: scope,
}
}
func (ts *tokenHandler) Scheme() string {
func (th *tokenHandler) client() *http.Client {
return &http.Client{
Transport: th.transport,
Timeout: 15 * time.Second,
}
}
func (th *tokenHandler) Scheme() string {
return "bearer"
}
func (ts *tokenHandler) AuthorizeRequest(req *http.Request, params map[string]string) error {
if err := ts.refreshToken(params); err != nil {
func (th *tokenHandler) AuthorizeRequest(req *http.Request, params map[string]string) error {
if err := th.refreshToken(params); err != nil {
return err
}
req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", ts.tokenCache))
req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", th.tokenCache))
return nil
}
func (ts *tokenHandler) refreshToken(params map[string]string) error {
ts.tokenLock.Lock()
defer ts.tokenLock.Unlock()
func (th *tokenHandler) refreshToken(params map[string]string) error {
th.tokenLock.Lock()
defer th.tokenLock.Unlock()
now := time.Now()
if now.After(ts.tokenExpiration) {
token, err := ts.fetchToken(params)
if now.After(th.tokenExpiration) {
token, err := th.fetchToken(params)
if err != nil {
return err
}
ts.tokenCache = token
ts.tokenExpiration = now.Add(time.Minute)
th.tokenCache = token
th.tokenExpiration = now.Add(time.Minute)
}
return nil
@ -252,7 +197,7 @@ type tokenResponse struct {
Token string `json:"token"`
}
func (ts *tokenHandler) fetchToken(params map[string]string) (token string, err error) {
func (th *tokenHandler) fetchToken(params map[string]string) (token string, err error) {
//log.Debugf("Getting bearer token with %s for %s", challenge.Parameters, ta.auth.Username)
realm, ok := params["realm"]
if !ok {
@ -273,7 +218,7 @@ func (ts *tokenHandler) fetchToken(params map[string]string) (token string, err
reqParams := req.URL.Query()
service := params["service"]
scope := ts.scope.String()
scope := th.scope.String()
if service != "" {
reqParams.Add("service", service)
@ -283,8 +228,8 @@ func (ts *tokenHandler) fetchToken(params map[string]string) (token string, err
reqParams.Add("scope", scopeField)
}
if ts.creds != nil {
username, password := ts.creds.Basic(realmURL)
if th.creds != nil {
username, password := th.creds.Basic(realmURL)
if username != "" && password != "" {
reqParams.Add("account", username)
req.SetBasicAuth(username, password)
@ -293,7 +238,7 @@ func (ts *tokenHandler) fetchToken(params map[string]string) (token string, err
req.URL.RawQuery = reqParams.Encode()
resp, err := ts.client().Do(req)
resp, err := th.client().Do(req)
if err != nil {
return "", err
}

37
docs/client/session_test.go
View file

@ -116,14 +116,8 @@ func TestEndpointAuthorizeToken(t *testing.T) {
e, c := testServerWithAuth(m, authenicate, validCheck)
defer c()
repo1Config := &RepositoryConfig{
AuthSource: NewTokenAuthorizer(nil, nil, nil, tokenScope1),
}
client, err := repo1Config.HTTPClient()
if err != nil {
t.Fatalf("Error creating http client: %s", err)
}
transport1 := NewTransport(nil, NewAuthorizer(nil, NewTokenHandler(nil, nil, tokenScope1)))
client := &http.Client{Transport: transport1}
req, _ := http.NewRequest("GET", e+"/v2/hello", nil)
resp, err := client.Do(req)
@ -141,13 +135,8 @@ func TestEndpointAuthorizeToken(t *testing.T) {
e2, c2 := testServerWithAuth(m, authenicate, badCheck)
defer c2()
repo2Config := &RepositoryConfig{
AuthSource: NewTokenAuthorizer(nil, nil, nil, tokenScope2),
}
client2, err := repo2Config.HTTPClient()
if err != nil {
t.Fatalf("Error creating http client: %s", err)
}
transport2 := NewTransport(nil, NewAuthorizer(nil, NewTokenHandler(nil, nil, tokenScope2)))
client2 := &http.Client{Transport: transport2}
req, _ = http.NewRequest("GET", e2+"/v2/hello", nil)
resp, err = client2.Do(req)
@ -220,14 +209,9 @@ func TestEndpointAuthorizeTokenBasic(t *testing.T) {
username: username,
password: password,
}
repoConfig := &RepositoryConfig{
AuthSource: NewTokenAuthorizer(creds, nil, nil, tokenScope),
}
client, err := repoConfig.HTTPClient()
if err != nil {
t.Fatalf("Error creating http client: %s", err)
}
transport1 := NewTransport(nil, NewAuthorizer(nil, NewTokenHandler(nil, creds, tokenScope), NewBasicHandler(creds)))
client := &http.Client{Transport: transport1}
req, _ := http.NewRequest("GET", e+"/v2/hello", nil)
resp, err := client.Do(req)
@ -265,14 +249,9 @@ func TestEndpointAuthorizeBasic(t *testing.T) {
username: username,
password: password,
}
repoConfig := &RepositoryConfig{
AuthSource: NewTokenAuthorizer(creds, nil, nil, TokenScope{}),
}
client, err := repoConfig.HTTPClient()
if err != nil {
t.Fatalf("Error creating http client: %s", err)
}
transport1 := NewTransport(nil, NewAuthorizer(nil, NewBasicHandler(creds)))
client := &http.Client{Transport: transport1}
req, _ := http.NewRequest("GET", e+"/v2/hello", nil)
resp, err := client.Do(req)

57
docs/client/transport.go
View file

@ -6,14 +6,36 @@ import (
"sync"
)
// Transport is an http.RoundTripper that makes registry HTTP requests,
// wrapping a base RoundTripper and adding an Authorization header
// from an Auth source
type Transport struct {
AuthSource Authorizer
ExtraHeader http.Header
type RequestModifier interface {
ModifyRequest(*http.Request) error
}
Base http.RoundTripper
type headerModifier http.Header
func NewHeaderRequestModifier(header http.Header) RequestModifier {
return headerModifier(header)
}
func (h headerModifier) ModifyRequest(req *http.Request) error {
for k, s := range http.Header(h) {
req.Header[k] = append(req.Header[k], s...)
}
return nil
}
func NewTransport(base http.RoundTripper, modifiers ...RequestModifier) http.RoundTripper {
return &transport{
Modifiers: modifiers,
Base: base,
}
}
// transport is an http.RoundTripper that makes HTTP requests after
// copying and modifying the request
type transport struct {
Modifiers []RequestModifier
Base http.RoundTripper
mu sync.Mutex // guards modReq
modReq map[*http.Request]*http.Request // original -> modified
@ -22,13 +44,14 @@ type Transport struct {
// RoundTrip authorizes and authenticates the request with an
// access token. If no token exists or token is expired,
// tries to refresh/fetch a new token.
func (t *Transport) RoundTrip(req *http.Request) (*http.Response, error) {
req2 := t.cloneRequest(req)
if t.AuthSource != nil {
if err := t.AuthSource.Authorize(req2); err != nil {
func (t *transport) RoundTrip(req *http.Request) (*http.Response, error) {
req2 := cloneRequest(req)
for _, modifier := range t.Modifiers {
if err := modifier.ModifyRequest(req2); err != nil {
return nil, err
}
}
t.setModReq(req, req2)
res, err := t.base().RoundTrip(req2)
if err != nil {
@ -43,7 +66,7 @@ func (t *Transport) RoundTrip(req *http.Request) (*http.Response, error) {
}
// CancelRequest cancels an in-flight request by closing its connection.
func (t *Transport) CancelRequest(req *http.Request) {
func (t *transport) CancelRequest(req *http.Request) {
type canceler interface {
CancelRequest(*http.Request)
}
@ -56,14 +79,14 @@ func (t *Transport) CancelRequest(req *http.Request) {
}
}
func (t *Transport) base() http.RoundTripper {
func (t *transport) base() http.RoundTripper {
if t.Base != nil {
return t.Base
}
return http.DefaultTransport
}
func (t *Transport) setModReq(orig, mod *http.Request) {
func (t *transport) setModReq(orig, mod *http.Request) {
t.mu.Lock()
defer t.mu.Unlock()
if t.modReq == nil {
@ -78,7 +101,7 @@ func (t *Transport) setModReq(orig, mod *http.Request) {
// cloneRequest returns a clone of the provided *http.Request.
// The clone is a shallow copy of the struct and its Header map.
func (t *Transport) cloneRequest(r *http.Request) *http.Request {
func cloneRequest(r *http.Request) *http.Request {
// shallow copy of the struct
r2 := new(http.Request)
*r2 = *r
@ -87,9 +110,7 @@ func (t *Transport) cloneRequest(r *http.Request) *http.Request {
for k, s := range r.Header {
r2.Header[k] = append([]string(nil), s...)
}
for k, s := range t.ExtraHeader {
r2.Header[k] = append(r2.Header[k], s...)
}
return r2
}