Simplify configuration and transport

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)

registry/client/layer_upload_test.go

@@ -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

registry/client/repository.go

@@ -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{

registry/client/repository_test.go

@@ -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)
 	}

registry/client/session.go

@@ -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
 }
 
+func (ts TokenScope) String() string {
+	return fmt.Sprintf("%s:%s:%s", ts.Resource, ts.Scope, strings.Join(ts.Actions, ","))
+}
+
 // 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 {
+func NewTokenHandler(transport http.RoundTripper, creds CredentialStore, scope TokenScope) AuthenticationHandler {
 	return &tokenHandler{
-		header: header,
+		transport: transport,
 		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 {
+func (th *tokenHandler) client() *http.Client {
 	return &http.Client{
-		Transport: &Transport{
-			ExtraHeader: ts.header,
-			Base:        ts.transport,
-		},
+		Transport: th.transport,
+		Timeout:   15 * time.Second,
 	}
 }
 
-func (ts *tokenHandler) Scheme() string {
+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
 	}

registry/client/session_test.go

@@ -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)

registry/client/transport.go

@@ -6,13 +6,35 @@ 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
+}
 
+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
@@ -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
 }