Refactor web package and context package (#25298)

1. The "web" package shouldn't depends on "modules/context" package,
instead, let each "web context" register themselves to the "web"
package.
2. The old Init/Free doesn't make sense, so simplify it
* The ctx in "Init(ctx)" is never used, and shouldn't be used that way
* The "Free" is never called and shouldn't be called because the SSPI
instance is shared

---------

Co-authored-by: Giteabot <teabot@gitea.io>

services/auth/group.go

@@ -4,7 +4,6 @@
 package auth
 
 import (
-	"context"
 	"net/http"
 	"reflect"
 	"strings"
@@ -14,9 +13,7 @@ import (
 
 // Ensure the struct implements the interface.
 var (
-	_ Method        = &Group{}
-	_ Initializable = &Group{}
-	_ Freeable      = &Group{}
+	_ Method = &Group{}
 )
 
 // Group implements the Auth interface with serval Auth.
@@ -49,35 +46,6 @@ func (b *Group) Name() string {
 	return strings.Join(names, ",")
 }
 
-// Init does nothing as the Basic implementation does not need to allocate any resources
-func (b *Group) Init(ctx context.Context) error {
-	for _, method := range b.methods {
-		initializable, ok := method.(Initializable)
-		if !ok {
-			continue
-		}
-
-		if err := initializable.Init(ctx); err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
-// Free does nothing as the Basic implementation does not have to release any resources
-func (b *Group) Free() error {
-	for _, method := range b.methods {
-		freeable, ok := method.(Freeable)
-		if !ok {
-			continue
-		}
-		if err := freeable.Free(); err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
 // Verify extracts and validates
 func (b *Group) Verify(req *http.Request, w http.ResponseWriter, store DataStore, sess SessionStore) (*user_model.User, error) {
 	// Try to sign in with each of the enabled plugins

services/auth/interface.go

@@ -29,26 +29,11 @@ type Method interface {
 	Verify(http *http.Request, w http.ResponseWriter, store DataStore, sess SessionStore) (*user_model.User, error)
 }
 
-// Initializable represents a structure that requires initialization
-// It usually should only be called once before anything else is called
-type Initializable interface {
-	// Init should be called exactly once before using any of the other methods,
-	// in order to allow the plugin to allocate necessary resources
-	Init(ctx context.Context) error
-}
-
 // Named represents a named thing
 type Named interface {
 	Name() string
 }
 
-// Freeable represents a structure that is required to be freed
-type Freeable interface {
-	// Free should be called exactly once before application closes, in order to
-	// give chance to the plugin to free any allocated resources
-	Free() error
-}
-
 // PasswordAuthenticator represents a source of authentication
 type PasswordAuthenticator interface {
 	Authenticate(user *user_model.User, login, password string) (*user_model.User, error)

services/auth/sspi_windows.go

@@ -4,10 +4,10 @@
 package auth
 
 import (
-	"context"
 	"errors"
 	"net/http"
 	"strings"
+	"sync"
 
 	"code.gitea.io/gitea/models/auth"
 	"code.gitea.io/gitea/models/avatars"
@@ -32,13 +32,12 @@ var (
 	// sspiAuth is a global instance of the websspi authentication package,
 	// which is used to avoid acquiring the server credential handle on
 	// every request
-	sspiAuth *websspi.Authenticator
+	sspiAuth     *websspi.Authenticator
+	sspiAuthOnce sync.Once
 
 	// Ensure the struct implements the interface.
-	_ Method        = &SSPI{}
-	_ Named         = &SSPI{}
-	_ Initializable = &SSPI{}
-	_ Freeable      = &SSPI{}
+	_ Method = &SSPI{}
+	_ Named  = &SSPI{}
 )
 
 // SSPI implements the SingleSignOn interface and authenticates requests
@@ -47,32 +46,25 @@ var (
 // Returns nil if authentication fails.
 type SSPI struct{}
 
-// Init creates a new global websspi.Authenticator object
-func (s *SSPI) Init(ctx context.Context) error {
-	config := websspi.NewConfig()
-	var err error
-	sspiAuth, err = websspi.New(config)
-	if err != nil {
-		return err
-	}
-	return nil
-}
-
 // Name represents the name of auth method
 func (s *SSPI) Name() string {
 	return "sspi"
 }
 
-// Free releases resources used by the global websspi.Authenticator object
-func (s *SSPI) Free() error {
-	return sspiAuth.Free()
-}
-
 // Verify uses SSPI (Windows implementation of SPNEGO) to authenticate the request.
 // If authentication is successful, returns the corresponding user object.
 // If negotiation should continue or authentication fails, immediately returns a 401 HTTP
 // response code, as required by the SPNEGO protocol.
 func (s *SSPI) Verify(req *http.Request, w http.ResponseWriter, store DataStore, sess SessionStore) (*user_model.User, error) {
+	var errInit error
+	sspiAuthOnce.Do(func() {
+		config := websspi.NewConfig()
+		sspiAuth, errInit = websspi.New(config)
+	})
+	if errInit != nil {
+		return nil, errInit
+	}
+
 	if !s.shouldAuthenticate(req) {
 		return nil, nil
 	}