add initial auth0 module

auth/auth0/auth0.go

@@ -0,0 +1,89 @@
+package auth0
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"net/url"
+
+	"github.com/go-chi/chi/v5"
+
+	"dstar/auth0/authenticator"
+)
+
+type Logger interface {
+	Debug(msg string, args ...any)
+	Info(msg string, args ...any)
+	Error(msg string, args ...any)
+}
+
+type SessionManager interface {
+	Get(ctx context.Context, key string) any
+	Put(ctx context.Context, key string, value any) error
+}
+
+type Config struct {
+	Logger   Logger
+	Sessions SessionManager
+}
+
+type Option func(deps *Config)
+
+func WithLogger(l Logger) Option {
+	return func(cfg *Config) {
+		cfg.Logger = l
+	}
+}
+
+func WithSessions(s SessionManager) Option {
+	return func(cfg *Config) {
+		cfg.Sessions = s
+	}
+}
+
+type deps struct {
+	auth       *authenticator.Authenticator
+	logoutBase *url.URL
+	log        Logger
+	sessions   SessionManager
+}
+
+func New(opts ...Option) (func(chi.Router), Middleware, error) {
+	cfg := Config{}
+
+	for _, opt := range opts {
+		opt(&cfg)
+	}
+
+	if cfg.Logger == nil {
+		return nil, nil, ErrNilLogger
+	}
+	if cfg.Sessions == nil {
+		return nil, nil, ErrNilSessions
+	}
+
+	auth, err := authenticator.New()
+	if err != nil {
+		return nil, nil, err
+	}
+
+	logoutURL, err := url.Parse(auth.LogoutURL)
+	if err != nil {
+		return nil, nil, fmt.Errorf("unable to parse logout URL: %w", err)
+	}
+
+	d := &deps{
+		log:        cfg.Logger,
+		logoutBase: logoutURL,
+		sessions:   cfg.Sessions,
+		auth:       auth,
+	}
+
+	mw := func(next http.Handler) http.Handler {
+		return authenticatedMiddleware(d, next)
+	}
+
+	return func(r chi.Router) {
+		Register(r, d)
+	}, mw, nil
+}