Checkpoint: auth, engine, seal, server, grpc updates

Co-authored-by: Junie <junie@jetbrains.com>

internal/auth/auth.go

@@ -5,6 +5,7 @@ import (
 	"crypto/sha256"
 	"encoding/hex"
 	"errors"
+	"log/slog"
 	"sync"
 	"time"
 
@@ -34,29 +35,35 @@ type cachedClaims struct {
 // Authenticator provides MCIAS-backed authentication.
 type Authenticator struct {
 	client *mcias.Client
+	logger *slog.Logger
 
 	mu    sync.RWMutex
 	cache map[string]*cachedClaims // keyed by SHA-256(token)
 }
 
 // NewAuthenticator creates a new authenticator with the given MCIAS client.
-func NewAuthenticator(client *mcias.Client) *Authenticator {
+func NewAuthenticator(client *mcias.Client, logger *slog.Logger) *Authenticator {
 	return &Authenticator{
 		client: client,
+		logger: logger,
 		cache:  make(map[string]*cachedClaims),
 	}
 }
 
 // Login authenticates a user via MCIAS and returns the token.
 func (a *Authenticator) Login(username, password, totpCode string) (token string, expiresAt string, err error) {
+	a.logger.Debug("login attempt", "username", username)
 	tok, exp, err := a.client.Login(username, password, totpCode)
 	if err != nil {
 		var authErr *mcias.MciasAuthError
 		if errors.As(err, &authErr) {
+			a.logger.Debug("login failed: invalid credentials", "username", username)
 			return "", "", ErrInvalidCredentials
 		}
+		a.logger.Debug("login failed", "username", username, "error", err)
 		return "", "", err
 	}
+	a.logger.Debug("login succeeded", "username", username)
 	return tok, exp, nil
 }
 
@@ -69,15 +76,19 @@ func (a *Authenticator) ValidateToken(token string) (*TokenInfo, error) {
 	cached, ok := a.cache[key]
 	a.mu.RUnlock()
 	if ok && time.Now().Before(cached.expiresAt) {
+		a.logger.Debug("token validated from cache")
 		return cached.info, nil
 	}
 
+	a.logger.Debug("validating token with MCIAS")
 	// Validate with MCIAS.
 	claims, err := a.client.ValidateToken(token)
 	if err != nil {
+		a.logger.Debug("token validation failed", "error", err)
 		return nil, err
 	}
 	if !claims.Valid {
+		a.logger.Debug("token invalid per MCIAS")
 		return nil, ErrInvalidToken
 	}
 
@@ -94,6 +105,7 @@ func (a *Authenticator) ValidateToken(token string) (*TokenInfo, error) {
 		expiresAt: time.Now().Add(tokenCacheTTL),
 	}
 	a.mu.Unlock()
+	a.logger.Debug("token validated and cached", "username", info.Username, "is_admin", info.IsAdmin)
 
 	return info, nil
 }
@@ -105,6 +117,7 @@ func (a *Authenticator) Logout(client *mcias.Client) error {
 
 // ClearCache removes all cached token validations.
 func (a *Authenticator) ClearCache() {
+	a.logger.Debug("clearing token cache")
 	a.mu.Lock()
 	a.cache = make(map[string]*cachedClaims)
 	a.mu.Unlock()