Initial QSfera import

Server/services/proxy/pkg/user/backend/backend.go

@@ -0,0 +1,26 @@
+package backend
+
+import (
+	"context"
+	"errors"
+
+	cs3 "github.com/cs3org/go-cs3apis/cs3/identity/user/v1beta1"
+)
+
+var (
+	// ErrAccountNotFound account not found
+	ErrAccountNotFound = errors.New("user not found")
+	// ErrAccountDisabled account disabled
+	ErrAccountDisabled = errors.New("account disabled")
+	// ErrNotSupported operation not supported by user-backend
+	ErrNotSupported = errors.New("operation not supported")
+)
+
+// UserBackend allows the proxy to retrieve users from different user-backends (accounts-service, CS3)
+type UserBackend interface {
+	GetUserByClaims(ctx context.Context, claim, value string) (*cs3.User, string, error)
+	Authenticate(ctx context.Context, username string, password string) (*cs3.User, string, error)
+	CreateUserFromClaims(ctx context.Context, claims map[string]any) (*cs3.User, error)
+	UpdateUserIfNeeded(ctx context.Context, user *cs3.User, claims map[string]any) error
+	SyncGroupMemberships(ctx context.Context, user *cs3.User, claims map[string]any) error
+}