2 files changed, 49 insertions, 1 deletions
diff --git a/pkg/api/api0/api.go b/pkg/api/api0/api.go
index 984c9a2..8273435 100644
--- a/pkg/api/api0/api.go
+++ b/pkg/api/api0/api.go
@@ -21,6 +21,9 @@ import (
 
 // Handler serves requests for the original master server API.
 type Handler struct {
+	// AccountStorage stores accounts. It must be non-nil.
+	AccountStorage AccountStorage
+
 	// PdataStorage stores player data. It must be non-nil.
 	PdataStorage PdataStorage
 
diff --git a/pkg/api/api0/storage.go b/pkg/api/api0/storage.go
index a17e8da..fdf411b 100644
--- a/pkg/api/api0/storage.go
+++ b/pkg/api/api0/storage.go
@@ -1,6 +1,51 @@
 package api0
 
-import "crypto/sha256"
+import (
+	"crypto/sha256"
+	"net/netip"
+	"time"
+)
+
+// Account contains information about a registered account.
+type Account struct {
+	// UID is the player's Origin UID.
+	UID uint64 // required, unique
+
+	// Username is the player's last known in-game username (their EAID).
+	Username string // optional (but will usually be there)
+
+	// AuthIP is the IP used for the current auth session.
+	AuthIP netip.Addr
+
+	// AuthToken is the random token generated for the current auth session.
+	AuthToken string
+
+	// AuthTokenExpiry is the expiry date of the current auth token.
+	AuthTokenExpiry time.Time
+
+	// LastServerID is the ID of the last server the account connected to.
+	LastServerID string
+}
+
+func (a Account) IsOnOwnServer() bool {
+	return a.LastServerID == "self"
+}
+
+// AccountStorage stores information about registered users. It must be safe
+// for concurrent use.
+type AccountStorage interface {
+	// GetUIDsByUsername gets all known UIDs matching username. If none match, a
+	// nil/zero-length slice is returned. If another error occurs, err is
+	// non-nil.
+	GetUIDsByUsername(username string) ([]uint64, error)
+
+	// GetAccount gets the player matching uid. If none exists, nil is returned.
+	// If another error occurs, err is non-nil.
+	GetAccount(uid uint64) (*Account, error)
+
+	// SaveAccount creates or replaces an account by its uid.
+	SaveAccount(a *Account) error
+}
 
 // PdataStorage stores player data for users. It should not make any assumptions
 // on the contents of the stored blobs (including validity). It may compress the