refactor(db): use new store interface (#831)

internal/repository/memory/store.go

@@ -0,0 +1,27 @@
+// Package memory provides an in-memory implementation of repository.Store for use in tests.
+package memory
+
+import (
+	"sync"
+
+	"github.com/tinyauthapp/tinyauth/internal/repository"
+)
+
+// Store is a thread-safe in-memory implementation of repository.Store.
+type Store struct {
+	mu         sync.RWMutex
+	sessions   map[string]repository.Session
+	oidcCodes  map[string]repository.OidcCode
+	oidcTokens map[string]repository.OidcToken
+	oidcUsers  map[string]repository.OidcUserinfo
+}
+
+// New returns a new empty in-memory Store.
+func New() repository.Store {
+	return &Store{
+		sessions:   make(map[string]repository.Session),
+		oidcCodes:  make(map[string]repository.OidcCode),
+		oidcTokens: make(map[string]repository.OidcToken),
+		oidcUsers:  make(map[string]repository.OidcUserinfo),
+	}
+}