fix: storeStateStrategy default to database if provided (#6619)

Author: himself65

packages/better-auth/src/context/create-context.ts

@@ -170,7 +170,9 @@ export async function createAuthContext(
 		socialProviders: providers,
 		options,
 		oauthConfig: {
-			storeStateStrategy: options.account?.storeStateStrategy || "database",
+			storeStateStrategy:
+				options.account?.storeStateStrategy ||
+				(options.database ? "database" : "cookie"),
 			skipStateCookieCheck: !!options.account?.skipStateCookieCheck,
 		},
 		tables,

packages/better-auth/src/oauth2/state.ts

@@ -27,8 +27,7 @@ export async function generateState(
 
 	const codeVerifier = generateRandomString(128);
 	const state = generateRandomString(32);
-	const storeStateStrategy =
-		c.context.oauthConfig?.storeStateStrategy || "cookie";
+	const storeStateStrategy = c.context.oauthConfig.storeStateStrategy;
 
 	const stateData = {
 		...(additionalData ? additionalData : {}),
@@ -99,8 +98,7 @@ export async function generateState(
 
 export async function parseState(c: GenericEndpointContext) {
 	const state = c.query.state || c.body.state;
-	const storeStateStrategy =
-		c.context.oauthConfig.storeStateStrategy || "cookie";
+	const storeStateStrategy = c.context.oauthConfig.storeStateStrategy;
 
 	const stateDataSchema = z.looseObject({
 		callbackURL: z.string(),