fix(generic-oauth): await async mapProfileToUser (#5479)

Co-authored-by: Bereket Engida <86073083+Bekacru@users.noreply.github.com>

packages/better-auth/src/plugins/generic-oauth/generic-oauth.test.ts

@@ -961,4 +961,42 @@ describe("oauth2", async () => {
 		expect(session.data?.user.email).toBe("oauth2-cookie-state@test.com");
 		expect(session.data?.user.name).toBe("OAuth2 Cookie State");
 	});
+
+	it("should await async mapProfileToUser", async () => {
+		const { auth } = await getTestInstance({
+			plugins: [
+				genericOAuth({
+					config: [
+						{
+							providerId: "test-async",
+							clientId: clientId,
+							clientSecret: clientSecret,
+							getUserInfo: async (_tokens) => ({
+								id: "test-user-id",
+								email: "test@example.com",
+								name: "Test User",
+								emailVerified: true,
+							}),
+							mapProfileToUser: async (
+								_profile,
+							): Promise<Record<string, any>> => {
+								return { customField: "async-custom-data" };
+							},
+						},
+					],
+				}),
+			],
+		});
+
+		const context = await auth.$context;
+		const provider = context.socialProviders.find((p) => p.id === "test-async");
+
+		const result = await provider!.getUserInfo({
+			accessToken: "test-access-token",
+			idToken: undefined,
+			refreshToken: undefined,
+		});
+
+		expect(result?.user).toHaveProperty("customField", "async-custom-data");
+	});
 });

packages/better-auth/src/plugins/generic-oauth/index.ts

@@ -321,6 +321,9 @@ export const genericOAuth = (options: GenericOAuthOptions) => {
 						if (!userInfo) {
 							return null;
 						}
+
+						const userMap = await c.mapProfileToUser?.(userInfo);
+
 						return {
 							user: {
 								id: userInfo?.id,
@@ -328,7 +331,7 @@ export const genericOAuth = (options: GenericOAuthOptions) => {
 								emailVerified: userInfo?.emailVerified,
 								image: userInfo?.image,
 								name: userInfo?.name,
-								...c.mapProfileToUser?.(userInfo),
+								...userMap,
 							},
 							data: userInfo,
 						};