feat: custom session response (#579)

demo/nextjs/lib/auth/plugins/custom-session.ts

@@ -0,0 +1,32 @@
+import { BetterAuthPlugin } from "better-auth";
+import { createAuthEndpoint } from "better-auth/plugins";
+import { getSessionFromCtx } from "better-auth/api";
+
+export const customSession = () => {
+	return {
+		id: "custom-session",
+		endpoints: {
+			getSession: createAuthEndpoint(
+				"/get-session",
+				{
+					method: "GET",
+				},
+				async (ctx) => {
+					const session = await getSessionFromCtx(ctx);
+					if (!session) {
+						return ctx.json(null);
+					}
+					const roles: {
+						id: number;
+						name: string;
+					}[] = [];
+					return ctx.json({
+						user: session.user,
+						session: session.session,
+						roles,
+					});
+				},
+			),
+		},
+	} satisfies BetterAuthPlugin;
+};