private String getAccessToken() throws IOException { // firebase로 부터 access token을 가져온다. GoogleCredentials googleCredentials = GoogleCredentials .fromStream(new ClassPathResource("firebase/firebase_service_key.json").getInputStream()) .createScoped(Arrays.asList("https://www.googleapis.com/auth/cloud-platform")); googleCredentials.refreshIfExpired(); return googleCredentials.getAccessToken().get..
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