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diff --git a/keyserver/src/push/providers.js b/keyserver/src/push/providers.js
--- a/keyserver/src/push/providers.js
+++ b/keyserver/src/push/providers.js
@@ -5,6 +5,7 @@
import fcmAdmin from 'firebase-admin';
import type { FirebaseApp } from 'firebase-admin';
import invariant from 'invariant';
+import fetch from 'node-fetch';
import webpush from 'web-push';
import type { PlatformDetails } from 'lib/types/device-types';
@@ -122,6 +123,57 @@
await getWebPushConfig();
}
+type WNSConfig = { +tenantID: string, +appID: string, +secret: string };
+type WNSAccessToken = { +token: string, +expires: number };
+let wnsAccessToken: ?WNSAccessToken = null;
+async function getWNSToken(): Promise<?string> {
+ const expiryWindowInMs = 10_000;
+ if (
+ wnsAccessToken &&
+ wnsAccessToken.expires >= Date.now() - expiryWindowInMs
+ ) {
+ return wnsAccessToken.token;
+ }
+
+ const config = await importJSON<WNSConfig>({
+ folder: 'secrets',
+ name: 'wns_config',
+ });
+
+ if (!config) {
+ return null;
+ }
+
+ const params = new URLSearchParams();
+ params.append('grant_type', 'client_credentials');
+ params.append('client_id', config.appID);
+ params.append('client_secret', config.secret);
+ params.append('scope', 'https://wns.windows.com/.default');
+
+ try {
+ const response = await fetch(
+ `https://login.microsoftonline.com/${config.tenantID}/oauth2/v2.0/token`,
+ { method: 'POST', body: params },
+ );
+
+ if (!response.ok) {
+ console.error('Failure when getting the WNS token: ', response);
+ return null;
+ }
+
+ const responseJson = await response.json();
+ wnsAccessToken = {
+ token: responseJson['access_token'],
+ expires: Date.now() + responseJson['expires_in'] * 1000,
+ };
+ } catch (err) {
+ console.error('Failure when getting the WNS token: ', err);
+ return null;
+ }
+
+ return wnsAccessToken?.token;
+}
+
export {
getAPNPushProfileForCodeVersion,
getFCMPushProfileForCodeVersion,
@@ -132,4 +184,5 @@
getAPNsNotificationTopic,
getWebPushConfig,
ensureWebPushInitialized,
+ getWNSToken,
};

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