Begin developing bot, event, and integration pipeline

backend/src/integrations/refresh.ts

@@ -0,0 +1,78 @@
+import axios from 'axios';
+import * as Sentry from '@sentry/node';
+import { INTEGRATION_HEROKU } from '../variables';
+import {
+    OAUTH_CLIENT_SECRET_HEROKU
+} from '../config';
+import {
+    OAUTH_TOKEN_URL_HEROKU
+} from '../variables';
+
+/**
+ * Return new access token by exchanging refresh token [refreshToken] for integration
+ * named [integration]
+ * @param {Object} obj
+ * @param {String} obj.integration - name of integration
+ * @param {String} obj.refreshToken - refresh token to use to get new access token for Heroku 
+ */
+const exchangeRefresh = async ({
+    integration,
+    refreshToken
+}: {
+    integration: string;
+    refreshToken: string;
+}) => {
+    let accessToken;
+    try {
+        switch (integration) {
+            case INTEGRATION_HEROKU:
+                accessToken = await exchangeRefreshHeroku({
+                    refreshToken
+                });
+                break;
+        }
+    } catch (err) {
+        Sentry.setUser(null);
+        Sentry.captureException(err);
+        throw new Error('Failed to get new OAuth2 access token'); 
+    }
+    
+    return accessToken;
+}
+
+/**
+ * Return new access token by exchanging refresh token [refreshToken] for the
+ * Heroku integration
+ * @param {Object} obj
+ * @param {String} obj.refreshToken - refresh token to use to get new access token for Heroku
+ * @returns 
+ */
+const exchangeRefreshHeroku = async ({
+    refreshToken
+}: {
+    refreshToken: string;
+}) => {
+    let accessToken;
+    try {
+        const res = await axios.post(
+            OAUTH_TOKEN_URL_HEROKU,
+            new URLSearchParams({
+                grant_type: 'refresh_token',
+                refresh_token: refreshToken,
+                client_secret: OAUTH_CLIENT_SECRET_HEROKU
+            } as any)
+        );
+
+        accessToken = res.data.access_token;
+    } catch (err) {
+        Sentry.setUser(null);
+        Sentry.captureException(err);
+        throw new Error('Failed to get new OAuth2 access token for Heroku');
+    }
+    
+    return accessToken;
+}
+
+export {
+    exchangeRefresh
+}