feat(mailchimp): add mailchimp integration

packages/backend/src/apps/mailchimp/auth/verify-credentials.js

@@ -0,0 +1,40 @@
+import getCurrentUser from '../common/get-current-user.js';
+
+const verifyCredentials = async ($) => {
+  const oauthRedirectUrlField = $.app.auth.fields.find(
+    (field) => field.key == 'oAuthRedirectUrl'
+  );
+  const redirectUri = oauthRedirectUrlField.value;
+  const params = new URLSearchParams({
+    grant_type: 'authorization_code',
+    client_id: $.auth.data.clientId,
+    client_secret: $.auth.data.clientSecret,
+    redirect_uri: redirectUri,
+    code: $.auth.data.code,
+  });
+
+  const { data } = await $.http.post(
+    'https://login.mailchimp.com/oauth2/token',
+    params.toString()
+  );
+
+  await $.auth.set({
+    accessToken: data.access_token,
+    tokenType: data.token_type,
+  });
+
+  const currentUser = await getCurrentUser($);
+
+  await $.auth.set({
+    clientId: $.auth.data.clientId,
+    clientSecret: $.auth.data.clientSecret,
+    scope: $.auth.data.scope,
+    idToken: data.id_token,
+    expiresIn: data.expires_in,
+    refreshToken: data.refresh_token,
+    serverPrefix: currentUser.dc,
+    screenName: currentUser.login.login_name,
+  });
+};
+
+export default verifyCredentials;