feat(xero): add xero integration

packages/backend/src/apps/xero/auth/verify-credentials.ts

@@ -0,0 +1,53 @@
+import { IField, IGlobalVariable } from '@automatisch/types';
+import getCurrentUser from '../common/get-current-user';
+import { URLSearchParams } from 'url';
+
+const verifyCredentials = async ($: IGlobalVariable) => {
+  const oauthRedirectUrlField = $.app.auth.fields.find(
+    (field: IField) => field.key == 'oAuthRedirectUrl'
+  );
+  const redirectUri = oauthRedirectUrlField.value as string;
+  const headers = {
+    Authorization: `Basic ${Buffer.from(
+      $.auth.data.clientId + ':' + $.auth.data.clientSecret
+    ).toString('base64')}`,
+    'Content-Type': 'application/x-www-form-urlencoded',
+  };
+  const params = new URLSearchParams({
+    grant_type: 'authorization_code',
+    code: $.auth.data.code as string,
+    redirect_uri: redirectUri,
+  });
+
+  const { data } = await $.http.post(
+    'https://identity.xero.com/connect/token',
+    params.toString(),
+    {
+      headers,
+    }
+  );
+
+  await $.auth.set({
+    accessToken: data.access_token,
+    tokenType: data.token_type,
+    idToken: data.id_token,
+  });
+
+  const currentUser = await getCurrentUser($);
+
+  const screenName = [currentUser.tenantName, currentUser.tenantType]
+    .filter(Boolean)
+    .join(' @ ');
+
+  await $.auth.set({
+    clientId: $.auth.data.clientId,
+    clientSecret: $.auth.data.clientSecret,
+    scope: $.auth.data.scope,
+    expiresIn: data.expires_in,
+    refreshToken: data.refresh_token,
+    tenantId: currentUser.tenantId,
+    screenName,
+  });
+};
+
+export default verifyCredentials;