refactor: Use functional design for the authentication of apps

packages/backend/src/apps/twitter2/auth/verify-credentials.ts

@@ -0,0 +1,21 @@
+const verifyCredentials = async ($: any) => {
+  try {
+    const response = await $.http.post(
+      `/oauth/access_token?oauth_verifier=${$.auth.oauthVerifier}&oauth_token=${$.auth.accessToken}`,
+      null
+    );
+
+    const responseData = Object.fromEntries(new URLSearchParams(response.data));
+
+    await $.auth.set({
+      accessToken: responseData.oauth_token,
+      accessSecret: responseData.oauth_token_secret,
+      userId: responseData.user_id,
+      screenName: responseData.screen_name,
+    });
+  } catch (error) {
+    throw new Error(error.response.data);
+  }
+};
+
+export default verifyCredentials;