refactor: Use functional design for the authentication of apps

packages/backend/src/apps/twitter2/auth/create-auth-data.ts

@@ -0,0 +1,43 @@
+import { IJSONObject, IField } from '@automatisch/types';
+import oauthClient from '../common/oauth-client';
+import { URLSearchParams } from 'url';
+
+export default async function createAuthData($: any) {
+  try {
+    const oauthRedirectUrlField = $.app.fields.find(
+      (field: IField) => field.key == 'oAuthRedirectUrl'
+    );
+
+    const callbackUrl = oauthRedirectUrlField.value;
+
+    const requestData = {
+      url: `${$.app.baseUrl}/oauth/request_token`,
+      method: 'POST',
+      data: { oauth_callback: callbackUrl },
+    };
+
+    const authHeader = oauthClient($).toHeader(
+      oauthClient($).authorize(requestData)
+    );
+
+    const response = await $.http.post(`/oauth/request_token`, null, {
+      headers: { ...authHeader },
+    });
+
+    const responseData = Object.fromEntries(new URLSearchParams(response.data));
+
+    await $.auth.set({
+      url: `${$.app.baseUrl}/oauth/authorize?oauth_token=${responseData.oauth_token}`,
+      accessToken: responseData.oauth_token,
+      accessSecret: responseData.oauth_token_secret,
+    });
+  } catch (error) {
+    const errorMessages = error.response.data.errors
+      .map((error: IJSONObject) => error.message)
+      .join(' ');
+
+    throw new Error(
+      `Error occured while verifying credentials: ${errorMessages}`
+    );
+  }
+}