refactor: Use functional design for the authentication of apps

packages/backend/src/apps/twitter2/common/oauth-client/index.ts

@@ -0,0 +1,22 @@
+import crypto from 'crypto';
+import OAuth from 'oauth-1.0a';
+
+const oauthClient = ($: any) => {
+  const consumerData = {
+    key: $.auth.consumerKey as string,
+    secret: $.auth.consumerSecret as string,
+  };
+
+  return new OAuth({
+    consumer: consumerData,
+    signature_method: 'HMAC-SHA1',
+    hash_function(base_string, key) {
+      return crypto
+        .createHmac('sha1', key)
+        .update(base_string)
+        .digest('base64');
+    },
+  });
+};
+
+export default oauthClient;