fix: allow copeland voting method only on testnet (#505)

Author: ChaituVR

src/writer/proposal.ts

@@ -10,6 +10,9 @@ import db from '../helpers/mysql';
 import { getLimits, getSpaceType } from '../helpers/options';
 import { captureError, getQuorum, jsonParse, validateChoices } from '../helpers/utils';
 
+const SNAPSHOT_ENV = process.env.NETWORK || 'testnet';
+const TESTNET_ONLY_VOTING_TYPES = ['copeland'];
+
 const scoreAPIUrl = process.env.SCORE_API_URL || 'https://score.snapshot.org';
 const broviderUrl = process.env.BROVIDER_URL || 'https://rpc.snapshot.org';
 
@@ -90,6 +93,10 @@ export async function verify(body): Promise<any> {
     return Promise.reject('proposal end date must be in the future');
   }
 
+  if (SNAPSHOT_ENV !== 'testnet' && TESTNET_ONLY_VOTING_TYPES.includes(msg.payload.type)) {
+    return Promise.reject('voting type allowed only on testnet');
+  }
+
   const isChoicesValid = validateChoices({
     type: msg.payload.type,
     choices: msg.payload.choices