use firs item from origins array (#406)

Author: pablomendezroyo

packages/brain/src/modules/apiServers/brain/startBrainApi.ts

@@ -12,7 +12,7 @@ export function startBrainApi({
   allowedOriginsFromEnv
 }: {
   brainDb: BrainDataBase;
-  allowedOriginsFromEnv: string[] | null;
+  allowedOriginsFromEnv: string | string[] | null;
 }): http.Server {
   const app = express();
   app.use(express.json());

packages/brain/src/modules/apiServers/index.ts

@@ -32,7 +32,7 @@ export const getServers = ({
   beaconchainApi: BeaconchainApi;
   brainDb: BrainDataBase;
   reloadValidatorsCronTask: CronJob;
-  allowedOriginsFromEnv: string[] | null;
+  allowedOriginsFromEnv: string | string[] | null;
 }): {
   uiServer: http.Server;
   launchpadServer: http.Server;

packages/brain/src/modules/apiServers/launchpad/startLaunchpadApi.ts

@@ -29,7 +29,7 @@ export function startLaunchpadApi({
   brainDb: BrainDataBase;
   network: Network;
   signerUrl: string;
-  allowedOriginsFromEnv: string[] | null;
+  allowedOriginsFromEnv: string | string[] | null;
 }): http.Server {
   const app = express();
   app.use(express.json());

packages/brain/src/modules/apiServers/ui/startUiServer.ts

@@ -51,7 +51,7 @@ export function startUiServer({
   uiBuildPath: string;
   brainConfig: BrainConfig;
   reloadValidatorsCronTask: CronJob;
-  allowedOriginsFromEnv: string[] | null;
+  allowedOriginsFromEnv: string | string[] | null;
 }): http.Server {
   const { network } = brainConfig.chain;
   // create index.html modified with network

packages/brain/src/modules/config/loadEnvs.ts

@@ -5,7 +5,7 @@ export function loadEnvs(): {
   executionClient: ExecutionClient;
   consensusClient: ConsensusClient;
   isMevBoostSet: boolean;
-  cors: string[] | null;
+  cors: string | string[] | null;
 } {
   const network = getNetwork();
 
@@ -14,12 +14,19 @@ export function loadEnvs(): {
 
   const isMevBoostSet = process.env[`_DAPPNODE_GLOBAL_MEVBOOST_${network.toUpperCase()}`] === "true";
 
+  const origins = process.env.CORS ? process.env.CORS.split(",") : null;
+  let cors: string | string[] | null = null;
+  if (origins) {
+    if (origins.length > 1) cors = origins;
+    else if (origins.length === 1) cors = origins[0];
+  }
+
   return {
     network: network as Network,
     executionClient,
     consensusClient,
     isMevBoostSet,
-    cors: process.env.CORS ? process.env.CORS.split(",") : null
+    cors
   };
 }
 

packages/brain/src/modules/config/types.ts

@@ -17,7 +17,7 @@ export interface ApisConfig {
   token: string;
   tlsCert: Buffer | null;
   host: string;
-  cors: string[] | null;
+  cors: string | string[] | null;
 }
 
 export interface ChainConfig {