refactor: switch common function for cors

Author: horike37

README.md

@@ -306,7 +306,7 @@ curl https://xxxxxx.execute-api.us-east-1.amazonaws.com/dev/sns -d '{"message":
 
 ### DynamoDB
 
-Sample syntax for DynamoDB proxy in `serverless.yml`. Currently, the supported (DynamoDB Operations)[https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_Operations.html] are `PutItem`, `GetItem` and `DeleteItem`.
+Sample syntax for DynamoDB proxy in `serverless.yml`. Currently, the supported [DynamoDB Operations](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_Operations.html) are `PutItem`, `GetItem` and `DeleteItem`.
 
 ```yaml
 custom:

lib/package/dynamodb/compileMethodsToDynamodb.js

@@ -84,18 +84,7 @@ module.exports = {
       ]
     }
 
-    if (http && http.cors) {
-      let origin = http.cors.origin
-      if (http.cors.origins && http.cors.origins.length) {
-        origin = http.cors.origins.join(',')
-      }
-
-      integrationResponse.IntegrationResponses.forEach(async (val, i) => {
-        integrationResponse.IntegrationResponses[i].ResponseParameters = {
-          'method.response.header.Access-Control-Allow-Origin': `'${origin}'`
-        }
-      })
-    }
+    this.addCors(http, integrationResponse)
 
     _.merge(integration, integrationResponse)