feat: support s3 response templates

Author: mfogel

lib/apiGateway/schema.js

@@ -267,7 +267,8 @@ const proxiesSchemas = {
         })
       }),
       requestParameters,
-      request
+      request,
+      response: extendedResponse
     })
   }),
   sns: Joi.object({

lib/package/s3/compileMethodsToS3.js

@@ -119,6 +119,11 @@ module.exports = {
     }
   },
 
+  getS3IntegrationResponseTemplate(http, statusType) {
+    const template = _.get(http, ['response', 'template', statusType])
+    return Object.assign({}, template && { 'application/json': template })
+  },
+
   getS3MethodIntegration(http) {
     const bucket = http.bucket
     const httpMethod = this.getIntegrationHttpMethod(http)
@@ -172,19 +177,19 @@ module.exports = {
           StatusCode: 400,
           SelectionPattern: '4\\d{2}',
           ResponseParameters: {},
-          ResponseTemplates: {}
+          ResponseTemplates: this.getS3IntegrationResponseTemplate(http, 'clientError')
         },
         {
           StatusCode: 500,
           SelectionPattern: '5\\d{2}',
           ResponseParameters: {},
-          ResponseTemplates: {}
+          ResponseTemplates: this.getS3IntegrationResponseTemplate(http, 'serverError')
         },
         {
           StatusCode: 200,
           SelectionPattern: '2\\d{2}',
           ResponseParameters: responseParams,
-          ResponseTemplates: {}
+          ResponseTemplates: this.getS3IntegrationResponseTemplate(http, 'success')
         }
       ]
     }