Given the example below, where a swagger.json file specifies security definitions but no security tag to operations, could be useful to allow to specify a default auth type during the OpenAPI codegen.

"securityDefinitions": {
  "basic": {
    "type": "basic"
  }
},
"swagger": "2.0" 

As an workaround, we can tweak the schema so basic auth is used in all operations:

"securityDefinitions": {
  "basic": {
    "type": "basic"
  }
},
"security": [
  {
    "basic": []
  }
],
"swagger": "2.0"