{
  "$schema": "http://json-schema.org/schema#", 
  "type": "object", 
  "description": "UserInfo holds the information about the user needed to implement the user.Info interface.", 
  "properties": {
    "username": {
      "type": [
        "string", 
        "null"
      ], 
      "description": "The name that uniquely identifies this user among all active users."
    }, 
    "uid": {
      "type": [
        "string", 
        "null"
      ], 
      "description": "A unique value that identifies this user across time. If this user is deleted and another user by the same name is added, they will have different UIDs."
    }, 
    "groups": {
      "items": {
        "type": [
          "string", 
          "null"
        ]
      }, 
      "type": [
        "array", 
        "null"
      ], 
      "description": "The names of groups this user is a part of."
    }, 
    "extra": {
      "additionalProperties": {
        "items": {
          "type": [
            "string", 
            "null"
          ]
        }, 
        "type": [
          "array", 
          "null"
        ]
      }, 
      "type": "object", 
      "description": "Any additional information provided by the authenticator."
    }
  }
}