json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "type": "object",
      "properties": {
          "status": {
              "type": "string"
          },
          "data": {
              "type": "object",
              "properties": {
                  "client_token": {
                      "type": "object",
                      "properties": {
                          "client_token": {
                              "type": "string"
                          },
                          "policies": {
                              "type": "array",
                              "items": {
                                  "type": "string"
                              }
                          },
                          "metadata": {
                              "type": "object",
                              "properties": {
                                  "username": {
                                      "type": "string"
                                  },
                                  "is_admin": {
                                      "type": "string"
                                  },
                                  "groups": {
                                      "type": "string"
                                  }
                              },
                              "required": [
                                  "username",
                                  "is_admin",
                                  "groups"
                              ]
                          },
                          "lease_duration": {
                              "type": "integer"
                          },
                          "renewable": {
                              "type": "boolean"
                          }
                      },
                      "required": [
                          "client_token",
                          "policies",
                          "metadata",
                          "lease_duration",
                          "renewable"
                      ]
                  }
              },
              "required": [
                  "client_token"
              ]
          }
      },
      "required": [
          "status",
          "data"
      ]
  }