openapi.json: oauth2 securityDefinitions 'firebase-##' #158

"securityDefinitions": {
  "firebase-115e09da": {
   "type": "oauth2",
   "authorizationUrl": "",
   "flow": "implicit",
   "x-google-issuer": "https://securetoken.google.com/project-id",
   "x-google-jwks_uri": "https://www.googleapis.com/robot/v1/metadata/x509/securetoken@system.gserviceaccount.com",
   "x-google-audiences": "project-id"
  },
  "api_key": {
   "type": "apiKey",
   "name": "key",
   "in": "query"
  }
 },

@Api(
  name           = "name",
  title          = "Project Title",
  version        = "v1",
  description    = "Project Description",
  apiKeyRequired = AnnotationBoolean.TRUE,
  authenticators = {EspAuthenticator.class},
  clientIds      = {
    Constant.API_EXPLORER_CLIENT_ID
  }, // clientIds //
  namespace = @ApiNamespace(
    ownerDomain = Core.PROJECT_DOMAIN,
    ownerName   = Core.PROJECT_DOMAIN,
    packagePath = ""
  ), // namespace //
  issuers = {
    @ApiIssuer(
      name    = "firebase",
      issuer  = "https://securetoken.google.com/" + Core.PROJECT_ID,
      jwksUri = "https://www.googleapis.com/robot/v1/metadata/x509/securetoken@system.gserviceaccount.com"
    ) // ApiIssuer //
  }, // issuers //
  issuerAudiences = {
    @ApiIssuerAudience(name = "firebase", audiences = Core.PROJECT_ID)
  } // issuerAudiences //
) // Api //