Function DetermineAdminAPIAddress

cmd/commandfuncs.go:862–904

DetermineAdminAPIAddress determines which admin API endpoint address should be used based on the inputs. By priority: if `address` is specified, then it is returned; if `config` is specified, then that config will be used for finding the admin address; if `configFile` (and `configAdapter`) are speci

(address string, config []byte, configFile, configAdapter string)

// then that config will be loaded to find the admin address; otherwise, the
// default admin listen address will be returned.
func DetermineAdminAPIAddress(address string, config []byte, configFile, configAdapter string) (string, error) {
	// Prefer the address if specified and non-empty
	if address != "" {
		return address, nil
	}

	// Try to load the config from file if specified, with the given adapter name
	if configFile != "" {
		var loadedConfigFile string
		var err error

		// use the provided loaded config if non-empty
		// otherwise, load it from the specified file/adapter
		loadedConfig := config
		if len(loadedConfig) == 0 {
			// get the config in caddy's native format
			loadedConfig, loadedConfigFile, _, err = LoadConfig(configFile, configAdapter)
			if err != nil {
				return "", err
			}
			if loadedConfigFile == "" {
				return "", fmt.Errorf("no config file to load; either use --config flag or ensure Caddyfile exists in current directory")
			}
		}

		// get the address of the admin listener from the config
		if len(loadedConfig) > 0 {
			var tmpStruct struct {
				Admin caddy.AdminConfig `json:"admin"`
			}
			err := json.Unmarshal(loadedConfig, &tmpStruct)
			if err != nil {
				return "", fmt.Errorf("unmarshaling admin listener address from config: %v", err)
			}
			if tmpStruct.Admin.Listen != "" {
				return tmpStruct.Admin.Listen, nil
			}
		}
	}

	// Fallback to the default listen address otherwise
	return caddy.DefaultAdminListen, nil
}

// configFileWithRespectToDefault returns the filename to use for loading the config, based
// on whether a config file is already specified and a supported default config file exists.