package config import ( "context" "errors" "fmt" "log" "reflect" "strings" "time" "github.com/heetch/confita" "github.com/heetch/confita/backend" "github.com/heetch/confita/backend/env" "github.com/heetch/confita/backend/flags" ) // Config is the exporter CLI configuration. type Config struct { PIHoleProtocol string `config:"pihole_protocol"` PIHoleHostname string `config:"pihole_hostname"` PIHolePort uint16 `config:"pihole_port"` PIHolePassword string `config:"pihole_password"` PIHoleApiToken string `config:"pihole_api_token"` } type EnvConfig struct { PIHoleProtocol []string `config:"pihole_protocol"` PIHoleHostname []string `config:"pihole_hostname"` PIHolePort []uint16 `config:"pihole_port"` PIHolePassword []string `config:"pihole_password"` PIHoleApiToken []string `config:"pihole_api_token"` Port uint16 `config:"port"` Interval time.Duration `config:"interval"` } func getDefaultEnvConfig() *EnvConfig { return &EnvConfig{ PIHoleProtocol: []string{"http"}, PIHoleHostname: []string{"127.0.0.1"}, PIHolePort: []uint16{80}, PIHolePassword: []string{}, PIHoleApiToken: []string{}, Port: 9617, Interval: 10 * time.Second, } } // Load method loads the configuration by using both flag or environment variables. func Load() (*EnvConfig, []Config, error) { loaders := []backend.Backend{ env.NewBackend(), flags.NewBackend(), } loader := confita.NewLoader(loaders...) cfg := getDefaultEnvConfig() err := loader.Load(context.Background(), cfg) if err != nil { panic(err) } cfg.show() if clientsConfig, err := cfg.Split(); err != nil { return cfg, nil, err } else { return cfg, clientsConfig, nil } } func (c *Config) String() string { ref := reflect.ValueOf(c) fields := ref.Elem() buffer := make([]string, fields.NumField(), fields.NumField()) for i := 0; i < fields.NumField(); i++ { valueField := fields.Field(i) typeField := fields.Type().Field(i) buffer[i] = fmt.Sprintf("%s=%v", typeField.Name, valueField.Interface()) } return fmt.Sprintf("", &c, strings.Join(buffer, ", ")) } //Validate check if the config is valid func (c Config) Validate() error { if c.PIHoleProtocol != "http" && c.PIHoleProtocol != "https" { return fmt.Errorf("protocol %s is invalid. Must be http or https", c.PIHoleProtocol) } return nil } func (c EnvConfig) Split() ([]Config, error) { hostsCount := len(c.PIHoleHostname) result := make([]Config, 0, hostsCount) for i, hostname := range c.PIHoleHostname { config := Config{ PIHoleHostname: strings.TrimSpace(hostname), } if len(c.PIHolePort) == 1 { config.PIHolePort = c.PIHolePort[0] } else if len(c.PIHolePort) == hostsCount { config.PIHolePort = c.PIHolePort[i] } else if len(c.PIHolePort) != 0 { return nil, errors.New("Wrong number of ports. Port can be empty to use default, one value to use for all hosts, or match the number of hosts") } if hasData, data, isValid := extractStringConfig(c.PIHoleProtocol, i, hostsCount); hasData { config.PIHoleProtocol = data } else if !isValid { return nil, errors.New("Wrong number of PIHoleProtocol. PIHoleProtocol can be empty to use default, one value to use for all hosts, or match the number of hosts") } if hasData, data, isValid := extractStringConfig(c.PIHoleApiToken, i, hostsCount); hasData { config.PIHoleApiToken = data } else if !isValid { return nil, errors.New(fmt.Sprintf("Wrong number of PIHoleApiToken %d (Hosts: %d). PIHoleApiToken can be empty to use default, one value to use for all hosts, or match the number of hosts", len(c.PIHoleApiToken), hostsCount)) } if hasData, data, isValid := extractStringConfig(c.PIHolePassword, i, hostsCount); hasData { config.PIHolePassword = data } else if !isValid { return nil, errors.New("Wrong number of PIHolePassword. PIHolePassword can be empty to use default, one value to use for all hosts, or match the number of hosts") } result = append(result, config) } return result, nil } func extractStringConfig(data []string, idx int, hostsCount int) (bool, string, bool) { if len(data) == 1 { v := strings.TrimSpace(data[0]) if v != "" { return true, v, true } } else if len(data) == hostsCount { v := strings.TrimSpace(data[idx]) if v != "" { return true, v, true } } else if len(data) != 0 { //Host count missmatch return false, "", false } // Empty return false, "", true } func (c Config) hostnameURL() string { s := fmt.Sprintf("%s://%s", c.PIHoleProtocol, c.PIHoleHostname) if c.PIHolePort != 0 { s += fmt.Sprintf(":%d", c.PIHolePort) } return s } //PIHoleStatsURL returns the stats url func (c Config) PIHoleStatsURL() string { return c.hostnameURL() + "/admin/api.php?summaryRaw&overTimeData&topItems&recentItems&getQueryTypes&getForwardDestinations&getQuerySources&jsonForceObject" } //PIHoleLoginURL returns the login url func (c Config) PIHoleLoginURL() string { return c.hostnameURL() + "/admin/index.php?login" } func (c EnvConfig) show() { val := reflect.ValueOf(&c).Elem() log.Println("------------------------------------") log.Println("- PI-Hole exporter configuration -") log.Println("------------------------------------") for i := 0; i < val.NumField(); i++ { valueField := val.Field(i) typeField := val.Type().Field(i) // Do not print password or api token but do print the authentication method if typeField.Name != "PIHolePassword" && typeField.Name != "PIHoleApiToken" { log.Println(fmt.Sprintf("%s : %v", typeField.Name, valueField.Interface())) } else { showAuthenticationMethod(typeField.Name, valueField.Len()) } } log.Println("------------------------------------") } func showAuthenticationMethod(name string, length int) { if length > 0 { log.Println(fmt.Sprintf("Pi-Hole Authentication Method : %s", name)) } }