package config import ( "net" "os" "regexp" "gopkg.in/yaml.v3" ) var validToken = regexp.MustCompile(`^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$`) type Config struct { // Address is the hostname or ip the web server will listen to Address string `yaml:"address",default:"127.0.0.1"` Port string `yaml:"port",default:"8080"` // Token is the sncf api token Token string `yaml:"token"` } func (c *Config) validate() error { // address if ip := net.ParseIP(c.Address); ip == nil { if _, err := net.LookupIP(c.Address); err != nil { return newInvalidAddressError(c.Address, err) } } // port if _, err := net.LookupPort("tcp", c.Port); err != nil { return newInvalidPortError(c.Port, err) } // token if ok := validToken.MatchString(c.Token); !ok { return newInvalidTokenError(c.Token) } return nil } // LoadFile loads the c from a given file func LoadFile(path string) (*Config, error) { var c *Config f, errOpen := os.Open(path) if errOpen != nil { return nil, newOpenError(path, errOpen) } defer f.Close() decoder := yaml.NewDecoder(f) if err := decoder.Decode(&c); err != nil { return nil, newDecodeError(path, err) } if err := c.validate(); err != nil { return nil, err } return c, nil }