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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"`
// Port is the tcp port number or service name the web server will listen to
Port string `yaml:"port"`
// Token is the sncf api token
Token string `yaml:"token"`
}
func (c *Config) validate() error {
// address
if c.Address == "" {
c.Address = "127.0.0.1"
}
if ip := net.ParseIP(c.Address); ip == nil {
if _, err := net.LookupIP(c.Address); err != nil {
return newInvalidAddressError(c.Address, err)
}
}
// port
if c.Port == "" {
c.Port = "8080"
}
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
}
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