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package config
import (
"net"
"os"
"regexp"
"github.com/pkg/errors"
"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 errors.New("Invalid address " + c.Address + ", it must be a valid ipv4 address, ipv6 address, or resolvable name.")
}
}
// port
if _, err := net.LookupPort("tcp", c.Port); err != nil {
return errors.New("Invalid port " + c.Port + ", it must be a valid port number or tcp service name. Got error : " + err.Error())
}
// token
if ok := validToken.MatchString(c.Token); !ok {
return errors.New("Invalid token, must be an hexadecimal string that lookslike 12345678-9abc-def0-1234-56789abcdef0, got " + c.Token + " instead.")
}
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, errors.Wrapf(errOpen, "Failed to open configuration file %s", path)
}
defer f.Close()
decoder := yaml.NewDecoder(f)
if err := decoder.Decode(&c); err != nil {
return nil, errors.Wrap(err, "Failed to decode configuration file")
}
if err := c.validate(); err != nil {
return nil, errors.Wrap(err, "Failed to validate configuration")
}
return c, nil
}
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