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package config
import (
"errors"
"io"
"os"
"strconv"
"github.com/hashicorp/go-multierror"
"github.com/nsheridan/cashier/server/helpers/vault"
"github.com/spf13/viper"
)
// Config holds the server configuration.
type Config struct {
Server *Server `mapstructure:"server"`
Auth *Auth `mapstructure:"auth"`
SSH *SSH `mapstructure:"ssh"`
AWS *AWS `mapstructure:"aws"`
Vault *Vault `mapstructure:"vault"`
}
// unmarshalled holds the raw config.
type unmarshalled struct {
Server []Server `mapstructure:"server"`
Auth []Auth `mapstructure:"auth"`
SSH []SSH `mapstructure:"ssh"`
AWS []AWS `mapstructure:"aws"`
Vault []Vault `mapstructure:"vault"`
}
// Server holds the configuration specific to the web server and sessions.
type Server struct {
UseTLS bool `mapstructure:"use_tls"`
TLSKey string `mapstructure:"tls_key"`
TLSCert string `mapstructure:"tls_cert"`
Addr string `mapstructure:"address"`
Port int `mapstructure:"port"`
User string `mapstructure:"user"`
CookieSecret string `mapstructure:"cookie_secret"`
CSRFSecret string `mapstructure:"csrf_secret"`
HTTPLogFile string `mapstructure:"http_logfile"`
Datastore string `mapstructure:"datastore"`
}
// Auth holds the configuration specific to the OAuth provider.
type Auth struct {
OauthClientID string `mapstructure:"oauth_client_id"`
OauthClientSecret string `mapstructure:"oauth_client_secret"`
OauthCallbackURL string `mapstructure:"oauth_callback_url"`
Provider string `mapstructure:"provider"`
ProviderOpts map[string]string `mapstructure:"provider_opts"`
UsersWhitelist []string `mapstructure:"users_whitelist"`
}
// SSH holds the configuration specific to signing ssh keys.
type SSH struct {
SigningKey string `mapstructure:"signing_key"`
AdditionalPrincipals []string `mapstructure:"additional_principals"`
MaxAge string `mapstructure:"max_age"`
Permissions []string `mapstructure:"permissions"`
}
// AWS holds Amazon AWS configuration.
// AWS can also be configured using SDK methods.
type AWS struct {
Region string `mapstructure:"region"`
AccessKey string `mapstructure:"access_key"`
SecretKey string `mapstructure:"secret_key"`
}
// Vault holds Hashicorp Vault configuration.
type Vault struct {
Address string `mapstructure:"address"`
Token string `mapstructure:"token"`
}
func verifyConfig(u *unmarshalled) error {
var err error
if len(u.SSH) == 0 {
err = multierror.Append(errors.New("missing ssh config section"))
}
if len(u.Auth) == 0 {
err = multierror.Append(errors.New("missing auth config section"))
}
if len(u.Server) == 0 {
err = multierror.Append(errors.New("missing server config section"))
}
if len(u.AWS) == 0 {
// AWS config is optional
u.AWS = append(u.AWS, AWS{})
}
if len(u.Vault) == 0 {
// Vault config is optional
u.Vault = append(u.Vault, Vault{})
}
return err
}
func setFromEnv(u *unmarshalled) {
port, err := strconv.Atoi(os.Getenv("PORT"))
if err == nil {
u.Server[0].Port = port
}
if os.Getenv("DATASTORE") != "" {
u.Server[0].Datastore = os.Getenv("DATASTORE")
}
if os.Getenv("OAUTH_CLIENT_ID") != "" {
u.Auth[0].OauthClientID = os.Getenv("OAUTH_CLIENT_ID")
}
if os.Getenv("OAUTH_CLIENT_SECRET") != "" {
u.Auth[0].OauthClientSecret = os.Getenv("OAUTH_CLIENT_SECRET")
}
if os.Getenv("CSRF_SECRET") != "" {
u.Server[0].CSRFSecret = os.Getenv("CSRF_SECRET")
}
if os.Getenv("COOKIE_SECRET") != "" {
u.Server[0].CookieSecret = os.Getenv("COOKIE_SECRET")
}
}
func setFromVault(u *unmarshalled) error {
if len(u.Vault) == 0 || u.Vault[0].Token == "" || u.Vault[0].Address == "" {
return nil
}
v, err := vault.NewClient(u.Vault[0].Address, u.Vault[0].Token)
if err != nil {
return err
}
get := func(value string) (string, error) {
if value[:7] == "/vault/" {
return v.Read(value)
}
return value, nil
}
if len(u.Auth) > 0 {
u.Auth[0].OauthClientID, err = get(u.Auth[0].OauthClientID)
if err != nil {
err = multierror.Append(err)
}
u.Auth[0].OauthClientSecret, err = get(u.Auth[0].OauthClientSecret)
if err != nil {
err = multierror.Append(err)
}
}
if len(u.Server) > 0 {
u.Server[0].CSRFSecret, err = get(u.Server[0].CSRFSecret)
if err != nil {
err = multierror.Append(err)
}
u.Server[0].CookieSecret, err = get(u.Server[0].CookieSecret)
if err != nil {
err = multierror.Append(err)
}
}
if len(u.AWS) > 0 {
u.AWS[0].AccessKey, err = get(u.AWS[0].AccessKey)
if err != nil {
err = multierror.Append(err)
}
u.AWS[0].SecretKey, err = get(u.AWS[0].SecretKey)
if err != nil {
err = multierror.Append(err)
}
}
return err
}
// ReadConfig parses a JSON configuration file into a Config struct.
func ReadConfig(r io.Reader) (*Config, error) {
u := &unmarshalled{}
v := viper.New()
v.SetConfigType("hcl")
if err := v.ReadConfig(r); err != nil {
return nil, err
}
if err := v.Unmarshal(u); err != nil {
return nil, err
}
setFromEnv(u)
if err := setFromVault(u); err != nil {
return nil, err
}
if err := verifyConfig(u); err != nil {
return nil, err
}
return &Config{
Server: &u.Server[0],
Auth: &u.Auth[0],
SSH: &u.SSH[0],
AWS: &u.AWS[0],
Vault: &u.Vault[0],
}, nil
}
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