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|
package config
import (
"os"
"strconv"
"strings"
"github.com/hashicorp/go-multierror"
"github.com/homemade/scl"
"github.com/nsheridan/cashier/server/helpers/vault"
"github.com/pkg/errors"
)
// Config holds the final server configuration.
type Config struct {
Server *Server `hcl:"server"`
Auth *Auth `hcl:"auth"`
SSH *SSH `hcl:"ssh"`
AWS *AWS `hcl:"aws"`
Vault *Vault `hcl:"vault"`
}
// Database holds database configuration.
type Database map[string]string
// Server holds the configuration specific to the web server and sessions.
type Server struct {
UseTLS bool `hcl:"use_tls"`
TLSKey string `hcl:"tls_key"`
TLSCert string `hcl:"tls_cert"`
LetsEncryptServername string `hcl:"letsencrypt_servername"`
LetsEncryptCache string `hcl:"letsencrypt_cachedir"`
Addr string `hcl:"address"`
Port int `hcl:"port"`
User string `hcl:"user"`
CookieSecret string `hcl:"cookie_secret"`
CSRFSecret string `hcl:"csrf_secret"`
HTTPLogFile string `hcl:"http_logfile"`
Database Database `hcl:"database"`
}
// Auth holds the configuration specific to the OAuth provider.
type Auth struct {
OauthClientID string `hcl:"oauth_client_id"`
OauthClientSecret string `hcl:"oauth_client_secret"`
OauthCallbackURL string `hcl:"oauth_callback_url"`
Provider string `hcl:"provider"`
ProviderOpts map[string]string `hcl:"provider_opts"`
UsersWhitelist []string `hcl:"users_whitelist"`
}
// SSH holds the configuration specific to signing ssh keys.
type SSH struct {
SigningKey string `hcl:"signing_key"`
AdditionalPrincipals []string `hcl:"additional_principals"`
MaxAge string `hcl:"max_age"`
Permissions []string `hcl:"permissions"`
}
// AWS holds Amazon AWS configuration.
// AWS can also be configured using SDK methods.
type AWS struct {
Region string `hcl:"region"`
AccessKey string `hcl:"access_key"`
SecretKey string `hcl:"secret_key"`
}
// Vault holds Hashicorp Vault configuration.
type Vault struct {
Address string `hcl:"address"`
Token string `hcl:"token"`
}
func verifyConfig(c *Config) error {
var err error
if c.SSH == nil {
err = multierror.Append(err, errors.New("missing ssh config section"))
}
if c.Auth == nil {
err = multierror.Append(err, errors.New("missing auth config section"))
}
if c.Server == nil {
err = multierror.Append(err, errors.New("missing server config section"))
}
return err
}
func setFromEnvironment(c *Config) {
port, err := strconv.Atoi(os.Getenv("PORT"))
if err == nil {
c.Server.Port = port
}
if os.Getenv("OAUTH_CLIENT_ID") != "" {
c.Auth.OauthClientID = os.Getenv("OAUTH_CLIENT_ID")
}
if os.Getenv("OAUTH_CLIENT_SECRET") != "" {
c.Auth.OauthClientSecret = os.Getenv("OAUTH_CLIENT_SECRET")
}
if os.Getenv("CSRF_SECRET") != "" {
c.Server.CSRFSecret = os.Getenv("CSRF_SECRET")
}
if os.Getenv("COOKIE_SECRET") != "" {
c.Server.CookieSecret = os.Getenv("COOKIE_SECRET")
}
}
func setFromVault(c *Config) error {
if c.Vault == nil || c.Vault.Token == "" || c.Vault.Address == "" {
return nil
}
v, err := vault.NewClient(c.Vault.Address, c.Vault.Token)
if err != nil {
return errors.Wrap(err, "vault error")
}
var errs error
get := func(value string) string {
if strings.HasPrefix(value, "/vault/") {
s, err := v.Read(value)
if err != nil {
errs = multierror.Append(errs, err)
}
return s
}
return value
}
c.Auth.OauthClientID = get(c.Auth.OauthClientID)
c.Auth.OauthClientSecret = get(c.Auth.OauthClientSecret)
c.Server.CSRFSecret = get(c.Server.CSRFSecret)
c.Server.CookieSecret = get(c.Server.CookieSecret)
if len(c.Server.Database) != 0 {
c.Server.Database["password"] = get(c.Server.Database["password"])
}
if c.AWS != nil {
c.AWS.AccessKey = get(c.AWS.AccessKey)
c.AWS.SecretKey = get(c.AWS.SecretKey)
}
return errors.Wrap(errs, "errors reading from vault")
}
// ReadConfig parses a hcl configuration file into a Config struct.
func ReadConfig(f string) (*Config, error) {
config := &Config{}
if err := scl.DecodeFile(config, f); err != nil {
return nil, errors.Wrapf(err, "unable to load config from file %s", f)
}
if err := setFromVault(config); err != nil {
return nil, err
}
setFromEnvironment(config)
if err := verifyConfig(config); err != nil {
return nil, errors.Wrap(err, "unable to verify config")
}
return config, nil
}
|
