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package config
import (
"errors"
"fmt"
"io"
"log"
"os"
"strconv"
"strings"
"github.com/hashicorp/go-multierror"
"github.com/mitchellh/mapstructure"
"github.com/nsheridan/cashier/server/helpers/vault"
"github.com/spf13/viper"
)
// Config holds the final 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"`
}
// 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 `mapstructure:"use_tls"`
TLSKey string `mapstructure:"tls_key"`
TLSCert string `mapstructure:"tls_cert"`
LetsEncryptServername string `mapstructure:"letsencrypt_servername"`
LetsEncryptCache string `mapstructure:"letsencrypt_cachedir"`
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"`
Database Database `mapstructure:"database"`
Datastore string `mapstructure:"datastore"` // Deprecated. TODO: remove.
}
// 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(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 convertDatastoreConfig(c *Config) {
// Convert the deprecated 'datastore' config to the new 'database' config.
if c.Server != nil && c.Server.Datastore != "" {
conf := c.Server.Datastore
engine := strings.Split(conf, ":")[0]
switch engine {
case "mysql", "mongo":
s := strings.SplitN(conf, ":", 4)
engine, user, passwd, addrs := s[0], s[1], s[2], s[3]
c.Server.Database = map[string]string{
"type": engine,
"username": user,
"password": passwd,
"address": addrs,
}
case "sqlite":
s := strings.Split(conf, ":")
c.Server.Database = map[string]string{"type": s[0], "filename": s[1]}
case "mem":
c.Server.Database = map[string]string{"type": "mem"}
}
log.Println("The `datastore` option has been deprecated in favour of the `database` option. You should update your config.")
log.Println("The new config (passwords have been redacted) should look something like:")
fmt.Printf("server {\n database {\n")
for k, v := range c.Server.Database {
if v == "" {
continue
}
if k == "password" {
fmt.Printf(" password = \"[ REDACTED ]\"\n")
continue
}
fmt.Printf(" %s = \"%s\"\n", k, v)
}
fmt.Printf(" }\n}\n")
}
}
func setFromEnvironment(c *Config) {
port, err := strconv.Atoi(os.Getenv("PORT"))
if err == nil {
c.Server.Port = port
}
if os.Getenv("DATASTORE") != "" {
c.Server.Datastore = os.Getenv("DATASTORE")
}
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 err
}
var errors error
get := func(value string) string {
if strings.HasPrefix(value, "/vault/") {
s, err := v.Read(value)
if err != nil {
errors = multierror.Append(errors, 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
}
// Unmarshal the config into a *Config
func decode() (*Config, error) {
var errors error
config := &Config{}
configPieces := map[string]interface{}{
"auth": &config.Auth,
"aws": &config.AWS,
"server": &config.Server,
"ssh": &config.SSH,
"vault": &config.Vault,
}
for key, val := range configPieces {
conf, ok := viper.Get(key).([]map[string]interface{})
if !ok {
continue
}
if err := mapstructure.WeakDecode(conf[0], val); err != nil {
errors = multierror.Append(errors, err)
}
}
return config, errors
}
// ReadConfig parses a hcl configuration file into a Config struct.
func ReadConfig(r io.Reader) (*Config, error) {
viper.SetConfigType("hcl")
if err := viper.ReadConfig(r); err != nil {
return nil, err
}
config, err := decode()
if err != nil {
return nil, err
}
if err := setFromVault(config); err != nil {
return nil, err
}
setFromEnvironment(config)
convertDatastoreConfig(config)
if err := verifyConfig(config); err != nil {
return nil, err
}
return config, nil
}
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