aboutsummaryrefslogtreecommitdiff
path: root/server/config/config.go
blob: 3587e9fa806449465d8298a99a84eaee8e3198cd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
package config

import (
	"errors"
	"io"
	"os"
	"strconv"

	"github.com/hashicorp/go-multierror"
	"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"`
}

// unmarshalled holds the raw config.
type unmarshalled struct {
	Server []Server `mapstructure:"server"`
	Auth   []Auth   `mapstructure:"auth"`
	SSH    []SSH    `mapstructure:"ssh"`
	AWS    []AWS    `mapstructure:"aws"`
}

// 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"`
}

func verifyConfig(u *unmarshalled) error {
	var err error
	if len(u.SSH) == 0 {
		err = multierror.Append(errors.New("missing ssh config block"))
	}
	if len(u.Auth) == 0 {
		err = multierror.Append(errors.New("missing auth config block"))
	}
	if len(u.Server) == 0 {
		err = multierror.Append(errors.New("missing server config block"))
	}
	if len(u.AWS) == 0 {
		// AWS config is optional
		u.AWS = append(u.AWS, AWS{})
	}
	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")
	}
}

// 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 := 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],
	}, nil
}