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package config
import (
"fmt"
"net"
"net/mail"
"os"
"strconv"
"strings"
"time"
)
type Config struct {
Listen string
PublicBaseURL string
SMTP SMTPConfig
Nym NymConfig
Security SecurityConfig
}
type SMTPConfig struct {
Host string
Port int
Recipient string
EnvelopeFrom string
Sender string
Username string
Password string
PasswordFile string
HELO string
TLSServerName string
RequireTLS bool
ImplicitTLS bool
Timeout time.Duration
ProbeInterval time.Duration
DryRun bool
}
type NymConfig struct {
Enabled bool
Managed bool
Binary string
Provider string
HomeDir string
ClientID string
SocksAddr string
AnonymousReplies bool
StartupTimeout time.Duration
}
type SecurityConfig struct {
MinHashcashBits int
MinMessageBytes int
MaxMessageBytes int
MaxNewsgroups int
RateLimitCount int
RateLimitWindow time.Duration
TrustProxy bool
SecureCookies bool
MessageIDDomain string
IdenticonsCLI string
RequireFace bool
CSRFKeyFile string
CSRFKey []byte
}
func Load() (Config, error) {
cfg := Config{
Listen: env("N2U_LISTEN", "M2U_LISTEN", "127.0.0.1:8095"),
PublicBaseURL: env("N2U_PUBLIC_BASE_URL", "M2U_PUBLIC_BASE_URL", "https://n2usenet.virebent.art"),
SMTP: SMTPConfig{
Host: env("N2U_SMTP_HOST", "M2U_SMTP_HOST", "mail2news.tcpreset.net"),
Port: envInt("N2U_SMTP_PORT", "M2U_SMTP_PORT", 25),
Recipient: env("N2U_SMTP_RECIPIENT", "M2U_SMTP_RECIPIENT", "mail2news@mail2news.tcpreset.net"),
EnvelopeFrom: env("N2U_SMTP_ENVELOPE_FROM", "M2U_SMTP_ENVELOPE_FROM", "n2usenet@virebent.art"),
Sender: envAny("n2usenet@virebent.art", "N2U_SMTP_SENDER", "M2U_SMTP_SENDER", "N2U_SMTP_HEADER_FROM", "M2U_SMTP_HEADER_FROM"),
Username: env("N2U_SMTP_USERNAME", "M2U_SMTP_USERNAME", ""),
PasswordFile: env("N2U_SMTP_PASSWORD_FILE", "M2U_SMTP_PASSWORD_FILE", ""),
HELO: env("N2U_SMTP_HELO", "M2U_SMTP_HELO", "n2usenet.virebent.art"),
TLSServerName: env("N2U_SMTP_TLS_SERVER_NAME", "M2U_SMTP_TLS_SERVER_NAME", "mail.tcpreset.net"),
RequireTLS: envBool("N2U_SMTP_REQUIRE_TLS", "M2U_SMTP_REQUIRE_TLS", true),
ImplicitTLS: envBool("N2U_SMTP_IMPLICIT_TLS", "M2U_SMTP_IMPLICIT_TLS", false),
Timeout: envDuration("N2U_SMTP_TIMEOUT", "M2U_SMTP_TIMEOUT", 90*time.Second),
ProbeInterval: envDuration("N2U_TRANSPORT_PROBE_INTERVAL", "M2U_TRANSPORT_PROBE_INTERVAL", 15*time.Minute),
DryRun: envBool("N2U_DRY_RUN", "M2U_DRY_RUN", false),
},
Nym: NymConfig{
Enabled: envBool("N2U_NYM_ENABLED", "M2U_NYM_ENABLED", true),
Managed: envBool("N2U_NYM_MANAGED", "M2U_NYM_MANAGED", false),
Binary: env("N2U_NYM_BINARY", "M2U_NYM_BINARY", "nym-socks5-client"),
Provider: env("N2U_NYM_PROVIDER", "M2U_NYM_PROVIDER", ""),
HomeDir: env("N2U_NYM_HOME", "M2U_NYM_HOME", "./data/nym"),
ClientID: env("N2U_NYM_CLIENT_ID", "M2U_NYM_CLIENT_ID", "n2usenet"),
SocksAddr: env("N2U_NYM_SOCKS", "M2U_NYM_SOCKS", "127.0.0.1:11080"),
AnonymousReplies: envBool("N2U_NYM_ANONYMOUS_REPLIES", "M2U_NYM_ANONYMOUS_REPLIES", true),
StartupTimeout: envDuration("N2U_NYM_STARTUP_TIMEOUT", "M2U_NYM_STARTUP_TIMEOUT", 120*time.Second),
},
Security: SecurityConfig{
MinHashcashBits: envInt("N2U_HASHCASH_MIN_BITS", "M2U_HASHCASH_MIN_BITS", 20),
MinMessageBytes: envInt("N2U_MIN_MESSAGE_BYTES", "M2U_MIN_MESSAGE_BYTES", 10),
MaxMessageBytes: envInt("N2U_MAX_MESSAGE_BYTES", "M2U_MAX_MESSAGE_BYTES", 65536),
MaxNewsgroups: envInt("N2U_MAX_NEWSGROUPS", "M2U_MAX_NEWSGROUPS", 3),
RateLimitCount: envInt("N2U_RATE_LIMIT_COUNT", "M2U_RATE_LIMIT_COUNT", 10),
RateLimitWindow: envDuration("N2U_RATE_LIMIT_WINDOW", "M2U_RATE_LIMIT_WINDOW", time.Hour),
TrustProxy: envBool("N2U_TRUST_PROXY", "M2U_TRUST_PROXY", true),
SecureCookies: envBool("N2U_SECURE_COOKIES", "M2U_SECURE_COOKIES", true),
MessageIDDomain: env("N2U_MESSAGE_ID_DOMAIN", "M2U_MESSAGE_ID_DOMAIN", "n2usenet.virebent.art"),
IdenticonsCLI: env("N2U_IDENTICONS_CLI", "M2U_IDENTICONS_CLI", "/usr/local/bin/identicons-cli"),
RequireFace: envBool("N2U_REQUIRE_FACE", "M2U_REQUIRE_FACE", true),
CSRFKeyFile: env("N2U_CSRF_KEY_FILE", "M2U_CSRF_KEY_FILE", ""),
},
}
if cfg.SMTP.PasswordFile != "" {
password, err := readSecretFile(cfg.SMTP.PasswordFile)
if err != nil {
return Config{}, fmt.Errorf("read SMTP password file: %w", err)
}
cfg.SMTP.Password = password
}
if cfg.Security.CSRFKeyFile != "" {
key, err := readSecretFile(cfg.Security.CSRFKeyFile)
if err != nil {
return Config{}, fmt.Errorf("read CSRF key file: %w", err)
}
cfg.Security.CSRFKey = []byte(key)
}
if err := cfg.Validate(); err != nil {
return Config{}, err
}
return cfg, nil
}
func (c Config) Validate() error {
if _, _, err := net.SplitHostPort(c.Listen); err != nil {
return fmt.Errorf("invalid N2U_LISTEN: %w", err)
}
if c.SMTP.Host == "" {
return fmt.Errorf("N2U_SMTP_HOST is required")
}
if c.SMTP.Port < 1 || c.SMTP.Port > 65535 {
return fmt.Errorf("invalid N2U_SMTP_PORT")
}
if c.SMTP.Recipient == "" {
return fmt.Errorf("N2U_SMTP_RECIPIENT is required")
}
if c.SMTP.EnvelopeFrom == "" {
return fmt.Errorf("N2U_SMTP_ENVELOPE_FROM is required")
}
sender, err := mail.ParseAddress(c.SMTP.Sender)
if err != nil || sender.Address == "" {
return fmt.Errorf("N2U_SMTP_SENDER must be a valid email address")
}
if (c.SMTP.Username == "") != (c.SMTP.Password == "") {
return fmt.Errorf("N2U_SMTP_USERNAME and N2U_SMTP_PASSWORD_FILE must be configured together")
}
if c.SMTP.Username != "" && !c.SMTP.RequireTLS && !c.SMTP.ImplicitTLS {
return fmt.Errorf("SMTP authentication requires TLS")
}
if c.SMTP.RequireTLS && c.SMTP.TLSServerName == "" {
return fmt.Errorf("N2U_SMTP_TLS_SERVER_NAME is required when TLS is required")
}
if c.SMTP.ProbeInterval < time.Minute {
return fmt.Errorf("N2U_TRANSPORT_PROBE_INTERVAL must be at least 1m")
}
if c.Nym.Enabled {
if _, _, err := net.SplitHostPort(c.Nym.SocksAddr); err != nil {
return fmt.Errorf("invalid N2U_NYM_SOCKS: %w", err)
}
if c.Nym.Managed && c.Nym.Provider == "" {
return fmt.Errorf("N2U_NYM_PROVIDER is required when N2U_NYM_MANAGED=true")
}
}
if c.Security.MinHashcashBits < 1 || c.Security.MinHashcashBits > 32 {
return fmt.Errorf("invalid N2U_HASHCASH_MIN_BITS")
}
if c.Security.MinMessageBytes < 0 || c.Security.MaxMessageBytes <= c.Security.MinMessageBytes {
return fmt.Errorf("invalid message size limits")
}
if c.Security.MaxNewsgroups < 1 || c.Security.MaxNewsgroups > 10 {
return fmt.Errorf("invalid N2U_MAX_NEWSGROUPS")
}
if c.Security.RateLimitCount < 1 {
return fmt.Errorf("invalid N2U_RATE_LIMIT_COUNT")
}
if c.Security.RequireFace && c.Security.IdenticonsCLI == "" {
return fmt.Errorf("N2U_IDENTICONS_CLI is required when N2U_REQUIRE_FACE=true")
}
if c.Security.CSRFKeyFile != "" && len(c.Security.CSRFKey) < 32 {
return fmt.Errorf("N2U_CSRF_KEY_FILE must contain at least 32 bytes")
}
return nil
}
func env(primary, legacy, fallback string) string {
v, ok := envValue(primary, legacy)
if !ok {
return fallback
}
return v
}
func envAny(fallback string, keys ...string) string {
for _, key := range keys {
if value := strings.TrimSpace(os.Getenv(key)); value != "" {
return value
}
}
return fallback
}
func envBool(primary, legacy string, fallback bool) bool {
v, ok := envValue(primary, legacy)
if !ok {
return fallback
}
switch strings.ToLower(v) {
case "1", "true", "yes", "on":
return true
case "0", "false", "no", "off":
return false
default:
return fallback
}
}
func envInt(primary, legacy string, fallback int) int {
v, ok := envValue(primary, legacy)
if !ok {
return fallback
}
n, err := strconv.Atoi(v)
if err != nil {
return fallback
}
return n
}
func envDuration(primary, legacy string, fallback time.Duration) time.Duration {
v, ok := envValue(primary, legacy)
if !ok {
return fallback
}
if d, err := time.ParseDuration(v); err == nil {
return d
}
if n, err := strconv.Atoi(v); err == nil {
return time.Duration(n) * time.Second
}
return fallback
}
func envValue(primary, legacy string) (string, bool) {
for _, key := range []string{primary, legacy} {
v := strings.TrimSpace(os.Getenv(key))
if v != "" {
return v, true
}
}
return "", false
}
func readSecretFile(path string) (string, error) {
raw, err := os.ReadFile(path)
if err != nil {
return "", err
}
value := strings.TrimSpace(string(raw))
if value == "" {
return "", fmt.Errorf("file is empty")
}
return value, nil
}
|
