Initial commit

2026-07-12 15:53:24 +08:00
commit 68d61700d5
252 changed files with 23291 additions and 0 deletions
--- a/server/internal/config/config.go
+++ b/server/internal/config/config.go
@@ -0,0 +1,191 @@
+package config
+
+import (
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"net/url"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+)
+
+type Config struct {
+	Environment          string
+	HTTPAddr             string
+	DatabaseURL          string
+	EncryptionKey        []byte
+	PhoneHMACKey         []byte
+	SessionCookieName    string
+	SessionSecure        bool
+	SessionTTL           time.Duration
+	MigrateOnStart       bool
+	ShutdownTimeout      time.Duration
+	DBMaxOpenConns       int
+	DBMaxIdleConns       int
+	DBConnMaxIdleTime    time.Duration
+	DBConnMaxLifetime    time.Duration
+	MaintenanceInterval  time.Duration
+	MaintenanceBatchSize int
+}
+
+func Load() (Config, error) {
+	return load(os.LookupEnv)
+}
+
+func load(lookup func(string) (string, bool)) (Config, error) {
+	get := func(name, fallback string) string {
+		if value, ok := lookup(name); ok {
+			return strings.TrimSpace(value)
+		}
+		return fallback
+	}
+
+	encryptionKey, err := decodeKey("DATA_ENCRYPTION_KEY_BASE64", get("DATA_ENCRYPTION_KEY_BASE64", ""))
+	if err != nil {
+		return Config{}, err
+	}
+	phoneHMACKey, err := decodeKey("PHONE_HMAC_KEY_BASE64", get("PHONE_HMAC_KEY_BASE64", ""))
+	if err != nil {
+		return Config{}, err
+	}
+
+	sessionTTL, err := time.ParseDuration(get("SESSION_TTL", "12h"))
+	if err != nil || sessionTTL < 15*time.Minute || sessionTTL > 7*24*time.Hour {
+		return Config{}, errors.New("SESSION_TTL must be a duration between 15m and 168h")
+	}
+	shutdownTimeout, err := time.ParseDuration(get("SHUTDOWN_TIMEOUT", "10s"))
+	if err != nil || shutdownTimeout < time.Second || shutdownTimeout > time.Minute {
+		return Config{}, errors.New("SHUTDOWN_TIMEOUT must be a duration between 1s and 1m")
+	}
+	sessionSecure, err := strconv.ParseBool(get("SESSION_COOKIE_SECURE", "true"))
+	if err != nil {
+		return Config{}, fmt.Errorf("SESSION_COOKIE_SECURE: %w", err)
+	}
+	migrate, err := strconv.ParseBool(get("MIGRATE_ON_START", "true"))
+	if err != nil {
+		return Config{}, fmt.Errorf("MIGRATE_ON_START: %w", err)
+	}
+
+	environment := get("APP_ENV", "development")
+	databaseURL := get("DATABASE_URL", "")
+	if databaseURL == "" {
+		return Config{}, errors.New("DATABASE_URL is required")
+	}
+	maxOpen, err := parseIntSetting("DB_MAX_OPEN_CONNS", get("DB_MAX_OPEN_CONNS", "20"), 1, 1000)
+	if err != nil {
+		return Config{}, err
+	}
+	maxIdle, err := parseIntSetting("DB_MAX_IDLE_CONNS", get("DB_MAX_IDLE_CONNS", "5"), 0, 1000)
+	if err != nil {
+		return Config{}, err
+	}
+	if maxIdle > maxOpen {
+		return Config{}, errors.New("DB_MAX_IDLE_CONNS cannot exceed DB_MAX_OPEN_CONNS")
+	}
+	connMaxIdleTime, err := parseDurationSetting("DB_CONN_MAX_IDLE_TIME", get("DB_CONN_MAX_IDLE_TIME", "5m"), time.Minute, 24*time.Hour)
+	if err != nil {
+		return Config{}, err
+	}
+	connMaxLifetime, err := parseDurationSetting("DB_CONN_MAX_LIFETIME", get("DB_CONN_MAX_LIFETIME", "30m"), time.Minute, 7*24*time.Hour)
+	if err != nil {
+		return Config{}, err
+	}
+	maintenanceInterval, err := parseDurationSetting("MAINTENANCE_INTERVAL", get("MAINTENANCE_INTERVAL", "1h"), 0, 24*time.Hour)
+	if err != nil {
+		return Config{}, err
+	}
+	maintenanceBatchSize, err := parseIntSetting("MAINTENANCE_BATCH_SIZE", get("MAINTENANCE_BATCH_SIZE", "500"), 1, 10000)
+	if err != nil {
+		return Config{}, err
+	}
+	if environment == "production" && !sessionSecure {
+		return Config{}, errors.New("SESSION_COOKIE_SECURE must be true in production")
+	}
+	if environment == "production" && migrate {
+		return Config{}, errors.New("MIGRATE_ON_START must be false in production; run migrations as a release job")
+	}
+	if environment == "production" && !postgresTLSConfigured(databaseURL) {
+		return Config{}, errors.New("DATABASE_URL must use PostgreSQL TLS in production")
+	}
+	if environment == "production" && maintenanceInterval <= 0 {
+		return Config{}, errors.New("MAINTENANCE_INTERVAL must be positive in production")
+	}
+
+	cookieName := get("SESSION_COOKIE_NAME", "queue_session")
+	if cookieName == "" || strings.ContainsAny(cookieName, "()<>@,;:\\\"/[]?={} \t") {
+		return Config{}, errors.New("SESSION_COOKIE_NAME is not a valid cookie name")
+	}
+
+	return Config{
+		Environment:          environment,
+		HTTPAddr:             get("HTTP_ADDR", ":8080"),
+		DatabaseURL:          databaseURL,
+		EncryptionKey:        encryptionKey,
+		PhoneHMACKey:         phoneHMACKey,
+		SessionCookieName:    cookieName,
+		SessionSecure:        sessionSecure,
+		SessionTTL:           sessionTTL,
+		MigrateOnStart:       migrate,
+		ShutdownTimeout:      shutdownTimeout,
+		DBMaxOpenConns:       maxOpen,
+		DBMaxIdleConns:       maxIdle,
+		DBConnMaxIdleTime:    connMaxIdleTime,
+		DBConnMaxLifetime:    connMaxLifetime,
+		MaintenanceInterval:  maintenanceInterval,
+		MaintenanceBatchSize: maintenanceBatchSize,
+	}, nil
+}
+
+func parseIntSetting(name, value string, min, max int) (int, error) {
+	parsed, err := strconv.Atoi(strings.TrimSpace(value))
+	if err != nil || parsed < min || parsed > max {
+		return 0, fmt.Errorf("%s must be an integer between %d and %d", name, min, max)
+	}
+	return parsed, nil
+}
+
+func parseDurationSetting(name, value string, min, max time.Duration) (time.Duration, error) {
+	parsed, err := time.ParseDuration(strings.TrimSpace(value))
+	if err != nil || parsed < min || parsed > max {
+		return 0, fmt.Errorf("%s must be a duration between %s and %s", name, min, max)
+	}
+	return parsed, nil
+}
+
+func postgresTLSConfigured(dsn string) bool {
+	value := strings.TrimSpace(dsn)
+	if parsed, err := url.Parse(value); err == nil && (parsed.Scheme == "postgres" || parsed.Scheme == "postgresql") {
+		return secureSSLMode(parsed.Query().Get("sslmode"))
+	}
+	for _, field := range strings.Fields(value) {
+		if strings.HasPrefix(field, "sslmode=") {
+			return secureSSLMode(strings.TrimPrefix(field, "sslmode="))
+		}
+	}
+	return false
+}
+
+func secureSSLMode(mode string) bool {
+	switch strings.ToLower(strings.TrimSpace(mode)) {
+	case "require", "verify-ca", "verify-full":
+		return true
+	default:
+		return false
+	}
+}
+
+func decodeKey(name, value string) ([]byte, error) {
+	if value == "" {
+		return nil, fmt.Errorf("%s is required", name)
+	}
+	decoded, err := base64.StdEncoding.DecodeString(value)
+	if err != nil {
+		return nil, fmt.Errorf("%s must be standard base64: %w", name, err)
+	}
+	if len(decoded) != 32 {
+		return nil, fmt.Errorf("%s must decode to exactly 32 bytes", name)
+	}
+	return decoded, nil
+}