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package internal
import (
"fmt"
"os"
"strconv"
"strings"
)
// Default configuration values.
const (
DefaultPort = 8080
DefaultMediaRoot = "./media"
DefaultDBPath = "data.db"
// DefaultMaxUploadSizeMB is 10 GB, chosen to accommodate large video files
// without imposing an arbitrary low cap. Operators can lower it via the
// MAX_UPLOAD_SIZE_MB environment variable for tighter constraints.
DefaultMaxUploadSizeMB = 10240
DefaultSessionTimeoutHours = 24
DefaultGCIntervalMinutes = 30
DefaultShareDefaultExpiryDays = 7
DefaultPodcastCheckMinutes = 60
DefaultMediaPageSize = 100
DefaultLogLevel = "info"
DefaultSecureCookies = true
)
// Config holds all application configuration loaded from environment variables.
type Config struct {
Port int
MediaRoot string
DBPath string
MaxUploadSizeMB int
SessionTimeoutHours int
GCIntervalMinutes int
ShareDefaultExpiryDays int
PodcastCheckMinutes int
MediaPageSize int
LogLevel string
SecureCookies bool
CORSAllowedOrigins []string
}
// envInt reads an integer environment variable, validates it with the given check,
// and sets the field via the provided setter. If the variable is unset, the setter
// is not called and the default remains.
func envInt(name string, check func(int) error, set func(int)) error {
if v := os.Getenv(name); v != "" {
n, err := strconv.Atoi(v)
if err != nil {
return fmt.Errorf("invalid %s: %w", name, err)
}
if err := check(n); err != nil {
return fmt.Errorf("invalid %s: %w", name, err)
}
set(n)
}
return nil
}
// envString reads a string environment variable, trims space, and sets the field
// via the provided setter if the variable is non-empty.
func envString(name string, set func(string)) {
if v := os.Getenv(name); v != "" {
set(strings.TrimSpace(v))
}
}
// validLogLevels contains the acceptable values for LOG_LEVEL.
var validLogLevels = map[string]struct{}{
"debug": {},
"info": {},
"warn": {},
"error": {},
}
// defaultConfig returns a Config populated with package-level defaults.
func defaultConfig() *Config {
return &Config{
Port: DefaultPort,
MediaRoot: DefaultMediaRoot,
DBPath: DefaultDBPath,
MaxUploadSizeMB: DefaultMaxUploadSizeMB,
SessionTimeoutHours: DefaultSessionTimeoutHours,
GCIntervalMinutes: DefaultGCIntervalMinutes,
ShareDefaultExpiryDays: DefaultShareDefaultExpiryDays,
PodcastCheckMinutes: DefaultPodcastCheckMinutes,
MediaPageSize: DefaultMediaPageSize,
LogLevel: DefaultLogLevel,
SecureCookies: DefaultSecureCookies,
}
}
// loadNumericSettings reads numeric settings from the environment.
func loadNumericSettings(cfg *Config) error {
if err := envInt("PORT", func(n int) error {
// Allow 0 so tests can bind to an ephemeral port.
if n < 0 || n > 65535 {
return fmt.Errorf("must be between 0 and 65535, got %d", n)
}
return nil
}, func(n int) { cfg.Port = n }); err != nil {
return err
}
if err := envInt("MAX_UPLOAD_SIZE_MB", func(n int) error {
if n < 1 {
return fmt.Errorf("must be >= 1, got %d", n)
}
return nil
}, func(n int) { cfg.MaxUploadSizeMB = n }); err != nil {
return err
}
if err := envInt("SESSION_TIMEOUT_HOURS", func(n int) error {
if n < 1 {
return fmt.Errorf("must be >= 1, got %d", n)
}
return nil
}, func(n int) { cfg.SessionTimeoutHours = n }); err != nil {
return err
}
if err := envInt("GC_INTERVAL_MINUTES", func(n int) error {
if n < 1 {
return fmt.Errorf("must be >= 1, got %d", n)
}
return nil
}, func(n int) { cfg.GCIntervalMinutes = n }); err != nil {
return err
}
if err := envInt("SHARE_DEFAULT_EXPIRY_DAYS", func(n int) error {
if n < 1 {
return fmt.Errorf("must be >= 1, got %d", n)
}
return nil
}, func(n int) { cfg.ShareDefaultExpiryDays = n }); err != nil {
return err
}
if err := envInt("PODCAST_CHECK_INTERVAL_MINUTES", func(n int) error {
if n < 1 {
return fmt.Errorf("must be >= 1, got %d", n)
}
return nil
}, func(n int) { cfg.PodcastCheckMinutes = n }); err != nil {
return err
}
if err := envInt("MEDIA_PAGE_SIZE", func(n int) error {
if n < 1 {
return fmt.Errorf("must be >= 1, got %d", n)
}
return nil
}, func(n int) { cfg.MediaPageSize = n }); err != nil {
return err
}
return nil
}
// loadStringSettings reads MEDIA_ROOT and DB_PATH from the environment.
func loadStringSettings(cfg *Config) {
envString("MEDIA_ROOT", func(s string) { cfg.MediaRoot = s })
envString("DB_PATH", func(s string) { cfg.DBPath = s })
}
// loadLogLevel reads LOG_LEVEL from the environment and validates it.
func loadLogLevel(cfg *Config) error {
if v := os.Getenv("LOG_LEVEL"); v != "" {
level := strings.ToLower(strings.TrimSpace(v))
if _, ok := validLogLevels[level]; !ok {
return fmt.Errorf("invalid LOG_LEVEL: must be one of debug, info, warn, error, got %q", level)
}
cfg.LogLevel = level
}
return nil
}
// loadSecureCookies reads SECURE_COOKIES from the environment.
func loadSecureCookies(cfg *Config) error {
if v := os.Getenv("SECURE_COOKIES"); v != "" {
b, err := strconv.ParseBool(strings.TrimSpace(v))
if err != nil {
return fmt.Errorf("invalid SECURE_COOKIES: %w", err)
}
cfg.SecureCookies = b
}
return nil
}
// loadCORSSettings reads comma-separated CORS origins from the environment.
func loadCORSSettings(cfg *Config) {
if v := os.Getenv("PLAYER_CORS_ORIGINS"); v != "" {
for _, origin := range strings.Split(v, ",") {
origin = strings.TrimSpace(origin)
if origin != "" {
cfg.CORSAllowedOrigins = append(cfg.CORSAllowedOrigins, origin)
}
}
}
}
// LoadConfig reads configuration from environment variables and returns
// a populated Config. Unset variables use the package defaults.
func LoadConfig() (*Config, error) {
cfg := defaultConfig()
loadStringSettings(cfg)
loadCORSSettings(cfg)
if err := loadNumericSettings(cfg); err != nil {
return nil, err
}
if err := loadLogLevel(cfg); err != nil {
return nil, err
}
if err := loadSecureCookies(cfg); err != nil {
return nil, err
}
return cfg, nil
}
|
