initial commit from original sev version

internal/config/config.go

@@ -0,0 +1,99 @@
+package config
+
+import (
+	"os"
+	"strconv"
+	"strings"
+	"time"
+)
+
+const (
+	DefaultPort          = ":8080"
+	DefaultJWTSecret     = "local-poc-secret-change-me"
+	DefaultResetInterval = 10 * time.Minute
+	DefaultDatasetSize   = 546
+)
+
+// ApiKey mirrors the original API's JWT utility style: utils.GenerateToken and
+// utils.VerifyToken read the signing secret from config.
+var ApiKey = DefaultJWTSecret
+
+type Config struct {
+	Environment string
+	API         APIConfig
+	Auth        AuthConfig
+	Dataset     DatasetConfig
+}
+
+type APIConfig struct {
+	Name    string
+	Port    string
+	BaseURL string
+}
+
+type AuthConfig struct {
+	JWTSecret string
+}
+
+type DatasetConfig struct {
+	Size          int
+	ResetInterval time.Duration
+}
+
+func LoadConfig() Config {
+	return Config{
+		Environment: envString("APP_ENV", "dev"),
+		API: APIConfig{
+			Name:    envString("APP_NAME", "abuse-registration-poc"),
+			Port:    envString("PORT", DefaultPort),
+			BaseURL: envString("BASE_URL", "http://localhost:8080"),
+		},
+		Auth: AuthConfig{
+			JWTSecret: envString("JWT_SECRET", DefaultJWTSecret),
+		},
+		Dataset: DatasetConfig{
+			Size:          envInt("DATASET_SIZE", DefaultDatasetSize),
+			ResetInterval: envDuration("RESET_INTERVAL", DefaultResetInterval),
+		},
+	}
+}
+
+func SetAPIKey(value string) {
+	if strings.TrimSpace(value) == "" {
+		ApiKey = DefaultJWTSecret
+		return
+	}
+	ApiKey = value
+}
+
+func envString(key, fallback string) string {
+	value := strings.TrimSpace(os.Getenv(key))
+	if value == "" {
+		return fallback
+	}
+	return value
+}
+
+func envInt(key string, fallback int) int {
+	value := strings.TrimSpace(os.Getenv(key))
+	if value == "" {
+		return fallback
+	}
+	parsed, err := strconv.Atoi(value)
+	if err != nil || parsed < 1 {
+		return fallback
+	}
+	return parsed
+}
+
+func envDuration(key string, fallback time.Duration) time.Duration {
+	value := strings.TrimSpace(os.Getenv(key))
+	if value == "" {
+		return fallback
+	}
+	parsed, err := time.ParseDuration(value)
+	if err != nil {
+		return fallback
+	}
+	return parsed
+}