init gateway-service

services/gateway-service/internal/config.go

@@ -0,0 +1,50 @@
+package internal
+
+import (
+	"os"
+	"crypto/rsa"
+	"encoding/base64"
+
+	"github.com/golang-jwt/jwt/v5"
+	"github.com/gofiber/fiber/v2/log"
+)
+
+func NewConfig() Config {
+	pubKeyBytes, err := base64.StdEncoding.DecodeString(optFromEnvRequire("JWT_PUBLIC_KEY"))
+	if err != nil {
+		log.Fatal("jwt public key not in base64 format")
+	}
+
+	jwtPubKey, err := jwt.ParseRSAPublicKeyFromPEM(pubKeyBytes)
+	if err != nil {
+		log.Panic("invalid jwt public key provided (must be RSA)")
+	}
+
+	return Config{
+		PanelSvcAddr: optFromEnvRequire("PANEL_SVC_ADDR"),
+		PostSvcAddr: optFromEnvRequire("POST_SVC_ADDR"),
+		UserSvcAddr: optFromEnvRequire("USER_SVC_ADDR"),
+		AuthSvcAddr: optFromEnvRequire("AUTH_SVC_ADDR"),
+		CommentSvcAddr: optFromEnvRequire("COMMENT_SVC_ADDR"),
+
+		JWTPubKey: jwtPubKey,
+	}
+}
+
+func optFromEnvRequire(opt string) string {
+	optValue, exists := os.LookupEnv(opt)
+	if !exists || optValue == "" {
+		log.Fatalf("failed to load required config option ('%s')", opt)
+	}
+	return optValue
+}
+
+type Config struct {
+	PostSvcAddr string
+	PanelSvcAddr string
+	UserSvcAddr string
+	AuthSvcAddr string
+	CommentSvcAddr string
+
+	JWTPubKey *rsa.PublicKey
+}