add env var checks

cmd/systemdesigngame/main.go

@@ -2,19 +2,22 @@ package main
 
 import (
 	"flag"
-	"github.com/joho/godotenv"
+	"fmt"
 	"html/template"
 	"net/http"
 	"os"
 	"systemdesigngame/internal/auth"
 	"systemdesigngame/internal/server"
 	"systemdesigngame/router"
+
+	"github.com/joho/godotenv"
 )
 
 func main() {
 	devMode := flag.Bool("dev", false, "load .env (local dev)")
 	flag.Parse()
 
+	fmt.Printf("devmode: %v", *devMode)
 	if *devMode {
 		if err := godotenv.Load(); err != nil {
 			panic("failed to load .env")
@@ -24,6 +27,11 @@ func main() {
 
 	// set up JWT secret used for authentication
 	auth.JwtSecret = []byte(os.Getenv("JWT_SECRET"))
+
+	if len(auth.JwtSecret) == 0 {
+		panic("JWT_SECRET is not set")
+	}
+
 	tmpl := template.Must(template.ParseGlob("static/*.html"))
 
 	server.InitApp()

internal/auth/auth.go

@@ -38,6 +38,15 @@ func LoginHandler(w http.ResponseWriter, r *http.Request) {
 
 	clientId := os.Getenv("GITHUB_CLIENT_ID")
 	redirectURI := os.Getenv("GITHUB_CALLBACK")
+
+	if os.Getenv("GITHUB_CLIENT_ID") == "" {
+		panic("GITHUB_CLIENT_ID is not set")
+	}
+
+	if os.Getenv("GITHUB_CALLBACK") == "" {
+		panic("GITHUB_CALLBACK is not set")
+	}
+
 	scope := "read:user user:email"
 	url := fmt.Sprintf(
 		"https://github.com/login/oauth/authorize?client_id=%s&redirect_uri=%s&scope=%s",

internal/server/server.go

@@ -10,15 +10,9 @@ import (
 	"systemdesigngame/internal/auth"
 	"systemdesigngame/internal/level"
 	"time"
-
-	"github.com/joho/godotenv"
 )
 
 func InitApp() {
-	if err := godotenv.Load(); err != nil {
-		log.Fatal("failed to load .env")
-	}
-
 	auth.JwtSecret = []byte(os.Getenv("JWT_SECRET"))
 
 	levels, err := level.LoadLevels("data/levels.json")