feat: add vercel serverless backend deployment setup

Author: CodeByPinar

.gitignore

@@ -20,3 +20,4 @@ frontend/dist/
 Thumbs.db
 .vscode/
 .idea/
+.vercel

api/index.go

@@ -0,0 +1,40 @@
+package handler
+
+import (
+  "context"
+  "encoding/json"
+  "net/http"
+  "sync"
+
+  "eventra/bootstrap"
+)
+
+var (
+  initOnce sync.Once
+  initErr  error
+  router   http.Handler
+)
+
+func Handler(w http.ResponseWriter, r *http.Request) {
+  if r.URL.Path == "/health" {
+    w.Header().Set("Content-Type", "application/json")
+    w.WriteHeader(http.StatusOK)
+    _ = json.NewEncoder(w).Encode(map[string]string{"status": "ok", "service": "eventra-auth"})
+    return
+  }
+
+  initOnce.Do(func() {
+    router, initErr = bootstrap.NewHTTPHandler(context.Background())
+  })
+
+  if initErr != nil {
+    w.Header().Set("Content-Type", "application/json")
+    w.WriteHeader(http.StatusInternalServerError)
+    _ = json.NewEncoder(w).Encode(map[string]string{
+      "error": "backend initialization failed",
+    })
+    return
+  }
+
+  router.ServeHTTP(w, r)
+}

bootstrap/http_handler.go

@@ -0,0 +1,47 @@
+package bootstrap
+
+import (
+  "context"
+  "fmt"
+  "net/http"
+
+  "eventra/internal/config"
+  "eventra/internal/delivery/httpserver"
+  "eventra/internal/repository/postgres"
+  "eventra/internal/usecase/auth"
+  "eventra/pkg/database"
+  "eventra/pkg/security"
+)
+
+func NewHTTPHandler(ctx context.Context) (http.Handler, error) {
+  cfg, err := config.Load()
+  if err != nil {
+    return nil, fmt.Errorf("load config: %w", err)
+  }
+
+  dbPool, err := database.NewPostgresPool(ctx, cfg.DBURL)
+  if err != nil {
+    return nil, fmt.Errorf("connect database: %w", err)
+  }
+
+  jwtManager := security.NewJWTManager(cfg.JWTSecret, cfg.JWTExpiration)
+  userRepo := postgres.NewUserRepository(dbPool)
+  refreshRepo := postgres.NewRefreshTokenRepository(dbPool)
+  securityRepo := postgres.NewLoginSecurityRepository(dbPool)
+  auditRepo := postgres.NewSecurityAuditRepository(dbPool, cfg.SecurityAlertWebhookURL, cfg.SecurityAlertWebhookFormat)
+  tokenBlacklistRepo := postgres.NewTokenBlacklistRepository(dbPool)
+
+  authService := auth.NewService(
+    userRepo,
+    refreshRepo,
+    jwtManager,
+    cfg.RefreshTokenExpiration,
+    auth.WithLoginSecurityRepository(securityRepo),
+    auth.WithAuditLogger(auditRepo),
+    auth.WithTokenBlacklist(tokenBlacklistRepo),
+  )
+
+  authHandler := httpserver.NewAuthHandler(authService)
+  router := httpserver.NewRouter(authHandler, jwtManager, tokenBlacklistRepo, cfg.CORSAllowedOrigins)
+  return router, nil
+}

vercel.json

@@ -0,0 +1,17 @@
+{
+  "functions": {
+    "api/index.go": {
+      "maxDuration": 15
+    }
+  },
+  "routes": [
+    {
+      "src": "/health",
+      "dest": "api/index.go"
+    },
+    {
+      "src": "/api/(.*)",
+      "dest": "api/index.go"
+    }
+  ]
+}