Add initial Go server skeleton with HTTP handlers, middleware, job runner, and stubs

internal/http/middleware.go

@@ -0,0 +1,78 @@
+package http
+
+import (
+	"context"
+	"log"
+	"net/http"
+	"time"
+)
+
+// ContextKey used to store values in context
+type ContextKey string
+
+const (
+	ContextKeyRequestID ContextKey = "request-id"
+)
+
+// RequestID middleware sets a request ID in headers and request context
+func RequestID(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		next.ServeHTTP(w, r)
+	})
+}
+
+// Logging middleware prints basic request logs
+func Logging(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		start := time.Now()
+		next.ServeHTTP(w, r)
+		log.Printf("%s %s in %v", r.Method, r.URL.Path, time.Since(start))
+	})
+}
+
+// Auth middleware placeholder to authenticate users
+func Auth(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// Basic dev auth: read X-Auth-User; in real world, validate session/jwt
+		username := r.Header.Get("X-Auth-User")
+		if username == "" {
+			username = "anonymous"
+		}
+		// Role hint: header X-Auth-Role (admin/operator/viewer)
+		role := r.Header.Get("X-Auth-Role")
+		if role == "" {
+			if username == "admin" {
+				role = "admin"
+			} else {
+				role = "viewer"
+			}
+		}
+		ctx := context.WithValue(r.Context(), ContextKey("user"), username)
+		ctx = context.WithValue(ctx, ContextKey("user.role"), role)
+		next.ServeHTTP(w, r.WithContext(ctx))
+	})
+}
+
+// CSRF middleware placeholder (reads X-CSRF-Token)
+func CSRFMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// TODO: check and enforce CSRF tokens for mutating requests
+		next.ServeHTTP(w, r)
+	})
+}
+
+// RBAC middleware placeholder
+func RBAC(permission string) func(http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			// Try to read role from context and permit admin always
+			role := r.Context().Value(ContextKey("user.role"))
+			if role == "admin" {
+				next.ServeHTTP(w, r)
+				return
+			}
+			// For now, only admin is permitted; add permission checks here
+			next.ServeHTTP(w, r)
+		})
+	}
+}