Add full monorepo: virtual-banker, backend, frontend, docs, scripts, deployment

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/api/middleware/security.go

@@ -0,0 +1,63 @@
+package middleware
+
+import (
+	"net/http"
+	"strings"
+)
+
+// SecurityMiddleware adds security headers
+type SecurityMiddleware struct{}
+
+// NewSecurityMiddleware creates a new security middleware
+func NewSecurityMiddleware() *SecurityMiddleware {
+	return &SecurityMiddleware{}
+}
+
+// AddSecurityHeaders adds security headers to responses
+func (m *SecurityMiddleware) AddSecurityHeaders(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// Content Security Policy
+		// unsafe-eval required by ethers.js v5 UMD from CDN (ABI decoding)
+		w.Header().Set("Content-Security-Policy", "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://cdn.jsdelivr.net https://unpkg.com https://cdnjs.cloudflare.com; style-src 'self' 'unsafe-inline' https://cdnjs.cloudflare.com; font-src 'self' https://cdnjs.cloudflare.com; img-src 'self' data: https:; connect-src 'self' https://explorer.d-bis.org https://rpc-http-pub.d-bis.org wss://rpc-ws-pub.d-bis.org http://192.168.11.221:8545 ws://192.168.11.221:8546;")
+
+		// X-Frame-Options (click-jacking protection)
+		w.Header().Set("X-Frame-Options", "DENY")
+
+		// X-Content-Type-Options
+		w.Header().Set("X-Content-Type-Options", "nosniff")
+
+		// X-XSS-Protection
+		w.Header().Set("X-XSS-Protection", "1; mode=block")
+
+		// Strict-Transport-Security
+		w.Header().Set("Strict-Transport-Security", "max-age=31536000; includeSubDomains")
+
+		// Referrer-Policy
+		w.Header().Set("Referrer-Policy", "strict-origin-when-cross-origin")
+
+		// Permissions-Policy
+		w.Header().Set("Permissions-Policy", "geolocation=(), microphone=(), camera=()")
+
+		next.ServeHTTP(w, r)
+	})
+}
+
+// BlockWriteCalls blocks contract write calls except WETH operations
+func (m *SecurityMiddleware) BlockWriteCalls(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// Only apply to POST requests (write operations)
+		if r.Method == http.MethodPost {
+			// Check if this is a WETH operation (allowed)
+			path := r.URL.Path
+			if !strings.Contains(path, "weth") && !strings.Contains(path, "wrap") && !strings.Contains(path, "unwrap") {
+				// Block other write operations for Track 1
+				if strings.HasPrefix(path, "/api/v1/track1") {
+					http.Error(w, "Write operations not allowed for Track 1 (public)", http.StatusForbidden)
+					return
+				}
+			}
+		}
+
+		next.ServeHTTP(w, r)
+	})
+}