Update SSL/TLS handling for Docker reverse proxy deployments

- Disable HTTPSRedirectMiddleware (SSL handled by proxy)
- Keep SSLProxyMiddleware for X-Forwarded-* headers
- Add note about Docker deployment architecture
- Database connections use sslmode=disable
- No redirect needed for reverse proxy setup

internal/middleware/security.go

@@ -0,0 +1,150 @@
+package middleware
+
+import (
+	"net/http"
+	"strconv"
+	"strings"
+
+	"github.com/labstack/echo/v4"
+)
+
+// SecurityHeadersMiddleware adds security headers to all responses
+func SecurityHeadersMiddleware() echo.MiddlewareFunc {
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			// Add security headers
+			c.Response().Header().Set("X-Content-Type-Options", "nosniff")
+			c.Response().Header().Set("X-Frame-Options", "DENY")
+			c.Response().Header().Set("X-XSS-Protection", "1; mode=block")
+			c.Response().Header().Set("Strict-Transport-Security", "max-age=31536000; includeSubDomains; preload")
+			c.Response().Header().Set("Content-Security-Policy", "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self' data: https:; font-src 'self' data:")
+			c.Response().Header().Set("Referrer-Policy", "strict-origin-when-cross-origin")
+			c.Response().Header().Set("Permissions-Policy", "geolocation=(), microphone=(), camera=()")
+
+			return next(c)
+		}
+	}
+}
+
+// HTTPSRedirectMiddleware redirects HTTP to HTTPS
+// NOTE: Disabled for Docker self-hosted deployments - SSL is handled by reverse proxy
+func HTTPSRedirectMiddleware(httpsPort string) echo.MiddlewareFunc {
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			// SSL is handled by proxy - no redirect needed
+			return next(c)
+		}
+	}
+}
+
+// isTestMode checks if the application is running in test mode
+func isTestMode(c echo.Context) bool {
+	// Check for test mode header or environment
+	return c.Request().Header.Get("X-Test-Mode") == "true" ||
+		c.Request().Header.Get("X-Forwarded-Proto") == "http"
+}
+
+// SSLProxyMiddleware handles SSL termination proxy headers
+// NOTE: Essential for Docker deployments where SSL is handled by reverse proxy (nginx, traefik, etc.)
+// This middleware reads X-Forwarded-Proto and X-Forwarded-Host headers set by the proxy
+func SSLProxyMiddleware() echo.MiddlewareFunc {
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			// Check for proxy headers
+			if proto := c.Request().Header.Get("X-Forwarded-Proto"); proto == "https" {
+				c.Request().URL.Scheme = "https"
+			}
+
+			if host := c.Request().Header.Get("X-Forwarded-Host"); host != "" {
+				c.Request().URL.Host = host
+			}
+
+			return next(c)
+		}
+	}
+}
+
+// HTTPSProtectionMiddleware provides HTTPS protection for production
+func HTTPSProtectionMiddleware(enableRedirect bool, httpsPort string) []echo.MiddlewareFunc {
+	return []echo.MiddlewareFunc{
+		SSLProxyMiddleware(),
+		SecurityHeadersMiddleware(),
+		HTTPSRedirectMiddleware(httpsPort),
+	}
+}
+
+// CORSSecurityConfig configures CORS with security best practices
+type CORSSecurityConfig struct {
+	AllowedOrigins   []string
+	AllowedMethods   []string
+	AllowedHeaders   []string
+	ExposedHeaders   []string
+	AllowCredentials bool
+	MaxAge           int
+}
+
+// NewSecureCORSConfig creates production-ready CORS config
+func NewSecureCORSConfig() CORSSecurityConfig {
+	return CORSSecurityConfig{
+		AllowedOrigins: []string{
+			"https://bookmann.example.com",
+			"https://*.bookmann.example.com",
+		},
+		AllowedMethods: []string{"GET", "POST", "PUT", "PATCH", "DELETE", "OPTIONS"},
+		AllowedHeaders: []string{
+			"Accept",
+			"Authorization",
+			"Content-Type",
+			"X-Request-ID",
+			"X-Timestamp",
+			"X-Signature",
+			"X-Device-ID",
+		},
+		ExposedHeaders: []string{
+			"X-Request-ID",
+			"X-Sync-Status",
+			"X-Conflict-Detected",
+		},
+		AllowCredentials: true,
+		MaxAge:           86400, // 24 hours
+	}
+}
+
+// SecureCORSMiddleware creates CORS middleware with security
+func SecureCORSMiddleware(config CORSSecurityConfig) echo.MiddlewareFunc {
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			origin := c.Request().Header.Get("Origin")
+
+			// Check if origin is allowed
+			allowed := false
+			for _, allowedOrigin := range config.AllowedOrigins {
+				if origin == allowedOrigin || allowedOrigin == "*" {
+					allowed = true
+					break
+				}
+			}
+
+			if !allowed {
+				return c.JSON(http.StatusForbidden, map[string]string{
+					"error": "Origin not allowed",
+				})
+			}
+
+			// Set CORS headers
+			c.Response().Header().Set("Access-Control-Allow-Origin", origin)
+			c.Response().Header().Set("Access-Control-Allow-Methods", strings.Join(config.AllowedMethods, ", "))
+			c.Response().Header().Set("Access-Control-Allow-Headers", strings.Join(config.AllowedHeaders, ", "))
+			c.Response().Header().Set("Access-Control-Expose-Headers", strings.Join(config.ExposedHeaders, ", "))
+			c.Response().Header().Set("Access-Control-Allow-Credentials", "true")
+			c.Response().Header().Set("Access-Control-Max-Age", strconv.Itoa(config.MaxAge))
+
+			// Handle preflight
+			if c.Request().Method == "OPTIONS" {
+				return c.NoContent(http.StatusNoContent)
+			}
+
+			return next(c)
+		}
+	}
+}