first commit

backend/internal/security/headers.go

@@ -0,0 +1,43 @@
+package security
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+)
+
+func Headers() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		c.Header("Content-Security-Policy", "default-src 'self'; frame-ancestors 'none'")
+		c.Header("X-Content-Type-Options", "nosniff")
+		c.Header("X-Frame-Options", "DENY")
+		c.Header("Referrer-Policy", "strict-origin-when-cross-origin")
+		c.Header("Permissions-Policy", "camera=(), microphone=(), geolocation=()")
+		c.Next()
+	}
+}
+
+func CORS(allowedOrigins []string) gin.HandlerFunc {
+	allowed := map[string]bool{}
+	for _, origin := range allowedOrigins {
+		allowed[strings.TrimSpace(origin)] = true
+	}
+
+	return func(c *gin.Context) {
+		origin := c.GetHeader("Origin")
+		if allowed[origin] {
+			c.Header("Access-Control-Allow-Origin", origin)
+			c.Header("Access-Control-Allow-Credentials", "true")
+			c.Header("Access-Control-Allow-Headers", "Authorization, Content-Type")
+			c.Header("Access-Control-Allow-Methods", "GET, POST, PATCH, DELETE, OPTIONS")
+		}
+
+		if c.Request.Method == http.MethodOptions {
+			c.AbortWithStatus(http.StatusNoContent)
+			return
+		}
+
+		c.Next()
+	}
+}