include/security_headers_middleware.hpp

#pragma once

#include <crow/http_request.h>
#include <crow/http_response.h>

namespace crow {
static const char* strictTransportSecurityKey = "Strict-Transport-Security";
static const char* strictTransportSecurityValue =
    "max-age=31536000; includeSubdomains; preload";

static const char* uaCompatabilityKey = "X-UA-Compatible";
static const char* uaCompatabilityValue = "IE=11";

static const char* xframeKey = "X-Frame-Options";
static const char* xframeValue = "DENY";

static const char* xssKey = "X-XSS-Protection";
static const char* xssValue = "1; mode=block";

static const char* contentSecurityKey = "X-Content-Security-Policy";
static const char* contentSecurityValue = "default-src 'self'";

static const char* pragmaKey = "Pragma";
static const char* pragmaValue = "no-cache";

static const char* cacheControlKey = "Cache-Control";
static const char* cacheControlValue = "no-Store,no-Cache";

struct SecurityHeadersMiddleware {
  struct Context {};

  void beforeHandle(crow::Request& req, Response& res, Context& ctx) {}

  void afterHandle(Request& req, Response& res, Context& ctx) {
    /*
     TODO(ed) these should really check content types.  for example,
     X-UA-Compatible header doesn't make sense when retrieving a JSON or
     javascript file.  It doesn't hurt anything, it's just ugly.
     */
    res.addHeader(strictTransportSecurityKey, strictTransportSecurityValue);
    res.addHeader(uaCompatabilityKey, uaCompatabilityValue);
    res.addHeader(xframeKey, xframeValue);
    res.addHeader(xssKey, xssValue);
    res.addHeader(contentSecurityKey, contentSecurityValue);
    res.addHeader(pragmaKey, pragmaValue);
    res.addHeader(cacheControlKey, cacheControlValue);
  }
};
}  // namespace crow