esp-firewall/SourceCode/arduino/lib/Firewall/Firewall.h

#ifndef FIREWALL_H
#define FIREWALL_H

#include "Arduino.h"
#include "AsyncJson.h"
#include "ArduinoJson.h"
#ifdef ESP32
#include "WiFi.h"
#include "AsyncTCP.h"
#elif defined(ESP8266)
#include "ESP8266WiFi.h"
#include "ESPAsyncTCP.h"
#endif
#include "ESPAsyncWebServer.h"

#define PROTOCOL_LENGTH 4
#define TARGET_LENGTH 7

typedef struct firewall_rule
{
    int key;
    char source[IP4ADDR_STRLEN_MAX];
    char destination[IP4ADDR_STRLEN_MAX];
    char protocol[PROTOCOL_LENGTH];
    char target[TARGET_LENGTH];
    struct firewall_rule *next;
} firewall_rule_t;

class ESPFirewall
{
    unsigned int amount_of_rules = 0;
    struct firewall_rule *head = NULL;

    AsyncWebServer *firewall_api;

    // Firewall Actions
    void add_rule_to_firewall(firewall_rule_t *);
    firewall_rule_t *get_rule_from_firewall(int key);

    // Firewall-API Actions
    void setup_routing();
    void json_message_response(AsyncWebServerRequest *, String, int);
    String construct_json_firewall_rule(firewall_rule_t *);
    String construct_json_firewall();
    void not_found(AsyncWebServerRequest *);
    void get_firewall_rule_handler(AsyncWebServerRequest *);
    void get_firewall_rules_handler(AsyncWebServerRequest *);
    void post_firewall_handler(AsyncWebServerRequest *);
    bool request_has_firewall_parameter(AsyncWebServerRequest *);

public:
    ESPFirewall(int port = 8080);
};

#endif