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

#include "Firewall.h"

ESPFirewall::ESPFirewall(int port)
{
    log_i("Starting Firewall-API on %i", port);
    this->firewall_api = new AsyncWebServer(port);
    this->setup_routing();
}

void ESPFirewall::add_rule_to_firewall()
{
    firewall_rule_t *temp;
    firewall_rule_t *link = (firewall_rule_t *)malloc(sizeof(firewall_rule_t));
    link->key = ++amount_of_rules;
    if (head == NULL)
    {
        head = link;
        link->next = NULL;
        return;
    }
    temp = head;
    while (temp->next != NULL)
    {
        temp = temp->next;
    }
    temp->next = link;
    link->next = NULL;
    return;
}

void ESPFirewall::get_firewall_handler(AsyncWebServerRequest *request)
{
    firewall_rule_t *ptr = this->head;
    DynamicJsonDocument json(1024);
    String response;
    json["amount"] = amount_of_rules;
    JsonArray rules = json.createNestedArray("rules");
    while (ptr != NULL)
    {
        JsonObject rule = rules.createNestedObject();
        rule["key"] = ptr->key;
        ptr = ptr->next;
    }
    serializeJson(json, response);
    request->send(200, "application/json", response);
}

void ESPFirewall::post_firewall_handler(AsyncWebServerRequest *request)
{
    DynamicJsonDocument json(1024);
    String response;
    int response_code;
    if (request->hasArg("source") || request->hasArg("destination") || request->hasArg("protocol") || request->hasArg("target"))
    {
        String source = request->arg("source");
        String destination = request->arg("destination");
        String protocol = request->arg("protocol");
        String target = request->arg("target");
        json["source"] = source;
        json["destination"] = destination;
        json["protocol"] = protocol;
        json["target"] = target;
        add_rule_to_firewall();
        response_code = 200;
    }
    else
    {
        json["message"] = "not enough parameter provided";
        response_code = 400;
    }
    serializeJson(json, response);
    request->send(response_code, "application/json", response);
}

void ESPFirewall::not_found(AsyncWebServerRequest *request)
{
    DynamicJsonDocument json(1024);
    String response;
    json["message"] = "not found";
    serializeJson(json, response);
    request->send(404, "application/json", response);
}

void ESPFirewall::setup_routing()
{
    firewall_api->on("/api/v1/firewall", HTTP_GET, std::bind(&ESPFirewall::get_firewall_handler, this, std::placeholders::_1));
    firewall_api->on("/api/v1/firewall", HTTP_POST, std::bind(&ESPFirewall::post_firewall_handler, this, std::placeholders::_1));
    firewall_api->onNotFound(std::bind(&ESPFirewall::not_found, this, std::placeholders::_1));
    this->firewall_api->begin();
}