Subversion Repositories ESP8266_P1_Meter

// Captive Portal - what is needed

// - DNS Server + Catch-all Handler class

// - OR: DNS-Server + device specific request handlers (/generate_204, /success.html, etc.)

// -> these seem to work with recent stock Android and iPhones

//

// - IP-config seems to be necessary for all Samsung phones (since they use hard-coded

//   DNS for connectivitycheck.gstatic.com)

#ifdef ESP32

#include <WiFi.h>

#elif defined(ESP8266)

#include <ESP8266WiFi.h>

#else

#error "Captive portal needs ESP32 or ESP8266 platform"

#endif

#include <DNSServer.h>

#include "ESPAsyncWebServer.h"

#include "AsyncFsWebServer.h"

// Inspiration: https://github.com/andig/vzero/blob/master/src/webserver.cpp

class CaptiveRequestHandler : public AsyncWebHandler

{

public:

    explicit CaptiveRequestHandler(String redirectTargetURL) :

        targetURL(buildTargetURL(redirectTargetURL))

    {

    }

    virtual ~CaptiveRequestHandler() {}

    const String targetURL;

    static String buildTargetURL(const String& redirect) {

        String s;

        s.reserve(64);

        s += "http://";

        s += WiFi.softAPIP().toString();

        s += redirect;

        return s;

    }

    bool canHandle(AsyncWebServerRequest *request) const override {

        if (request->host() != WiFi.softAPIP().toString())

            return true;

        else

            return false;

    }

    void handleRequest(AsyncWebServerRequest *request) override

    {

        request->redirect(targetURL);

        log_info("Captive handler triggered. Requested %s%s -> redirecting to %s", request->host().c_str(), request->url().c_str(), targetURL.c_str());

    }

};