yoursunny/.gitignore

## .gitignore
/.vscode
/data

## CaptivePortal.ino
#include <FS.h>
#include <ESP8266WiFi.h>
#include <DNSServer.h>
#include <ESP8266WebServer.h>
#include <PString.h>
#include <Streaming.h>

const IPAddress apIp(192, 168, 0, 1);
DNSServer dnsServer;
ESP8266WebServer server(80);

struct PrintMac
{
  const uint8_t* mac;
};

Print&
operator<<(Print& p, const PrintMac& pmac)
{
  const uint8_t* mac = pmac.mac;
  for (int i = 0; i < 6; ++i) {
    if (i > 0) {
      p << ':';
    }
    p << _WIDTHZ(_HEX(mac[i]), 2);
  }
  return p;
}

File logfile;
char logbuf[256];
PString logline(logbuf, sizeof(logbuf));

void
appendLog()
{
  const char* line = logline;
  Serial << millis() << ' ' << line << '\n';
  logfile << millis() << ' ' << line << '\n';
  logline.begin();
}

void
wifiStaConnect(const WiFiEventSoftAPModeStationConnected& evt)
{
  logline << PrintMac{evt.mac} << " assoc";
  appendLog();
}
WiFiEventHandler wifiStaConnectHandler;

void
wifiStaDisconnect(const WiFiEventSoftAPModeStationDisconnected& evt)
{
  logline << PrintMac{evt.mac} << " deassoc";
  appendLog();
}
WiFiEventHandler wifiStaDisconnectHandler;

void
httpDefault()
{
  logline << server.client().remoteIP() << " redirect";
  appendLog();
  server.sendHeader("Location", "http://freewifi.lan/", true);
  server.send(302, "text/plain", "");
  server.client().stop();
}

void
httpHome()
{
  if (server.hostHeader() != String("freewifi.lan")) {
    return httpDefault();
  }

  logline << server.client().remoteIP() << " home";
  appendLog();
  File file = SPIFFS.open("/index.htm.gz", "r");
  server.streamFile(file, "text/html");
  file.close();
}

void
httpConnect()
{
  logline << server.client().remoteIP() << " connect " << server.arg("email");
  appendLog();
  File file = SPIFFS.open("/connect.htm.gz", "r");
  server.streamFile(file, "text/html");
  file.close();
}

void
httpPureCss()
{
  File file = SPIFFS.open("/pure.css.gz", "r");
  server.streamFile(file, "text/css");
  file.close();
}

void
httpLog()
{
  logline << server.client().remoteIP() << " log";
  appendLog();
  logfile.seek(0, SeekSet);
  server.streamFile(logfile, "text/plain");
  logfile.seek(0, SeekEnd);
}

void
setup()
{
  Serial.begin(115200);
  Serial.println();
  Serial.println();

  SPIFFS.begin();
  logfile = SPIFFS.open("/log.txt", "a+");

  WiFi.persistent(false);
  WiFi.disconnect(true);
  wifiStaConnectHandler = WiFi.onSoftAPModeStationConnected(wifiStaConnect);
  wifiStaDisconnectHandler = WiFi.onSoftAPModeStationDisconnected(wifiStaDisconnect);
  WiFi.mode(WIFI_AP);
  WiFi.softAPConfig(apIp, apIp, IPAddress(255, 255, 255, 0));
  WiFi.softAP("freewifi", nullptr, 1);

  dnsServer.setErrorReplyCode(DNSReplyCode::NoError);
  dnsServer.start(53, "*", apIp);

  server.on("/", httpHome);
  server.on("/connect", httpConnect);
  server.on("/pure.css", httpPureCss);
  server.on("/log.txt", httpLog);
  server.onNotFound(httpDefault);
  server.begin();

  Serial << "ready" << endl;
}

void
loop()
{
  dnsServer.processNextRequest();
  server.handleClient();
}

## connect.htm
<!DOCTYPE html>
<title>Free WiFi</title>
<meta name="viewport" content="initial-scale=1.0">
<link rel="stylesheet" href="pure.css">

<h1>Connected to Free WiFi</h1>

<p>No, you don't get Internet access.
We offer free WiFi, but we didn't offer Internet access through WiFi.</p>

## index.htm
<!DOCTYPE html>
<title>Free WiFi</title>
<meta name="viewport" content="initial-scale=1.0">
<link rel="stylesheet" href="pure.css">

<h1>Welcome to Free WiFi</h1>

<form action="/connect" class="pure-form pure-form-aligned">
<fieldset>
<div class="pure-control-group">
  <label for="email">Email</label>
  <input name="email" id="email" type="email" required placeholder="someone@example.com">
</div>
<div class="pure-controls">
  <label class="pure-checkbox">
    <input type="checkbox" required>
    I've read the terms and conditions
  </label>
  <input type="submit" class="pure-button pure-button-primary" value="Connect">
</div>
</fieldset>
</form>

## prepare-data.sh
#!/bin/bash
set -eo pipefail

mkdir -p data
for P in index connect; do
  gzip < $P.htm > data/$P.htm.gz
done
if ! [[ -f data/pure.css.gz ]]; then
  curl -sL http://yui.yahooapis.com/pure/0.6.0/pure-min.css | gzip > data/pure.css.gz
fi
	#include <FS.h>
	#include <ESP8266WiFi.h>
	#include <DNSServer.h>
	#include <ESP8266WebServer.h>
	#include <PString.h>
	#include <Streaming.h>

	const IPAddress apIp(192, 168, 0, 1);
	DNSServer dnsServer;
	ESP8266WebServer server(80);

	struct PrintMac
	{
	const uint8_t* mac;
	};

	Print&
	operator<<(Print& p, const PrintMac& pmac)
	{
	const uint8_t* mac = pmac.mac;
	for (int i = 0; i < 6; ++i) {
	if (i > 0) {
	p << ':';
	}
	p << _WIDTHZ(_HEX(mac[i]), 2);
	}
	return p;
	}

	File logfile;
	char logbuf[256];
	PString logline(logbuf, sizeof(logbuf));

	void
	appendLog()
	{
	const char* line = logline;
	Serial << millis() << ' ' << line << '\n';
	logfile << millis() << ' ' << line << '\n';
	logline.begin();
	}

	void
	wifiStaConnect(const WiFiEventSoftAPModeStationConnected& evt)
	{
	logline << PrintMac{evt.mac} << " assoc";
	appendLog();
	}
	WiFiEventHandler wifiStaConnectHandler;

	void
	wifiStaDisconnect(const WiFiEventSoftAPModeStationDisconnected& evt)
	{
	logline << PrintMac{evt.mac} << " deassoc";
	appendLog();
	}
	WiFiEventHandler wifiStaDisconnectHandler;

	void
	httpDefault()
	{
	logline << server.client().remoteIP() << " redirect";
	appendLog();
	server.sendHeader("Location", "http://freewifi.lan/", true);
	server.send(302, "text/plain", "");
	server.client().stop();
	}

	void
	httpHome()
	{
	if (server.hostHeader() != String("freewifi.lan")) {
	return httpDefault();
	}

	logline << server.client().remoteIP() << " home";
	appendLog();
	File file = SPIFFS.open("/index.htm.gz", "r");
	server.streamFile(file, "text/html");
	file.close();
	}

	void
	httpConnect()
	{
	logline << server.client().remoteIP() << " connect " << server.arg("email");
	appendLog();
	File file = SPIFFS.open("/connect.htm.gz", "r");
	server.streamFile(file, "text/html");
	file.close();
	}

	void
	httpPureCss()
	{
	File file = SPIFFS.open("/pure.css.gz", "r");
	server.streamFile(file, "text/css");
	file.close();
	}

	void
	httpLog()
	{
	logline << server.client().remoteIP() << " log";
	appendLog();
	logfile.seek(0, SeekSet);
	server.streamFile(logfile, "text/plain");
	logfile.seek(0, SeekEnd);
	}

	void
	setup()
	{
	Serial.begin(115200);
	Serial.println();
	Serial.println();

	SPIFFS.begin();
	logfile = SPIFFS.open("/log.txt", "a+");

	WiFi.persistent(false);
	WiFi.disconnect(true);
	wifiStaConnectHandler = WiFi.onSoftAPModeStationConnected(wifiStaConnect);
	wifiStaDisconnectHandler = WiFi.onSoftAPModeStationDisconnected(wifiStaDisconnect);
	WiFi.mode(WIFI_AP);
	WiFi.softAPConfig(apIp, apIp, IPAddress(255, 255, 255, 0));
	WiFi.softAP("freewifi", nullptr, 1);

	dnsServer.setErrorReplyCode(DNSReplyCode::NoError);
	dnsServer.start(53, "*", apIp);

	server.on("/", httpHome);
	server.on("/connect", httpConnect);
	server.on("/pure.css", httpPureCss);
	server.on("/log.txt", httpLog);
	server.onNotFound(httpDefault);
	server.begin();

	Serial << "ready" << endl;
	}

	void
	loop()
	{
	dnsServer.processNextRequest();
	server.handleClient();
	}
	<!DOCTYPE html>
	<title>Free WiFi</title>
	<meta name="viewport" content="initial-scale=1.0">
	<link rel="stylesheet" href="pure.css">

	<h1>Connected to Free WiFi</h1>

	<p>No, you don't get Internet access.
	We offer free WiFi, but we didn't offer Internet access through WiFi.</p>
	#!/bin/bash
	set -eo pipefail

	mkdir -p data
	for P in index connect; do
	gzip < $P.htm > data/$P.htm.gz
	done
	if ! [[ -f data/pure.css.gz ]]; then
	curl -sL http://yui.yahooapis.com/pure/0.6.0/pure-min.css \| gzip > data/pure.css.gz
	fi