WiFiManager/WiFiManager.h

/**************************************************************
   WiFiManager is a library for the ESP8266/Arduino platform
   (https://github.com/esp8266/Arduino) to enable easy
   configuration and reconfiguration of WiFi credentials using a Captive Portal
   inspired by:
   http://www.esp8266.com/viewtopic.php?f=29&t=2520
   https://github.com/chriscook8/esp-arduino-apboot
   https://github.com/esp8266/Arduino/tree/master/libraries/DNSServer/examples/CaptivePortalAdvanced
   Built by AlexT https://github.com/tzapu
   Licensed under MIT license
 **************************************************************/

#ifndef WiFiManager_h
#define WiFiManager_h

#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
#include <DNSServer.h>
#include <memory>

extern "C" {
  #include "user_interface.h"
}

const char HTTP_HEAD[] PROGMEM            = "<!DOCTYPE html><html lang='en'><head><meta name='viewport' content='width=device-width, initial-scale=1, user-scalable=no'/><title>{v}</title>";
// const char HTTP_STYLE[] PROGMEM           = "<style>.c{text-align: center;} div,input{padding:5px;font-size:1em;} input{width:95%;} body{text-align: center;font-family:verdana;} button{border:0;border-radius:0.3rem;background-color:#1fa3ec;color:#fff;line-height:2.4rem;font-size:1.2rem;width:100%;} .q{float: right;width: 64px;text-align: right;} .l{background: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAMAAABEpIrGAAAALVBMVEX///8EBwfBwsLw8PAzNjaCg4NTVVUjJiZDRUUUFxdiZGSho6OSk5Pg4eFydHTCjaf3AAAAZElEQVQ4je2NSw7AIAhEBamKn97/uMXEGBvozkWb9C2Zx4xzWykBhFAeYp9gkLyZE0zIMno9n4g19hmdY39scwqVkOXaxph0ZCXQcqxSpgQpONa59wkRDOL93eAXvimwlbPbwwVAegLS1HGfZAAAAABJRU5ErkJggg==') no-repeat left center;background-size: 1em;}</style>";
const char HTTP_STYLE[] PROGMEM           = "<style>"
".c,body{text-align:center;font-family:verdana}div,input{padding:5px;font-size:1em}input{width:95%;margin:5px 0}button{border:0;border-radius:.3rem;background-color:#1fa3ec;color:#fff;line-height:2.4rem;font-size:1.2rem;width:100%}"
".wrap {text-align:left;display:inline-block;min-width:260px}"
// links
"a{color:#000;font-weight:700;text-decoration:none}a:hover{color:#1fa3ec;text-decoration:underline}"
// quality icons
".q{height:16px;margin:0;padding:0 5px;text-align:right;min-width:38px;float:right}.q.q-0:after{background-position-x:0}.q.q-1:after{background-position-x:-16px}.q.q-2:after{background-position-x:-32px}.q.q-3:after{background-position-x:-48px}.q.q-4:after{background-position-x:-64px}.q.l:before{background-position-x:-80px;padding-right:5px}.ql .q{float:left}.qinv .q{-webkit-filter:invert(1);filter:invert(1)}.q:after,.q:before{content:'';width:16px;height:16px;display:inline-block;background-repeat:no-repeat;background-position: 16px 0;"
"background-image:url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGAAAAAQCAMAAADeZIrLAAAAJFBMVEX///8AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAADHJj5lAAAAC3RSTlMAIjN3iJmqu8zd7vF8pzcAAABsSURBVHja7Y1BCsAwCASNSVo3/v+/BUEiXnIoXkoX5jAQMxTHzK9cVSnvDxwD8bFx8PhZ9q8FmghXBhqA1faxk92PsxvRc2CCCFdhQCbRkLoAQ3q/wWUBqG35ZxtVzW4Ed6LngPyBU2CobdIDQ5oPWI5nCUwAAAAASUVORK5CYII=');}"
// icons @2x media query (32px rescaled)
"@media (-webkit-min-device-pixel-ratio: 2),(min-resolution: 192dpi){.q:before,.q:after {"
"background-image:url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAALwAAAAgCAMAAACfM+KhAAAALVBMVEX///8AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAADAOrOgAAAADnRSTlMAESIzRGZ3iJmqu8zd7gKjCLQAAACmSURBVHgB7dDBCoMwEEXRmKlVY3L//3NLhyzqIqSUggy8uxnhCR5Mo8xLt+14aZ7wwgsvvPA/ofv9+44334UXXngvb6XsFhO/VoC2RsSv9J7x8BnYLW+AjT56ud/uePMdb7IP8Bsc/e7h8Cfk912ghsNXWPpDC4hvN+D1560A1QPORyh84VKLjjdvfPFm++i9EWq0348XXnjhhT+4dIbCW+WjZim9AKk4UZMnnCEuAAAAAElFTkSuQmCC');"
"background-size: 95px 16px;}}"
// msg callouts
".msg{padding:20px;margin:20px 0;border:1px solid #eee;border-left-width:5px;border-radius:3px;border-left-color:#777}.msg h4{margin-top:0;margin-bottom:5px}.msg.P{border-left-color:#1fa3ec}.msg.P h4{color:#1fa3ec}.msg.D{border-left-color:#d9534f}.msg.D h4{color:#d9534f}"
// lists
"dt{font-weight:bold}dd{margin:0;padding:0 0 0.5em 0}"
"</style>";

const char HTTP_SCRIPT[] PROGMEM          = "<script>function c(l){document.getElementById('s').value=l.innerText||l.textContent;document.getElementById('p').focus();}</script>";
const char HTTP_HEAD_END[] PROGMEM        = "</head><body><div class='wrap'>";
const char HTTP_PORTAL_OPTIONS[] PROGMEM  = "<form action='/wifi' method='GET'><button>Configure WiFi</button></form><br/><form action='/0wifi' method='GET'><button>Configure WiFi (No Scan)</button></form><br/><form action='/i' method='GET'><button>Info</button></form><br/><form action='/r' method='GET'><button>Restart</button></form>";
const char HTTP_ITEM[] PROGMEM            = "<div><a href='#p' onclick='c(this)'>{v}</a> {R} {e} {r}<div role='img' aria-label='{r}%' title='{r}%' class='q q-{q} {i}'></div></div>";
// const char HTTP_ITEM[] PROGMEM         = "<div><a href='#p' onclick='c(this)'>{v}</a> {R} {r}% {q} {e}</div>"; // test all tokens
//const char HTTP_ITEM_PADLOCK[] PROGMEM = "<img src='data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAMAAABEpIrGAAAALVBMVEX///8EBwfBwsLw8PAzNjaCg4NTVVUjJiZDRUUUFxdiZGSho6OSk5Pg4eFydHTCjaf3AAAAZElEQVQ4je2NSw7AIAhEBamKn97/uMXEGBvozkWb9C2Zx4xzWykBhFAeYp9gkLyZE0zIMno9n4g19hmdY39scwqVkOXaxph0ZCXQcqxSpgQpONa59wkRDOL93eAXvimwlbPbwwVAegLS1HGfZAAAAABJRU5ErkJggg==' width='13px'/>";
const char HTTP_FORM_START[] PROGMEM      = "<form method='POST' action='wifisave'><label for='s'>SSID</label><input id='s' name='s' maxlength=32 placeholder='{v}'><br/><label for='p'>Password</label><input id='p' name='p' length=64 type='password' placeholder=''><br/>";
const char HTTP_FORM_END[] PROGMEM        = "<br/><button type='submit'>Save</button></form>";
const char HTTP_FORM_LABEL[] PROGMEM      = "<label for='{i}'>{t}</label>";
const char HTTP_FORM_PARAM_START[] PROGMEM = "<hr>";
const char HTTP_FORM_PARAM[] PROGMEM      = "<br/><input id='{i}' name='{n}' maxlength={l} placeholder='' value='{v}' {c}>";
const char HTTP_FORM_PARAM_END[] PROGMEM  = "<br/>";
const char HTTP_SCAN_LINK[] PROGMEM       = "<br/><form action='/wifi' method='get'><button>Refresh</button></form>";
const char HTTP_SAVED[] PROGMEM           = "<div class='msg'>Saving Credentials<br/>Trying to connect ESP to network.<br />If it fails reconnect to AP to try again</div>";
const char HTTP_END[] PROGMEM             = "</div></body></html>";

#define WIFI_MANAGER_MAX_PARAMS 10

#define WFM_LABEL_BEFORE 1
#define WFM_LABEL_AFTER 2
#define WFM_NO_LABEL 0

class WiFiManagerParameter {
  public:
    WiFiManagerParameter(const char *custom);
    WiFiManagerParameter(const char *id, const char *placeholder, const char *defaultValue, int length);
    WiFiManagerParameter(const char *id, const char *placeholder, const char *defaultValue, int length, const char *custom);
    WiFiManagerParameter(const char *id, const char *placeholder, const char *defaultValue, int length, const char *custom, int labelPlacement);

    const char *getID();
    const char *getValue();
    const char *getPlaceholder();
    int         getValueLength();
    int         getLabelPlacement();
    const char *getCustomHTML();
  private:
    const char *_id;
    const char *_placeholder;
    char       *_value;
    int         _length;
    int         _labelPlacement;
    const char *_customHTML;

    void init(const char *id, const char *placeholder, const char *defaultValue, int length, const char *custom);
    void init(const char *id, const char *placeholder, const char *defaultValue, int length, const char *custom, int labelPlacement);

    friend class WiFiManager;
};


class WiFiManager
{
  public:
    WiFiManager();
    ~WiFiManager();

    boolean       autoConnect();
    boolean       autoConnect(char const *apName, char const *apPassword = NULL);

    //if you want to always start the config portal, without trying to connect first
    boolean       startConfigPortal();
    boolean       startConfigPortal(char const *apName, char const *apPassword = NULL);
    boolean       process();

    // get the AP name of the config portal, so it can be used in the callback
    String        getConfigPortalSSID();

    void          resetSettings();

    //sets timeout before webserver loop ends and exits even if there has been no setup.
    //useful for devices that failed to connect at some point and got stuck in a webserver loop
    //in seconds setConfigPortalTimeout is a new name for setTimeout
    void          setConfigPortalTimeout(unsigned long seconds);
    void          setTimeout(unsigned long seconds);

    //sets timeout for which to attempt connecting, useful if you get a lot of failed connects
    void          setConnectTimeout(unsigned long seconds);


    void          setDebugOutput(boolean debug);
    //defaults to not showing anything under 8% signal quality if called
    void          setMinimumSignalQuality(int quality = 8);
    //sets a custom ip /gateway /subnet configuration
    void          setAPStaticIPConfig(IPAddress ip, IPAddress gw, IPAddress sn);
    //sets config for a static IP
    void          setSTAStaticIPConfig(IPAddress ip, IPAddress gw, IPAddress sn);
    //called when AP mode and config portal is started
    void          setAPCallback( void (*func)(WiFiManager*) );
    //called when settings have been changed and connection was successful
    void          setSaveConfigCallback( void (*func)(void) );
    //adds a custom parameter
    void          addParameter(WiFiManagerParameter *p);
    //if this is set, it will exit after config, even if connection is unsuccessful.
    void          setBreakAfterConfig(boolean shouldBreak);
    //if this is set, portal will be blocking and wait until save or exit, is false user must manually process to handle config portal
    void          setConfigPortalBlocking(boolean shouldBlock);


    //if this is set, customise style
    void          setCustomHeadElement(const char* element);
    //if this is true, remove duplicated Access Points - defaut true
    void          setRemoveDuplicateAPs(boolean removeDuplicates);
    //setter for ESP wifi.persistent so we can remember it and restore user preference, as WIFi._persistent is protected
    void          setRestorePersistent(boolean persistent);
    //if true, always show static net inputs, IP, subnet, gateway, if false, only show when already set.
    void          setShowStaticFields(boolean alwaysShow);

    void          setCaptivePortalEnable(boolean enabled);

  private:
    std::unique_ptr<DNSServer>        dnsServer;
    std::unique_ptr<ESP8266WebServer> server;

    //const int     WM_DONE                 = 0;
    //const int     WM_WAIT                 = 10;

    //const String  HTTP_HEAD = "<!DOCTYPE html><html lang=\"en\"><head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\"/><title>{v}</title>";

    void          setupConfigPortal();
    void          startWPS();
    bool          startAP();

    // typedef enum WiFiMode 
    // {
    //     WIFI_OFF = 0, WIFI_STA = 1, WIFI_AP = 2, WIFI_AP_STA = 3
    // } WiFiMode_t;

    String        _apName                 = "no-net";
    String        _apPassword             = "";
    String        _ssid                   = "";
    String        _pass                   = "";
    unsigned long _configPortalTimeout    = 0;
    unsigned long _connectTimeout         = 0;
    unsigned long _configPortalStart      = 0;
    boolean       _userpersistent         = true;
    WiFiMode_t    _usermode               = WIFI_OFF;
    boolean       _enableCaptivePortal    = true;

    IPAddress     _ap_static_ip;
    IPAddress     _ap_static_gw;
    IPAddress     _ap_static_sn;
    IPAddress     _sta_static_ip;
    IPAddress     _sta_static_gw;
    IPAddress     _sta_static_sn;
    boolean       _sta_show_static_fields = true;

    // option parameters
    int           _paramsCount            = 0;
    int           _minimumQuality         = -1;
    boolean       _removeDuplicateAPs     = true;
    boolean       _shouldBreakAfterConfig = false;
    boolean       _tryWPS                 = false;
    boolean       _configPortalIsBlocking = true;

    const char*   _customHeadElement      = "";

    //String        getEEPROMString(int start, int len);
    //void          setEEPROMString(int start, int len, String string);

    int           status = WL_IDLE_STATUS;
    int           connectWifi(String ssid, String pass);
    uint8_t       waitForConnectResult();
    uint8_t       waitForConnectResult(uint16_t timeout);

    void          handleRoot();
    void          handleWifi(boolean scan);
    void          handleWifiSave();
    void          handleInfo();
    void          handleReset();
    void          handleNotFound();
    void          handle204();
    boolean       captivePortal();
    boolean       configPortalHasTimeout();
    boolean       stopConfigPortal();
    uint8_t       handleConfigPortal();
    bool          wifimode(WiFiMode_t m);
    bool          wifioff();

    String        getParamOut();
    String        getScanItemOut();
    String        getStaticOut();

    // DNS server
    const byte    DNS_PORT = 53;

    //helpers
    int           getRSSIasQuality(int RSSI);
    boolean       isIp(String str);
    String        toStringIp(IPAddress ip);
    boolean       validApPassword();
    String        encryptionTypeStr(uint8_t authmode);
    void          reportStatus(String &page);

    boolean       connect;
    boolean       configPortalActive = false;
    boolean       _debug = true;

    void (*_apcallback)(WiFiManager*) = NULL;
    void (*_savecallback)(void) = NULL;

    WiFiManagerParameter* _params[WIFI_MANAGER_MAX_PARAMS];

    template <typename Generic>
    void          DEBUG_WM(Generic text);

    template <class T>
    auto optionalIPFromString(T *obj, const char *s) -> decltype(  obj->fromString(s)  ) {
      return  obj->fromString(s);
    }
    auto optionalIPFromString(...) -> bool {
      DEBUG_WM("NO fromString METHOD ON IPAddress, you need ESP8266 core 2.1.0 or newer for Custom IP configuration to work.");
      return false;
    }
};

#endif