[friendica-addons.git] / windowsphonepush / windowsphonepush.php

<?php

/**
 * Name: WindowsPhonePush
 * Description: Enable push notification to send information to Friendica Mobile app on Windows phone (count of unread timeline entries, text of last posting - if wished by user)
 * Version: 2.0
 * Author: Gerhard Seeber <http://friendica.seeber.at/profile/admin>
 *
 *
 * Pre-requisite: Windows Phone mobile device (at least WP 7.0)
 *                Friendica mobile app on Windows Phone
 *
 * When addon is installed, the system calls the addon
 * name_install() function, located in 'addon/name/name.php',
 * where 'name' is the name of the addon.
 * If the addon is removed from the configuration list, the
 * system will call the name_uninstall() function.
 *
 * Version history:
 * 1.1  : addon crashed on php versions >= 5.4 as of removed deprecated call-time
 *        pass-by-reference used in function calls within function windowsphonepush_content
 * 2.0  : adaption for supporting emphasizing new entries in app (count on tile cannot be read out,
 *        so we need to retrieve counter through show_settings secondly). Provide new function for
 *        calling from app to set the counter back after start (if user starts again before cronjob
 *        sets the counter back
 *        count only unseen elements which are not type=activity (likes and dislikes not seen as new elements)
 */

use Friendica\App;
use Friendica\Content\Text\BBCode;
use Friendica\Content\Text\HTML;
use Friendica\Core\Addon;
use Friendica\Core\L10n;
use Friendica\Core\PConfig;
use Friendica\Model\User;

function windowsphonepush_install()
{
        /* Our addon will attach in three places.
         * The first is within cron - so the push notifications will be
         * sent every 10 minutes (or whatever is set in crontab).
         */
        Addon::registerHook('cron', 'addon/windowsphonepush/windowsphonepush.php', 'windowsphonepush_cron');

        /* Then we'll attach into the addon settings page, and also the
         * settings post hook so that we can create and update
         * user preferences. User shall be able to activate the addon and
         * define whether he allows pushing first characters of item text
         */
        Addon::registerHook('addon_settings', 'addon/windowsphonepush/windowsphonepush.php', 'windowsphonepush_settings');
        Addon::registerHook('addon_settings_post', 'addon/windowsphonepush/windowsphonepush.php', 'windowsphonepush_settings_post');

        logger("installed windowsphonepush");
}

function windowsphonepush_uninstall()
{
        /* uninstall unregisters any hooks created with register_hook
         * during install. Don't delete data in table `pconfig`.
         */
        Addon::unregisterHook('cron', 'addon/windowsphonepush/windowsphonepush.php', 'windowsphonepush_cron');
        Addon::unregisterHook('addon_settings', 'addon/windowsphonepush/windowsphonepush.php', 'windowsphonepush_settings');
        Addon::unregisterHook('addon_settings_post', 'addon/windowsphonepush/windowsphonepush.php', 'windowsphonepush_settings_post');

        logger("removed windowsphonepush");
}

/* declare the windowsphonepush function so that /windowsphonepush url requests will land here */
function windowsphonepush_module()
{

}

/* Callback from the settings post function.
 * $post contains the $_POST array.
 * We will make sure we've got a valid user account
 * and if so set our configuration setting for this person.
 */
function windowsphonepush_settings_post($a, $post)
{
        if (!local_user() || (!x($_POST, 'windowsphonepush-submit'))) {
                return;
        }
        $enable = intval($_POST['windowsphonepush']);
        PConfig::set(local_user(), 'windowsphonepush', 'enable', $enable);

        if ($enable) {
                PConfig::set(local_user(), 'windowsphonepush', 'counterunseen', 0);
        }

        PConfig::set(local_user(), 'windowsphonepush', 'senditemtext', intval($_POST['windowsphonepush-senditemtext']));

        info(L10n::t('WindowsPhonePush settings updated.') . EOL);
}

/* Called from the Addon Setting form.
 * Add our own settings info to the page.
 */
function windowsphonepush_settings(&$a, &$s)
{
        if (!local_user()) {
                return;
        }

        /* Add our stylesheet to the page so we can make our settings look nice */
        $a->page['htmlhead'] .= '<link rel="stylesheet"  type="text/css" href="' . $a->get_baseurl() . '/addon/windowsphonepush/windowsphonepush.css' . '" media="all" />' . "\r\n";

        /* Get the current state of our config variables */
        $enabled = PConfig::get(local_user(), 'windowsphonepush', 'enable');
        $checked_enabled = (($enabled) ? ' checked="checked" ' : '');

        $senditemtext = PConfig::get(local_user(), 'windowsphonepush', 'senditemtext');
        $checked_senditemtext = (($senditemtext) ? ' checked="checked" ' : '');

        $device_url = PConfig::get(local_user(), 'windowsphonepush', 'device_url');

        /* Add some HTML to the existing form */
        $s .= '<div class="settings-block">';
        $s .= '<h3>' . L10n::t('WindowsPhonePush Settings') . '</h3>';

        $s .= '<div id="windowsphonepush-enable-wrapper">';
        $s .= '<label id="windowsphonepush-enable-label" for="windowsphonepush-enable-chk">' . L10n::t('Enable WindowsPhonePush Addon') . '</label>';
        $s .= '<input id="windowsphonepush-enable-chk" type="checkbox" name="windowsphonepush" value="1" ' . $checked_enabled . '/>';
        $s .= '</div><div class="clear"></div>';

        $s .= '<div id="windowsphonepush-senditemtext-wrapper">';
        $s .= '<label id="windowsphonepush-senditemtext-label" for="windowsphonepush-senditemtext-chk">' . L10n::t('Push text of new item') . '</label>';
        $s .= '<input id="windowsphonepush-senditemtext-chk" type="checkbox" name="windowsphonepush-senditemtext" value="1" ' . $checked_senditemtext . '/>';
        $s .= '</div><div class="clear"></div>';

        /* provide a submit button - enable und senditemtext can be changed by the user */
        $s .= '<div class="settings-submit-wrapper" ><input type="submit" id="windowsphonepush-submit" name="windowsphonepush-submit" class="settings-submit" value="' . L10n::t('Save Settings') . '" /></div><div class="clear"></div>';

        /* provide further read-only information concerning the addon (useful for */
        $s .= '<div id="windowsphonepush-device_url-wrapper">';
        $s .= '<label id="windowsphonepush-device_url-label" for="windowsphonepush-device_url-text">Device-URL</label>';
        $s .= '<input id="windowsphonepush-device_url-text" type="text" readonly value=' . $device_url . '/>';
        $s .= '</div><div class="clear"></div></div>';

        return;
}

/* Cron function used to regularly check all users on the server with active windowsphonepushaddon and send
 * notifications to the Microsoft servers and consequently to the Windows Phone device
 */
function windowsphonepush_cron()
{
        // retrieve all UID's for which the addon windowsphonepush is enabled and loop through every user
        $r = q("SELECT * FROM `pconfig` WHERE `cat` = 'windowsphonepush' AND `k` = 'enable' AND `v` = 1");
        if (count($r)) {
                foreach ($r as $rr) {
                        // load stored information for the user-id of the current loop
                        $device_url = PConfig::get($rr['uid'], 'windowsphonepush', 'device_url');
                        $lastpushid = PConfig::get($rr['uid'], 'windowsphonepush', 'lastpushid');

                        // pushing only possible if device_url (the URI on Microsoft server) is available or not "NA" (which will be sent
                        // by app if user has switched the server setting in app - sending blank not possible as this would return an update error)
                        if (( $device_url == "" ) || ( $device_url == "NA" )) {
                                // no Device-URL for the user availabe, but addon is enabled --> write info to Logger
                                logger("WARN: windowsphonepush is enable for user " . $rr['uid'] . ", but no Device-URL is specified for the user.");
                        } else {
                                // retrieve the number of unseen items and the id of the latest one (if there are more than
                                // one new entries since last poller run, only the latest one will be pushed)
                                $count = q("SELECT count(`id`) as count, max(`id`) as max FROM `item` WHERE `unseen` = 1 AND `type` <> 'activity' AND `uid` = %d", intval($rr['uid']));

                                // send number of unseen items to the device (the number will be displayed on Start screen until
                                // App will be started by user) - this update will be sent every 10 minutes to update the number to 0 if
                                // user has loaded the timeline through app or website
                                $res_tile = send_tile_update($device_url, "", $count[0]['count'], "");
                                switch (trim($res_tile)) {
                                        case "Received":
                                                // ok, count has been pushed, let's save it in personal settings
                                                PConfig::set($rr['uid'], 'windowsphonepush', 'counterunseen', $count[0]['count']);
                                                break;
                                        case "QueueFull":
                                                // maximum of 30 messages reached, server rejects any further push notification until device reconnects
                                                logger("INFO: Device-URL '" . $device_url . "' returns a QueueFull.");
                                                break;
                                        case "Suppressed":
                                                // notification received and dropped as something in app was not enabled
                                                logger("WARN. Device-URL '" . $device_url . "' returns a Suppressed. Unexpected error in Mobile App?");
                                                break;
                                        case "Dropped":
                                                // mostly combines with Expired, in that case Device-URL will be deleted from pconfig (function send_push)
                                                break;
                                        default:
                                                // error, mostly called by "" which means that the url (not "" which has been checked)
                                                // didn't not received Microsoft Notification Server -> wrong url
                                                logger("ERROR: specified Device-URL '" . $device_url . "' didn't produced any response.");
                                }

                                // additionally user receives the text of the newest item (function checks against last successfully pushed item)
                                if (intval($count[0]['max']) > intval($lastpushid)) {
                                        // user can define if he wants to see the text of the item in the push notification
                                        // this has been implemented as the device_url is not a https uri (not so secure)
                                        $senditemtext = PConfig::get($rr['uid'], 'windowsphonepush', 'senditemtext');
                                        if ($senditemtext == 1) {
                                                // load item with the max id
                                                $item = q("SELECT `author-name` as author, `body` as body FROM `item` where `id` = %d", intval($count[0]['max']));

                                                // as user allows to send the item, we want to show the sender of the item in the toast
                                                // toasts are limited to one line, therefore place is limited - author shall be in
                                                // max. 15 chars (incl. dots); author is displayed in bold font
                                                $author = $item[0]['author'];
                                                $author = ((strlen($author) > 12) ? substr($author, 0, 12) . "..." : $author);

                                                // normally we show the body of the item, however if it is an url or an image we cannot
                                                // show this in the toast (only test), therefore changing to an alternate text
                                                // Otherwise BBcode-Tags will be eliminated and plain text cutted to 140 chars (incl. dots)
                                                // BTW: information only possible in English
                                                $body = $item[0]['body'];
                                                if (substr($body, 0, 4) == "[url") {
                                                        $body = "URL/Image ...";
                                                } else {
                                                        $body = BBCode::convert($body, false, 2, true);
                                                        $body = HTML::toPlaintext($body, 0);
                                                        $body = ((strlen($body) > 137) ? substr($body, 0, 137) . "..." : $body);
                                                }
                                        } else {
                                                // if user wishes higher privacy, we only display "Friendica - New timeline entry arrived"
                                                $author = "Friendica";
                                                $body = "New timeline entry arrived ...";
                                        }
                                        // only if toast push notification returns the Notification status "Received" we will update th settings with the
                                        // new indicator max-id is checked against (QueueFull, Suppressed, N/A, Dropped shall qualify to resend
                                        // the push notification some minutes later (BTW: if resulting in Expired for subscription status the
                                        // device_url will be deleted (no further try on this url, see send_push)
                                        // further log information done on count pushing with send_tile (see above)
                                        $res_toast = send_toast($device_url, $author, $body);
                                        if (trim($res_toast) === 'Received') {
                                                PConfig::set($rr['uid'], 'windowsphonepush', 'lastpushid', $count[0]['max']);
                                        }
                                }
                        }
                }
        }
}

/* Tile push notification change the number in the icon of the App in Start Screen of
 * a Windows Phone Device, Image could be changed, not used for App "Friendica Mobile"
 */
function send_tile_update($device_url, $image_url, $count, $title, $priority = 1)
{
        $msg = "<?xml version=\"1.0\" encoding=\"utf-8\"?>" .
                "<wp:Notification xmlns:wp=\"WPNotification\">" .
                "<wp:Tile>" .
                "<wp:BackgroundImage>" . $image_url . "</wp:BackgroundImage>" .
                "<wp:Count>" . $count . "</wp:Count>" .
                "<wp:Title>" . $title . "</wp:Title>" .
                "</wp:Tile> " .
                "</wp:Notification>";

        $result = send_push($device_url, [
                'X-WindowsPhone-Target: token',
                'X-NotificationClass: ' . $priority,
                ], $msg);
        return $result;
}

/* Toast push notification send information to the top of the display
 * if the user is not currently using the Friendica Mobile App, however
 * there is only one line for displaying the information
 */
function send_toast($device_url, $title, $message, $priority = 2)
{
        $msg = "<?xml version=\"1.0\" encoding=\"utf-8\"?>" .
                "<wp:Notification xmlns:wp=\"WPNotification\">" .
                "<wp:Toast>" .
                "<wp:Text1>" . $title . "</wp:Text1>" .
                "<wp:Text2>" . $message . "</wp:Text2>" .
                "<wp:Param></wp:Param>" .
                "</wp:Toast>" .
                "</wp:Notification>";

        $result = send_push($device_url, [
                'X-WindowsPhone-Target: toast',
                'X-NotificationClass: ' . $priority,
                ], $msg);
        return $result;
}

// General function to send the push notification via cURL
function send_push($device_url, $headers, $msg)
{
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $device_url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_HEADER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers + [
                'Content-Type: text/xml',
                'charset=utf-8',
                'Accept: application/*',
                ]
        );
        curl_setopt($ch, CURLOPT_POSTFIELDS, $msg);

        $output = curl_exec($ch);
        curl_close($ch);

        // if we received "Expired" from Microsoft server we will delete the obsolete device-URL
        // and log this fact
        $subscriptionStatus = get_header_value($output, 'X-SubscriptionStatus');
        if ($subscriptionStatus == "Expired") {
                PConfig::set(local_user(), 'windowsphonepush', 'device_url', "");
                logger("ERROR: the stored Device-URL " . $device_url . "returned an 'Expired' error, it has been deleted now.");
        }

        // the notification status shall be returned to windowsphonepush_cron (will
        // update settings if 'Received' otherwise keep old value in settings (on QueuedFull. Suppressed, N/A, Dropped)
        $notificationStatus = get_header_value($output, 'X-NotificationStatus');
        return $notificationStatus;
}

// helper function to receive statuses from webresponse of Microsoft server
function get_header_value($content, $header)
{
        return preg_match_all("/$header: (.*)/i", $content, $match) ? $match[1][0] : "";
}

/* reading information from url and deciding which function to start
 * show_settings = delivering settings to check
 * update_settings = set the device_url
 * update_counterunseen = set counter for unseen elements to zero
 */
function windowsphonepush_content(App $a)
{
        // Login with the specified Network credentials (like in api.php)
        windowsphonepush_login($a);

        $path = $a->argv[0];
        $path2 = $a->argv[1];
        if ($path == "windowsphonepush") {
                switch ($path2) {
                        case "show_settings":
                                windowsphonepush_showsettings($a);
                                killme();
                                break;
                        case "update_settings":
                                $ret = windowsphonepush_updatesettings($a);
                                header("Content-Type: application/json; charset=utf-8");
                                echo json_encode(['status' => $ret]);
                                killme();
                                break;
                        case "update_counterunseen":
                                $ret = windowsphonepush_updatecounterunseen();
                                header("Content-Type: application/json; charset=utf-8");
                                echo json_encode(['status' => $ret]);
                                killme();
                                break;
                        default:
                                echo "Fehler";
                }
        }
}

// return settings for windowsphonepush addon to be able to check them in WP app
function windowsphonepush_showsettings()
{
        if (!local_user()) {
                return;
        }

        $enable = PConfig::get(local_user(), 'windowsphonepush', 'enable');
        $device_url = PConfig::get(local_user(), 'windowsphonepush', 'device_url');
        $senditemtext = PConfig::get(local_user(), 'windowsphonepush', 'senditemtext');
        $lastpushid = PConfig::get(local_user(), 'windowsphonepush', 'lastpushid');
        $counterunseen = PConfig::get(local_user(), 'windowsphonepush', 'counterunseen');
        $addonversion = "2.0";

        if (!$device_url) {
                $device_url = "";
        }

        if (!$lastpushid) {
                $lastpushid = 0;
        }

        header("Content-Type: application/json");
        echo json_encode(['uid' => local_user(),
                'enable' => $enable,
                'device_url' => $device_url,
                'senditemtext' => $senditemtext,
                'lastpushid' => $lastpushid,
                'counterunseen' => $counterunseen,
                'addonversion' => $addonversion]);
}

/* update_settings is used to transfer the device_url from WP device to the Friendica server
 * return the status of the operation to the server
 */
function windowsphonepush_updatesettings()
{
        if (!local_user()) {
                return "Not Authenticated";
        }

        // no updating if user hasn't enabled the addon
        $enable = PConfig::get(local_user(), 'windowsphonepush', 'enable');
        if (!$enable) {
                return "Plug-in not enabled";
        }

        // check if sent url is empty - don't save and send return code to app
        $device_url = $_POST['deviceurl'];
        if ($device_url == "") {
                logger("ERROR: no valid Device-URL specified - client transferred '" . $device_url . "'");
                return "No valid Device-URL specified";
        }

        // check if sent url is already stored in database for another user, we assume that there was a change of
        // the user on the Windows Phone device and that device url is no longer true for the other user, so we
        // et the device_url for the OTHER user blank (should normally not occur as App should include User/server
        // in url request to Microsoft Push Notification server)
        $r = q("SELECT * FROM `pconfig` WHERE `uid` <> " . local_user() . " AND
                                                `cat` = 'windowsphonepush' AND
                                                `k` = 'device_url' AND
                                                `v` = '" . $device_url . "'");
        if (count($r)) {
                foreach ($r as $rr) {
                        PConfig::set($rr['uid'], 'windowsphonepush', 'device_url', '');
                        logger("WARN: the sent URL was already registered with user '" . $rr['uid'] . "'. Deleted for this user as we expect to be correct now for user '" . local_user() . "'.");
                }
        }

        PConfig::set(local_user(), 'windowsphonepush', 'device_url', $device_url);
        // output the successfull update of the device URL to the logger for error analysis if necessary
        logger("INFO: Device-URL for user '" . local_user() . "' has been updated with '" . $device_url . "'");
        return "Device-URL updated successfully!";
}

// update_counterunseen is used to reset the counter to zero from Windows Phone app
function windowsphonepush_updatecounterunseen()
{
        if (!local_user()) {
                return "Not Authenticated";
        }

        // no updating if user hasn't enabled the addon
        $enable = PConfig::get(local_user(), 'windowsphonepush', 'enable');
        if (!$enable) {
                return "Plug-in not enabled";
        }

        PConfig::set(local_user(), 'windowsphonepush', 'counterunseen', 0);
        return "Counter set to zero";
}

/* helper function to login to the server with the specified Network credentials
 * (mainly copied from api.php)
 */
function windowsphonepush_login(App $a)
{
        if (!isset($_SERVER['PHP_AUTH_USER'])) {
                logger('API_login: ' . print_r($_SERVER, true), LOGGER_DEBUG);
                header('WWW-Authenticate: Basic realm="Friendica"');
                header('HTTP/1.0 401 Unauthorized');
                die('This api requires login');
        }

        $user_id = User::authenticate($_SERVER['PHP_AUTH_USER'], trim($_SERVER['PHP_AUTH_PW']));

        if ($user_id) {
                $record = dba::selectFirst('user', [], ['uid' => $user_id]);
        } else {
                logger('API_login failure: ' . print_r($_SERVER, true), LOGGER_DEBUG);
                header('WWW-Authenticate: Basic realm="Friendica"');
                header('HTTP/1.0 401 Unauthorized');
                die('This api requires login');
        }

        require_once 'include/security.php';
        authenticate_success($record);
        $_SESSION["allow_api"] = true;
        Addon::callHooks('logged_in', $a->user);
}