]> git.mxchange.org Git - friendica.git/blobdiff - include/socgraph.php
Better implementation of "hidewall"
[friendica.git] / include / socgraph.php
index 5c9b1d98ad1de08443882ba7f55d15b3c1bc4f10..3718f82306fc7336e8d7db61747bacc540744b2c 100644 (file)
@@ -1,13 +1,17 @@
 <?php
+/**
+ * @file include/socgraph.php
+ * 
+ * @todo Move GNU Social URL schemata (http://server.tld/user/number) to http://server.tld/username
+ * @todo Fetch profile data from profile page for Redmatrix users
+ * @todo Detect if it is a forum
+ */
 
 require_once('include/datetime.php');
 require_once("include/Scrape.php");
-
-/*
- To-Do:
- - noscrape for updating contact fields and "last updated"
- - use /poco/@global for discovering contacts from other servers
-*/
+require_once("include/html2bbcode.php");
+require_once("include/Contact.php");
+require_once("include/Photo.php");
 
 /*
  * poco_load
@@ -28,8 +32,6 @@ require_once("include/Scrape.php");
 
 function poco_load($cid,$uid = 0,$zcid = 0,$url = null) {
 
-       require_once("include/html2bbcode.php");
-
        $a = get_app();
 
        if($cid) {
@@ -131,22 +133,23 @@ function poco_load($cid,$uid = 0,$zcid = 0,$url = null) {
                                $keywords = implode(", ", $tag);
 
                // If you query a Friendica server for its profiles, the network has to be Friendica
-               // To-Do: It could also be a Redmatrix server
+               /// TODO It could also be a Redmatrix server
                //if ($uid == 0)
                //      $network = NETWORK_DFRN;
 
                poco_check($profile_url, $name, $network, $profile_photo, $about, $location, $gender, $keywords, $connect_url, $updated, $generation, $cid, $uid, $zcid);
 
                // Update the Friendica contacts. Diaspora is doing it via a message. (See include/diaspora.php)
-               if (($location != "") OR ($about != "") OR ($keywords != "") OR ($gender != ""))
-                       q("UPDATE `contact` SET `location` = '%s', `about` = '%s', `keywords` = '%s', `gender` = '%s'
-                               WHERE `nurl` = '%s' AND NOT `self` AND `network` = '%s'",
-                               dbesc($location),
-                               dbesc($about),
-                               dbesc($keywords),
-                               dbesc($gender),
-                               dbesc(normalise_link($profile_url)),
-                               dbesc(NETWORK_DFRN));
+               // Deactivated because we now update Friendica contacts in dfrn.php
+               //if (($location != "") OR ($about != "") OR ($keywords != "") OR ($gender != ""))
+               //      q("UPDATE `contact` SET `location` = '%s', `about` = '%s', `keywords` = '%s', `gender` = '%s'
+               //              WHERE `nurl` = '%s' AND NOT `self` AND `network` = '%s'",
+               //              dbesc($location),
+               //              dbesc($about),
+               //              dbesc($keywords),
+               //              dbesc($gender),
+               //              dbesc(normalise_link($profile_url)),
+               //              dbesc(NETWORK_DFRN));
        }
        logger("poco_load: loaded $total entries",LOGGER_DEBUG);
 
@@ -174,13 +177,27 @@ function poco_check($profile_url, $name, $network, $profile_photo, $about, $loca
        if ($profile_url == "")
                return $gcid;
 
-       $orig_updated = $updated;
+       $urlparts = parse_url($profile_url);
+       if (!isset($urlparts["scheme"]))
+               return $gcid;
+
+       if (in_array($urlparts["host"], array("www.facebook.com", "facebook.com", "twitter.com",
+                                               "identi.ca", "alpha.app.net")))
+               return $gcid;
 
        // Don't store the statusnet connector as network
        // We can't simply set this to NETWORK_OSTATUS since the connector could have fetched posts from friendica as well
        if ($network == NETWORK_STATUSNET)
                $network = "";
 
+       // Assure that there are no parameter fragments in the profile url
+       if (in_array($network, array(NETWORK_DFRN, NETWORK_DIASPORA, NETWORK_OSTATUS, "")))
+               $profile_url = clean_contact_url($profile_url);
+
+       $alternate = poco_alternate_ostatus_url($profile_url);
+
+       $orig_updated = $updated;
+
        // The global contacts should contain the original picture, not the cached one
        if (($generation != 1) AND stristr(normalise_link($profile_photo), normalise_link($a->get_baseurl()."/photo/")))
                $profile_photo = "";
@@ -197,7 +214,7 @@ function poco_check($profile_url, $name, $network, $profile_photo, $about, $loca
                );
                if(count($r)) {
                        $network = $r[0]["network"];
-                       $profile_url = $r[0]["url"];
+                       //$profile_url = $r[0]["url"];
                }
        }
 
@@ -212,21 +229,55 @@ function poco_check($profile_url, $name, $network, $profile_photo, $about, $loca
                if ($updated == "0000-00-00 00:00:00")
                        $updated = $x[0]["updated"];
 
-               $last_contact = $x[0]["last_contact"];
-               $last_failure = $x[0]["last_failure"];
+               $created = $x[0]["created"];
+               $server_url = $x[0]["server_url"];
+               $nick = $x[0]["nick"];
+               $addr = $x[0]["addr"];
+               $alias =  $x[0]["alias"];
+               $notify =  $x[0]["notify"];
        } else {
-               $last_contact = "0000-00-00 00:00:00";
-               $last_failure = "0000-00-00 00:00:00";
+               $created = "0000-00-00 00:00:00";
+               $server_url = "";
+
+               $urlparts = parse_url($profile_url);
+               $nick = end(explode("/", $urlparts["path"]));
+               $addr = "";
+               $alias = "";
+               $notify = "";
        }
 
-       if (($network == "") OR ($name == "") OR ($profile_photo == "")) {
+       if ((($network == "") OR ($name == "") OR ($addr == "") OR ($profile_photo == "") OR ($server_url == "") OR $alternate)
+               AND poco_reachable($profile_url, $server_url, $network, false)) {
                $data = probe_url($profile_url);
+
+               $orig_profile = $profile_url;
+
                $network = $data["network"];
                $name = $data["name"];
+               $nick = $data["nick"];
+               $addr = $data["addr"];
+               $alias = $data["alias"];
+               $notify = $data["notify"];
                $profile_url = $data["url"];
                $profile_photo = $data["photo"];
+               $server_url = $data["baseurl"];
+
+               if ($alternate AND ($network == NETWORK_OSTATUS)) {
+                       // Delete the old entry - if it exists
+                       $r = q("SELECT `id` FROM `gcontact` WHERE `nurl` = '%s'", dbesc(normalise_link($orig_profile)));
+                       if ($r) {
+                               q("DELETE FROM `gcontact` WHERE `nurl` = '%s'", dbesc(normalise_link($orig_profile)));
+                               q("DELETE FROM `glink` WHERE `gcid` = %d", intval($r[0]["id"]));
+                       }
+
+                       // possibly create a new entry
+                       poco_check($profile_url, $name, $network, $profile_photo, $about, $location, $gender, $keywords, $connect_url, $updated, $generation, $cid, $uid, $zcid);
+               }
        }
 
+       if ($alternate AND ($network == NETWORK_OSTATUS))
+               return $gcid;
+
        if (count($x) AND ($x[0]["network"] == "") AND ($network != "")) {
                q("UPDATE `gcontact` SET `network` = '%s' WHERE `nurl` = '%s'",
                        dbesc($network),
@@ -242,87 +293,27 @@ function poco_check($profile_url, $name, $network, $profile_photo, $about, $loca
 
        logger("profile-check generation: ".$generation." Network: ".$network." URL: ".$profile_url." name: ".$name." avatar: ".$profile_photo, LOGGER_DEBUG);
 
-       // Only fetch last update manually if it wasn't provided and enabled in the system
-       if (get_config('system','ld_discover_activity') AND ($orig_updated == "0000-00-00 00:00:00") AND poco_do_update($updated, $last_contact, $last_failure)) {
-               $last_updated = poco_last_updated($profile_url);
-               if ($last_updated) {
-                       $updated = $last_updated;
-                       $last_contact = datetime_convert();
-                       logger("Last updated for profile ".$profile_url.": ".$updated, LOGGER_DEBUG);
-
-                       if (count($x))
-                               q("UPDATE `gcontact` SET `last_contact` = '%s' WHERE `nurl` = '%s'", dbesc($last_contact), dbesc(normalise_link($profile_url)));
-               } else {
-                       $last_failure = datetime_convert();
-
-                       if (count($x))
-                               q("UPDATE `gcontact` SET `last_failure` = '%s' WHERE `nurl` = '%s'", dbesc($last_failure), dbesc(normalise_link($profile_url)));
-               }
-       }
-
-       if(count($x)) {
-               $gcid = $x[0]['id'];
-
-               if (($location == "") AND ($x[0]['location'] != ""))
-                       $location = $x[0]['location'];
-
-               if (($about == "") AND ($x[0]['about'] != ""))
-                       $about = $x[0]['about'];
-
-               if (($gender == "") AND ($x[0]['gender'] != ""))
-                       $gender = $x[0]['gender'];
-
-               if (($keywords == "") AND ($x[0]['keywords'] != ""))
-                       $keywords = $x[0]['keywords'];
-
-               if (($generation == 0) AND ($x[0]['generation'] > 0))
-                       $generation = $x[0]['generation'];
-
-               if($x[0]['name'] != $name || $x[0]['photo'] != $profile_photo || $x[0]['updated'] < $updated) {
-                       q("UPDATE `gcontact` SET `name` = '%s', `network` = '%s', `photo` = '%s', `connect` = '%s', `url` = '%s',
-                               `updated` = '%s', `location` = '%s', `about` = '%s', `keywords` = '%s', `gender` = '%s', `generation` = %d
-                               WHERE (`generation` >= %d OR `generation` = 0) AND `nurl` = '%s'",
-                               dbesc($name),
-                               dbesc($network),
-                               dbesc($profile_photo),
-                               dbesc($connect_url),
-                               dbesc($profile_url),
-                               dbesc($updated),
-                               dbesc($location),
-                               dbesc($about),
-                               dbesc($keywords),
-                               dbesc($gender),
-                               intval($generation),
-                               intval($generation),
-                               dbesc(normalise_link($profile_url))
-                       );
-               }
-       } else {
-               q("INSERT INTO `gcontact` (`name`,`network`, `url`,`nurl`,`photo`,`connect`, `updated`, `last_contact`, `last_failure`, `location`, `about`, `keywords`, `gender`, `generation`)
-                       VALUES ('%s', '%s', '%s', '%s', '%s','%s', '%s', '%s', '%s', '%s', '%s', %d)",
-                       dbesc($name),
-                       dbesc($network),
-                       dbesc($profile_url),
-                       dbesc(normalise_link($profile_url)),
-                       dbesc($profile_photo),
-                       dbesc($connect_url),
-                       dbesc($updated),
-                       dbesc($last_contact),
-                       dbesc($last_failure),
-                       dbesc($location),
-                       dbesc($about),
-                       dbesc($keywords),
-                       dbesc($gender),
-                       intval($generation)
-               );
-               $x = q("SELECT * FROM `gcontact` WHERE `nurl` = '%s' LIMIT 1",
-                       dbesc(normalise_link($profile_url))
-               );
-               if(count($x))
-                       $gcid = $x[0]['id'];
-       }
-
-       if(! $gcid)
+       poco_check_server($server_url, $network);
+
+       $gcontact = array("url" => $profile_url,
+                       "addr" => $addr,
+                       "alias" => $alias,
+                       "name" => $name,
+                       "network" => $network,
+                       "photo" => $profile_photo,
+                       "about" => $about,
+                       "location" => $location,
+                       "gender" => $gender,
+                       "keywords" => $keywords,
+                       "server_url" => $server_url,
+                       "connect" => $connect_url,
+                       "notify" => $notify,
+                       "updated" => $updated,
+                       "generation" => $generation);
+
+       $gcid = update_gcontact($gcontact);
+
+       if(!$gcid)
                return $gcid;
 
        $r = q("SELECT * FROM `glink` WHERE `cid` = %d AND `uid` = %d AND `gcid` = %d AND `zcid` = %d LIMIT 1",
@@ -349,28 +340,235 @@ function poco_check($profile_url, $name, $network, $profile_photo, $about, $loca
                );
        }
 
-       // For unknown reasons there are sometimes duplicates
-       q("DELETE FROM `gcontact` WHERE `nurl` = '%s' AND `id` != %d AND
-               NOT EXISTS (SELECT `gcid` FROM `glink` WHERE `gcid` = `gcontact`.`id`)",
-               dbesc(normalise_link($profile_url)),
-               intval($gcid)
-       );
-
        return $gcid;
 }
 
-function poco_last_updated($profile) {
+function poco_reachable($profile, $server = "", $network = "", $force = false) {
+
+       if ($server == "")
+               $server = poco_detect_server($profile);
+
+       if ($server == "")
+               return true;
+
+       return poco_check_server($server, $network, $force);
+}
+
+function poco_detect_server($profile) {
+
+       // Try to detect the server path based upon some known standard paths
+       $server_url = "";
+
+       if ($server_url == "") {
+               $friendica = preg_replace("=(https?://)(.*)/profile/(.*)=ism", "$1$2", $profile);
+               if ($friendica != $profile) {
+                       $server_url = $friendica;
+                       $network = NETWORK_DFRN;
+               }
+       }
+
+       if ($server_url == "") {
+               $diaspora = preg_replace("=(https?://)(.*)/u/(.*)=ism", "$1$2", $profile);
+               if ($diaspora != $profile) {
+                       $server_url = $diaspora;
+                       $network = NETWORK_DIASPORA;
+               }
+       }
+
+       if ($server_url == "") {
+               $red = preg_replace("=(https?://)(.*)/channel/(.*)=ism", "$1$2", $profile);
+               if ($red != $profile) {
+                       $server_url = $red;
+                       $network = NETWORK_DIASPORA;
+               }
+       }
+
+       return $server_url;
+}
+
+function poco_alternate_ostatus_url($url) {
+       return(preg_match("=https?://.+/user/\d+=ism", $url, $matches));
+}
+
+function poco_last_updated($profile, $force = false) {
+
+       $gcontacts = q("SELECT * FROM `gcontact` WHERE `nurl` = '%s'",
+                       dbesc(normalise_link($profile)));
+
+       if ($gcontacts[0]["created"] == "0000-00-00 00:00:00")
+               q("UPDATE `gcontact` SET `created` = '%s' WHERE `nurl` = '%s'",
+                       dbesc(datetime_convert()), dbesc(normalise_link($profile)));
+
+       if ($gcontacts[0]["server_url"] != "")
+               $server_url = $gcontacts[0]["server_url"];
+       else
+               $server_url = poco_detect_server($profile);
+
+       if (!in_array($gcontacts[0]["network"], array(NETWORK_DFRN, NETWORK_DIASPORA, NETWORK_FEED, NETWORK_OSTATUS, ""))) {
+               logger("Profile ".$profile.": Network type ".$gcontacts[0]["network"]." can't be checked", LOGGER_DEBUG);
+               return false;
+       }
+
+       if ($server_url != "") {
+               if (!poco_check_server($server_url, $gcontacts[0]["network"], $force)) {
+
+                       if ($force)
+                               q("UPDATE `gcontact` SET `last_failure` = '%s' WHERE `nurl` = '%s'",
+                                       dbesc(datetime_convert()), dbesc(normalise_link($profile)));
+
+                       logger("Profile ".$profile.": Server ".$server_url." wasn't reachable.", LOGGER_DEBUG);
+                       return false;
+               }
+
+               q("UPDATE `gcontact` SET `server_url` = '%s' WHERE `nurl` = '%s'",
+                       dbesc($server_url), dbesc(normalise_link($profile)));
+       }
+
+       if (in_array($gcontacts[0]["network"], array("", NETWORK_FEED))) {
+               $server = q("SELECT `network` FROM `gserver` WHERE `nurl` = '%s' AND `network` != ''",
+                       dbesc(normalise_link($server_url)));
+
+               if ($server)
+                       q("UPDATE `gcontact` SET `network` = '%s' WHERE `nurl` = '%s'",
+                               dbesc($server[0]["network"]), dbesc(normalise_link($profile)));
+               else
+                       return false;
+       }
+
+       // noscrape is really fast so we don't cache the call.
+       if (($gcontacts[0]["server_url"] != "") AND ($gcontacts[0]["nick"] != "")) {
+
+               //  Use noscrape if possible
+               $server = q("SELECT `noscrape`, `network` FROM `gserver` WHERE `nurl` = '%s' AND `noscrape` != ''", dbesc(normalise_link($gcontacts[0]["server_url"])));
+
+               if ($server) {
+                       $noscraperet = z_fetch_url($server[0]["noscrape"]."/".$gcontacts[0]["nick"]);
+
+                        if ($noscraperet["success"] AND ($noscraperet["body"] != "")) {
+
+                               $noscrape = json_decode($noscraperet["body"], true);
+
+                               if (is_array($noscrape)) {
+                                       $contact = array("url" => $profile,
+                                                       "network" => $server[0]["network"],
+                                                       "generation" => $gcontacts[0]["generation"]);
+
+                                       if (isset($noscrape["fn"]))
+                                               $contact["name"] = $noscrape["fn"];
+
+                                       if (isset($noscrape["comm"]))
+                                               $contact["community"] = $noscrape["comm"];
+
+                                       if (isset($noscrape["tags"])) {
+                                               $keywords = implode(" ", $noscrape["tags"]);
+                                               if ($keywords != "")
+                                                       $contact["keywords"] = $keywords;
+                                       }
+
+                                       $location = formatted_location($noscrape);
+                                       if ($location)
+                                               $contact["location"] = $location;
+
+                                       if (isset($noscrape["dfrn-notify"]))
+                                               $contact["notify"] = $noscrape["dfrn-notify"];
+
+                                       // Remove all fields that are not present in the gcontact table
+                                       unset($noscrape["fn"]);
+                                       unset($noscrape["key"]);
+                                       unset($noscrape["homepage"]);
+                                       unset($noscrape["comm"]);
+                                       unset($noscrape["tags"]);
+                                       unset($noscrape["locality"]);
+                                       unset($noscrape["region"]);
+                                       unset($noscrape["country-name"]);
+                                       unset($noscrape["contacts"]);
+                                       unset($noscrape["dfrn-request"]);
+                                       unset($noscrape["dfrn-confirm"]);
+                                       unset($noscrape["dfrn-notify"]);
+                                       unset($noscrape["dfrn-poll"]);
+
+                                       // Set the date of the last contact
+                                       /// @todo By now the function "update_gcontact" doesn't work with this field
+                                       //$contact["last_contact"] = datetime_convert();
+
+                                       $contact = array_merge($contact, $noscrape);
+
+                                       update_gcontact($contact);
+
+                                       if (trim($noscrape["updated"]) != "") {
+                                               q("UPDATE `gcontact` SET `last_contact` = '%s' WHERE `nurl` = '%s'",
+                                                       dbesc(datetime_convert()), dbesc(normalise_link($profile)));
+
+                                               logger("Profile ".$profile." was last updated at ".$noscrape["updated"]." (noscrape)", LOGGER_DEBUG);
+
+                                               return $noscrape["updated"];
+                                       }
+                               }
+                       }
+               }
+       }
+
+       // If we only can poll the feed, then we only do this once a while
+       if (!$force AND !poco_do_update($gcontacts[0]["created"], $gcontacts[0]["updated"], $gcontacts[0]["last_failure"],  $gcontacts[0]["last_contact"])) {
+               logger("Profile ".$profile." was last updated at ".$gcontacts[0]["updated"]." (cached)", LOGGER_DEBUG);
+               return $gcontacts[0]["updated"];
+       }
+
        $data = probe_url($profile);
 
-       if (($data["poll"] == "") OR ($data["network"] == NETWORK_FEED))
+       // Is the profile link the alternate OStatus link notation? (http://domain.tld/user/4711)
+       // Then check the other link and delete this one
+       if (($data["network"] == NETWORK_OSTATUS) AND poco_alternate_ostatus_url($profile) AND
+               (normalise_link($profile) == normalise_link($data["alias"])) AND
+               (normalise_link($profile) != normalise_link($data["url"]))) {
+
+               // Delete the old entry
+               q("DELETE FROM `gcontact` WHERE `nurl` = '%s'", dbesc(normalise_link($profile)));
+               q("DELETE FROM `glink` WHERE `gcid` = %d", intval($gcontacts[0]["id"]));
+
+               poco_check($data["url"], $data["name"], $data["network"], $data["photo"], $gcontacts[0]["about"], $gcontacts[0]["location"],
+                               $gcontacts[0]["gender"], $gcontacts[0]["keywords"], $data["addr"], $gcontacts[0]["updated"], $gcontacts[0]["generation"]);
+
+               poco_last_updated($data["url"], $force);
+
+               logger("Profile ".$profile." was deleted", LOGGER_DEBUG);
                return false;
+       }
 
-       // To-Do: Use noscrape
+       if (($data["poll"] == "") OR (in_array($data["network"], array(NETWORK_FEED, NETWORK_PHANTOM)))) {
+               q("UPDATE `gcontact` SET `last_failure` = '%s' WHERE `nurl` = '%s'",
+                       dbesc(datetime_convert()), dbesc(normalise_link($profile)));
+
+               logger("Profile ".$profile." wasn't reachable (profile)", LOGGER_DEBUG);
+               return false;
+       }
+
+       $contact = array("generation" => $gcontacts[0]["generation"]);
+
+       $contact = array_merge($contact, $data);
+
+       $contact["server_url"] = $data["baseurl"];
+
+       unset($contact["batch"]);
+       unset($contact["poll"]);
+       unset($contact["request"]);
+       unset($contact["confirm"]);
+       unset($contact["poco"]);
+       unset($contact["priority"]);
+       unset($contact["pubkey"]);
+       unset($contact["baseurl"]);
+
+       update_gcontact($contact);
 
        $feedret = z_fetch_url($data["poll"]);
 
-       if (!$feedret["success"])
+       if (!$feedret["success"]) {
+               q("UPDATE `gcontact` SET `last_failure` = '%s' WHERE `nurl` = '%s'",
+                       dbesc(datetime_convert()), dbesc(normalise_link($profile)));
+
+               logger("Profile ".$profile." wasn't reachable (no feed)", LOGGER_DEBUG);
                return false;
+       }
 
        $doc = new DOMDocument();
        @$doc->loadXML($feedret["body"]);
@@ -398,10 +596,19 @@ function poco_last_updated($profile) {
                if ($xpath->query('/atom:feed')->length > 0)
                        $last_updated = "0000-00-00 00:00:00";
 
+       q("UPDATE `gcontact` SET `updated` = '%s', `last_contact` = '%s' WHERE `nurl` = '%s'",
+               dbesc($last_updated), dbesc(datetime_convert()), dbesc(normalise_link($profile)));
+
+       if (($gcontacts[0]["generation"] == 0))
+               q("UPDATE `gcontact` SET `generation` = 9 WHERE `nurl` = '%s'",
+                       dbesc(normalise_link($profile)));
+
+       logger("Profile ".$profile." was last updated at ".$last_updated, LOGGER_DEBUG);
+
        return($last_updated);
 }
 
-function poco_do_update($updated, $last_contact, $last_failure) {
+function poco_do_update($created, $updated, $last_failure,  $last_contact) {
        $now = strtotime(datetime_convert());
 
        if ($updated > $last_contact)
@@ -410,6 +617,11 @@ function poco_do_update($updated, $last_contact, $last_failure) {
                $contact_time = strtotime($last_contact);
 
        $failure_time = strtotime($last_failure);
+       $created_time = strtotime($created);
+
+       // If there is no "created" time then use the current time
+       if ($created_time <= 0)
+               $created_time = $now;
 
        // If the last contact was less than 24 hours then don't update
        if (($now - $contact_time) < (60 * 60 * 24))
@@ -420,115 +632,326 @@ function poco_do_update($updated, $last_contact, $last_failure) {
                return false;
 
        // If the last contact was less than a week ago and the last failure is older than a week then don't update
-       if ((($now - $contact_time) < (60 * 60 * 24 * 7)) AND ($contact_time > $failure_time))
-               return false;
+       //if ((($now - $contact_time) < (60 * 60 * 24 * 7)) AND ($contact_time > $failure_time))
+       //      return false;
 
-       // If the last contact time was more than a week ago, then only try once a week
-       if (($now - $contact_time) > (60 * 60 * 24 * 7) AND ($now - $failure_time) < (60 * 60 * 24 * 7))
+       // If the last contact time was more than a week ago and the contact was created more than a week ago, then only try once a week
+       if ((($now - $contact_time) > (60 * 60 * 24 * 7)) AND (($now - $created_time) > (60 * 60 * 24 * 7)) AND (($now - $failure_time) < (60 * 60 * 24 * 7)))
                return false;
 
-       // If the last contact time was more than a month ago, then only try once a month
-       if (($now - $contact_time) > (60 * 60 * 24 * 30) AND ($now - $failure_time) < (60 * 60 * 24 * 30))
+       // If the last contact time was more than a month ago and the contact was created more than a month ago, then only try once a month
+       if ((($now - $contact_time) > (60 * 60 * 24 * 30)) AND (($now - $created_time) > (60 * 60 * 24 * 30)) AND (($now - $failure_time) < (60 * 60 * 24 * 30)))
                return false;
 
        return true;
 }
 
-function poco_contact_from_body($body, $created, $cid, $uid) {
-       preg_replace_callback("/\[share(.*?)\].*?\[\/share\]/ism",
-               function ($match) use ($created, $cid, $uid){
-                       return(sub_poco_from_share($match, $created, $cid, $uid));
-               }, $body);
+function poco_to_boolean($val) {
+       if (($val == "true") OR ($val == 1))
+               return(true);
+       if (($val == "false") OR ($val == 0))
+               return(false);
+
+       return ($val);
 }
 
-function sub_poco_from_share($share, $created, $cid, $uid) {
-       $profile = "";
-       preg_match("/profile='(.*?)'/ism", $share[1], $matches);
-       if ($matches[1] != "")
-               $profile = $matches[1];
+function poco_check_server($server_url, $network = "", $force = false) {
 
-       preg_match('/profile="(.*?)"/ism', $share[1], $matches);
-       if ($matches[1] != "")
-               $profile = $matches[1];
+       // Unify the server address
+       $server_url = trim($server_url, "/");
+       $server_url = str_replace("/index.php", "", $server_url);
 
-       if ($profile == "")
-               return;
+       if ($server_url == "")
+               return false;
 
-       logger("prepare poco_check for profile ".$profile, LOGGER_DEBUG);
-       poco_check($profile, "", "", "", "", "", "", "", "", $created, 3, $cid, $uid);
-}
+       $servers = q("SELECT * FROM `gserver` WHERE `nurl` = '%s'", dbesc(normalise_link($server_url)));
+       if ($servers) {
 
-function poco_store($item) {
+               if ($servers[0]["created"] == "0000-00-00 00:00:00")
+                       q("UPDATE `gserver` SET `created` = '%s' WHERE `nurl` = '%s'",
+                               dbesc(datetime_convert()), dbesc(normalise_link($server_url)));
 
-       // Isn't it public?
-       if ($item['private'])
-               return;
+               $poco = $servers[0]["poco"];
+               $noscrape = $servers[0]["noscrape"];
 
-       // Or is it from a network where we don't store the global contacts?
-       if (!in_array($item["network"], array(NETWORK_DFRN, NETWORK_DIASPORA, NETWORK_OSTATUS, NETWORK_STATUSNET, "")))
-               return;
+               if ($network == "")
+                       $network = $servers[0]["network"];
 
-       // Is it a global copy?
-       $store_gcontact = ($item["uid"] == 0);
+               $last_contact = $servers[0]["last_contact"];
+               $last_failure = $servers[0]["last_failure"];
+               $version = $servers[0]["version"];
+               $platform = $servers[0]["platform"];
+               $site_name = $servers[0]["site_name"];
+               $info = $servers[0]["info"];
+               $register_policy = $servers[0]["register_policy"];
 
-       // Is it a comment on a global copy?
-       if (!$store_gcontact AND ($item["uri"] != $item["parent-uri"])) {
-               $q = q("SELECT `id` FROM `item` WHERE `uri`='%s' AND `uid` = 0", $item["parent-uri"]);
-               $store_gcontact = count($q);
+               if (!$force AND !poco_do_update($servers[0]["created"], "", $last_failure, $last_contact)) {
+                       logger("Use cached data for server ".$server_url, LOGGER_DEBUG);
+                       return ($last_contact >= $last_failure);
+               }
+       } else {
+               $poco = "";
+               $noscrape = "";
+               $version = "";
+               $platform = "";
+               $site_name = "";
+               $info = "";
+               $register_policy = -1;
+
+               $last_contact = "0000-00-00 00:00:00";
+               $last_failure = "0000-00-00 00:00:00";
        }
+       logger("Server ".$server_url." is outdated or unknown. Start discovery. Force: ".$force." Created: ".$servers[0]["created"]." Failure: ".$last_failure." Contact: ".$last_contact, LOGGER_DEBUG);
 
-       if (!$store_gcontact)
-               return;
+       $failure = false;
+       $orig_last_failure = $last_failure;
+
+       // Check if the page is accessible via SSL.
+       $server_url = str_replace("http://", "https://", $server_url);
+       $serverret = z_fetch_url($server_url."/.well-known/host-meta");
+
+       // Maybe the page is unencrypted only?
+       $xmlobj = @simplexml_load_string($serverret["body"],'SimpleXMLElement',0, "http://docs.oasis-open.org/ns/xri/xrd-1.0");
+       if (!$serverret["success"] OR ($serverret["body"] == "") OR (@sizeof($xmlobj) == 0) OR !is_object($xmlobj)) {
+               $server_url = str_replace("https://", "http://", $server_url);
+               $serverret = z_fetch_url($server_url."/.well-known/host-meta");
+
+               $xmlobj = @simplexml_load_string($serverret["body"],'SimpleXMLElement',0, "http://docs.oasis-open.org/ns/xri/xrd-1.0");
+       }
+
+       if (!$serverret["success"] OR ($serverret["body"] == "") OR (sizeof($xmlobj) == 0) OR !is_object($xmlobj)) {
+               // Workaround for bad configured servers (known nginx problem)
+               if ($serverret["debug"]["http_code"] != "403") {
+                       $last_failure = datetime_convert();
+                       $failure = true;
+               }
+       } elseif ($network == NETWORK_DIASPORA)
+               $last_contact = datetime_convert();
+
+       if (!$failure) {
+               // Test for Diaspora
+               $serverret = z_fetch_url($server_url);
+
+               if (!$serverret["success"] OR ($serverret["body"] == ""))
+                       $failure = true;
+               else {
+                       $lines = explode("\n",$serverret["header"]);
+                       if(count($lines))
+                               foreach($lines as $line) {
+                                       $line = trim($line);
+                                       if(stristr($line,'X-Diaspora-Version:')) {
+                                               $platform = "Diaspora";
+                                               $version = trim(str_replace("X-Diaspora-Version:", "", $line));
+                                               $version = trim(str_replace("x-diaspora-version:", "", $version));
+                                               $network = NETWORK_DIASPORA;
+                                               $versionparts = explode("-", $version);
+                                               $version = $versionparts[0];
+                                       }
+                               }
+               }
+       }
+
+       if (!$failure) {
+               // Test for Statusnet
+               // Will also return data for Friendica and GNU Social - but it will be overwritten later
+               // The "not implemented" is a special treatment for really, really old Friendica versions
+               $serverret = z_fetch_url($server_url."/api/statusnet/version.json");
+               if ($serverret["success"] AND ($serverret["body"] != '{"error":"not implemented"}') AND
+                       ($serverret["body"] != '') AND (strlen($serverret["body"]) < 30)) {
+                       $platform = "StatusNet";
+                       $version = trim($serverret["body"], '"');
+                       $network = NETWORK_OSTATUS;
+               }
+
+               // Test for GNU Social
+               $serverret = z_fetch_url($server_url."/api/gnusocial/version.json");
+               if ($serverret["success"] AND ($serverret["body"] != '{"error":"not implemented"}') AND
+                       ($serverret["body"] != '') AND (strlen($serverret["body"]) < 30)) {
+                       $platform = "GNU Social";
+                       $version = trim($serverret["body"], '"');
+                       $network = NETWORK_OSTATUS;
+               }
+
+               $serverret = z_fetch_url($server_url."/api/statusnet/config.json");
+               if ($serverret["success"]) {
+                       $data = json_decode($serverret["body"]);
+
+                       if (isset($data->site->server)) {
+                               $last_contact = datetime_convert();
+
+                               if (isset($data->site->hubzilla)) {
+                                       $platform = $data->site->hubzilla->PLATFORM_NAME;
+                                       $version = $data->site->hubzilla->RED_VERSION;
+                                       $network = NETWORK_DIASPORA;
+                               }
+                               if (isset($data->site->redmatrix)) {
+                                       if (isset($data->site->redmatrix->PLATFORM_NAME))
+                                               $platform = $data->site->redmatrix->PLATFORM_NAME;
+                                       elseif (isset($data->site->redmatrix->RED_PLATFORM))
+                                               $platform = $data->site->redmatrix->RED_PLATFORM;
+
+                                       $version = $data->site->redmatrix->RED_VERSION;
+                                       $network = NETWORK_DIASPORA;
+                               }
+                               if (isset($data->site->friendica)) {
+                                       $platform = $data->site->friendica->FRIENDICA_PLATFORM;
+                                       $version = $data->site->friendica->FRIENDICA_VERSION;
+                                       $network = NETWORK_DFRN;
+                               }
+
+                               $site_name = $data->site->name;
+
+                               $data->site->closed = poco_to_boolean($data->site->closed);
+                               $data->site->private = poco_to_boolean($data->site->private);
+                               $data->site->inviteonly = poco_to_boolean($data->site->inviteonly);
+
+                               if (!$data->site->closed AND !$data->site->private and $data->site->inviteonly)
+                                       $register_policy = REGISTER_APPROVE;
+                               elseif (!$data->site->closed AND !$data->site->private)
+                                       $register_policy = REGISTER_OPEN;
+                               else
+                                       $register_policy = REGISTER_CLOSED;
+                       }
+               }
+       }
+
+       // Query statistics.json. Optional package for Diaspora, Friendica and Redmatrix
+       if (!$failure) {
+               $serverret = z_fetch_url($server_url."/statistics.json");
+               if ($serverret["success"]) {
+                       $data = json_decode($serverret["body"]);
+                       if ($version == "")
+                               $version = $data->version;
+
+                       $site_name = $data->name;
+
+                       if (isset($data->network) AND ($platform == ""))
+                               $platform = $data->network;
 
-       // "3" means: We don't know this contact directly (Maybe a reshared item)
-       $generation = 3;
-       $network = "";
-       $profile_url = $item["author-link"];
-
-       // Is it a user from our server?
-       $q = q("SELECT `id` FROM `contact` WHERE `self` AND `nurl` = '%s' LIMIT 1",
-               dbesc(normalise_link($item["author-link"])));
-       if (count($q)) {
-               logger("Our user (generation 1): ".$item["author-link"], LOGGER_DEBUG);
-               $generation = 1;
-               $network = NETWORK_DFRN;
-       } else { // Is it a contact from a user on our server?
-               $q = q("SELECT `network`, `url` FROM `contact` WHERE `uid` != 0 AND `network` != ''
-                       AND (`nurl` = '%s' OR `alias` IN ('%s', '%s')) AND `network` != '%s' LIMIT 1",
-                       dbesc(normalise_link($item["author-link"])),
-                       dbesc(normalise_link($item["author-link"])),
-                       dbesc($item["author-link"]),
-                       dbesc(NETWORK_STATUSNET));
-               if (count($q)) {
-                       $generation = 2;
-                       $network = $q[0]["network"];
-                       $profile_url = $q[0]["url"];
-                       logger("Known contact (generation 2): ".$profile_url, LOGGER_DEBUG);
-               }
-       }
-
-       if ($generation == 3)
-               logger("Unknown contact (generation 3): ".$item["author-link"], LOGGER_DEBUG);
-
-       poco_check($profile_url, $item["author-name"], $network, $item["author-avatar"], "", "", "", "", "", $item["received"], $generation, $item["contact-id"], $item["uid"]);
-
-       // Maybe its a body with a shared item? Then extract a global contact from it.
-       poco_contact_from_body($item["body"], $item["received"], $item["contact-id"], $item["uid"]);
+                       if ($platform == "Diaspora")
+                               $network = NETWORK_DIASPORA;
+
+                       if ($data->registrations_open)
+                               $register_policy = REGISTER_OPEN;
+                       else
+                               $register_policy = REGISTER_CLOSED;
+
+                       if (isset($data->version))
+                               $last_contact = datetime_convert();
+               }
+       }
+
+       // Check for noscrape
+       // Friendica servers could be detected as OStatus servers
+       if (!$failure AND in_array($network, array(NETWORK_DFRN, NETWORK_OSTATUS))) {
+               $serverret = z_fetch_url($server_url."/friendica/json");
+
+               if (!$serverret["success"])
+                       $serverret = z_fetch_url($server_url."/friendika/json");
+
+               if ($serverret["success"]) {
+                       $data = json_decode($serverret["body"]);
+
+                       if (isset($data->version)) {
+                               $last_contact = datetime_convert();
+                               $network = NETWORK_DFRN;
+
+                               $noscrape = $data->no_scrape_url;
+                               $version = $data->version;
+                               $site_name = $data->site_name;
+                               $info = $data->info;
+                               $register_policy_str = $data->register_policy;
+                               $platform = $data->platform;
+
+                               switch ($register_policy_str) {
+                                       case "REGISTER_CLOSED":
+                                               $register_policy = REGISTER_CLOSED;
+                                               break;
+                                       case "REGISTER_APPROVE":
+                                               $register_policy = REGISTER_APPROVE;
+                                               break;
+                                       case "REGISTER_OPEN":
+                                               $register_policy = REGISTER_OPEN;
+                                               break;
+                               }
+                       }
+               }
+       }
+
+       // Look for poco
+       if (!$failure) {
+               $serverret = z_fetch_url($server_url."/poco");
+               if ($serverret["success"]) {
+                       $data = json_decode($serverret["body"]);
+                       if (isset($data->totalResults)) {
+                               $poco = $server_url."/poco";
+                               $last_contact = datetime_convert();
+                       }
+               }
+       }
+
+       // Check again if the server exists
+       $servers = q("SELECT `nurl` FROM `gserver` WHERE `nurl` = '%s'", dbesc(normalise_link($server_url)));
+
+       $version = strip_tags($version);
+       $site_name = strip_tags($site_name);
+       $info = strip_tags($info);
+       $platform = strip_tags($platform);
+
+       if ($servers)
+                q("UPDATE `gserver` SET `url` = '%s', `version` = '%s', `site_name` = '%s', `info` = '%s', `register_policy` = %d, `poco` = '%s', `noscrape` = '%s',
+                       `network` = '%s', `platform` = '%s', `last_contact` = '%s', `last_failure` = '%s' WHERE `nurl` = '%s'",
+                       dbesc($server_url),
+                       dbesc($version),
+                       dbesc($site_name),
+                       dbesc($info),
+                       intval($register_policy),
+                       dbesc($poco),
+                       dbesc($noscrape),
+                       dbesc($network),
+                       dbesc($platform),
+                       dbesc($last_contact),
+                       dbesc($last_failure),
+                       dbesc(normalise_link($server_url))
+               );
+       else
+               q("INSERT INTO `gserver` (`url`, `nurl`, `version`, `site_name`, `info`, `register_policy`, `poco`, `noscrape`, `network`, `platform`, `created`, `last_contact`, `last_failure`)
+                                       VALUES ('%s', '%s', '%s', '%s', '%s', %d, '%s', '%s', '%s', '%s', '%s', '%s', '%s')",
+                               dbesc($server_url),
+                               dbesc(normalise_link($server_url)),
+                               dbesc($version),
+                               dbesc($site_name),
+                               dbesc($info),
+                               intval($register_policy),
+                               dbesc($poco),
+                               dbesc($noscrape),
+                               dbesc($network),
+                               dbesc($platform),
+                               dbesc(datetime_convert()),
+                               dbesc($last_contact),
+                               dbesc($last_failure),
+                               dbesc(datetime_convert())
+               );
+
+       logger("End discovery for server ".$server_url, LOGGER_DEBUG);
+
+       return !$failure;
 }
 
 function count_common_friends($uid,$cid) {
 
        $r = q("SELECT count(*) as `total`
                FROM `glink` INNER JOIN `gcontact` on `glink`.`gcid` = `gcontact`.`id`
-               where `glink`.`cid` = %d and `glink`.`uid` = %d
-               and `gcontact`.`nurl` in (select nurl from contact where uid = %d and self = 0 and blocked = 0 and hidden = 0 and id != %d ) ",
+               WHERE `glink`.`cid` = %d AND `glink`.`uid` = %d AND
+               ((`gcontact`.`last_contact` >= `gcontact`.`last_failure`) OR (`gcontact`.`updated` >= `gcontact`.`last_failure`))
+               AND `gcontact`.`nurl` IN (select nurl from contact where uid = %d and self = 0 and blocked = 0 and hidden = 0 and id != %d ) ",
                intval($cid),
                intval($uid),
                intval($uid),
                intval($cid)
        );
 
-//     logger("count_common_friends: $uid $cid {$r[0]['total']}"); 
+//     logger("count_common_friends: $uid $cid {$r[0]['total']}");
        if(count($r))
                return $r[0]['total'];
        return 0;
@@ -543,11 +966,15 @@ function common_friends($uid,$cid,$start = 0,$limit=9999,$shuffle = false) {
        else
                $sql_extra = " order by `gcontact`.`name` asc ";
 
-       $r = q("SELECT `gcontact`.*
-               FROM `glink` INNER JOIN `gcontact` on `glink`.`gcid` = `gcontact`.`id`
-               where `glink`.`cid` = %d and `glink`.`uid` = %d
-               and `gcontact`.`nurl` in (select nurl from contact where uid = %d and self = 0 and blocked = 0 and hidden = 0 and id != %d ) 
-               $sql_extra limit %d, %d",
+       $r = q("SELECT `gcontact`.*, `contact`.`id` AS `cid`
+               FROM `glink`
+               INNER JOIN `gcontact` ON `glink`.`gcid` = `gcontact`.`id`
+               INNER JOIN `contact` ON `gcontact`.`nurl` = `contact`.`nurl`
+               WHERE `glink`.`cid` = %d and `glink`.`uid` = %d
+                       AND `contact`.`uid` = %d AND `contact`.`self` = 0 AND `contact`.`blocked` = 0
+                       AND `contact`.`hidden` = 0 AND `contact`.`id` != %d
+                       AND ((`gcontact`.`last_contact` >= `gcontact`.`last_failure`) OR (`gcontact`.`updated` >= `gcontact`.`last_failure`))
+                       $sql_extra LIMIT %d, %d",
                intval($cid),
                intval($uid),
                intval($uid),
@@ -604,7 +1031,8 @@ function count_all_friends($uid,$cid) {
 
        $r = q("SELECT count(*) as `total`
                FROM `glink` INNER JOIN `gcontact` on `glink`.`gcid` = `gcontact`.`id`
-               where `glink`.`cid` = %d and `glink`.`uid` = %d ",
+               where `glink`.`cid` = %d and `glink`.`uid` = %d AND
+               ((`gcontact`.`last_contact` >= `gcontact`.`last_failure`) OR (`gcontact`.`updated` >= `gcontact`.`last_failure`))",
                intval($cid),
                intval($uid)
        );
@@ -618,10 +1046,14 @@ function count_all_friends($uid,$cid) {
 
 function all_friends($uid,$cid,$start = 0, $limit = 80) {
 
-       $r = q("SELECT `gcontact`.*
-               FROM `glink` INNER JOIN `gcontact` on `glink`.`gcid` = `gcontact`.`id`
-               where `glink`.`cid` = %d and `glink`.`uid` = %d
-               order by `gcontact`.`name` asc LIMIT %d, %d ",
+       $r = q("SELECT `gcontact`.*, `contact`.`id` AS `cid`
+               FROM `glink`
+               INNER JOIN `gcontact` on `glink`.`gcid` = `gcontact`.`id`
+               LEFT JOIN `contact` ON `contact`.`nurl` = `gcontact`.`nurl` AND `contact`.`uid` = %d
+               WHERE `glink`.`cid` = %d AND `glink`.`uid` = %d AND
+               ((`gcontact`.`last_contact` >= `gcontact`.`last_failure`) OR (`gcontact`.`updated` >= `gcontact`.`last_failure`))
+               ORDER BY `gcontact`.`name` ASC LIMIT %d, %d ",
+               intval($uid),
                intval($cid),
                intval($uid),
                intval($start),
@@ -651,14 +1083,14 @@ function suggestion_query($uid, $start = 0, $limit = 80) {
        $sql_network = "'".$sql_network."'";
 
        $r = q("SELECT count(glink.gcid) as `total`, gcontact.* from gcontact
-               INNER JOIN glink on glink.gcid = gcontact.id
+               INNER JOIN `glink` ON `glink`.`gcid` = `gcontact`.`id`
                where uid = %d and not gcontact.nurl in ( select nurl from contact where uid = %d )
-               and not gcontact.name in ( select name from contact where uid = %d )
-               and not gcontact.id in ( select gcid from gcign where uid = %d )
+               AND NOT `gcontact`.`name` IN (SELECT `name` FROM `contact` WHERE `uid` = %d)
+               AND NOT `gcontact`.`id` IN (SELECT `gcid` FROM `gcign` WHERE `uid` = %d)
                AND `gcontact`.`updated` != '0000-00-00 00:00:00'
                AND `gcontact`.`last_contact` >= `gcontact`.`last_failure`
                AND `gcontact`.`network` IN (%s)
-               group by glink.gcid order by gcontact.updated desc,total desc limit %d, %d ",
+               GROUP BY `glink`.`gcid` ORDER BY `gcontact`.`updated` DESC,`total` DESC LIMIT %d, %d",
                intval($uid),
                intval($uid),
                intval($uid),
@@ -671,14 +1103,15 @@ function suggestion_query($uid, $start = 0, $limit = 80) {
        if(count($r) && count($r) >= ($limit -1))
                return $r;
 
-       $r2 = q("SELECT gcontact.* from gcontact
-               INNER JOIN glink on glink.gcid = gcontact.id
-               where glink.uid = 0 and glink.cid = 0 and glink.zcid = 0 and not gcontact.nurl in ( select nurl from contact where uid = %d )
-               and not gcontact.name in ( select name from contact where uid = %d )
-               and not gcontact.id in ( select gcid from gcign where uid = %d )
+       $r2 = q("SELECT gcontact.* FROM gcontact
+               INNER JOIN `glink` ON `glink`.`gcid` = `gcontact`.`id`
+               WHERE `glink`.`uid` = 0 AND `glink`.`cid` = 0 AND `glink`.`zcid` = 0 AND NOT `gcontact`.`nurl` IN (SELECT `nurl` FROM `contact` WHERE `uid` = %d)
+               AND NOT `gcontact`.`name` IN (SELECT `name` FROM `contact` WHERE `uid` = %d)
+               AND NOT `gcontact`.`id` IN (SELECT `gcid` FROM `gcign` WHERE `uid` = %d)
                AND `gcontact`.`updated` != '0000-00-00 00:00:00'
+               AND `gcontact`.`last_contact` >= `gcontact`.`last_failure`
                AND `gcontact`.`network` IN (%s)
-               order by rand() limit %d, %d ",
+               ORDER BY rand() LIMIT %d, %d",
                intval($uid),
                intval($uid),
                intval($uid),
@@ -694,6 +1127,9 @@ function suggestion_query($uid, $start = 0, $limit = 80) {
        foreach ($r AS $suggestion)
                $list[$suggestion["nurl"]] = $suggestion;
 
+       while (sizeof($list) > ($limit))
+               array_pop($list);
+
        return $list;
 }
 
@@ -703,16 +1139,20 @@ function update_suggestions() {
 
        $done = array();
 
+       /// TODO Check if it is really neccessary to poll the own server
        poco_load(0,0,0,$a->get_baseurl() . '/poco');
 
        $done[] = $a->get_baseurl() . '/poco';
 
-       if(strlen(get_config('system','directory_submit_url'))) {
-               $x = fetch_url('http://dir.friendica.com/pubsites');
+       if(strlen(get_config('system','directory'))) {
+               $x = fetch_url(get_server()."/pubsites");
                if($x) {
                        $j = json_decode($x);
                        if($j->entries) {
                                foreach($j->entries as $entry) {
+
+                                       poco_check_server($entry->url);
+
                                        $url = $entry->url . '/poco';
                                        if(! in_array($url,$done))
                                                poco_load(0,0,0,$entry->url . '/poco');
@@ -721,8 +1161,9 @@ function update_suggestions() {
                }
        }
 
-       $r = q("select distinct(poco) as poco from contact where network = '%s'",
-               dbesc(NETWORK_DFRN)
+       // Query your contacts from Friendica and Redmatrix/Hubzilla for their contacts
+       $r = q("SELECT DISTINCT(`poco`) AS `poco` FROM `contact` WHERE `network` IN ('%s', '%s')",
+               dbesc(NETWORK_DFRN), dbesc(NETWORK_DIASPORA)
        );
 
        if(count($r)) {
@@ -733,3 +1174,617 @@ function update_suggestions() {
                }
        }
 }
+
+function poco_discover_federation() {
+       $last = get_config('poco','last_federation_discovery');
+
+       if($last) {
+               $next = $last + (24 * 60 * 60);
+               if($next > time())
+                       return;
+       }
+
+       // Discover Friendica, Hubzilla and Diaspora servers
+       $serverdata = fetch_url("http://the-federation.info/pods.json");
+
+       if ($serverdata) {
+               $servers = json_decode($serverdata);
+
+               foreach($servers->pods AS $server)
+                       poco_check_server("https://".$server->host);
+       }
+
+       // Discover GNU Social Servers
+       if (!get_config('system','ostatus_disabled')) {
+               $serverdata = "http://gstools.org/api/get_open_instances/";
+
+               $result = z_fetch_url($serverdata);
+               if ($result["success"]) {
+                       $servers = json_decode($result["body"]);
+
+                       foreach($servers->data AS $server)
+                               poco_check_server($server->instance_address);
+               }
+       }
+
+       set_config('poco','last_federation_discovery', time());
+}
+
+function poco_discover($complete = false) {
+
+       // Update the server list
+       poco_discover_federation();
+
+       $no_of_queries = 5;
+
+       $requery_days = intval(get_config("system", "poco_requery_days"));
+
+       if ($requery_days == 0)
+               $requery_days = 7;
+
+       $last_update = date("c", time() - (60 * 60 * 24 * $requery_days));
+
+       $r = q("SELECT `poco`, `nurl`, `url`, `network` FROM `gserver` WHERE `last_contact` >= `last_failure` AND `poco` != '' AND `last_poco_query` < '%s' ORDER BY RAND()", dbesc($last_update));
+       if ($r)
+               foreach ($r AS $server) {
+
+                       if (!poco_check_server($server["url"], $server["network"])) {
+                               // The server is not reachable? Okay, then we will try it later
+                               q("UPDATE `gserver` SET `last_poco_query` = '%s' WHERE `nurl` = '%s'", dbesc(datetime_convert()), dbesc($server["nurl"]));
+                               continue;
+                       }
+
+                       // Fetch all users from the other server
+                       $url = $server["poco"]."/?fields=displayName,urls,photos,updated,network,aboutMe,currentLocation,tags,gender,generation";
+
+                       logger("Fetch all users from the server ".$server["nurl"], LOGGER_DEBUG);
+
+                       $retdata = z_fetch_url($url);
+                       if ($retdata["success"]) {
+                               $data = json_decode($retdata["body"]);
+
+                               poco_discover_server($data, 2);
+
+                               if (get_config('system','poco_discovery') > 1) {
+
+                                       $timeframe = get_config('system','poco_discovery_since');
+                                       if ($timeframe == 0)
+                                               $timeframe = 30;
+
+                                       $updatedSince = date("Y-m-d H:i:s", time() - $timeframe * 86400);
+
+                                       // Fetch all global contacts from the other server (Not working with Redmatrix and Friendica versions before 3.3)
+                                       $url = $server["poco"]."/@global?updatedSince=".$updatedSince."&fields=displayName,urls,photos,updated,network,aboutMe,currentLocation,tags,gender,generation";
+
+                                       $success = false;
+
+                                       $retdata = z_fetch_url($url);
+                                       if ($retdata["success"]) {
+                                               logger("Fetch all global contacts from the server ".$server["nurl"], LOGGER_DEBUG);
+                                               $success = poco_discover_server(json_decode($retdata["body"]));
+                                       }
+
+                                       if (!$success AND (get_config('system','poco_discovery') > 2)) {
+                                               logger("Fetch contacts from users of the server ".$server["nurl"], LOGGER_DEBUG);
+                                               poco_discover_server_users($data, $server);
+                                       }
+                               }
+
+                               q("UPDATE `gserver` SET `last_poco_query` = '%s' WHERE `nurl` = '%s'", dbesc(datetime_convert()), dbesc($server["nurl"]));
+                               if (!$complete AND (--$no_of_queries == 0))
+                                       break;
+                       } else {
+                               // If the server hadn't replied correctly, then force a sanity check
+                               poco_check_server($server["url"], $server["network"], true);
+
+                               // If we couldn't reach the server, we will try it some time later
+                               q("UPDATE `gserver` SET `last_poco_query` = '%s' WHERE `nurl` = '%s'", dbesc(datetime_convert()), dbesc($server["nurl"]));
+                       }
+               }
+}
+
+function poco_discover_server_users($data, $server) {
+
+       if (!isset($data->entry))
+               return;
+
+       foreach ($data->entry AS $entry) {
+               $username = "";
+               if (isset($entry->urls)) {
+                       foreach($entry->urls as $url)
+                               if($url->type == 'profile') {
+                                       $profile_url = $url->value;
+                                       $urlparts = parse_url($profile_url);
+                                       $username = end(explode("/", $urlparts["path"]));
+                               }
+               }
+               if ($username != "") {
+                       logger("Fetch contacts for the user ".$username." from the server ".$server["nurl"], LOGGER_DEBUG);
+
+                       // Fetch all contacts from a given user from the other server
+                       $url = $server["poco"]."/".$username."/?fields=displayName,urls,photos,updated,network,aboutMe,currentLocation,tags,gender,generation";
+
+                       $retdata = z_fetch_url($url);
+                       if ($retdata["success"])
+                               poco_discover_server(json_decode($retdata["body"]), 3);
+               }
+       }
+}
+
+function poco_discover_server($data, $default_generation = 0) {
+
+       if (!isset($data->entry) OR !count($data->entry))
+               return false;
+
+       $success = false;
+
+       foreach ($data->entry AS $entry) {
+               $profile_url = '';
+               $profile_photo = '';
+               $connect_url = '';
+               $name = '';
+               $network = '';
+               $updated = '0000-00-00 00:00:00';
+               $location = '';
+               $about = '';
+               $keywords = '';
+               $gender = '';
+               $generation = $default_generation;
+
+               $name = $entry->displayName;
+
+               if(isset($entry->urls)) {
+                       foreach($entry->urls as $url) {
+                               if($url->type == 'profile') {
+                                       $profile_url = $url->value;
+                                       continue;
+                               }
+                               if($url->type == 'webfinger') {
+                                       $connect_url = str_replace('acct:' , '', $url->value);
+                                       continue;
+                               }
+                       }
+               }
+
+               if(isset($entry->photos)) {
+                       foreach($entry->photos as $photo) {
+                               if($photo->type == 'profile') {
+                                       $profile_photo = $photo->value;
+                                       continue;
+                               }
+                       }
+               }
+
+               if(isset($entry->updated))
+                       $updated = date("Y-m-d H:i:s", strtotime($entry->updated));
+
+               if(isset($entry->network))
+                       $network = $entry->network;
+
+               if(isset($entry->currentLocation))
+                       $location = $entry->currentLocation;
+
+               if(isset($entry->aboutMe))
+                       $about = html2bbcode($entry->aboutMe);
+
+               if(isset($entry->gender))
+                       $gender = $entry->gender;
+
+               if(isset($entry->generation) AND ($entry->generation > 0))
+                       $generation = ++$entry->generation;
+
+               if(isset($entry->tags))
+                       foreach($entry->tags as $tag)
+                               $keywords = implode(", ", $tag);
+
+               if ($generation > 0) {
+                       $success = true;
+
+                       logger("Store profile ".$profile_url, LOGGER_DEBUG);
+                       poco_check($profile_url, $name, $network, $profile_photo, $about, $location, $gender, $keywords, $connect_url, $updated, $generation, 0, 0, 0);
+                       logger("Done for profile ".$profile_url, LOGGER_DEBUG);
+               }
+       }
+       return $success;
+}
+
+/**
+ * @brief Removes unwanted parts from a contact url
+ *
+ * @param string $url Contact url
+ * @return string Contact url with the wanted parts
+ */
+function clean_contact_url($url) {
+       $parts = parse_url($url);
+
+       if (!isset($parts["scheme"]) OR !isset($parts["host"]))
+               return $url;
+
+       $new_url = $parts["scheme"]."://".$parts["host"];
+
+       if (isset($parts["port"]))
+               $new_url .= ":".$parts["port"];
+
+       if (isset($parts["path"]))
+               $new_url .= $parts["path"];
+
+       if ($new_url != $url)
+               logger("Cleaned contact url ".$url." to ".$new_url." - Called by: ".App::callstack(), LOGGER_DEBUG);
+
+       return $new_url;
+}
+
+/**
+ * @brief Replace alternate OStatus user format with the primary one
+ *
+ * @param arr $contact contact array (called by reference)
+ */
+function fix_alternate_contact_address(&$contact) {
+       if (($contact["network"] == NETWORK_OSTATUS) AND poco_alternate_ostatus_url($contact["url"])) {
+               $data = probe_url($contact["url"]);
+               if ($contact["network"] == NETWORK_OSTATUS) {
+                       logger("Fix primary url from ".$contact["url"]." to ".$data["url"]." - Called by: ".App::callstack(), LOGGER_DEBUG);
+                       $contact["url"] = $data["url"];
+                       $contact["addr"] = $data["addr"];
+                       $contact["alias"] = $data["alias"];
+                       $contact["server_url"] = $data["baseurl"];
+               }
+       }
+}
+
+/**
+ * @brief Fetch the gcontact id, add an entry if not existed
+ *
+ * @param arr $contact contact array
+ * @return bool|int Returns false if not found, integer if contact was found
+ */
+function get_gcontact_id($contact) {
+
+       $gcontact_id = 0;
+       $doprobing = false;
+
+       if (in_array($contact["network"], array(NETWORK_PHANTOM))) {
+               logger("Invalid network for contact url ".$contact["url"]." - Called by: ".App::callstack(), LOGGER_DEBUG);
+               return false;
+       }
+
+       if ($contact["network"] == NETWORK_STATUSNET)
+               $contact["network"] = NETWORK_OSTATUS;
+
+       // All new contacts are hidden by default
+       if (!isset($contact["hide"]))
+               $contact["hide"] = true;
+
+       // Replace alternate OStatus user format with the primary one
+       fix_alternate_contact_address($contact);
+
+       // Remove unwanted parts from the contact url (e.g. "?zrl=...")
+       if (in_array($contact["network"], array(NETWORK_DFRN, NETWORK_DIASPORA, NETWORK_OSTATUS)))
+               $contact["url"] = clean_contact_url($contact["url"]);
+
+       $r = q("SELECT `id`, `last_contact`, `last_failure`, `network` FROM `gcontact` WHERE `nurl` = '%s' ORDER BY `id` LIMIT 2",
+               dbesc(normalise_link($contact["url"])));
+
+       if ($r) {
+               $gcontact_id = $r[0]["id"];
+
+               // Update every 90 days
+               if (in_array($r[0]["network"], array(NETWORK_DFRN, NETWORK_DIASPORA, NETWORK_OSTATUS, ""))) {
+                       $last_failure_str = $r[0]["last_failure"];
+                       $last_failure = strtotime($r[0]["last_failure"]);
+                       $last_contact_str = $r[0]["last_contact"];
+                       $last_contact = strtotime($r[0]["last_contact"]);
+                       $doprobing = (((time() - $last_contact) > (90 * 86400)) AND ((time() - $last_failure) > (90 * 86400)));
+               }
+       } else {
+               q("INSERT INTO `gcontact` (`name`, `nick`, `addr` , `network`, `url`, `nurl`, `photo`, `created`, `updated`, `location`, `about`, `hide`, `generation`)
+                       VALUES ('%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', %d, %d)",
+                       dbesc($contact["name"]),
+                       dbesc($contact["nick"]),
+                       dbesc($contact["addr"]),
+                       dbesc($contact["network"]),
+                       dbesc($contact["url"]),
+                       dbesc(normalise_link($contact["url"])),
+                       dbesc($contact["photo"]),
+                       dbesc(datetime_convert()),
+                       dbesc(datetime_convert()),
+                       dbesc($contact["location"]),
+                       dbesc($contact["about"]),
+                       intval($contact["hide"]),
+                       intval($contact["generation"])
+               );
+
+               $r = q("SELECT `id`, `network` FROM `gcontact` WHERE `nurl` = '%s' ORDER BY `id` LIMIT 2",
+                       dbesc(normalise_link($contact["url"])));
+
+               if ($r) {
+                       $gcontact_id = $r[0]["id"];
+
+                       $doprobing = in_array($r[0]["network"], array(NETWORK_DFRN, NETWORK_DIASPORA, NETWORK_OSTATUS, ""));
+               }
+       }
+
+       if ($doprobing) {
+               logger("Last Contact: ". $last_contact_str." - Last Failure: ".$last_failure_str." - Checking: ".$contact["url"], LOGGER_DEBUG);
+               proc_run('php', 'include/gprobe.php', bin2hex($contact["url"]));
+       }
+
+       if ((count($r) > 1) AND ($gcontact_id > 0) AND ($contact["url"] != ""))
+        q("DELETE FROM `gcontact` WHERE `nurl` = '%s' AND `id` != %d",
+               dbesc(normalise_link($contact["url"])),
+               intval($gcontact_id));
+
+       return $gcontact_id;
+}
+
+/**
+ * @brief Updates the gcontact table from a given array
+ *
+ * @param arr $contact contact array
+ * @return bool|int Returns false if not found, integer if contact was found
+ */
+function update_gcontact($contact) {
+
+       /// @todo update contact table as well
+
+       $gcontact_id = get_gcontact_id($contact);
+
+       if (!$gcontact_id)
+               return false;
+
+       $r = q("SELECT `name`, `nick`, `photo`, `location`, `about`, `addr`, `generation`, `birthday`, `gender`, `keywords`,
+                       `hide`, `nsfw`, `network`, `alias`, `notify`, `server_url`, `connect`, `updated`, `url`
+               FROM `gcontact` WHERE `id` = %d LIMIT 1",
+               intval($gcontact_id));
+
+       // Get all field names
+       $fields = array();
+       foreach ($r[0] AS $field => $data)
+               $fields[$field] = $data;
+
+       unset($fields["url"]);
+       unset($fields["updated"]);
+       unset($fields["hide"]);
+
+       // Bugfix: We had an error in the storing of keywords which lead to the "0"
+       // This value is still transmitted via poco.
+       if ($contact["keywords"] == "0")
+               unset($contact["keywords"]);
+
+       if ($r[0]["keywords"] == "0")
+               $r[0]["keywords"] = "";
+
+       // assign all unassigned fields from the database entry
+       foreach ($fields AS $field => $data)
+               if (!isset($contact[$field]) OR ($contact[$field] == ""))
+                       $contact[$field] = $r[0][$field];
+
+       if (!isset($contact["hide"]))
+               $contact["hide"] = $r[0]["hide"];
+
+       $fields["hide"] = $r[0]["hide"];
+
+       if ($contact["network"] == NETWORK_STATUSNET)
+               $contact["network"] = NETWORK_OSTATUS;
+
+       // Replace alternate OStatus user format with the primary one
+       fix_alternate_contact_address($contact);
+
+       if (!isset($contact["updated"]))
+               $contact["updated"] = datetime_convert();
+
+       if ($contact["server_url"] == "") {
+               $server_url = $contact["url"];
+
+               $server_url = matching_url($server_url, $contact["alias"]);
+               if ($server_url != "")
+                       $contact["server_url"] = $server_url;
+
+               $server_url = matching_url($server_url, $contact["photo"]);
+               if ($server_url != "")
+                       $contact["server_url"] = $server_url;
+
+               $server_url = matching_url($server_url, $contact["notify"]);
+               if ($server_url != "")
+                       $contact["server_url"] = $server_url;
+       } else
+               $contact["server_url"] = normalise_link($contact["server_url"]);
+
+       if (($contact["addr"] == "") AND ($contact["server_url"] != "") AND ($contact["nick"] != "")) {
+               $hostname = str_replace("http://", "", $contact["server_url"]);
+               $contact["addr"] = $contact["nick"]."@".$hostname;
+       }
+
+       // Check if any field changed
+       $update = false;
+       unset($fields["generation"]);
+
+       if ((($contact["generation"] > 0) AND ($contact["generation"] <= $r[0]["generation"])) OR ($r[0]["generation"] == 0)) {
+               foreach ($fields AS $field => $data)
+                       if ($contact[$field] != $r[0][$field]) {
+                               logger("Difference for contact ".$contact["url"]." in field '".$field."'. New value: '".$contact[$field]."', old value '".$r[0][$field]."'", LOGGER_DEBUG);
+                               $update = true;
+                       }
+
+               if ($contact["generation"] < $r[0]["generation"]) {
+                       logger("Difference for contact ".$contact["url"]." in field 'generation'. new value: '".$contact["generation"]."', old value '".$r[0]["generation"]."'", LOGGER_DEBUG);
+                       $update = true;
+               }
+       }
+
+       if ($update) {
+               logger("Update gcontact for ".$contact["url"]." Callstack: ".App::callstack(), LOGGER_DEBUG);
+
+               q("UPDATE `gcontact` SET `photo` = '%s', `name` = '%s', `nick` = '%s', `addr` = '%s', `network` = '%s',
+                                       `birthday` = '%s', `gender` = '%s', `keywords` = '%s', `hide` = %d, `nsfw` = %d,
+                                       `alias` = '%s', `notify` = '%s', `url` = '%s',
+                                       `location` = '%s', `about` = '%s', `generation` = %d, `updated` = '%s',
+                                       `server_url` = '%s', `connect` = '%s'
+                               WHERE `nurl` = '%s' AND (`generation` = 0 OR `generation` >= %d)",
+                       dbesc($contact["photo"]), dbesc($contact["name"]), dbesc($contact["nick"]),
+                       dbesc($contact["addr"]), dbesc($contact["network"]), dbesc($contact["birthday"]),
+                       dbesc($contact["gender"]), dbesc($contact["keywords"]), intval($contact["hide"]),
+                       intval($contact["nsfw"]), dbesc($contact["alias"]), dbesc($contact["notify"]),
+                       dbesc($contact["url"]), dbesc($contact["location"]), dbesc($contact["about"]),
+                       intval($contact["generation"]), dbesc($contact["updated"]),
+                       dbesc($contact["server_url"]), dbesc($contact["connect"]),
+                       dbesc(normalise_link($contact["url"])), intval($contact["generation"]));
+
+
+               // Now update the contact entry with the user id "0" as well.
+               // This is used for the shadow copies of public items.
+               $r = q("SELECT `id` FROM `contact` WHERE `nurl` = '%s' AND `uid` = 0 ORDER BY `id` LIMIT 1",
+                       dbesc(normalise_link($contact["url"])));
+
+               if ($r) {
+                       logger("Update shadow contact ".$r[0]["id"], LOGGER_DEBUG);
+
+                       update_contact_avatar($contact["photo"], 0, $r[0]["id"]);
+
+                       q("UPDATE `contact` SET `name` = '%s', `nick` = '%s', `addr` = '%s',
+                                               `network` = '%s', `bd` = '%s', `gender` = '%s',
+                                               `keywords` = '%s', `alias` = '%s', `url` = '%s',
+                                               `location` = '%s', `about` = '%s'
+                                       WHERE `id` = %d",
+                               dbesc($contact["name"]), dbesc($contact["nick"]), dbesc($contact["addr"]),
+                               dbesc($contact["network"]), dbesc($contact["birthday"]), dbesc($contact["gender"]),
+                               dbesc($contact["keywords"]), dbesc($contact["alias"]), dbesc($contact["url"]),
+                               dbesc($contact["location"]), dbesc($contact["about"]), intval($r[0]["id"]));
+               }
+       }
+
+       return $gcontact_id;
+}
+
+/**
+ * @brief Updates the gcontact entry from probe
+ *
+ * @param str $url profile link
+ */
+function update_gcontact_from_probe($url) {
+       $data = probe_url($url);
+
+       if (in_array($data["network"], array(NETWORK_PHANTOM))) {
+               logger("Invalid network for contact url ".$data["url"]." - Called by: ".App::callstack(), LOGGER_DEBUG);
+               return;
+       }
+
+       update_gcontact($data);
+}
+
+/**
+ * @brief Update the gcontact entry for a given user id
+ *
+ * @param int $uid User ID
+ */
+function update_gcontact_for_user($uid) {
+       $r = q("SELECT `profile`.`locality`, `profile`.`region`, `profile`.`country-name`,
+                       `profile`.`name`, `profile`.`about`, `profile`.`gender`,
+                       `profile`.`pub_keywords`, `profile`.`dob`, `profile`.`photo`,
+                       `profile`.`net-publish`, `user`.`nickname`, `user`.`hidewall`,
+                       `contact`.`notify`, `contact`.`url`, `contact`.`addr`
+               FROM `profile`
+                       INNER JOIN `user` ON `user`.`uid` = `profile`.`uid`
+                       INNER JOIN `contact` ON `contact`.`uid` = `profile`.`uid`
+               WHERE `profile`.`uid` = %d AND `profile`.`is-default` AND `contact`.`self`",
+               intval($uid));
+
+       $location = formatted_location(array("locality" => $r[0]["locality"], "region" => $r[0]["region"],
+                                               "country-name" => $r[0]["country-name"]));
+
+       // The "addr" field was added in 3.4.3 so it can be empty for older users
+       if ($r[0]["addr"] != "")
+               $addr = $r[0]["nickname"].'@'.str_replace(array("http://", "https://"), "", App::get_baseurl());
+       else
+               $addr = $r[0]["addr"];
+
+       $gcontact = array("name" => $r[0]["name"], "location" => $location, "about" => $r[0]["about"],
+                       "gender" => $r[0]["gender"], "keywords" => $r[0]["pub_keywords"],
+                       "birthday" => $r[0]["dob"], "photo" => $r[0]["photo"],
+                       "notify" => $r[0]["notify"], "url" => $r[0]["url"],
+                       "hide" => ($r[0]["hidewall"] OR !$r[0]["net-publish"]),
+                       "nick" => $r[0]["nickname"], "addr" => $addr,
+                       "connect" => $addr, "server_url" => App::get_baseurl(),
+                       "generation" => 1, "network" => NETWORK_DFRN);
+
+       update_gcontact($gcontact);
+}
+
+/**
+ * @brief Fetches users of given GNU Social server
+ *
+ * If the "Statistics" plugin is enabled (See http://gstools.org/ for details) we query user data with this.
+ *
+ * @param str $server Server address
+ */
+function gs_fetch_users($server) {
+
+       logger("Fetching users from GNU Social server ".$server, LOGGER_DEBUG);
+
+       $a = get_app();
+
+       $url = $server."/main/statistics";
+
+       $result = z_fetch_url($url);
+       if (!$result["success"])
+               return false;
+
+       $statistics = json_decode($result["body"]);
+
+       if (is_object($statistics->config)) {
+               if ($statistics->config->instance_with_ssl)
+                       $server = "https://";
+               else
+                       $server = "http://";
+
+               $server .= $statistics->config->instance_address;
+
+               $hostname = $statistics->config->instance_address;
+       } else {
+               if ($statistics->instance_with_ssl)
+                       $server = "https://";
+               else
+                       $server = "http://";
+
+               $server .= $statistics->instance_address;
+
+               $hostname = $statistics->instance_address;
+       }
+
+       if (is_object($statistics->users))
+               foreach ($statistics->users AS $nick => $user) {
+                       $profile_url = $server."/".$user->nickname;
+
+                       $contact = array("url" => $profile_url,
+                                       "name" => $user->fullname,
+                                       "addr" => $user->nickname."@".$hostname,
+                                       "nick" => $user->nickname,
+                                       "about" => $user->bio,
+                                       "network" => NETWORK_OSTATUS,
+                                       "photo" => $a->get_baseurl()."/images/person-175.jpg");
+                       get_gcontact_id($contact);
+               }
+}
+
+/**
+ * @brief Asking GNU Social server on a regular base for their user data
+ *
+ */
+function gs_discover() {
+
+       $requery_days = intval(get_config("system", "poco_requery_days"));
+
+       $last_update = date("c", time() - (60 * 60 * 24 * $requery_days));
+
+       $r = q("SELECT `nurl`, `url` FROM `gserver` WHERE `last_contact` >= `last_failure` AND `network` = '%s' AND `last_poco_query` < '%s' ORDER BY RAND() LIMIT 5",
+               dbesc(NETWORK_OSTATUS), dbesc($last_update));
+
+       if (!$r)
+               return;
+
+       foreach ($r AS $server) {
+               gs_fetch_users($server["url"]);
+               q("UPDATE `gserver` SET `last_poco_query` = '%s' WHERE `nurl` = '%s'", dbesc(datetime_convert()), dbesc($server["nurl"]));
+       }
+}
+?>