]> git.mxchange.org Git - friendica.git/blobdiff - src/Protocol/Feed.php
Reducing parameter list
[friendica.git] / src / Protocol / Feed.php
index 86b76d309bd38703a64c66e50a2001da06bc224c..821de8c33580556f3d8675531a65ee5f6782a5b5 100644 (file)
@@ -24,15 +24,24 @@ namespace Friendica\Protocol;
 use DOMDocument;
 use DOMXPath;
 use Friendica\Content\PageInfo;
+use Friendica\Content\Text\BBCode;
 use Friendica\Content\Text\HTML;
+use Friendica\Core\Cache\Duration;
 use Friendica\Core\Logger;
 use Friendica\Core\Protocol;
+use Friendica\Core\Worker;
 use Friendica\Database\DBA;
 use Friendica\DI;
+use Friendica\Model\Contact;
+use Friendica\Model\Conversation;
 use Friendica\Model\Item;
+use Friendica\Model\Post;
 use Friendica\Model\Tag;
+use Friendica\Model\User;
+use Friendica\Util\DateTimeFormat;
 use Friendica\Util\Network;
 use Friendica\Util\ParseUrl;
+use Friendica\Util\Strings;
 use Friendica\Util\XML;
 
 /**
@@ -93,7 +102,7 @@ class Feed
                        $dfrn_importer = DFRN::getImporter($contact['id'], $importer['uid']);
                        if (!empty($dfrn_importer)) {
                                Logger::info('Now import the DFRN feed');
-                               DFRN::import($xml, $dfrn_importer, true);
+                               DFRN::import($xml, $dfrn_importer, true, Conversation::PARCEL_LEGACY_DFRN);
                                return;
                        }
                }
@@ -294,6 +303,7 @@ class Feed
                }
 
                $items = [];
+               $creation_dates = [];
 
                // Limit the number of items that are about to be fetched
                $total_items = ($entries->length - 1);
@@ -302,6 +312,8 @@ class Feed
                        $total_items = $max_items;
                }
 
+               $postings = [];
+
                // Importing older entries first
                for ($i = $total_items; $i >= 0; --$i) {
                        $entry = $entries->item($i);
@@ -344,19 +356,7 @@ class Feed
 
                        $orig_plink = $item["plink"];
 
-                       $item["plink"] = Network::finalUrl($item["plink"]);
-
-                       $item["parent-uri"] = $item["uri"];
-
-                       if (!$dryRun) {
-                               $condition = ["`uid` = ? AND `uri` = ? AND `network` IN (?, ?)",
-                                       $importer["uid"], $item["uri"], Protocol::FEED, Protocol::DFRN];
-                               $previous = Item::selectFirst(['id'], $condition);
-                               if (DBA::isResult($previous)) {
-                                       Logger::info("Item with uri " . $item["uri"] . " for user " . $importer["uid"] . " already existed under id " . $previous["id"]);
-                                       continue;
-                               }
-                       }
+                       $item["plink"] = DI::httpRequest()->finalUrl($item["plink"]);
 
                        $item["title"] = XML::getFirstNodeValue($xpath, 'atom:title/text()', $entry);
 
@@ -397,6 +397,19 @@ class Feed
                                $item["edited"] = $updated;
                        }
 
+                       if (!$dryRun) {
+                               $condition = ["`uid` = ? AND `uri` = ? AND `network` IN (?, ?)",
+                                       $importer["uid"], $item["uri"], Protocol::FEED, Protocol::DFRN];
+                               $previous = Item::selectFirst(['id', 'created'], $condition);
+                               if (DBA::isResult($previous)) {
+                                       // Use the creation date when the post had been stored. It can happen this date changes in the feed.
+                                       $creation_dates[] = $previous['created'];
+                                       Logger::info("Item with uri " . $item["uri"] . " for user " . $importer["uid"] . " already existed under id " . $previous["id"]);
+                                       continue;
+                               }
+                               $creation_dates[] = DateTimeFormat::utc($item['created']);
+                       }
+
                        $creator = XML::getFirstNodeValue($xpath, 'author/text()', $entry);
 
                        if (empty($creator)) {
@@ -426,28 +439,22 @@ class Feed
                        $enclosures = $xpath->query("enclosure|atom:link[@rel='enclosure']", $entry);
                        foreach ($enclosures AS $enclosure) {
                                $href = "";
-                               $length = "";
-                               $type = "";
+                               $length = null;
+                               $type = null;
 
                                foreach ($enclosure->attributes AS $attribute) {
                                        if (in_array($attribute->name, ["url", "href"])) {
                                                $href = $attribute->textContent;
                                        } elseif ($attribute->name == "length") {
-                                               $length = $attribute->textContent;
+                                               $length = (int)$attribute->textContent;
                                        } elseif ($attribute->name == "type") {
                                                $type = $attribute->textContent;
                                        }
                                }
 
-                               if (!empty($item["attach"])) {
-                                       $item["attach"] .= ',';
-                               } else {
-                                       $item["attach"] = '';
+                               if (!empty($href)) {
+                                       $attachments[] = ['type' => Post\Media::DOCUMENT, 'url' => $href, 'mimetype' => $type, 'size' => $length];
                                }
-
-                               $attachments[] = ["link" => $href, "type" => $type, "length" => $length];
-
-                               $item["attach"] .= '[attach]href="' . $href . '" length="' . $length . '" type="' . $type . '"[/attach]';
                        }
 
                        $taglist = [];
@@ -484,17 +491,31 @@ class Feed
                        }
                        $item["body"] = HTML::toBBCode($body, $basepath);
 
+                       // Remove tracking pixels
+                       $item["body"] = preg_replace("/\[img=1x1\]([^\[\]]*)\[\/img\]/Usi", '', $item["body"]);
+
                        if (($item["body"] == '') && ($item["title"] != '')) {
                                $item["body"] = $item["title"];
                                $item["title"] = '';
                        }
 
+                       if ($dryRun) {
+                               $items[] = $item;
+                               break;
+                       } elseif (!Item::isValid($item)) {
+                               Logger::info('Feed item is invalid', ['created' => $item['created'], 'uid' => $item['uid'], 'uri' => $item['uri']]);
+                               continue;
+                       } elseif (Item::isTooOld($item)) {
+                               Logger::info('Feed is too old', ['created' => $item['created'], 'uid' => $item['uid'], 'uri' => $item['uri']]);
+                               continue;
+                       }
+
                        $preview = '';
                        if (!empty($contact["fetch_further_information"]) && ($contact["fetch_further_information"] < 3)) {
                                // Handle enclosures and treat them as preview picture
                                foreach ($attachments AS $attachment) {
-                                       if ($attachment["type"] == "image/jpeg") {
-                                               $preview = $attachment["link"];
+                                       if ($attachment["mimetype"] == "image/jpeg") {
+                                               $preview = $attachment["url"];
                                        }
                                }
 
@@ -515,6 +536,9 @@ class Feed
                                        $replace = true;
                                }
 
+                               $saved_body = $item["body"];
+                               $saved_title = $item["title"];
+
                                if ($replace) {
                                        $item["body"] = trim($item["title"]);
                                }
@@ -531,12 +555,29 @@ class Feed
                                        }
                                }
 
-                               // We always strip the title since it will be added in the page information
-                               $item["title"] = "";
-                               $item["body"] = $item["body"] . "\n" . PageInfo::getFooterFromUrl($item["plink"], false, $preview, ($contact["fetch_further_information"] == 2), $contact["ffi_keyword_denylist"] ?? '');
-                               $taglist = $contact["fetch_further_information"] == 2 ? PageInfo::getTagsFromUrl($item["plink"], $preview, $contact["ffi_keyword_denylist"] ?? '') : [];
-                               $item["object-type"] = Activity\ObjectType::BOOKMARK;
-                               unset($item["attach"]);
+                               $data = PageInfo::queryUrl($item["plink"], false, $preview, ($contact["fetch_further_information"] == 2), $contact["ffi_keyword_denylist"] ?? '');
+
+                               if (!empty($data)) {
+                                       // Take the data that was provided by the feed if the query is empty
+                                       if (($data['type'] == 'link') && empty($data['title']) && empty($data['text'])) {
+                                               $data['title'] = $saved_title;
+                                               $item["body"] = $saved_body;
+                                       }
+
+                                       $data_text = strip_tags(trim($data['text'] ?? ''));
+                                       $item_body = strip_tags(trim($item['body'] ?? ''));
+
+                                       if (!empty($data_text) && (($data_text == $item_body) || strstr($item_body, $data_text))) {
+                                               $data['text'] = '';
+                                       }
+
+                                       // We always strip the title since it will be added in the page information
+                                       $item["title"] = "";
+                                       $item["body"] = $item["body"] . "\n" . PageInfo::getFooterFromData($data, false);
+                                       $taglist = $contact["fetch_further_information"] == 2 ? PageInfo::getTagsFromUrl($item["plink"], $preview, $contact["ffi_keyword_denylist"] ?? '') : [];
+                                       $item["object-type"] = Activity\ObjectType::BOOKMARK;
+                                       $attachments = [];
+                               }
                        } else {
                                if (!empty($summary)) {
                                        $item["body"] = '[abstract]' . HTML::toBBCode($summary, $basepath) . "[/abstract]\n" . $item["body"];
@@ -544,7 +585,7 @@ class Feed
 
                                if (!empty($contact["fetch_further_information"]) && ($contact["fetch_further_information"] == 3)) {
                                        if (empty($taglist)) {
-                                               $taglist = PageInfo::getTagsFromUrl($item["plink"], $preview, $contact["ffi_keyword_denylist"]);
+                                               $taglist = PageInfo::getTagsFromUrl($item["plink"], $preview, $contact["ffi_keyword_denylist"] ?? '');
                                        }
                                        $item["body"] .= "\n" . self::tagToString($taglist);
                                } else {
@@ -557,39 +598,240 @@ class Feed
                                }
                        }
 
-                       if ($dryRun) {
-                               $items[] = $item;
-                               break;
+                       Logger::info('Stored feed', ['item' => $item]);
+
+                       $notify = Item::isRemoteSelf($contact, $item);
+
+                       // Distributed items should have a well formatted URI.
+                       // Additionally we have to avoid conflicts with identical URI between imported feeds and these items.
+                       if ($notify) {
+                               $item['guid'] = Item::guidFromUri($orig_plink, DI::baseUrl()->getHostname());
+                               $item['uri'] = Item::newURI($item['uid'], $item['guid']);
+                               unset($item['thr-parent']);
+                               unset($item['parent-uri']);
+
+                               // Set the delivery priority for "remote self" to "medium"
+                               $notify = PRIORITY_MEDIUM;
+                       }
+
+                       if (!Post\Delayed::exists($item["uri"])) {
+                               $postings[] = ['item' => $item, 'notify' => $notify,
+                                       'taglist' => $taglist, 'attachments' => $attachments];
+                       } else {
+                               Logger::info('Post already exists in the delayed posts queue', ['uri' => $item["uri"]]);
+                       }
+               }
+
+               if (!empty($postings)) {
+                       $min_posting = DI::config()->get('system', 'minimum_posting_interval', 0);
+                       $total = count($postings);
+                       if ($total > 1) {
+                               // Posts shouldn't be delayed more than a day
+                               $interval = min(1440, self::getPollInterval($contact));
+                               $delay = max(round(($interval * 60) / $total), 60 * $min_posting);
+                               Logger::notice('Got posting delay', ['delay' => $delay, 'interval' => $interval, 'items' => $total, 'cid' => $contact['id'], 'url' => $contact['url']]);
                        } else {
-                               Logger::info('Stored feed', ['item' => $item]);
+                               $delay = 0;
+                       }
 
-                               $notify = Item::isRemoteSelf($contact, $item);
+                       $post_delay = 0;
+
+                       foreach ($postings as $posting) {
+                               if ($delay > 0) {
+                                       $publish_time = time() + $post_delay;
+                                       Logger::notice('Got publishing date', ['delay' => $delay, 'cid' => $contact['id'], 'url' => $contact['url']]);
+                                       $post_delay += $delay;
+                               } else {
+                                       $publish_time = time();
+                               }
+
+                               $last_publish = DI::pConfig()->get($posting['item']['uid'], 'system', 'last_publish', 0, true);
+                               $next_publish = max($last_publish + (60 * $min_posting), time());
+                               if ($publish_time < $next_publish) {
+                                       Logger::notice('Adapting publish time',
+                                               ['last' => date(DateTimeFormat::MYSQL, $last_publish),
+                                               'next' => date(DateTimeFormat::MYSQL, $next_publish),
+                                               'publish' => date(DateTimeFormat::MYSQL, $publish_time)]);
+                                       $publish_time = $next_publish;
+                               }
+                               $publish_at = date(DateTimeFormat::MYSQL, $publish_time);
+
+                               Post\Delayed::add($publish_at, $posting['item'], $posting['notify'], $posting['taglist'], $posting['attachments']);
+                               DI::pConfig()->set($item['uid'], 'system', 'last_publish', $next_publish);
+                       }
+               }
+
+               if (!$dryRun && DI::config()->get('system', 'adjust_poll_frequency')) {
+                       self::adjustPollFrequency($contact, $creation_dates);
+               }
+
+               return ["header" => $author, "items" => $items];
+       }
+
+       /**
+        * Automatically adjust the poll frequency according to the post frequency
+        *
+        * @param array $contact
+        * @param array $creation_dates
+        * @return void
+        */
+       private static function adjustPollFrequency(array $contact, array $creation_dates)
+       {
+               if ($contact['network'] != Protocol::FEED) {
+                       Logger::info('Contact is no feed, skip.', ['id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url'], 'network' => $contact['network']]);
+                       return;
+               }
 
-                               // Distributed items should have a well formatted URI.
-                               // Additionally we have to avoid conflicts with identical URI between imported feeds and these items.
-                               if ($notify) {
-                                       $item['guid'] = Item::guidFromUri($orig_plink, DI::baseUrl()->getHostname());
-                                       unset($item['uri']);
-                                       unset($item['parent-uri']);
+               if (!empty($creation_dates)) {
+                       // Count the post frequency and the earliest and latest post date
+                       $frequency = [];
+                       $oldest = time();
+                       $newest = 0;
+                       $oldest_date = $newest_date = '';
+
+                       foreach ($creation_dates as $date) {
+                               $timestamp = strtotime($date);
+                               $day = intdiv($timestamp, 86400);
+                               $hour = $timestamp % 86400;
+
+                               // Only have a look at values from the last seven days
+                               if (((time() / 86400) - $day) < 7) {
+                                       if (empty($frequency[$day])) {
+                                               $frequency[$day] = ['count' => 1, 'low' => $hour, 'high' => $hour];
+                                       } else {
+                                               ++$frequency[$day]['count'];
+                                               if ($frequency[$day]['low'] > $hour) {
+                                                       $frequency[$day]['low'] = $hour;
+                                               }
+                                               if ($frequency[$day]['high'] < $hour) {
+                                                       $frequency[$day]['high'] = $hour;
+                                               }
+                                       }
+                               }
+                               if ($oldest > $day) {
+                                       $oldest = $day;
+                                       $oldest_date = $date;
+                               }
 
-                                       // Set the delivery priority for "remote self" to "medium"
-                                       $notify = PRIORITY_MEDIUM;
+                               if ($newest < $day) {
+                                       $newest = $day;
+                                       $newest_date = $date;
                                }
+                       }
+
+                       if (count($creation_dates) == 1) {
+                               Logger::info('Feed had posted a single time, switching to daily polling', ['newest' => $newest_date, 'id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
+                               $priority = 8; // Poll once a day
+                       }
+
+                       if (empty($priority) && (((time() / 86400) - $newest) > 730)) {
+                               Logger::info('Feed had not posted for two years, switching to monthly polling', ['newest' => $newest_date, 'id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
+                               $priority = 10; // Poll every month
+                       }
+
+                       if (empty($priority) && (((time() / 86400) - $newest) > 365)) {
+                               Logger::info('Feed had not posted for a year, switching to weekly polling', ['newest' => $newest_date, 'id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
+                               $priority = 9; // Poll every week
+                       }
 
-                               $id = Item::insert($item, $notify);
+                       if (empty($priority) && empty($frequency)) {
+                               Logger::info('Feed had not posted for at least a week, switching to daily polling', ['newest' => $newest_date, 'id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
+                               $priority = 8; // Poll once a day
+                       }
+
+                       if (empty($priority)) {
+                               // Calculate the highest "posts per day" value
+                               $max = 0;
+                               foreach ($frequency as $entry) {
+                                       if (($entry['count'] == 1) || ($entry['high'] == $entry['low'])) {
+                                               continue;
+                                       }
 
-                               Logger::info("Feed for contact " . $contact["url"] . " stored under id " . $id);
+                                       // We take the earliest and latest post day and interpolate the number of post per day
+                                       // that would had been created with this post frequency
 
-                               if (!empty($id) && !empty($taglist)) {
-                                       $feeditem = Item::selectFirst(['uri-id'], ['id' => $id]);
-                                       foreach ($taglist as $tag) {
-                                               Tag::store($feeditem['uri-id'], Tag::HASHTAG, $tag);
-                                       }                                       
+                                       // Assume at least four hours between oldest and newest post per day - should be okay for news outlets
+                                       $duration = max($entry['high'] - $entry['low'], 14400);
+                                       $ppd = (86400 / $duration) * $entry['count'];
+                                       if ($ppd > $max) {
+                                               $max = $ppd;
+                                       }
                                }
+                               if ($max > 48) {
+                                       $priority = 1; // Poll every quarter hour
+                               } elseif ($max > 24) {
+                                       $priority = 2; // Poll half an hour
+                               } elseif ($max > 12) {
+                                       $priority = 3; // Poll hourly
+                               } elseif ($max > 8) {
+                                       $priority = 4; // Poll every two hours
+                               } elseif ($max > 4) {
+                                       $priority = 5; // Poll every three hours
+                               } elseif ($max > 2) {
+                                       $priority = 6; // Poll every six hours
+                               } else {
+                                       $priority = 7; // Poll twice a day
+                               }
+                               Logger::info('Calculated priority by the posts per day', ['priority' => $priority, 'max' => round($max, 2), 'id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
                        }
+               } else {
+                       Logger::info('No posts, switching to daily polling', ['id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
+                       $priority = 8; // Poll once a day
                }
 
-               return ["header" => $author, "items" => $items];
+               if ($contact['rating'] != $priority) {
+                       Logger::notice('Adjusting priority', ['old' => $contact['rating'], 'new' => $priority, 'id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $contact['url']]);
+                       DBA::update('contact', ['rating' => $priority], ['id' => $contact['id']]);
+               }
+       }
+
+       /**
+        * Get the poll interval for the given contact array
+        *
+        * @param array $contact
+        * @return int Poll interval in minutes
+        */
+       public static function getPollInterval(array $contact)
+       {
+               if (in_array($contact['network'], [Protocol::MAIL, Protocol::FEED])) {
+                       $ratings = [0, 3, 7, 8, 9, 10];
+                       if (DI::config()->get('system', 'adjust_poll_frequency') && ($contact['network'] == Protocol::FEED)) {
+                               $rating = $contact['rating'];
+                       } elseif (array_key_exists($contact['priority'], $ratings)) {
+                               $rating = $ratings[$contact['priority']];
+                       } else {
+                               $rating = -1;
+                       }
+               } else {
+                       // Check once a week per default for all other networks
+                       $rating = 9;
+               }
+
+               // Friendica and OStatus are checked once a day
+               if (in_array($contact['network'], [Protocol::DFRN, Protocol::OSTATUS])) {
+                       $rating = 8;
+               }
+
+               // Check archived contacts or contacts with unsupported protocols once a month
+               if ($contact['archive'] || in_array($contact['network'], [Protocol::ZOT, Protocol::PHANTOM])) {
+                       $rating = 10;
+               }
+
+               if ($rating < 0) {
+                       return 0;
+               }
+               /*
+                * Based on $contact['priority'], should we poll this site now? Or later?
+                */
+
+               $min_poll_interval = max(1, DI::config()->get('system', 'min_poll_interval'));
+
+               $poll_intervals = [$min_poll_interval, 15, 30, 60, 120, 180, 360, 720 ,1440, 10080, 43200];
+
+               //$poll_intervals = [$min_poll_interval . ' minute', '15 minute', '30 minute',
+               //      '1 hour', '2 hour', '3 hour', '6 hour', '12 hour' ,'1 day', '1 week', '1 month'];
+
+               return $poll_intervals[$rating];
        }
 
        /**
@@ -606,7 +848,7 @@ class Feed
                        if ($tagstr != "") {
                                $tagstr .= ", ";
                        }
-       
+
                        $tagstr .= "#[url=" . DI::baseUrl() . "/search?tag=" . urlencode($tag) . "]" . $tag . "[/url]";
                }
 
@@ -638,4 +880,389 @@ class Feed
                }
                return ($title == $body);
        }
+
+       /**
+        * Creates the Atom feed for a given nickname
+        *
+        * Supported filters:
+        * - activity (default): all the public posts
+        * - posts: all the public top-level posts
+        * - comments: all the public replies
+        *
+        * Updates the provided last_update parameter if the result comes from the
+        * cache or it is empty
+        *
+        * @param string  $owner_nick  Nickname of the feed owner
+        * @param string  $last_update Date of the last update
+        * @param integer $max_items   Number of maximum items to fetch
+        * @param string  $filter      Feed items filter (activity, posts or comments)
+        * @param boolean $nocache     Wether to bypass caching
+        *
+        * @return string Atom feed
+        * @throws \Friendica\Network\HTTPException\InternalServerErrorException
+        * @throws \ImagickException
+        */
+       public static function atom($owner_nick, $last_update, $max_items = 300, $filter = 'activity', $nocache = false)
+       {
+               $stamp = microtime(true);
+
+               $owner = User::getOwnerDataByNick($owner_nick);
+               if (!$owner) {
+                       return;
+               }
+
+               $cachekey = "feed:feed:" . $owner_nick . ":" . $filter . ":" . $last_update;
+
+               $previous_created = $last_update;
+
+               // Don't cache when the last item was posted less then 15 minutes ago (Cache duration)
+               if ((time() - strtotime($owner['last-item'])) < 15*60) {
+                       $result = DI::cache()->get($cachekey);
+                       if (!$nocache && !is_null($result)) {
+                               Logger::info('Cached feed duration', ['seconds' => number_format(microtime(true) - $stamp, 3), 'nick' => $owner_nick, 'filter' => $filter, 'created' => $previous_created]);
+                               return $result['feed'];
+                       }
+               }
+
+               $check_date = empty($last_update) ? '' : DateTimeFormat::utc($last_update);
+               $authorid = Contact::getIdForURL($owner["url"]);
+
+               $condition = ["`uid` = ? AND `received` > ? AND NOT `deleted` AND `gravity` IN (?, ?)
+                       AND `private` != ? AND `visible` AND `wall` AND `parent-network` IN (?, ?, ?, ?)",
+                       $owner["uid"], $check_date, GRAVITY_PARENT, GRAVITY_COMMENT,
+                       Item::PRIVATE, Protocol::ACTIVITYPUB,
+                       Protocol::OSTATUS, Protocol::DFRN, Protocol::DIASPORA];
+
+               if ($filter === 'comments') {
+                       $condition[0] .= " AND `object-type` = ? ";
+                       $condition[] = Activity\ObjectType::COMMENT;
+               }
+
+               if ($owner['account-type'] != User::ACCOUNT_TYPE_COMMUNITY) {
+                       $condition[0] .= " AND `contact-id` = ? AND `author-id` = ?";
+                       $condition[] = $owner["id"];
+                       $condition[] = $authorid;
+               }
+
+               $params = ['order' => ['received' => true], 'limit' => $max_items];
+
+               if ($filter === 'posts') {
+                       $ret = Item::selectThread([], $condition, $params);
+               } else {
+                       $ret = Item::select([], $condition, $params);
+               }
+
+               $items = Item::inArray($ret);
+
+               $doc = new DOMDocument('1.0', 'utf-8');
+               $doc->formatOutput = true;
+
+               $root = self::addHeader($doc, $owner, $filter);
+
+               foreach ($items as $item) {
+                       $entry = self::entry($doc, $item, $owner);
+                       $root->appendChild($entry);
+
+                       if ($last_update < $item['created']) {
+                               $last_update = $item['created'];
+                       }
+               }
+
+               $feeddata = trim($doc->saveXML());
+
+               $msg = ['feed' => $feeddata, 'last_update' => $last_update];
+               DI::cache()->set($cachekey, $msg, Duration::QUARTER_HOUR);
+
+               Logger::info('Feed duration', ['seconds' => number_format(microtime(true) - $stamp, 3), 'nick' => $owner_nick, 'filter' => $filter, 'created' => $previous_created]);
+
+               return $feeddata;
+       }
+
+       /**
+        * Adds the header elements to the XML document
+        *
+        * @param DOMDocument $doc       XML document
+        * @param array       $owner     Contact data of the poster
+        * @param string      $filter    The related feed filter (activity, posts or comments)
+        *
+        * @return object header root element
+        * @throws \Friendica\Network\HTTPException\InternalServerErrorException
+        */
+       private static function addHeader(DOMDocument $doc, array $owner, $filter)
+       {
+               $root = $doc->createElementNS(ActivityNamespace::ATOM1, 'feed');
+               $doc->appendChild($root);
+
+               $title = '';
+               $selfUri = '/feed/' . $owner["nick"] . '/';
+               switch ($filter) {
+                       case 'activity':
+                               $title = DI::l10n()->t('%s\'s timeline', $owner['name']);
+                               $selfUri .= $filter;
+                               break;
+                       case 'posts':
+                               $title = DI::l10n()->t('%s\'s posts', $owner['name']);
+                               break;
+                       case 'comments':
+                               $title = DI::l10n()->t('%s\'s comments', $owner['name']);
+                               $selfUri .= $filter;
+                               break;
+               }
+
+               $attributes = ["uri" => "https://friendi.ca", "version" => FRIENDICA_VERSION . "-" . DB_UPDATE_VERSION];
+               XML::addElement($doc, $root, "generator", FRIENDICA_PLATFORM, $attributes);
+               XML::addElement($doc, $root, "id", DI::baseUrl() . "/profile/" . $owner["nick"]);
+               XML::addElement($doc, $root, "title", $title);
+               XML::addElement($doc, $root, "subtitle", sprintf("Updates from %s on %s", $owner["name"], DI::config()->get('config', 'sitename')));
+               XML::addElement($doc, $root, "logo", $owner["photo"]);
+               XML::addElement($doc, $root, "updated", DateTimeFormat::utcNow(DateTimeFormat::ATOM));
+
+               $author = self::addAuthor($doc, $owner);
+               $root->appendChild($author);
+
+               $attributes = ["href" => $owner["url"], "rel" => "alternate", "type" => "text/html"];
+               XML::addElement($doc, $root, "link", "", $attributes);
+
+               OStatus::hublinks($doc, $root, $owner["nick"]);
+
+               $attributes = ["href" => DI::baseUrl() . $selfUri, "rel" => "self", "type" => "application/atom+xml"];
+               XML::addElement($doc, $root, "link", "", $attributes);
+
+               return $root;
+       }
+
+       /**
+        * Adds the author element to the XML document
+        *
+        * @param DOMDocument $doc          XML document
+        * @param array       $owner        Contact data of the poster
+        *
+        * @return \DOMElement author element
+        * @throws \Friendica\Network\HTTPException\InternalServerErrorException
+        */
+       private static function addAuthor(DOMDocument $doc, array $owner)
+       {
+               $author = $doc->createElement("author");
+               XML::addElement($doc, $author, "uri", $owner["url"]);
+               XML::addElement($doc, $author, "name", $owner["nick"]);
+               XML::addElement($doc, $author, "email", $owner["addr"]);
+
+               return $author;
+       }
+
+       /**
+        * Adds an entry element to the XML document
+        *
+        * @param DOMDocument $doc       XML document
+        * @param array       $item      Data of the item that is to be posted
+        * @param array       $owner     Contact data of the poster
+        * @param bool        $toplevel  optional default false
+        *
+        * @return \DOMElement Entry element
+        * @throws \Friendica\Network\HTTPException\InternalServerErrorException
+        * @throws \ImagickException
+        */
+       private static function entry(DOMDocument $doc, array $item, array $owner)
+       {
+               $xml = null;
+
+               $repeated_guid = OStatus::getResharedGuid($item);
+               if ($repeated_guid != "") {
+                       $xml = self::reshareEntry($doc, $item, $owner, $repeated_guid);
+               }
+
+               if ($xml) {
+                       return $xml;
+               }
+
+               return self::noteEntry($doc, $item, $owner);
+       }
+
+               /**
+        * Adds an entry element with reshared content
+        *
+        * @param DOMDocument $doc           XML document
+        * @param array       $item          Data of the item that is to be posted
+        * @param array       $owner         Contact data of the poster
+        * @param string      $repeated_guid guid
+        * @param bool        $toplevel      Is it for en entry element (false) or a feed entry (true)?
+        *
+        * @return bool Entry element
+        * @throws \Friendica\Network\HTTPException\InternalServerErrorException
+        * @throws \ImagickException
+        */
+       private static function reshareEntry(DOMDocument $doc, array $item, array $owner, $repeated_guid)
+       {
+               if (($item['gravity'] != GRAVITY_PARENT) && (Strings::normaliseLink($item["author-link"]) != Strings::normaliseLink($owner["url"]))) {
+                       Logger::info('Feed entry author does not match feed owner', ['owner' => $owner["url"], 'author' => $item["author-link"]]);
+               }
+
+               $entry = OStatus::entryHeader($doc, $owner, $item, false);
+
+               $condition = ['uid' => $owner["uid"], 'guid' => $repeated_guid, 'private' => [Item::PUBLIC, Item::UNLISTED],
+                       'network' => Protocol::FEDERATED];
+               $repeated_item = Item::selectFirst([], $condition);
+               if (!DBA::isResult($repeated_item)) {
+                       return false;
+               }
+
+               self::entryContent($doc, $entry, $item, self::getTitle($repeated_item), Activity::SHARE, false);
+
+               self::entryFooter($doc, $entry, $item, $owner);
+
+               return $entry;
+       }
+
+       /**
+        * Adds a regular entry element
+        *
+        * @param DOMDocument $doc       XML document
+        * @param array       $item      Data of the item that is to be posted
+        * @param array       $owner     Contact data of the poster
+        * @param bool        $toplevel  Is it for en entry element (false) or a feed entry (true)?
+        *
+        * @return \DOMElement Entry element
+        * @throws \Friendica\Network\HTTPException\InternalServerErrorException
+        * @throws \ImagickException
+        */
+       private static function noteEntry(DOMDocument $doc, array $item, array $owner)
+       {
+               if (($item['gravity'] != GRAVITY_PARENT) && (Strings::normaliseLink($item["author-link"]) != Strings::normaliseLink($owner["url"]))) {
+                       Logger::info('Feed entry author does not match feed owner', ['owner' => $owner["url"], 'author' => $item["author-link"]]);
+               }
+
+               $entry = OStatus::entryHeader($doc, $owner, $item, false);
+
+               self::entryContent($doc, $entry, $item, self::getTitle($item), '', true);
+
+               self::entryFooter($doc, $entry, $item, $owner);
+
+               return $entry;
+       }
+
+       /**
+        * Adds elements to the XML document
+        *
+        * @param DOMDocument $doc       XML document
+        * @param \DOMElement $entry     Entry element where the content is added
+        * @param array       $item      Data of the item that is to be posted
+        * @param array       $owner     Contact data of the poster
+        * @param string      $title     Title for the post
+        * @param string      $verb      The activity verb
+        * @param bool        $complete  Add the "status_net" element?
+        * @param bool        $feed_mode Behave like a regular feed for users if true
+        * @return void
+        * @throws \Friendica\Network\HTTPException\InternalServerErrorException
+        */
+       private static function entryContent(DOMDocument $doc, \DOMElement $entry, array $item, $title, $verb = "", $complete = true)
+       {
+               if ($verb == "") {
+                       $verb = OStatus::constructVerb($item);
+               }
+
+               XML::addElement($doc, $entry, "id", $item["uri"]);
+               XML::addElement($doc, $entry, "title", html_entity_decode($title, ENT_QUOTES, 'UTF-8'));
+
+               $body = OStatus::formatPicturePost($item['body']);
+
+               $body = BBCode::convert($body, false, BBCode::OSTATUS);
+
+               XML::addElement($doc, $entry, "content", $body, ["type" => "html"]);
+
+               XML::addElement($doc, $entry, "link", "", ["rel" => "alternate", "type" => "text/html",
+                                                               "href" => DI::baseUrl()."/display/".$item["guid"]]
+               );
+
+               XML::addElement($doc, $entry, "published", DateTimeFormat::utc($item["created"]."+00:00", DateTimeFormat::ATOM));
+               XML::addElement($doc, $entry, "updated", DateTimeFormat::utc($item["edited"]."+00:00", DateTimeFormat::ATOM));
+       }
+
+       /**
+        * Adds the elements at the foot of an entry to the XML document
+        *
+        * @param DOMDocument $doc       XML document
+        * @param object      $entry     The entry element where the elements are added
+        * @param array       $item      Data of the item that is to be posted
+        * @param array       $owner     Contact data of the poster
+        * @param bool        $complete  default true
+        * @return void
+        * @throws \Friendica\Network\HTTPException\InternalServerErrorException
+        */
+       private static function entryFooter(DOMDocument $doc, $entry, array $item, array $owner)
+       {
+               $mentioned = [];
+
+               if ($item['gravity'] != GRAVITY_PARENT) {
+                       $parent = Item::selectFirst(['guid', 'author-link', 'owner-link'], ['id' => $item['parent']]);
+
+                       $thrparent = Item::selectFirst(['guid', 'author-link', 'owner-link', 'plink'], ['uid' => $owner["uid"], 'uri' => $item['thr-parent']]);
+
+                       if (DBA::isResult($thrparent)) {
+                               $mentioned[$thrparent["author-link"]] = $thrparent["author-link"];
+                               $mentioned[$thrparent["owner-link"]] = $thrparent["owner-link"];
+                               $parent_plink = $thrparent["plink"];
+                       } else {
+                               $mentioned[$parent["author-link"]] = $parent["author-link"];
+                               $mentioned[$parent["owner-link"]] = $parent["owner-link"];
+                               $parent_plink = DI::baseUrl()."/display/".$parent["guid"];
+                       }
+
+                       $attributes = [
+                                       "ref" => $item['thr-parent'],
+                                       "href" => $parent_plink];
+                       XML::addElement($doc, $entry, "thr:in-reply-to", "", $attributes);
+
+                       $attributes = [
+                                       "rel" => "related",
+                                       "href" => $parent_plink];
+                       XML::addElement($doc, $entry, "link", "", $attributes);
+               }
+
+               // uri-id isn't present for follow entry pseudo-items
+               $tags = Tag::getByURIId($item['uri-id'] ?? 0);
+               foreach ($tags as $tag) {
+                       $mentioned[$tag['url']] = $tag['url'];
+               }
+
+               foreach ($tags as $tag) {
+                       if ($tag['type'] == Tag::HASHTAG) {
+                               XML::addElement($doc, $entry, "category", "", ["term" => $tag['name']]);
+                       }
+               }
+
+               OStatus::getAttachment($doc, $entry, $item);
+       }
+
+       /**
+        * Fetch or create title for feed entry
+        *
+        * @param array $item
+        * @return string title
+        */
+       private static function getTitle(array $item)
+       {
+               if ($item['title'] != '') {
+                       return BBCode::convert($item['title'], false, BBCode::OSTATUS);
+               }
+
+               // Fetch information about the post
+               $siteinfo = BBCode::getAttachedData($item["body"]);
+               if (isset($siteinfo["title"])) {
+                       return $siteinfo["title"];
+               }
+
+               // If no bookmark is found then take the first line
+               // Remove the share element before fetching the first line
+               $title = trim(preg_replace("/\[share.*?\](.*?)\[\/share\]/ism","\n$1\n",$item['body']));
+
+               $title = HTML::toPlaintext(BBCode::convert($title, false), 0, true)."\n";
+               $pos = strpos($title, "\n");
+               $trailer = "";
+               if (($pos == 0) || ($pos > 100)) {
+                       $pos = 100;
+                       $trailer = "...";
+               }
+
+               return substr($title, 0, $pos) . $trailer;
+       }
 }