From 3c027699a5e2c25a2dcfa7e192f7e0089c0592e8 Mon Sep 17 00:00:00 2001
From: Michael <heluecht@pirati.ca>
Date: Fri, 12 Jan 2018 20:52:43 +0000
Subject: [PATCH] Receive participation messages and processes them

---
 boot.php                     |  2 +-
 src/Database/DBStructure.php | 10 +++++
 src/Protocol/Diaspora.php    | 77 +++++++++++++++++++++++++++++++++++-
 src/Worker/Notifier.php      |  8 +++-
 4 files changed, 93 insertions(+), 4 deletions(-)

diff --git a/boot.php b/boot.php
index b10ba7a63f..51594b2172 100644
--- a/boot.php
+++ b/boot.php
@@ -43,7 +43,7 @@ define('FRIENDICA_PLATFORM',     'Friendica');
 define('FRIENDICA_CODENAME',     'Asparagus');
 define('FRIENDICA_VERSION',      '3.6-dev');
 define('DFRN_PROTOCOL_VERSION',  '2.23');
-define('DB_UPDATE_VERSION',      1240);
+define('DB_UPDATE_VERSION',      1241);
 define('NEW_UPDATE_ROUTINE_VERSION', 1170);
 
 /**
diff --git a/src/Database/DBStructure.php b/src/Database/DBStructure.php
index 11bf40aec4..6ceeb573fe 100644
--- a/src/Database/DBStructure.php
+++ b/src/Database/DBStructure.php
@@ -1299,6 +1299,16 @@ class DBStructure {
 						"created" => array("created"),
 						)
 				);
+		$database["participation"] = array(
+				"fields" => array(
+						"item" => array("type" => "int(10) unsigned", "not null" => "1", "primary" => "1", "relation" => array("item" => "id")),
+						"contact" => array("type" => "int(10) unsigned", "not null" => "1", "relation" => array("contact" => "id")),
+						"server" => array("type" => "varchar(60)", "not null" => "1", "primary" => "1"),
+						),
+				"indexes" => array(
+						"PRIMARY" => array("item", "server")
+						)
+				);
 		$database["pconfig"] = array(
 				"fields" => array(
 						"id" => array("type" => "int(11)", "not null" => "1", "extra" => "auto_increment", "primary" => "1"),
diff --git a/src/Protocol/Diaspora.php b/src/Protocol/Diaspora.php
index 23220d04cd..49134e2220 100644
--- a/src/Protocol/Diaspora.php
+++ b/src/Protocol/Diaspora.php
@@ -99,6 +99,54 @@ class Diaspora
 		return $relay;
 	}
 
+	/**
+	 * @brief Return a list of participating contacts for a thread
+	 *
+	 * This is used for the participation feature.
+	 * One of the parameters is a contact array.
+	 * This is done to avoid duplicates.
+	 *
+	 * @param integer $thread   The id of the thread
+	 * @param array   $contacts The previously fetched contacts
+	 *
+	 * @return array of relay servers
+	 */
+	public static function ParticipationsForThread($thread, $contacts)
+	{
+		$relais = q("SELECT `batch`, `id`, `name`,`network` FROM `contact` WHERE `uid` = 0 AND `batch` = '%s' LIMIT 1", dbesc($batch));
+		$r = dba::p("SELECT `contact`.`batch`, `contact`.`id`, `contact`.`name`, `contact`.`network`,
+				`fcontact`.`batch` AS `fbatch`, `fcontact`.`network` AS `fnetwork` FROM `participation`
+				INNER JOIN `contact` ON `contact`.`id` = `participation`.`contact`
+				LEFT JOIN `fcontact` ON `fcontact`.`url` = `contact`.`url`
+				WHERE `participation`.`item` = ?", $thread);
+
+		while ($contact = dba::fetch($r)) {
+			if (!empty($contact['fnetwork'])) {
+				$contact['network'] = $contact['fnetwork'];
+			}
+			unset($contact['fnetwork']);
+
+			if (empty($contact['batch']) && !empty($contact['fbatch'])) {
+				$contact['batch'] = $contact['fbatch'];
+			}
+			unset($contact['fbatch']);
+
+			$exists = false;
+			foreach ($contacts as $entry) {
+				if ($entry['batch'] == $contact['batch']) {
+					$exists = true;
+				}
+			}
+
+			if (!$exists) {
+				$contacts[] = $contact;
+			}
+		}
+		dba::close($r);
+
+		return $contacts;
+	}
+
 	/**
 	 * @brief repairs a signature that was double encoded
 	 *
@@ -542,7 +590,7 @@ class Diaspora
 			case "message":
 				return self::receiveMessage($importer, $fields);
 
-			case "participation": // Not implemented
+			case "participation":
 				return self::receiveParticipation($importer, $fields);
 
 			case "photo": // Not implemented
@@ -2128,7 +2176,32 @@ class Diaspora
 	 */
 	private static function receiveParticipation($importer, $data)
 	{
-		// I'm not sure if we can fully support this message type
+		$author = strtolower(notags(unxmlify($data->author)));
+		$parent_guid = notags(unxmlify($data->parent_guid));
+
+		$contact_id = Contact::getIdForURL($author);
+		if (!$contact_id) {
+			logger('Author not found: '.$author);
+			return false;
+		}
+
+		$item = dba::selectFirst('item', ['id'], ['guid' => $parent_guid, 'origin' => true, 'private' => false]);
+		if (!DBM::is_result($item)) {
+			logger('Item not found: '.$parent_guid);
+			return false;
+		}
+
+		$author_parts = explode('@', $author);
+		if (isset($author_parts[1])) {
+			$server = $author_parts[1];
+		} else {
+			// Should never happen
+			$server = $author;
+		}
+
+		logger('Received participation for ID: '.$item['id'].' - Contact: '.$contact_id.' - Server: '.$server);
+		dba::insert('participation', ['item' => $item['id'], 'contact' => $contact_id, 'server' => $server]);
+
 		return true;
 	}
 
diff --git a/src/Worker/Notifier.php b/src/Worker/Notifier.php
index 710bcfa13b..da6d45084e 100644
--- a/src/Worker/Notifier.php
+++ b/src/Worker/Notifier.php
@@ -522,6 +522,11 @@ class Notifier {
 					intval($owner['uid']),
 					intval(CONTACT_IS_SHARING)
 				);
+
+				// Fetch the participation list
+				// The function will ensure that there are no duplicates
+				$r1 = Diaspora::ParticipationsForThread($item_id, $r1);
+
 			}
 
 			$r2 = q("SELECT `id`, `name`,`network` FROM `contact`
@@ -531,7 +536,8 @@ class Notifier {
 				intval(CONTACT_IS_SHARING)
 			);
 
-			$r = array_merge($r2,$r1,$r0);
+
+			$r = array_merge($r2, $r1, $r0);
 
 			if (DBM::is_result($r)) {
 				logger('pubdeliver '.$target_item["guid"].': '.print_r($r,true), LOGGER_DEBUG);