From 89d5aa64baf26eef1bc252208a2477c9c9bd9844 Mon Sep 17 00:00:00 2001
From: Michael <heluecht@pirati.ca>
Date: Sat, 19 Nov 2016 20:10:29 +0000
Subject: [PATCH] Mark contacts as dead or undead while transmitting and
 receiving messages

---
 include/Contact.php  | 48 +++++++++++++++++++++++++++++++++++---------
 include/delivery.php |  7 +++++++
 include/diaspora.php | 14 +++++++++++--
 3 files changed, 57 insertions(+), 12 deletions(-)

diff --git a/include/Contact.php b/include/Contact.php
index 23b5bbe5b..949feb356 100644
--- a/include/Contact.php
+++ b/include/Contact.php
@@ -145,7 +145,6 @@ function terminate_friendship($user,$self,$contact) {
 // This provides for the possibility that their database is temporarily messed
 // up or some other transient event and that there's a possibility we could recover from it.
 
-if(! function_exists('mark_for_death')) {
 function mark_for_death($contact) {
 
 	if($contact['archive'])
@@ -156,14 +155,24 @@ function mark_for_death($contact) {
 				dbesc(datetime_convert()),
 				intval($contact['id'])
 		);
-	}
-	else {
+
+		if ($contact['url'] != '') {
+			q("UPDATE `contact` SET `term-date` = '%s'
+				WHERE `nurl` = '%s' AND `term-date` <= '1000-00-00'",
+					dbesc(datetime_convert()),
+					dbesc(normalise_link($contact['url']))
+			);
+		}
+	} else {
 
 		/// @todo
 		/// We really should send a notification to the owner after 2-3 weeks
 		/// so they won't be surprised when the contact vanishes and can take
 		/// remedial action if this was a serious mistake or glitch
 
+		/// @todo
+		/// Check for contact vitality via probing
+
 		$expiry = $contact['term-date'] . ' + 32 days ';
 		if(datetime_convert() > datetime_convert('UTC','UTC',$expiry)) {
 
@@ -171,26 +180,45 @@ function mark_for_death($contact) {
 			// archive them rather than delete
 			// though if the owner tries to unarchive them we'll start the whole process over again
 
-			q("update contact set `archive` = 1 where id = %d",
+			q("UPDATE `contact` SET `archive` = 1 WHERE `id` = %d",
 				intval($contact['id'])
 			);
-			q("UPDATE `item` SET `private` = 2 WHERE `contact-id` = %d AND `uid` = %d", intval($contact['id']), intval($contact['uid']));
-
-			//contact_remove($contact['id']);
 
+			if ($contact['url'] != '') {
+				q("UPDATE `contact` SET `archive` = 1 WHERE `nurl` = '%s'",
+					dbesc(normalise_link($contact['url']))
+				);
+			}
 		}
 	}
 
-}}
+}
 
-if(! function_exists('unmark_for_death')) {
 function unmark_for_death($contact) {
+
+	$r = q("SELECT `term-date` FROM `contact` WHERE `id` = %d AND `term-date` > '%s'",
+		intval($contact['id']),
+		dbesc('1000-00-00 00:00:00')
+	);
+
+	// We don't need to update, we never marked this contact as dead
+	if (!dbm::is_result($r)) {
+		return;
+	}
+
 	// It's a miracle. Our dead contact has inexplicably come back to life.
 	q("UPDATE `contact` SET `term-date` = '%s' WHERE `id` = %d",
 		dbesc('0000-00-00 00:00:00'),
 		intval($contact['id'])
 	);
-}}
+
+	if ($contact['url'] != '') {
+		q("UPDATE `contact` SET `term-date` = '%s' WHERE `nurl` = '%s'",
+			dbesc('0000-00-00 00:00:00'),
+			dbesc(normalise_link($contact['url']))
+		);
+	}
+}
 
 /**
  * @brief Get contact data for a given profile link
diff --git a/include/delivery.php b/include/delivery.php
index 7c0ba63a6..8fce98774 100644
--- a/include/delivery.php
+++ b/include/delivery.php
@@ -381,7 +381,14 @@ function delivery_run(&$argv, &$argc){
 				if ($deliver_status == (-1)) {
 					logger('notifier: delivery failed: queuing message');
 					add_to_queue($contact['id'],NETWORK_DFRN,$atom);
+
+					// The message could not be delivered. We mark the contact as "dead"
+					mark_for_death($contact);
+				} else {
+					// We successfully delivered a message, the contact is alive
+					unmark_for_death($contact);
 				}
+
 				break;
 
 			case NETWORK_OSTATUS:
diff --git a/include/diaspora.php b/include/diaspora.php
index 10f1be93d..f2d484867 100644
--- a/include/diaspora.php
+++ b/include/diaspora.php
@@ -999,17 +999,21 @@ class diaspora {
 	 */
 	private function author_contact_by_url($contact, $person, $uid) {
 
-		$r = q("SELECT `id`, `network` FROM `contact` WHERE `nurl` = '%s' AND `uid` = %d LIMIT 1",
+		$r = q("SELECT `id`, `network`, `url` FROM `contact` WHERE `nurl` = '%s' AND `uid` = %d LIMIT 1",
 			dbesc(normalise_link($person["url"])), intval($uid));
 		if ($r) {
 			$cid = $r[0]["id"];
 			$network = $r[0]["network"];
+
+			// We are receiving content from a user that is about to be terminated
+			// This means the user is vital, so we remove a possible termination date.
+			unmark_for_death($contact);
 		} else {
 			$cid = $contact["id"];
 			$network = NETWORK_DIASPORA;
 		}
 
-		return (array("cid" => $cid, "network" => $network));
+		return array("cid" => $cid, "network" => $network);
 	}
 
 	/**
@@ -2633,7 +2637,13 @@ class diaspora {
 			} else {
 				// queue message for redelivery
 				add_to_queue($contact["id"], NETWORK_DIASPORA, $slap, $public_batch);
+
+				// The message could not be delivered. We mark the contact as "dead"
+				mark_for_death($contact);
 			}
+		} elseif (($return_code >= 200) AND ($return_code <= 299)) {
+			// We successfully delivered a message, the contact is alive
+			unmark_for_death($contact);
 		}
 
 		return(($return_code) ? $return_code : (-1));