Fix bugs in the retraction code

Currently, the following seems to be the functional status:
	For a Diaspora top-level post:
		Friendica comments show up AND delete
		Diaspora comments show up AND delete for top-level owner
		Diaspora comments show up for non-owner
		Diaspora comments sometimes don't delete for non-owner
			-> Appears to be Diaspora's fault, as a "not a valid object" error shows up in the log

		Friendica likes show up, but can't unlike (Friendica doesn't even message Diaspora)
		Diaspora likes show up
		Diaspora non-owner can't unlike
			-> Same as comments, seems to be Diaspora's fault

	For a Friendica top-level post:
		Friendica comments show up AND delete
		Diaspora comments show up AND delete

		Friendica likes don't show up in Diaspora sometimes
		Friendica doesn't even message Diaspora for unlikes (sometimes?)
		Diaspora likes and unlikes work

include/delivery.php

@@ -509,13 +509,13 @@ function delivery_run($argv, $argc){
 					// unsupported
 					break;
 				}
-				elseif(($target_item['deleted']) && ($top_level) && ($target_item['verb'] !== ACTIVITY_LIKE)) {
+				elseif(($target_item['deleted']) && ($target_item['uri'] === $target_item['parent-uri']) && ($target_item['verb'] !== ACTIVITY_LIKE)) {
 				logger('delivery: diaspora retract: ' . $loc);
 					// diaspora delete, 
 					diaspora_send_retraction($target_item,$owner,$contact,$public_message);
 					break;
 				}
-				elseif($target_item['parent'] != $target_item['id']) {
+				elseif($target_item['uri'] !== $target_item['parent-uri']) {
 
 				logger('delivery: diaspora relay: ' . $loc);
 

include/diaspora.php

@@ -1168,22 +1168,7 @@ function diaspora_comment($importer,$xml,$msg) {
 		);
 	}
 
-	if(($parent_item['origin']) && (! $parent_author_signature)) {	if(($parent_item['origin']) && (! $parent_author_signature)) {
-		q("insert into sign (`iid`,`signed_text`,`signature`,`signer`) values (%d,'%s','%s','%s') ",
-			intval($message_id),
-			dbesc($author_signed_data),
-			dbesc(base64_encode($author_signature)),
-			dbesc($diaspora_handle)
-		);
-
-		// if the message isn't already being relayed, notify others
-		// the existence of parent_author_signature means the parent_author or owner
-		// is already relaying.
-
-		proc_run('php','include/notifier.php','comment',$message_id);
-	}
-
-
+	if(($parent_item['origin']) && (! $parent_author_signature)) {
 		q("insert into sign (`iid`,`signed_text`,`signature`,`signer`) values (%d,'%s','%s','%s') ",
 			intval($message_id),
 			dbesc($author_signed_data),
@@ -1846,7 +1831,7 @@ function diaspora_signed_retraction($importer,$xml,$msg) {
 
 	}
 
-	if($type === 'StatusMessage' || $type === 'Comment') {
+	if($type === 'StatusMessage' || $type === 'Comment' || $type === 'Like') {
 		$r = q("select * from item where guid = '%s' and uid = %d and not file like '%%[%%' limit 1",
 			dbesc($guid),
 			intval($importer['uid'])
@@ -1854,6 +1839,7 @@ function diaspora_signed_retraction($importer,$xml,$msg) {
 		if(count($r)) {
 			if(link_compare($r[0]['author-link'],$contact['url'])) {
 				q("update item set `deleted` = 1, `edited` = '%s', `changed` = '%s', `body` = '' , `title` = '' where `id` = %d limit 1",
+					dbesc(datetime_convert()),			
 					dbesc(datetime_convert()),			
 					intval($r[0]['id'])
 				);
@@ -2184,16 +2170,6 @@ function diaspora_send_relay($item,$owner,$contact,$public_batch = false) {
 // I'm assuming for now that "$owner" will be the user of the top-level post for retractions too. Be
 // aware that another reasonable possibility is that it's the "$owner" of the deleted comment.
 
-// TODO
-// CHECK	1. If we receive a retraction from Diaspora to be relayed by us, we need to insert the signature
-//    		   into the DB and call notifier.php
-// CHECK	2. diaspora_send_retraction() needs to be modified to send
-//    		   Diaspora a retraction for it to relay when appropriate
-// CHECK	3. notifier.php (and delivery.php?) need to be modified to call the right functions for the right
-//    		   retraction situation
-// 4. If possible, modify notifier.php (and delivery.php?) to remove the relayable retraction's signature
-//    from the DB after finishing with relaying retractions
-
 
 
 	$a = get_app();
@@ -2216,20 +2192,20 @@ function diaspora_send_relay($item,$owner,$contact,$public_batch = false) {
 	$like = false;
 	$relay_retract = false;
 	$sql_sign_id = 'iid';
-	if($item['verb'] === ACTIVITY_LIKE) {
+	if( $item['deleted']) {
+		$tpl = get_markup_template('diaspora_relayable_retraction.tpl');
+		$relay_retract = true;
+		$sql_sign_id = 'retract_iid';
+		$target_type = ( ($item['verb'] === ACTIVITY_LIKE) ? 'Like' : 'Comment');
+	}
+	elseif($item['verb'] === ACTIVITY_LIKE) {
 		$tpl = get_markup_template('diaspora_like_relay.tpl');
 		$like = true;
 		$target_type = 'Post';
 		$positive = (($item['deleted']) ? 'false' : 'true');
 	}
-	elseif(! $item['deleted']) {
-		$tpl = get_markup_template('diaspora_comment_relay.tpl');
-	}
 	else {
-		$tpl = get_markup_template('diaspora_relayable_retraction.tpl');
-		$relay_retract = true;
-		$sql_sign_id = 'retract_iid';
-		$target_type = 'Comment';
+		$tpl = get_markup_template('diaspora_comment_relay.tpl');
 	}
 
 	$body = $item['body'];

include/items.php

@@ -3281,33 +3281,33 @@ function drop_item($id,$interactive = true) {
 			}
 
 			// Add a relayable_retraction signature for Diaspora. Note that we can't add a target_author_signature
-			// if the comment was deleted by a remote user. That should be ok, because if a remote user is deleting
-			// the comment, that means we're the home of the post, and Diaspora will only
+			// if the comment/like was deleted by a remote user. That should be ok, because if a remote user is deleting
+			// the comment/like, that means we're the home of the post, and Diaspora will only
 			// check the parent_author_signature of retractions that it doesn't have to relay further
-			if( strcmp($item['type'], 'activity') != 0) {
-				$signed_text = $item['guid'] . ';' . 'Comment';
+			$signed_text = $item['guid'] . ';' . ( ($item['verb'] === ACTIVITY_LIKE) ? 'Like' : 'Comment');
 
-				if(local_user() == $item['uid']) {
+			if(local_user() == $item['uid']) {
 
-					$handle = $a->user['nickname'] . '@' . substr($a->get_baseurl(), strpos($a->get_baseurl(),'://') + 3);
-					$authorsig = base64_encode(rsa_sign($signed_text,$a->user['prvkey'],'sha256'));
-				}
-				else {
-					$r = q("SELECT `nick`, `url` FROM `contact` WHERE `id` = '%d' LIMIT 1",
-						$item['contact-id']
-					);
-					if(count($r))
-						$handle = $r['nick'] . '@' . substr($r['url'], strpos($r['url'],'://') + 3, strpos($r['url'],'/profile') - 1);
+				$handle = $a->user['nickname'] . '@' . substr($a->get_baseurl(), strpos($a->get_baseurl(),'://') + 3);
+				$authorsig = base64_encode(rsa_sign($signed_text,$a->user['prvkey'],'sha256'));
+			}
+			else {
+				$r = q("SELECT `nick`, `url` FROM `contact` WHERE `id` = '%d' LIMIT 1",
+					$item['contact-id']
+				);
+				if(count($r)) {
+					$handle = $r['nick'] . '@' . substr($r['url'], strpos($r['url'],'://') + 3, strpos($r['url'],'/profile') - 1);
+					$authorsig = '';
 				}
-
-				if(isset($handle)
-					q("insert into sign (`retract_iid`,`signed_text`,`signature`,`signer`) values (%d,'%s','%s','%s') ",
-						intval($item['id']),
-						dbesc($signed_text),
-						dbesc($authorsig),
-						dbesc($handle)
-					);
 			}
+
+			if(isset($handle))
+				q("insert into sign (`retract_iid`,`signed_text`,`signature`,`signer`) values (%d,'%s','%s','%s') ",
+					intval($item['id']),
+					dbesc($signed_text),
+					dbesc($authorsig),
+					dbesc($handle)
+				);
 		}
 		$drop_id = intval($item['id']);
 

include/notifier.php

@@ -738,7 +738,7 @@ function notifier_run($argv, $argc){
 						// unsupported
 						break;
 					}
-					elseif(($target_item['deleted']) && ($top_level || $followup) && ($target_item['verb'] !== ACTIVITY_LIKE)) {
+					elseif(($target_item['deleted']) && (($target_item['uri'] === $target_item['parent-uri']) || $followup) && ($target_item['verb'] !== ACTIVITY_LIKE)) {
 						// diaspora delete, including relayable_retractions that need to be relayed
 						diaspora_send_retraction($target_item,$owner,$contact);
 						break;
@@ -748,7 +748,7 @@ function notifier_run($argv, $argc){
 						diaspora_send_followup($target_item,$owner,$contact);
 						break;
 					}
-					elseif($target_item['parent'] != $target_item['id']) {
+					elseif($target_item['uri'] !== $target_item['parent-uri']) {
 						// we are the relay - send comments, likes, unlikes and relayable_retractions to our conversants
 						diaspora_send_relay($target_item,$owner,$contact);
 						break;

update.php

@@ -1276,7 +1276,7 @@ function update_1146() {
 
 /*
 function update_xxxx() {
-	$r1 = q("ALTER TABLE `sign` MODIFY `iid` SET DEFAULT '0'");
+	$r1 = q("ALTER TABLE `sign` ALTER `iid` SET DEFAULT '0'");
 	$r2 = q("ALTER TABLE `sign` ADD `retract_iid` INT(10) UNSIGNED NOT NULL DEFAULT '0' AFTER `iid`");
 	$r3 = q("ALTER TABLE `sign` ADD INDEX ( `retract_iid` )");  
 	if((! $r1) || (! $r2) || (! $r3))

view/diaspora_like_relay.tpl

@@ -5,9 +5,9 @@
       <target_type>$target_type</target_type>
       <parent_guid>$parent_guid</parent_guid>
       <parent_author_signature>$parentsig</parent_author_signature>
-      <author_signature>$authrosig</author_signature>
+      <author_signature>$authorsig</author_signature>
       <positive>$positive</positive>
       <diaspora_handle>$handle</diaspora_handle>
     </like>
   </post>
-</XML>
+</XML>

view/diaspora_relayable_retraction.tpl

@@ -3,7 +3,7 @@
     <relayable_retraction>
       <target_type>$target_type</target_type>
       <target_guid>$guid</target_guid>
-      <parent_author_signature>$parentauthorsig</parent_author_signature>
+      <parent_author_signature>$parentsig</parent_author_signature>
       <target_author_signature>$authorsig</target_author_signature>
       <sender_handle>$handle</sender_handle>
     </relayable_retraction>