first shot at getting like/unlike functions to work consistently

1 files changed, 111 insertions, 2 deletions

diff --git a/mod/like.php b/mod/like.php
index 6b97fafb5..06d27659b 100644
--- a/mod/like.php
+++ b/mod/like.php
@@ -104,6 +104,7 @@ function like_content(&$a) {
 		return;
 	}
 
+
 	$r = q("SELECT `id` FROM `item` WHERE `verb` = '%s' AND `deleted` = 0 
 		AND `contact-id` = %d AND ( `parent` = '%s' OR `parent-uri` = '%s') LIMIT 1",
 		dbesc($activity),
@@ -118,7 +119,58 @@ function like_content(&$a) {
 			intval($r[0]['id'])
 		);
 
-		proc_run('php',"include/notifier.php","like","$post_id");
+		// Clean up the `sign` table
+		$r2 = q("DELETE FROM `sign` WHERE `iid` = %d",
+			intval($r[0]['id'])
+		);
+
+		// Save the author information for the unlike in case we need to relay to Diaspora
+		// Note that we can only create a signature for a user of the local server. We don't have
+		// a key for remote users. That is ok, because if a remote user is "unlike"ing a post, it 
+		// means we are the relay, and for relayable_retractions, Diaspora
+		// only checks the parent_author_signature if it doesn't have to relay further
+		//
+		// If $item['resource-id'] exists, it means the item is a photo. Diaspora doesn't support
+		// likes on photos, so don't bother.
+
+		if(($activity === ACTIVITY_LIKE) && (! $item['resource-id'])) {
+			$signed_text = $r[0]['guid'] . ';' . 'Like';
+
+			if( contact['network'] === NETWORK_DIASPORA)
+				$diaspora_handle = $contact['addr'];
+			else { // Only works for NETWORK_DFRN
+				$contact_baseurl = substr($contact['url'], strpos($contact['url'],'://') + 3, strpos($contact['url'],'/profile') - 1);
+				$diaspora_handle = $contact['nick'] . '@' . $contact_baseurl;
+
+				// Get contact's private key if he's a user of the local Friendica server
+				$r2 = q("SELECT `contact`.`uid` FROM `contact` WHERE `url` = '%s' AND `self` = 1 LIMIT 1",
+					dbesc(contact['url'])
+				);
+
+				if( $r2) {
+					$contact_uid = $r2['uid'];
+					$r2 = q("SELECT prvkey FROM user WHERE id = %d LIMIT 1",
+						intval($contact_uid)
+					);
+
+					if( $r2)
+						$authorsig = base64_encode(rsa_sign($signed_text,$r2['prvkey'],'sha256'));
+				}
+			}
+
+			if(! isset($authorsig))
+				$authorsig = '';
+
+			q("insert into sign (`retract_iid`,`signed_text`,`signature`,`signer`) values (%d,'%s','%s','%s') ",
+				intval($r[0]['id']),
+				dbesc($signed_text),
+				dbesc($authorsig),
+				dbesc($diaspora_handle)
+			);
+		}
+
+//		proc_run('php',"include/notifier.php","like","$post_id"); // $post_id isn't defined here!
+		proc_run('php',"include/notifier.php","like","$r[0]['id']");
 		return;
 	}
 
@@ -191,6 +243,63 @@ EOT;
 		);
 	}			
 
+
+	// Save the author information for the like in case we need to relay to Diaspora
+	// Note that we can only create a signature for a user of the local server. We don't have
+	// a key for remote users. That is ok, because if a remote user is "unlike"ing a post, it 
+	// means we are the relay, and for relayable_retractions, Diaspora
+	// only checks the parent_author_signature if it doesn't have to relay further
+
+	if(($activity === ACTIVITY_LIKE) && ($post_type === t('status'))) {
+		if( contact['network'] === NETWORK_DIASPORA)
+			$diaspora_handle = $contact['addr'];
+		else { // Only works for NETWORK_DFRN
+			$contact_baseurl = substr($contact['url'], strpos($contact['url'],'://') + 3, strpos($contact['url'],'/profile') - 1);
+			$diaspora_handle = $contact['nick'] . '@' . $contact_baseurl;
+
+			// Get contact's private key if he's a user of the local Friendica server
+			$r2 = q("SELECT `contact`.`uid` FROM `contact` WHERE `url` = '%s' AND `self` = 1 LIMIT 1",
+				dbesc(contact['url'])
+			);
+
+			if( $r2) {
+				$contact_uid = $r2['uid'];
+				$r2 = q("SELECT prvkey FROM user WHERE id = %d LIMIT 1",
+					intval($contact_uid)
+				);
+
+				if( $r2)
+					$contact_uprvkey = $r2['prvkey'];
+			}
+		}
+
+		$r = q("SELECT guid, parent FROM `item` WHERE id = %d LIMIT 1",
+			intval($post_id)
+		);
+		if( $r) {
+			$p = q("SELECT guid FROM `item` WHERE id = %d AND parent = %d LIMIT 1",
+				intval($r[0]['parent'),
+				intval($r[0]['parent')
+			);
+			if( $p) {
+				$signed_text = $r[0]['guid'] . ';Post;' . $p[0]['guid'] . ';true;' . $diaspora_handle;
+
+				if(isset($contact_uprvkey))
+					$authorsig = base64_encode(rsa_sign($signed_text,$contact_uprvkey,'sha256'));
+				else
+					$authorsig = '';
+
+				q("insert into sign (`iid`,`signed_text`,`signature`,`signer`) values (%d,'%s','%s','%s') ",
+					intval($post_id),
+					dbesc($signed_text),
+					dbesc($authorsig),
+					dbesc($diaspora_handle)
+				);
+			}
+		}
+	}
+
+
 	$arr['id'] = $post_id;
 
 	call_hooks('post_local_end', $arr);
@@ -199,4 +308,4 @@ EOT;
 
 	killme();
 //	return; // NOTREACHED
-}
\ No newline at end of file
+}