From 64be91148a881f65224c583b92c407205db24634 Mon Sep 17 00:00:00 2001
From: dave <dave@36083f99-b078-4883-b0ff-0f9b5a30f544>
Date: Sun, 21 Mar 2010 16:22:19 +0000
Subject: generic like this functionality added

git-svn-id: http://code.elgg.org/elgg/trunk@5456 36083f99-b078-4883-b0ff-0f9b5a30f544
---
 actions/likes/add.php                     | 64 +++++++++++++++++++++++++++++++
 actions/likes/delete.php                  | 32 ++++++++++++++++
 engine/lib/annotations.php                | 23 +++++++++++
 engine/lib/elgglib.php                    | 35 ++++++++++++++++-
 languages/en.php                          | 15 ++++++++
 views/default/annotation/annotatelike.php | 11 ++++++
 views/default/annotation/likes.php        | 39 +++++++++++++++++++
 views/default/likes/forms/edit.php        | 30 +++++++++++++++
 8 files changed, 248 insertions(+), 1 deletion(-)
 create mode 100644 actions/likes/add.php
 create mode 100644 actions/likes/delete.php
 create mode 100644 views/default/annotation/annotatelike.php
 create mode 100644 views/default/annotation/likes.php
 create mode 100644 views/default/likes/forms/edit.php

diff --git a/actions/likes/add.php b/actions/likes/add.php
new file mode 100644
index 000000000..36672d3ec
--- /dev/null
+++ b/actions/likes/add.php
@@ -0,0 +1,64 @@
+<?php
+/**
+ * Elgg add like action
+ *
+ * @package Elgg
+ * @author Curverider <curverider.co.uk>
+ * @link http://elgg.org/
+ */
+
+// Make sure we're logged in; forward to the front page if not
+gatekeeper();
+
+// Get input
+$entity_guid = (int) get_input('guid');
+//check to see if the user has already liked the item
+if(elgg_already_created_annotation($entity_guid, 'likes')){
+	system_message(elgg_echo("likes:alreadyliked"));
+	forward($_SERVER['HTTP_REFERER']);
+}
+// Let's see if we can get an entity with the specified GUID
+$entity = get_entity($entity_guid);
+if (!$entity) {
+	register_error(elgg_echo("likes:notfound"));
+	forward($_SERVER['HTTP_REFERER']);
+}
+
+$user = get_loggedin_user();
+$annotation = create_annotation($entity->guid, 
+								'likes',
+								"likes", 
+								"", 
+								$user->guid, 
+								$entity->access_id);
+
+// tell user annotation didn't work if that is the case
+if (!$annotation) {
+	register_error(elgg_echo("likes:failure"));
+	forward($_SERVER['HTTP_REFERER']);
+}
+
+// notify if poster wasn't owner
+if ($entity->owner_guid != $user->guid) {
+			
+	notify_user($entity->owner_guid,
+				$user->guid,
+				elgg_echo('likes:email:subject'),
+				sprintf(
+					elgg_echo('likes:email:body'),
+					$entity->title,
+					$user->name,
+					$comment_text,
+					$entity->getURL(),
+					$user->name,
+					$user->getURL()
+				)
+			);
+}
+
+system_message(elgg_echo("likes:likes"));
+//add to river
+add_to_river('annotation/annotatelike','likes',$user->guid,$entity->guid, "", 0, $annotation);
+
+// Forward back to the page where the user 'liked' the object
+forward($_SERVER['HTTP_REFERER']);
diff --git a/actions/likes/delete.php b/actions/likes/delete.php
new file mode 100644
index 000000000..cbb89f67a
--- /dev/null
+++ b/actions/likes/delete.php
@@ -0,0 +1,32 @@
+<?php
+/**
+ * Elgg delete like action
+ *
+ * @package Elgg
+ * @author Curverider <curverider.co.uk>
+ * @link http://elgg.org/
+ */
+
+// Ensure we're logged in
+if (!isloggedin()) {
+	forward();
+}
+
+// Make sure we can get the comment in question
+$annotation_id = (int) get_input('annotation_id');
+if ($likes = get_annotation($annotation_id)) {
+
+	$entity = get_entity($likes->entity_guid);
+
+	if ($likes->canEdit()) {
+		$likes->delete();
+		system_message(elgg_echo("likes:deleted"));
+		forward($entity->getURL());
+	}
+
+} else {
+	$url = "";
+}
+
+register_error(elgg_echo("likes:notdeleted"));
+forward($entity->getURL());
\ No newline at end of file
diff --git a/engine/lib/annotations.php b/engine/lib/annotations.php
index b18475d57..b7dc1b9d3 100644
--- a/engine/lib/annotations.php
+++ b/engine/lib/annotations.php
@@ -1250,6 +1250,29 @@ function get_annotation_url($id) {
 	return false;
 }
 
+/**
+ * Check to see if a user has already created an annotation on an object
+ *
+ * @param ElggEntity $entity
+ * @return true | false
+ */
+function elgg_already_created_annotation($entity_guid, $annotation_type) {
+	global $CONFIG;
+	$entity_guid = (int)$entity_guid;
+	$annotation_type = sanitise_string($annotation_type);
+	$owner_guid = get_loggedin_userid();
+	$sql = "select a.id" .
+	 		" FROM {$CONFIG->dbprefix}annotations a, {$CONFIG->dbprefix}metastrings m " .
+	 		" WHERE a.owner_guid={$owner_guid} AND a.entity_guid={$entity_guid} " . 
+	 		" AND a.name_id=m.id AND m.string='{$annotation_type}'";
+	//get the annotation type id
+	$check_annotation = get_data_row($sql);
+	//check to see if the user has already liked
+	if($check_annotation)
+		return true;
+	else
+		return false;
+}
 
 /**
  * Register an annotation url handler.
diff --git a/engine/lib/elgglib.php b/engine/lib/elgglib.php
index 7691ca5bb..fb61b7d10 100644
--- a/engine/lib/elgglib.php
+++ b/engine/lib/elgglib.php
@@ -1002,7 +1002,38 @@ function get_submenu() {
 
 	return $submenu_total;
 }
-
+/**
+ * Automatically views likes and a like input relating to the given entity
+ *
+ * @param ElggEntity $entity The entity to like
+ * @return string|false The HTML (etc) for the likes, or false on failure
+ */
+function elgg_view_likes($entity){
+	if (!($entity instanceof ElggEntity)) {
+		return false;
+	}
+	if ($likes = trigger_plugin_hook('likes',$entity->getType(),array('entity' => $entity),false)) {
+		return $likes;
+	} else {
+		//display the form
+		$likes = elgg_view('likes/forms/edit',array('entity' => $entity));
+		return $likes;
+	}
+}
+/**
+ * Count the number of likes attached to an entity
+ *
+ * @param ElggEntity $entity
+ * @return int Number of likes
+ */
+function elgg_count_likes($entity) {
+	if ($likeno = trigger_plugin_hook('likes:count', $entity->getType(),
+		array('entity' => $entity), false)) {
+		return $likeno;
+	} else {
+		return count_annotations($entity->getGUID(), "", "", "likes");
+	}
+}
 
 /**
  * Automatically views comments and a comment form relating to the given entity
@@ -2901,6 +2932,8 @@ function elgg_boot() {
 	// Actions
 	register_action('comments/add');
 	register_action('comments/delete');
+	register_action('likes/add');
+	register_action('likes/delete');
 
 	elgg_view_register_simplecache('css');
 	elgg_view_register_simplecache('js/friendsPickerv1');
diff --git a/languages/en.php b/languages/en.php
index f51940e6e..0fc4e3ba6 100644
--- a/languages/en.php
+++ b/languages/en.php
@@ -823,6 +823,21 @@ If you requested this click on the link below, otherwise ignore this email.
  * XML-RPC
  */
 	'xmlrpc:noinputdata'	=>	"Input data missing",
+	
+/**
+ * Likes
+ **/
+ 	'likes:this' => 'liked this',
+ 	'likes:deleted' => 'Your like has been removed',
+ 	'likes:notdeleted' => 'There was a problem removing your like',
+ 	'likes:likes' => 'You now like this item',
+ 	'likes:failure' => 'There was a problem liking this item',
+ 	'likes:alreadyliked' => 'You have already liked this item',
+ 	'likes:notfound' => 'The item you are trying to like cannot be found',
+ 	'likes:likethis' => 'Like this',
+ 	'likes:userlikedthis' => 'user liked this',
+ 	'likes:userslikethis' => 'users liked this',
+ 	'likes:river:annotate' => 'likes',
 
 /**
  * Comments
diff --git a/views/default/annotation/annotatelike.php b/views/default/annotation/annotatelike.php
new file mode 100644
index 000000000..7c7b1887a
--- /dev/null
+++ b/views/default/annotation/annotatelike.php
@@ -0,0 +1,11 @@
+<?php
+
+$performed_by = get_entity($vars['item']->subject_guid);
+$object = get_entity($vars['item']->object_guid);
+$url = $object->getURL();
+$title = $object->title;
+ 
+$string = "<a href=\"{$performed_by->getURL()}\">{$performed_by->name}</a> ";
+$string .= elgg_echo("likes:river:annotate") . "  <a href=\"{$object->getURL()}\">" . $title . "</a> " . friendly_time($object->time_created);
+	
+echo $string;
\ No newline at end of file
diff --git a/views/default/annotation/likes.php b/views/default/annotation/likes.php
new file mode 100644
index 000000000..d095c82eb
--- /dev/null
+++ b/views/default/annotation/likes.php
@@ -0,0 +1,39 @@
+<?php
+/**
+ * Elgg show the user who liked the object
+ */
+
+$owner = get_user($vars['annotation']->owner_guid);
+
+?>
+<div class="elgg_likes clearfloat">
+	<div class="elgg_likes_icon">
+		<?php
+			echo elgg_view("profile/icon", array(
+					'entity' => $owner,
+					'size' => 'tiny'
+					));
+		?>
+	</div>
+	
+	<div class="elgg_likes_details">
+		<?php
+		// if the user looking at the like listing can edit, show the delete link
+		if ($vars['annotation']->canEdit()) {
+		?>
+			<span class="delete_button">
+				<?php echo elgg_view("output/confirmlink",array(
+						'href' => $vars['url'] . "action/likes/delete?annotation_id=" . $vars['annotation']->id,
+						'text' => elgg_echo('remove'),
+						'confirm' => elgg_echo('deleteconfirm')
+						));
+				?>
+			</span>
+		<?php
+			} //end of can edit if statement
+		?>
+		<p class="elgg_likes_owner">
+			<a href="<?php echo $owner->getURL(); ?>"><?php echo $owner->name; ?></a> <?php echo elgg_echo('likes:this'); ?>
+		</p>
+	</div>
+</div>
\ No newline at end of file
diff --git a/views/default/likes/forms/edit.php b/views/default/likes/forms/edit.php
new file mode 100644
index 000000000..4a9bbb7d7
--- /dev/null
+++ b/views/default/likes/forms/edit.php
@@ -0,0 +1,30 @@
+<?php
+/**
+ * Elgg likes add form
+ *
+ * @package Elgg
+ * @author Curverider Ltd <info@elgg.com>
+ * @link http://elgg.com/
+ *
+ * @uses $vars['entity']
+ */
+	 
+if (isset($vars['entity']) && isloggedin()) { 
+	$guid = $vars['entity']->getGuid();
+	$url = elgg_add_action_tokens_to_url($vars['url'] . "action/likes/add?guid={$guid}");
+	//check to see if the user has already liked
+	if(!elgg_already_created_annotation($guid, 'likes'))
+		echo "<a href=\"{$url}\">" . elgg_echo('likes:likethis') . "</a>";	 	
+	//display the number of likes
+	$numoflikes = elgg_count_likes($vars['entity']);
+	if($numoflikes != 0){
+		if($numoflikes == 1)
+			echo "<br /><a onclick=\" $('#showLikes').show('slow');\">" . elgg_count_likes($vars['entity']) . " " . elgg_echo('likes:userlikedthis') . "</a>";
+		else
+			echo "<br /><a onclick=\" $('#showLikes').show('slow');\">" . elgg_count_likes($vars['entity']) . " " . elgg_echo('likes:userslikethis') . "</a>";
+	}
+	//show the users who liked the object
+	echo "<div id=\"showLikes\" style=\"display:none;\">";
+	echo list_annotations($vars['entity']->getGUID(),'likes');
+	echo "</div>";
+}
\ No newline at end of file
-- 
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