add like

addons/plugins/Likes/.gitignore

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+.buildpath
+.project
+.settings
+.htaccess
+
+# Compiled source
+*.com
+*.class
+*.dll
+*.exe
+*.o
+*.so
+
+# Packages
+*.7z
+*.dmg
+*.gz
+*.iso
+*.jar
+*.rar
+*.tar
+*.zip
+
+# Logs and databases
+*.log
+*.sql
+*.sqlite
+
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+*~

addons/plugins/Likes/README.md

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+# Likes Plugin
+
+Allows members to like posts.
+
+## Installation
+
+[Download](https://github.com/esotalk/Likes/archive/master.zip) or clone the Likes plugin repo into your esoTalk plugin directory:
+
+	cd ESOTALK_DIR/addons/plugins/
+	git clone git@github.com:esotalk/Likes.git Likes
+
+Navigate to the the admin/plugins page and activate the Likes plugin.
+
+## Translation
+
+Create `definitions.Likes.php` in your language pack with the following definitions:
+
+	$definitions["Unlike"] = "Unlike";
+	$definitions["Like"] = "Like";
+	$definitions["Members Who Liked This Post"] = "Members Who Liked This Post";
+	$definitions["%s likes this."] = "%s likes this.";
+	$definitions["%s like this."] = "%s like this.";

addons/plugins/Likes/plugin.php

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+<?php
+// Copyright 2011 Toby Zerner, Simon Zerner
+// This file is part of esoTalk. Please see the included license file for usage information.
+
+if (!defined("IN_ESOTALK")) exit;
+
+ET::$pluginInfo["Likes"] = array(
+	"name" => "Likes",
+	"description" => "Allows members to like posts.",
+	"version" => ESOTALK_VERSION,
+	"author" => "Toby Zerner",
+	"authorEmail" => "support@esotalk.org",
+	"authorURL" => "http://esotalk.org",
+	"license" => "GPLv2",
+	"dependencies" => array(
+		"esoTalk" => "1.0.0g4"
+	)
+);
+
+class ETPlugin_Likes extends ETPlugin {
+
+// Like a post.
+public function action_conversationController_like($sender, $postId = false)
+{
+	$sender->responseType = RESPONSE_TYPE_JSON;
+	if (!$sender->validateToken() or !ET::$session->userId or ET::$session->isSuspended()) return;
+
+	// Get the conversation.
+	if (!($conversation = ET::conversationModel()->getByPostId($postId))) return false;
+
+	// Get the post.
+	$post = ET::postModel()->getById($postId);
+
+	ET::SQL()->insert("like")
+		->set("postId", $post["postId"])
+		->set("memberId", ET::$session->userId)
+		->setOnDuplicateKey("memberId", ET::$session->userId)
+		->exec();
+
+	$post["likes"][ET::$session->userId] = array("avatarFormat" => ET::$session->user["avatarFormat"], "username" => ET::$session->user["username"]);
+
+	$sender->json("names", $this->getNames($post["likes"]));
+	$sender->render();
+}
+
+// Unlike a post.
+public function action_conversationController_unlike($sender, $postId = false)
+{
+	$sender->responseType = RESPONSE_TYPE_JSON;
+	if (!$sender->validateToken() or !ET::$session->userId) return;
+
+	// Get the conversation.
+	if (!($conversation = ET::conversationModel()->getByPostId($postId))) return false;
+
+	// Get the post.
+	$post = ET::postModel()->getById($postId);
+
+	ET::SQL()->delete()
+		->from("like")
+		->where("postId=:postId")->bind(":postId", $post["postId"])
+		->where("memberId=:memberId")->bind(":memberId", ET::$session->userId)
+		->exec();
+
+	unset($post["likes"][ET::$session->userId]);
+
+	$sender->json("names", $this->getNames($post["likes"]));
+	$sender->render();
+}
+
+// Show a list of members who liked a post.
+public function action_conversationController_liked($sender, $postId = false)
+{
+	if (!($postId = (int)$postId)) return;
+	$post = ET::postModel()->getById($postId);
+	if (!$post) return;
+
+	$sender->data("members", $post["likes"]);
+
+	$sender->render($this->view("liked"));
+}
+
+// Get the likes from the database and attach them to the posts.
+public function handler_postModel_getPostsAfter($sender, &$posts)
+{
+	$postsById = array();
+	foreach ($posts as &$post) {
+		$postsById[$post["postId"]] = &$post;
+		$post["likes"] = array();
+	}
+
+	if (!count($postsById)) return;
+
+	$result = ET::SQL()
+		->select("postId, m.memberId, m.email, username, avatarFormat")
+		->from("like l")
+		->from("member m", "m.memberId=l.memberId", "left")
+		->where("postId IN (:ids)")
+		->bind(":ids", array_keys($postsById))
+		->exec();
+
+	while ($row = $result->nextRow()) {
+		$postsById[$row["postId"]]["likes"][$row["memberId"]] = array("memberId" => $row["memberId"], "username" => $row["username"], "email" => $row["email"], "avatarFormat" => $row["avatarFormat"]);
+	}
+}
+
+public function handler_conversationController_renderBefore($sender)
+{
+	$sender->addJSLanguage("Like", "Unlike");
+	$sender->addJSFile($this->resource("likes.js"));
+	$sender->addCSSFile($this->resource("likes.css"));
+}
+
+public function handler_conversationController_formatPostForTemplate($sender, &$formatted, $post, $conversation)
+{
+	if ($post["deleteMemberId"]) return;
+
+	$liked = array_key_exists(ET::$session->userId, $post["likes"]);
+
+	$members = $this->getNames($post["likes"]);
+	if ( ! ET::$session->userId and ! $members) return;
+
+	$likeText = isset(ET::$session->userId) ? T($liked ? "Unlike" : "Like") : "";
+
+	$likes = "<p class='likes".($liked ? " liked" : "")."'>
+		<a href='#' class='like-button'>$likeText</a>
+		<span class='like-separator'".( (! ET::$session->userId or ! $members) ? " style='display:none'" : "").">&nbsp;&middot;&nbsp;</span>
+		<span class='like-members'>$members</span>
+	</p>";
+
+	$formatted["footer"][] = $likes;
+}
+
+public function getNames($likes)
+{
+	$names = array();
+	foreach ($likes as $id => $member) $names[] = memberLink($id, $member["username"]);
+
+	// If there's more than one name, construct the list so that it has the word "and" in it.
+	if (count($names) > 1) {
+
+		// If there're more than 3 names, chop off everything after the first 3 and replace them with a
+		// "x others" link.
+		if (count($names) > 3) {
+			$otherNames = array_splice($names, 3);
+			$lastName = "<a href='#' class='showMore name'>".sprintf(T("%s others"), count($otherNames))."</a>";
+		} else {
+			$lastName = array_pop($names);
+		}
+
+		$members = sprintf(T("%s like this."), sprintf(T("%s and %s"), implode(", ", $names), $lastName));
+	}
+
+	// If there's only one name, we don't need to do anything gramatically fancy.
+	elseif (count($names)) {
+		$members = sprintf(T("%s likes this."), $names[0]);
+	}
+	else {
+		$members = "";
+	}
+
+	return $members;
+}
+
+public function setup($oldVersion = "")
+{
+	$structure = ET::$database->structure();
+	$structure->table("like")
+		->column("postId", "int unsigned", false)
+		->column("memberId", "int unsigned", false)
+		->key(array("postId", "memberId"), "primary")
+		->exec(false);
+
+	return true;
+}
+
+}

addons/plugins/Likes/resources/likes.css

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+.likes {
+	border-top:1px solid #eee;
+	font-size:11px;
+	padding:5px 12px;
+	margin:1px 0 0;
+}

addons/plugins/Likes/resources/likes.js

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+$(function() {
+
+	$(document).on("click", ".likes .showMore", function(e) {
+		e.preventDefault();
+		ETSheet.loadSheet("onlineSheet", "conversation/liked.view/"+$(this).parents(".post").data("id"));
+	});
+
+	$(document).on("click", ".likes .like-button", function(e) {
+		e.preventDefault();
+		var area = $(this).parents(".likes");
+		area.find(".like-button").html(area.hasClass("liked") ? T("Like") : T("Unlike"));
+
+		$.ETAjax({
+			url: "conversation/"+(area.hasClass("liked") ? "unlike" : "like")+".json/"+area.parents(".post").data("id"),
+			success: function(data) {
+				area.find(".like-members").html(data.names);
+				area.find(".like-separator").toggle(!!data.names);
+				area.toggleClass("liked");
+			}
+		});
+	});
+
+});

addons/plugins/Likes/views/liked.php

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+<?php
+// Copyright 2011 Toby Zerner, Simon Zerner
+// This file is part of esoTalk. Please see the included license file for usage information.
+
+if (!defined("IN_ESOTALK")) exit;
+
+?>
+<div class='sheet' id='onlineSheet'>
+<div class='sheetContent'>
+
+<h3><?php echo T("Members Who Liked This Post"); ?><?php if (count($data["members"])) echo " (".count($data["members"]).")"; ?></h3>
+
+<?php
+// If there are members online, list them.
+if (count($data["members"])): ?>
+
+<div class='section' id='onlineList'>
+
+<ul class='list'>
+<?php foreach ($data["members"] as $memberId => $member): ?>
+<li>
+<span class='action'>
+<?php echo avatar($member, "thumb"), " ", memberLink($memberId, $member["username"]), " "; ?>
+</span>
+</li>
+<?php endforeach; ?>
+</ul>
+
+</div>
+
+<?php
+// Otherwise, display a 'no members online' message.
+else: ?>
+
+<div class='section'>
+<div class='noResults help'>
+</div>
+</div>
+
+<?php endif; ?>
+
+</div>
+</div>