move tweet button to a plugin, implement basic support for article action button plugins

classes/feeds.php

@@ -704,11 +704,15 @@ class Feeds extends Protected_Handler {
 						onclick=\"emailArticle($id)\"
 						alt='Zoom' title='".__('Forward by email')."'>";
 
-					if (ENABLE_TWEET_BUTTON) {
-						$reply['content'] .= "<img src=\"".theme_image($this->link, 'images/art-tweet.png')."\"
-							class='tagsPic' style=\"cursor : pointer\"
-							onclick=\"tweetArticle($id)\"
-							alt='Zoom' title='".__('Share on Twitter')."'>";
+					$button_plugins = explode(",", ARTICLE_BUTTON_PLUGINS);
+
+					foreach ($button_plugins as $p) {
+						$pclass = "${p}_button";
+
+						if (class_exists($pclass)) {
+							$plugin = new $pclass($link);
+							$rv['content'] .= $plugin->render($id);
+						}
 					}
 
 					$reply['content'] .= "<img src=\"".theme_image($this->link, 'images/art-share.png')."\"

classes/rpc.php

@@ -753,21 +753,16 @@ class RPC extends Protected_Handler {
 		return;
 	}
 
-	function getTweetInfo() {
-		$id = db_escape_string($_REQUEST['id']);
-
-		$result = db_query($this->link, "SELECT title, link
-				FROM ttrss_entries, ttrss_user_entries
-				WHERE id = '$id' AND ref_id = id AND owner_uid = " .$_SESSION['uid']);
-
-		if (db_num_rows($result) != 0) {
-			$title = truncate_string(strip_tags(db_fetch_result($result, 0, 'title')),
-				100, '...');
-			$article_link = db_fetch_result($result, 0, 'link');
+	function buttonPlugin() {
+		$pclass = basename($_REQUEST['plugin']) . "_button";
+		$method = $_REQUEST['plugin_method'];
+
+		if (class_exists($pclass)) {
+			$plugin = new $pclass($this->link);
+			if (method_exists($plugin, $method)) {
+				return $plugin->$method();
+			}
 		}
-
-		print json_encode(array("title" => $title, "link" => $article_link,
-				"id" => $id));
 	}
 
 	function setNote() {

config.php-dist

@@ -175,9 +175,6 @@
 	// *** Twitter integration settings ***
 	// ************************************
 	
-	define('ENABLE_TWEET_BUTTON', false);
-	// Enable 'tweet this' button for articles
-
 	define('CONSUMER_KEY', '');
 	define('CONSUMER_SECRET', '');
 	// Your OAuth instance authentication information for Twitter, visit
@@ -203,6 +200,11 @@
 	// Displays an URL for users to provide feedback or comments regarding
 	// this instance of tt-rss. Can lead to a forum, contact email, etc.
 
+	define('ARTICLE_BUTTON_PLUGINS', 'tweet');
+	// Comma-separated list of additional article action button plugins
+	// to enable, like tweet button, etc.
+	// The following plugins are available: tweet
+
 	define('CONFIG_VERSION', 24);
 	// Expected config version. Please update this option in config.php
 	// if necessary (after migrating all new options from this file).

include/functions.php

@@ -3289,11 +3289,15 @@
 					onclick=\"emailArticle($id)\"
 					alt='Zoom' title='".__('Forward by email')."'>";
 
-				if (ENABLE_TWEET_BUTTON) {
-					$rv['content'] .= "<img src=\"".theme_image($link, 'images/art-tweet.png')."\"
-							class='tagsPic' style=\"cursor : pointer\"
-							onclick=\"tweetArticle($id)\"
-							alt='Zoom' title='".__('Share on Twitter')."'>";
+				$button_plugins = explode(",", ARTICLE_BUTTON_PLUGINS);
+
+				foreach ($button_plugins as $p) {
+					$pclass = "${p}_button";
+
+					if (class_exists($pclass)) {
+						$plugin = new $pclass($link);
+						$rv['content'] .= $plugin->render($id);
+					}
 				}
 
 				$rv['content'] .= "<img src=\"".theme_image($link, 'images/art-share.png')."\"

index.php

@@ -40,6 +40,16 @@
 	<?php print_theme_includes($link) ?>
 	<?php print_user_stylesheet($link) ?>
 
+	<script type="text/javascript">
+	<?php foreach (explode(",", ARTICLE_BUTTON_PLUGINS) as $p) {
+		$jsf = "js/${p}_button.js";
+		if (file_exists($jsf)) {
+			include $jsf;
+			print "</script>";
+		}
+	} ?>
+	</script>
+
 	<link rel="shortcut icon" type="image/png" href="images/favicon.png"/>
 
 	<script type="text/javascript" src="lib/prototype.js"></script>

js/viewfeed.js

@@ -1994,37 +1994,6 @@ function initHeadlinesMenu() {
 	}
 }
 
-function tweetArticle(id) {
-	try {
-		var query = "?op=rpc&method=getTweetInfo&id=" + param_escape(id);
-
-		console.log(query);
-
-		var d = new Date();
-      var ts = d.getTime();
-
-		var w = window.open('backend.php?op=backend&method=loading', 'ttrss_tweet',
-			"status=0,toolbar=0,location=0,width=500,height=400,scrollbars=1,menubar=0");
-
-		new Ajax.Request("backend.php",	{
-			parameters: query,
-			onComplete: function(transport) {
-				var ti = JSON.parse(transport.responseText);
-
-				var share_url = "http://twitter.com/share?_=" + ts +
-					"&text=" + param_escape(ti.title) +
-					"&url=" + param_escape(ti.link);
-
-				w.location.href = share_url;
-
-			} });
-
-
-	} catch (e) {
-		exception_error("tweetArticle", e);
-	}
-}
-
 function editArticleNote(id) {
 	try {