/wp-content/plugins/retweet-anywhere/retweet-anywhere.php

<?php

/*

Plugin Name: Retweet Anywhere

Plugin URI: http://kovshenin.com/wordpress/plugins/retweet-anywhere/

Description: Retweet Anywhere for WordPress is a nice and easy way to allow your readers to instantly retweet your blog posts through their Twitter accounts

Author: Konstantin Kovshenin

Version: 0.1.2

Author URI: http://kovshenin.com/



	License



    Retweet Anywhere

    Copyright (C) 2010 Konstantin Kovshenin (kovshenin@live.com)



    This program is free software: you can redistribute it and/or modify

    it under the terms of the GNU General Public License as published by

    the Free Software Foundation, either version 3 of the License, or

    (at your option) any later version.



    This program is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    GNU General Public License for more details.



    You should have received a copy of the GNU General Public License

    along with this program.  If not, see <http://www.gnu.org/licenses/>.

    

*/



// JSON services for PHP4

if(!function_exists('json_encode'))

{

	include_once('json.php');

	$GLOBALS['JSON_OBJECT'] = new Services_JSON();

	function json_encode($value)

	{

		return $GLOBALS['JSON_OBJECT']->encode($value); 

	}

	

	function json_decode($value)

	{

		return $GLOBALS['JSON_OBJECT']->decode($value); 

	}

}



class RetweetAnywhereWidget extends WP_Widget {

	function RetweetAnywhereWidget()

	{

		$widget_ops = array('classname' => 'widget-retweet-anywhere', 'description' => __("A retweet widget for your blog"));

		$this->WP_Widget('widget-retweet-anywhere', __('Retweet Anywhere'), $widget_ops);

	}

	

	function widget($args, $instance)

	{

		extract($args);

		$title = apply_filters('widget_title', $instance['title']);

		$format = $instance['format'];

		$width = $instance['width'];

		$height = $instance['height'];

		

		global $wp_query;

		if ($wp_query->in_the_loop || is_singular())

		{

			global $post;

			$post_id = $post->ID;

		}

		else

			$post_id = 0;

		

		echo $before_widget;



		echo "<div class='retweet-anywhere-widget-box'>

			<style>.retweet-anywhere-widget-box em {display: none;}</style>

			<em class='post_id'>{$post_id}</em>

			<em class='title'>{$title}</em>

			<em class='format'>{$format}</em>

			<em class='width'>{$width}</em>

			<em class='height'>{$height}</em>

		</div>";

		

		echo $after_widget;

	}

	

	function update($new_instance, $old_instance)

	{

		return $new_instance;

	}

	

	function form($instance)

	{

		$instance = wp_parse_args((array) $instance, array('title' => 'Retweet', 'format' => '%s %l', 'width' => '200', 'height' => '70'));

		$title = $instance['title'];

		$format = $instance['format'];

		$width = $instance['width'];

		$height = $instance['height'];

?>

<p><label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('Title:'); ?> <input class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" type="text" value="<?php echo esc_attr($title); ?>" /></label></p>

<p><label for="<?php echo $this->get_field_id('format'); ?>"><?php _e('Format:'); ?> <input class="widefat" id="<?php echo $this->get_field_id('format'); ?>" name="<?php echo $this->get_field_name('format'); ?>" type="text" value="<?php echo esc_attr($format); ?>" /></label><br /><span class="description">Described in the <a href="http://kovshenin.com/wordpress/plugins/retweet-anywhere/#faq">FAQ</a></span></p>

<p><label for="<?php echo $this->get_field_id('width'); ?>"><?php _e('Width (in px):'); ?> <input class="widefat" id="<?php echo $this->get_field_id('width'); ?>" name="<?php echo $this->get_field_name('width'); ?>" type="text" value="<?php echo esc_attr($width); ?>" /></label></p>

<p><label for="<?php echo $this->get_field_id('height'); ?>"><?php _e('Height (in px):'); ?> <input class="widefat" id="<?php echo $this->get_field_id('height'); ?>" name="<?php echo $this->get_field_name('height'); ?>" type="text" value="<?php echo esc_attr($height); ?>" /></label></p>

<?php

	}

}



// Main Retweet Anywhere class

class RetweetAnywhere {



	// Settings

	var $settings = array();

	var $default_settings = array();

	var $shorteners = array();

	

	// Admin notices

	var $notices = array();



	function RetweetAnywhere()

	{

		// Default plugin settings

		$this->default_settings = array(

			"title" => "Retweet This Post",

			"format" => "%s %l",

			"shortener" => "none",

			"placement" => "end",

			"style" => "default",

			"opacity" => "0.5",

			"widget" => "no",

		);

		

		// Load the plugin settings and merge with defaults

		$this->settings = (array) get_option("retweet-anywhere");

		$this->settings = array_merge($this->default_settings, $this->settings);

		

		// Action hooks

		add_action("wp_enqueue_scripts", array(&$this, "wp_enqueue_scripts"));

		

		// AJAX hooks to get message

		add_action("wp_ajax_rta_getmessage", array(&$this, "ajax_getmessage"));

		add_action("wp_ajax_nopriv_rta_getmessage", array(&$this, "ajax_getmessage"));

		

		// Admin system customization (menus, notices, etc)

		add_action("admin_menu", array(&$this, "admin_menu"));

		add_action("admin_init", array(&$this, "admin_init"));

		add_action("admin_notices", array(&$this, "admin_notices"));

		

		// Shortcode and content filters

		if ($this->settings["placement"] != "manual")

			add_filter("the_content", array(&$this, "the_content"));

		add_shortcode("retweet-anywhere", array(&$this, "shortcode"));

		

		// Enable the shortcode for widget text if set in the settings

		if ($this->settings["widget"] == "yes")

		{

			add_filter("widget_text", "do_shortcode");

		}

		

		// Administration notices

		if (empty($this->settings["api_key"]))

			$this->notices[] = "Please configure your Twitter API key in order to use Retweet Anywhere: <a href='options-general.php?page=retweet-anywhere/retweet-anywhere.php'>Plugin Settings</a>";

		if ($this->settings["shortener"] == "bitly" && (empty($this->settings["bitly_username"]) || empty($this->settings["bitly_api_key"])))

			$this->notices[] = "Bit.ly requires a username and a valid API key in order to work. <a href='options-general.php?page=retweet-anywhere/retweet-anywhere.php'>Plugin Settings</a>";

	}

	

	// Widget registration

	function widgets_init()

	{

		register_widget("RetweetAnywhereWidget");

	}

	

	// Settings management

	function admin_init()

	{

		register_setting('retweet-anywhere', 'retweet-anywhere');

	}

	

	// Plugin settings page

	function admin_menu()

	{

		$page = add_submenu_page('options-general.php', 'Retweet Anywhere Settings', 'Retweet Anywhere', 'administrator', __FILE__, array(&$this, "settings_page"));

		add_action("admin_print_scripts-{$page}", array(&$this, "admin_print_scripts"));

	}

	

	// Admin panel scripts

	function admin_print_scripts()

	{

		wp_enqueue_script("retweet-anywhere-admin", plugins_url("/js/admin.js", __FILE__), array("jquery"));

	}

	

	// Settings page content

	function settings_page()

	{

?>

<div class="wrap">

<h2>Retweet Anywhere Settings</h2>



<form method="post" action="options.php">

<?php

	// Nonce fields and settings

	wp_nonce_field('update-options');

	settings_fields('retweet-anywhere');

?>



	<h3>General</h3>

	<p class="description">These are the general settings used by the Retweet Anywhere plugin. Make sure you get the Twitter API key correct.</p>

	<table class="form-table">

		<tr valign="top">

			<th scope="row">Twitter API Key</th>

			<td><input type="text" class="regular-text" name="retweet-anywhere[api_key]" value="<?php echo $this->settings["api_key"]; ?>" /> <span class="description">The Twitter API key (<a href="http://kovshenin.com/wordpress/plugins/retweet-anywhere/#faq">How do I get one?</a>)</span></td>

		</tr>

		<tr valign="top">

			<th scope="row">Popup Title</th>

			<td><input type="text" class="regular-text" name="retweet-anywhere[title]" value="<?php echo $this->settings["title"]; ?>" /> <span class="description">Title goes above your tweet box, eg <code>Retweet This Post</code>.</span></td>

		</tr>

		<tr valign="top">

			<th scope="row">Retweet Format</th>

			<td><input type="text" class="regular-text" name="retweet-anywhere[format]" value="<?php echo $this->settings["format"]; ?>" /> <span class="description">The message format, eg: <code>%s %l (via @kovshenin)</code> described in the <a href="http://kovshenin.com/wordpress/plugins/retweet-anywhere/#faq">FAQ</a>.</span></td>

		</tr>

		<tr valign="top">

			<th scope="row">Enable Widget Shortcode</th>

			<?php $checked = ($this->settings["widget"] == "yes") ? 'checked="checked"' : ''; ?>

			<td><input type="checkbox" name="retweet-anywhere[widget]" <?php echo $checked; ?> value="yes" /> <span class="description">If you're planning to use the shortcode in your text widgets, enable this.</span></td>

			<?php unset($checked); ?>

		</tr>



	</table>

	

	<br /><h3>URL Shortening</h3>

	<p class="description">Pick your favorite shortening service and provide us with your account details.</p>

	<table class="form-table">

		<tr valign="top">

			<th scope="row">URL Shortener</th>

			<td>

				<?php

					$selected[$this->settings["shortener"]] = 'selected="selected"';

				?>

					<select name="retweet-anywhere[shortener]" id="rta-shortener">

						<option value="none" <?php echo @$selected["none"]; ?>>Don't shorten</option>

						<option value="bitly" <?php echo @$selected["bitly"]; ?>>Bit.ly</option>

						<?php							

						// Additional shorteners							

						$this->shorteners = apply_filters('retweet-anywhere-shorteners', $this->shorteners);

						if ($this->shorteners)

							foreach ($this->shorteners as $key => $shortener)

								echo '<option value="' . $key . '" ' . @$selected[$key] . '>' . $shortener['name'] . '</option>';

						?>

					</select>

				<?php

					unset($selected);

				?>

				<span class="description">Pick your favorite URL shortener</span>

			</td>

		</tr>

		<tr valign="top">

			<th scope="row">Bit.ly Username</th>

			<td><input type="text" class="regular-text rta-bitly" name="retweet-anywhere[bitly_username]" value="<?php echo $this->settings["bitly_username"]; ?>" /> <span class="description">A valid bit.ly account username (<a href="http://bit.ly/account/register">Register for a bit.ly account</a>)</span></td>

		</tr>

		<tr valign="top">

			<th scope="row">Bit.ly API Key</th>

			<td><input type="text" class="regular-text rta-bitly" name="retweet-anywhere[bitly_api_key]" value="<?php echo $this->settings["bitly_api_key"]; ?>" /> <span class="description">Your bit.ly API key (<a href="http://bit.ly/account/your_api_key/">Where do I find it?</a>)</span></td>

		</tr>

	</table>



	<br /><h3>Look &amp; Feel</h3>

	<p class="description">Customize the look and feel of your retweet button.</p>

	<table class="form-table">

		<tr valign="top">

			<th scope="row">Placement</th>

			<td>

			<?php

				$selected[$this->settings["placement"]] = 'selected="selected"';

			?>

				<select name="retweet-anywhere[placement]">

					<option value="beginning" <?php echo @$selected["beginning"]; ?>>Beginning of post</option>

					<option value="end" <?php echo @$selected["end"]; ?>>End of post</option>

					<option value="manual" <?php echo @$selected["manual"]; ?>>Manual (PHP or Shortcode)</option>

				</select>

			<?php

				unset($selected);

			?>

				<span class="description">Select where you'd like your retweet button to appear. Details described in the <a href="http://kovshenin.com/wordpress/plugins/retweet-anywhere/#faq">FAQ</a>.</span>

			</td>

		</tr>

		<tr valign="top">

			<th scope="row">Button Style</th>

			<td>

			<?php

				$selected[$this->settings["style"]] = 'selected="selected"';

			?>

				<select name="retweet-anywhere[style]" id="rta-style">

					<option value="default" <?php echo @$selected["default"]; ?>>Default</option>

					<option value="text" <?php echo @$selected["text"]; ?>>Default Text</option>

					<option value="html" <?php echo @$selected["html"]; ?>>Custom HTML</option>

				</select>

			<?php

				unset($selected);

			?>

				<span class="description">This is a tricky one, default is a blue button, default text is simply a <code>Retweet</code> link. Use custom HTML to write your own.</span>

			</td>

		</tr>

		<tr valign="top">

			<th scope="row">Custom HTML</th>

			<td><input type="text" class="regular-text rta-style-html" name="retweet-anywhere[style_html]" value="<?php echo htmlspecialchars($this->settings["style_html"]); ?>" /> <span class="description">Do not include the <code>&lt;a&gt; &lt;/a&gt;</code> tags, they're done for you. Write only what's inside.</span></td>

		</tr>

		<tr valign="top">

			<th scope="row">Background Opacity</th>

			<td>

			<?php

				$selected[$this->settings["opacity"]] = 'selected="selected"';

			?>

				<select name="retweet-anywhere[opacity]">

					<option value="0.9" <?php echo @$selected["0.9"]; ?>>90% Black</option>

					<option value="0.5" <?php echo @$selected["0.5"]; ?>>50% Black</option>

					<option value="0.2" <?php echo @$selected["0.2"]; ?>>20% Black</option>

					<option value="0" <?php echo @$selected["0"]; ?>>0% Black (No Fill)</option>

				</select>

			<?php

				unset($selected);

			?>

				<span class="description">It's sometimes a good idea to fade the background so that retweeters could concentrate on the "Tweet" button ;)</span>

			</td>

		</tr>

	</table>

	<input type="hidden" name="action" value="update" />

	<input type="hidden" name="page_options" value="retweet-anywhere[]" />

	<p class="submit">

		<input type="submit" class="button-primary" value="<?php _e('Save Changes') ?>" />

	</p>

</form>

</div>

<?php

	}



	// the_content filter

	function the_content($content)

	{

		// Let's see where we'd like to place the retweet button

		switch ($this->settings["placement"])

		{

			case "beginning":

				$content = "[retweet-anywhere]\r\n" . $content;

				break;

			case "end":

				$content = $content . "\r\n[retweet-anywhere]";

				break;

		}



		return $content;

	}



	// Shortcode

	function shortcode($atts)

	{

		// Extract the attributes

		extract(shortcode_atts(array(

			"html" => false,

			"format" => false,

			"title" => false,

		), $atts));



		if (!$html) $html = $this->get_button();

		if (!$format) $format = "";

		if (!$title) $title = $this->settings["title"];

		$message = '';

		

		// Let's see if we're inside the loop

		global $wp_query;

		if ($wp_query->in_the_loop || is_singular())

		{

			global $post;

			return '<a href="http://twitter.com/?status=' . urlencode($post->post_title . " " . $post->guid) . '" class="retweet-anywhere" title="' . $title . '" rev="' . $format . '" rel="' . $post->ID . '">' . $html . '</a>';

		}

		else

		{

			// Not inside the loop, link to the current page

			return '<a href="http://twitter.com/?status=' . urlencode(get_bloginfo("title") . " " . get_bloginfo("home")) . '" class="retweet-anywhere" title="' . $title . '" rev="' . $format . '" rel="0">' . $html . '</a>';

		}

	}

	

	// Echo the button according to the style

	function get_button()

	{

		switch ($this->settings["style"])

		{

			case "default":

				return '<img src="' . plugins_url("/images/retweet.png", __FILE__) . '" alt="Retweet" />';

				break;

			case "text":

				return 'Retweet';

				break;

			case "html":

				return $this->settings["style_html"];

				break;

		}

	}



	function wp_enqueue_scripts()

	{

		wp_enqueue_style("facebox", plugins_url("/css/facebox.css", __FILE__));

	

		$api_key = $this->settings["api_key"];

		wp_enqueue_script("twitter-anywhere", "http://platform.twitter.com/anywhere.js?id={$api_key}&v=1");

		wp_enqueue_script("facebox", plugins_url("/js/facebox.js", __FILE__), array("jquery"));

		wp_enqueue_script("retweet-anywhere", plugins_url("/js/retweet-anywhere.js", __FILE__), array("jquery", "facebox"));

		wp_localize_script("retweet-anywhere", "RetweetAnywhere", array(

			"ajaxurl" => admin_url('admin-ajax.php'),

			"loadingImage" => plugins_url("/images/facebox/loading.gif", __FILE__),

			"closeImage" => plugins_url("/images/facebox/closelabel.gif", __FILE__),

			"opacity" => $this->settings["opacity"],

			"title" => $this->settings["title"]

		));

	}



	// The AJAX call to retrieve the message

	function ajax_getmessage()

	{

		// Get all the details

		$post_id = $_POST["post_id"];

		$format = $_POST["format"];



		if (empty($format))

			$format = $this->settings["format"];

			

		// If we don't need %s or %l data then we don't query for the post

		if (strpos($format, "%s") === false && strpos($format, "%l") === false)

		{

			$message = $format;

		}

		else

		{

			if ($post_id == 0)

			{

				// If the post_id is 0 then link to the homepage

				$title = get_bloginfo("title");

				$url = get_bloginfo("home");

			}

			else

			{

				// Get the post data

				$post = get_post($post_id);

				$title = $post->post_title;

				$url = get_permalink($post_id);

			}

			

			// Shorten the link if we need to

			if ($this->settings["shortener"] == "bitly")

				$url = $this->shorten($url, $post_id);

			elseif ($this->settings['shortener'] != 'none')

			{

				$this->shorteners = apply_filters('retweet-anywhere-shorteners', $this->shorteners);

				if (function_exists($this->shorteners[$this->settings['shortener']]['callback']))

				{

					$f = $this->shorteners[$this->settings['shortener']]['callback'];

					$url = $f($url);

				}

			}

			// Format the message

			$replace = array(

				"%s" => $title,

				"%l" => $url

			);



			$message = str_replace(array_keys($replace), array_values($replace), $format);

		}

		

		// Format the response array

		$response = array(

			"message" => $message

		);

		

		// JSON encode, print and die

		echo json_encode($response);

		die();

	}

	

	// Shorten the URL via bit.ly

	function shorten($url, $post_id = 0)

	{

		if ($post_id > 0)

		{

			$short = get_post_meta($post_id, 'rta-shorturl', true);

			if (!empty($short))

				return $short;

		}



		// Let's get the WP_Http class if we don't have one

		if(!class_exists('WP_Http'))

			include_once(ABSPATH . WPINC . '/class-http.php');

		

		// Encode the url

		$url_encoded = urlencode($url);

		

		// Get the bit.ly settings

		$bitly_login = urlencode(trim($this->settings["bitly_username"]));

		$bitly_key = urlencode(trim($this->settings["bitly_api_key"]));

		

		// Init $http and fire the request

		$http = new WP_Http();		

		$result = $http->request("http://api.bit.ly/v3/shorten?login={$bitly_login}&apiKey={$bitly_key}&uri={$url_encoded}&format=json");

		

		if (gettype($result) == "object")

			if (get_class($result) == "WP_Error")

				return $url;

				

		// JSON decode the result body and return the data->url

		$result = json_decode($result["body"]);

		$result = $result->data;

		$shorturl = $result->url;

		

		// Store the shortened URL

		if (!empty($shorturl) && $post_id > 0)

		{

			$post = get_post($post_id);

			//return print_r($post, true);

			if ($post->post_status != 'draft' && $post->post_type != 'revision')

				update_post_meta($post_id, 'rta-shorturl', $shorturl);

		}

		

		return $shorturl;

	}

	

	// Administration notices

	function admin_notices()

	{

		$this->notices = array_unique($this->notices);

		foreach($this->notices as $key => $value)

		{

			echo "<div id='rta-info' class='updated fade'><p><strong>Retweet Anywhere</strong>: " . $value . "</p></div>";

		}

	}

}



// Used for manual mode (PHP)

function retweet_anywhere() {

	echo do_shortcode("[retweet-anywhere]");

}



// Initialize the environment

add_action("init", create_function('', 'global $RetweetAnywhere; $RetweetAnywhere = new RetweetAnywhere();'));

add_action("widgets_init", create_function('', 'return register_widget("RetweetAnywhereWidget");'));