285 lines
8.8 KiB
PHP
285 lines
8.8 KiB
PHP
<?php
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/**
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* Show a HubbleSite daily image as a widget.
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*/
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class DailyImageWidget {
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/**
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* Initialize the widget.
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* For unit testing purposes, you can disable remote data loading by passing true to this function.
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* @param boolean $skip_load_data True if data from the remote server should not be loaded.
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*/
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function DailyImageWidget($skip_load_data = false) {
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$this->default_display_options = array(
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'title',
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'image'
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);
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$this->_cache_time = 86400;
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$this->_source_stamp = "&f=wpw";
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$this->data_source = "http://hubblesite.org/gallery/album/daily_image.php";
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$this->has_simplexml = class_exists('SimpleXMLElement');
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$this->_valid_column_names = array('title', 'date', 'image_url', 'gallery_url', 'credits');
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$this->_valid_options = array(
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"image" => __("Daily Image", "hubblesite-daily-image-widget"),
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"title" => __("Image Title", "hubblesite-daily-image-widget"),
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"credits" => __("Credits", "hubblesite-daily-image-widget")
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);
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add_action('init', array($this, "_init"));
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}
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/**
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* WordPress init hook.
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*/
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function _init() {
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wp_register_sidebar_widget(
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'hubblesite-daily-image',
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__("HubbleSite Daily Image", "hubblesite-daily-image-widget"),
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array(&$this, "render"),
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array(
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'description' => __('Embed a daily HubbleSite Gallery image on your WordPress blog.', 'hubblesite-daily-image-widget')
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)
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);
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register_widget_control(__("HubbleSite Daily Image", "hubblesite-daily-image-widget"), array(&$this, "render_ui"));
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if (!$skip_load_data) {
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if (!$this->_load_data()) {
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add_action("admin_notices", array(&$this, "_connection_warning"));
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}
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} else {
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$this->data = false;
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}
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$this->handle_post();
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$this->get_display_options();
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}
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/**
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* Display a warning if the connection failed.
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*/
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function _connection_warning() {
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echo "<div class=\"updated fade\">";
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_e("<strong>HubbleSite Daily Image Widget</strong> was unable to retrieve new data from HubbleSite.", "hubblesite-daily-image-widget");
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_e("The widget will appear as empty in your site until data can be downloaded again.", "hubblesite-daily-image-widget");
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echo "</div>";
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}
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/**
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* Wrapper around a remote data call for unit testing purposes.
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* @return string The data from the remote source.
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*/
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function _get_from_data_source() {
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$response = wp_remote_request($this->data_source, array('method' => 'GET'));
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if (!is_wp_error($response)) {
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if (isset($response['body'])) {
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return $response['body'];
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}
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}
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return false;
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}
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/**
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* Load the remote data into the object.
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* This will try to pull from cache and, if necessary, retrieve and parse the XML from the
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* remote server. If any of this fails, returns false.
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* @return boolean True if data could be loaded, false otherwise.
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*/
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function _load_data() {
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if (($result = $this->_get_cached_data()) === false) {
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if (($xml_text = $this->_get_from_data_source()) !== false) {
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if (($result = $this->parse_xml($xml_text)) !== false) {
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update_option('hubblesite-daily-image-cache', array(time(), $result));
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return true;
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}
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}
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return false;
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} else {
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return true;
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}
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}
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/**
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* Handle updating the widget options.
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*/
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function handle_post() {
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if (isset($_POST['hubblesite']['_wpnonce'])) {
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if (wp_verify_nonce($_POST['hubblesite']['_wpnonce'], 'hubble')) {
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$options = array();
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foreach ($this->_valid_options as $option => $label) {
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if (isset($_POST['hubblesite'][$option])) {
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$options[] = $option;
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}
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}
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$this->display_options = $options;
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update_option('hubblesite-daily-image-options', implode(",", $this->display_options));
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}
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}
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}
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/**
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* Get the list of display options from the WordPress options database.
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*/
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function get_display_options() {
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$display_options = get_option('hubblesite-daily-image-options');
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$this->display_options = array();
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if (!empty($display_options)) {
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$this->display_options = array_intersect(explode(",", $display_options), array_keys($this->_valid_options));
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}
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if (empty($this->display_options)) {
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$this->display_options = $this->default_display_options;
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}
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update_option('hubblesite-daily-image-options', implode(",", $this->display_options));
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return $this->display_options;
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}
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/**
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* Render the widget.
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* @param array $args The theme's widget layout arguments.
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*/
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function render($args) {
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if (!empty($this->data) && is_array($this->data)) {
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extract($args);
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$options = $this->get_display_options();
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echo $before_widget;
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echo $before_title;
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echo "HubbleSite Daily Image";
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echo $after_title;
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if (in_array("image", $options)) {
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echo '<a href="' . $this->data['gallery_url'] . $this->_source_stamp . '" title="' . $this->data['title'] . '">';
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echo '<img src="' . $this->data['image_url'] . '" alt="' . $this->data['title'] . '" width="100%" />';
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echo '</a>';
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}
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if (in_array("title", $options)) {
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echo '<a id="hubblesite-daily-image-title" href="' . $this->data['gallery_url'] . $this->_source_stamp . '">';
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echo $this->_fix_widows($this->data['title']);
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echo '</a>';
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}
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if (in_array("credits", $options)) {
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echo '<div id="hubblesite-daily-image-credits">';
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echo $this->_fix_widows($this->data['credits']);
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echo '</div>';
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}
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echo $after_widget;
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}
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}
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/**
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* Render the widget admin UI.
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*/
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function render_ui() {
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echo "<input type=\"hidden\" name=\"hubblesite[_wpnonce]\" value=\"" . wp_create_nonce('hubble') . "\" />";
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echo "<p>";
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_e("Show on Widget <em>(must select at least one)</em>:", "hubblesite-daily-image-widget");
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echo "</p>";
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foreach ($this->_valid_options as $option => $label) {
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echo "<label>";
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echo "<input type=\"checkbox\" name=\"hubblesite[${option}]\" " . (in_array($option, $this->display_options) ? "checked=\"checked\"" : "") . "/> ";
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echo $label;
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echo "</label>";
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echo "<br />";
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}
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}
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/**
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* Parse a string of XML from the HubbleSite Daily Gallery Image feed.
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* This will try to use SimpleXML if vailable. If not, will fall back on Expat.
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* @param string $xml_text The text to parse.
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* @return array|boolean The retrieved data, or false on failure.
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*/
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function parse_xml($xml_text) {
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$parser = xml_parser_create();
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$this->_character_data = "";
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$this->_xml_data = array();
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xml_set_element_handler(
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$parser,
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array(&$this, "_start_element_handler"),
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array(&$this, "_end_element_handler")
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);
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xml_set_character_data_handler($parser, array(&$this, "_character_data_handler"));
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xml_parser_set_option($parser, XML_OPTION_SKIP_WHITE, 1);
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$this->data = false;
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if (xml_parse($parser, $xml_text)) {
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if (count($this->_xml_data) == count($this->_valid_column_names)) {
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$this->data = $this->_xml_data;
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}
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}
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return $this->data;
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}
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/**
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* Expat start element handler.
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*/
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function _start_element_handler($parser, $name, $attributes) {
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$this->_character_data = "";
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}
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/**
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* Expat end element handler.
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*/
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function _end_element_handler($parser, $name) {
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$name = strtolower($name);
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if (in_array($name, $this->_valid_column_names)) {
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$this->_xml_data[$name] = $this->_character_data;
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}
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$this->_character_data = "";
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}
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/**
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* Expat character data handler.
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*/
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function _character_data_handler($parser, $data) {
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$this->_character_data .= $data;
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}
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/**
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* Retrieve the cached data from WP Options.
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* @return array|boolean The cached data or false upon failure.
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*/
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function _get_cached_data() {
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if (($result = get_option('hubblesite-daily-image-cache')) !== false) {
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list($timestamp, $cached_data) = $result;
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if (($timestamp + $this->_cache_time) > time()) {
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$is_valid = true;
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foreach ($this->_valid_column_names as $field) {
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if (!isset($cached_data[$field])) { $is_valid = false; break; }
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}
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if ($is_valid) {
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$this->data = $cached_data;
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return $cached_data;
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}
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}
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}
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return false;
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}
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/**
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* Try to ensure that no words in a paragraph or link are widowed.
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* @param string $text The text to process.
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* @return string The processed text.
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*/
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function _fix_widows($text) {
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return preg_replace("#([^\ ]+)\ ([^\ \>]+)($|</p>|</a>)#", '\1 \2\3', $text);
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}
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}
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function the_hubblesite_daily_image_widget() {
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$diw = new DailyImageWidget();
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$diw->render();
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}
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?>
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