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-rw-r--r--extlib/Services/oEmbed.php357
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-<?php
-
-/**
- * An interface for oEmbed consumption
- *
- * PHP version 5.1.0+
- *
- * Copyright (c) 2008, Digg.com, Inc.
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * - Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * - Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * - Neither the name of Digg.com, Inc. nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- * @category Services
- * @package Services_oEmbed
- * @author Joe Stump <joe@joestump.net>
- * @copyright 2008 Digg.com, Inc.
- * @license http://tinyurl.com/42zef New BSD License
- * @version SVN: @version@
- * @link http://code.google.com/p/digg
- * @link http://oembed.com
- */
-
-require_once 'Validate.php';
-require_once 'Net/URL2.php';
-require_once 'HTTP/Request.php';
-require_once 'Services/oEmbed/Exception.php';
-require_once 'Services/oEmbed/Exception/NoSupport.php';
-require_once 'Services/oEmbed/Object.php';
-
-/**
- * Base class for consuming oEmbed objects
- *
- * <code>
- * <?php
- *
- * require_once 'Services/oEmbed.php';
- *
- * // The URL that we'd like to find out more information about.
- * $url = 'http://flickr.com/photos/joestump/2848795611/';
- *
- * // The oEmbed API URI. Not all providers support discovery yet so we're
- * // explicitly providing one here. If one is not provided Services_oEmbed
- * // attempts to discover it. If none is found an exception is thrown.
- * $oEmbed = new Services_oEmbed($url, array(
- * Services_oEmbed::OPTION_API => 'http://www.flickr.com/services/oembed/'
- * ));
- * $object = $oEmbed->getObject();
- *
- * // All of the objects have somewhat sane __toString() methods that allow
- * // you to output them directly.
- * echo (string)$object;
- *
- * ?>
- * </code>
- *
- * @category Services
- * @package Services_oEmbed
- * @author Joe Stump <joe@joestump.net>
- * @copyright 2008 Digg.com, Inc.
- * @license http://tinyurl.com/42zef New BSD License
- * @version Release: @version@
- * @link http://code.google.com/p/digg
- * @link http://oembed.com
- */
-class Services_oEmbed
-{
- /**
- * HTTP timeout in seconds
- *
- * All HTTP requests made by Services_oEmbed will respect this timeout.
- * This can be passed to {@link Services_oEmbed::setOption()} or to the
- * options parameter in {@link Services_oEmbed::__construct()}.
- *
- * @var string OPTION_TIMEOUT Timeout in seconds
- */
- const OPTION_TIMEOUT = 'http_timeout';
-
- /**
- * HTTP User-Agent
- *
- * All HTTP requests made by Services_oEmbed will be sent with the
- * string set by this option.
- *
- * @var string OPTION_USER_AGENT The HTTP User-Agent string
- */
- const OPTION_USER_AGENT = 'http_user_agent';
-
- /**
- * The API's URI
- *
- * If the API is known ahead of time this option can be used to explicitly
- * set it. If not present then the API is attempted to be discovered
- * through the auto-discovery mechanism.
- *
- * @var string OPTION_API
- */
- const OPTION_API = 'oembed_api';
-
- /**
- * Options for oEmbed requests
- *
- * @var array $options The options for making requests
- */
- protected $options = array(
- self::OPTION_TIMEOUT => 3,
- self::OPTION_API => null,
- self::OPTION_USER_AGENT => 'Services_oEmbed 0.1.0'
- );
-
- /**
- * URL of object to get embed information for
- *
- * @var object $url {@link Net_URL2} instance of URL of object
- */
- protected $url = null;
-
- /**
- * Constructor
- *
- * @param string $url The URL to fetch an oEmbed for
- * @param array $options A list of options for the oEmbed lookup
- *
- * @throws {@link Services_oEmbed_Exception} if the $url is invalid
- * @throws {@link Services_oEmbed_Exception} when no valid API is found
- * @return void
- */
- public function __construct($url, array $options = array())
- {
- if (Validate::uri($url)) {
- $this->url = new Net_URL2($url);
- } else {
- throw new Services_oEmbed_Exception('URL is invalid');
- }
-
- if (count($options)) {
- foreach ($options as $key => $val) {
- $this->setOption($key, $val);
- }
- }
-
- if ($this->options[self::OPTION_API] === null) {
- $this->options[self::OPTION_API] = $this->discover($url);
- }
- }
-
- /**
- * Set an option for the oEmbed request
- *
- * @param mixed $option The option name
- * @param mixed $value The option value
- *
- * @see Services_oEmbed::OPTION_API, Services_oEmbed::OPTION_TIMEOUT
- * @throws {@link Services_oEmbed_Exception} on invalid option
- * @access public
- * @return void
- */
- public function setOption($option, $value)
- {
- switch ($option) {
- case self::OPTION_API:
- case self::OPTION_TIMEOUT:
- break;
- default:
- throw new Services_oEmbed_Exception(
- 'Invalid option "' . $option . '"'
- );
- }
-
- $func = '_set_' . $option;
- if (method_exists($this, $func)) {
- $this->options[$option] = $this->$func($value);
- } else {
- $this->options[$option] = $value;
- }
- }
-
- /**
- * Set the API option
- *
- * @param string $value The API's URI
- *
- * @throws {@link Services_oEmbed_Exception} on invalid API URI
- * @see Validate::uri()
- * @return string
- */
- protected function _set_oembed_api($value)
- {
- if (!Validate::uri($value)) {
- throw new Services_oEmbed_Exception(
- 'API URI provided is invalid'
- );
- }
-
- return $value;
- }
-
- /**
- * Get the oEmbed response
- *
- * @param array $params Optional parameters for
- *
- * @throws {@link Services_oEmbed_Exception} on cURL errors
- * @throws {@link Services_oEmbed_Exception} on HTTP errors
- * @throws {@link Services_oEmbed_Exception} when result is not parsable
- * @return object The oEmbed response as an object
- */
- public function getObject(array $params = array())
- {
- $params['url'] = $this->url->getURL();
- if (!isset($params['format'])) {
- $params['format'] = 'json';
- }
-
- $sets = array();
- foreach ($params as $var => $val) {
- $sets[] = $var . '=' . urlencode($val);
- }
-
- $url = $this->options[self::OPTION_API] . '?' . implode('&', $sets);
-
- $ch = curl_init();
- curl_setopt($ch, CURLOPT_URL, $url);
- curl_setopt($ch, CURLOPT_HEADER, false);
- curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
- curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $this->options[self::OPTION_TIMEOUT]);
- $result = curl_exec($ch);
-
- if (curl_errno($ch)) {
- throw new Services_oEmbed_Exception(
- curl_error($ch), curl_errno($ch)
- );
- }
-
- $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
- if (substr($code, 0, 1) != '2') {
- throw new Services_oEmbed_Exception('Non-200 code returned. Got code ' . $code);
- }
-
- curl_close($ch);
-
- switch ($params['format']) {
- case 'json':
- $res = json_decode($result);
- if (!is_object($res)) {
- throw new Services_oEmbed_Exception(
- 'Could not parse JSON response'
- );
- }
- break;
- case 'xml':
- libxml_use_internal_errors(true);
- $res = simplexml_load_string($result);
- if (!$res instanceof SimpleXMLElement) {
- $errors = libxml_get_errors();
- $err = array_shift($errors);
- libxml_clear_errors();
- libxml_use_internal_errors(false);
- throw new Services_oEmbed_Exception(
- $err->message, $error->code
- );
- }
- break;
- }
-
- return Services_oEmbed_Object::factory($res);
- }
-
- /**
- * Discover an oEmbed API
- *
- * @param string $url The URL to attempt to discover oEmbed for
- *
- * @throws {@link Services_oEmbed_Exception} if the $url is invalid
- * @return string The oEmbed API endpoint discovered
- */
- protected function discover($url)
- {
- $body = $this->sendRequest($url);
-
- // Find all <link /> tags that have a valid oembed type set. We then
- // extract the href attribute for each type.
- $regexp = '#<link([^>]*)type[\s\n]*=[\s\n]*"' .
- '(application/json|text/xml)\+oembed"([^>]*)>#im';
-
- $m = $ret = array();
- if (!preg_match_all($regexp, $body, $m)) {
- throw new Services_oEmbed_Exception_NoSupport(
- 'No valid oEmbed links found on page'
- );
- }
-
- foreach ($m[0] as $i => $link) {
- $h = array();
- if (preg_match('/[\s\n]+href[\s\n]*=[\s\n]*"([^"]+)"/im', $link, $h)) {
- $ret[$m[2][$i]] = $h[1];
- }
- }
-
- return (isset($ret['application/json']) ? $ret['application/json'] : array_pop($ret));
- }
-
- /**
- * Send a GET request to the provider
- *
- * @param mixed $url The URL to send the request to
- *
- * @throws {@link Services_oEmbed_Exception} on HTTP errors
- * @return string The contents of the response
- */
- private function sendRequest($url)
- {
- $ch = curl_init();
- curl_setopt($ch, CURLOPT_URL, $url);
- curl_setopt($ch, CURLOPT_HEADER, false);
- curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
- curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $this->options[self::OPTION_TIMEOUT]);
- curl_setopt($ch, CURLOPT_USERAGENT, $this->options[self::OPTION_USER_AGENT]);
- $result = curl_exec($ch);
- if (curl_errno($ch)) {
- throw new Services_oEmbed_Exception(
- curl_error($ch), curl_errno($ch)
- );
- }
-
- $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
- if (substr($code, 0, 1) != '2') {
- throw new Services_oEmbed_Exception('Non-200 code returned. Got code ' . $code);
- }
-
- return $result;
- }
-}
-
-?>
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