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