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Diffstat (limited to 'extlib/Services/oEmbed.php')
| -rw-r--r-- | extlib/Services/oEmbed.php | 357 |
1 files changed, 357 insertions, 0 deletions
diff --git a/extlib/Services/oEmbed.php b/extlib/Services/oEmbed.php new file mode 100644 index 000000000..5d38ed883 --- /dev/null +++ b/extlib/Services/oEmbed.php @@ -0,0 +1,357 @@ +<?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(); + } + } + + /** + * 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($code, 0, 1) != '2') { + throw new Services_oEmbed_Exception('Non-200 code returned'); + } + + curl_close($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="' . + '(application/json|text/xml)\+oembed"([^>]*)>#i'; + + $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('/href="([^"]+)"/i', $link, $h)) { + $ret[$m[2][$i]] = $h[1]; + } + } + + return (isset($ret['json']) ? $ret['json'] : array_pop($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'); + } + + return $result; + } +} + +?> |