671 lines
20 KiB
PHP
671 lines
20 KiB
PHP
<?php
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/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
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/**
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* PHP support for the Libravatar.org service.
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*
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* PHP version 5
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*
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* The MIT License
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*
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* Copyright (c) 2011 Services_Libravatar committers.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* @category Services
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* @package Services_Libravatar
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* @author Melissa Draper <melissa@meldraweb.com>
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* @copyright 2011 Services_Libravatar committers.
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* @license http://www.opensource.org/licenses/mit-license.html MIT License
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* @link http://pear.php.net/package/Services_Libravatar
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* @since File available since Release 0.1.0
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*/
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/**
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* PHP support for the Libravatar.org service.
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*
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* Using this class is easy. After including or requiring
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* Services/Libravatar.php simply do:
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* <code>
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* $libravatar = new Services_Libravatar();
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* $url = $libravatar->getUrl('melissa@meldraweb.com');
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* </code>
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*
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* This would populate $url with the string:
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* <code>
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* http://cdn.libravatar.org/avatar/4db84629c121f2d443d33bdb9fd149bc
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* </code>
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*
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* A complicated lookup using all the options is:
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* <code>
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* $libravatar = new Services_Libravatar();
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* $libravatar->setSize(40);
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* $libravatar->setAlgorithm('sha256');
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* $libravatar->setHttps(true);
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* $libravatar->setDefault(
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* 'http://upload.wikimedia.org/wikipedia/commons/a/af/Tux.png'
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* );
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* $url = $libravatar->getUrl('melissa@meldraweb.com');
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* </code>
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*
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* @category Services
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* @package Services_Libravatar
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* @author Melissa Draper <melissa@meldraweb.com>
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* @copyright 2011 Services_Libravatar committers.
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* @license http://www.opensource.org/licenses/mit-license.html MIT License
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* @version Release: 0.2.1
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* @link http://pear.php.net/package/Services_Libravatar
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* @since Class available since Release 0.1.0
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*/
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class Services_Libravatar
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{
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/**
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* Hashing algorithm to use
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*
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* @var string
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* @see processAlgorithm()
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* @see setAlgorithm()
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*/
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protected $algorithm = 'md5';
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/**
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* Default image URL to use
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*
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* @var string
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* @see processDefault()
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* @see setDefault()
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*/
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protected $default;
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/**
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* If HTTPS URLs should be used
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*
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* @var boolean
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* @see detectHttps()
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* @see setHttps()
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*/
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protected $https;
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/**
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* Image size in pixels
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*
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* @var integer
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* @see processSize()
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* @see setSize()
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*/
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protected $size;
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/**
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* Composes a URL for the identifier and options passed in
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*
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* Compose a full URL as specified by the Libravatar API, based on the
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* email address or openid URL passed in, and the options specified.
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*
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* @param string $identifier a string of either an email address
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* or an openid url
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* @param array $options an array of (bool) https, (string) algorithm
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* (string) size, (string) default.
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* See the set* methods.
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*
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* @return string A string of a full URL for an avatar image
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*
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* @since Method available since Release 0.2.0
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* @deprecated Use getUrl() instead
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*/
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public function url($identifier, $options = array())
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{
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return $this->getUrl($identifier, $options);
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}
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/**
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* Composes a URL for the identifier and options passed in
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*
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* Compose a full URL as specified by the Libravatar API, based on the
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* email address or openid URL passed in, and the options specified.
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*
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* @param string $identifier a string of either an email address
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* or an openid url
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* @param array $options an array of (bool) https, (string) algorithm
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* (string) size, (string) default.
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* See the set* methods.
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*
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* @return string A string of a full URL for an avatar image
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*
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* @since Method available since Release 0.2.0
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* @throws InvalidArgumentException When an invalid option is passed
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*/
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public function getUrl($identifier, $options = array())
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{
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// If no identifier has been passed, set it to a null.
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// This way, there'll always be something returned.
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if (!$identifier) {
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$identifier = null;
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} else {
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$identifier = $this->normalizeIdentifier($identifier);
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}
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// Load all options
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$options = $this->checkOptionsArray($options);
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$https = $this->https;
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if (isset($options['https'])) {
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$https = (bool)$options['https'];
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}
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$algorithm = $this->algorithm;
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if (isset($options['algorithm'])) {
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$algorithm = $this->processAlgorithm($options['algorithm']);
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}
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$default = $this->default;
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if (isset($options['default'])) {
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$default = $this->processDefault($options['default']);
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}
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$size = $this->size;
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if (isset($options['size'])) {
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$size = $this->processSize($options['size']);
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}
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$identifierHash = $this->identifierHash($identifier, $algorithm);
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// Get the domain so we can determine the SRV stuff for federation
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$domain = $this->domainGet($identifier);
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// If https has been specified in $options, make sure we make the
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// correct SRV lookup
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$service = $this->srvGet($domain, $https);
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$protocol = $https ? 'https' : 'http';
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$params = array();
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if ($size !== null) {
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$params['size'] = $size;
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}
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if ($default !== null) {
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$params['default'] = $default;
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}
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$paramString = '';
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if (count($params) > 0) {
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$paramString = '?' . http_build_query($params);
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}
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// Compose the URL from the pieces we generated
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$url = $protocol . '://' . $service . '/avatar/' . $identifierHash
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. $paramString;
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// Return the URL string
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return $url;
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}
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/**
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* Checks the options array and verify that only allowed options are in it.
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*
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* @param array $options Array of options for getUrl()
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*
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* @return void
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* @throws Exception When an invalid option is used
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*/
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protected function checkOptionsArray($options)
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{
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//this short options are deprecated!
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if (isset($options['s'])) {
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$options['size'] = $options['s'];
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unset($options['s']);
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}
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if (isset($options['d'])) {
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$options['default'] = $options['d'];
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unset($options['d']);
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}
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$allowedOptions = array(
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'algorithm' => true,
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'default' => true,
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'https' => true,
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'size' => true,
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);
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foreach ($options as $key => $value) {
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if (!isset($allowedOptions[$key])) {
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throw new InvalidArgumentException(
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'Invalid option in array: ' . $key
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);
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}
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}
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return $options;
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}
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/**
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* Normalizes the identifier (E-mail address or OpenID)
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*
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* @param string $identifier E-Mail address or OpenID
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*
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* @return string Normalized identifier
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*/
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protected function normalizeIdentifier($identifier)
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{
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if (filter_var($identifier, FILTER_VALIDATE_EMAIL)) {
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return strtolower($identifier);
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} else {
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return self::normalizeOpenId($identifier);
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}
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}
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/**
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* Create a hash of the identifier.
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*
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* Create a hash of the email address or openid passed in. Algorithm
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* used for email address ONLY can be varied. Either md5 or sha256
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* are supported by the Libravatar API. Will be ignored for openid.
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*
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* @param string $identifier A string of the email address or openid URL
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* @param string $hash A string of the hash algorithm type to make
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* Uses the php implementation of hash()
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* MD5 preferred for Gravatar fallback
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*
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* @return string A string hash of the identifier.
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*
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* @since Method available since Release 0.1.0
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*/
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protected function identifierHash($identifier, $hash = 'md5')
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{
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if (filter_var($identifier, FILTER_VALIDATE_EMAIL) || $identifier === null) {
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// If email, we can select our algorithm. Default to md5 for
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// gravatar fallback.
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return hash($hash, $identifier);
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}
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//no email, so the identifier has to be an OpenID
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return hash('sha256', $identifier);
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}
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/**
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* Normalizes an identifier (URI or XRI)
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*
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* @param mixed $identifier URI or XRI to be normalized
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*
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* @return string Normalized Identifier.
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* Empty string when the OpenID is invalid.
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*
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* @internal Adapted from OpenID::normalizeIdentifier()
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*/
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public static function normalizeOpenId($identifier)
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{
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// XRI
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if (preg_match('@^xri://@i', $identifier)) {
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return preg_replace('@^xri://@i', '', $identifier);
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}
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if (in_array($identifier[0], array('=', '@', '+', '$', '!'))) {
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return $identifier;
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}
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// URL
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if (!preg_match('@^http[s]?://@i', $identifier)) {
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$identifier = 'http://' . $identifier;
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}
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if (strpos($identifier, '/', 8) === false) {
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$identifier .= '/';
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}
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if (!filter_var($identifier, FILTER_VALIDATE_URL)) {
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return '';
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}
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$parts = parse_url($identifier);
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$parts['scheme'] = strtolower($parts['scheme']);
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$parts['host'] = strtolower($parts['host']);
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//http://openid.net/specs/openid-authentication-2_0.html#normalization
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return $parts['scheme'] . '://'
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. (isset($parts['user']) ? $parts['user'] : '')
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. (isset($parts['pass']) ? ':' . $parts['pass'] : '')
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. (isset($parts['user']) || isset($parts['pass']) ? '@' : '')
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. $parts['host']
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. (
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(isset($parts['port'])
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&& $parts['scheme'] === 'http' && $parts['port'] != 80)
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|| (isset($parts['port'])
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&& $parts['scheme'] === 'https' && $parts['port'] != 443)
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? ':' . $parts['port'] : ''
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)
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. $parts['path']
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. (isset($parts['query']) ? '?' . $parts['query'] : '');
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//leave out fragment as requested by the spec
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}
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/**
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* Grab the domain from the identifier.
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*
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* Extract the domain from the Email or OpenID.
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*
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* @param string $identifier A string of the email address or openid URL
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*
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* @return string A string of the domain to use
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*
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* @since Method available since Release 0.1.0
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*/
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protected function domainGet($identifier)
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{
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if ($identifier === null) {
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return null;
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}
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// What are we, email or openid? Split ourself up and get the
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// important bit out.
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if (filter_var($identifier, FILTER_VALIDATE_EMAIL)) {
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$email = explode('@', $identifier);
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return $email[1];
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}
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//OpenID
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$url = parse_url($identifier);
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$domain = $url['host'];
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if (isset($url['port']) && $url['scheme'] === 'http'
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&& $url['port'] != 80
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|| isset($url['port']) && $url['scheme'] === 'https'
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&& $url['port'] != 443
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) {
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$domain .= ':' . $url['port'];
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}
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return $domain;
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}
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/**
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* Get the target to use.
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*
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* Get the SRV record, filtered by priority and weight. If our domain
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* has no SRV records, fall back to Libravatar.org
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*
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* @param string $domain A string of the domain we extracted from the
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* provided identifier with domainGet()
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* @param boolean $https Whether or not to look for https records
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*
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* @return string The target URL.
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*
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* @since Method available since Release 0.1.0
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*/
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protected function srvGet($domain, $https = false)
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{
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// Are we going secure? Set up a fallback too.
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if (isset($https) && $https === true) {
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$subdomain = '_avatars-sec._tcp.';
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$fallback = 'seccdn.';
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} else {
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$subdomain = '_avatars._tcp.';
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$fallback = 'cdn.';
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}
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// Lets try get us some records based on the choice of subdomain
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// and the domain we had passed in.
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$srv = dns_get_record($subdomain . $domain, DNS_SRV);
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// Did we get anything? No?
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if (count($srv) == 0) {
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// Then let's try Libravatar.org.
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return $fallback . 'libravatar.org';
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}
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// Sort by the priority. We must get the lowest.
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usort($srv, array($this, 'comparePriority'));
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$top = $srv[0];
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$sum = 0;
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// Try to adhere to RFC2782's weighting algorithm, page 3
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// "arrange all SRV RRs (that have not been ordered yet) in any order,
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// except that all those with weight 0 are placed at the beginning of
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// the list."
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shuffle($srv);
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$srvs = array();
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foreach ($srv as $s) {
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if ($s['weight'] == 0) {
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array_unshift($srvs, $s);
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} else {
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array_push($srvs, $s);
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}
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}
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foreach ($srvs as $s) {
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if ($s['pri'] == $top['pri']) {
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// "Compute the sum of the weights of those RRs"
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$sum += (int) $s['weight'];
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// "and with each RR associate the running sum in the selected
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// order."
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$pri[$sum] = $s;
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}
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}
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// "Then choose a uniform random number between 0 and the sum computed
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// (inclusive)"
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$random = rand(0, $sum);
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// "and select the RR whose running sum value is the first in the selected
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// order which is greater than or equal to the random number selected"
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foreach ($pri as $k => $v) {
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if ($k >= $random) {
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return $v['target'];
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}
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}
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}
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/**
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* Sorting function for record priorities.
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*
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* @param mixed $a A mixed value passed by usort()
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* @param mixed $b A mixed value passed by usort()
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*
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* @return mixed The result of the comparison
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*
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* @since Method available since Release 0.1.0
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*/
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protected function comparePriority($a, $b)
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{
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return $a['pri'] - $b['pri'];
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}
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/**
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* Automatically set the https option depending on the current connection
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* value.
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*
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* If the current connection is HTTPS, the https options is activated.
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* If it is not HTTPS, the https option is deactivated.
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*
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* @return self
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*/
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public function detectHttps()
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{
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$this->setHttps(
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isset($_SERVER['HTTPS']) && $_SERVER['HTTPS']
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);
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return $this;
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}
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/**
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* Verify and cast the email address hashing algorithm to use.
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*
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* @param string $algorithm Algorithm to use, "sha256" or "md5".
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*
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* @return string Algorithm
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*
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* @throws InvalidArgumentException When an unsupported algorithm is given
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*/
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protected function processAlgorithm($algorithm)
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{
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$algorithm = (string)$algorithm;
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if ($algorithm !== 'md5' && $algorithm !== 'sha256') {
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throw new InvalidArgumentException(
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'Only md5 and sha256 hashing supported'
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);
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}
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return $algorithm;
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}
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/**
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* Verify and cast the default URL to use when no avatar image can be found.
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* If none is set, the libravatar logo is returned.
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*
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* @param string $url Full URL to use OR one of the following:
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* - "404" - give a "404 File not found" instead of an image
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* - "mm"
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* - "identicon"
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* - "monsterid"
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* - "wavatar"
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* - "retro"
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*
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* @return string Default URL
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*
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* @throws InvalidArgumentException When an invalid URL is given
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*/
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protected function processDefault($url)
|
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{
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if ($url === null) {
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return $url;
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}
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$url = (string)$url;
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switch ($url) {
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case '404':
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case 'mm':
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case 'identicon':
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case 'monsterid':
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case 'wavatar':
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case 'retro':
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case 'robohash':
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case 'pagan':
|
|
break;
|
|
default:
|
|
$valid = filter_var($url, FILTER_VALIDATE_URL);
|
|
if (!$valid) {
|
|
throw new InvalidArgumentException('Invalid default avatar URL');
|
|
}
|
|
break;
|
|
}
|
|
|
|
return $url;
|
|
}
|
|
|
|
/**
|
|
* Verify and cast the required size of the images.
|
|
*
|
|
* @param integer $size Size (width and height in pixels) of the image.
|
|
* NULL for the default width.
|
|
*
|
|
* @return integer Size
|
|
*
|
|
* @throws InvalidArgumentException When a size <= 0 is given
|
|
*/
|
|
protected function processSize($size)
|
|
{
|
|
if ($size === null) {
|
|
return $size;
|
|
}
|
|
|
|
$size = (int)$size;
|
|
if ($size <= 0) {
|
|
throw new InvalidArgumentException('Size has to be larger than 0');
|
|
}
|
|
|
|
return (int)$size;
|
|
}
|
|
|
|
|
|
/**
|
|
* Set the email address hashing algorithm to use.
|
|
* To keep gravatar compatibility, use "md5".
|
|
*
|
|
* @param string $algorithm Algorithm to use, "sha256" or "md5".
|
|
*
|
|
* @return self
|
|
* @throws InvalidArgumentException When an unsupported algorithm is given
|
|
*/
|
|
public function setAlgorithm($algorithm)
|
|
{
|
|
$this->algorithm = $this->processAlgorithm($algorithm);
|
|
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Set the default URL to use when no avatar image can be found.
|
|
* If none is set, the gravatar logo is returned.
|
|
*
|
|
* @param string $url Full URL to use OR one of the following:
|
|
* - "404" - give a "404 File not found" instead of an image
|
|
* - "mm"
|
|
* - "identicon"
|
|
* - "monsterid"
|
|
* - "wavatar"
|
|
* - "retro"
|
|
*
|
|
* @return self
|
|
* @throws InvalidArgumentException When an invalid URL is given
|
|
*/
|
|
public function setDefault($url)
|
|
{
|
|
$this->default = $this->processDefault($url);
|
|
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Set if HTTPS URLs shall be returned.
|
|
*
|
|
* @param boolean $useHttps If HTTPS url shall be returned
|
|
*
|
|
* @return self
|
|
*
|
|
* @see detectHttps()
|
|
*/
|
|
public function setHttps($useHttps)
|
|
{
|
|
$this->https = (bool)$useHttps;
|
|
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Set the required size of the images.
|
|
* Every avatar image is square sized, which means you need to set only number.
|
|
*
|
|
* @param integer $size Size (width and height) of the image
|
|
*
|
|
* @return self
|
|
* @throws InvalidArgumentException When a size <= 0 is given
|
|
*/
|
|
public function setSize($size)
|
|
{
|
|
$this->size = $this->processSize($size);
|
|
|
|
return $this;
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
* Local variables:
|
|
* tab-width: 4
|
|
* c-basic-offset: 4
|
|
* c-hanging-comment-ender-p: nil
|
|
* End:
|
|
*/
|
|
|
|
?>
|