1 | <?php |
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2 | # -- BEGIN LICENSE BLOCK --------------------------------------- |
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3 | # |
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4 | # This file is part of Dotclear 2. |
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5 | # |
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6 | # Copyright (c) 2003-2013 Olivier Meunier & Association Dotclear |
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7 | # Licensed under the GPL version 2.0 license. |
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8 | # See LICENSE file or |
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9 | # http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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10 | # |
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11 | # -- END LICENSE BLOCK ----------------------------------------- |
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12 | if (!defined('DC_RC_PATH')) { return; } |
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13 | |
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14 | /** |
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15 | @ingroup DC_CORE |
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16 | @brief Trackbacks/Pingbacks sender and server |
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17 | |
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18 | Sends and receives trackbacks/pingbacks. Also handles trackbacks/pingbacks auto discovery. |
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19 | */ |
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20 | class dcTrackback |
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21 | { |
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22 | public $core; ///< <b>dcCore</b> dcCore instance |
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23 | public $table; ///< <b>string</b> done pings table name |
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24 | |
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25 | /** |
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26 | Object constructor |
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27 | |
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28 | @param core <b>dcCore</b> dcCore instance |
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29 | */ |
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30 | public function __construct($core) |
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31 | { |
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32 | $this->core =& $core; |
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33 | $this->con =& $this->core->con; |
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34 | $this->table = $this->core->prefix.'ping'; |
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35 | } |
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36 | |
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37 | /// @name Send trackbacks |
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38 | //@{ |
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39 | /** |
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40 | Get all pings sent for a given post. |
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41 | |
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42 | @param post_id <b>integer</b> Post ID |
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43 | @return <b>record</b> |
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44 | */ |
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45 | public function getPostPings($post_id) |
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46 | { |
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47 | $strReq = 'SELECT ping_url, ping_dt '. |
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48 | 'FROM '.$this->table.' '. |
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49 | 'WHERE post_id = '.(integer) $post_id; |
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50 | |
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51 | return $this->con->select($strReq); |
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52 | } |
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53 | |
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54 | /** |
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55 | Sends a ping to given <var>$url</var>. |
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56 | |
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57 | @param url <b>string</b> URL to ping |
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58 | @param post_id <b>integer</b> Post ID |
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59 | @param post_title <b>string</b> Post title |
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60 | @param post_excerpt <b>string</b> Post excerpt |
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61 | @param post_url <b>string</b> Post URL |
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62 | */ |
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63 | public function ping($url,$post_id,$post_title,$post_excerpt,$post_url) |
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64 | { |
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65 | if ($this->core->blog === null) { |
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66 | return false; |
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67 | } |
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68 | |
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69 | $post_id = (integer) $post_id; |
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70 | |
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71 | # Check for previously done trackback |
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72 | $strReq = 'SELECT post_id, ping_url FROM '.$this->table.' '. |
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73 | 'WHERE post_id = '.$post_id.' '. |
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74 | "AND ping_url = '".$this->con->escape($url)."' "; |
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75 | |
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76 | $rs = $this->con->select($strReq); |
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77 | |
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78 | if (!$rs->isEmpty()) { |
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79 | throw new Exception(sprintf(__('%s has still been pinged'),$url)); |
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80 | } |
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81 | |
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82 | $ping_parts = explode('|',$url); |
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83 | |
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84 | # Let's walk by the trackback way |
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85 | if (count($ping_parts) < 2) { |
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86 | $data = array( |
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87 | 'title' => $post_title, |
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88 | 'excerpt' => $post_excerpt, |
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89 | 'url' => $post_url, |
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90 | 'blog_name' => trim(html::escapeHTML(html::clean($this->core->blog->name))) |
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91 | //,'__debug' => false |
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92 | ); |
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93 | |
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94 | # Ping |
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95 | try |
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96 | { |
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97 | $http = self::initHttp($url,$path); |
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98 | $http->post($path,$data,'UTF-8'); |
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99 | $res = $http->getContent(); |
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100 | } |
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101 | catch (Exception $e) |
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102 | { |
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103 | throw new Exception(__('Unable to ping URL')); |
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104 | } |
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105 | |
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106 | $pattern = |
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107 | '|<response>.*<error>(.*)</error>(.*)'. |
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108 | '(<message>(.*)</message>(.*))?'. |
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109 | '</response>|msU'; |
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110 | |
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111 | if (!preg_match($pattern,$res,$match)) |
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112 | { |
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113 | throw new Exception(sprintf(__('%s is not a ping URL'),$url)); |
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114 | } |
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115 | |
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116 | $ping_error = trim($match[1]); |
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117 | $ping_msg = (!empty($match[4])) ? $match[4] : ''; |
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118 | } |
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119 | # Damnit ! Let's play pingback |
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120 | else { |
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121 | try { |
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122 | $xmlrpc = new xmlrpcClient($ping_parts[0]); |
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123 | $res = $xmlrpc->query('pingback.ping', $post_url, $ping_parts[1]); |
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124 | $ping_error = '0'; |
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125 | } |
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126 | catch (xmlrpcException $e) { |
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127 | $ping_error = $e->getCode(); |
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128 | $ping_msg = $e->getMessage(); |
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129 | } |
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130 | catch (Exception $e) { |
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131 | throw new Exception(__('Unable to ping URL')); |
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132 | } |
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133 | } |
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134 | |
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135 | if ($ping_error != '0') { |
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136 | throw new Exception(sprintf(__('%s, ping error:'),$url).' '.$ping_msg); |
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137 | } else { |
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138 | # Notify ping result in database |
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139 | $cur = $this->con->openCursor($this->table); |
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140 | $cur->post_id = $post_id; |
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141 | $cur->ping_url = $url; |
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142 | $cur->ping_dt = date('Y-m-d H:i:s'); |
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143 | |
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144 | $cur->insert(); |
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145 | } |
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146 | } |
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147 | //@} |
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148 | |
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149 | private function pingAlreadyDone($post_id, $from_url) |
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150 | { |
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151 | $params = array( |
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152 | 'post_id' => $post_id, |
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153 | 'comment_site' => $from_url, |
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154 | 'comment_trackback' => 1, |
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155 | ); |
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156 | |
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157 | $rs = $this->core->blog->getComments($params, true); |
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158 | if ($rs && !$rs->isEmpty()) { |
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159 | return ($rs->f(0)); |
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160 | } |
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161 | |
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162 | return false; |
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163 | } |
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164 | |
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165 | private function addBacklink($post_id, $url, $blog_name, $title, $excerpt, &$comment) |
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166 | { |
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167 | if (empty($blog_name)) { |
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168 | $blog_name = 'Anonymous blog'; |
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169 | } |
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170 | |
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171 | $comment = |
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172 | "<!-- TB -->\n". |
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173 | '<p><strong>'.($title ? $title : $blog_name)."</strong></p>\n". |
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174 | '<p>'.$excerpt.'</p>'; |
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175 | |
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176 | $cur = $this->core->con->openCursor($this->core->prefix.'comment'); |
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177 | $cur->comment_author = (string) $blog_name; |
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178 | $cur->comment_site = (string) $url; |
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179 | $cur->comment_content = (string) $comment; |
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180 | $cur->post_id = $post_id; |
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181 | $cur->comment_trackback = 1; |
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182 | $cur->comment_status = $this->core->blog->settings->system->trackbacks_pub ? 1 : -1; |
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183 | $cur->comment_ip = http::realIP(); |
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184 | |
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185 | # --BEHAVIOR-- publicBeforeTrackbackCreate |
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186 | $this->core->callBehavior('publicBeforeTrackbackCreate',$cur); |
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187 | if ($cur->post_id) { |
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188 | $comment_id = $this->core->blog->addComment($cur); |
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189 | |
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190 | # --BEHAVIOR-- publicAfterTrackbackCreate |
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191 | $this->core->callBehavior('publicAfterTrackbackCreate',$cur,$comment_id); |
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192 | } |
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193 | } |
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194 | |
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195 | /// @name Receive trackbacks |
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196 | //@{ |
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197 | /** |
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198 | Receives a trackback and insert it as a comment of given post. |
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199 | |
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200 | @param post_id <b>integer</b> Post ID |
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201 | */ |
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202 | public function receive($post_id) |
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203 | { |
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204 | header('Content-Type: text/xml; charset=UTF-8'); |
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205 | if (empty($_POST)) { |
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206 | http::head(405,'Method Not Allowed'); |
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207 | echo |
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208 | '<?xml version="1.0" encoding="utf-8"?>'."\n". |
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209 | "<response>\n". |
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210 | " <error>1</error>\n". |
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211 | " <message>POST request needed</message>\n". |
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212 | "</response>"; |
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213 | return; |
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214 | } |
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215 | |
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216 | $post_id = (integer) $post_id; |
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217 | |
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218 | $title = !empty($_POST['title']) ? $_POST['title'] : ''; |
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219 | $excerpt = !empty($_POST['excerpt']) ? $_POST['excerpt'] : ''; |
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220 | $url = !empty($_POST['url']) ? $_POST['url'] : ''; |
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221 | $blog_name = !empty($_POST['blog_name']) ? $_POST['blog_name'] : ''; |
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222 | $charset = ''; |
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223 | $comment = ''; |
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224 | |
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225 | $err = false; |
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226 | $msg = ''; |
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227 | |
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228 | if ($this->core->blog === null) |
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229 | { |
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230 | $err = true; |
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231 | $msg = 'No blog.'; |
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232 | } |
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233 | elseif ($url == '') |
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234 | { |
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235 | $err = true; |
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236 | $msg = 'URL parameter is required.'; |
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237 | } |
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238 | elseif ($blog_name == '') { |
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239 | $err = true; |
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240 | $msg = 'Blog name is required.'; |
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241 | } |
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242 | |
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243 | if (!$err) |
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244 | { |
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245 | $post = $this->core->blog->getPosts(array('post_id'=>$post_id,'post_type'=>'')); |
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246 | |
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247 | if ($post->isEmpty()) |
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248 | { |
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249 | $err = true; |
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250 | $msg = 'No such post.'; |
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251 | } |
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252 | elseif (!$post->trackbacksActive()) |
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253 | { |
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254 | $err = true; |
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255 | $msg = 'Trackbacks are not allowed for this post or weblog.'; |
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256 | } |
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257 | |
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258 | $url = trim(html::clean($url)); |
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259 | if ($this->pingAlreadyDone($post->post_id, $url)) { |
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260 | $err = true; |
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261 | $msg = 'The trackback has already been registered'; |
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262 | } |
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263 | } |
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264 | |
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265 | if (!$err) |
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266 | { |
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267 | $charset = self::getCharsetFromRequest(); |
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268 | |
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269 | if (!$charset) { |
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270 | $charset = self::detectCharset($title.' '.$excerpt.' '.$blog_name); |
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271 | } |
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272 | |
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273 | if (strtolower($charset) != 'utf-8') { |
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274 | $title = iconv($charset,'UTF-8',$title); |
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275 | $excerpt = iconv($charset,'UTF-8',$excerpt); |
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276 | $blog_name = iconv($charset,'UTF-8',$blog_name); |
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277 | } |
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278 | |
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279 | $title = trim(html::clean($title)); |
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280 | $title = html::decodeEntities($title); |
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281 | $title = html::escapeHTML($title); |
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282 | $title = text::cutString($title,60); |
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283 | |
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284 | $excerpt = trim(html::clean($excerpt)); |
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285 | $excerpt = html::decodeEntities($excerpt); |
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286 | $excerpt = preg_replace('/\s+/ms',' ',$excerpt); |
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287 | $excerpt = text::cutString($excerpt,252); |
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288 | $excerpt = html::escapeHTML($excerpt).'...'; |
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289 | |
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290 | $blog_name = trim(html::clean($blog_name)); |
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291 | $blog_name = html::decodeEntities($blog_name); |
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292 | $blog_name = html::escapeHTML($blog_name); |
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293 | $blog_name = text::cutString($blog_name,60); |
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294 | |
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295 | try |
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296 | { |
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297 | $this->addBacklink($post_id, $url, $blog_name, $title, $excerpt, $comment); |
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298 | } |
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299 | catch (Exception $e) |
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300 | { |
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301 | $err = 1; |
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302 | $msg = 'Something went wrong : '.$e->getMessage(); |
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303 | } |
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304 | } |
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305 | |
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306 | $resp = |
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307 | '<?xml version="1.0" encoding="utf-8"?>'."\n". |
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308 | "<response>\n". |
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309 | ' <error>'.(integer) $err."</error>\n"; |
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310 | |
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311 | if ($msg) { |
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312 | $resp .= ' <message>'.$msg."</message>\n"; |
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313 | } |
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314 | |
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315 | if (!empty($_POST['__debug'])) { |
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316 | $resp .= |
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317 | " <debug>\n". |
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318 | ' <title>'.$title."</title>\n". |
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319 | ' <excerpt>'.$excerpt."</excerpt>\n". |
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320 | ' <url>'.$url."</url>\n". |
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321 | ' <blog_name>'.$blog_name."</blog_name>\n". |
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322 | ' <charset>'.$charset."</charset>\n". |
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323 | ' <comment>'.$comment."</comment>\n". |
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324 | " </debug>\n"; |
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325 | } |
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326 | |
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327 | echo $resp."</response>"; |
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328 | } |
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329 | //@} |
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330 | |
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331 | /// @name Receive pingbacks |
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332 | //@{ |
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333 | /** |
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334 | Receives a pingback and insert it as a comment of given post. |
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335 | |
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336 | @param from_url <b>string</b> Source URL |
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337 | @param to_url <b>string</b> Target URL |
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338 | */ |
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339 | public function receive_pb($from_url, $to_url) |
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340 | { |
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341 | $reg = '!^'.preg_quote($this->core->blog->url).'(.*)!'; |
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342 | $type = $args = $next = ''; |
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343 | |
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344 | # Are you dumb? |
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345 | if (!preg_match($reg, $to_url, $m)) { |
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346 | throw new Exception(__('Any chance you ping one of my contents? No? Really?'), 0); |
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347 | } |
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348 | |
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349 | # Does the targeted URL look like a registered post type? |
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350 | $url_part = $m[1]; |
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351 | $p_type = ''; |
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352 | $post_types = $this->core->getPostTypes(); |
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353 | foreach ($post_types as $k => $v) { |
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354 | $reg = '!^'.preg_quote(str_replace('%s', '', $v['public_url'])).'(.*)!'; |
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355 | if (preg_match($reg, $url_part, $n)) { |
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356 | $p_type = $k; |
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357 | $post_url = $n[1]; |
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358 | break; |
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359 | } |
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360 | } |
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361 | |
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362 | if (empty($p_type)) { |
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363 | throw new Exception(__('Sorry but you can not ping this type of content.'), 33); |
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364 | } |
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365 | |
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366 | # Time to see if we've got a winner... |
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367 | $params = array( |
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368 | 'post_type' => $p_type, |
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369 | 'post_url' => $post_url, |
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370 | ); |
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371 | $posts = $this->core->blog->getPosts($params); |
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372 | |
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373 | # Missed! |
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374 | if ($posts->isEmpty()) { |
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375 | throw new Exception(__('Oops. Kinda "not found" stuff. Please check the target URL twice.'), 33); |
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376 | } |
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377 | |
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378 | # Nice try. But, sorry, no. |
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379 | if (!$posts->trackbacksActive()) { |
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380 | throw new Exception(__('Sorry, dude. This entry does not accept pingback at the moment.'), 33); |
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381 | } |
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382 | |
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383 | if ($this->pingAlreadyDone($posts->post_id, $from_url)) { |
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384 | throw new Exception(__('Don\'t repeat yourself, please.'), 48); |
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385 | } |
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386 | |
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387 | # OK. We've found our champion. Time to check the remote part. |
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388 | try { |
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389 | $http = self::initHttp($from_url, $from_path); |
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390 | |
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391 | # First round : just to be sure the ping comes from an acceptable resource type. |
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392 | $http->setHeadersOnly(true); |
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393 | $http->get($from_path); |
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394 | $c_type = explode(';', $http->getHeader('content-type')); |
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395 | |
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396 | # Bad luck. Bye, bye... |
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397 | if (!in_array($c_type[0],array('text/html', 'application/xhtml+xml'))) { |
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398 | throw new Exception(__('Your source URL does not look like a supported content type. Sorry. Bye, bye!'), 0); |
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399 | } |
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400 | |
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401 | # Second round : let's go fetch and parse the remote content |
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402 | $http->setHeadersOnly(false); |
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403 | $http->get($from_path); |
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404 | $remote_content = $http->getContent(); |
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405 | |
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406 | $charset = self::getCharsetFromRequest($http->getHeader('content-type')); |
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407 | |
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408 | if (!$charset) { |
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409 | $charset = self::detectCharset($remote_content); |
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410 | } |
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411 | |
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412 | if (strtolower($charset) != 'utf-8') { |
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413 | $remote_content = iconv($charset,'UTF-8',$remote_content); |
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414 | } |
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415 | |
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416 | # We want a title... |
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417 | if (!preg_match('!<title>([^<].*?)</title>!mis', $remote_content, $m)) { |
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418 | throw new Exception(__('Where\'s your title?'), 0); |
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419 | } |
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420 | $title = trim(html::clean($m[1])); |
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421 | $title = html::decodeEntities($title); |
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422 | $title = html::escapeHTML($title); |
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423 | $title = text::cutString($title,60); |
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424 | |
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425 | preg_match('!<body[^>]*?>(.*)?</body>!msi', $remote_content, $m); |
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426 | $source = $m[1]; |
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427 | $source = preg_replace('![\r\n\s]+!ms',' ',$source); |
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428 | $source = preg_replace( "/<\/*(h\d|p|th|td|li|dt|dd|pre|caption|input|textarea|button)[^>]*>/", "\n\n", $source ); |
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429 | $source = strip_tags($source, '<a>'); |
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430 | $source = explode("\n\n",$source); |
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431 | |
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432 | $excerpt = ''; |
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433 | foreach ($source as $line) { |
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434 | if (strpos($line, $to_url) !== false) { |
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435 | if (preg_match("!<a[^>]+?".$to_url."[^>]*>([^>]+?)</a>!", $line, $m)) { |
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436 | $excerpt = strip_tags($line); |
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437 | break; |
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438 | } |
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439 | } |
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440 | } |
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441 | if ($excerpt) { |
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442 | $excerpt = '(…) '.text::cutString(html::escapeHTML($excerpt),200).' (…)'; |
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443 | } |
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444 | else { |
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445 | $excerpt = '(…)'; |
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446 | } |
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447 | |
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448 | $this->addBacklink($posts->post_id, $from_url, '', $title, $excerpt, $comment); |
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449 | } |
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450 | catch (Exception $e) { |
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451 | throw new Exception(__('Sorry, an internal problem has occured.'), 0); |
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452 | } |
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453 | |
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454 | return __('Thanks, mate. It was a pleasure.'); |
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455 | } |
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456 | //@} |
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457 | |
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458 | private static function initHttp($url,&$path) |
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459 | { |
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460 | $client = netHttp::initClient($url,$path); |
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461 | $client->setTimeout(5); |
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462 | $client->setUserAgent('Dotclear - http://www.dotclear.org/'); |
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463 | $client->useGzip(false); |
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464 | $client->setPersistReferers(false); |
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465 | |
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466 | return $client; |
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467 | } |
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468 | |
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469 | private static function getCharsetFromRequest($header = '') |
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470 | { |
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471 | if (!$header && isset($_SERVER['CONTENT_TYPE'])) { |
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472 | $header = $_SERVER['CONTENT_TYPE']; |
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473 | } |
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474 | |
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475 | if ($header) { |
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476 | if (preg_match('|charset=([a-zA-Z0-9-]+)|',$header,$m)) { |
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477 | return $m[1]; |
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478 | } |
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479 | } |
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480 | |
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481 | return null; |
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482 | } |
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483 | |
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484 | private static function detectCharset($string) |
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485 | { |
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486 | return mb_detect_encoding($remote_content, |
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487 | 'UTF-8,ISO-8859-1,ISO-8859-2,ISO-8859-3,'. |
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488 | 'ISO-8859-4,ISO-8859-5,ISO-8859-6,ISO-8859-7,ISO-8859-8,'. |
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489 | 'ISO-8859-9,ISO-8859-10,ISO-8859-13,ISO-8859-14,ISO-8859-15'); |
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490 | } |
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491 | |
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492 | /// @name Trackbacks auto discovery |
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493 | //@{ |
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494 | /** |
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495 | Returns an array containing all discovered trackbacks URLs in |
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496 | <var>$text</var>. |
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497 | |
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498 | @param text <b>string</b> Input text |
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499 | @return <b>array</b> |
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500 | */ |
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501 | public function discover($text) |
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502 | { |
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503 | $res = array(); |
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504 | |
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505 | foreach ($this->getTextLinks($text) as $link) |
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506 | { |
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507 | if (($url = $this->getPingURL($link)) !== null) { |
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508 | $res[] = $url; |
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509 | } |
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510 | } |
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511 | |
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512 | return $res; |
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513 | } |
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514 | //@} |
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515 | |
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516 | private function getTextLinks($text) |
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517 | { |
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518 | $res = array(); |
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519 | |
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520 | # href attribute on "a" tags |
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521 | if (preg_match_all('/<a ([^>]+)>/ms', $text, $match, PREG_SET_ORDER)) |
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522 | { |
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523 | for ($i = 0; $i<count($match); $i++) |
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524 | { |
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525 | if (preg_match('/href="((https?:\/)?\/[^"]+)"/ms', $match[$i][1], $matches)) { |
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526 | $res[$matches[1]] = 1; |
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527 | } |
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528 | } |
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529 | } |
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530 | unset($match); |
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531 | |
---|
532 | # cite attributes on "blockquote" and "q" tags |
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533 | if (preg_match_all('/<(blockquote|q) ([^>]+)>/ms', $text, $match, PREG_SET_ORDER)) |
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534 | { |
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535 | for ($i = 0; $i<count($match); $i++) |
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536 | { |
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537 | if (preg_match('/cite="((https?:\/)?\/[^"]+)"/ms', $match[$i][2], $matches)) { |
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538 | $res[$matches[1]] = 1; |
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539 | } |
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540 | } |
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541 | } |
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542 | |
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543 | return array_keys($res); |
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544 | } |
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545 | |
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546 | private function getPingURL($url) |
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547 | { |
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548 | if (strpos($url,'/') === 0) { |
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549 | $url = http::getHost().$url; |
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550 | } |
---|
551 | |
---|
552 | try |
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553 | { |
---|
554 | $http = self::initHttp($url,$path); |
---|
555 | $http->get($path); |
---|
556 | $page_content = $http->getContent(); |
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557 | $pb_url = $http->getHeader('x-pingback'); |
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558 | } |
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559 | catch (Exception $e) |
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560 | { |
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561 | return false; |
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562 | } |
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563 | |
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564 | # If we've got a X-Pingback header and it's a valid URL, it will be enough |
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565 | if ($pb_url && filter_var($pb_url,FILTER_VALIDATE_URL) && preg_match('!^https?:!',$pb_url)) { |
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566 | return $pb_url.'|'.$url; |
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567 | } |
---|
568 | |
---|
569 | # No X-Pingback header. A link rel=pingback, maybe ? |
---|
570 | $pattern_pingback = '!<link rel="pingback" href="(.*?)"( /)?>!msi'; |
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571 | |
---|
572 | if (preg_match($pattern_pingback,$page_content,$m)) { |
---|
573 | $pb_url = $m[1]; |
---|
574 | if (filter_var($pb_url,FILTER_VALIDATE_URL) && preg_match('!^https?:!',$pb_url)) { |
---|
575 | return $pb_url.'|'.$url; |
---|
576 | } |
---|
577 | } |
---|
578 | |
---|
579 | # No pingback ? OK, let's check for a trackback data chunk... |
---|
580 | $pattern_rdf = |
---|
581 | '/<rdf:RDF.*?>.*?'. |
---|
582 | '<rdf:Description\s+(.*?)\/>'. |
---|
583 | '.*?<\/rdf:RDF>'. |
---|
584 | '/msi'; |
---|
585 | |
---|
586 | preg_match_all($pattern_rdf,$page_content,$rdf_all,PREG_SET_ORDER); |
---|
587 | |
---|
588 | $url_path = parse_url($url, PHP_URL_PATH); |
---|
589 | $sanitized_url = str_replace($url_path, html::sanitizeURL($url_path), $url); |
---|
590 | |
---|
591 | for ($i=0; $i<count($rdf_all); $i++) |
---|
592 | { |
---|
593 | $rdf = $rdf_all[$i][1]; |
---|
594 | if (preg_match('/dc:identifier="'.preg_quote($url,'/').'"/msi',$rdf) || |
---|
595 | preg_match('/dc:identifier="'.preg_quote($sanitized_url,'/').'"/msi',$rdf)) { |
---|
596 | if (preg_match('/trackback:ping="(.*?)"/msi',$rdf,$tb_link)) { |
---|
597 | return $tb_link[1]; |
---|
598 | } |
---|
599 | } |
---|
600 | } |
---|
601 | |
---|
602 | return null; |
---|
603 | } |
---|
604 | } |
---|
605 | ?> |
---|