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annotate common.php @ 13:cccd73f72bf6 draft

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Added filtering support and several bugfixes
author Ivo Smits <Ivo@UCIS.nl>
date Thu, 10 Jul 2014 22:26:45 +0200
parents 7917bd536187
children 372f4e195986
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 <?php
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2 /* Copyright 2010 Ivo Smits <Ivo@UCIS.nl>. All rights reserved.
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3 Redistribution and use in source and binary forms, with or without modification, are
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4 permitted provided that the following conditions are met:
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5
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6 1. Redistributions of source code must retain the above copyright notice, this list of
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7 conditions and the following disclaimer.
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8
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9 2. Redistributions in binary form must reproduce the above copyright notice, this list
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10 of conditions and the following disclaimer in the documentation and/or other materials
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11 provided with the distribution.
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12
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13 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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14 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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15 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR
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16 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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17 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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18 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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19 ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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20 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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21 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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22
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23 The views and conclusions contained in the software and documentation are those of the
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24 authors and should not be interpreted as representing official policies, either expressed
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25 or implied, of Ivo Smits.*/
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26
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27 $pnewss_hooks = array('article_stored' => array(), 'article_filter' => array());
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28
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29 require_once './pdo.php';
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30 require_once './config.php';
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31
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32 function nntp_readline($socket) {
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33 $line = fgets($socket);
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34 if ($line === FALSE || $line === NULL) return $line;
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35 $line = rtrim($line, "\r\n");
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36 writelog('R: '.$line);
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37 return $line;
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38 }
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39 function nntp_writeline_data($socket, $line) {
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40 if (strlen($line) && $line[0] == '.') $line = '.'.$line;
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41 nntp_writeline($socket, $line);
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42 }
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43 function nntp_writeline($socket, $line) {
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44 writelog('W: '.$line);
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45 $line .= "\r\n";
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46 while (strlen($line)) {
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47 $written = fwrite($socket, $line);
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48 if ($written === FALSE || $written <= 0) throw new Exception('Write operation failed');
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49 $line = substr($line, $written);
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50 }
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51 }
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52 function nntp_readlines($socket) {
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53 $line = nntp_readline($socket);
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54 $lines = array();
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55 while ($line != '.' && $line !== FALSE && $line !== FALSE) {
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56 if (strlen($line) && $line[0] == '.') $line = substr($line, 1);
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57 $lines[] = $line;
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58 $line = nntp_readline($socket);
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59 }
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60 if ($line != '.') throw new Exception('Unexpected end of message');
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61 return $lines;
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62 }
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63
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64 function pnewss_call_hooks($hooks, $args) {
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65 foreach ($hooks as $hook) call_user_func_array($hook, $args);
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66 }
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67 function pnewss_call_filter_hooks($hooks, $args) {
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68 foreach ($hooks as $hook) if (!call_user_func_array($hook, $args)) return FALSE;
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69 return TRUE;
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70 }
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71
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72 function nntp_article_wanted($messageid) {
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73 global $db, $pnewss_hooks;
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74 if ($db->evalRow('SELECT `id` FROM `messages` WHERE `messageid` = ?', $messageid) !== FALSE) return FALSE;
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75 if (!pnewss_call_filter_hooks($pnewss_hooks['article_filter'], array(array('messageid' => $messageid)))) return FALSE;
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76 return TRUE;
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77 }
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78
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79 function nntp_article_store($lines, $header = array()) {
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80 global $db, $pnewss_hooks;
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81 $headers = array();
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82 if (!count($header)) {
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83 while (count($lines)) {
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84 $line = array_shift($lines);
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85 if (!strlen($line)) break;
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86 $header[] = $line;
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87 }
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88 }
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89 $headername = NULL;
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90 foreach ($header as $headerid => $line) {
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91 if (!strlen($line)) throw new Exception('Empty header line');
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92 if (strpos($line, "\r") !== FALSE || strpos($line, "\n") !== FALSE || strpos($line, "\0")) throw new Exception('Invalid newline or NUL character in header line');
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93 if (strlen($line) && strlen($headername) && ($line[0] == ' ' || $line[0] == "\t") && isset($headers[$headername])) {
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94 $headers[$headername] .= ' '.trim($line, " \t");
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95 unset($header[$headerid]);
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96 continue;
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97 }
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98 $parts = explode(': ', $line, 2);
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99 $headername = strtoupper($parts[0]);
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100 switch ($headername) {
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101 case 'PATH': case 'FROM': case 'NEWSGROUPS': case 'SUBJECT': case 'DATE': case 'MESSAGE-ID': case 'SENDER':
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102 if (isset($headers[$headername])) throw new Exception('Duplicate header: '.$headername);
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103 $headers[$headername] = $parts[1];
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104 unset($header[$headerid]);
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105 break;
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106 case 'ORGANIZATION': case 'LINES':
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107 case 'MIME-VERSION': case 'CONTENT-TYPE': case 'CONTENT-TRANSFER-ENCODING': case 'USER-AGENT':
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108 case 'REFERENCES': case 'REPLY-TO': case 'FOLLOWUP-TO': case 'IN-REPLY-TO':
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109 case 'EXPIRES': case 'CONTROL': case 'DISTRIBUTION': case 'KEYWORDS': case 'SUMMARY':
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110 break;
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111 case 'NNTP-POSTING-HOST': case 'X-TRACE': case 'XREF': case 'X-COMPLAINTS-TO':
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112 case 'NNTP-POSTING-DATE':
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113 unset($header[$headerid]);
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114 $line = NULL;
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115 break;
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116 default:
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117 if ($headername[0] == 'X' && $headername[1] == '-') break;
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118 writelog("Received unknown header $headername");
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119 }
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120 }
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121 foreach ($lines as $line) {
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122 if (strpos($line, "\r") !== FALSE || strpos($line, "\n") !== FALSE || strpos($line, "\0")) throw new Exception('Invalid newline or NUL character in body line');
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123 }
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124 if (!isset($headers['NEWSGROUPS'])) throw new Exception('Missing required Newsgroups header');
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125 $newsgroups = array();
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126 foreach (explode(',', $headers['NEWSGROUPS']) as $groupname) {
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127 $group = $db->evalRowAssoc('SELECT * FROM `groups` WHERE `name` = ?', $groupname);
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128 if ($group === FALSE) continue;
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129 $newsgroups[] = $group['id'];
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130 }
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131 if (!count($newsgroups)) throw new Exception('No known newsgroups listed');
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132 if (!isset($headers['MESSAGE-ID'])) $headers['MESSAGE-ID'] = '<'.md5(time().rand()).'@pNewss.Core.UCIS.nl>';
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133 if (!isset($headers['DATE'])) $headers['DATE'] = gmdate('r');
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134 $messageid = $headers['MESSAGE-ID'];
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135 if (strlen($messageid) < 3 || strlen($messageid) > 250 || $messageid[0] != '<' || strpos($messageid, '>') !== strlen($messageid) - 1) throw new Exception('Bad Message-ID');
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136 $messageid = substr($messageid, 1, -1);
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137 $article = $db->evalRowAssoc('SELECT * FROM `messages` WHERE `messageid` = ?', $messageid);
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138 if ($article !== FALSE) throw new Exception('Duplicate');
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139 $headers['PATH'] = 'pNewss.Core.UCIS.nl'.(isset($headers['PATH'])?'!'.$headers['PATH']:'');
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140 foreach (array('Path', 'From', 'Newsgroups', 'Subject', 'Date', 'Message-ID', 'Sender') as $headername) {
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141 if (isset($headers[strtoupper($headername)])) $header[] = $headername.': '.$headers[strtoupper($headername)];
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142 }
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143 if (!pnewss_call_filter_hooks($pnewss_hooks['article_filter'], array(array('messageid' => $messageid, 'headers' => $headers, 'body' => $lines)))) throw new Exception('Filtered');
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144 $headertext = implode("\r\n", $header);
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145 $bodytext = implode("\r\n", $lines);
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146 if (strlen($headertext) > 65535 || strlen($bodytext) > 16777215) throw new Exception('Message too big');
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147 $id = $db->insert('INSERT INTO `messages` (`messageid`, `header`, `body`) VALUES (?, ?, ?)', array($messageid, $headertext, $bodytext));
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148 foreach ($newsgroups as $groupid) $db->insert('INSERT INTO `groupmessages` (`group`, `message`) VALUES (?, ?)', array($groupid, $id));
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149 pnewss_call_hooks($pnewss_hooks['article_stored'], array(array('messageid' => $messageid, 'headers' => $headers, 'body' => $lines, 'dbid' => $id)));
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150 return $messageid;
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151 }