1<?php
2
3/**
4 * Mail functions
5 *
6 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
7 * @author     Andreas Gohr <andi@splitbrain.org>
8 */
9
10/**
11 * Patterns for use in email detection and validation
12 *
13 * NOTE: there is an unquoted '/' in RFC2822_ATEXT, it must remain unquoted to be used in the parser
14 * the pattern uses non-capturing groups as captured groups aren't allowed in the parser
15 * select pattern delimiters with care!
16 *
17 * May not be completly RFC conform!
18 * @link http://www.faqs.org/rfcs/rfc2822.html (paras 3.4.1 & 3.2.4)
19 *
20 * @author Chris Smith <chris@jalakai.co.uk>
21 * Check if a given mail address is valid
22 */
23if (!defined('RFC2822_ATEXT')) define('RFC2822_ATEXT', "0-9a-zA-Z!#$%&'*+/=?^_`{|}~-");
24if (!defined('PREG_PATTERN_VALID_EMAIL')) define(
25    'PREG_PATTERN_VALID_EMAIL',
26    '[' . RFC2822_ATEXT . ']+(?:\.[' . RFC2822_ATEXT . ']+)*@(?i:[0-9a-z][0-9a-z-]*\.)+(?i:[a-z]{2,63})'
27);
28
29/**
30 * Prepare mailfrom replacement patterns
31 *
32 * Also prepares a mailfromnobody config that contains an autoconstructed address
33 * if the mailfrom one is userdependent and this might not be wanted (subscriptions)
34 *
35 * @author Andreas Gohr <andi@splitbrain.org>
36 */
37function mail_setup()
38{
39    global $conf;
40    global $USERINFO;
41    /** @var Input $INPUT */
42    global $INPUT;
43
44    // auto constructed address
45    $host = @parse_url(DOKU_URL, PHP_URL_HOST);
46    if (!$host) $host = 'example.com';
47    $noreply = 'noreply@' . $host;
48
49    $replace = [];
50    if (!empty($USERINFO['mail'])) {
51        $replace['@MAIL@'] = $USERINFO['mail'];
52    } else {
53        $replace['@MAIL@'] = $noreply;
54    }
55
56    // use 'noreply' if no user
57    $replace['@USER@'] = $INPUT->server->str('REMOTE_USER', 'noreply', true);
58
59    if (!empty($USERINFO['name'])) {
60        $replace['@NAME@'] = $USERINFO['name'];
61    } else {
62        $replace['@NAME@'] = '';
63    }
64
65    // apply replacements
66    $from = str_replace(
67        array_keys($replace),
68        array_values($replace),
69        $conf['mailfrom']
70    );
71
72    // any replacements done? set different mailfromnone
73    if ($from != $conf['mailfrom']) {
74        $conf['mailfromnobody'] = $noreply;
75    } else {
76        $conf['mailfromnobody'] = $from;
77    }
78    $conf['mailfrom'] = $from;
79}
80
81/**
82 * Check if a given mail address is valid
83 *
84 * @param   string $email the address to check
85 * @return  bool          true if address is valid
86 */
87function mail_isvalid($email)
88{
89    return EmailAddressValidator::checkEmailAddress($email, true);
90}
91
92/**
93 * Quoted printable encoding
94 *
95 * @author umu <umuAThrz.tu-chemnitz.de>
96 * @link   http://php.net/manual/en/function.imap-8bit.php#61216
97 *
98 * @param string $sText
99 * @param int $maxlen
100 * @param bool $bEmulate_imap_8bit
101 *
102 * @return string
103 */
104function mail_quotedprintable_encode($sText, $maxlen = 74, $bEmulate_imap_8bit = true)
105{
106    // split text into lines
107    $aLines = preg_split("/(?:\r\n|\r|\n)/", $sText);
108    $cnt = count($aLines);
109
110    for ($i = 0; $i < $cnt; $i++) {
111        $sLine =& $aLines[$i];
112        if ($sLine === '') continue; // do nothing, if empty
113
114        $sRegExp = '/[^\x09\x20\x21-\x3C\x3E-\x7E]/e';
115
116        // imap_8bit encodes x09 everywhere, not only at lineends,
117        // for EBCDIC safeness encode !"#$@[\]^`{|}~,
118        // for complete safeness encode every character :)
119        if ($bEmulate_imap_8bit)
120            $sRegExp = '/[^\x20\x21-\x3C\x3E-\x7E]/';
121
122        $sLine = preg_replace_callback($sRegExp, 'mail_quotedprintable_encode_callback', $sLine);
123
124        // encode x09,x20 at lineends
125        {
126            $iLength = strlen($sLine);
127            $iLastChar = ord($sLine[$iLength - 1]);
128
129            //              !!!!!!!!
130            // imap_8_bit does not encode x20 at the very end of a text,
131            // here is, where I don't agree with imap_8_bit,
132            // please correct me, if I'm wrong,
133            // or comment next line for RFC2045 conformance, if you like
134        if (!($bEmulate_imap_8bit && ($i == count($aLines) - 1))) {
135            if (($iLastChar == 0x09) || ($iLastChar == 0x20)) {
136                $sLine[$iLength - 1] = '=';
137                $sLine .= ($iLastChar == 0x09) ? '09' : '20';
138            }
139        }
140        }    // imap_8bit encodes x20 before chr(13), too
141        // although IMHO not requested by RFC2045, why not do it safer :)
142        // and why not encode any x20 around chr(10) or chr(13)
143        if ($bEmulate_imap_8bit) {
144            $sLine = str_replace(' =0D', '=20=0D', $sLine);
145            //$sLine=str_replace(' =0A','=20=0A',$sLine);
146            //$sLine=str_replace('=0D ','=0D=20',$sLine);
147            //$sLine=str_replace('=0A ','=0A=20',$sLine);
148        }
149
150        // finally split into softlines no longer than $maxlen chars,
151        // for even more safeness one could encode x09,x20
152        // at the very first character of the line
153        // and after soft linebreaks, as well,
154        // but this wouldn't be caught by such an easy RegExp
155        if ($maxlen) {
156            preg_match_all('/.{1,' . ($maxlen - 2) . '}([^=]{0,2})?/', $sLine, $aMatch);
157            $sLine = implode('=' . MAILHEADER_EOL, $aMatch[0]); // add soft crlf's
158        }
159    }
160
161    // join lines into text
162    return implode(MAILHEADER_EOL, $aLines);
163}
164
165function mail_quotedprintable_encode_callback($matches)
166{
167    return sprintf("=%02X", ord($matches[0])) ;
168}
169