xref: /dokuwiki/vendor/openpsa/universalfeedcreator/lib/Creator/MBOXCreator.php (revision 3dc2d50c5fda9c4bf708ff4c26e266ba239af62c) 
1<?php
2
3/**
4 * MBOXCreator is a FeedCreator that implements the mbox format
5 * as described in http://www.qmail.org/man/man5/mbox.html
6 *
7 * @since   1.3
8 * @author  Kai Blankenhorn <kaib@bitfolge.de>
9 * @package de.bitfolge.feedcreator
10 */
11class MBOXCreator extends FeedCreator
12{
13
14    /**
15     * MBOXCreator constructor.
16     */
17    public function __construct()
18    {
19        $this->contentType = "text/plain";
20        $this->encoding = "ISO-8859-15";
21    }
22
23    /**
24     * Quoted Printable encoding
25     *
26     * @param string $input
27     * @param int $line_max wrap lines after these number of characters
28     * @return string
29     */
30    protected function qp_enc($input = "", $line_max = 76)
31    {
32        $hex = array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F');
33        $lines = preg_split("/(?:\r\n|\r|\n)/", $input);
34        $eol = "\r\n";
35        $escape = "=";
36        $output = "";
37        foreach ($lines as $line) {
38            $linlen = strlen($line);
39            $newline = "";
40            for ($i = 0; $i < $linlen; $i++) {
41                $c = substr($line, $i, 1);
42                $dec = ord($c);
43                if (($dec == 32) && ($i == ($linlen - 1))) { // convert space at eol only
44                    $c = "=20";
45                } elseif (($dec == 61) || ($dec < 32) || ($dec > 126)) { // always encode "\t", which is *not* required
46                    $h2 = floor($dec / 16);
47                    $h1 = floor($dec % 16);
48                    $c = $escape.$hex["$h2"].$hex["$h1"];
49                }
50                if ((strlen($newline) + strlen($c)) >= $line_max) { // CRLF is not counted
51                    $output .= $newline.$escape.$eol; // soft line break; " =\r\n" is okay
52                    $newline = "";
53                }
54                $newline .= $c;
55            } // end of for
56            $output .= $newline.$eol;
57        }
58
59        return trim($output);
60    }
61
62    /**
63     * Builds the MBOX contents.
64     *
65     * @inheritdoc
66     */
67    public function createFeed()
68    {
69        $feed = '';
70        for ($i = 0; $i < count($this->items); $i++) {
71            if ($this->items[$i]->author != "") {
72                $from = $this->items[$i]->author;
73            } else {
74                $from = $this->title;
75            }
76            $itemDate = new FeedDate($this->items[$i]->date);
77            $feed .= "From ".strtr(MBOXCreator::qp_enc($from), " ", "_")." ".date(
78                    "D M d H:i:s Y",
79                    $itemDate->unix()
80                )."\n";
81            $feed .= "Content-Type: text/plain;\n";
82            $feed .= "    charset=\"".$this->encoding."\"\n";
83            $feed .= "Content-Transfer-Encoding: quoted-printable\n";
84            $feed .= "Content-Type: text/plain\n";
85            $feed .= "From: \"".MBOXCreator::qp_enc($from)."\"\n";
86            $feed .= "Date: ".$itemDate->rfc822()."\n";
87            $feed .= "Subject: ".MBOXCreator::qp_enc(FeedCreator::iTrunc($this->items[$i]->title, 100))."\n";
88            $feed .= "\n";
89            $body = chunk_split(MBOXCreator::qp_enc($this->items[$i]->description));
90            $feed .= preg_replace("~\nFrom ([^\n]*)(\n?)~", "\n>From $1$2\n", $body);
91            $feed .= "\n";
92            $feed .= "\n";
93        }
94
95        return $feed;
96    }
97
98    /**
99     * Generate a filename for the feed cache file. Overridden from FeedCreator to prevent XML data types.
100     *
101     * @return string the feed cache filename
102     * @since  1.4
103     * @access private
104     */
105    protected function _generateFilename()
106    {
107        $fileInfo = pathinfo($_SERVER["PHP_SELF"]);
108
109        return substr($fileInfo["basename"], 0, -(strlen($fileInfo["extension"]) + 1)).".mbox";
110    }
111}
112