02181fbe972eddafc01b8587556775dbc2c22649
[squirrelmail.git] / functions / url_parser.php
1 <?php
2
3 /**
4 * url_parser.php
5 *
6 * Copyright (c) 1999-2003 The SquirrelMail Project Team
7 * Licensed under the GNU GPL. For full terms see the file COPYING.
8 *
9 * This code provides various string manipulation functions that are
10 * used by the rest of the Squirrelmail code.
11 *
12 * $Id$
13 * @package squirrelmail
14 */
15
16 /**
17 * Undocumented - complain, then patch.
18 */
19 function replaceBlock (&$in, $replace, $start, $end) {
20 $begin = substr($in,0,$start);
21 $end = substr($in,$end,strlen($in)-$end);
22 $in = $begin.$replace.$end;
23 }
24
25 /* Having this defined in just one spot could help when changes need
26 * to be made to the pattern
27 * Make sure that the expression is evaluated case insensitively
28 *
29 * Here's pretty sophisticated IP matching:
30 * $IPMatch = '(2[0-5][0-9]|1?[0-9]{1,2})';
31 * $IPMatch = '\[?' . $IPMatch . '(\.' . $IPMatch . '){3}\]?';
32 */
33 /* Here's enough: */
34 global $IP_RegExp_Match, $Host_RegExp_Match, $Email_RegExp_Match;
35 $IP_RegExp_Match = '\\[?[0-9]{1,3}(\\.[0-9]{1,3}){3}\\]?';
36 $Host_RegExp_Match = '(' . $IP_RegExp_Match .
37 '|[0-9a-z]([-.]?[0-9a-z])*\\.[a-z][a-z]+)';
38 $Email_RegExp_Match = '[0-9a-z]([-_.+]?[0-9a-z])*(%' . $Host_RegExp_Match .
39 ')?@' . $Host_RegExp_Match;
40
41 function parseEmail (&$body) {
42 global $color, $Email_RegExp_Match;
43 $sbody = $body;
44 $addresses = array();
45
46 /* Find all the email addresses in the body */
47 while(eregi($Email_RegExp_Match, $sbody, $regs)) {
48 $addresses[$regs[0]] = $regs[0];
49 $start = strpos($sbody, $regs[0]) + strlen($regs[0]);
50 $sbody = substr($sbody, $start);
51 }
52 /* Replace each email address with a compose URL */
53 foreach ($addresses as $email) {
54 $comp_uri = makeComposeLink('src/compose.php?send_to='.urlencode($email), $email);
55 $body = str_replace($email, $comp_uri, $body);
56 }
57 /* Return number of unique addresses found */
58 return count($addresses);
59 }
60
61
62 /* We don't want to re-initialize this stuff for every line. Save work
63 * and just do it once here.
64 */
65 global $url_parser_url_tokens;
66 $url_parser_url_tokens = array(
67 'http://',
68 'https://',
69 'ftp://',
70 'telnet:', // Special case -- doesn't need the slashes
71 'gopher://',
72 'news://');
73
74 global $url_parser_poss_ends;
75 $url_parser_poss_ends = array(' ', "\n", "\r", '<', '>', ".\r", ".\n",
76 '.&nbsp;', '&nbsp;', ')', '(', '&quot;', '&lt;', '&gt;', '.<',
77 ']', '[', '{', '}', "\240", ', ', '. ', ",\n", ",\r");
78
79
80 function parseUrl (&$body) {
81 global $url_parser_poss_ends, $url_parser_url_tokens;;
82 $start = 0;
83 $blength = strlen($body);
84
85 while ($start != $blength) {
86 $target_token = '';
87 $target_pos = $blength;
88
89 /* Find the first token to replace */
90 foreach ($url_parser_url_tokens as $the_token) {
91 $pos = strpos(strtolower($body), $the_token, $start);
92 if (is_int($pos) && $pos < $blength) {
93 $target_pos = $pos;
94 $target_token = $the_token;
95 }
96 }
97
98 /* Look for email addresses between $start and $target_pos */
99 $check_str = substr($body, $start, $target_pos-$start);
100
101 if (parseEmail($check_str)) {
102 replaceBlock($body, $check_str, $start, $target_pos);
103 $blength = strlen($body);
104 $target_pos = strlen($check_str) + $start;
105 }
106
107 /* If there was a token to replace, replace it */
108 if ($target_token != '') {
109 /* Find the end of the URL */
110 $end = $blength;
111 foreach ($url_parser_poss_ends as $val) {
112 $enda = strpos($body, $val, $target_pos);
113 if (is_int($enda) && $enda < $end) {
114 $end = $enda;
115 }
116 }
117
118 /* Extract URL */
119 $url = substr($body, $target_pos, $end-$target_pos);
120
121 /* Needed since lines are not passed with \n or \r */
122 while ( ereg("[,\.]$", $url) ) {
123 $url = substr( $url, 0, -1 );
124 $end--;
125 }
126
127 /* Replace URL with HyperLinked Url, requires 1 char in link */
128 if ($url != '' && $url != $target_token) {
129 $url_str = "<a href=\"$url\" target=\"_blank\">$url</a>";
130 replaceBlock($body,$url_str,$target_pos,$end);
131 $target_pos += strlen($url_str);
132 }
133 else {
134 // Not quite a valid link, skip ahead to next chance
135 $target_pos += strlen($target_token);
136 }
137 }
138
139 /* Move forward */
140 $start = $target_pos;
141 $blength = strlen($body);
142 }
143 }
144 ?>