1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
<?php
/**
* Shaarli utilities
*/
/**
* Returns the small hash of a string, using RFC 4648 base64url format
*
* Small hashes:
* - are unique (well, as unique as crc32, at last)
* - are always 6 characters long.
* - only use the following characters: a-z A-Z 0-9 - _ @
* - are NOT cryptographically secure (they CAN be forged)
*
* In Shaarli, they are used as a tinyurl-like link to individual entries,
* e.g. smallHash('20111006_131924') --> yZH23w
*/
function smallHash($text)
{
$t = rtrim(base64_encode(hash('crc32', $text, true)), '=');
return strtr($t, '+/', '-_');
}
/**
* Tells if a string start with a substring
*/
function startsWith($haystack, $needle, $case=true)
{
if ($case) {
return (strcmp(substr($haystack, 0, strlen($needle)), $needle) === 0);
}
return (strcasecmp(substr($haystack, 0, strlen($needle)), $needle) === 0);
}
/**
* Tells if a string ends with a substring
*/
function endsWith($haystack, $needle, $case=true)
{
if ($case) {
return (strcmp(substr($haystack, strlen($haystack) - strlen($needle)), $needle) === 0);
}
return (strcasecmp(substr($haystack, strlen($haystack) - strlen($needle)), $needle) === 0);
}
/**
* Same as nl2br(), but escapes < and >
*/
function nl2br_escaped($html)
{
return str_replace('>', '>', str_replace('<', '<', nl2br($html)));
}
/**
* htmlspecialchars wrapper
*/
function escape($str)
{
return htmlspecialchars($str, ENT_COMPAT, 'UTF-8', false);
}
/**
* Link sanitization before templating
*/
function sanitizeLink(&$link)
{
$link['url'] = escape($link['url']); // useful?
$link['title'] = escape($link['title']);
$link['description'] = escape($link['description']);
$link['tags'] = escape($link['tags']);
}
/**
* Checks if a string represents a valid date
*
* @param string a string-formatted date
* @param format the expected DateTime format of the string
* @return whether the string is a valid date
* @see http://php.net/manual/en/class.datetime.php
* @see http://php.net/manual/en/datetime.createfromformat.php
*/
function checkDateFormat($format, $string)
{
$date = DateTime::createFromFormat($format, $string);
return $date && $date->format($string) == $string;
}
/**
* Generate a header location from HTTP_REFERER.
* Make sure the referer is Shaarli itself and prevent redirection loop.
*
* @param string $referer - HTTP_REFERER.
* @param string $host - Server HOST.
* @param array $loopTerms - Contains list of term to prevent redirection loop.
*
* @return string $referer - final referer.
*/
function generateLocation($referer, $host, $loopTerms = array())
{
$final_referer = '?';
// No referer if it contains any value in $loopCriteria.
foreach ($loopTerms as $value) {
if (strpos($referer, $value) !== false) {
return $final_referer;
}
}
// Remove port from HTTP_HOST
if ($pos = strpos($host, ':')) {
$host = substr($host, 0, $pos);
}
if (!empty($referer) && strpos(parse_url($referer, PHP_URL_HOST), $host) !== false) {
$final_referer = $referer;
}
return $final_referer;
}
/**
* Checks the PHP version to ensure Shaarli can run
*
* @param string $minVersion minimum PHP required version
* @param string $curVersion current PHP version (use PHP_VERSION)
*
* @throws Exception the PHP version is not supported
*/
function checkPHPVersion($minVersion, $curVersion)
{
if (version_compare($curVersion, $minVersion) < 0) {
throw new Exception(
'Your PHP version is obsolete!'
.' Shaarli requires at least PHP '.$minVersion.', and thus cannot run.'
.' Your PHP version has known security vulnerabilities and should be'
.' updated as soon as possible.'
);
}
}
?>
|
