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Commit | Line | Data |
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ca74886f V |
1 | <?php |
2 | /** | |
3 | * Shaarli utilities | |
4 | */ | |
5 | ||
1abe6555 V |
6 | /** |
7 | * Logs a message to a text file | |
8 | * | |
9 | * @param string $logFile where to write the logs | |
10 | * @param string $clientIp the client's remote IPv4/IPv6 address | |
11 | * @param string $message the message to log | |
12 | */ | |
13 | function logm($logFile, $clientIp, $message) | |
14 | { | |
15 | $line = strval(date('Y/m/d_H:i:s')).' - '.$clientIp.' - '.strval($message).'\n'; | |
16 | file_put_contents($logFile, $line, FILE_APPEND); | |
17 | } | |
18 | ||
ca74886f V |
19 | /** |
20 | * Returns the small hash of a string, using RFC 4648 base64url format | |
21 | * | |
22 | * Small hashes: | |
23 | * - are unique (well, as unique as crc32, at last) | |
24 | * - are always 6 characters long. | |
25 | * - only use the following characters: a-z A-Z 0-9 - _ @ | |
26 | * - are NOT cryptographically secure (they CAN be forged) | |
27 | * | |
28 | * In Shaarli, they are used as a tinyurl-like link to individual entries, | |
29 | * e.g. smallHash('20111006_131924') --> yZH23w | |
30 | */ | |
31 | function smallHash($text) | |
32 | { | |
33 | $t = rtrim(base64_encode(hash('crc32', $text, true)), '='); | |
34 | return strtr($t, '+/', '-_'); | |
35 | } | |
36 | ||
37 | /** | |
38 | * Tells if a string start with a substring | |
39 | */ | |
40 | function startsWith($haystack, $needle, $case=true) | |
41 | { | |
42 | if ($case) { | |
43 | return (strcmp(substr($haystack, 0, strlen($needle)), $needle) === 0); | |
44 | } | |
45 | return (strcasecmp(substr($haystack, 0, strlen($needle)), $needle) === 0); | |
46 | } | |
47 | ||
48 | /** | |
49 | * Tells if a string ends with a substring | |
50 | */ | |
51 | function endsWith($haystack, $needle, $case=true) | |
52 | { | |
53 | if ($case) { | |
54 | return (strcmp(substr($haystack, strlen($haystack) - strlen($needle)), $needle) === 0); | |
55 | } | |
56 | return (strcasecmp(substr($haystack, strlen($haystack) - strlen($needle)), $needle) === 0); | |
57 | } | |
64bc92e3 | 58 | |
59 | /** | |
60 | * Same as nl2br(), but escapes < and > | |
61 | */ | |
62 | function nl2br_escaped($html) | |
63 | { | |
d1e2f8e5 | 64 | return str_replace('>', '>', str_replace('<', '<', nl2br($html))); |
64bc92e3 | 65 | } |
66 | ||
67 | /** | |
68 | * htmlspecialchars wrapper | |
69 | */ | |
70 | function escape($str) | |
71 | { | |
72 | return htmlspecialchars($str, ENT_COMPAT, 'UTF-8', false); | |
73 | } | |
74 | ||
75 | /** | |
76 | * Link sanitization before templating | |
77 | */ | |
78 | function sanitizeLink(&$link) | |
79 | { | |
80 | $link['url'] = escape($link['url']); // useful? | |
81 | $link['title'] = escape($link['title']); | |
82 | $link['description'] = escape($link['description']); | |
83 | $link['tags'] = escape($link['tags']); | |
84 | } | |
9186ab95 V |
85 | |
86 | /** | |
87 | * Checks if a string represents a valid date | |
822bffce A |
88 | |
89 | * @param string $format The expected DateTime format of the string | |
90 | * @param string $string A string-formatted date | |
91 | * | |
92 | * @return bool whether the string is a valid date | |
9186ab95 | 93 | * |
822bffce A |
94 | * @see http://php.net/manual/en/class.datetime.php |
95 | * @see http://php.net/manual/en/datetime.createfromformat.php | |
9186ab95 V |
96 | */ |
97 | function checkDateFormat($format, $string) | |
98 | { | |
99 | $date = DateTime::createFromFormat($format, $string); | |
100 | return $date && $date->format($string) == $string; | |
101 | } | |
775803a0 A |
102 | |
103 | /** | |
104 | * Generate a header location from HTTP_REFERER. | |
105 | * Make sure the referer is Shaarli itself and prevent redirection loop. | |
106 | * | |
107 | * @param string $referer - HTTP_REFERER. | |
108 | * @param string $host - Server HOST. | |
109 | * @param array $loopTerms - Contains list of term to prevent redirection loop. | |
110 | * | |
111 | * @return string $referer - final referer. | |
112 | */ | |
113 | function generateLocation($referer, $host, $loopTerms = array()) | |
114 | { | |
d01c2342 | 115 | $finalReferer = '?'; |
775803a0 A |
116 | |
117 | // No referer if it contains any value in $loopCriteria. | |
118 | foreach ($loopTerms as $value) { | |
119 | if (strpos($referer, $value) !== false) { | |
d01c2342 | 120 | return $finalReferer; |
775803a0 A |
121 | } |
122 | } | |
123 | ||
124 | // Remove port from HTTP_HOST | |
125 | if ($pos = strpos($host, ':')) { | |
126 | $host = substr($host, 0, $pos); | |
127 | } | |
128 | ||
d01c2342 A |
129 | $refererHost = parse_url($referer, PHP_URL_HOST); |
130 | if (!empty($referer) && (strpos($refererHost, $host) !== false || startsWith('?', $refererHost))) { | |
131 | $finalReferer = $referer; | |
775803a0 A |
132 | } |
133 | ||
d01c2342 | 134 | return $finalReferer; |
775803a0 | 135 | } |
d1e2f8e5 | 136 | |
06b6660a A |
137 | /** |
138 | * Validate session ID to prevent Full Path Disclosure. | |
68bc2135 | 139 | * |
06b6660a | 140 | * See #298. |
68bc2135 | 141 | * The session ID's format depends on the hash algorithm set in PHP settings |
06b6660a A |
142 | * |
143 | * @param string $sessionId Session ID | |
144 | * | |
145 | * @return true if valid, false otherwise. | |
68bc2135 V |
146 | * |
147 | * @see http://php.net/manual/en/function.hash-algos.php | |
148 | * @see http://php.net/manual/en/session.configuration.php | |
06b6660a A |
149 | */ |
150 | function is_session_id_valid($sessionId) | |
151 | { | |
152 | if (empty($sessionId)) { | |
153 | return false; | |
154 | } | |
155 | ||
156 | if (!$sessionId) { | |
157 | return false; | |
158 | } | |
159 | ||
68bc2135 | 160 | if (!preg_match('/^[a-zA-Z0-9,-]{2,128}$/', $sessionId)) { |
06b6660a A |
161 | return false; |
162 | } | |
163 | ||
164 | return true; | |
165 | } | |
90e5bd65 A |
166 | |
167 | /** | |
168 | * In a string, converts URLs to clickable links. | |
169 | * | |
170 | * @param string $text input string. | |
171 | * @param string $redirector if a redirector is set, use it to gerenate links. | |
172 | * | |
173 | * @return string returns $text with all links converted to HTML links. | |
174 | * | |
175 | * @see Function inspired from http://www.php.net/manual/en/function.preg-replace.php#85722 | |
176 | */ | |
177 | function text2clickable($text, $redirector) | |
178 | { | |
179 | $regex = '!(((?:https?|ftp|file)://|apt:|magnet:)\S+[[:alnum:]]/?)!si'; | |
180 | ||
181 | if (empty($redirector)) { | |
182 | return preg_replace($regex, '<a href="$1">$1</a>', $text); | |
183 | } | |
184 | // Redirector is set, urlencode the final URL. | |
185 | return preg_replace_callback( | |
186 | $regex, | |
187 | function ($matches) use ($redirector) { | |
188 | return '<a href="' . $redirector . urlencode($matches[1]) .'">'. $matches[1] .'</a>'; | |
189 | }, | |
190 | $text | |
191 | ); | |
192 | } | |
193 | ||
194 | /** | |
195 | * This function inserts where relevant so that multiple spaces are properly displayed in HTML | |
196 | * even in the absence of <pre> (This is used in description to keep text formatting). | |
197 | * | |
198 | * @param string $text input text. | |
199 | * | |
200 | * @return string formatted text. | |
201 | */ | |
202 | function space2nbsp($text) | |
203 | { | |
204 | return preg_replace('/(^| ) /m', '$1 ', $text); | |
205 | } | |
206 | ||
207 | /** | |
208 | * Format Shaarli's description | |
209 | * TODO: Move me to ApplicationUtils when it's ready. | |
210 | * | |
211 | * @param string $description shaare's description. | |
212 | * @param string $redirector if a redirector is set, use it to gerenate links. | |
213 | * | |
214 | * @return string formatted description. | |
215 | */ | |
216 | function format_description($description, $redirector) { | |
217 | return nl2br(space2nbsp(text2clickable($description, $redirector))); | |
218 | } |