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
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
<?php
/**
* GET an HTTP URL to retrieve its content
*
* @param string $url URL to get (http://...)
* @param int $timeout network timeout (in seconds)
* @param int $maxBytes maximum downloaded bytes (default: 4 MiB)
*
* @return array HTTP response headers, downloaded content
*
* Output format:
* [0] = associative array containing HTTP response headers
* [1] = URL content (downloaded data)
*
* Example:
* list($headers, $data) = get_http_response('http://sebauvage.net/');
* if (strpos($headers[0], '200 OK') !== false) {
* echo 'Data type: '.htmlspecialchars($headers['Content-Type']);
* } else {
* echo 'There was an error: '.htmlspecialchars($headers[0]);
* }
*
* @see http://php.net/manual/en/function.file-get-contents.php
* @see http://php.net/manual/en/function.stream-context-create.php
* @see http://php.net/manual/en/function.get-headers.php
*/
function get_http_response($url, $timeout = 30, $maxBytes = 4194304)
{
$urlObj = new Url($url);
$cleanUrl = $urlObj->idnToAscii();
if (! filter_var($cleanUrl, FILTER_VALIDATE_URL) || ! $urlObj->isHttp()) {
return array(array(0 => 'Invalid HTTP Url'), false);
}
$options = array(
'http' => array(
'method' => 'GET',
'timeout' => $timeout,
'user_agent' => 'Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:45.0)'
.' Gecko/20100101 Firefox/45.0',
'accept_language' => substr(setlocale(LC_COLLATE, 0), 0, 2) . ',en-US;q=0.7,en;q=0.3',
)
);
stream_context_set_default($options);
list($headers, $finalUrl) = get_redirected_headers($cleanUrl);
if (! $headers || strpos($headers[0], '200 OK') === false) {
$options['http']['request_fulluri'] = true;
stream_context_set_default($options);
list($headers, $finalUrl) = get_redirected_headers($cleanUrl);
}
if (! $headers || strpos($headers[0], '200 OK') === false) {
return array($headers, false);
}
try {
// TODO: catch Exception in calling code (thumbnailer)
$context = stream_context_create($options);
$content = file_get_contents($finalUrl, false, $context, -1, $maxBytes);
} catch (Exception $exc) {
return array(array(0 => 'HTTP Error'), $exc->getMessage());
}
return array($headers, $content);
}
/**
* Retrieve HTTP headers, following n redirections (temporary and permanent ones).
*
* @param string $url initial URL to reach.
* @param int $redirectionLimit max redirection follow.
*
* @return array HTTP headers, or false if it failed.
*/
function get_redirected_headers($url, $redirectionLimit = 3)
{
$headers = get_headers($url, 1);
if (!empty($headers['location']) && empty($headers['Location'])) {
$headers['Location'] = $headers['location'];
}
// Headers found, redirection found, and limit not reached.
if ($redirectionLimit-- > 0
&& !empty($headers)
&& (strpos($headers[0], '301') !== false || strpos($headers[0], '302') !== false)
&& !empty($headers['Location'])) {
$redirection = is_array($headers['Location']) ? end($headers['Location']) : $headers['Location'];
if ($redirection != $url) {
$redirection = getAbsoluteUrl($url, $redirection);
return get_redirected_headers($redirection, $redirectionLimit);
}
}
return array($headers, $url);
}
/**
* Get an absolute URL from a complete one, and another absolute/relative URL.
*
* @param string $originalUrl The original complete URL.
* @param string $newUrl The new one, absolute or relative.
*
* @return string Final URL:
* - $newUrl if it was already an absolute URL.
* - if it was relative, absolute URL from $originalUrl path.
*/
function getAbsoluteUrl($originalUrl, $newUrl)
{
$newScheme = parse_url($newUrl, PHP_URL_SCHEME);
// Already an absolute URL.
if (!empty($newScheme)) {
return $newUrl;
}
$parts = parse_url($originalUrl);
$final = $parts['scheme'] .'://'. $parts['host'];
$final .= (!empty($parts['port'])) ? $parts['port'] : '';
$final .= '/';
if ($newUrl[0] != '/') {
$final .= substr(ltrim($parts['path'], '/'), 0, strrpos($parts['path'], '/'));
}
$final .= ltrim($newUrl, '/');
return $final;
}
/**
* Returns the server's base URL: scheme://domain.tld[:port]
*
* @param array $server the $_SERVER array
*
* @return string the server's base URL
*
* @see http://www.ietf.org/rfc/rfc7239.txt
* @see http://www.ietf.org/rfc/rfc6648.txt
* @see http://stackoverflow.com/a/3561399
* @see http://stackoverflow.com/q/452375
*/
function server_url($server)
{
$scheme = 'http';
$port = '';
// Shaarli is served behind a proxy
if (isset($server['HTTP_X_FORWARDED_PROTO'])) {
// Keep forwarded scheme
if (strpos($server['HTTP_X_FORWARDED_PROTO'], ',') !== false) {
$schemes = explode(',', $server['HTTP_X_FORWARDED_PROTO']);
$scheme = trim($schemes[0]);
} else {
$scheme = $server['HTTP_X_FORWARDED_PROTO'];
}
if (isset($server['HTTP_X_FORWARDED_PORT'])) {
// Keep forwarded port
if (strpos($server['HTTP_X_FORWARDED_PORT'], ',') !== false) {
$ports = explode(',', $server['HTTP_X_FORWARDED_PORT']);
$port = ':' . trim($ports[0]);
} else {
$port = ':' . $server['HTTP_X_FORWARDED_PORT'];
}
}
return $scheme.'://'.$server['SERVER_NAME'].$port;
}
// SSL detection
if ((! empty($server['HTTPS']) && strtolower($server['HTTPS']) == 'on')
|| (isset($server['SERVER_PORT']) && $server['SERVER_PORT'] == '443')) {
$scheme = 'https';
}
// Do not append standard port values
if (($scheme == 'http' && $server['SERVER_PORT'] != '80')
|| ($scheme == 'https' && $server['SERVER_PORT'] != '443')) {
$port = ':'.$server['SERVER_PORT'];
}
return $scheme.'://'.$server['SERVER_NAME'].$port;
}
/**
* Returns the absolute URL of the current script, without the query
*
* If the resource is "index.php", then it is removed (for better-looking URLs)
*
* @param array $server the $_SERVER array
*
* @return string the absolute URL of the current script, without the query
*/
function index_url($server)
{
$scriptname = $server['SCRIPT_NAME'];
if (endsWith($scriptname, 'index.php')) {
$scriptname = substr($scriptname, 0, -9);
}
return server_url($server) . $scriptname;
}
/**
* Returns the absolute URL of the current script, with the query
*
* If the resource is "index.php", then it is removed (for better-looking URLs)
*
* @param array $server the $_SERVER array
*
* @return string the absolute URL of the current script, with the query
*/
function page_url($server)
{
if (! empty($server['QUERY_STRING'])) {
return index_url($server).'?'.$server['QUERY_STRING'];
}
return index_url($server);
}
|
