-
-
Notifications
You must be signed in to change notification settings - Fork 28
/
404-adaptive.php
205 lines (176 loc) · 6.34 KB
/
404-adaptive.php
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
<?php
/**
* Adaptive 404 response
*
* PHP version 5.4+
*
* @package Adaptive 404
* @version 0.1.2
* @license MIT
* @author Viktor Szépe <viktor@szepe.net>
* @link https://github.com/mathiasbynens/small
*/
/**
* Send adaptive response when content is not found.
*/
class Adaptive_404 {
/**
* HTML response body
*/
private $html = '';
/**
* Determine response type and send it.
*
* param string $custom_html Optional HTML reponse body
*
* @return void
*/
public function __construct( $custom_html = '' ) {
$this->set_html( $custom_html );
if ( '/robots.txt' === $_SERVER['REQUEST_URI'] ) {
$this->respond( "User-agent: *\nDisallow: /\n", 'text/plain' );
}
// Detect AJAX requests
if ( $this->is_ajax() ) {
$ext = 'AJAX';
} else {
// Find file extension in the request
$path = parse_url( $_SERVER['REQUEST_URI'], PHP_URL_PATH );
$ext = strtolower( pathinfo( $path, PATHINFO_EXTENSION ) );
}
// respond() exists so no break-s
switch ( $ext ) {
// AJAX & JSON
case 'AJAX':
case 'json':
$this->respond( '0', 'application/json' );
case 'jsonp':
// @TODO JSONP url?callback=function
$this->respond( '_([])', 'application/json' );
// XML & Feeds
case 'atom':
case 'rdf':
case 'rss':
case 'xml':
$this->respond( '<?xml version="1.1"?><!DOCTYPE _[<!ELEMENT _ EMPTY>]><_/>', 'application/xml' );
// Stylesheet
case 'css':
$this->respond( '', 'text/css' );
// Javascript
case 'js':
$this->respond( '', 'application/javascript' );
// Images
case 'jpg':
case 'jpeg':
case 'gif':
case 'png':
case 'ico':
case 'cur':
case 'webp':
case 'svg':
$this->respond( base64_decode( 'R0lGODlhAQABAIABAP///wAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==' ), 'image/gif' );
// Fonts
case 'ttf':
case 'ttc':
case 'otf':
case 'eot':
case 'woff':
case 'woff2':
$this->respond( gzdecode( base64_decode( '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' ) ), 'application/x-font-ttf' );
// Audio & Video
case 'mp3':
case 'mp4':
case 'ogg':
case 'wav':
case 'webm':
$this->respond( base64_decode( 'GkXfo0AgQoaBAUL3gQFC8oEEQvOBCEKCQAR3ZWJtQoeBAkKFgQIYU4BnQI0VSalmQCgq17FAAw9CQE2AQAZ3aGFtbXlXQUAGd2hhbW15RIlACECPQAAAAAAAFlSua0AxrkAu14EBY8WBAZyBACK1nEADdW5khkAFVl9WUDglhohAA1ZQOIOBAeBABrCBCLqBCB9DtnVAIueBAKNAHIEAAIAwAQCdASoIAAgAAUAmJaQAA3AA/vz0AAA=' ), 'video/webm' );
/*
// Plain text
case 'txt':
$this->respond( '404 - Not Found', 'text/plain' );
*/
// HTML
case 'html':
case 'htm':
case 'php':
$this->respond( $this->html );
// Could be a SEF URL
default:
if ( $this->accept_html() ) {
$this->respond( $this->html );
} else {
$this->respond( '404', 'text/plain' );
}
}
}
/**
* Is it an AJAX resuest?
*
* @return boolean
*/
private function is_ajax() {
return ! empty( $_SERVER['HTTP_X_REQUESTED_WITH'] )
&& 'xmlhttprequest' === strtolower( $_SERVER['HTTP_X_REQUESTED_WITH'] );
}
/**
* Does the client accept an HTML response?
*
* @return boolean
*/
private function accept_html() {
return ! empty( $_SERVER['HTTP_ACCEPT'] )
&& false !== stripos( $_SERVER['HTTP_ACCEPT'], 'text/html' );
}
/**
* Send the response to the client.
*
* param string $response_content Response body
* param string $content_type Response content type
*
* @return void
*/
private function respond( $response_content = '', $content_type = 'text/html; charset=UTF-8' ) {
// Flush output buffer
ob_get_level() && ob_end_clean();
if ( headers_sent() ) {
exit( '404' );
}
http_response_code( 404 );
$response_headers = array(
// 'Status' for proxy servers
'Status' => '404 Not Found',
// Stolen from WordPress core
'Expires' => 'Wed, 11 Jan 1984 05:00:00 GMT',
'Cache-Control' => 'no-cache, must-revalidate, max-age=0',
'Pragma' => 'no-cache',
'X-Robots-Tag' => 'noindex, nofollow',
'Content-Type' => $content_type,
);
foreach ( $response_headers as $name => $value ) {
header( sprintf( '%s: %s', $name, $value ), true );
}
exit( $response_content );
}
/**
* Set custom of default HTML reponse body.
*
* @param string $custom_html HTML reponse body
*
* @return void
*/
private function set_html( $custom_html ) {
// Apache's default 404 page
$default_html_tpl = '<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>404 Not Found</title>
</head><body>
<h1>Not Found</h1>
<p>The requested URL %s was not found on this server.</p>
</body></html>';
if ( empty( $custom_html ) ) {
$this->html = sprintf( $default_html_tpl, htmlspecialchars( urldecode( $_SERVER['REQUEST_URI'] ) ) );
} else {
$this->html = $custom_html;
}
}
}