Passed
Push — master ( c0a3a7...3b84a4 )
by Jeroen
58:51
created

engine/classes/ElggRewriteTester.php (1 issue)

1
<?php
2
3
use Elgg\Filesystem\Directory;
4
use Elgg\Application;
5
use Elgg\Project\Paths;
6
use Elgg\Http\Request;
7
8
/**
9
 * Elgg RewriteTester.
10
 * Test if URL rewriting is working.
11
 */
12
class ElggRewriteTester {
13
	protected $webserver;
14
	protected $serverSupportsRemoteRead;
15
	protected $rewriteTestPassed;
16
	protected $htaccessIssue;
17
18
	/**
19
	 * Set the webserver as unknown.
20
	 */
21
	public function __construct() {
22
		$this->webserver = 'unknown';
23
	}
24
25
	/**
26
	 * Run the rewrite test and return a status array
27
	 *
28
	 * @param string $url  URL of rewrite test
29
	 * @param string $path Root directory of Elgg with trailing slash
30
	 *
31
	 * @return array
32
	 */
33
	public function run($url, $path) {
34
35
		$this->webserver = \ElggRewriteTester::guessWebServer();
36
37
		$this->rewriteTestPassed = $this->runRewriteTest($url);
38
39
		if ($this->rewriteTestPassed == false) {
40
			if ($this->webserver == 'apache' || $this->webserver == 'unknown') {
41
				if ($this->createHtaccess($url, $path)) {
42
					$this->rewriteTestPassed = $this->runRewriteTest($url);
43
				}
44
			}
45
		}
46
47
		return $this->returnStatus($url);
48
	}
49
50
	/**
51
	 * Guess the web server from $_SERVER['SERVER_SOFTWARE']
52
	 *
53
	 * @return string
54
	 */
55
	public static function guessWebServer() {
56
		if (empty($_SERVER['SERVER_SOFTWARE'])) {
57
			return 'unknown';
58
		}
59
60
		$serverString = strtolower($_SERVER['SERVER_SOFTWARE']);
61
		$possibleServers = ['apache', 'nginx', 'lighttpd', 'iis'];
62
		foreach ($possibleServers as $server) {
63
			if (strpos($serverString, $server) !== false) {
64
				return $server;
65
			}
66
		}
67
		return 'unknown';
68
	}
69
70
	/**
71
	 * Guess if url contains subdirectory or not.
72
	 *
73
	 * @param string $url Rewrite test URL
74
	 *
75
	 * @return string|bool Subdirectory string with beginning and trailing slash or false if were unable to determine subdirectory
76
	 * or pointing at root of domain already
77
	 */
78
	public function guessSubdirectory($url) {
79
		$elements = parse_url($url);
80
		if (!$elements || !isset($elements['path'])) {
81
			return false;
82
		}
83
		$subdir = trim(dirname($elements['path']), '/');
84
		if (!$subdir) {
85
			return false;
86
		} else {
87
			return "/$subdir/";
88
		}
89
	}
90
91
	/**
92
	 * Hit the rewrite test URL to determine if the rewrite rules are working
93
	 *
94
	 * @param string $url Rewrite test URL
95
	 *
96
	 * @return bool
97
	 */
98
	public function runRewriteTest($url) {
99
		$this->serverSupportsRemoteRead = ($this->fetchUrl($url) === Request::REWRITE_TEST_OUTPUT);
100
		return $this->serverSupportsRemoteRead;
101
	}
102
	
103
	/**
104
	 * Check whether the site homepage can be fetched via curl
105
	 *
106
	 * @return boolean
107
	 */
108
	public function runLocalhostAccessTest() {
109
		$url = _elgg_config()->wwwroot;
110
		return (bool) $this->fetchUrl($url);
111
	}
112
113
	/**
114
	 * Fetch a URL
115
	 *
116
	 * @param string $url The URL
117
	 *
118
	 * @return string Note that empty string may imply failure in fetching or empty response
119
	 */
120
	private function fetchUrl($url) {
121
		$response = '';
122
123
		if (ini_get('allow_url_fopen')) {
124
			$ctx = stream_context_create([
125
				'http' => [
126
					'follow_location' => 0,
127
					'timeout' => 5,
128
				],
129
			]);
130
			$response = @file_get_contents($url, null, $ctx);
131
		}
132
133
		if (!$response && function_exists('curl_init')) {
134
			$ch = curl_init();
135
			curl_setopt($ch, CURLOPT_URL, $url);
136
			curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
137
			curl_setopt($ch, CURLOPT_TIMEOUT, 5);
138
			curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
139
			$response = curl_exec($ch);
140
			curl_close($ch);
141
		}
142
143
		return (string) $response;
144
	}
145
146
	/**
147
	 * Create Elgg's .htaccess file or confirm that it exists
148
	 *
149
	 * @param string $url URL of rewrite test
150
	 *
151
	 * @return bool
152
	 */
153
	public function createHtaccess($url) {
154
		$root = Directory\Local::projectRoot();
155
		$file = $root->getFile(".htaccess");
156
157
		if ($file->exists()) {
158
			// check that this is the Elgg .htaccess
159
			$data = $file->getContents();
160
			if ($data === false) {
161
				// don't have permission to read the file
162
				$this->htaccessIssue = 'read_permission';
163
				return false;
164
			}
165
166
			if (strpos($data, 'Elgg') === false) {
167
				$this->htaccessIssue = 'non_elgg_htaccess';
168
				return false;
169
			}
170
171
			// check if this is an old Elgg htaccess
172
			if (strpos($data, 'RewriteRule ^rewrite.php$ install.php') == false) {
0 ignored issues
show
Bug Best Practice introduced by
It seems like you are loosely comparing strpos($data, 'RewriteRu...rite.php$ install.php') of type integer to the boolean false. If you are specifically checking for 0, consider using something more explicit like === 0 instead.
Loading history...
173
				$this->htaccessIssue = 'old_elgg_htaccess';
174
				return false;
175
			}
176
			return true;
177
		}
178
179
		if (!is_writable($root->getPath())) {
180
			$this->htaccessIssue = 'write_permission';
181
			return false;
182
		}
183
184
		// create the .htaccess file
185
		$result = copy(Paths::elgg() . "install/config/htaccess.dist", $file->getPath());
186
		if (!$result) {
187
			$this->htaccessIssue = 'cannot_copy';
188
			return false;
189
		}
190
		
191
		// does default RewriteBase work already?
192
		if (!$this->runRewriteTest($url)) {
193
			//try to rewrite to guessed subdirectory
194
			if ($subdir = $this->guessSubdirectory($url)) {
195
				$contents = $file->getContents();
196
				$contents = preg_replace("/#RewriteBase \/(\r?\n)/", "RewriteBase $subdir\$1", $contents);
197
				if ($contents) {
198
					$file->putContents($contents);
199
				}
200
			}
201
		}
202
203
		return true;
204
	}
205
206
	/**
207
	 * Create the status array required by the ElggInstaller
208
	 *
209
	 * @param string $url Rewrite test URL
210
	 *
211
	 * @return array
212
	 */
213
	protected function returnStatus($url) {
214
		if ($this->rewriteTestPassed) {
215
			return [
216
				'severity' => 'pass',
217
				'message' => _elgg_services()->translator->translate('install:check:rewrite:success'),
218
			];
219
		}
220
221
		if ($this->serverSupportsRemoteRead == false) {
222
			$msg = _elgg_services()->translator->translate('install:warning:rewrite:unknown', [$url]);
223
			$msg .= elgg_view('install/js_rewrite_check', ['url' => $url]);
224
			
225
			return [
226
				'severity' => 'warning',
227
				'message' => $msg,
228
			];
229
		}
230
231
		if ($this->webserver == 'apache') {
232
			$serverString = _elgg_services()->translator->translate('install:error:rewrite:apache');
233
			$msg = "$serverString\n\n";
234
			if (!isset($this->htaccessIssue)) {
235
				$msg .= _elgg_services()->translator->translate('install:error:rewrite:allowoverride');
236
				$msg .= elgg_view('install/js_rewrite_check', ['url' => $url]);
237
			
238
				return [
239
					'severity' => 'warning',
240
					'message' => $msg,
241
				];
242
			}
243
			$msg .= _elgg_services()->translator->translate("install:error:rewrite:htaccess:{$this->htaccessIssue}");
244
			return [
245
				'severity' => 'warning',
246
				'message' => $msg,
247
			];
248
		}
249
250
		if ($this->webserver != 'unknown') {
251
			$serverString = _elgg_services()->translator->translate("install:error:rewrite:{$this->webserver}");
252
			$msg = "$serverString\n\n";
253
			$msg .= _elgg_services()->translator->translate("install:error:rewrite:altserver");
254
			return [
255
				'severity' => 'warning',
256
				'message' => $msg,
257
			];
258
		}
259
260
		return [
261
			'severity' => 'warning',
262
			'message' => _elgg_services()->translator->translate('install:error:rewrite:unknown'),
263
		];
264
	}
265
}
266