MediaWiki REL1_33
LinkFilterTest.php
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1<?php
2
3use Wikimedia\Rdbms\LikeMatch;
4
9class LinkFilterTest extends MediaWikiLangTestCase {
10
11 protected function setUp() {
12 parent::setUp();
13
14 $this->setMwGlobals( 'wgUrlProtocols', [
15 'http://',
16 'https://',
17 'ftp://',
18 'irc://',
19 'ircs://',
20 'gopher://',
21 'telnet://',
22 'nntp://',
23 'worldwind://',
24 'mailto:',
25 'news:',
26 'svn://',
27 'git://',
28 'mms://',
29 '//',
30 ] );
31 }
32
41 function createRegexFromLIKE( $like ) {
42 $regex = '!^';
43
44 foreach ( $like as $item ) {
45 if ( $item instanceof LikeMatch ) {
46 if ( $item->toString() == '%' ) {
47 $regex .= '.*';
48 } elseif ( $item->toString() == '_' ) {
49 $regex .= '.';
50 }
51 } else {
52 $regex .= preg_quote( $item, '!' );
53 }
54
55 }
56
57 $regex .= '$!';
58
59 return $regex;
60 }
61
67 public static function provideValidPatterns() {
68 return [
69 // Protocol, Search pattern, URL which matches the pattern
70 [ 'http://', '*.test.com', 'http://www.test.com' ],
71 [ 'http://', 'test.com:8080/dir/file', 'http://name:pass@test.com:8080/dir/file' ],
72 [ 'https://', '*.com', 'https://s.s.test..com:88/dir/file?a=1&b=2' ],
73 [ 'https://', '*.com', 'https://name:pass@secure.com/index.html' ],
74 [ 'http://', 'name:pass@test.com', 'http://test.com' ],
75 [ 'http://', 'test.com', 'http://name:pass@test.com' ],
76 [ 'http://', '*.test.com', 'http://a.b.c.test.com/dir/dir/file?a=6' ],
77 [ null, 'http://*.test.com', 'http://www.test.com' ],
78 [ 'http://', '.test.com', 'http://.test.com' ],
79 [ 'http://', '*..test.com', 'http://foo..test.com' ],
80 [ 'mailto:', 'name@mail.test123.com', 'mailto:name@mail.test123.com' ],
81 [ 'mailto:', '*@mail.test123.com', 'mailto:name@mail.test123.com' ],
82 [ '',
83 'http://name:pass@www.test.com:12345/dir/dir/file.xyz.php#__se__?arg1=_&arg2[]=4rtg',
84 'http://name:pass@www.test.com:12345/dir/dir/file.xyz.php#__se__?arg1=_&arg2[]=4rtg'
85 ],
86 [ '', 'http://name:pass@*.test.com:12345/dir/dir/file.xyz.php#__se__?arg1=_&arg2[]=4rtg',
87 'http://name:pass@www.test.com:12345/dir/dir/file.xyz.php#__se__?arg1=_&arg2[]=4rtg' ],
88 [ '', 'http://name:wrongpass@*.com:12345/dir/dir/file.xyz.php#__se__?arg1=_&arg2[]',
89 'http://name:pass@www.test.com:12345/dir/dir/file.xyz.php#__se__?arg1=_&arg2[]=4rtg' ],
90 [ 'http://', 'name:pass@*.test.com:12345/dir/dir/file.xyz.php#__se__?arg1=_&arg2[]=4rtg',
91 'http://name:pass@www.test.com:12345/dir/dir/file.xyz.php#__se__?arg1=_&arg2[]=4rtg' ],
92 [ '', 'http://name:pass@www.test.com:12345',
93 'http://name:pass@www.test.com:12345/dir/dir/file.xyz.php#__se__?arg1=_&arg2[]=4rtg' ],
94 [ 'ftp://', 'user:pass@ftp.test.com:1233/home/user/file;type=efw',
95 'ftp://user:pass@ftp.test.com:1233/home/user/file;type=efw' ],
96 [ null, 'ftp://otheruser:otherpass@ftp.test.com:1233/home/user/file;type=',
97 'ftp://user:pass@ftp.test.com:1233/home/user/file;type=efw' ],
98 [ null, 'ftp://@ftp.test.com:1233/home/user/file;type=',
99 'ftp://user:pass@ftp.test.com:1233/home/user/file;type=efw' ],
100 [ null, 'ftp://ftp.test.com/',
101 'ftp://user:pass@ftp.test.com/home/user/file;type=efw' ],
102 [ null, 'ftp://ftp.test.com/',
103 'ftp://user:pass@ftp.test.com/home/user/file;type=efw' ],
104 [ null, 'ftp://*.test.com:222/',
105 'ftp://user:pass@ftp.test.com:222/home' ],
106 [ 'irc://', '*.myserver:6667/', 'irc://test.myserver:6667/' ],
107 [ 'irc://', 'name:pass@*.myserver/', 'irc://test.myserver:6667/' ],
108 [ 'irc://', 'name:pass@*.myserver/', 'irc://other:@test.myserver:6667/' ],
109 [ '', 'irc://test/name,string,abc?msg=t', 'irc://test/name,string,abc?msg=test' ],
110 [ '', 'https://gerrit.wikimedia.org/r/#/q/status:open,n,z',
111 'https://gerrit.wikimedia.org/r/#/q/status:open,n,z' ],
112 [ '', 'https://gerrit.wikimedia.org',
113 'https://gerrit.wikimedia.org/r/#/q/status:open,n,z' ],
114 [ 'mailto:', '*.test.com', 'mailto:name@pop3.test.com' ],
115 [ 'mailto:', 'test.com', 'mailto:name@test.com' ],
116 [ 'news:', 'test.1234afc@news.test.com', 'news:test.1234afc@news.test.com' ],
117 [ 'news:', '*.test.com', 'news:test.1234afc@news.test.com' ],
118 [ '', 'news:4df8kh$iagfewewf(at)newsbf02aaa.news.aol.com',
119 'news:4df8kh$iagfewewf(at)newsbf02aaa.news.aol.com' ],
120 [ '', 'news:*.aol.com',
121 'news:4df8kh$iagfewewf(at)newsbf02aaa.news.aol.com' ],
122 [ '', 'git://github.com/prwef/abc-def.git', 'git://github.com/prwef/abc-def.git' ],
123 [ 'git://', 'github.com/', 'git://github.com/prwef/abc-def.git' ],
124 [ 'git://', '*.github.com/', 'git://a.b.c.d.e.f.github.com/prwef/abc-def.git' ],
125 [ '', 'gopher://*.test.com/', 'gopher://gopher.test.com/0/v2/vstat' ],
126 [ 'telnet://', '*.test.com', 'telnet://shell.test.com/~home/' ],
127 [ '', 'http://test.com', 'http://test.com/index?arg=1' ],
128 [ 'http://', '*.test.com', 'http://www.test.com/index?arg=1' ],
129 [ '' ,
130 'http://xx23124:__ffdfdef__@www.test.com:12345/dir' ,
131 'http://name:pass@www.test.com:12345/dir/dir/file.xyz.php#__se__?arg1=_&arg2[]=4rtg'
132 ],
133 [ 'http://', '127.0.0.1', 'http://127.000.000.001' ],
134 [ 'http://', '127.0.0.*', 'http://127.000.000.010' ],
135 [ 'http://', '127.0.*', 'http://127.000.123.010' ],
136 [ 'http://', '127.*', 'http://127.127.127.127' ],
137 [ 'http://', '[0:0:0:0:0:0:0:0001]', 'http://[::1]' ],
138 [ 'http://', '[2001:db8:0:0:*]', 'http://[2001:0DB8::]' ],
139 [ 'http://', '[2001:db8:0:0:*]', 'http://[2001:0DB8::123]' ],
140 [ 'http://', '[2001:db8:0:0:*]', 'http://[2001:0DB8::123:456]' ],
141 [ 'http://', 'xn--f-vgaa.example.com', 'http://fóó.example.com', [ 'idn' => true ] ],
142 [ 'http://', 'xn--f-vgaa.example.com', 'http://f%c3%b3%C3%B3.example.com', [ 'idn' => true ] ],
143 [ 'http://', 'fóó.example.com', 'http://xn--f-vgaa.example.com', [ 'idn' => true ] ],
144 [ 'http://', 'f%c3%b3%C3%B3.example.com', 'http://xn--f-vgaa.example.com', [ 'idn' => true ] ],
145 [ 'http://', 'f%c3%b3%C3%B3.example.com', 'http://fóó.example.com' ],
146 [ 'http://', 'fóó.example.com', 'http://f%c3%b3%C3%B3.example.com' ],
147
148 [ 'http://', 'example.com./foo', 'http://example.com/foo' ],
149 [ 'http://', 'example.com/foo', 'http://example.com./foo' ],
150 [ 'http://', '127.0.0.1./foo', 'http://127.0.0.1/foo' ],
151 [ 'http://', '127.0.0.1/foo', 'http://127.0.0.1./foo' ],
152
153 // Tests for false positives
154 [ 'http://', 'test.com', 'http://www.test.com', [ 'found' => false ] ],
155 [ 'http://', 'www1.test.com', 'http://www.test.com', [ 'found' => false ] ],
156 [ 'http://', '*.test.com', 'http://www.test.t.com', [ 'found' => false ] ],
157 [ 'http://', 'test.com', 'http://xtest.com', [ 'found' => false ] ],
158 [ 'http://', '*.test.com', 'http://xtest.com', [ 'found' => false ] ],
159 [ 'http://', '.test.com', 'http://test.com', [ 'found' => false ] ],
160 [ 'http://', '.test.com', 'http://www.test.com', [ 'found' => false ] ],
161 [ 'http://', '*..test.com', 'http://test.com', [ 'found' => false ] ],
162 [ 'http://', '*..test.com', 'http://www.test.com', [ 'found' => false ] ],
163 [ '', 'http://test.com:8080', 'http://www.test.com:8080', [ 'found' => false ] ],
164 [ '', 'https://test.com', 'http://test.com', [ 'found' => false ] ],
165 [ '', 'http://test.com', 'https://test.com', [ 'found' => false ] ],
166 [ 'http://', 'http://test.com', 'http://test.com', [ 'found' => false ] ],
167 [ null, 'http://www.test.com', 'http://www.test.com:80', [ 'found' => false ] ],
168 [ null, 'http://www.test.com:80', 'http://www.test.com', [ 'found' => false ] ],
169 [ null, 'http://*.test.com:80', 'http://www.test.com', [ 'found' => false ] ],
170 [ '', 'https://gerrit.wikimedia.org/r/#/XXX/status:open,n,z',
171 'https://gerrit.wikimedia.org/r/#/q/status:open,n,z', [ 'found' => false ] ],
172 [ '', 'https://*.wikimedia.org/r/#/q/status:open,n,z',
173 'https://gerrit.wikimedia.org/r/#/XXX/status:open,n,z', [ 'found' => false ] ],
174 [ 'mailto:', '@test.com', '@abc.test.com', [ 'found' => false ] ],
175 [ 'mailto:', 'mail@test.com', 'mail2@test.com', [ 'found' => false ] ],
176 [ '', 'mailto:mail@test.com', 'mail2@test.com', [ 'found' => false ] ],
177 [ '', 'mailto:@test.com', '@abc.test.com', [ 'found' => false ] ],
178 [ 'ftp://', '*.co', 'ftp://www.co.uk', [ 'found' => false ] ],
179 [ 'ftp://', '*.co', 'ftp://www.co.m', [ 'found' => false ] ],
180 [ 'ftp://', '*.co/dir/', 'ftp://www.co/dir2/', [ 'found' => false ] ],
181 [ 'ftp://', 'www.co/dir/', 'ftp://www.co/dir2/', [ 'found' => false ] ],
182 [ 'ftp://', 'test.com/dir/', 'ftp://test.com/', [ 'found' => false ] ],
183 [ '', 'http://test.com:8080/dir/', 'http://test.com:808/dir/', [ 'found' => false ] ],
184 [ '', 'http://test.com/dir/index.html', 'http://test.com/dir/index.php', [ 'found' => false ] ],
185 [ 'http://', '127.0.0.*', 'http://127.0.1.0', [ 'found' => false ] ],
186 [ 'http://', '[2001:db8::*]', 'http://[2001:0DB8::123:456]', [ 'found' => false ] ],
187
188 // These are false positives too and ideally shouldn't match, but that
189 // would require using regexes and RLIKE instead of LIKE
190 // [ null, 'http://*.test.com', 'http://www.test.com:80', [ 'found' => false ] ],
191 // [ '', 'https://*.wikimedia.org/r/#/q/status:open,n,z',
192 // 'https://gerrit.wikimedia.org/XXX/r/#/q/status:open,n,z', [ 'found' => false ] ],
193 ];
194 }
195
211 function testMakeLikeArrayWithValidPatterns( $protocol, $pattern, $url, $options = [] ) {
212 $options += [ 'found' => true, 'idn' => false ];
213 if ( !empty( $options['idn'] ) && !LinkFilter::supportsIDN() ) {
214 $this->markTestSkipped( 'LinkFilter IDN support is not available' );
215 }
216
217 $indexes = LinkFilter::makeIndexes( $url );
218 $likeArray = LinkFilter::makeLikeArray( $pattern, $protocol );
219
220 $this->assertTrue( $likeArray !== false,
221 "LinkFilter::makeLikeArray('$pattern', '$protocol') returned false on a valid pattern"
222 );
223
224 $regex = $this->createRegexFromLIKE( $likeArray );
225 $debugmsg = "Regex: '" . $regex . "'\n";
226 $debugmsg .= count( $indexes ) . " index(es) created by LinkFilter::makeIndexes():\n";
227
228 $matches = 0;
229
230 foreach ( $indexes as $index ) {
231 $matches += preg_match( $regex, $index );
232 $debugmsg .= "\t'$index'\n";
233 }
234
235 if ( !empty( $options['found'] ) ) {
236 $this->assertTrue(
237 $matches > 0,
238 "Search pattern '$protocol$pattern' does not find url '$url' \n$debugmsg"
239 );
240 } else {
241 $this->assertFalse(
242 $matches > 0,
243 "Search pattern '$protocol$pattern' should not find url '$url' \n$debugmsg"
244 );
245 }
246 }
247
253 public static function provideInvalidPatterns() {
254 return [
255 [ '' ],
256 [ '*' ],
257 [ 'http://*' ],
258 [ 'http://*/' ],
259 [ 'http://*/dir/file' ],
260 [ 'test.*.com' ],
261 [ 'http://test.*.com' ],
262 [ 'test.*.com' ],
263 [ 'http://*.test.*' ],
264 [ 'http://*test.com' ],
265 [ 'https://*' ],
266 [ '*://test.com' ],
267 [ 'mailto:name:pass@t*est.com' ],
268 [ 'http://*:888/' ],
269 [ '*http://' ],
270 [ 'test.com/*/index' ],
271 [ 'test.com/dir/index?arg=*' ],
272 ];
273 }
274
284 function testMakeLikeArrayWithInvalidPatterns( $pattern ) {
285 $this->assertFalse(
286 LinkFilter::makeLikeArray( $pattern ),
287 "'$pattern' is not a valid pattern and should be rejected"
288 );
289 }
290
295 public function testMakeIndexes( $url, $expected ) {
296 // Set global so file:// tests can work
297 $this->setMwGlobals( [
298 'wgUrlProtocols' => [
299 'http://',
300 'https://',
301 'mailto:',
302 '//',
303 'file://', # Non-default
304 ],
305 ] );
306
307 $index = LinkFilter::makeIndexes( $url );
308 $this->assertEquals( $expected, $index, "LinkFilter::makeIndexes(\"$url\")" );
309 }
310
311 public static function provideMakeIndexes() {
312 return [
313 // Testcase for T30627
314 [
315 'https://example.org/test.cgi?id=12345',
316 [ 'https://org.example./test.cgi?id=12345' ]
317 ],
318 [
319 // mailtos are handled special
320 'mailto:wiki@wikimedia.org',
321 [ 'mailto:org.wikimedia.@wiki' ]
322 ],
323 [
324 // mailtos are handled special
325 'mailto:wiki',
326 [ 'mailto:@wiki' ]
327 ],
328
329 // file URL cases per T30627...
330 [
331 // three slashes: local filesystem path Unix-style
332 'file:///whatever/you/like.txt',
333 [ 'file://./whatever/you/like.txt' ]
334 ],
335 [
336 // three slashes: local filesystem path Windows-style
337 'file:///c:/whatever/you/like.txt',
338 [ 'file://./c:/whatever/you/like.txt' ]
339 ],
340 [
341 // two slashes: UNC filesystem path Windows-style
342 'file://intranet/whatever/you/like.txt',
343 [ 'file://intranet./whatever/you/like.txt' ]
344 ],
345 // Multiple-slash cases that can sorta work on Mozilla
346 // if you hack it just right are kinda pathological,
347 // and unreliable cross-platform or on IE which means they're
348 // unlikely to appear on intranets.
349 // Those will survive the algorithm but with results that
350 // are less consistent.
351
352 // protocol-relative URL cases per T31854...
353 [
354 '//example.org/test.cgi?id=12345',
355 [
356 'http://org.example./test.cgi?id=12345',
357 'https://org.example./test.cgi?id=12345'
358 ]
359 ],
360
361 // IP addresses
362 [
363 'http://192.0.2.0/foo',
364 [ 'http://V4.192.0.2.0./foo' ]
365 ],
366 [
367 'http://192.0.0002.0/foo',
368 [ 'http://V4.192.0.2.0./foo' ]
369 ],
370 [
371 'http://[2001:db8::1]/foo',
372 [ 'http://V6.2001.DB8.0.0.0.0.0.1./foo' ]
373 ],
374
375 // Explicit specification of the DNS root
376 [
377 'http://example.com./foo',
378 [ 'http://com.example./foo' ]
379 ],
380 [
381 'http://192.0.2.0./foo',
382 [ 'http://V4.192.0.2.0./foo' ]
383 ],
384
385 // Weird edge case
386 [
387 'http://.example.com/foo',
388 [ 'http://com.example../foo' ]
389 ],
390 ];
391 }
392
397 public function testGetQueryConditions( $query, $options, $expected ) {
398 $conds = LinkFilter::getQueryConditions( $query, $options );
399 $this->assertEquals( $expected, $conds );
400 }
401
402 public static function provideGetQueryConditions() {
403 return [
404 'Basic example' => [
405 'example.com',
406 [],
407 [
408 'el_index_60 LIKE \'http://com.example./%\' ESCAPE \'`\' ',
409 'el_index LIKE \'http://com.example./%\' ESCAPE \'`\' ',
410 ],
411 ],
412 'Basic example with path' => [
413 'example.com/foobar',
414 [],
415 [
416 'el_index_60 LIKE \'http://com.example./foobar%\' ESCAPE \'`\' ',
417 'el_index LIKE \'http://com.example./foobar%\' ESCAPE \'`\' ',
418 ],
419 ],
420 'Wildcard domain' => [
421 '*.example.com',
422 [],
423 [
424 'el_index_60 LIKE \'http://com.example.%\' ESCAPE \'`\' ',
425 'el_index LIKE \'http://com.example.%\' ESCAPE \'`\' ',
426 ],
427 ],
428 'Wildcard domain with path' => [
429 '*.example.com/foobar',
430 [],
431 [
432 'el_index_60 LIKE \'http://com.example.%\' ESCAPE \'`\' ',
433 'el_index LIKE \'http://com.example.%/foobar%\' ESCAPE \'`\' ',
434 ],
435 ],
436 'Wildcard domain with path, oneWildcard=true' => [
437 '*.example.com/foobar',
438 [ 'oneWildcard' => true ],
439 [
440 'el_index_60 LIKE \'http://com.example.%\' ESCAPE \'`\' ',
441 'el_index LIKE \'http://com.example.%\' ESCAPE \'`\' ',
442 ],
443 ],
444 'Constant prefix' => [
445 'example.com/blah/blah/blah/blah/blah/blah/blah/blah/blah/blah?foo=',
446 [],
447 [
448 'el_index_60' => 'http://com.example./blah/blah/blah/blah/blah/blah/blah/blah/',
449 'el_index LIKE ' .
450 '\'http://com.example./blah/blah/blah/blah/blah/blah/blah/blah/blah/blah?foo=%\' ' .
451 'ESCAPE \'`\' ',
452 ],
453 ],
454 'Bad protocol' => [
455 'test/',
456 [ 'protocol' => 'invalid://' ],
457 false
458 ],
459 'Various options' => [
460 'example.com',
461 [ 'protocol' => 'https://', 'prefix' => 'xx' ],
462 [
463 'xx_index_60 LIKE \'https://com.example./%\' ESCAPE \'`\' ',
464 'xx_index LIKE \'https://com.example./%\' ESCAPE \'`\' ',
465 ],
466 ],
467 ];
468 }
469
470}
http
Apache License January http
Definition APACHE-LICENSE-2.0.txt:6
use
Apache License January AND DISTRIBUTION Definitions License shall mean the terms and conditions for use
Definition APACHE-LICENSE-2.0.txt:10
LinkFilterTest
LinkFilter Database.
Definition LinkFilterTest.php:9
LinkFilterTest\createRegexFromLIKE
createRegexFromLIKE( $like)
createRegexFromLike($like)
Definition LinkFilterTest.php:41
LinkFilterTest\provideValidPatterns
static provideValidPatterns()
provideValidPatterns()
Definition LinkFilterTest.php:67
LinkFilterTest\testGetQueryConditions
testGetQueryConditions( $query, $options, $expected)
provideGetQueryConditions LinkFilter::getQueryConditions
Definition LinkFilterTest.php:397
LinkFilterTest\provideGetQueryConditions
static provideGetQueryConditions()
Definition LinkFilterTest.php:402
LinkFilterTest\testMakeLikeArrayWithValidPatterns
testMakeLikeArrayWithValidPatterns( $protocol, $pattern, $url, $options=[])
testMakeLikeArrayWithValidPatterns()
Definition LinkFilterTest.php:211
LinkFilterTest\testMakeIndexes
testMakeIndexes( $url, $expected)
provideMakeIndexes() LinkFilter::makeIndexes
Definition LinkFilterTest.php:295
LinkFilterTest\provideInvalidPatterns
static provideInvalidPatterns()
provideInvalidPatterns()
Definition LinkFilterTest.php:253
LinkFilterTest\provideMakeIndexes
static provideMakeIndexes()
Definition LinkFilterTest.php:311
LinkFilterTest\testMakeLikeArrayWithInvalidPatterns
testMakeLikeArrayWithInvalidPatterns( $pattern)
testMakeLikeArrayWithInvalidPatterns()
Definition LinkFilterTest.php:284
LinkFilter\makeIndexes
static makeIndexes( $url)
Converts a URL into a format for el_index.
Definition LinkFilter.php:171
LinkFilter\makeLikeArray
static makeLikeArray( $filterEntry, $protocol='http://')
Make an array to be used for calls to Database::buildLike(), which will match the specified string.
Definition LinkFilter.php:312
LinkFilter\getQueryConditions
static getQueryConditions( $filterEntry, array $options=[])
Return query conditions which will match the specified string.
Definition LinkFilter.php:254
LinkFilter\supportsIDN
static supportsIDN()
Indicate whether LinkFilter IDN support is available.
Definition LinkFilter.php:88
MediaWikiLangTestCase
Base class that store and restore the Language objects.
Definition MediaWikiLangTestCase.php:8
MediaWikiTestCase\setMwGlobals
setMwGlobals( $pairs, $value=null)
Sets a global, maintaining a stashed version of the previous global to be restored in tearDown.
Definition MediaWikiTestCase.php:709
Wikimedia\Rdbms\LikeMatch
Used by Database::buildLike() to represent characters that have special meaning in SQL LIKE clauses a...
Definition LikeMatch.php:10
as
This document is intended to provide useful advice for parties seeking to redistribute MediaWiki to end users It s targeted particularly at maintainers for Linux since it s been observed that distribution packages of MediaWiki often break We ve consistently had to recommend that users seeking support use official tarballs instead of their distribution s and this often solves whatever problem the user is having It would be nice if this could such as
Definition distributors.txt:22
$options
null means default in associative array with keys and values unescaped Should be merged with default with a value of false meaning to suppress the attribute in associative array with keys and values unescaped & $options
Definition hooks.txt:1999
true
null means default in associative array with keys and values unescaped Should be merged with default with a value of false meaning to suppress the attribute in associative array with keys and values unescaped noclasses just before the function returns a value If you return true
Definition hooks.txt:2004
$query
null for the local wiki Added should default to null in handler for backwards compatibility add a value to it if you want to add a cookie that have to vary cache options can modify $query
Definition hooks.txt:1617
false
processing should stop and the error should be shown to the user * false
Definition hooks.txt:187
php
injection txt This is an overview of how MediaWiki makes use of dependency injection The design described here grew from the discussion of RFC T384 The term dependency this means that anything an object needs to operate should be injected from the the object itself should only know narrow no concrete implementation of the logic it relies on The requirement to inject everything typically results in an architecture that based on two main types of and essentially stateless service objects that use other service objects to operate on the value objects As of the beginning MediaWiki is only starting to use the DI approach Much of the code still relies on global state or direct resulting in a highly cyclical dependency which acts as the top level factory for services in MediaWiki which can be used to gain access to default instances of various services MediaWikiServices however also allows new services to be defined and default services to be redefined Services are defined or redefined by providing a callback the instantiator that will return a new instance of the service When it will create an instance of MediaWikiServices and populate it with the services defined in the files listed by thereby bootstrapping the DI framework Per $wgServiceWiringFiles lists includes ServiceWiring php
Definition injection.txt:37