Introduce entry point classes for media files.

This moves a code out of file scope into classes to make it
testable. The code is left in the same structure as it was before,
global functions have been converted into methods on the new
ThumbnailEntryPoint and Thumbnail404EntryPoint classes.

This test introduces comprehensive phpunit tests covering all functional
code paths in ThumbnailEntryPoint. This is intended to support
refactoring of this code.

Change-Id: I459abc7b11d0ab4ee682a863c9525a945048296f

1 files changed, 14 insertions, 4 deletions

diff --git a/thumb_handler.php b/thumb_handler.php
index 2ae895645f29..d947f86430bb 100644
--- a/thumb_handler.php
+++ b/thumb_handler.php
@@ -8,6 +8,8 @@
  * if it was a request to thumb.php with the relevant query parameters filled
  * out. See also $wgGenerateThumbnailOnParse.
  *
+ * @see thumb.php
+ *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
@@ -28,9 +30,17 @@
  * @ingroup Media
  */
 
-define( 'THUMB_HANDLER', true );
+use MediaWiki\EntryPointEnvironment;
+use MediaWiki\FileRepo\Thumbnail404EntryPoint;
+use MediaWiki\MediaWikiServices;
+
+define( 'MW_NO_OUTPUT_COMPRESSION', 1 );
 define( 'MW_ENTRY_POINT', 'thumb_handler' );
 
-// Execute thumb.php, having set THUMB_HANDLER so that
-// it knows to extract params from a thumbnail file URL.
-require __DIR__ . '/thumb.php';
+require __DIR__ . '/includes/WebStart.php';
+
+( new Thumbnail404EntryPoint(
+	RequestContext::getMain(),
+	new EntryPointEnvironment(),
+	MediaWikiServices::getInstance()
+) )->run();