1 files changed, 68 insertions, 0 deletions
diff --git a/includes/registration/CoreVersionChecker.php b/includes/registration/CoreVersionChecker.php
new file mode 100644
index 00000000..f64d826d
--- /dev/null
+++ b/includes/registration/CoreVersionChecker.php
@@ -0,0 +1,68 @@
+<?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
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+use Composer\Semver\VersionParser;
+use Composer\Semver\Constraint\Constraint;
+
+/**
+ * @since 1.26
+ */
+class CoreVersionChecker {
+
+	/**
+	 * @var Constraint|bool representing $wgVersion
+	 */
+	private $coreVersion = false;
+
+	/**
+	 * @var VersionParser
+	 */
+	private $versionParser;
+
+	/**
+	 * @param string $coreVersion Current version of core
+	 */
+	public function __construct( $coreVersion ) {
+		$this->versionParser = new VersionParser();
+		try {
+			$this->coreVersion = new Constraint(
+				'==',
+				$this->versionParser->normalize( $coreVersion )
+			);
+		} catch ( UnexpectedValueException $e ) {
+			// Non-parsable version, don't fatal.
+		}
+	}
+
+	/**
+	 * Check that the provided constraint is compatible with the current version of core
+	 *
+	 * @param string $constraint Something like ">= 1.26"
+	 * @return bool
+	 */
+	public function check( $constraint ) {
+		if ( $this->coreVersion === false ) {
+			// Couldn't parse the core version, so we can't check anything
+			return true;
+		}
+
+		return $this->versionParser->parseConstraints( $constraint )
+			->matches( $this->coreVersion );
+	}
+}