1 files changed, 63 insertions, 0 deletions
diff --git a/CheckUser/src/DurationManager.php b/CheckUser/src/DurationManager.php
new file mode 100644
index 00000000..8755bb98
--- /dev/null
+++ b/CheckUser/src/DurationManager.php
@@ -0,0 +1,63 @@
+<?php
+
+namespace MediaWiki\CheckUser;
+
+class DurationManager {
+
+	/**
+	 * Retrieves a valid duration from the request.
+	 *
+	 * @param \WebRequest $request
+	 * @return string
+	 */
+	public function getFromRequest( \WebRequest $request ) : string {
+		$value = $request->getVal( 'duration', '' );
+
+		if ( !$this->isValid( $value ) ) {
+			return '';
+		}
+
+		return $value;
+	}
+
+	/**
+	 * Return the timestamp from the duration.
+	 *
+	 * @param \WebRequest $request
+	 * @return string
+	 */
+	public function getTimestampFromRequest( \WebRequest $request ) : string {
+		$duration = $this->getFromRequest( $request );
+		if ( $duration === '' ) {
+			return $duration;
+		}
+
+		try {
+			$interval = new \DateInterval( $duration );
+			$now = \DateTime::createFromFormat( 'U', (string)\MWTimestamp::time() );
+			return \MWTimestamp::convert( TS_MW, $now->sub( $interval ) );
+		} catch ( \Exception $e ) {
+			return '';
+		}
+	}
+
+	/**
+	 * Determine if duration is valid.
+	 *
+	 * @param string $value
+	 * @return bool
+	 */
+	public function isValid( string $value ) : bool {
+		// No value implies "all"
+		if ( $value === '' ) {
+			return true;
+		}
+
+		try {
+			$interval = new \DateInterval( $value );
+			return true;
+		} catch ( \Exception $e ) {
+			return false;
+		}
+	}
+}