4 files changed, 30 insertions, 0 deletions
diff --git a/lib/private/Files/SimpleFS/NewSimpleFile.php b/lib/private/Files/SimpleFS/NewSimpleFile.php
index f805403fd87..76fc69ebbe7 100644
--- a/lib/private/Files/SimpleFS/NewSimpleFile.php
+++ b/lib/private/Files/SimpleFS/NewSimpleFile.php
@@ -191,6 +191,17 @@ class NewSimpleFile implements ISimpleFile {
 	}
 
 	/**
+	 * {@inheritDoc}
+	 */
+	public function getExtension(): string {
+		if ($this->file) {
+			return $this->file->getExtension();
+		} else {
+			return \pathinfo($this->name, PATHINFO_EXTENSION);
+		}
+	}
+
+	/**
 	 * Open the file as stream for reading, resulting resource can be operated as stream like the result from php's own fopen
 	 *
 	 * @return resource
diff --git a/lib/private/Files/SimpleFS/SimpleFile.php b/lib/private/Files/SimpleFS/SimpleFile.php
index baf9b24e020..21a2fd92dcb 100644
--- a/lib/private/Files/SimpleFS/SimpleFile.php
+++ b/lib/private/Files/SimpleFS/SimpleFile.php
@@ -159,6 +159,13 @@ class SimpleFile implements ISimpleFile {
 	}
 
 	/**
+	 * {@inheritDoc}
+	 */
+	public function getExtension(): string {
+		return $this->file->getExtension();
+	}
+
+	/**
 	 * Open the file as stream for reading, resulting resource can be operated as stream like the result from php's own fopen
 	 *
 	 * @return resource
diff --git a/lib/public/Files/SimpleFS/ISimpleFile.php b/lib/public/Files/SimpleFS/ISimpleFile.php
index 3287c42054f..c0db4cc22e9 100644
--- a/lib/public/Files/SimpleFS/ISimpleFile.php
+++ b/lib/public/Files/SimpleFS/ISimpleFile.php
@@ -103,6 +103,11 @@ interface ISimpleFile {
 	public function getMimeType();
 
 	/**
+	 * @since 24.0.0
+	 */
+	public function getExtension(): string;
+
+	/**
 	 * Open the file as stream for reading, resulting resource can be operated as stream like the result from php's own fopen
 	 *
 	 * @return resource
diff --git a/lib/public/Files/SimpleFS/InMemoryFile.php b/lib/public/Files/SimpleFS/InMemoryFile.php
index 6020b42d953..4606fe9bd8a 100644
--- a/lib/public/Files/SimpleFS/InMemoryFile.php
+++ b/lib/public/Files/SimpleFS/InMemoryFile.php
@@ -127,6 +127,13 @@ class InMemoryFile implements ISimpleFile {
 	}
 
 	/**
+	 * {@inheritDoc}
+	 */
+	public function getExtension(): string {
+		return \pathinfo($this->name, PATHINFO_EXTENSION);
+	}
+
+	/**
 	 * Stream reading is unsupported for in memory files.
 	 *
 	 * @throws NotPermittedException