[stable10] Backport of Add regex for shared object file names

lib/private/Files/Type/Detection.php

@@ -150,6 +150,26 @@ private function loadMappings() {
 		$this->registerTypeArray($mimetypeMapping);
 	}
 
+	/**
+	 * Detect if the file is a shared object file. We detect this file
+	 * with a regex.
+	 *
+	 * @param string $fileName
+	 * @return bool true if file is a shared object else false
+	 */
+	private function detectSharedObjFileName($fileName) {
+		\preg_match("/(.*?)(\.so)([\.]*?.*)/i", $fileName, $match);
+		/**
+		 * 1. Exactly 4 indexes to match ( check the regex grouping above preg_match )
+		 * 2. Check if the filename has '.so'
+		 * 3. Check if the filname has extension after '.so', say .so.1. or .so.
+		 * That is anything like '.so.*'. This match is made in the 4th index.
+		 * No extension after '.so' is considered to be shared object file
+		 */
+		return (\count($match) === 4) && ($match[2] === '.so')
+			&& ($match[3] === '' || ($match[3] !== '' && \strpos($match[3], '.') === 0));
+	}
+
 	/**
 	 * @return array
 	 */
@@ -171,8 +191,12 @@ public function detectPath($path) {
 		// note: leading dot doesn't qualify as extension
 		if (\strpos($fileName, '.') > 0) {
 			//try to guess the type by the file extension
-			$extension = \strtolower(\strrchr($fileName, '.'));
-			$extension = \substr($extension, 1); //remove leading .
+			if ($this->detectSharedObjFileName($fileName)) {
+				$extension = 'so';
+			} else {
+				$extension = \strtolower(\strrchr($fileName, '.'));
+				$extension = \substr($extension, 1); //remove leading .
+			}
 			return (isset($this->mimetypes[$extension], $this->mimetypes[$extension][0]))
 				? $this->mimetypes[$extension][0]
 				: 'application/octet-stream';

resources/config/mimetypemapping.dist.json

@@ -181,5 +181,6 @@
 	"yml": ["application/yaml", "text/plain"],
 	"zip": ["application/zip"],
 	"so": ["application/x-sharedlib"],
-	"dll": ["application/x-msdos-program"]
+	"dll": ["application/x-msdos-program"],
+	"dylib": ["application/x-sharedlib"]
 }

tests/lib/Files/Type/DetectionTest.php

@@ -78,7 +78,14 @@ public function testDetectPath() {
 		$this->assertEquals('image/png', $this->detection->detectPath('.hidden/foo.png'));
 		$this->assertEquals('image/png', $this->detection->detectPath('test.jpg/foo.png'));
 		$this->assertEquals('application/octet-stream', $this->detection->detectPath('.png'));
+		$this->assertEquals('application/x-sharedlib', $this->detection->detectPath('test.so'));
+		$this->assertEquals('application/x-sharedlib', $this->detection->detectPath('test.so.0.0.1'));
+		$this->assertEquals('application/x-sharedlib', $this->detection->detectPath('test.1.2.so.0.0.1'));
+		$this->assertEquals('application/x-sharedlib', $this->detection->detectPath('test.1.2.so.1'));
+		$this->assertEquals('application/x-sharedlib', $this->detection->detectPath('foo.so.'));
 		$this->assertEquals('application/octet-stream', $this->detection->detectPath('foo'));
+		$this->assertEquals('application/octet-stream', $this->detection->detectPath('foo.somany'));
+		$this->assertEquals('application/octet-stream', $this->detection->detectPath('foo.so*'));
 		$this->assertEquals('application/octet-stream', $this->detection->detectPath(''));
 	}