Fix sharing a single file gave 404

Added test to check that this works for a single file

api/src/Sharing.php

@@ -521,8 +521,15 @@ class Sharing
 				Header\Content::disposition(Vfs::basename($this->share['share_path']), false);
 			}
 			$GLOBALS['egw']->session->commit_session();
+
+			// WebDAV always looks at the original request for a single file so make sure the file is found at the root
+			Vfs::$is_root = true;
+			unset($GLOBALS['egw_info']['server']['vfs_fstab']);
+			Vfs::mount($this->share['resolve_url'], '/', false, false, true);
+			Vfs::clearstatcache();
+
 			$webdav_server = new Vfs\WebDAV();
-			$webdav_server->ServeRequest(Vfs::concat($this->share['share_root'], $this->share['share_token']));
+			$webdav_server->ServeRequest(Vfs::concat('/', $this->share['share_token']));
 			return;
 		}
 		return $this->get_ui();

api/tests/Vfs/SharingBase.php

@@ -494,6 +494,11 @@ class SharingBase extends LoggedInTest
 		{
 			$this->checkDirectoryLink($link, $share);
 		}
+		else
+		{
+			// If it's a file, check to make sure we get the file
+			$this->checkSharedFile($link, $path);
+		}
 
 		// Load share
 		$this->setup_info();
@@ -564,6 +569,46 @@ class SharingBase extends LoggedInTest
 		unset($data->data->content->nm->actions);
 		//var_dump($data->data->content->nm);
 	}
+
+	/**
+	 * Check that we actually find the file we shared at the target link
+	 *
+	 * @param $link Share URL
+	 * @param $file Vfs path to file
+	 */
+	public function checkSharedFile($link, $mimetype)
+	{
+		stream_context_set_default(
+				array(
+						'http' => array(
+								'method' => 'HEAD'
+						)
+				)
+		);
+		$headers = get_headers($link);
+		$this->assertEquals('200', substr($headers[0], 9, 3), 'Did not find the file, got ' . $headers[0]);
+
+		$indexed_headers = array();
+		foreach($headers as &$header)
+		{
+			list($key, $value) = explode(': ', $header);
+			if(is_string($indexed_headers[$key]))
+			{
+				$indexed_headers[$key] = array($indexed_headers[$key]);
+			}
+			if(is_array($indexed_headers[$key]))
+			{
+				$indexed_headers[$key][] = $value;
+			}
+			else
+			{
+				$indexed_headers[$key] = $value;
+			}
+		}
+
+		$this->assertStringContainsString($mimetype, $indexed_headers['Content-Type'], 'Wrong file type');
+	}
+
 	protected function setup_info()
 	{
 		// Copied from share.php

api/tests/Vfs/SharingTest.php

@@ -19,6 +19,7 @@ namespace EGroupware\Api\Vfs;
 
 require_once __DIR__ . '/SharingBase.php';
 
+use EGroupware\Api\LoggedInTest as LoggedInTest;
 use EGroupware\Api\Vfs;
 
 
@@ -260,4 +261,41 @@ class SharingTest extends SharingBase
 
 		$this->assertEquals($file, $created_share['share_path']);
 	}
+
+	/**
+	 * Test that a share of a single file gives the file (uses WebDAV)
+	 */
+	public function testSingleFile()
+	{
+		$dir = Vfs::get_home_dir().'/';
+
+		// Plain text file
+		$file = $dir.'test_file.txt';
+		$content = 'Testing that sharing a single (non-editable) file gives us the file.';
+		$this->assertTrue(
+			file_put_contents(Vfs::PREFIX.$file, $content) !== FALSE,
+			'Unable to write test file "' . Vfs::PREFIX . $file .'" - check file permissions for CLI user'
+		);
+		$this->files[] = $file;
+
+		$mimetype = Vfs::mime_content_type($file);
+
+		// Create and use link
+		$extra = array();
+		$this->getShareExtra($file, Sharing::READONLY, $extra);
+
+		$share = $this->createShare($file, Sharing::READONLY, $extra);
+		$link = Vfs\Sharing::share2link($share);
+
+		// Re-init, since they look at user, fstab, etc.
+		// Also, further tests that access the filesystem fail if we don't
+		Vfs::clearstatcache();
+		Vfs::init_static();
+		Vfs\StreamWrapper::init_static();
+
+		// Log out & clear cache
+		LoggedInTest::tearDownAfterClass();
+
+		$this->checkSharedFile($link, $mimetype);
+	}
 }