diff --git a/lib/filestorage/google.php b/lib/filestorage/google.php
index dd898b7955de26184198a49e2850cb64e4f8e3c8..0c562941d41155d209a4e87fb64795c09fc0048a 100644
--- a/lib/filestorage/google.php
+++ b/lib/filestorage/google.php
@@ -20,12 +20,15 @@
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-class OC_Filestorage_Google {
+require_once 'common.inc.php';
+
+class OC_Filestorage_Google extends OC_Filestorage_Common {
 
 	private $datadir;
 	private $consumer;
 	private $oauth_token;
 	private $sig_method;
+	private $entries;
 
 	public function __construct($arguments) {
 		$this->datadir = $arguments['datadir'];
@@ -34,6 +37,7 @@ class OC_Filestorage_Google {
 		$this->consumer = new OAuthConsumer($consumer_key, $consumer_secret);
 		$this->oauth_token = new OAuthToken($arguments['token'], $arguments['token_secret']);
 		$this->sig_method = new OAuthSignatureMethod_HMAC_SHA1();
+		$this->entries = array();
 	}
 
 	private function sendRequest($feedUri, $http_method, $postData = null) {
@@ -66,32 +70,59 @@ class OC_Filestorage_Google {
 	}
 
 	private function getResource($path) {
-		// TODO Look up google docs query caching/only send back if changes occured
-		// TODO Look inside of collections for specific file
-		// TODO Strip extension
-		$title = basename($path);
-		return $this->sendRequest('https://docs.google.com/feeds/default/private/full?showfolders=true&title='.$title.'&title-exact=true', 'GET');
+		if (array_key_exists($path, $this->entries)) {
+			return $this->entries[$path];
+		} else {
+			$title = basename($path);
+			$dom = $this->sendRequest('https://docs.google.com/feeds/default/private/full?showfolders=true&title='.$title, 'GET');
+			// Check if request was successful and entry exists
+			if ($dom && $entry = $dom->getElementsByTagName('entry')->item(0)) {
+				$this->entries[$path] = $entry;
+				return $entry;
+			}
+			return false;
+		}
 	}
 
+	private function getExtension($entry) {
+		$mimetype = $this->getMimeType('', $entry);
+		switch($mimetype) {
+			case 'httpd/unix-directory':
+				return '';
+			case 'application/vnd.oasis.opendocument.text':
+				return 'odt';
+			case 'application/vnd.oasis.opendocument.spreadsheet':
+				return 'ods';
+			case 'application/vnd.oasis.opendocument.presentation':
+				return 'pptx';
+			case 'text/html':
+				return 'html';
+			default:
+				return 'html';
+		}
+	}
+	
+
 	public function mkdir($path) {
 		$dir = dirname($path);
 		// Check if path parent is root directory
 		if ($dir == '/' || $dir == '\.' || $dir == '.') {
 			$feedUri = 'https://docs.google.com/feeds/default/private/full';
 		// Get parent content link
-		} else {
-			$dom = $this->getResource(basename($dir));
+		} else if ($dom = $this->getResource(basename($dir))) {
 			$feedUri = $dom->getElementsByTagName('content')->item(0)->getAttribute('src');
 		}
-		$title = basename($path);
-		// Construct post data
-		$postData = '<?xml version="1.0" encoding="UTF-8"?>';
-		$postData .= '<entry xmlns="http://www.w3.org/2005/Atom">';
-		$postData .= '<category scheme="http://schemas.google.com/g/2005#kind" term="http://schemas.google.com/docs/2007#folder"/>';
-		$postData .= '<title>'.$title.'</title>';
-		$postData .= '</entry>';
-		if ($dom = $this->sendRequest($feedUri, 'POST', $postData)) {
-			return true;
+		if (isset($feedUri)) {
+			$title = basename($path);
+			// Construct post data
+			$postData = '<?xml version="1.0" encoding="UTF-8"?>';
+			$postData .= '<entry xmlns="http://www.w3.org/2005/Atom">';
+			$postData .= '<category scheme="http://schemas.google.com/g/2005#kind" term="http://schemas.google.com/docs/2007#folder"/>';
+			$postData .= '<title>'.$title.'</title>';
+			$postData .= '</entry>';
+			if ($dom = $this->sendRequest($feedUri, 'POST', $postData)) {
+				return true;
+			}
 		}
 		return false;
 	}
@@ -102,106 +133,87 @@ class OC_Filestorage_Google {
 
 	public function opendir($path) {
 		if ($path == '' || $path == '/') {
-			$resource = 'https://docs.google.com/feeds/default/private/full/folder%3Aroot/contents';
-			$dom = $this->sendRequest('https://docs.google.com/feeds/default/private/full/folder%3Aroot/contents', 'GET');
+			$next = 'https://docs.google.com/feeds/default/private/full/folder%3Aroot/contents';
 		} else {
-			$dom = $this->getResource($path); 
+			if ($entry = $this->getResource($path)) {
+				$collectionId = $entry->getElementsByTagNameNS('http://schemas.google.com/g/2005', 'resourceId')->item(0)->nodeValue;
+				$next = 'https://docs.google.com/feeds/default/private/full/folder%3A'.$collectionId.'/contents';
+			} else {
+				return false;
+			}
 		}
-		global $FAKEDIRS;
 		$files = array();
-// 		while ($next) {
-// 			// send request $next link
-// 			$links = $dom->getElementsByTagName('link');
-// 			foreach ($links as $link) {
-// 				if ($link->getAttribute('rel') == 'next') {
-// 					$next = $link->getAttribute('src');
-// 					break;
-// 				} else {
-// 					$next = false;
-// 				}
-// 			}
+		while ($next) {
+			$dom = $this->sendRequest($next, 'GET');
+			$links = $dom->getElementsByTagName('link');
+			foreach ($links as $link) {
+				if ($link->getAttribute('rel') == 'next') {
+					$next = $link->getAttribute('src');
+					break;
+				} else {
+					$next = false;
+				}
+			}
 			$entries = $dom->getElementsByTagName('entry');
-			foreach($entries as $entry) {
+			foreach ($entries as $entry) {
 				$name = $entry->getElementsByTagName('title')->item(0)->nodeValue;
-				// Native Google resources don't include extensions in title
+				// Google Docs resources don't always include extensions in title
 				if (!strpos($name, '.')) {
-					if ($ext = $this->filetype('', $entry)) {
-						$name .= '.'.$ext;
-					}
+					$name .= '.'.$this->getExtension($entry);
 				}
 				$files[] = $name;
+				// Cache entry for future use
+				$this->entries[$name] = $entry;
 			}
-// 		}
-		$FAKEDIRS['google'] = $files;
+		}
+		OC_FakeDirStream::$dirs['google'] = $files;
 		return opendir('fakedir://google');
 	}
 
-	public function is_dir($path) {
-		if ($entry = $this->getResource($path)) {
+	public function stat($path) {
+		if ($path == '' || $path == '/') {
+			$stat['size'] = $this->free_space($path);
+			$stat['atime'] = time();
+			$stat['mtime'] = time();
+			$stat['ctime'] = time();
+		} else if ($entry = $this->getResource($path)) {
+			// NOTE: Native resources don't have a file size
+			$stat['size'] = $entry->getElementsByTagNameNS('http://schemas.google.com/g/2005', 'quotaBytesUsed')->item(0)->nodeValue;
+			$stat['atime'] = strtotime($entry->getElementsByTagNameNS('http://schemas.google.com/g/2005', 'lastViewed')->item(0)->nodeValue);
+			$stat['mtime'] = strtotime($entry->getElementsByTagName('updated')->item(0)->nodeValue);
+			$stat['ctime'] = strtotime($entry->getElementsByTagName('published')->item(0)->nodeValue);
+		}
+		return $stat;
+	}
+
+	public function filetype($path) {
+		if ($path == '' || $path == '/') {
+			return 'dir';
+		} else if ($entry = $this->getResource($path)) {
 			$categories = $entry->getElementsByTagName('category');
 			foreach ($categories as $category) {
 				if ($category->getAttribute('scheme') == 'http://schemas.google.com/g/2005#kind') {
-					// Check if label is equal to folder
 					$type = $category->getAttribute('label');
 					if (strlen(strstr($type, 'folder')) > 0) {
-						return true;
+						return 'dir';
+					} else {
+						return 'file';
 					}
 				}
 			}
 		}
-		return false; 
-	}
-
-	public function is_file($path) {
-		if ($this->getResource($path)) {
-			return true;
-		}
 		return false;
 	}
 
-	public function stat($path) {
-		if ($dom = $this->getResource($path)) {
-			// TODO Native resources don't have a file size
-			$stat['size'] =  $dom->getElementsByTagNameNS('http://schemas.google.com/g/2005', 'quotaBytesUsed')->item(0)->nodeValue;
-			$stat['mtime'] = strtotime($dom->getElementsByTagName('updated')->item(1)->nodeValue);
-			$stat['ctime'] = strtotime($dom->getElementsByTagName('published')->item(0)->nodeValue);
-			return $stat;
-		}
-		return false; 
-		
-	}
-
-	public function filetype($path, $entry = null) {
-		if ($entry == null) {
-			$entry = $this->getResource($path);
-		}
-		$categories = $entry->getElementsByTagName('category');
-		foreach ($categories as $category) {
-			if ($category->getAttribute('scheme') == 'http://schemas.google.com/g/2005#kind') {
-				// Guess extension from label, default to ODF extensions
-				$type = $category->getAttribute('label');
-				if (strlen(strstr($type, 'folder')) > 0) {
-					return '';
-				} else if (strlen(strstr($type, 'document')) > 0) {
-					return 'odt';
-				} else if (strlen(strstr($type, 'presentation')) > 0) {
-					return 'odp';
-				} else if (strlen(strstr($type, 'spreadsheet')) > 0) {
-					return 'ods';
-				} else {
-					return $type;
-				}
-			}
-		}
-	}
-
 	public function is_readable($path) {
 		return true;
 	}
 
 	public function is_writable($path) {
-		// Check if edit or edit-media links exist
-		if ($entry = $this->getResource($path)) {
+		if ($path == '' || $path == '/') {
+			return true;
+		} else if ($entry = $this->getResource($path)) {
+			// Check if edit or edit-media links exist
 			$links = $entry->getElementsByTagName('link');
 			foreach ($links as $link) {
 				if ($link->getAttribute('rel') == 'edit') {
@@ -215,7 +227,9 @@ class OC_Filestorage_Google {
 	}
 	
 	public function file_exists($path) {
-		if ($this->getResource($path)) {
+		if ($path == '' || $path == '/') {
+			return true;
+		} else if ($this->getResource($path)) {
 			return true;
 		}
 		return false;
@@ -238,24 +252,82 @@ class OC_Filestorage_Google {
 		return false;
 	}
 
-	public function rename($path1,$path2) {
-
+	public function rename($path1, $path2) {
+		// TODO Add support for moving to different collections
+		// Get resource edit link to rename resource
+		if ($entry = $this->getResource($path1)) {
+			$etag = $entry->getElementsByTagName('entry')->item(0)->getAttribute('gd:etag');
+			$links = $entry->getElementsByTagName('link');
+			foreach ($links as $link) {
+				if ($link->getAttribute('rel') == 'edit') {
+					$feedUri = $link->getAttribute('href');
+				}
+			}
+		}
+		if (isset($etag) && isset($feedUri)) {
+			$title = basename($path2);
+			// Construct post data
+			$postData = '<?xml version="1.0" encoding="UTF-8"?>';
+			$postData .= '<entry xmlns="http://www.w3.org/2005/Atom" xmlns:docs="http://schemas.google.com/docs/2007" xmlns:gd="http://schemas.google.com/g/2005" gd:etag='.$etag.'>';
+			$postData .= '<title>'.$title.'</title>';
+			$postData .= '</entry>';
+			$this->sendRequest($feedUri, 'PUT', $postData);
+			return true;
+		}
+		return false;
 	}
 
-	public function fopen($path,$mode){}
-
-	public function toTmpFile($path) {
-		$dom = $this->getResource($path);
-		$url = $dom->getElementsByTagName('content')->getAttribute('src');		
+	public function fopen($path, $mode) {
+		if ($entry = $this->getResource($path)) {
+			$extension = $this->getExtension($path);
+			$downloadUri = $entry->getElementsByTagName('content')->item(0)->getAttribute('src');
+			// TODO Non-native documents don't need these additional parameters
+			$downloadUri .= '&exportFormat='.$extension.'&format='.$extension;
+		}
 	}
 
-	public function fromTmpFile($tmpPath,$path){}
-	public function fromUploadedFile($tmpPath,$path){}
-	public function getMimeType($path){}
-	public function hash($type,$path,$raw){}
+	public function getMimeType($path, $entry = null) {
+		if ($entry == null) {
+			if ($path == '' || $path == '/') {
+				return 'httpd/unix-directory';
+			} else {
+				$entry = $this->getResource($path);
+			}
+		}
+		if ($entry) {
+			$mimetype = $entry->getElementsByTagName('content')->item(0)->getAttribute('type');
+			// Native Google Docs resources often default to text/html, but it may be more useful to default to a corresponding ODF mimetype
+			// Collections get reported as application/atom+xml, make sure it actually is a folder and fix the mimetype
+			if ($mimetype == 'text/html' || $mimetype == 'application/atom+xml') {
+				$categories = $entry->getElementsByTagName('category');
+				foreach ($categories as $category) {
+					if ($category->getAttribute('scheme') == 'http://schemas.google.com/g/2005#kind') {
+						$type = $category->getAttribute('label');
+						if (strlen(strstr($type, 'folder')) > 0) {
+							return 'httpd/unix-directory';
+						} else if (strlen(strstr($type, 'document')) > 0) {
+							return 'application/vnd.oasis.opendocument.text';
+						} else if (strlen(strstr($type, 'spreadsheet')) > 0) {
+							return 'application/vnd.oasis.opendocument.spreadsheet';
+						} else if (strlen(strstr($type, 'presentation')) > 0) {
+							return 'application/vnd.oasis.opendocument.presentation';
+						} else if (strlen(strstr($type, 'drawing')) > 0) {
+							return 'application/vnd.oasis.opendocument.graphics';
+						} else {
+							// If nothing matches return text/html, all native Google Docs resources can be exported as text/html
+							return 'text/html';
+						}
+					}
+				}
+			}
+			return $mimetype;
+		}
+		return false;
+	}
 	
 	public function free_space($path) {
 		if ($dom = $this->sendRequest('https://docs.google.com/feeds/metadata/default', 'GET')) {
+			// NOTE: Native Google Docs resources don't count towards quota
 			$total = $dom->getElementsByTagNameNS('http://schemas.google.com/g/2005', 'quotaBytesTotal')->item(0)->nodeValue;
 			$used = $dom->getElementsByTagNameNS('http://schemas.google.com/g/2005', 'quotaBytesUsed')->item(0)->nodeValue;
 			return $total - $used;
@@ -263,9 +335,8 @@ class OC_Filestorage_Google {
 		return false;
 	}
   
-	public function search($query){}
-	
-	public function getLocalFile($path) {
-		return false;
+	public function search($query) {
+		
 	}
+
 }
\ No newline at end of file