From d13ba0ee2d93080ba56776442b9d39a53e2b6321 Mon Sep 17 00:00:00 2001
From: Michael Gapczynski <GapczynskiM@gmail.com>
Date: Sat, 30 Jul 2011 16:03:32 -0400
Subject: [PATCH] Revise permissions system to support read, write, and delete

---
 apps/files_sharing/appinfo/database.xml |  2 +-
 apps/files_sharing/js/share.js          | 21 +++----
 apps/files_sharing/lib_share.php        | 52 +++++++++--------
 apps/files_sharing/sharedstorage.php    | 78 ++++++++++++++++---------
 4 files changed, 90 insertions(+), 63 deletions(-)

diff --git a/apps/files_sharing/appinfo/database.xml b/apps/files_sharing/appinfo/database.xml
index 7ddaca21ae..3378b6b09e 100644
--- a/apps/files_sharing/appinfo/database.xml
+++ b/apps/files_sharing/appinfo/database.xml
@@ -32,7 +32,7 @@
 				<length>128</length>
 			</field>
 			<field>
-				<name>is_writeable</name>
+				<name>permissions</name>
 				<type>integer</type>
 				<notnull>true</notnull>
 				<length>1</length>
diff --git a/apps/files_sharing/js/share.js b/apps/files_sharing/js/share.js
index a519ec6d5c..c688007ddb 100644
--- a/apps/files_sharing/js/share.js
+++ b/apps/files_sharing/js/share.js
@@ -32,10 +32,6 @@ $(document).ready(function() {
 		alert("remove");
 		// TODO Remove corresponding row
 	});
-	$('#toggle-private-advanced').live('click', function(event) {
-		event.preventDefault();
-		$('#private-advanced').toggle();
-	});
 	$('#expire').datepicker({
 		dateFormat:'MM d, yy',
 		altField: "#expire_time",
@@ -69,8 +65,8 @@ $(document).ready(function() {
 	});
 });
 
-function createShareDialog(files) {
-	var html = "<div id='dialog' title='Share "+files+"' align='center'>";
+function createShareDialog(fileNames) {
+	var html = "<div id='dialog' align='center'>";
 	html += "<label><input type='radio' name='share_type' value='private' checked='checked' /> Private</label>";
 	html += "<label><input type='radio' name='share_type' value='public' /> Public</label>";
 	html += "<br />";
@@ -78,13 +74,12 @@ function createShareDialog(files) {
 	html += "<label>Share with <input placeholder='User or Group' class='uid_shared_with' /></label>";
 	html += "<button id='hey' class='add-uid_shared_with fancybutton'>+</button>";
 	html += "<br />";
-	html += "<a id='toggle-private-advanced'>Advanced</a>";
+	html += "<div id='permissions'style='text-align: left'>";
+	html += "Permissions"
 	html += "<br />";
-	html += "<div id='private-advanced' style='display: none; text-align: left'>";
-	html += "<label><input type='checkbox' name='share_permissions' value='read' checked='checked' disabled='disable' /> Read</label><br />";
-	html += "<label><input type='checkbox' name='share_permissions' value='write' /> Write</label><br />";
-	html += "<label><input type='checkbox' name='share_permissions' value='rename' /> Rename</label><br />";
-	html += "<label><input type='checkbox' name='share_permissions' value='delete' /> Delete</label><br />";
+	html += "<label><input type='checkbox' name='share_permissions' value='0' checked='checked' disabled='disable' /> Read</label><br />";
+	html += "<label><input type='checkbox' name='share_permissions' value='1' /> Write</label><br />"; 
+	html += "<label><input type='checkbox' name='share_permissions' value='2' /> Delete</label><br />";
 	html += "</div>";
 	html += "</div>";
 	html += "<div id='public' style='display: none'>";
@@ -95,6 +90,8 @@ function createShareDialog(files) {
 	html += "<button class='submit fancybutton'>Share</button>";
 	html += "<div>";
 	$(html).dialog({
+		title: "Share " + fileNames,
+		modal: true,
 		close: function(event, ui) {
 			$(this).remove();
 		}
diff --git a/apps/files_sharing/lib_share.php b/apps/files_sharing/lib_share.php
index b096a956e7..fa74cd14ee 100644
--- a/apps/files_sharing/lib_share.php
+++ b/apps/files_sharing/lib_share.php
@@ -27,7 +27,10 @@ OC_HOOK::connect("OC_FILESYSTEM","post_rename", "OC_SHARE", "renameItem");
  * This class manages shared items within the database. 
  */
 class OC_SHARE {
-	
+
+	const WRITE = 1;
+	const DELETE = 2;
+      
 	/**
 	 * TODO notify user a file is being shared with them?
 	 * Share an item, adds an entry into the database
@@ -101,7 +104,7 @@ class OC_SHARE {
 		$source = $folders['source'].substr($oldTarget, strlen($folders['target']));
 		$item = self::getItem($folders['target']);
 		$query = OC_DB::prepare("INSERT INTO *PREFIX*sharing VALUES(?,?,?,?,?)");
-		$query->execute(array($item[0]['uid_owner'], OC_USER::getUser(), $source, $newTarget, $item[0]['is_writeable']));
+		$query->execute(array($item[0]['uid_owner'], OC_USER::getUser(), $source, $newTarget, $item[0]['permissions']));
 	}
 
 	/**
@@ -111,7 +114,7 @@ class OC_SHARE {
 	 */
 	public static function getItem($target) {
 		$target = self::cleanPath($target);
-		$query = OC_DB::prepare("SELECT uid_owner, source, is_writeable  FROM *PREFIX*sharing WHERE target = ? AND uid_shared_with = ? LIMIT 1");
+		$query = OC_DB::prepare("SELECT uid_owner, source, permissions FROM *PREFIX*sharing WHERE target = ? AND uid_shared_with = ? LIMIT 1");
 		return $query->execute(array($target, OC_USER::getUser()))->fetchAll();
 	}
 	
@@ -120,7 +123,7 @@ class OC_SHARE {
 	 * @return An array with all items the user is sharing
 	 */
 	public static function getMySharedItems() {
-		$query = OC_DB::prepare("SELECT uid_shared_with, source, is_writeable FROM *PREFIX*sharing WHERE uid_owner = ?");
+		$query = OC_DB::prepare("SELECT uid_shared_with, source, permissions FROM *PREFIX*sharing WHERE uid_owner = ?");
 		return $query->execute(array(OC_USER::getUser()))->fetchAll();
 	}
 	
@@ -185,32 +188,33 @@ class OC_SHARE {
 			return $result[0]['source'];
 		} else {
 			$folders = self::getParentFolders($target);
-			if ($folders == false) {
-				return false;
-			} else {
+			if ($folders == true) {
 				return $folders['source'].substr($target, strlen($folders['target']));
+			} else {
+				return false;
 			}
 		}
 	}
 
 	/**
-	 * Check if the user has write permission for the item at the specified target location
+	 * Get the user's permissions for the item at the specified target location
 	 * @param $target The target location of the item
-	 * @return True if the user has write permission or false if read only
+	 * @return The permissions, use bitwise operators to check against the constants WRITE and DELETE
 	 */
-	public static function isWriteable($target) {
+	public static function getPermissions($target) {
 		$target = self::cleanPath($target);
 		$userAndGroups = self::getUserAndGroups();
-		$query = OC_DB::prepare("SELECT is_writeable FROM *PREFIX*sharing WHERE target = ? AND uid_shared_with IN(".substr(str_repeat(",?", count($userAndGroups)), 1).") LIMIT 1");
+		$query = OC_DB::prepare("SELECT permissions FROM *PREFIX*sharing WHERE target = ? AND uid_shared_with IN(".substr(str_repeat(",?", count($userAndGroups)), 1).") LIMIT 1");
 		$result = $query->execute(array_merge(array($target), $userAndGroups))->fetchAll();
 		if (count($result) > 0) {
-			return $result[0]['is_writeable'];
+			return $result[0]['permissions'];
 		} else {
-			// Check if the folder is writeable
-			$folders = OC_SHARE::getParentFolders($target);
-			$result = $query->execute(array_merge(array($target), $userAndGroups))->fetchAll();
-			if (count($result) > 0) {
-				return $result[0]['is_writeable'];
+			$folders =self::getParentFolders($target);
+			if ($folders == true) {
+				$result = $query->execute(array_merge(array($folders), $userAndGroups))->fetchAll();
+				if (count($result) > 0) {
+					return $result[0]['permissions'];
+				}
 			} else {
 				return false;
 			}
@@ -245,18 +249,18 @@ class OC_SHARE {
 	}
 	
 	/**
-	* Change write permission for the specified item and user
+	* Change the permissions for the specified item and user
 	*
-	* You must construct a new shared item to change the write permission of a file inside a shared folder if the write permission differs from the folder
+	* You must construct a new shared item to change the permissions of a file inside a shared folder if the permissions differ from the folder
 	*
 	* @param $source The source location of the item
-	* @param $uid_shared_with Array of users to change the write permission for
-	* @param $is_writeable True if the user has write permission or false if read only
+	* @param $uid_shared_with The user to change the permissions for
+	* @param $permissions The permissions, use the constants WRITE and DELETE
 	*/
-	public static function setIsWriteable($source, $uid_shared_with, $is_writeable) {
+	public static function setPermissions($source, $uid_shared_with, $permissions) {
 		$source = self::cleanPath($source);
-		$query = OC_DB::prepare("UPDATE *PREFIX*sharing SET is_writeable = ? WHERE SUBSTR(source, 1, ?) = ? AND uid_shared_with = ? AND uid_owner = ?");
-		$query->execute(array($is_writeable, strlen($source), $source, $uid_shared_with, OC_USER::getUser()));
+		$query = OC_DB::prepare("UPDATE *PREFIX*sharing SET permissions = ? WHERE SUBSTR(source, 1, ?) = ? AND uid_shared_with = ? AND uid_owner = ?");
+		$query->execute(array($permissions, strlen($source), $source, $uid_shared_with, OC_USER::getUser()));
 	}
 	
 	/**
diff --git a/apps/files_sharing/sharedstorage.php b/apps/files_sharing/sharedstorage.php
index 8efccbc769..44a78277fc 100644
--- a/apps/files_sharing/sharedstorage.php
+++ b/apps/files_sharing/sharedstorage.php
@@ -59,7 +59,7 @@ class OC_FILESTORAGE_SHARED extends OC_FILESTORAGE {
 		} else {
 			$source = $this->getSource($path);
 			if ($source) {
-				if (OC_SHARE::isWriteable($this->datadir.$path)) {
+				if ($this->is_writeable($path)) {
 					$storage = OC_FILESYSTEM::getStorage($source);
 					return $storage->mkdir($this->getInternalPath($source));
 				}
@@ -214,7 +214,7 @@ class OC_FILESTORAGE_SHARED extends OC_FILESTORAGE {
 	
 	public function getFolderSize($path) {
 		if ($path == "" || $path == "/") {
-			$dbpath = OC_USER::getUser()."/files/Share/";
+			$dbpath = $this->datadir;
 		} else {
 			$source = $this->getSource($path);
 			$dbpath = $this->getInternalPath($source);
@@ -267,10 +267,10 @@ class OC_FILESTORAGE_SHARED extends OC_FILESTORAGE {
 	}
 	
 	public function is_writeable($path) {
-		if ($path == "" || $path == "/") {
+		if ($path == "" || $path == "/" || OC_SHARE::getPermissions($this->datadir.$path) & OC_SHARE::WRITE) {
 			return true;
 		} else {
-			return OC_SHARE::isWriteable($this->datadir.$path);
+			return false;
 		}
 	}
 	
@@ -362,42 +362,68 @@ class OC_FILESTORAGE_SHARED extends OC_FILESTORAGE {
 		}
 	}
 	
-	// TODO OC_SHARE::getPermissions()
 	public function file_put_contents($path, $data) {
-		$source = $this->getSource($path);
-		if ($source) {
-			$storage = OC_FILESYSTEM::getStorage($source);
-			return $storage->file_put_contents($this->getInternalPath($source), $data);
+		if ($this->is_writeable($path)) {
+			$source = $this->getSource($path);
+			if ($source) {
+				$storage = OC_FILESYSTEM::getStorage($source);
+				return $storage->file_put_contents($this->getInternalPath($source), $data);
+			}
 		}
 	}
 	
 	public function unlink($path) {
-		// The file will be removed from the database, but won't be touched on the owner's filesystem
 		$target = $this->datadir.$path;
-		// If file is inside a shared folder
-		if (OC_SHARE::getParentFolders($target)) {
-			// If entry for file already exists
-			if (OC_SHARE::getItem($target)) {
-				OC_SHARE::setTarget($target, "/");
-			} else {
-				OC_SHARE::pullOutOfFolder($target, "/");
+		// If the user has delete permission for the item, the source item will be deleted
+		if (OC_SHARE::getPermissions($target) & OC_SHARE::DELETE) {
+			$source = $this->getSource($path);
+			if ($source) {
+				$storage = OC_FILESYSTEM::getStorage($source);
+				return $storage->unlink($this->getInternalPath($source));
 			}
+		// The item will be removed from the database, but won't be touched on the owner's filesystem
 		} else {
-			OC_SHARE::unshareFromMySelf($target);
+			// Check if the item is inside a shared folder
+			if (OC_SHARE::getParentFolders($target)) {
+				// If entry for item already exists
+				if (OC_SHARE::getItem($target)) {
+					OC_SHARE::setTarget($target, "/");
+				} else {
+					OC_SHARE::pullOutOfFolder($target, "/");
+					// If this is a folder being deleted, call setTarget in case there are any database entries inside the folder
+					if (self::is_dir($path)) {
+						OC_SHARE::setTarget($target, "/");
+					}
+				}
+			// Delete the database entry
+			} else {
+				OC_SHARE::unshareFromMySelf($target);
+			}
 		}
 		return true;
 	}
 	
 	public function rename($path1, $path2) {
-		// The file will be renamed in the database, but won't be touched on the owner's filesystem
-		$oldTarget = $this->datadir.$path1;
-		$newTarget = $this->datadir.$path2;
-		if (OC_SHARE::getItem($oldTarget)) {
-			OC_SHARE::setTarget($oldTarget, $newTarget);
+		// If the user has write permission for the item, the source item will be renamed
+		if ($this->is_writeable($path1)) {
+			$source = $this->getSource($path1);
+			if ($source) {
+				$storage = OC_FILESYSTEM::getStorage($source);
+				return $storage->rename($path1, $path2);
+			}
+		// The item will be renamed in the database, but won't be touched on the owner's filesystem
 		} else {
-			OC_SHARE::pullOutOfFolder($oldTarget, $newTarget);
-			if (self::is_dir($path1)) {
+			$oldTarget = $this->datadir.$path1;
+			$newTarget = $this->datadir.$path2;
+			if (OC_SHARE::getItem($oldTarget)) {
 				OC_SHARE::setTarget($oldTarget, $newTarget);
+			// There is no entry in the database for the item, it must be inside a shared folder
+			} else {
+				OC_SHARE::pullOutOfFolder($oldTarget, $newTarget);
+				// If this is a folder being renamed, call setTarget in case there are any database entries inside the folder
+				if (self::is_dir($path1)) {
+					OC_SHARE::setTarget($oldTarget, $newTarget);
+				}
 			}
 		}
 		return true;
@@ -407,7 +433,7 @@ class OC_FILESTORAGE_SHARED extends OC_FILESTORAGE {
 		if ($path2 == "" || $path2 == "/") {
 			// TODO Construct new shared item or should this not be allowed?
 		} else {
-			if ($this->is_writeable($path)) {
+			if ($this->is_writeable($path2)) {
 				$tmpFile = $this->toTmpFile($path1);
 				return $this->fromTmpFile($tmpFile, $path2);
 			} else {