Extract external file systems handling from isolated context.

webkit/fileapi/isolated_context.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "webkit/fileapi/isolated_context.h"
 
 #include "base/file_path.h"
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/rand_util.h"
@@ skipping 24 matching lines @@
   }
   return name;
 #else
   return FILE_PATH_LITERAL("<root>");
 #endif
 }
 
 bool IsSinglePathIsolatedFileSystem(FileSystemType type) {
   switch (type) {
     // As of writing dragged file system is the only filesystem
-    // which could have multiple toplevel paths.
+    // which could have multiple top-level paths.
     case kFileSystemTypeDragged:
       return false;
 
     case kFileSystemTypeUnknown:
       NOTREACHED();
       return true;
 
     default:
       return true;
   }
   NOTREACHED();
   return true;
 }
 
-}  // namespace
-
 static base::LazyInstance<IsolatedContext>::Leaky g_isolated_context =
     LAZY_INSTANCE_INITIALIZER;
 
-IsolatedContext::FileInfo::FileInfo() {}
-IsolatedContext::FileInfo::FileInfo(
-    const std::string& name, const FilePath& path)
-    : name(name), path(path) {}
+}  // namespace
 
 IsolatedContext::FileInfoSet::FileInfoSet() {}
 IsolatedContext::FileInfoSet::~FileInfoSet() {}
 
 bool IsolatedContext::FileInfoSet::AddPath(
     const FilePath& path, std::string* registered_name) {
   // The given path should not contain any '..' and should be absolute.
   if (path.ReferencesParent() || !path.IsAbsolute())
     return false;
   FilePath::StringType name = GetRegisterNameForPath(path);
   std::string utf8name = FilePath(name).AsUTF8Unsafe();
   FilePath normalized_path = path.NormalizePathSeparators();
-  bool inserted = fileset_.insert(FileInfo(utf8name, normalized_path)).second;
+  bool inserted =
+      fileset_.insert(MountPointInfo(utf8name, normalized_path)).second;
   if (!inserted) {
     int suffix = 1;
     std::string basepart = FilePath(name).RemoveExtension().AsUTF8Unsafe();
     std::string ext = FilePath(FilePath(name).Extension()).AsUTF8Unsafe();
     while (!inserted) {
       utf8name = base::StringPrintf("%s (%d)", basepart.c_str(), suffix++);
       if (!ext.empty())
         utf8name.append(ext);
-      inserted = fileset_.insert(FileInfo(utf8name, normalized_path)).second;
+      inserted =
+          fileset_.insert(MountPointInfo(utf8name, normalized_path)).second;
     }
   }
   if (registered_name)
     *registered_name = utf8name;
   return true;
 }
 
 bool IsolatedContext::FileInfoSet::AddPathWithName(
     const FilePath& path, const std::string& name) {
   // The given path should not contain any '..' and should be absolute.
   if (path.ReferencesParent() || !path.IsAbsolute())
     return false;
-  return fileset_.insert(FileInfo(name, path.NormalizePathSeparators())).second;
+  return fileset_.insert(
+      MountPointInfo(name, path.NormalizePathSeparators())).second;
 }
 
 //--------------------------------------------------------------------------
 
 class IsolatedContext::Instance {
  public:
-  typedef FileSystemType MountType;
-
   // For a single-path isolated file system, which could be registered by
   // IsolatedContext::RegisterFileSystemForPath().
   // Most of isolated file system contexts should be of this type.
-  Instance(FileSystemType type, const FileInfo& file_info);
+  Instance(FileSystemType type, const MountPointInfo& file_info);
 
   // For a multi-paths isolated file system.  As of writing only file system
   // type which could have multi-paths is Dragged file system, and
   // could be registered by IsolatedContext::RegisterDraggedFileSystem().
-  Instance(FileSystemType type, const std::set<FileInfo>& files);
-
-  // For a single-path external file system.
-  Instance(FileSystemType type, const FilePath& path);
+  Instance(FileSystemType type, const std::set<MountPointInfo>& files);
 
   ~Instance();
 
-  MountType mount_type() const { return mount_type_; }
   FileSystemType type() const { return type_; }
-  const FileInfo& file_info() const { return file_info_; }
-  const std::set<FileInfo>& files() const { return files_; }
+  const MountPointInfo& file_info() const { return file_info_; }
+  const std::set<MountPointInfo>& files() const { return files_; }
   int ref_counts() const { return ref_counts_; }
 
   void AddRef() { ++ref_counts_; }
   void RemoveRef() { --ref_counts_; }
 
   bool ResolvePathForName(const std::string& name, FilePath* path) const;
 
   // Returns true if the instance is a single-path instance.
   bool IsSinglePathInstance() const;
 
  private:
-  const MountType mount_type_;
   const FileSystemType type_;
 
   // For single-path instance.
-  const FileInfo file_info_;
+  const MountPointInfo file_info_;
 
   // For multiple-path instance (e.g. dragged file system).
-  const std::set<FileInfo> files_;
+  const std::set<MountPointInfo> files_;
 
   // Reference counts. Note that an isolated filesystem is created with ref==0
   // and will get deleted when the ref count reaches <=0.
   int ref_counts_;
 
   DISALLOW_COPY_AND_ASSIGN(Instance);
 };
 
 IsolatedContext::Instance::Instance(FileSystemType type,
-                                    const FileInfo& file_info)
-    : mount_type_(kFileSystemTypeIsolated),
-      type_(type),
+                                    const MountPointInfo& file_info)
+    : type_(type),
       file_info_(file_info),
       ref_counts_(0) {
   DCHECK(IsSinglePathIsolatedFileSystem(type_));
 }
 
 IsolatedContext::Instance::Instance(FileSystemType type,
-                                    const std::set<FileInfo>& files)
-    : mount_type_(kFileSystemTypeIsolated),
-      type_(type),
+                                    const std::set<MountPointInfo>& files)
+    : type_(type),
       files_(files),
       ref_counts_(0) {
   DCHECK(!IsSinglePathIsolatedFileSystem(type_));
 }
 
-IsolatedContext::Instance::Instance(FileSystemType type,
-                                    const FilePath& path)
-    : mount_type_(kFileSystemTypeExternal),
-      type_(type),
-      file_info_(FileInfo("", path)),
-      ref_counts_(0) {
-  DCHECK(IsSinglePathIsolatedFileSystem(type_));
-}
-
 IsolatedContext::Instance::~Instance() {}
 
 bool IsolatedContext::Instance::ResolvePathForName(const std::string& name,
                                                    FilePath* path) const {
   if (IsSinglePathIsolatedFileSystem(type_)) {
     *path = file_info_.path;
     return file_info_.name == name;
   }
-  std::set<FileInfo>::const_iterator found = files_.find(
-      FileInfo(name, FilePath()));
+  std::set<MountPointInfo>::const_iterator found = files_.find(
+      MountPointInfo(name, FilePath()));
   if (found == files_.end())
     return false;
   *path = found->path;
   return true;
 }
 
 bool IsolatedContext::Instance::IsSinglePathInstance() const {
   return IsSinglePathIsolatedFileSystem(type_);
 }
 
@@ skipping 28 matching lines @@
   if (register_name && !register_name->empty()) {
     name = *register_name;
   } else {
     name = FilePath(GetRegisterNameForPath(path)).AsUTF8Unsafe();
     if (register_name)
       register_name->assign(name);
   }
 
   base::AutoLock locker(lock_);
   std::string filesystem_id = GetNewFileSystemId();
-  instance_map_[filesystem_id] = new Instance(type, FileInfo(name, path));
+  instance_map_[filesystem_id] = new Instance(type, MountPointInfo(name, path));
   path_to_id_map_[path].insert(filesystem_id);
   return filesystem_id;
 }
 
-bool IsolatedContext::RegisterExternalFileSystem(const std::string& mount_name,
-                                                 FileSystemType type,
-                                                 const FilePath& path) {
-  base::AutoLock locker(lock_);
-  IDToInstance::iterator found = instance_map_.find(mount_name);
-  if (found != instance_map_.end())
-    return false;
-  instance_map_[mount_name] = new Instance(type, path);
-  path_to_id_map_[path].insert(mount_name);
-  return true;
-}
-
-std::vector<IsolatedContext::FileInfo>
-IsolatedContext::GetExternalMountPoints() const {
-  base::AutoLock locker(lock_);
-  std::vector<FileInfo> files;
-  for (IDToInstance::const_iterator iter = instance_map_.begin();
-       iter != instance_map_.end();
-       ++iter) {
-    if (iter->second->mount_type() == kFileSystemTypeExternal)
-      files.push_back(FileInfo(iter->first, iter->second->file_info().path));
-  }
-  return files;
-}
-
 bool IsolatedContext::RevokeFileSystem(const std::string& filesystem_id) {
   base::AutoLock locker(lock_);
   return UnregisterFileSystem(filesystem_id);
 }
 
-void IsolatedContext::RevokeFileSystemByPath(const FilePath& path_in) {
+bool IsolatedContext::GetRegisteredPath(
+    const std::string& filesystem_id, FilePath* path) const {
+  DCHECK(path);
   base::AutoLock locker(lock_);
-  FilePath path(path_in.NormalizePathSeparators());
-  PathToID::iterator ids_iter = path_to_id_map_.find(path);
-  if (ids_iter == path_to_id_map_.end())
-    return;
-  std::set<std::string>& ids = ids_iter->second;
-  for (std::set<std::string>::iterator iter = ids.begin();
-       iter != ids.end(); ++iter) {
-    IDToInstance::iterator found = instance_map_.find(*iter);
-    if (found != instance_map_.end()) {
-      delete found->second;
-      instance_map_.erase(found);
-    }
-  }
-  path_to_id_map_.erase(ids_iter);
+  IDToInstance::const_iterator found = instance_map_.find(filesystem_id);
+  if (found == instance_map_.end() || !found->second->IsSinglePathInstance())
+    return false;
+  *path = found->second->file_info().path;
+  return true;
 }
 
-void IsolatedContext::AddReference(const std::string& filesystem_id) {
-  base::AutoLock locker(lock_);
-  DCHECK(instance_map_.find(filesystem_id) != instance_map_.end());
-  instance_map_[filesystem_id]->AddRef();
-}
-
-void IsolatedContext::RemoveReference(const std::string& filesystem_id) {
-  base::AutoLock locker(lock_);
-  // This could get called for non-existent filesystem if it has been
-  // already deleted by RevokeFileSystemByPath.
-  IDToInstance::iterator found = instance_map_.find(filesystem_id);
-  if (found == instance_map_.end())
-    return;
-  Instance* instance = found->second;
-  DCHECK_GT(instance->ref_counts(), 0);
-  instance->RemoveRef();
-  if (instance->ref_counts() == 0 &&
-      instance->mount_type() != kFileSystemTypeExternal) {
-    bool deleted = UnregisterFileSystem(filesystem_id);
-    DCHECK(deleted);
-  }
-}
-
-bool IsolatedContext::CrackIsolatedPath(const FilePath& virtual_path,
+bool IsolatedContext::CrackVirtualPath(const FilePath& virtual_path,
                                         std::string* id_or_name,
                                         FileSystemType* type,
                                         FilePath* path) const {
   DCHECK(id_or_name);
   DCHECK(path);
 
   // This should not contain any '..' references.
   if (virtual_path.ReferencesParent())
     return false;
 
@@ skipping 11 matching lines @@
   FilePath cracked_path;
   {
     base::AutoLock locker(lock_);
     IDToInstance::const_iterator found_instance = instance_map_.find(fsid);
     if (found_instance == instance_map_.end())
       return false;
     *id_or_name = fsid;
     const Instance* instance = found_instance->second;
     if (type)
       *type = instance->type();
-    switch (instance->mount_type()) {
-      case kFileSystemTypeIsolated: {
-        if (component_iter == components.end()) {
-          // The virtual root case.
-          path->clear();
-          return true;
-        }
-        // *component_iter should be a name of the registered path.
-        std::string name = FilePath(*component_iter++).AsUTF8Unsafe();
-        if (!instance->ResolvePathForName(name, &cracked_path))
-          return false;
-        break;
-      }
-      case kFileSystemTypeExternal:
-        cracked_path = instance->file_info().path;
-        break;
-      default:
-        NOTREACHED();
-        break;
+
+    if (component_iter == components.end()) {
+      // The virtual root case.
+      path->clear();
+      return true;
     }
+
+    // *component_iter should be a name of the registered path.
+    std::string name = FilePath(*component_iter++).AsUTF8Unsafe();
+    if (!instance->ResolvePathForName(name, &cracked_path))
+      return false;
   }
 
   for (; component_iter != components.end(); ++component_iter)
     cracked_path = cracked_path.Append(*component_iter);
   *path = cracked_path;
   return true;
 }
 
+void IsolatedContext::RevokeFileSystemByPath(const FilePath& path_in) {
+  base::AutoLock locker(lock_);
+  FilePath path(path_in.NormalizePathSeparators());
+  PathToID::iterator ids_iter = path_to_id_map_.find(path);
+  if (ids_iter == path_to_id_map_.end())
+    return;
+  std::set<std::string>& ids = ids_iter->second;
+  for (std::set<std::string>::iterator iter = ids.begin();
+       iter != ids.end(); ++iter) {
+    IDToInstance::iterator found = instance_map_.find(*iter);
+    if (found != instance_map_.end()) {
+      delete found->second;
+      instance_map_.erase(found);
+    }
+  }
+  path_to_id_map_.erase(ids_iter);
+}
+
+void IsolatedContext::AddReference(const std::string& filesystem_id) {
+  base::AutoLock locker(lock_);
+  DCHECK(instance_map_.find(filesystem_id) != instance_map_.end());
+  instance_map_[filesystem_id]->AddRef();
+}
+
+void IsolatedContext::RemoveReference(const std::string& filesystem_id) {
+  base::AutoLock locker(lock_);
+  // This could get called for non-existent filesystem if it has been
+  // already deleted by RevokeFileSystemByPath.
+  IDToInstance::iterator found = instance_map_.find(filesystem_id);
+  if (found == instance_map_.end())
+    return;
+  Instance* instance = found->second;
+  DCHECK_GT(instance->ref_counts(), 0);
+  instance->RemoveRef();
+  if (instance->ref_counts() == 0) {
+    bool deleted = UnregisterFileSystem(filesystem_id);
+    DCHECK(deleted);
+  }
+}
+
 bool IsolatedContext::GetDraggedFileInfo(
-    const std::string& filesystem_id, std::vector<FileInfo>* files) const {
+    const std::string& filesystem_id,
+    std::vector<MountPointInfo>* files) const {
   DCHECK(files);
   base::AutoLock locker(lock_);
   IDToInstance::const_iterator found = instance_map_.find(filesystem_id);
   if (found == instance_map_.end() ||
       found->second->type() != kFileSystemTypeDragged)
     return false;
   files->assign(found->second->files().begin(),
                 found->second->files().end());
   return true;
 }
 
-bool IsolatedContext::GetRegisteredPath(
-    const std::string& filesystem_id, FilePath* path) const {
-  DCHECK(path);
-  base::AutoLock locker(lock_);
-  IDToInstance::const_iterator found = instance_map_.find(filesystem_id);
-  if (found == instance_map_.end() || !found->second->IsSinglePathInstance())
-    return false;
-  *path = found->second->file_info().path;
-  return true;
-}
-
 FilePath IsolatedContext::CreateVirtualRootPath(
     const std::string& filesystem_id) const {
   return FilePath().AppendASCII(filesystem_id);
 }
 
 IsolatedContext::IsolatedContext() {
 }
 
 IsolatedContext::~IsolatedContext() {
   STLDeleteContainerPairSecondPointers(instance_map_.begin(),
@@ skipping 24 matching lines @@
   lock_.AssertAcquired();
   uint32 random_data[4];
   std::string id;
   do {
     base::RandBytes(random_data, sizeof(random_data));
     id = base::HexEncode(random_data, sizeof(random_data));
   } while (instance_map_.find(id) != instance_map_.end());
   return id;
 }
 
-ScopedExternalFileSystem::ScopedExternalFileSystem(
-    const std::string& mount_name,
-    FileSystemType type,
-    const FilePath& path)
-    : mount_name_(mount_name) {
-  IsolatedContext::GetInstance()->RegisterExternalFileSystem(
-      mount_name, type, path);
-}
-
-FilePath ScopedExternalFileSystem::GetVirtualRootPath() const {
-  return IsolatedContext::GetInstance()->CreateVirtualRootPath(mount_name_);
-}
-
-ScopedExternalFileSystem::~ScopedExternalFileSystem() {
-  IsolatedContext::GetInstance()->RevokeFileSystem(mount_name_);
-}
-
 }  // namespace fileapi