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      1 /*
      2  * Copyright (C) 2010 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "modules/filesystem/DOMFileSystemSync.h"
     33 
     34 #include "bindings/v8/ExceptionState.h"
     35 #include "core/dom/ExceptionCode.h"
     36 #include "core/fileapi/File.h"
     37 #include "core/fileapi/FileError.h"
     38 #include "modules/filesystem/DOMFilePath.h"
     39 #include "modules/filesystem/DirectoryEntrySync.h"
     40 #include "modules/filesystem/ErrorCallback.h"
     41 #include "modules/filesystem/FileEntrySync.h"
     42 #include "modules/filesystem/FileSystemCallbacks.h"
     43 #include "modules/filesystem/FileWriterBaseCallback.h"
     44 #include "modules/filesystem/FileWriterSync.h"
     45 #include "platform/FileMetadata.h"
     46 #include "public/platform/WebFileSystem.h"
     47 #include "public/platform/WebFileSystemCallbacks.h"
     48 
     49 namespace WebCore {
     50 
     51 class FileWriterBase;
     52 
     53 DOMFileSystemSync* DOMFileSystemSync::create(DOMFileSystemBase* fileSystem)
     54 {
     55     return new DOMFileSystemSync(fileSystem->m_context, fileSystem->name(), fileSystem->type(), fileSystem->rootURL());
     56 }
     57 
     58 DOMFileSystemSync::DOMFileSystemSync(ExecutionContext* context, const String& name, FileSystemType type, const KURL& rootURL)
     59     : DOMFileSystemBase(context, name, type, rootURL)
     60 {
     61     ScriptWrappable::init(this);
     62 }
     63 
     64 DOMFileSystemSync::~DOMFileSystemSync()
     65 {
     66 }
     67 
     68 void DOMFileSystemSync::reportError(PassOwnPtr<ErrorCallback> errorCallback, PassRefPtrWillBeRawPtr<FileError> fileError)
     69 {
     70     errorCallback->handleEvent(fileError.get());
     71 }
     72 
     73 DirectoryEntrySync* DOMFileSystemSync::root()
     74 {
     75     return DirectoryEntrySync::create(this, DOMFilePath::root);
     76 }
     77 
     78 namespace {
     79 
     80 class CreateFileHelper FINAL : public AsyncFileSystemCallbacks {
     81 public:
     82     class CreateFileResult : public RefCountedWillBeGarbageCollected<CreateFileResult> {
     83       public:
     84         static PassRefPtrWillBeRawPtr<CreateFileResult> create()
     85         {
     86             return adoptRefWillBeNoop(new CreateFileResult());
     87         }
     88 
     89         bool m_failed;
     90         int m_code;
     91         RefPtrWillBeMember<File> m_file;
     92 
     93         void trace(Visitor* visitor)
     94         {
     95             visitor->trace(m_file);
     96         }
     97 
     98       private:
     99         CreateFileResult()
    100             : m_failed(false)
    101             , m_code(0)
    102         {
    103         }
    104 
    105 #if !ENABLE(OILPAN)
    106         ~CreateFileResult()
    107         {
    108         }
    109 #endif
    110 
    111         friend class RefCountedWillBeGarbageCollected<CreateFileResult>;
    112     };
    113 
    114     static PassOwnPtr<AsyncFileSystemCallbacks> create(PassRefPtrWillBeRawPtr<CreateFileResult> result, const String& name, const KURL& url, FileSystemType type)
    115     {
    116         return adoptPtr(static_cast<AsyncFileSystemCallbacks*>(new CreateFileHelper(result, name, url, type)));
    117     }
    118 
    119     virtual void didFail(int code) OVERRIDE
    120     {
    121         m_result->m_failed = true;
    122         m_result->m_code = code;
    123     }
    124 
    125     virtual ~CreateFileHelper()
    126     {
    127     }
    128 
    129     virtual void didCreateSnapshotFile(const FileMetadata& metadata, PassRefPtr<BlobDataHandle> snapshot) OVERRIDE
    130     {
    131         // We can't directly use the snapshot blob data handle because the content type on it hasn't been set.
    132         // The |snapshot| param is here to provide a a chain of custody thru thread bridging that is held onto until
    133         // *after* we've coined a File with a new handle that has the correct type set on it. This allows the
    134         // blob storage system to track when a temp file can and can't be safely deleted.
    135 
    136         // For regular filesystem types (temporary or persistent), we should not cache file metadata as it could change File semantics.
    137         // For other filesystem types (which could be platform-specific ones), there's a chance that the files are on remote filesystem.
    138         // If the port has returned metadata just pass it to File constructor (so we may cache the metadata).
    139         // FIXME: We should use the snapshot metadata for all files.
    140         // https://www.w3.org/Bugs/Public/show_bug.cgi?id=17746
    141         if (m_type == FileSystemTypeTemporary || m_type == FileSystemTypePersistent) {
    142             m_result->m_file = File::createWithName(metadata.platformPath, m_name);
    143         } else if (!metadata.platformPath.isEmpty()) {
    144             // If the platformPath in the returned metadata is given, we create a File object for the path.
    145             m_result->m_file = File::createForFileSystemFile(m_name, metadata).get();
    146         } else {
    147             // Otherwise create a File from the FileSystem URL.
    148             m_result->m_file = File::createForFileSystemFile(m_url, metadata).get();
    149         }
    150     }
    151 
    152     virtual bool shouldBlockUntilCompletion() const OVERRIDE
    153     {
    154         return true;
    155     }
    156 
    157 private:
    158     CreateFileHelper(PassRefPtrWillBeRawPtr<CreateFileResult> result, const String& name, const KURL& url, FileSystemType type)
    159         : m_result(result)
    160         , m_name(name)
    161         , m_url(url)
    162         , m_type(type)
    163     {
    164     }
    165 
    166     RefPtrWillBePersistent<CreateFileResult> m_result;
    167     String m_name;
    168     KURL m_url;
    169     FileSystemType m_type;
    170 };
    171 
    172 } // namespace
    173 
    174 PassRefPtrWillBeRawPtr<File> DOMFileSystemSync::createFile(const FileEntrySync* fileEntry, ExceptionState& exceptionState)
    175 {
    176     KURL fileSystemURL = createFileSystemURL(fileEntry);
    177     RefPtrWillBeRawPtr<CreateFileHelper::CreateFileResult> result(CreateFileHelper::CreateFileResult::create());
    178     fileSystem()->createSnapshotFileAndReadMetadata(fileSystemURL, CreateFileHelper::create(result, fileEntry->name(), fileSystemURL, type()));
    179     if (result->m_failed) {
    180         exceptionState.throwDOMException(result->m_code, "Could not create '" + fileEntry->name() + "'.");
    181         return nullptr;
    182     }
    183     return result->m_file.get();
    184 }
    185 
    186 namespace {
    187 
    188 class ReceiveFileWriterCallback FINAL : public FileWriterBaseCallback {
    189 public:
    190     static PassOwnPtr<ReceiveFileWriterCallback> create()
    191     {
    192         return adoptPtr(new ReceiveFileWriterCallback());
    193     }
    194 
    195     virtual void handleEvent(FileWriterBase*) OVERRIDE
    196     {
    197     }
    198 
    199 private:
    200     ReceiveFileWriterCallback()
    201     {
    202     }
    203 };
    204 
    205 class LocalErrorCallback FINAL : public ErrorCallback {
    206 public:
    207     static PassOwnPtr<LocalErrorCallback> create(FileError::ErrorCode& errorCode)
    208     {
    209         return adoptPtr(new LocalErrorCallback(errorCode));
    210     }
    211 
    212     virtual void handleEvent(FileError* error) OVERRIDE
    213     {
    214         ASSERT(error->code() != FileError::OK);
    215         m_errorCode = error->code();
    216     }
    217 
    218 private:
    219     explicit LocalErrorCallback(FileError::ErrorCode& errorCode)
    220         : m_errorCode(errorCode)
    221     {
    222     }
    223 
    224     FileError::ErrorCode& m_errorCode;
    225 };
    226 
    227 }
    228 
    229 FileWriterSync* DOMFileSystemSync::createWriter(const FileEntrySync* fileEntry, ExceptionState& exceptionState)
    230 {
    231     ASSERT(fileEntry);
    232 
    233     FileWriterSync* fileWriter = FileWriterSync::create();
    234     OwnPtr<ReceiveFileWriterCallback> successCallback = ReceiveFileWriterCallback::create();
    235     FileError::ErrorCode errorCode = FileError::OK;
    236     OwnPtr<LocalErrorCallback> errorCallback = LocalErrorCallback::create(errorCode);
    237 
    238     OwnPtr<AsyncFileSystemCallbacks> callbacks = FileWriterBaseCallbacks::create(fileWriter, successCallback.release(), errorCallback.release(), m_context);
    239     callbacks->setShouldBlockUntilCompletion(true);
    240 
    241     fileSystem()->createFileWriter(createFileSystemURL(fileEntry), fileWriter, callbacks.release());
    242     if (errorCode != FileError::OK) {
    243         FileError::throwDOMException(exceptionState, errorCode);
    244         return 0;
    245     }
    246     return fileWriter;
    247 }
    248 
    249 }
    250