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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,
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     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/DOMFileSystem.h"
     33 
     34 #include "core/fileapi/File.h"
     35 #include "modules/filesystem/DOMFilePath.h"
     36 #include "modules/filesystem/DirectoryEntry.h"
     37 #include "modules/filesystem/ErrorCallback.h"
     38 #include "modules/filesystem/FileCallback.h"
     39 #include "modules/filesystem/FileEntry.h"
     40 #include "modules/filesystem/FileSystemCallbacks.h"
     41 #include "modules/filesystem/FileWriter.h"
     42 #include "modules/filesystem/FileWriterBaseCallback.h"
     43 #include "modules/filesystem/FileWriterCallback.h"
     44 #include "modules/filesystem/MetadataCallback.h"
     45 #include "platform/FileMetadata.h"
     46 #include "platform/weborigin/DatabaseIdentifier.h"
     47 #include "platform/weborigin/SecurityOrigin.h"
     48 #include "public/platform/WebFileSystem.h"
     49 #include "public/platform/WebFileSystemCallbacks.h"
     50 #include "wtf/OwnPtr.h"
     51 #include "wtf/text/StringBuilder.h"
     52 #include "wtf/text/WTFString.h"
     53 
     54 namespace WebCore {
     55 
     56 // static
     57 PassRefPtr<DOMFileSystem> DOMFileSystem::create(ExecutionContext* context, const String& name, FileSystemType type, const KURL& rootURL)
     58 {
     59     RefPtr<DOMFileSystem> fileSystem(adoptRef(new DOMFileSystem(context, name, type, rootURL)));
     60     fileSystem->suspendIfNeeded();
     61     return fileSystem.release();
     62 }
     63 
     64 PassRefPtr<DOMFileSystem> DOMFileSystem::createIsolatedFileSystem(ExecutionContext* context, const String& filesystemId)
     65 {
     66     if (filesystemId.isEmpty())
     67         return 0;
     68 
     69     StringBuilder filesystemName;
     70     filesystemName.append(createDatabaseIdentifierFromSecurityOrigin(context->securityOrigin()));
     71     filesystemName.append(":Isolated_");
     72     filesystemName.append(filesystemId);
     73 
     74     // The rootURL created here is going to be attached to each filesystem request and
     75     // is to be validated each time the request is being handled.
     76     StringBuilder rootURL;
     77     rootURL.append("filesystem:");
     78     rootURL.append(context->securityOrigin()->toString());
     79     rootURL.append("/");
     80     rootURL.append(isolatedPathPrefix);
     81     rootURL.append("/");
     82     rootURL.append(filesystemId);
     83     rootURL.append("/");
     84 
     85     return DOMFileSystem::create(context, filesystemName.toString(), FileSystemTypeIsolated, KURL(ParsedURLString, rootURL.toString()));
     86 }
     87 
     88 DOMFileSystem::DOMFileSystem(ExecutionContext* context, const String& name, FileSystemType type, const KURL& rootURL)
     89     : DOMFileSystemBase(context, name, type, rootURL)
     90     , ActiveDOMObject(context)
     91 {
     92     ScriptWrappable::init(this);
     93 }
     94 
     95 PassRefPtr<DirectoryEntry> DOMFileSystem::root()
     96 {
     97     return DirectoryEntry::create(this, DOMFilePath::root);
     98 }
     99 
    100 void DOMFileSystem::addPendingCallbacks()
    101 {
    102     setPendingActivity(this);
    103 }
    104 
    105 void DOMFileSystem::removePendingCallbacks()
    106 {
    107     unsetPendingActivity(this);
    108 }
    109 
    110 void DOMFileSystem::reportError(PassOwnPtr<ErrorCallback> errorCallback, PassRefPtr<FileError> fileError)
    111 {
    112     scheduleCallback(errorCallback, fileError);
    113 }
    114 
    115 namespace {
    116 
    117 class ConvertToFileWriterCallback : public FileWriterBaseCallback {
    118 public:
    119     static PassOwnPtr<ConvertToFileWriterCallback> create(PassOwnPtr<FileWriterCallback> callback)
    120     {
    121         return adoptPtr(new ConvertToFileWriterCallback(callback));
    122     }
    123 
    124     void handleEvent(FileWriterBase* fileWriterBase)
    125     {
    126         m_callback->handleEvent(static_cast<FileWriter*>(fileWriterBase));
    127     }
    128 private:
    129     ConvertToFileWriterCallback(PassOwnPtr<FileWriterCallback> callback)
    130         : m_callback(callback)
    131     {
    132     }
    133     OwnPtr<FileWriterCallback> m_callback;
    134 };
    135 
    136 }
    137 
    138 void DOMFileSystem::createWriter(const FileEntry* fileEntry, PassOwnPtr<FileWriterCallback> successCallback, PassOwnPtr<ErrorCallback> errorCallback)
    139 {
    140     ASSERT(fileEntry);
    141 
    142     RefPtr<FileWriter> fileWriter = FileWriter::create(executionContext());
    143     OwnPtr<FileWriterBaseCallback> conversionCallback = ConvertToFileWriterCallback::create(successCallback);
    144     OwnPtr<AsyncFileSystemCallbacks> callbacks = FileWriterBaseCallbacks::create(fileWriter, conversionCallback.release(), errorCallback);
    145     fileSystem()->createFileWriter(createFileSystemURL(fileEntry), fileWriter.get(), callbacks.release());
    146 }
    147 
    148 namespace {
    149 
    150 class SnapshotFileCallback : public FileSystemCallbacksBase {
    151 public:
    152     static PassOwnPtr<AsyncFileSystemCallbacks> create(PassRefPtr<DOMFileSystem> filesystem, const String& name, const KURL& url, PassOwnPtr<FileCallback> successCallback, PassOwnPtr<ErrorCallback> errorCallback)
    153     {
    154         return adoptPtr(static_cast<AsyncFileSystemCallbacks*>(new SnapshotFileCallback(filesystem, name, url, successCallback, errorCallback)));
    155     }
    156 
    157     virtual void didCreateSnapshotFile(const FileMetadata& metadata, PassRefPtr<BlobDataHandle> snapshot)
    158     {
    159         if (!m_successCallback)
    160             return;
    161 
    162         // We can't directly use the snapshot blob data handle because the content type on it hasn't been set.
    163         // The |snapshot| param is here to provide a a chain of custody thru thread bridging that is held onto until
    164         // *after* we've coined a File with a new handle that has the correct type set on it. This allows the
    165         // blob storage system to track when a temp file can and can't be safely deleted.
    166 
    167         // For regular filesystem types (temporary or persistent), we should not cache file metadata as it could change File semantics.
    168         // For other filesystem types (which could be platform-specific ones), there's a chance that the files are on remote filesystem. If the port has returned metadata just pass it to File constructor (so we may cache the metadata).
    169         // FIXME: We should use the snapshot metadata for all files.
    170         // https://www.w3.org/Bugs/Public/show_bug.cgi?id=17746
    171         if (m_fileSystem->type() == FileSystemTypeTemporary || m_fileSystem->type() == FileSystemTypePersistent) {
    172             m_successCallback->handleEvent(File::createWithName(metadata.platformPath, m_name).get());
    173         } else if (!metadata.platformPath.isEmpty()) {
    174             // If the platformPath in the returned metadata is given, we create a File object for the path.
    175             m_successCallback->handleEvent(File::createForFileSystemFile(m_name, metadata).get());
    176         } else {
    177             // Otherwise create a File from the FileSystem URL.
    178             m_successCallback->handleEvent(File::createForFileSystemFile(m_url, metadata).get());
    179         }
    180 
    181         m_successCallback.release();
    182     }
    183 
    184 private:
    185     SnapshotFileCallback(PassRefPtr<DOMFileSystem> filesystem, const String& name,  const KURL& url, PassOwnPtr<FileCallback> successCallback, PassOwnPtr<ErrorCallback> errorCallback)
    186         : FileSystemCallbacksBase(errorCallback, filesystem.get())
    187         , m_name(name)
    188         , m_url(url)
    189         , m_successCallback(successCallback)
    190     {
    191     }
    192 
    193     String m_name;
    194     KURL m_url;
    195     OwnPtr<FileCallback> m_successCallback;
    196 };
    197 
    198 } // namespace
    199 
    200 void DOMFileSystem::createFile(const FileEntry* fileEntry, PassOwnPtr<FileCallback> successCallback, PassOwnPtr<ErrorCallback> errorCallback)
    201 {
    202     KURL fileSystemURL = createFileSystemURL(fileEntry);
    203     fileSystem()->createSnapshotFileAndReadMetadata(fileSystemURL, SnapshotFileCallback::create(this, fileEntry->name(), fileSystemURL, successCallback, errorCallback));
    204 }
    205 
    206 } // namespace WebCore
    207