src/com/android/documentsui/archives/WriteableArchive.java - LeafOS-Project/android_packages_apps_DocumentsUI - Gitiles

 /*
  * Copyright (C) 2017 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 package com.android.documentsui.archives;

 import android.content.Context;
 import android.net.Uri;
 import android.os.CancellationSignal;
 import android.os.OperationCanceledException;
 import android.os.ParcelFileDescriptor.AutoCloseOutputStream;
 import android.os.ParcelFileDescriptor;
 import android.provider.DocumentsContract.Document;
 import android.support.annotation.Nullable;
 import android.util.Log;

 import com.android.internal.annotations.GuardedBy;
 import android.support.annotation.VisibleForTesting;

 import libcore.io.IoUtils;

 import java.io.FileDescriptor;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.RejectedExecutionException;
 import java.util.concurrent.TimeUnit;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipOutputStream;

 /**
  * Provides basic implementation for creating archives.
  *
  * <p>This class is thread safe.
  */
 public class WriteableArchive extends Archive {
     private static final String TAG = "WriteableArchive";

     @GuardedBy("mEntries")
     private final Set<String> mPendingEntries = new HashSet<>();
     private final ExecutorService mExecutor = Executors.newSingleThreadExecutor();
     @GuardedBy("mEntries")
     private final ZipOutputStream mZipOutputStream;
     private final AutoCloseOutputStream mOutputStream;

     /**
      * Takes ownership of the passed file descriptor.
      */
     private WriteableArchive(
             Context context,
             ParcelFileDescriptor fd,
             Uri archiveUri,
             int accessMode,
             @Nullable Uri notificationUri)
             throws IOException {
         super(context, archiveUri, accessMode, notificationUri);
         if (!supportsAccessMode(accessMode)) {
             throw new IllegalStateException("Unsupported access mode.");
         }

         addEntry(null /* no parent */, new ZipEntry("/"));  // Root entry.
         mOutputStream = new AutoCloseOutputStream(fd);
         mZipOutputStream = new ZipOutputStream(mOutputStream);
     }

     private void addEntry(@Nullable ZipEntry parentEntry, ZipEntry entry) {
         final String entryPath = getEntryPath(entry);
         synchronized (mEntries) {
             if (entry.isDirectory()) {
                 if (!mTree.containsKey(entryPath)) {
                     mTree.put(entryPath, new ArrayList<ZipEntry>());
                 }
             }
             mEntries.put(entryPath, entry);
             if (parentEntry != null) {
                 mTree.get(getEntryPath(parentEntry)).add(entry);
             }
         }
     }

     /**
      * @see ParcelFileDescriptor
      */
     public static boolean supportsAccessMode(int accessMode) {
         return accessMode == ParcelFileDescriptor.MODE_WRITE_ONLY;
     }

     /**
      * Creates a DocumentsArchive instance for writing into an archive file passed
      * as a file descriptor.
      *
      * This method takes ownership for the passed descriptor. The caller must
      * not use it after passing.
      *
      * @param context Context of the provider.
      * @param descriptor File descriptor for the archive's contents.
      * @param archiveUri Uri of the archive document.
      * @param accessMode Access mode for the archive {@see ParcelFileDescriptor}.
      * @param Uri notificationUri Uri for notifying that the archive file has changed.
      */
     @VisibleForTesting
     public static WriteableArchive createForParcelFileDescriptor(
             Context context, ParcelFileDescriptor descriptor, Uri archiveUri, int accessMode,
             @Nullable Uri notificationUri)
             throws IOException {
         try {
             return new WriteableArchive(context, descriptor, archiveUri, accessMode,
                     notificationUri);
         } catch (Exception e) {
             // Since the method takes ownership of the passed descriptor, close it
             // on exception.
             IoUtils.closeQuietly(descriptor);
             throw e;
         }
     }

     @Override
     @VisibleForTesting
     public String createDocument(String parentDocumentId, String mimeType, String displayName)
             throws FileNotFoundException {
         final ArchiveId parsedParentId = ArchiveId.fromDocumentId(parentDocumentId);
         MorePreconditions.checkArgumentEquals(mArchiveUri, parsedParentId.mArchiveUri,
                 "Mismatching archive Uri. Expected: %s, actual: %s.");

         final boolean isDirectory = Document.MIME_TYPE_DIR.equals(mimeType);
         ZipEntry entry;
         String entryPath;

         synchronized (mEntries) {
             final ZipEntry parentEntry = mEntries.get(parsedParentId.mPath);

             if (parentEntry == null) {
                 throw new FileNotFoundException();
             }

             if (displayName.indexOf("/") != -1 || ".".equals(displayName) || "..".equals(displayName)) {
                 throw new IllegalStateException("Display name contains invalid characters.");
             }

             if ("".equals(displayName)) {
                 throw new IllegalStateException("Display name cannot be empty.");
             }


             assert(parentEntry.getName().endsWith("/"));
             final String parentName = "/".equals(parentEntry.getName()) ? "" : parentEntry.getName();
             final String entryName = parentName + displayName + (isDirectory ? "/" : "");
             entry = new ZipEntry(entryName);
             entryPath = getEntryPath(entry);
             entry.setSize(0);

             if (mEntries.get(entryPath) != null) {
                 throw new IllegalStateException("The document already exist: " + entryPath);
             }
             addEntry(parentEntry, entry);
         }

         if (!isDirectory) {
             // For files, the contents will be written via openDocument. Since the contents
             // must be immediately followed by the contents, defer adding the header until
             // openDocument. All pending entires which haven't been written will be added
             // to the ZIP file in close().
             synchronized (mEntries) {
                 mPendingEntries.add(entryPath);
             }
         } else {
             try {
                 synchronized (mEntries) {
                     mZipOutputStream.putNextEntry(entry);
                 }
             } catch (IOException e) {
                 throw new IllegalStateException(
                         "Failed to create a file in the archive: " + entryPath, e);
             }
         }

         return createArchiveId(entryPath).toDocumentId();
     }

     @Override
     public ParcelFileDescriptor openDocument(
             String documentId, String mode, @Nullable final CancellationSignal signal)
             throws FileNotFoundException {
         MorePreconditions.checkArgumentEquals("w", mode,
                 "Invalid mode. Only writing \"w\" supported, but got: \"%s\".");
         final ArchiveId parsedId = ArchiveId.fromDocumentId(documentId);
         MorePreconditions.checkArgumentEquals(mArchiveUri, parsedId.mArchiveUri,
                 "Mismatching archive Uri. Expected: %s, actual: %s.");

         final ZipEntry entry;
         synchronized (mEntries) {
             entry = mEntries.get(parsedId.mPath);
             if (entry == null) {
                 throw new FileNotFoundException();
             }

             if (!mPendingEntries.contains(parsedId.mPath)) {
                 throw new IllegalStateException("Files can be written only once.");
             }
             mPendingEntries.remove(parsedId.mPath);
         }

         ParcelFileDescriptor[] pipe;
         try {
             pipe = ParcelFileDescriptor.createReliablePipe();
         } catch (IOException e) {
             // Ideally we'd simply throw IOException to the caller, but for consistency
             // with DocumentsProvider::openDocument, converting it to IllegalStateException.
             throw new IllegalStateException("Failed to open the document.", e);
         }
         final ParcelFileDescriptor inputPipe = pipe[0];

         try {
             mExecutor.execute(
                     new Runnable() {
                         @Override
                         public void run() {
                             try (final ParcelFileDescriptor.AutoCloseInputStream inputStream =
                                     new ParcelFileDescriptor.AutoCloseInputStream(inputPipe)) {
                                 try {
                                     synchronized (mEntries) {
                                         mZipOutputStream.putNextEntry(entry);
                                         final byte buffer[] = new byte[32 * 1024];
                                         int bytes;
                                         long size = 0;
                                         while ((bytes = inputStream.read(buffer)) != -1) {
                                             if (signal != null) {
                                                 signal.throwIfCanceled();
                                             }
                                             mZipOutputStream.write(buffer, 0, bytes);
                                             size += bytes;
                                         }
                                         entry.setSize(size);
                                         mZipOutputStream.closeEntry();
                                     }
                                 } catch (IOException e) {
                                     // Catch the exception before the outer try-with-resource closes
                                     // the pipe with close() instead of closeWithError().
                                     try {
                                         Log.e(TAG, "Failed while writing to a file.", e);
                                         inputPipe.closeWithError("Writing failure.");
                                     } catch (IOException e2) {
                                         Log.e(TAG, "Failed to close the pipe after an error.", e2);
                                     }
                                 }
                             } catch (OperationCanceledException e) {
                                 // Cancelled gracefully.
                             } catch (IOException e) {
                                 // Input stream auto-close error. Close quietly.
                             }
                         }
                     });
         } catch (RejectedExecutionException e) {
             IoUtils.closeQuietly(pipe[0]);
             IoUtils.closeQuietly(pipe[1]);
             throw new IllegalStateException("Failed to initialize pipe.");
         }

         return pipe[1];
     }

     /**
      * Closes the archive. Blocks until all enqueued pipes are completed.
      */
     @Override
     public void close() {
         // Waits until all enqueued pipe requests are completed.
         mExecutor.shutdown();
         try {
             final boolean result = mExecutor.awaitTermination(
                     Long.MAX_VALUE, TimeUnit.MILLISECONDS);
             assert(result);
         } catch (InterruptedException e) {
             Log.e(TAG, "Opened files failed to be fullly written.", e);
         }

         // Flush all pending entries. They will all have empty size.
         synchronized (mEntries) {
             for (final String path : mPendingEntries) {
                 try {
                     mZipOutputStream.putNextEntry(mEntries.get(path));
                     mZipOutputStream.closeEntry();
                 } catch (IOException e) {
                     Log.e(TAG, "Failed to flush empty entries.", e);
                 }
             }

             try {
                 mZipOutputStream.close();
             } catch (IOException e) {
                 Log.e(TAG, "Failed while closing the ZIP file.", e);
             }
         }

         IoUtils.closeQuietly(mOutputStream);
     }
 };
	/*
	* Copyright (C) 2017 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	package com.android.documentsui.archives;

	import android.content.Context;
	import android.net.Uri;
	import android.os.CancellationSignal;
	import android.os.OperationCanceledException;
	import android.os.ParcelFileDescriptor.AutoCloseOutputStream;
	import android.os.ParcelFileDescriptor;
	import android.provider.DocumentsContract.Document;
	import android.support.annotation.Nullable;
	import android.util.Log;

	import com.android.internal.annotations.GuardedBy;
	import android.support.annotation.VisibleForTesting;

	import libcore.io.IoUtils;

	import java.io.FileDescriptor;
	import java.io.FileNotFoundException;
	import java.io.FileOutputStream;
	import java.io.IOException;
	import java.io.InputStream;
	import java.util.ArrayList;
	import java.util.HashSet;
	import java.util.List;
	import java.util.Set;
	import java.util.concurrent.ExecutorService;
	import java.util.concurrent.Executors;
	import java.util.concurrent.RejectedExecutionException;
	import java.util.concurrent.TimeUnit;
	import java.util.zip.ZipEntry;
	import java.util.zip.ZipOutputStream;

	/**
	* Provides basic implementation for creating archives.
	*
	* <p>This class is thread safe.
	*/
	public class WriteableArchive extends Archive {
	private static final String TAG = "WriteableArchive";

	@GuardedBy("mEntries")
	private final Set<String> mPendingEntries = new HashSet<>();
	private final ExecutorService mExecutor = Executors.newSingleThreadExecutor();
	@GuardedBy("mEntries")
	private final ZipOutputStream mZipOutputStream;
	private final AutoCloseOutputStream mOutputStream;

	/**
	* Takes ownership of the passed file descriptor.
	*/
	private WriteableArchive(
	Context context,
	ParcelFileDescriptor fd,
	Uri archiveUri,
	int accessMode,
	@Nullable Uri notificationUri)
	throws IOException {
	super(context, archiveUri, accessMode, notificationUri);
	if (!supportsAccessMode(accessMode)) {
	throw new IllegalStateException("Unsupported access mode.");
	}

	addEntry(null /* no parent */, new ZipEntry("/")); // Root entry.
	mOutputStream = new AutoCloseOutputStream(fd);
	mZipOutputStream = new ZipOutputStream(mOutputStream);
	}

	private void addEntry(@Nullable ZipEntry parentEntry, ZipEntry entry) {
	final String entryPath = getEntryPath(entry);
	synchronized (mEntries) {
	if (entry.isDirectory()) {
	if (!mTree.containsKey(entryPath)) {
	mTree.put(entryPath, new ArrayList<ZipEntry>());
	}
	}
	mEntries.put(entryPath, entry);
	if (parentEntry != null) {
	mTree.get(getEntryPath(parentEntry)).add(entry);
	}
	}
	}

	/**
	* @see ParcelFileDescriptor
	*/
	public static boolean supportsAccessMode(int accessMode) {
	return accessMode == ParcelFileDescriptor.MODE_WRITE_ONLY;
	}

	/**
	* Creates a DocumentsArchive instance for writing into an archive file passed
	* as a file descriptor.
	*
	* This method takes ownership for the passed descriptor. The caller must
	* not use it after passing.
	*
	* @param context Context of the provider.
	* @param descriptor File descriptor for the archive's contents.
	* @param archiveUri Uri of the archive document.
	* @param accessMode Access mode for the archive {@see ParcelFileDescriptor}.
	* @param Uri notificationUri Uri for notifying that the archive file has changed.
	*/
	@VisibleForTesting
	public static WriteableArchive createForParcelFileDescriptor(
	Context context, ParcelFileDescriptor descriptor, Uri archiveUri, int accessMode,
	@Nullable Uri notificationUri)
	throws IOException {
	try {
	return new WriteableArchive(context, descriptor, archiveUri, accessMode,
	notificationUri);
	} catch (Exception e) {
	// Since the method takes ownership of the passed descriptor, close it
	// on exception.
	IoUtils.closeQuietly(descriptor);
	throw e;
	}
	}

	@Override
	@VisibleForTesting
	public String createDocument(String parentDocumentId, String mimeType, String displayName)
	throws FileNotFoundException {
	final ArchiveId parsedParentId = ArchiveId.fromDocumentId(parentDocumentId);
	MorePreconditions.checkArgumentEquals(mArchiveUri, parsedParentId.mArchiveUri,
	"Mismatching archive Uri. Expected: %s, actual: %s.");

	final boolean isDirectory = Document.MIME_TYPE_DIR.equals(mimeType);
	ZipEntry entry;
	String entryPath;

	synchronized (mEntries) {
	final ZipEntry parentEntry = mEntries.get(parsedParentId.mPath);

	if (parentEntry == null) {
	throw new FileNotFoundException();
	}

	if (displayName.indexOf("/") != -1 \|\| ".".equals(displayName) \|\| "..".equals(displayName)) {
	throw new IllegalStateException("Display name contains invalid characters.");
	}

	if ("".equals(displayName)) {
	throw new IllegalStateException("Display name cannot be empty.");
	}


	assert(parentEntry.getName().endsWith("/"));
	final String parentName = "/".equals(parentEntry.getName()) ? "" : parentEntry.getName();
	final String entryName = parentName + displayName + (isDirectory ? "/" : "");
	entry = new ZipEntry(entryName);
	entryPath = getEntryPath(entry);
	entry.setSize(0);

	if (mEntries.get(entryPath) != null) {
	throw new IllegalStateException("The document already exist: " + entryPath);
	}
	addEntry(parentEntry, entry);
	}

	if (!isDirectory) {
	// For files, the contents will be written via openDocument. Since the contents
	// must be immediately followed by the contents, defer adding the header until
	// openDocument. All pending entires which haven't been written will be added
	// to the ZIP file in close().
	synchronized (mEntries) {
	mPendingEntries.add(entryPath);
	}
	} else {
	try {
	synchronized (mEntries) {
	mZipOutputStream.putNextEntry(entry);
	}
	} catch (IOException e) {
	throw new IllegalStateException(
	"Failed to create a file in the archive: " + entryPath, e);
	}
	}

	return createArchiveId(entryPath).toDocumentId();
	}

	@Override
	public ParcelFileDescriptor openDocument(
	String documentId, String mode, @Nullable final CancellationSignal signal)
	throws FileNotFoundException {
	MorePreconditions.checkArgumentEquals("w", mode,
	"Invalid mode. Only writing \"w\" supported, but got: \"%s\".");
	final ArchiveId parsedId = ArchiveId.fromDocumentId(documentId);
	MorePreconditions.checkArgumentEquals(mArchiveUri, parsedId.mArchiveUri,
	"Mismatching archive Uri. Expected: %s, actual: %s.");

	final ZipEntry entry;
	synchronized (mEntries) {
	entry = mEntries.get(parsedId.mPath);
	if (entry == null) {
	throw new FileNotFoundException();
	}

	if (!mPendingEntries.contains(parsedId.mPath)) {
	throw new IllegalStateException("Files can be written only once.");
	}
	mPendingEntries.remove(parsedId.mPath);
	}

	ParcelFileDescriptor[] pipe;
	try {
	pipe = ParcelFileDescriptor.createReliablePipe();
	} catch (IOException e) {
	// Ideally we'd simply throw IOException to the caller, but for consistency
	// with DocumentsProvider::openDocument, converting it to IllegalStateException.
	throw new IllegalStateException("Failed to open the document.", e);
	}
	final ParcelFileDescriptor inputPipe = pipe[0];

	try {
	mExecutor.execute(
	new Runnable() {
	@Override
	public void run() {
	try (final ParcelFileDescriptor.AutoCloseInputStream inputStream =
	new ParcelFileDescriptor.AutoCloseInputStream(inputPipe)) {
	try {
	synchronized (mEntries) {
	mZipOutputStream.putNextEntry(entry);
	final byte buffer[] = new byte[32 * 1024];
	int bytes;
	long size = 0;
	while ((bytes = inputStream.read(buffer)) != -1) {
	if (signal != null) {
	signal.throwIfCanceled();
	}
	mZipOutputStream.write(buffer, 0, bytes);
	size += bytes;
	}
	entry.setSize(size);
	mZipOutputStream.closeEntry();
	}
	} catch (IOException e) {
	// Catch the exception before the outer try-with-resource closes
	// the pipe with close() instead of closeWithError().
	try {
	Log.e(TAG, "Failed while writing to a file.", e);
	inputPipe.closeWithError("Writing failure.");
	} catch (IOException e2) {
	Log.e(TAG, "Failed to close the pipe after an error.", e2);
	}
	}
	} catch (OperationCanceledException e) {
	// Cancelled gracefully.
	} catch (IOException e) {
	// Input stream auto-close error. Close quietly.
	}
	}
	});
	} catch (RejectedExecutionException e) {
	IoUtils.closeQuietly(pipe[0]);
	IoUtils.closeQuietly(pipe[1]);
	throw new IllegalStateException("Failed to initialize pipe.");
	}

	return pipe[1];
	}

	/**
	* Closes the archive. Blocks until all enqueued pipes are completed.
	*/
	@Override
	public void close() {
	// Waits until all enqueued pipe requests are completed.
	mExecutor.shutdown();
	try {
	final boolean result = mExecutor.awaitTermination(
	Long.MAX_VALUE, TimeUnit.MILLISECONDS);
	assert(result);
	} catch (InterruptedException e) {
	Log.e(TAG, "Opened files failed to be fullly written.", e);
	}

	// Flush all pending entries. They will all have empty size.
	synchronized (mEntries) {
	for (final String path : mPendingEntries) {
	try {
	mZipOutputStream.putNextEntry(mEntries.get(path));
	mZipOutputStream.closeEntry();
	} catch (IOException e) {
	Log.e(TAG, "Failed to flush empty entries.", e);
	}
	}

	try {
	mZipOutputStream.close();
	} catch (IOException e) {
	Log.e(TAG, "Failed while closing the ZIP file.", e);
	}
	}

	IoUtils.closeQuietly(mOutputStream);
	}
	};