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/**
 * Copyright 2010-present Facebook.
 *
 * 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.facebook;

import android.content.ContentProvider;
import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;
import android.os.ParcelFileDescriptor;
import android.util.Log;
import android.util.Pair;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.UUID;

/**
 * 

Implements a * ContentProvider that can be used to provide binary attachments (e.g., images) to calls made * via @link FacebookDialog}. The {@link NativeAppCallAttachmentStore} class provides methods to attach * and clean up the attachments. * *

Note that this ContentProvider is only necessary if an application wishes to attach images, etc., that are * stored in memory and do not have another way to be referenced by a content URI. For images obtained from, * e.g., the Camera or Gallery, that already have a content URI associated with them, use of this class is not * necessary.

* *

If an application wishes to attach images that are stored in-memory within the application, this content * provider must be listed in the application's AndroidManifest.xml, and it should be named according to the * pattern "com.facebook.app.NativeAppCallContentProvider{FACEBOOK_APP_ID}". See the * {@link NativeAppCallContentProvider#getAttachmentUrl(String) getContentProviderName} method.

*/ public class NativeAppCallContentProvider extends ContentProvider { private static final String TAG = NativeAppCallContentProvider.class.getName(); private static final String ATTACHMENT_URL_BASE = "content://com.facebook.app.NativeAppCallContentProvider"; private final AttachmentDataSource dataSource; public NativeAppCallContentProvider() { this(new NativeAppCallAttachmentStore()); } NativeAppCallContentProvider(AttachmentDataSource dataSource) { this.dataSource = dataSource; } interface AttachmentDataSource { File openAttachment(UUID callId, String attachmentName) throws FileNotFoundException; } /** * Returns the name of the content provider formatted correctly for constructing URLs. * @param applicationId the Facebook application ID of the application * @return the String to use as the authority portion of a content URI. */ public static String getAttachmentUrl(String applicationId, UUID callId, String attachmentName) { return String.format("%s%s/%s/%s", ATTACHMENT_URL_BASE, applicationId, callId.toString(), attachmentName); } @Override public boolean onCreate() { return true; } @Override public Cursor query(Uri uri, String[] strings, String s, String[] strings2, String s2) { return null; } @Override public String getType(Uri uri) { return null; } @Override public Uri insert(Uri uri, ContentValues contentValues) { return null; } @Override public int delete(Uri uri, String s, String[] strings) { return 0; } @Override public int update(Uri uri, ContentValues contentValues, String s, String[] strings) { return 0; } @Override public android.os.ParcelFileDescriptor openFile(android.net.Uri uri, java.lang.String mode) throws java.io.FileNotFoundException { Pair callIdAndAttachmentName = parseCallIdAndAttachmentName(uri); if (callIdAndAttachmentName == null) { throw new FileNotFoundException(); } try { File file = dataSource.openAttachment(callIdAndAttachmentName.first, callIdAndAttachmentName.second); return ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY); } catch (FileNotFoundException exception) { Log.e(TAG, "Got unexpected exception:" + exception); throw exception; } } Pair parseCallIdAndAttachmentName(Uri uri) { try { // We don't do explicit format checking here. Malformed URIs may generate NullPointerExceptions or // array bounds exceptions, which we'll catch and return null. All of these will result in a // FileNotFoundException being thrown in openFile. String callIdAndAttachmentName = uri.getPath().substring(1); String [] parts = callIdAndAttachmentName.split("/"); String callIdString = parts[0]; String attachmentName = parts[1]; UUID callId = UUID.fromString(callIdString); return new Pair(callId, attachmentName); } catch (Exception exception) { return null; } } }




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