/*
* Copyright (C) 2008 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.email.provider;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import android.content.ContentProvider;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.MatrixCursor;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.ParcelFileDescriptor;
import android.provider.OpenableColumns;
import android.util.Config;
import android.util.Log;
import com.android.email.Account;
import com.android.email.Email;
import com.android.email.Utility;
import com.android.email.mail.internet.MimeUtility;
/*
* A simple ContentProvider that allows file access to Email's attachments.
*/
public class AttachmentProvider extends ContentProvider {
public static final Uri CONTENT_URI = Uri.parse( "content://com.android.email.attachmentprovider");
private static final String FORMAT_RAW = "RAW";
private static final String FORMAT_THUMBNAIL = "THUMBNAIL";
public static class AttachmentProviderColumns {
public static final String _ID = "_id";
public static final String DATA = "_data";
public static final String DISPLAY_NAME = "_display_name";
public static final String SIZE = "_size";
}
public static Uri getAttachmentUri(Account account, long id) {
return CONTENT_URI.buildUpon()
.appendPath(account.getUuid() + ".db")
.appendPath(Long.toString(id))
.appendPath(FORMAT_RAW)
.build();
}
public static Uri getAttachmentThumbnailUri(Account account, long id, int width, int height) {
return CONTENT_URI.buildUpon()
.appendPath(account.getUuid() + ".db")
.appendPath(Long.toString(id))
.appendPath(FORMAT_THUMBNAIL)
.appendPath(Integer.toString(width))
.appendPath(Integer.toString(height))
.build();
}
public static Uri getAttachmentUri(String db, long id) {
return CONTENT_URI.buildUpon()
.appendPath(db)
.appendPath(Long.toString(id))
.appendPath(FORMAT_RAW)
.build();
}
@Override
public boolean onCreate() {
/*
* We use the cache dir as a temporary directory (since Android doesn't give us one) so
* on startup we'll clean up any .tmp files from the last run.
*/
File[] files = getContext().getCacheDir().listFiles();
for (File file : files) {
if (file.getName().endsWith(".tmp")) {
file.delete();
}
}
return true;
}
@Override
public String getType(Uri uri) {
List<String> segments = uri.getPathSegments();
String dbName = segments.get(0);
String id = segments.get(1);
String format = segments.get(2);
if (FORMAT_THUMBNAIL.equals(format)) {
return "image/png";
}
else {
String path = getContext().getDatabasePath(dbName).getAbsolutePath();
SQLiteDatabase db = null;
Cursor cursor = null;
try {
db = SQLiteDatabase.openDatabase(path, null, 0);
cursor = db.query(
"attachments",
new String[] { "mime_type" },
"id = ?",
new String[] { id },
null,
null,
null);
cursor.moveToFirst();
String type = cursor.getString(0);
cursor.close();
db.close();
return type;
}
finally {
if (cursor != null) {
cursor.close();
}
if (db != null) {
db.close();
}
}
}
}
@Override
public ParcelFileDescriptor openFile(Uri uri, String mode) throws FileNotFoundException {
List<String> segments = uri.getPathSegments();
String dbName = segments.get(0);
String id = segments.get(1);
String format = segments.get(2);
if (FORMAT_THUMBNAIL.equals(format)) {
int width = Integer.parseInt(segments.get(3));
int height = Integer.parseInt(segments.get(4));
String filename = "thmb_" + dbName + "_" + id;
File dir = getContext().getCacheDir();
File file = new File(dir, filename);
if (!file.exists()) {
Uri attachmentUri = getAttachmentUri(dbName, Long.parseLong(id));
String type = getType(attachmentUri);
try {
FileInputStream in = new FileInputStream(
new File(getContext().getDatabasePath(dbName + "_att"), id));
Bitmap thumbnail = createThumbnail(type, in);
thumbnail = thumbnail.createScaledBitmap(thumbnail, width, height, true);
FileOutputStream out = new FileOutputStream(file);
thumbnail.compress(Bitmap.CompressFormat.PNG, 100, out);
out.close();
in.close();
}
catch (IOException ioe) {
return null;
}
}
return ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY);
}
else {
return ParcelFileDescriptor.open(
new File(getContext().getDatabasePath(dbName + "_att"), id),
ParcelFileDescriptor.MODE_READ_ONLY);
}
}
@Override
public int delete(Uri uri, String arg1, String[] arg2) {
return 0;
}
@Override
public Uri insert(Uri uri, ContentValues values) {
return null;
}
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
String sortOrder) {
if (projection == null) {
projection =
new String[] {
AttachmentProviderColumns._ID,
AttachmentProviderColumns.DATA,
};
}
List<String> segments = uri.getPathSegments();
String dbName = segments.get(0);
String id = segments.get(1);
String format = segments.get(2);
String path = getContext().getDatabasePath(dbName).getAbsolutePath();
String name = null;
int size = -1;
SQLiteDatabase db = null;
Cursor cursor = null;
try {
db = SQLiteDatabase.openDatabase(path, null, 0);
cursor = db.query(
"attachments",
new String[] { "name", "size" },
"id = ?",
new String[] { id },
null,
null,
null);
if (!cursor.moveToFirst()) {
return null;
}
name = cursor.getString(0);
size = cursor.getInt(1);
}
finally {
if (cursor != null) {
cursor.close();
}
if (db != null) {
db.close();
}
}
MatrixCursor ret = new MatrixCursor(projection);
Object[] values = new Object[projection.length];
for (int i = 0, count = projection.length; i < count; i++) {
String column = projection[i];
if (AttachmentProviderColumns._ID.equals(column)) {
values[i] = id;
}
else if (AttachmentProviderColumns.DATA.equals(column)) {
values[i] = uri.toString();
}
else if (AttachmentProviderColumns.DISPLAY_NAME.equals(column)) {
values[i] = name;
}
else if (AttachmentProviderColumns.SIZE.equals(column)) {
values[i] = size;
}
}
ret.addRow(values);
return ret;
}
@Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
return 0;
}
private Bitmap createThumbnail(String type, InputStream data) {
if(MimeUtility.mimeTypeMatches(type, "image/*")) {
return createImageThumbnail(data);
}
return null;
}
private Bitmap createImageThumbnail(InputStream data) {
try {
Bitmap bitmap = BitmapFactory.decodeStream(data);
return bitmap;
}
catch (OutOfMemoryError oome) {
/*
* Improperly downloaded images, corrupt bitmaps and the like can commonly
* cause OOME due to invalid allocation sizes. We're happy with a null bitmap in
* that case. If the system is really out of memory we'll know about it soon
* enough.
*/
return null;
}
catch (Exception e) {
return null;
}
}
}
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