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package de.thedevstack.conversationsplus.utils;
import android.graphics.Bitmap;
import android.net.Uri;
import android.util.Base64;
import android.util.Base64OutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.security.DigestOutputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import de.thedevstack.android.logcat.Logging;
import de.thedevstack.conversationsplus.ConversationsPlusApplication;
import eu.siacs.conversations.Config;
import eu.siacs.conversations.utils.CryptoHelper;
import eu.siacs.conversations.xmpp.pep.Avatar;
/**
* This util provides access to saved avatars, creating avatars.
*/
public final class AvatarUtil {
/**
* Get the PEP Avatar.
* TODO: Why PEP Avatar?
* @param image the uri to the avatar's image
* @param size the image width/height to resize to
* @param format the format for the avatar
* @return the avatar
*/
public static Avatar getPepAvatar(Uri image, int size, Bitmap.CompressFormat format) {
try {
Avatar avatar = new Avatar();
Bitmap bm = ImageUtil.cropCenterSquare(image, size);
if (bm == null) {
return null;
}
ByteArrayOutputStream mByteArrayOutputStream = new ByteArrayOutputStream();
Base64OutputStream mBase64OutputSttream = new Base64OutputStream(
mByteArrayOutputStream, Base64.DEFAULT);
MessageDigest digest = MessageDigest.getInstance("SHA-1");
DigestOutputStream mDigestOutputStream = new DigestOutputStream(
mBase64OutputSttream, digest);
if (!bm.compress(format, 75, mDigestOutputStream)) {
return null;
}
mDigestOutputStream.flush();
mDigestOutputStream.close();
avatar.sha1sum = CryptoHelper.bytesToHex(digest.digest());
avatar.image = new String(mByteArrayOutputStream.toByteArray());
return avatar;
} catch (NoSuchAlgorithmException e) {
return null;
} catch (IOException e) {
return null;
}
}
/**
* Returns whether the avatar is cached or not.
* @param avatar the avatar to check the existance
* @return <code>true</code> if the file of the avatar exists, <code>false</code> otherwise
*/
public static boolean isAvatarCached(Avatar avatar) {
File file = new File(getAvatarPath(avatar.getFilename()));
return file.exists();
}
/**
* Saves an avatar to the file system.
* All exceptions are silently ignored.
* TODO: Move real saving operation to FileBackend
* @param avatar the avatar to save
* @return <code>true</code> if the avatar was saved successfully, <code>false</code> otherwise.
*/
public static boolean save(Avatar avatar) {
File file;
if (isAvatarCached(avatar)) {
file = new File(getAvatarPath(avatar.getFilename()));
} else {
String filename = getAvatarPath(avatar.getFilename());
file = new File(filename + ".tmp");
file.getParentFile().mkdirs();
OutputStream os = null;
try {
file.createNewFile();
os = new FileOutputStream(file);
MessageDigest digest = MessageDigest.getInstance("SHA-1");
digest.reset();
DigestOutputStream mDigestOutputStream = new DigestOutputStream(os, digest);
mDigestOutputStream.write(avatar.getImageAsBytes());
mDigestOutputStream.flush();
mDigestOutputStream.close();
String sha1sum = CryptoHelper.bytesToHex(digest.digest());
if (sha1sum.equals(avatar.sha1sum)) {
file.renameTo(new File(filename));
} else {
Logging.d(Config.LOGTAG, "sha1sum mismatch for " + avatar.owner);
file.delete();
return false;
}
} catch (FileNotFoundException e) {
return false;
} catch (IOException e) {
return false;
} catch (NoSuchAlgorithmException e) {
return false;
} finally {
StreamUtil.close(os);
}
}
avatar.size = file.length();
return true;
}
/**
* Returns the avatar for an uri.
* @param avatar the avatar's uri
* @param size the height/width the avatar should have
* @return the bitmap of the uri
*/
public static Bitmap getAvatar(String avatar, int size) {
if (avatar == null) {
return null;
}
Bitmap bm = ImageUtil.cropCenter(getAvatarUri(avatar), size, size);
if (bm == null) {
return null;
}
return bm;
}
/**
* Returns the path to an avatar
* @param avatar the name of the avatar.
* @return the path as string
*/
public static String getAvatarPath(String avatar) {
return ConversationsPlusApplication.getInstance().getFilesDir().getAbsolutePath()+ "/avatars/" + avatar;
}
/**
* Returns the path to an avatar as an uri.
* @param avatar the name of the avatar
* @return the path as uri
*/
public static Uri getAvatarUri(String avatar) {
return Uri.parse("file:" + getAvatarPath(avatar));
}
/**
* Avoid instantiation it's an helper class.
*/
private AvatarUtil() {
// Static helper class
}
}
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