From 8838a5094812e0540ccfef3334e49e1a5c1a564b Mon Sep 17 00:00:00 2001 From: steckbrief Date: Fri, 6 Nov 2015 20:23:43 +0100 Subject: FileBackend splitted into several util classes for separate concerns: AvatarUtil, StreamUtil, ImageUtil. Unused imports removed. --- .../conversationsplus/utils/AvatarUtil.java | 162 +++++++++++++++++++++ 1 file changed, 162 insertions(+) create mode 100644 src/main/java/de/thedevstack/conversationsplus/utils/AvatarUtil.java (limited to 'src/main/java/de/thedevstack/conversationsplus/utils/AvatarUtil.java') diff --git a/src/main/java/de/thedevstack/conversationsplus/utils/AvatarUtil.java b/src/main/java/de/thedevstack/conversationsplus/utils/AvatarUtil.java new file mode 100644 index 00000000..287f4b50 --- /dev/null +++ b/src/main/java/de/thedevstack/conversationsplus/utils/AvatarUtil.java @@ -0,0 +1,162 @@ +package de.thedevstack.conversationsplus.utils; + +import android.graphics.Bitmap; +import android.net.Uri; +import android.util.Base64; +import android.util.Base64OutputStream; +import android.util.Log; + +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.conversationsplus.Config; +import de.thedevstack.conversationsplus.ConversationsPlusApplication; +import de.thedevstack.conversationsplus.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 true if the file of the avatar exists, false 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 true if the avatar was saved successfully, false 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 { + Log.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 + } +} -- cgit v1.2.3