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authorsteckbrief <steckbrief@chefmail.de>2015-11-06 20:23:43 +0100
committersteckbrief <steckbrief@chefmail.de>2015-11-06 20:23:43 +0100
commit8838a5094812e0540ccfef3334e49e1a5c1a564b (patch)
tree353f4513b8f38b77fd4219c2d92a46b0f87694ff /src/main/java/de/thedevstack/conversationsplus/utils/AvatarUtil.java
parentb22d863c362bb6492240700c0f69f1a5d926f46b (diff)
FileBackend splitted into several util classes for separate concerns: AvatarUtil, StreamUtil, ImageUtil. Unused imports removed.
Diffstat (limited to 'src/main/java/de/thedevstack/conversationsplus/utils/AvatarUtil.java')
-rw-r--r--src/main/java/de/thedevstack/conversationsplus/utils/AvatarUtil.java162
1 files changed, 162 insertions, 0 deletions
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 <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 {
+ 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
+ }
+}