media constraints model

// FREEBIE

src/org/thoughtcrime/securesms/mms/MediaConstraints.java

@@ -0,0 +1,72 @@
+package org.thoughtcrime.securesms.mms;
+
+import android.content.Context;
+import android.net.Uri;
+import android.util.Log;
+import android.util.Pair;
+
+import org.thoughtcrime.securesms.crypto.MasterSecret;
+import org.thoughtcrime.securesms.util.BitmapDecodingException;
+import org.thoughtcrime.securesms.util.BitmapUtil;
+import org.thoughtcrime.securesms.util.MediaUtil;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+import ws.com.google.android.mms.pdu.PduPart;
+
+public abstract class MediaConstraints {
+  private static final String TAG = MediaConstraints.class.getSimpleName();
+
+  public static MediaConstraints MMS_CONSTRAINTS  = new MmsMediaConstraints();
+  public static MediaConstraints PUSH_CONSTRAINTS = new PushMediaConstraints();
+
+  public abstract int getImageMaxWidth();
+  public abstract int getImageMaxHeight();
+  public abstract int getImageMaxSize();
+
+  public abstract int getVideoMaxSize();
+
+  public abstract int getAudioMaxSize();
+
+  public boolean isSatisfied(Context context, MasterSecret masterSecret, PduPart part) {
+    try {
+      return (MediaUtil.isImage(part) && part.getDataSize() <= getImageMaxSize() && isWithinBounds(context, masterSecret, part.getDataUri())) ||
+             (MediaUtil.isAudio(part) && part.getDataSize() <= getAudioMaxSize()) ||
+             (MediaUtil.isVideo(part) && part.getDataSize() <= getVideoMaxSize()) ||
+             (!MediaUtil.isImage(part) && !MediaUtil.isAudio(part) && !MediaUtil.isVideo(part));
+    } catch (IOException ioe) {
+      Log.w(TAG, "Failed to determine if media's constraints are satisfied.", ioe);
+      return false;
+    }
+  }
+
+  public boolean isWithinBounds(Context context, MasterSecret masterSecret, Uri uri) throws IOException {
+    InputStream is = PartAuthority.getPartStream(context, masterSecret, uri);
+    Pair<Integer, Integer> dimensions = BitmapUtil.getDimensions(is);
+    return dimensions.first  > 0 && dimensions.first  <= getImageMaxWidth() &&
+           dimensions.second > 0 && dimensions.second <= getImageMaxHeight();
+  }
+
+  public boolean canResize(PduPart part) {
+    return part != null && MediaUtil.isImage(part);
+  }
+
+  public byte[] getResizedMedia(Context context, MasterSecret masterSecret, PduPart part)
+      throws IOException
+  {
+    if (!canResize(part) || part.getDataUri() == null) {
+      throw new UnsupportedOperationException("Cannot resize this content type");
+    }
+
+    try {
+      return BitmapUtil.createScaledBytes(context, masterSecret, part.getDataUri(),
+                                          getImageMaxWidth(),
+                                          getImageMaxHeight(),
+                                          getImageMaxSize());
+    } catch (BitmapDecodingException bde) {
+      throw new IOException(bde);
+    }
+  }
+
+}

src/org/thoughtcrime/securesms/mms/MmsMediaConstraints.java

@@ -0,0 +1,31 @@
+package org.thoughtcrime.securesms.mms;
+
+public class MmsMediaConstraints extends MediaConstraints {
+  private static final int MAX_IMAGE_DIMEN  = 1280;
+  public  static final int MAX_MESSAGE_SIZE = 280 * 1024;
+
+  @Override
+  public int getImageMaxWidth() {
+    return MAX_IMAGE_DIMEN;
+  }
+
+  @Override
+  public int getImageMaxHeight() {
+    return MAX_IMAGE_DIMEN;
+  }
+
+  @Override
+  public int getImageMaxSize() {
+    return MAX_MESSAGE_SIZE;
+  }
+
+  @Override
+  public int getVideoMaxSize() {
+    return MAX_MESSAGE_SIZE;
+  }
+
+  @Override
+  public int getAudioMaxSize() {
+    return MAX_MESSAGE_SIZE;
+  }
+}

src/org/thoughtcrime/securesms/mms/PushMediaConstraints.java

@@ -0,0 +1,32 @@
+package org.thoughtcrime.securesms.mms;
+
+public class PushMediaConstraints extends MediaConstraints {
+  private static final int MAX_IMAGE_DIMEN  = 1280;
+  private static final int KB               = 1024;
+  private static final int MB               = 1024 * KB;
+
+  @Override
+  public int getImageMaxWidth() {
+    return MAX_IMAGE_DIMEN;
+  }
+
+  @Override
+  public int getImageMaxHeight() {
+    return MAX_IMAGE_DIMEN;
+  }
+
+  @Override
+  public int getImageMaxSize() {
+    return 300 * KB;
+  }
+
+  @Override
+  public int getVideoMaxSize() {
+    return MmsMediaConstraints.MAX_MESSAGE_SIZE;
+  }
+
+  @Override
+  public int getAudioMaxSize() {
+    return MmsMediaConstraints.MAX_MESSAGE_SIZE;
+  }
+}

src/org/thoughtcrime/securesms/mms/Slide.java

@@ -36,8 +36,6 @@ import ws.com.google.android.mms.pdu.PduPart;
 
 public abstract class Slide {
 
-  public static final int MAX_MESSAGE_SIZE = 280 * 1024;
-
   protected final PduPart      part;
   protected final Context      context;
   protected       MasterSecret masterSecret;
@@ -124,7 +122,7 @@ public abstract class Slide {
 
     while ((read = in.read(buffer)) != -1) {
       size += read;
-      if (size > MAX_MESSAGE_SIZE) throw new MediaTooLargeException("Media exceeds maximum message size.");
+      if (size > MmsMediaConstraints.MAX_MESSAGE_SIZE) throw new MediaTooLargeException("Media exceeds maximum message size.");
     }
   }
 }

src/org/thoughtcrime/securesms/mms/VideoSlide.java

@@ -75,10 +75,12 @@ public class VideoSlide extends Slide {
     return SmilUtil.createMediaElement("video", document, new String(getPart().getName()));
   }
 
-  private static PduPart constructPartFromUri(Context context, Uri uri) throws IOException, MediaTooLargeException {
-    PduPart part             = new PduPart();
+  private static PduPart constructPartFromUri(Context context, Uri uri)
+      throws IOException, MediaTooLargeException
+  {
+    PduPart         part     = new PduPart();
     ContentResolver resolver = context.getContentResolver();
-    Cursor cursor            = null;
+    Cursor          cursor   = null;
 
     try {
       cursor = resolver.query(uri, new String[] {MediaStore.Video.Media.MIME_TYPE}, null, null, null);