1 files changed, 83 insertions, 0 deletions
diff --git a/parser/feed/src/main/java/de/danoeh/antennapod/parser/feed/util/MimeTypeUtils.java b/parser/feed/src/main/java/de/danoeh/antennapod/parser/feed/util/MimeTypeUtils.java
new file mode 100644
index 000000000..be1048050
--- /dev/null
+++ b/parser/feed/src/main/java/de/danoeh/antennapod/parser/feed/util/MimeTypeUtils.java
@@ -0,0 +1,83 @@
+package de.danoeh.antennapod.parser.feed.util;
+
+import android.webkit.MimeTypeMap;
+import androidx.annotation.Nullable;
+import org.apache.commons.io.FilenameUtils;
+
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * Utility class for handling MIME-Types of enclosures.
+ * */
+public class MimeTypeUtils {
+    public static final String OCTET_STREAM = "application/octet-stream";
+
+    // based on https://developer.android.com/guide/topics/media/media-formats
+    static final Set<String> AUDIO_FILE_EXTENSIONS = new HashSet<>(Arrays.asList(
+            "3gp", "aac", "amr", "flac", "imy", "m4a", "mid", "mkv", "mp3", "mp4", "mxmf", "oga",
+            "ogg", "ogx", "opus", "ota", "rtttl", "rtx", "wav", "xmf"
+    ));
+
+    static final Set<String> VIDEO_FILE_EXTENSIONS = new HashSet<>(Arrays.asList(
+            "3gp", "mkv", "mp4", "ogg", "ogv", "ogx", "webm"
+    ));
+
+    private MimeTypeUtils() {
+
+    }
+
+    @Nullable
+    public static String getMimeType(@Nullable String type, @Nullable String filename) {
+        if (isMediaFile(type) && !OCTET_STREAM.equals(type)) {
+            return type;
+        }
+        String filenameType = MimeTypeUtils.getMimeTypeFromUrl(filename);
+        if (isMediaFile(filenameType)) {
+            return filenameType;
+        }
+        return type;
+    }
+
+    public static boolean isMediaFile(String type) {
+        if (type == null) {
+            return false;
+        } else {
+            return type.startsWith("audio/")
+                    || type.startsWith("video/")
+                    || type.equals("application/ogg")
+                    || type.equals("application/octet-stream");
+        }
+    }
+
+    public static boolean isImageFile(String type) {
+        if (type == null) {
+            return false;
+        } else {
+            return type.startsWith("image/");
+        }
+    }
+
+    /**
+     * Should be used if mime-type of enclosure tag is not supported. This
+     * method will return the mime-type of the file extension.
+     */
+    private static String getMimeTypeFromUrl(String url) {
+        if (url == null) {
+            return null;
+        }
+        String extension = FilenameUtils.getExtension(url);
+        String mapResult = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
+        if (mapResult != null) {
+            return mapResult;
+        }
+
+        if (AUDIO_FILE_EXTENSIONS.contains(extension)) {
+            return "audio/*";
+        } else if (VIDEO_FILE_EXTENSIONS.contains(extension)) {
+            return "video/*";
+        }
+        return null;
+    }
+}