+ end
+ end
+
+ def get_content_type(file) do
+ match =
+ File.open(file, [:read], fn f ->
+ case IO.binread(f, 8) do
+ <<0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A>> ->
+ "image/png"
+
+ <<0x47, 0x49, 0x46, 0x38, _, 0x61, _, _>> ->
+ "image/gif"
+
+ <<0xFF, 0xD8, 0xFF, _, _, _, _, _>> ->
+ "image/jpeg"
+
+ <<0x1A, 0x45, 0xDF, 0xA3, _, _, _, _>> ->
+ "video/webm"
+
+ <<0x00, 0x00, 0x00, _, 0x66, 0x74, 0x79, 0x70>> ->
+ "video/mp4"
+
+ <<0x49, 0x44, 0x33, _, _, _, _, _>> ->
+ "audio/mpeg"
+
+ <<255, 251, _, 68, 0, 0, 0, 0>> ->
+ "audio/mpeg"
+
+ <<0x4F, 0x67, 0x67, 0x53, 0x00, 0x02, 0x00, 0x00>> ->
+ case IO.binread(f, 27) do
+ <<_::size(160), 0x80, 0x74, 0x68, 0x65, 0x6F, 0x72, 0x61>> ->
+ "video/ogg"
+
+ _ ->
+ "audio/ogg"
+ end
+
+ <<0x52, 0x49, 0x46, 0x46, _, _, _, _>> ->
+ "audio/wav"
+
+ _ ->
+ "application/octet-stream"
+ end
+ end)