add post image uploader

lib/chiya_web/uploaders/note_image.ex

@@ -0,0 +1,63 @@
+defmodule Chiya.Uploaders.NoteImage do
+  use Waffle.Definition
+  use Waffle.Ecto.Definition
+
+  # Include ecto support (requires package waffle_ecto installed):
+  # use Waffle.Ecto.Definition
+
+  @versions [:original, :dithered, :thumb, :thumb_dithered]
+
+  # Whitelist file extensions:
+  def validate({file, _}) do
+    file_extension = file.file_name |> Path.extname() |> String.downcase()
+
+    # case Enum.member?(~w(.jpg .jpeg .gif .png), file_extension) do
+    #   true -> :ok
+    #   false -> {:error, "invalid file type"}
+    # end
+
+    # filetype will be validated in liveview
+    :ok
+  end
+
+  # Define a resize transformation:
+  def transform(:dithered, _) do
+    {:convert, "-strip -resize 1500000@ -colors 24 -dither FloydSteinberg -format png", :png}
+  end
+
+  # Define a thumbnail transformation:
+  def transform(:thumb, _) do
+    {:convert, "-strip -thumbnail 250x250^ -gravity center -extent 250x250 -format png", :png}
+  end
+
+  # Define a thumbnail transformation with dithering:
+  def transform(:thumb_dithered, _) do
+    {:convert,
+     "-strip -thumbnail 250x250^ -gravity center -extent 250x250 -colors 24 -dither FloydSteinberg -format png",
+     :png}
+  end
+
+  # Override the persisted filenames:
+  def filename(version, _) do
+    version
+  end
+
+  # Override the storage directory:
+  def storage_dir(_version, {_file, _scope}) do
+    "uploads/user/avatar"
+  end
+
+  # Provide a default URL if there hasn't been a file uploaded
+  # def default_url(version, scope) do
+  #   "/images/avatars/default_#{version}.png"
+  # end
+
+  # Specify custom headers for s3 objects
+  # Available options are [:cache_control, :content_disposition,
+  #    :content_encoding, :content_length, :content_type,
+  #    :expect, :expires, :storage_class, :website_redirect_location]
+  #
+  # def s3_object_headers(version, {file, scope}) do
+  #   [content_type: MIME.from_path(file.file_name)]
+  # end
+end