Claudio Ortolina
67 lines
1.4 KiB
Elixir
67 lines
1.4 KiB
Elixir
defmodule MusicLibrary.Assets.Asset do
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use Ecto.Schema
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import Ecto.Changeset
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alias Vix.Vips.Image
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@primary_key {:hash, :string, autogenerate: false}
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schema "assets" do
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field :content, :binary
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field :format, :string
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field :properties, :map, default: %{}, read_after_writes: true
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timestamps(type: :utc_datetime)
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end
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def changeset(asset, attrs) do
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asset
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|> cast(attrs, [:content, :format, :properties])
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|> validate_required([:content, :format])
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|> generate_hash()
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|> unique_constraint(:hash)
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end
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def image_changeset(asset, attrs) do
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asset
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|> cast(attrs, [:content, :format])
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|> validate_required([:content, :format])
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|> generate_hash()
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|> generate_properties()
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|> unique_constraint(:hash)
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end
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defp generate_hash(changeset) do
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case get_change(changeset, :content) do
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nil ->
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changeset
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content ->
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put_change(changeset, :hash, hash(content))
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end
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end
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defp generate_properties(changeset) do
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case get_change(changeset, :content) do
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nil ->
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changeset
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content ->
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put_change(changeset, :properties, get_image_properties(content))
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end
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end
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defp get_image_properties(content) do
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{:ok, image} = Image.new_from_buffer(content)
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%{
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"width" => Image.width(image),
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"height" => Image.height(image)
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}
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end
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def hash(content) do
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:crypto.hash(:sha256, content) |> Base.encode16()
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end
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end
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