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1.0.0
A foundation for building Elixir Phoenix apps — SaaS, social networks, ERP systems, marketplaces, and more
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Files
lib/modules/storage/variant_naming.ex
defmodule PhoenixKit.Modules.Storage.VariantNaming do
@moduledoc """
Utilities for naming and parsing storage variant names.
Variant names follow the convention:
- Primary: `"medium"` (dimension name only)
- Alternative format: `"medium_webp"` (dimension name + format suffix)
The parser splits on the last underscore and checks whether the suffix
is a known image format. If it is, the variant is an alternative format.
"""
@known_formats ~w(jpg jpeg png webp avif gif)
@doc """
Parses a variant name into `{base_dimension, format}`.
## Examples
iex> parse_variant_name("medium")
{"medium", nil}
iex> parse_variant_name("medium_webp")
{"medium", "webp"}
iex> parse_variant_name("video_thumbnail")
{"video_thumbnail", nil}
iex> parse_variant_name("thumbnail_avif")
{"thumbnail", "avif"}
"""
def parse_variant_name(variant_name) when is_binary(variant_name) do
case String.split(variant_name, "_") do
[single] ->
{single, nil}
parts ->
suffix = List.last(parts)
if suffix in @known_formats do
base = parts |> Enum.drop(-1) |> Enum.join("_")
{base, suffix}
else
{variant_name, nil}
end
end
end
@doc """
Builds a variant name from a base dimension name and format.
## Examples
iex> variant_name("medium", nil)
"medium"
iex> variant_name("medium", "webp")
"medium_webp"
"""
def variant_name(base, nil), do: base
def variant_name(base, format), do: "#{base}_#{format}"
@doc """
Returns the list of known image format suffixes.
"""
def known_formats, do: @known_formats
@doc """
Returns the MIME type for a format string.
## Examples
iex> mime_type_for_format("webp")
"image/webp"
iex> mime_type_for_format("avif")
"image/avif"
"""
def mime_type_for_format("jpg"), do: "image/jpeg"
def mime_type_for_format("jpeg"), do: "image/jpeg"
def mime_type_for_format("png"), do: "image/png"
def mime_type_for_format("webp"), do: "image/webp"
def mime_type_for_format("avif"), do: "image/avif"
def mime_type_for_format("gif"), do: "image/gif"
def mime_type_for_format(_), do: "application/octet-stream"
end