94 lines
2.7 KiB
Elixir
94 lines
2.7 KiB
Elixir
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defmodule SimpleshopThemeWeb.ImageController do
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use SimpleshopThemeWeb, :controller
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alias SimpleshopTheme.Media
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alias SimpleshopTheme.Media.SVGRecolorer
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@doc """
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Serves an image from the database by ID.
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Images are served with aggressive caching headers since they are
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immutable once uploaded.
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"""
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def show(conn, %{"id" => id}) do
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case Media.get_image(id) do
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nil ->
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send_resp(conn, 404, "Image not found")
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image ->
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conn
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|> put_resp_content_type(image.content_type)
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|> put_resp_header("cache-control", "public, max-age=31536000, immutable")
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|> put_resp_header("etag", ~s("#{image.id}"))
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|> send_resp(200, image.data)
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end
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end
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@doc """
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Serves a thumbnail of an image if available, otherwise falls back to full image.
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"""
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def thumbnail(conn, %{"id" => id}) do
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case Media.get_image(id) do
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nil ->
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send_resp(conn, 404, "Image not found")
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%{thumbnail_data: thumbnail_data} = image when not is_nil(thumbnail_data) ->
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conn
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|> put_resp_content_type("image/jpeg")
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|> put_resp_header("cache-control", "public, max-age=31536000, immutable")
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|> put_resp_header("etag", ~s("#{image.id}-thumb"))
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|> send_resp(200, thumbnail_data)
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image ->
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conn
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|> put_resp_content_type(image.content_type)
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|> put_resp_header("cache-control", "public, max-age=31536000, immutable")
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|> put_resp_header("etag", ~s("#{image.id}"))
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|> send_resp(200, image.data)
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end
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end
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@doc """
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Serves an SVG image recolored with the specified color.
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The color should be a hex color code (with or without the leading #).
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Only works with SVG images.
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"""
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def recolored_svg(conn, %{"id" => id, "color" => color}) do
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clean_color = normalize_color(color)
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with true <- SVGRecolorer.valid_hex_color?(clean_color),
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%{is_svg: true, svg_content: svg} when not is_nil(svg) <- Media.get_image(id) do
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recolored = SVGRecolorer.recolor(svg, clean_color)
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conn
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|> put_resp_content_type("image/svg+xml")
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|> put_resp_header("cache-control", "public, max-age=3600")
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|> put_resp_header("etag", ~s("#{id}-#{clean_color}"))
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|> send_resp(200, recolored)
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else
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false ->
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send_resp(conn, 400, "Invalid color format")
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nil ->
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send_resp(conn, 404, "Image not found")
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%{is_svg: false} ->
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send_resp(conn, 400, "Image is not an SVG")
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%{svg_content: nil} ->
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send_resp(conn, 400, "SVG content not available")
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end
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end
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defp normalize_color(color) do
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color = String.trim(color)
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if String.starts_with?(color, "#") do
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color
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else
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"#" <> color
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end
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end
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end
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