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108 lines
3.3 KiB
Elixir
108 lines
3.3 KiB
Elixir
defmodule PhilomenaProxy.Scrapers.Deviantart do
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@moduledoc false
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alias PhilomenaProxy.Scrapers.Scraper
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alias PhilomenaProxy.Scrapers
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@behaviour Scraper
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@image_regex ~r|data-rh="true" rel="preload" href="([^"]*)" as="image"|
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@source_regex ~r|rel="canonical" href="([^"]*)"|
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@artist_regex ~r|https://www.deviantart.com/([^/]*)/art|
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@cdnint_regex ~r|(https://images-wixmp-[0-9a-f]+.wixmp.com)(?:/intermediary)?/f/([^/]*)/([^/?]*)|
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@png_regex ~r|(https://[0-9a-z\-\.]+(?:/intermediary)?/f/[0-9a-f\-]+/[0-9a-z\-]+\.png/v1/fill/[0-9a-z_,]+/[0-9a-z_\-]+)(\.png)(.*)|
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@jpg_regex ~r|(https://[0-9a-z\-\.]+(?:/intermediary)?/f/[0-9a-f\-]+/[0-9a-z\-]+\.jpg/v1/fill/w_[0-9]+,h_[0-9]+,q_)([0-9]+)(,[a-z]+\/[a-z0-6_\-]+\.jpe?g.*)|
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@spec can_handle?(URI.t(), String.t()) :: boolean()
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def can_handle?(uri, _url) do
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String.ends_with?(uri.host, "deviantart.com")
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end
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# https://github.com/DeviantArt/DeviantArt-API/issues/153
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#
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# Note that Erlang (and by extension Elixir) do not have any sort of
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# reliable HTML/XML parsers that can accept untrusted input. As an example,
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# xmerl is vulnerable to almost every XML attack which has ever been
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# created, and also exposes the runtime to symbol DoS as an added bonus.
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#
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# So, regex it is. Eat dirt, deviantart. You don't deserve the respect
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# artists give you.
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@spec scrape(URI.t(), Scrapers.url()) :: Scrapers.scrape_result()
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def scrape(_uri, url) do
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url
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|> PhilomenaProxy.Http.get()
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|> extract_data!()
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|> try_intermediary_hires!()
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|> try_new_hires!()
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end
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defp extract_data!({:ok, %{body: body, status: 200}}) do
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[image] = Regex.run(@image_regex, body, capture: :all_but_first)
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[source] = Regex.run(@source_regex, body, capture: :all_but_first)
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[artist] = Regex.run(@artist_regex, source, capture: :all_but_first)
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%{
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source_url: source,
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author_name: artist,
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description: "",
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images: [
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%{
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url: image,
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camo_url: PhilomenaProxy.Camo.image_url(image)
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}
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]
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}
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end
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defp try_intermediary_hires!(%{images: [image]} = data) do
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with [domain, object_uuid, object_name] <-
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Regex.run(@cdnint_regex, image.url, capture: :all_but_first),
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built_url <- "#{domain}/intermediary/f/#{object_uuid}/#{object_name}",
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{:ok, %{status: 200}} <- PhilomenaProxy.Http.head(built_url) do
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# This is the high resolution URL.
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%{
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data
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| images: [
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%{
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url: built_url,
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camo_url: image.camo_url
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}
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]
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}
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else
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_ ->
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# Nothing to be found here, move along...
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data
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end
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end
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defp try_new_hires!(%{images: [image]} = data) do
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cond do
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String.match?(image.url, @png_regex) ->
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%{
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data
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| images: [
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%{
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url: String.replace(image.url, @png_regex, "\\1.png\\3"),
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camo_url: image.camo_url
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}
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]
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}
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String.match?(image.url, @jpg_regex) ->
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%{
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data
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| images: [
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%{
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url: String.replace(image.url, @jpg_regex, "\\g{1}100\\3"),
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camo_url: image.camo_url
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}
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]
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}
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true ->
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# Nothing to be found here, move along...
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data
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end
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end
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end
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