various scraper fixes

assets/js/upload.js

@@ -20,6 +20,7 @@ function setupImageUpload() {
   const [ fileField, remoteUrl, scraperError ] = $$('.js-scraper', form);
   const [ sourceEl, tagsEl, descrEl ] = $$('.js-image-input', form);
   const fetchButton = $('#js-scraper-preview');
+  if (!fetchButton) return;
 
   function showImages(images) {
     clearEl(imgPreviews);

lib/philomena/scrapers.ex

@@ -2,7 +2,7 @@ defmodule Philomena.Scrapers do
   @scrapers [
     Philomena.Scrapers.Deviantart,
     Philomena.Scrapers.Twitter,
-    #Philomena.Scrapers.Tumblr, # blocked on benoitc/hackney#566
+    Philomena.Scrapers.Tumblr,
     Philomena.Scrapers.Raw
   ]
 

lib/philomena/scrapers/deviantart.ex

@@ -23,7 +23,7 @@ defmodule Philomena.Scrapers.Deviantart do
   # artists give you.
   def scrape(_uri, url) do
     url
-    |> Philomena.Http.get!([], follow_redirect: true, max_redirect: 2)
+    |> follow_redirect(2)
     |> extract_data!()
     |> try_intermediary_hires!()
     |> try_new_hires!()
@@ -132,4 +132,21 @@ defmodule Philomena.Scrapers.Deviantart do
         data
     end
   end
+
+  # Workaround for benoitc/hackney#273
+  defp follow_redirect(_url, 0), do: nil
+  defp follow_redirect(url, max_times) do
+    case Philomena.Http.get!(url) do
+      %HTTPoison.Response{headers: headers, status_code: code} when code in [301, 302] ->
+        location = Enum.find_value(headers, &location_header/1)
+        follow_redirect(location, max_times - 1)
+
+      response ->
+        response
+    end
+  end
+
+  defp location_header({"Location", location}), do: location
+  defp location_header({"location", location}), do: location
+  defp location_header(_), do: nil
 end

lib/philomena/scrapers/twitter.ex

@@ -17,7 +17,7 @@ defmodule Philomena.Scrapers.Twitter do
   defp extract_data(tweet) do
     images =
       tweet["entities"]["media"]
-      |> Enum.map(&%{url: &1["media_url_https"], camo_url: Camo.Image.image_url(&1["media_url_https"])})
+      |> Enum.map(&%{url: &1["media_url_https"] <> ":orig", camo_url: Camo.Image.image_url(&1["media_url_https"])})
 
     %{
       source_url: tweet["url"],

lib/philomena_web/plugs/scraper_plug.ex

@@ -2,7 +2,13 @@ defmodule PhilomenaWeb.ScraperPlug do
   def init(opts), do: opts
 
   def call(conn, opts) do
+    params_name = Keyword.get(opts, :params_name, "image")
+    params_key = Keyword.get(opts, :params_key, "image")
+
     case conn.params do
+      %{^params_name => %{^params_key => %Plug.Upload{}}} ->
+        conn
+
       %{"scraper_cache" => url} ->
         Philomena.Http.get!(url, [], max_body_length: 30_000_000)
         |> maybe_fixup_params(opts, conn)