switch to maintained twitter scraper implementation (#187)

lib/philomena/scrapers/twitter.ex

@@ -1,78 +1,27 @@
 defmodule Philomena.Scrapers.Twitter do
   @url_regex ~r|\Ahttps?://(?:mobile\.)?twitter.com/([A-Za-z\d_]+)/status/([\d]+)/?|
-  @script_regex ~r|="(https://abs.twimg.com/responsive-web/client-web(?:-legacy)?/main\.[\da-z]+\.js)"|
-  @bearer_regex ~r|"(AAAAAAAAAAAAA[^"]*)"|
-  @activate_url "https://api.twitter.com/1.1/guest/activate.json"
 
   @spec can_handle?(URI.t(), String.t()) :: true | false
   def can_handle?(_uri, url) do
     String.match?(url, @url_regex)
   end
 
   def scrape(_uri, url) do
-    api_response!(url)
-    |> extract_data()
-  end
-
-  defp extract_data(tweet) do
-    images =
-      tweet["entities"]["media"]
-      |> Enum.map(
-        &%{
-          url: &1["media_url_https"] <> "?format=jpg&name=4096x4096",
-          camo_url: Camo.Image.image_url(&1["media_url_https"])
-        }
-      )
-
-    %{
-      source_url: tweet["url"],
-      author_name: tweet["user"],
-      description: tweet["text"] || tweet["full_text"],
-      images: images
-    }
-  end
-
-  # We'd like to use the API anonymously. In order to do this, we need to
-  # extract the anonymous bearer token. Fortunately, this is pretty easy
-  # to identify in the minified mobile script source.
-  def api_response!(url) do
     [user, status_id] = Regex.run(@url_regex, url, capture: :all_but_first)
 
-    page_url = "https://twitter.com/#{user}/status/#{status_id}"
-
-    api_url =
-      "https://api.twitter.com/2/timeline/conversation/#{status_id}.json?tweet_mode=extended"
-
-    url = "https://twitter.com/#{user}/status/#{status_id}"
+    image_url = "https://d.fxtwitter.com/#{user}/status/#{status_id}.jpg"
 
-    {gt, bearer} =
-      Philomena.Http.get(page_url)
-      |> extract_guest_token_and_bearer()
+    {:ok, %Tesla.Env{status: 200}} = Philomena.Http.head(image_url)
 
-    {:ok, api_resp} =
-      Philomena.Http.get(api_url, [{"Authorization", "Bearer #{bearer}"}, {"x-guest-token", gt}])
-
-    api_resp
-    |> Map.get(:body)
-    |> Jason.decode!()
-    |> Map.get("globalObjects")
-    |> Map.get("tweets")
-    |> Map.get(status_id)
-    |> Map.put("user", user)
-    |> Map.put("url", url)
-  end
-
-  defp extract_guest_token_and_bearer({:ok, %Tesla.Env{body: page}}) do
-    [script | _] = Regex.run(@script_regex, page, capture: :all_but_first)
-    {:ok, %{body: body}} = Philomena.Http.get(script)
-
-    [bearer] = Regex.run(@bearer_regex, body, capture: :all_but_first)
-
-    {:ok, %{body: body}} =
-      Philomena.Http.post(@activate_url, nil, [{"Authorization", "Bearer #{bearer}"}])
-
-    gt = Map.fetch!(Jason.decode!(body), "guest_token")
-
-    {gt, bearer}
+    %{
+      source_url: "https://twitter.com/#{user}/status/#{status_id}",
+      author_name: user,
+      images: [
+        %{
+          url: image_url,
+          camo_url: Camo.Image.image_url(image_url),
+        },
+      ]
+    }
   end
 end