add routes /gh/:user_id/{thumbnail,channel} (#33)

lib/algora/accounts.ex

@@ -65,7 +65,7 @@ defmodule Algora.Accounts do
   Registers a user from their GithHub information.
   """
   def register_github_user(primary_email, info, emails, token) do
-    if user = get_user_by_provider(:github, primary_email) do
+    if user = get_user_by_provider_email(:github, primary_email) do
       update_github_token(user, token)
     else
       info
@@ -74,7 +74,7 @@ defmodule Algora.Accounts do
     end
   end
 
-  def get_user_by_provider(provider, email) when provider in [:github] do
+  def get_user_by_provider_email(provider, email) when provider in [:github] do
     query =
       from(u in User,
         join: i in assoc(u, :identities),
@@ -86,6 +86,16 @@ defmodule Algora.Accounts do
     Repo.one(query)
   end
 
+  def get_user_by_provider_id(provider, id) when provider in [:github] do
+    query =
+      from(u in User,
+        join: i in assoc(u, :identities),
+        where: i.provider == ^to_string(provider) and i.provider_id == ^id
+      )
+
+    Repo.one(query)
+  end
+
   def change_settings(%User{} = user, attrs) do
     User.settings_changeset(user, attrs)
   end

lib/algora_web/controllers/github_controller.ex

@@ -0,0 +1,46 @@
+defmodule AlgoraWeb.GithubController do
+  use AlgoraWeb, :controller
+
+  alias Algora.{Accounts, Library}
+
+  def get_thumbnail(conn, %{"user_id" => user_id}) do
+    with {:ok, user} <- get_user(user_id),
+         {:ok, video} <- get_latest_video(user) do
+      redirect(conn, external: get_thumbnail_url(video))
+    else
+      {:error, :video_not_found} -> redirect(conn, to: ~p"/images/og/default.png")
+      _ -> put_status(conn, :not_found)
+    end
+  end
+
+  def get_channel(conn, %{"user_id" => user_id}) do
+    case get_user(user_id) do
+      {:ok, user} ->
+        redirect(conn, to: ~p"/#{user.handle}")
+
+      _ ->
+        put_status(conn, :not_found)
+    end
+  end
+
+  defp get_user(id) do
+    case Accounts.get_user_by_provider_id(:github, id) do
+      nil -> {:error, :user_not_found}
+      user -> {:ok, user}
+    end
+  end
+
+  defp get_latest_video(user) do
+    case Library.get_latest_video(user) do
+      nil -> {:error, :video_not_found}
+      user -> {:ok, user}
+    end
+  end
+
+  defp get_thumbnail_url(video) do
+    case video.thumbnail_url do
+      nil -> ~p"/images/og/default.png"
+      url -> url
+    end
+  end
+end

lib/algora_web/router.ex

@@ -86,6 +86,9 @@ defmodule AlgoraWeb.Router do
       live "/og/cossgpt", COSSGPTOGLive, :index
       live "/:channel_handle", ChannelLive, :show
       live "/:channel_handle/:video_id", VideoLive, :show
+
+      get "/gh/:user_id/thumbnail", GithubController, :get_thumbnail
+      get "/gh/:user_id/channel", GithubController, :get_channel
     end
   end
 end