From 3131610ad8d08f3be259b8c3135ddfe80e52a8c9 Mon Sep 17 00:00:00 2001
From: Frank Hunleth <fhunleth@troodon-software.com>
Date: Sat, 10 Dec 2022 06:46:56 -0500
Subject: [PATCH] Fix error when specifying custom learn notebooks (#1570)

This fixes the following error:

```
07:18:26.178 [error] #PID<0.2236.0> running LivebookWeb.Endpoint (connection #PID<0.2226.0>, stream id 6) terminated
Server: localhost:8080 (http)
Request: GET /
** (exit) an exception was raised:
    ** (ArgumentError) expected a path starting with a single / but got "data:image/svg+xml;base64,PD94bWwgdmVyc2lv..."
        (phoenix 1.6.15) lib/phoenix/endpoint/supervisor.ex:311: Phoenix.Endpoint.Supervisor.raise_invalid_path/1
        (phoenix 1.6.15) lib/phoenix/config.ex:65: Phoenix.Config.cache/3
        (livebook 0.8.0) lib/phoenix/endpoint.ex:597: LivebookWeb.Endpoint.static_path/1
        (livebook 0.8.0) lib/livebook_web/live/learn_helpers.ex:15: anonymous fn/2 in LivebookWeb.LearnHelpers.notebook_card/1
        (livebook 0.8.0) /Users/fhunleth/git/livebook-dev/livebook/lib/livebook_web/live/home_live.ex:119: LivebookWeb.HomeLive.render/1
        (elixir 1.14.2) lib/enum.ex:1780: Enum."-map_reduce/3-lists^mapfoldl/2-0-"/3
```
---
 lib/livebook_web/live/learn_helpers.ex | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/livebook_web/live/learn_helpers.ex b/lib/livebook_web/live/learn_helpers.ex
index 2214e9be7..8a1489af8 100644
--- a/lib/livebook_web/live/learn_helpers.ex
+++ b/lib/livebook_web/live/learn_helpers.ex
@@ -12,7 +12,7 @@ defmodule LivebookWeb.LearnHelpers do
             class: "flex flex-col border-2 border-gray-100 hover:border-gray-200 rounded-2xl" do %>
       <div class="flex items-center justify-center p-6 border-b-2 border-gray-100 rounded-t-2xl h-[150px]">
         <img
-          src={Routes.static_path(@socket, @notebook_info.details.cover_url)}
+          src={img_src(@socket, @notebook_info.details.cover_url)}
           class="max-h-full max-w-[75%]"
           alt={"#{@notebook_info.title} logo"}
         />
@@ -26,4 +26,7 @@ defmodule LivebookWeb.LearnHelpers do
     <% end %>
     """
   end
+
+  defp img_src(_socket, "data:" <> _ = url), do: url
+  defp img_src(socket, url), do: Routes.static_path(socket, url)
 end