From 1668e4187ee1c1432e9af7b71bb266be60ca72e1 Mon Sep 17 00:00:00 2001
From: Samantaz Fox <coding@samantaz.fr>
Date: Mon, 7 Feb 2022 00:37:47 +0100
Subject: [PATCH 1/2] Related channel may contain a continuation entry

---
 src/invidious/channels/about.cr         | 31 ++++++++++++++++++-------
 src/invidious/routes/api/v1/channels.cr |  8 +++++--
 2 files changed, 28 insertions(+), 11 deletions(-)

diff --git a/src/invidious/channels/about.cr b/src/invidious/channels/about.cr
index 0f3928f5..4f82a0f1 100644
--- a/src/invidious/channels/about.cr
+++ b/src/invidious/channels/about.cr
@@ -140,19 +140,32 @@ def fetch_related_channels(about_channel : AboutChannel) : Array(AboutRelatedCha
 
   return [] of AboutRelatedChannel if tab.nil?
 
-  items = tab.dig?("tabRenderer", "content", "sectionListRenderer", "contents", 0, "itemSectionRenderer", "contents", 0, "gridRenderer", "items").try(&.as_a?) || [] of JSON::Any
-
-  items.map do |item|
-    related_id = item.dig("gridChannelRenderer", "channelId").as_s
-    related_title = item.dig("gridChannelRenderer", "title", "simpleText").as_s
-    related_author_url = item.dig("gridChannelRenderer", "navigationEndpoint", "browseEndpoint", "canonicalBaseUrl").as_s
-    related_author_thumbnail = item.dig("gridChannelRenderer", "thumbnail", "thumbnails", -1, "url").as_s
-
-    AboutRelatedChannel.new(
+  items = tab.dig?(
+    "tabRenderer", "content",
+    "sectionListRenderer", "contents", 0,
+    "itemSectionRenderer", "contents", 0,
+    "gridRenderer", "items"
+  ).try &.as_a?
+
+  related = [] of AboutRelatedChannel
+  return related if (items.nil? || items.empty?)
+
+  items.each do |item|
+    renderer = item["gridChannelRenderer"]?
+    next if !renderer
+
+    related_id = renderer.dig("channelId").as_s
+    related_title = renderer.dig("title", "simpleText").as_s
+    related_author_url = renderer.dig("navigationEndpoint", "browseEndpoint", "canonicalBaseUrl").as_s
+    related_author_thumbnail = HelperExtractors.get_thumbnails(renderer)
+
+    related << AboutRelatedChannel.new(
       ucid: related_id,
       author: related_title,
       author_url: related_author_url,
       author_thumbnail: related_author_thumbnail,
     )
   end
+
+  return related
 end
diff --git a/src/invidious/routes/api/v1/channels.cr b/src/invidious/routes/api/v1/channels.cr
index 3e55b412..83c6db04 100644
--- a/src/invidious/routes/api/v1/channels.cr
+++ b/src/invidious/routes/api/v1/channels.cr
@@ -96,7 +96,10 @@ module Invidious::Routes::API::V1::Channels
 
         json.field "relatedChannels" do
           json.array do
-            fetch_related_channels(channel).each do |related_channel|
+            # Fetch related channels
+            related_channels = fetch_related_channels(channel)
+
+            related_channels.each do |related_channel|
               json.object do
                 json.field "author", related_channel.author
                 json.field "authorId", related_channel.ucid
@@ -118,7 +121,8 @@ module Invidious::Routes::API::V1::Channels
               end
             end
           end
-        end
+        end # relatedChannels
+
       end
     end
   end

From 698a6f38863c399b50cda27b5b509be2980e8a21 Mon Sep 17 00:00:00 2001
From: Samantaz Fox <coding@samantaz.fr>
Date: Mon, 7 Feb 2022 00:52:18 +0100
Subject: [PATCH 2/2] API: handle related channels parsing exceptions

---
 src/invidious/routes/api/v1/channels.cr | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/invidious/routes/api/v1/channels.cr b/src/invidious/routes/api/v1/channels.cr
index 83c6db04..c4d6643a 100644
--- a/src/invidious/routes/api/v1/channels.cr
+++ b/src/invidious/routes/api/v1/channels.cr
@@ -97,7 +97,11 @@ module Invidious::Routes::API::V1::Channels
         json.field "relatedChannels" do
           json.array do
             # Fetch related channels
-            related_channels = fetch_related_channels(channel)
+            begin
+              related_channels = fetch_related_channels(channel)
+            rescue ex
+              related_channels = [] of AboutRelatedChannel
+            end
 
             related_channels.each do |related_channel|
               json.object do