From 49ddf8b6bdb98c7a9678cbec800c45350a54a786 Mon Sep 17 00:00:00 2001
From: techmetx11 <techmetx11@disroot.org>
Date: Thu, 23 Mar 2023 05:10:21 +0000
Subject: [PATCH] Added attributed description support

---
 src/invidious/videos/description.cr | 81 +++++++++++++++++++++++++++++
 src/invidious/videos/parser.cr      |  6 ++-
 2 files changed, 85 insertions(+), 2 deletions(-)
 create mode 100644 src/invidious/videos/description.cr

diff --git a/src/invidious/videos/description.cr b/src/invidious/videos/description.cr
new file mode 100644
index 00000000..d4c60a84
--- /dev/null
+++ b/src/invidious/videos/description.cr
@@ -0,0 +1,81 @@
+require "json"
+require "uri"
+
+def parse_command(command : JSON::Any?, string : String) : String?
+  on_tap = command.dig?("onTap", "innertubeCommand")
+
+  # 3rd party URL, extract original URL from YouTube tracking URL
+  if url_endpoint = on_tap.try &.["urlEndpoint"]?
+    youtube_url = URI.parse url_endpoint["url"].as_s
+
+    original_url = youtube_url.query_params["q"]?
+    if original_url.nil?
+      return ""
+    else
+      return "<a href=\"#{original_url}\">#{original_url}</a>"
+    end
+    # 1st party watch URL
+  elsif watch_endpoint = on_tap.try &.["watchEndpoint"]?
+    video_id = watch_endpoint["videoId"].as_s
+    time = watch_endpoint["startTimeSeconds"].as_i
+
+    url = "/watch?v=#{video_id}&t=#{time}s"
+
+    # if text is a timestamp, use the string instead
+    if /(?:\d{2}:){1,2}\d{2}/ =~ string
+      return "<a href=\"#{url}\">#{string}</a>"
+    else
+      return "<a href=\"#{url}\">#{url}</a>"
+    end
+    # hashtag/other browse URLs
+  elsif browse_endpoint = on_tap.try &.dig?("commandMetadata", "webCommandMetadata")
+    url = browse_endpoint["url"].try &.as_s
+
+    # remove unnecessary character in a channel name
+    if browse_endpoint["webPageType"]?.try &.as_s == "WEB_PAGE_TYPE_CHANNEL"
+      name = string.match(/@[\w\d]+/)
+      if name.try &.[0]?
+        return "<a href=\"#{url}\">#{name.try &.[0]}</a>"
+      end
+    end
+
+    return "<a href=\"#{url}\">#{string}</a>"
+  end
+
+  return "(unknown YouTube desc command)"
+end
+
+def parse_description(desc : JSON::Any?) : String?
+  if desc.nil?
+    return ""
+  end
+
+  content = desc["content"].as_s
+  if content.empty?
+    return ""
+  end
+
+  if commands = desc["commandRuns"]?.try &.as_a
+    description = String.build do |str|
+      index = 0
+      commands.each do |command|
+        start_index = command["startIndex"].as_i
+        length = command["length"].as_i
+
+        if start_index > 0 && start_index - index > 0
+          str << content[index..(start_index - 1)]
+          index += start_index - index
+        end
+
+        str << parse_command(command, content[start_index, length])
+        index += length
+      end
+      if index < content.size
+        str << content[index..content.size]
+      end
+    end
+    return description
+  end
+
+  return content
+end
diff --git a/src/invidious/videos/parser.cr b/src/invidious/videos/parser.cr
index 608ae99d..3a342a95 100644
--- a/src/invidious/videos/parser.cr
+++ b/src/invidious/videos/parser.cr
@@ -284,8 +284,10 @@ def parse_video_info(video_id : String, player_response : Hash(String, JSON::Any
   description = microformat.dig?("description", "simpleText").try &.as_s || ""
   short_description = player_response.dig?("videoDetails", "shortDescription")
 
-  description_html = video_secondary_renderer.try &.dig?("description", "runs")
-    .try &.as_a.try { |t| content_to_comment_html(t, video_id) }
+  # description_html = video_secondary_renderer.try &.dig?("description", "runs")
+  #  .try &.as_a.try { |t| content_to_comment_html(t, video_id) }
+
+  description_html = parse_description(video_secondary_renderer.try &.dig?("attributedDescription"))
 
   # Video metadata