From 68cf24d100d55a87d57650716c589a8bdf9a2434 Mon Sep 17 00:00:00 2001
From: Omar Roth <omarroth@protonmail.com>
Date: Sun, 8 Sep 2019 12:08:59 -0400
Subject: [PATCH] Add support for channel redirects

---
 src/invidious.cr          | 48 +++++++++++++++++++++++++++++++--------
 src/invidious/channels.cr | 11 +++++++++
 src/invidious/videos.cr   |  6 ++++-
 3 files changed, 54 insertions(+), 11 deletions(-)

diff --git a/src/invidious.cr b/src/invidious.cr
index 8f7e1a63c..58ba981d5 100644
--- a/src/invidious.cr
+++ b/src/invidious.cr
@@ -391,7 +391,7 @@ get "/watch" do |env|
   begin
     video = get_video(id, PG_DB, region: params.region)
   rescue ex : VideoRedirect
-    next env.redirect "/watch?v=#{ex.message}"
+    next env.redirect env.request.resource.gsub(id, ex.video_id)
   rescue ex
     error_message = ex.message
     env.response.status_code = 500
@@ -668,7 +668,7 @@ get "/embed/:id" do |env|
   begin
     video = get_video(id, PG_DB, region: params.region)
   rescue ex : VideoRedirect
-    next env.redirect "/embed/#{ex.message}"
+    next env.redirect env.request.resource.gsub(id, ex.video_id)
   rescue ex
     error_message = ex.message
     env.response.status_code = 500
@@ -2632,6 +2632,8 @@ get "/feed/channel/:ucid" do |env|
 
   begin
     channel = get_about_info(ucid, locale)
+  rescue ex : ChannelRedirect
+    next env.redirect env.request.resource.gsub(ucid, ex.channel_id)
   rescue ex
     error_message = ex.message
     env.response.status_code = 500
@@ -3035,6 +3037,8 @@ get "/channel/:ucid" do |env|
 
   begin
     channel = get_about_info(ucid, locale)
+  rescue ex : ChannelRedirect
+    next env.redirect env.request.resource.gsub(ucid, ex.channel_id)
   rescue ex
     error_message = ex.message
     env.response.status_code = 500
@@ -3102,6 +3106,8 @@ get "/channel/:ucid/playlists" do |env|
 
   begin
     channel = get_about_info(ucid, locale)
+  rescue ex : ChannelRedirect
+    next env.redirect env.request.resource.gsub(ucid, ex.channel_id)
   rescue ex
     error_message = ex.message
     env.response.status_code = 500
@@ -3140,6 +3146,8 @@ get "/channel/:ucid/community" do |env|
 
   begin
     channel = get_about_info(ucid, locale)
+  rescue ex : ChannelRedirect
+    next env.redirect env.request.resource.gsub(ucid, ex.channel_id)
   rescue ex
     error_message = ex.message
     env.response.status_code = 500
@@ -3195,7 +3203,10 @@ get "/api/v1/storyboards/:id" do |env|
   begin
     video = get_video(id, PG_DB, region: region)
   rescue ex : VideoRedirect
-    next env.redirect "/api/v1/storyboards/#{ex.message}"
+    error_message = {"error" => "Video is unavailable", "videoId" => ex.video_id}.to_json
+    env.response.status_code = 302
+    env.response.headers["Location"] = env.request.resource.gsub(id, ex.video_id)
+    next error_message
   rescue ex
     env.response.status_code = 500
     next
@@ -3280,7 +3291,10 @@ get "/api/v1/captions/:id" do |env|
   begin
     video = get_video(id, PG_DB, region: region)
   rescue ex : VideoRedirect
-    next env.redirect "/api/v1/captions/#{ex.message}"
+    error_message = {"error" => "Video is unavailable", "videoId" => ex.video_id}.to_json
+    env.response.status_code = 302
+    env.response.headers["Location"] = env.request.resource.gsub(id, ex.video_id)
+    next error_message
   rescue ex
     env.response.status_code = 500
     next
@@ -3620,7 +3634,10 @@ get "/api/v1/videos/:id" do |env|
   begin
     video = get_video(id, PG_DB, region: region)
   rescue ex : VideoRedirect
-    next env.redirect "/api/v1/videos/#{ex.message}"
+    error_message = {"error" => "Video is unavailable", "videoId" => ex.video_id}.to_json
+    env.response.status_code = 302
+    env.response.headers["Location"] = env.request.resource.gsub(id, ex.video_id)
+    next error_message
   rescue ex
     error_message = {"error" => ex.message}.to_json
     env.response.status_code = 500
@@ -3723,6 +3740,11 @@ get "/api/v1/channels/:ucid" do |env|
 
   begin
     channel = get_about_info(ucid, locale)
+  rescue ex : ChannelRedirect
+    error_message = {"error" => "Channel is unavailable", "authorId" => ex.channel_id}.to_json
+    env.response.status_code = 302
+    env.response.headers["Location"] = env.request.resource.gsub(ucid, ex.channel_id)
+    next error_message
   rescue ex
     error_message = {"error" => ex.message}.to_json
     env.response.status_code = 500
@@ -3853,6 +3875,11 @@ end
 
     begin
       channel = get_about_info(ucid, locale)
+    rescue ex : ChannelRedirect
+      error_message = {"error" => "Channel is unavailable", "authorId" => ex.channel_id}.to_json
+      env.response.status_code = 302
+      env.response.headers["Location"] = env.request.resource.gsub(ucid, ex.channel_id)
+      next error_message
     rescue ex
       error_message = {"error" => ex.message}.to_json
       env.response.status_code = 500
@@ -3917,6 +3944,11 @@ end
 
     begin
       channel = get_about_info(ucid, locale)
+    rescue ex : ChannelRedirect
+      error_message = {"error" => "Channel is unavailable", "authorId" => ex.channel_id}.to_json
+      env.response.status_code = 302
+      env.response.headers["Location"] = env.request.resource.gsub(ucid, ex.channel_id)
+      next error_message
     rescue ex
       error_message = {"error" => ex.message}.to_json
       env.response.status_code = 500
@@ -4501,11 +4533,7 @@ get "/api/manifest/dash/id/:id" do |env|
   begin
     video = get_video(id, PG_DB, region: region)
   rescue ex : VideoRedirect
-    url = "/api/manifest/dash/id/#{ex.message}"
-    if env.params.query
-      url += "?#{env.params.query}"
-    end
-    next env.redirect url
+    next env.redirect env.request.resource.gsub(id, ex.video_id)
   rescue ex
     env.response.status_code = 403
     next
diff --git a/src/invidious/channels.cr b/src/invidious/channels.cr
index 00eac9020..3291efbd9 100644
--- a/src/invidious/channels.cr
+++ b/src/invidious/channels.cr
@@ -127,6 +127,13 @@ struct AboutChannel
   })
 end
 
+class ChannelRedirect < Exception
+  property channel_id : String
+
+  def initialize(@channel_id)
+  end
+end
+
 def get_batch_channels(channels, db, refresh = false, pull_all_videos = true, max_threads = 10)
   finished_channel = Channel(String | Nil).new
 
@@ -927,6 +934,10 @@ def get_about_info(ucid, locale)
     about = client.get("/user/#{ucid}/about?disable_polymer=1&gl=US&hl=en")
   end
 
+  if md = about.headers["location"]?.try &.match(/\/channel\/(?<ucid>UC[a-zA-Z0-9_-]{22})/)
+    raise ChannelRedirect.new(channel_id: md["ucid"])
+  end
+
   about = XML.parse_html(about.body)
 
   if about.xpath_node(%q(//div[contains(@class, "channel-empty-message")]))
diff --git a/src/invidious/videos.cr b/src/invidious/videos.cr
index 7b68656e9..3cda835b2 100644
--- a/src/invidious/videos.cr
+++ b/src/invidious/videos.cr
@@ -882,6 +882,10 @@ struct CaptionName
 end
 
 class VideoRedirect < Exception
+  property video_id : String
+
+  def initialize(@video_id)
+  end
 end
 
 def get_video(id, db, refresh = true, region = nil, force_refresh = false)
@@ -1149,7 +1153,7 @@ def fetch_video(id, region)
   response = client.get("/watch?v=#{id}&gl=US&hl=en&disable_polymer=1&has_verified=1&bpctr=9999999999")
 
   if md = response.headers["location"]?.try &.match(/v=(?<id>[a-zA-Z0-9_-]{11})/)
-    raise VideoRedirect.new(md["id"])
+    raise VideoRedirect.new(video_id: md["id"])
   end
 
   html = XML.parse_html(response.body)