Add support for custom channel URLs

src/invidious.cr

@@ -232,28 +232,6 @@ end
 
 # Videos
 
-get "/:id" do |env|
-  locale = LOCALES[env.get("locale").as(String)]?
-  id = env.params.url["id"]
-
-  if md = id.match(/[a-zA-Z0-9_-]{11}/)
-    params = [] of String
-    env.params.query.each do |k, v|
-      params << "#{k}=#{v}"
-    end
-    params = params.join("&")
-
-    url = "/watch?v=#{id}"
-    if !params.empty?
-      url += "&#{params}"
-    end
-
-    env.redirect url
-  else
-    env.response.status_code = 404
-  end
-end
-
 get "/watch" do |env|
   locale = LOCALES[env.get("locale").as(String)]?
   region = env.params.query["region"]?
@@ -4147,7 +4125,7 @@ get "/vi/:id/:name" do |env|
 end
 
 error 404 do |env|
-  if md = env.request.path.match(/^\/(?<id>[a-zA-Z0-9_-]{11})/)
+  if md = env.request.path.match(/^\/(?<id>[a-zA-Z0-9_-]{11})$/)
     id = md["id"]
 
     params = [] of String
@@ -4161,8 +4139,30 @@ error 404 do |env|
       url += "&#{params}"
     end
 
-    env.response.headers["Location"] = url
-    halt env, status_code: 302
+    client = make_client(YT_URL)
+    if client.head("/#{id}").status_code == 404
+      env.response.headers["Location"] = url
+      halt env, status_code: 302
+    end
+  end
+
+  if md = env.request.path.match(/^\/(?<name>\w+)$/)
+    name = md["name"]
+
+    client = make_client(YT_URL)
+    response = client.get("/#{name}")
+
+    if response.status_code == 301
+      response = client.get(response.headers["Location"])
+    end
+
+    html = XML.parse_html(response.body)
+    ucid = html.xpath_node(%q(//meta[@itemprop="channelId"]))
+
+    if ucid
+      env.response.headers["Location"] = "/channel/#{ucid["content"]}"
+      halt env, status_code: 302
+    end
   end
 
   env.response.headers["Location"] = "/"