Add support for community post page/comments (#4010)

src/invidious/routes/api/v1/channels.cr

@@ -343,6 +343,59 @@ module Invidious::Routes::API::V1::Channels
     end
   end
 
+  def self.post(env)
+    locale = env.get("preferences").as(Preferences).locale
+
+    env.response.content_type = "application/json"
+    id = env.params.url["id"].to_s
+    ucid = env.params.query["ucid"]?
+
+    thin_mode = env.params.query["thin_mode"]?
+    thin_mode = thin_mode == "true"
+
+    format = env.params.query["format"]?
+    format ||= "json"
+
+    if ucid.nil?
+      response = YoutubeAPI.resolve_url("https://www.youtube.com/post/#{id}")
+      return error_json(400, "Invalid post ID") if response["error"]?
+      ucid = response.dig("endpoint", "browseEndpoint", "browseId").as_s
+    else
+      ucid = ucid.to_s
+    end
+
+    begin
+      fetch_channel_community_post(ucid, id, locale, format, thin_mode)
+    rescue ex
+      return error_json(500, ex)
+    end
+  end
+
+  def self.post_comments(env)
+    locale = env.get("preferences").as(Preferences).locale
+
+    env.response.content_type = "application/json"
+
+    id = env.params.url["id"]
+
+    thin_mode = env.params.query["thin_mode"]?
+    thin_mode = thin_mode == "true"
+
+    format = env.params.query["format"]?
+    format ||= "json"
+
+    continuation = env.params.query["continuation"]?
+
+    case continuation
+    when nil, ""
+      ucid = env.params.query["ucid"]
+      comments = Comments.fetch_community_post_comments(ucid, id)
+    else
+      comments = YoutubeAPI.browse(continuation: continuation)
+    end
+    return Comments.parse_youtube(id, comments, format, locale, thin_mode, isPost: true)
+  end
+
   def self.channels(env)
     locale = env.get("preferences").as(Preferences).locale
     ucid = env.params.url["ucid"]

src/invidious/routes/api/v1/misc.cr

@@ -162,17 +162,20 @@ module Invidious::Routes::API::V1::Misc
       resolved_url = YoutubeAPI.resolve_url(url.as(String))
       endpoint = resolved_url["endpoint"]
       pageType = endpoint.dig?("commandMetadata", "webCommandMetadata", "webPageType").try &.as_s || ""
-      if resolved_ucid = endpoint.dig?("watchEndpoint", "videoId")
-      elsif resolved_ucid = endpoint.dig?("browseEndpoint", "browseId")
-      elsif pageType == "WEB_PAGE_TYPE_UNKNOWN"
+      if pageType == "WEB_PAGE_TYPE_UNKNOWN"
         return error_json(400, "Unknown url")
       end
+
+      sub_endpoint = endpoint["watchEndpoint"]? || endpoint["browseEndpoint"]? || endpoint
+      params = sub_endpoint.try &.dig?("params")
     rescue ex
       return error_json(500, ex)
     end
     JSON.build do |json|
       json.object do
-        json.field "ucid", resolved_ucid.try &.as_s || ""
+        json.field "ucid", sub_endpoint["browseId"].as_s if sub_endpoint["browseId"]?
+        json.field "videoId", sub_endpoint["videoId"].as_s if sub_endpoint["videoId"]?
+        json.field "params", params.try &.as_s
         json.field "pageType", pageType
       end
     end

src/invidious/routes/channels.cr

@@ -165,6 +165,11 @@ module Invidious::Routes::Channels
     end
     locale, user, subscriptions, continuation, ucid, channel = data
 
+    # redirect to post page
+    if lb = env.params.query["lb"]?
+      env.redirect "/post/#{URI.encode_www_form(lb)}?ucid=#{URI.encode_www_form(ucid)}"
+    end
+
     thin_mode = env.params.query["thin_mode"]? || env.get("preferences").as(Preferences).thin_mode
     thin_mode = thin_mode == "true"
 
@@ -193,6 +198,44 @@ module Invidious::Routes::Channels
     templated "community"
   end
 
+  def self.post(env)
+    # /post/{postId}
+    id = env.params.url["id"]
+    ucid = env.params.query["ucid"]?
+
+    prefs = env.get("preferences").as(Preferences)
+
+    locale = prefs.locale
+
+    thin_mode = env.params.query["thin_mode"]? || prefs.thin_mode
+    thin_mode = thin_mode == "true"
+
+    nojs = env.params.query["nojs"]?
+
+    nojs ||= "0"
+    nojs = nojs == "1"
+
+    if !ucid.nil?
+      ucid = ucid.to_s
+      post_response = fetch_channel_community_post(ucid, id, locale, "json", thin_mode)
+    else
+      # resolve the url to get the author's UCID
+      response = YoutubeAPI.resolve_url("https://www.youtube.com/post/#{id}")
+      return error_template(400, "Invalid post ID") if response["error"]?
+
+      ucid = response.dig("endpoint", "browseEndpoint", "browseId").as_s
+      post_response = fetch_channel_community_post(ucid, id, locale, "json", thin_mode)
+    end
+
+    post_response = JSON.parse(post_response)
+
+    if nojs
+      comments = Comments.fetch_community_post_comments(ucid, id)
+      comment_html = JSON.parse(Comments.parse_youtube(id, comments, "html", locale, thin_mode, isPost: true))["contentHtml"]
+    end
+    templated "post"
+  end
+
   def self.channels(env)
     data = self.fetch_basic_information(env)
     return data if !data.is_a?(Tuple)