extractors: Add continuation token parser

pull/3419/head
Samantaz Fox 2 years ago
parent bdc51cd20f
commit ce7db8d2cb
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@ -4,7 +4,7 @@ Spectator.describe Invidious::Hashtag do
it "parses richItemRenderer containers (test 1)" do
# Enable mock
test_content = load_mock("hashtag/martingarrix_page1")
videos = extract_items(test_content)
videos, _ = extract_items(test_content)
expect(typeof(videos)).to eq(Array(SearchItem))
expect(videos.size).to eq(60)
@ -57,7 +57,7 @@ Spectator.describe Invidious::Hashtag do
it "parses richItemRenderer containers (test 2)" do
# Enable mock
test_content = load_mock("hashtag/martingarrix_page2")
videos = extract_items(test_content)
videos, _ = extract_items(test_content)
expect(typeof(videos)).to eq(Array(SearchItem))
expect(videos.size).to eq(60)

@ -1,18 +1,7 @@
def fetch_channel_playlists(ucid, author, continuation, sort_by)
if continuation
response_json = YoutubeAPI.browse(continuation)
continuation_items = response_json["onResponseReceivedActions"]?
.try &.[0]["appendContinuationItemsAction"]["continuationItems"]
return [] of SearchItem, nil if !continuation_items
items = [] of SearchItem
continuation_items.as_a.select(&.as_h.has_key?("gridPlaylistRenderer")).each { |item|
parse_item(item, author, ucid).try { |t| items << t }
}
continuation = continuation_items.as_a.last["continuationItemRenderer"]?
.try &.["continuationEndpoint"]["continuationCommand"]["token"].as_s
items, continuation = extract_items(response_json, author, ucid)
else
url = "/channel/#{ucid}/playlists?flow=list&view=1"
@ -30,8 +19,7 @@ def fetch_channel_playlists(ucid, author, continuation, sort_by)
initial_data = extract_initial_data(response.body)
return [] of SearchItem, nil if !initial_data
items = extract_items(initial_data, author, ucid)
continuation = response.body.match(/"token":"(?<continuation>[^"]+)"/).try &.["continuation"]?
items, continuation = extract_items(initial_data, author, ucid)
end
return items, continuation

@ -8,7 +8,8 @@ module Invidious::Hashtag
client_config = YoutubeAPI::ClientConfig.new(region: region)
response = YoutubeAPI.browse(continuation: ctoken, client_config: client_config)
return extract_items(response)
items, _ = extract_items(response)
return items
end
def generate_continuation(hashtag : String, cursor : Int)

@ -265,4 +265,11 @@ class Category
end
end
struct Continuation
getter token
def initialize(@token : String)
end
end
alias SearchItem = SearchVideo | SearchChannel | SearchPlaylist | Category

@ -9,7 +9,8 @@ module Invidious::Search
client_config = YoutubeAPI::ClientConfig.new(region: query.region)
initial_data = YoutubeAPI.search(query.text, search_params, client_config: client_config)
return extract_items(initial_data)
items, _ = extract_items(initial_data)
return items
end
# Search a youtube channel
@ -30,16 +31,7 @@ module Invidious::Search
continuation = produce_channel_search_continuation(ucid, query.text, query.page)
response_json = YoutubeAPI.browse(continuation)
continuation_items = response_json["onResponseReceivedActions"]?
.try &.[0]["appendContinuationItemsAction"]["continuationItems"]
return [] of SearchItem if !continuation_items
items = [] of SearchItem
continuation_items.as_a.select(&.as_h.has_key?("itemSectionRenderer")).each do |item|
parse_item(item["itemSectionRenderer"]["contents"].as_a[0]).try { |t| items << t }
end
items, _ = extract_items(response_json, "", ucid)
return items
end

@ -7,7 +7,7 @@ require "../helpers/serialized_yt_data"
private ITEM_CONTAINER_EXTRACTOR = {
Extractors::YouTubeTabs,
Extractors::SearchResults,
Extractors::Continuation,
Extractors::ContinuationContent,
}
private ITEM_PARSERS = {
@ -18,6 +18,7 @@ private ITEM_PARSERS = {
Parsers::CategoryRendererParser,
Parsers::RichItemRendererParser,
Parsers::ReelItemRendererParser,
Parsers::ContinuationItemRendererParser,
}
private alias InitialData = Hash(String, JSON::Any)
@ -347,14 +348,9 @@ private module Parsers
content_container = item_contents["contents"]
end
raw_contents = content_container["items"]?.try &.as_a
if !raw_contents.nil?
raw_contents.each do |item|
result = parse_item(item)
if !result.nil?
contents << result
end
end
content_container["items"]?.try &.as_a.each do |item|
result = parse_item(item, author_fallback.name, author_fallback.id)
contents << result if result.is_a?(SearchItem)
end
Category.new({
@ -477,6 +473,35 @@ private module Parsers
return {{@type.name}}
end
end
# Parses an InnerTube continuationItemRenderer into a Continuation.
# Returns nil when the given object isn't a continuationItemRenderer.
#
# continuationItemRenderer contains various metadata ued to load more
# content (i.e when the user scrolls down). The interesting bit is the
# protobuf object known as the "continutation token". Previously, those
# were generated from sratch, but recent (as of 11/2022) Youtube changes
# are forcing us to extract them from replies.
#
module ContinuationItemRendererParser
def self.process(item : JSON::Any, author_fallback : AuthorFallback)
if item_contents = item["continuationItemRenderer"]?
return self.parse(item_contents)
end
end
private def self.parse(item_contents)
token = item_contents
.dig?("continuationEndpoint", "continuationCommand", "token")
.try &.as_s
return Continuation.new(token) if token
end
def self.parser_name
return {{@type.name}}
end
end
end
# The following are the extractors for extracting an array of items from
@ -746,13 +771,18 @@ def extract_items(
initial_data : InitialData,
author_fallback : String? = nil,
author_id_fallback : String? = nil
) : Array(SearchItem)
) : {Array(SearchItem), String?}
items = [] of SearchItem
continuation = nil
extract_items(initial_data) do |item|
parsed = parse_item(item, author_fallback, author_id_fallback)
items << parsed if !parsed.nil?
case parsed
when .is_a?(Continuation) then continuation = parsed.token
when .is_a?(SearchItem) then items << parsed
end
end
return items
return items, continuation
end

@ -68,10 +68,10 @@ rescue ex
return false
end
def extract_videos(initial_data : Hash(String, JSON::Any), author_fallback : String? = nil, author_id_fallback : String? = nil)
extracted = extract_items(initial_data, author_fallback, author_id_fallback)
def extract_videos(initial_data : Hash(String, JSON::Any), author_fallback : String? = nil, author_id_fallback : String? = nil) : Array(SearchVideo)
extracted, _ = extract_items(initial_data, author_fallback, author_id_fallback)
target = [] of SearchItem
target = [] of (SearchItem | Continuation)
extracted.each do |i|
if i.is_a?(Category)
i.contents.each { |cate_i| target << cate_i if !cate_i.is_a? Video }
@ -79,28 +79,11 @@ def extract_videos(initial_data : Hash(String, JSON::Any), author_fallback : Str
target << i
end
end
return target.select(SearchVideo).map(&.as(SearchVideo))
return target.select(SearchVideo)
end
def extract_selected_tab(tabs)
# Extract the selected tab from the array of tabs Youtube returns
return selected_target = tabs.as_a.select(&.["tabRenderer"]?.try &.["selected"]?.try &.as_bool)[0]["tabRenderer"]
end
def fetch_continuation_token(items : Array(JSON::Any))
# Fetches the continuation token from an array of items
return items.last["continuationItemRenderer"]?
.try &.["continuationEndpoint"]["continuationCommand"]["token"].as_s
end
def fetch_continuation_token(initial_data : Hash(String, JSON::Any))
# Fetches the continuation token from initial data
if initial_data["onResponseReceivedActions"]?
continuation_items = initial_data["onResponseReceivedActions"][0]["appendContinuationItemsAction"]["continuationItems"]
else
tab = extract_selected_tab(initial_data["contents"]["twoColumnBrowseResultsRenderer"]["tabs"])
continuation_items = tab["content"]["sectionListRenderer"]["contents"][0]["itemSectionRenderer"]["contents"][0]["gridRenderer"]["items"]
end
return fetch_continuation_token(continuation_items.as_a)
end

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