624 行
22 KiB
Crystal
624 行
22 KiB
Crystal
# This file contains helper methods to parse the Youtube API json data into
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# neat little packages we can use
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# Tuple of Parsers/Extractors so we can easily cycle through them.
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private ITEM_CONTAINER_EXTRACTOR = {
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Extractors::YouTubeTabs,
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Extractors::SearchResults,
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Extractors::Continuation,
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}
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private ITEM_PARSERS = {
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Parsers::VideoRendererParser,
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Parsers::ChannelRendererParser,
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Parsers::GridPlaylistRendererParser,
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Parsers::PlaylistRendererParser,
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Parsers::CategoryRendererParser,
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}
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record AuthorFallback, name : String, id : String
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# Namespace for logic relating to parsing InnerTube data into various datastructs.
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#
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# Each of the parsers in this namespace are accessed through the #process() method
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# which validates the given data as applicable to itself. If it is applicable the given
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# data is passed to the private `#parse()` method which returns a datastruct of the given
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# type. Otherwise, nil is returned.
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private module Parsers
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# Parses a InnerTube videoRenderer into a SearchVideo. Returns nil when the given object isn't a videoRenderer
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#
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# A videoRenderer renders a video to click on within the YouTube and Invidious UI. It is **not**
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# the watchable video itself.
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#
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# See specs for example.
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#
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# `videoRenderer`s can be found almost everywhere on YouTube. In categories, search results, channels, etc.
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#
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module VideoRendererParser
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def self.process(item : JSON::Any, author_fallback : AuthorFallback)
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if item_contents = (item["videoRenderer"]? || item["gridVideoRenderer"]?)
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return self.parse(item_contents, author_fallback)
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end
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end
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private def self.parse(item_contents, author_fallback)
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video_id = item_contents["videoId"].as_s
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title = extract_text(item_contents["title"]?) || ""
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# Extract author information
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if author_info = item_contents.dig?("ownerText", "runs", 0)
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author = author_info["text"].as_s
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author_id = HelperExtractors.get_browse_id(author_info)
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else
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author = author_fallback.name
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author_id = author_fallback.id
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end
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# For live videos (and possibly recently premiered videos) there is no published information.
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# Instead, in its place is the amount of people currently watching. This behavior should be replicated
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# on Invidious once all features of livestreams are supported. On an unrelated note, defaulting to the current
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# time for publishing isn't a good idea.
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published = item_contents.dig?("publishedTimeText", "simpleText").try { |t| decode_date(t.as_s) } || Time.local
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# Typically views are stored under a "simpleText" in the "viewCountText". However, for
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# livestreams and premiered it is stored under a "runs" array: [{"text":123}, {"text": "watching"}]
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# When view count is disabled the "viewCountText" is not present on InnerTube data.
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# TODO change default value to nil and typical encoding type to tuple storing type (watchers, views, etc)
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# and count
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view_count = item_contents.dig?("viewCountText", "simpleText").try &.as_s.gsub(/\D+/, "").to_i64? || 0_i64
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description_html = item_contents["descriptionSnippet"]?.try { |t| parse_content(t) } || ""
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# The length information *should* only always exist in "lengthText". However, the legacy Invidious code
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# extracts from "thumbnailOverlays" when it doesn't. More testing is needed to see if this is
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# actually needed
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if length_container = item_contents["lengthText"]?
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length_seconds = decode_length_seconds(length_container["simpleText"].as_s)
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elsif length_container = item_contents["thumbnailOverlays"]?.try &.as_a.find(&.["thumbnailOverlayTimeStatusRenderer"]?)
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# This needs to only go down the `simpleText` path (if possible). If more situations came up that requires
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# a specific pathway then we should add an argument to extract_text that'll make this possible
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length_seconds = length_container.dig?("thumbnailOverlayTimeStatusRenderer", "text", "simpleText")
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if length_seconds
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length_seconds = decode_length_seconds(length_seconds.as_s)
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else
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length_seconds = 0
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end
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else
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length_seconds = 0
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end
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live_now = false
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paid = false
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premium = false
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premiere_timestamp = item_contents.dig?("upcomingEventData", "startTime").try { |t| Time.unix(t.as_s.to_i64) }
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item_contents["badges"]?.try &.as_a.each do |badge|
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b = badge["metadataBadgeRenderer"]
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case b["label"].as_s
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when "LIVE NOW"
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live_now = true
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when "New", "4K", "CC"
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# TODO
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when "Premium"
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# TODO: Potentially available as item_contents["topStandaloneBadge"]["metadataBadgeRenderer"]
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premium = true
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else nil # Ignore
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end
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end
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SearchVideo.new({
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title: title,
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id: video_id,
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author: author,
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ucid: author_id,
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published: published,
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views: view_count,
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description_html: description_html,
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length_seconds: length_seconds,
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live_now: live_now,
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premium: premium,
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premiere_timestamp: premiere_timestamp,
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})
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end
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def self.parser_name
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return {{@type.name}}
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end
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end
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# Parses a InnerTube channelRenderer into a SearchChannel. Returns nil when the given object isn't a channelRenderer
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#
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# A channelRenderer renders a channel to click on within the YouTube and Invidious UI. It is **not**
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# the channel page itself.
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#
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# See specs for example.
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#
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# `channelRenderer`s can be found almost everywhere on YouTube. In categories, search results, channels, etc.
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#
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module ChannelRendererParser
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def self.process(item : JSON::Any, author_fallback : AuthorFallback)
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if item_contents = (item["channelRenderer"]? || item["gridChannelRenderer"]?)
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return self.parse(item_contents, author_fallback)
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end
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end
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private def self.parse(item_contents, author_fallback)
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author = extract_text(item_contents["title"]) || author_fallback.name
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author_id = item_contents["channelId"]?.try &.as_s || author_fallback.id
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author_thumbnail = HelperExtractors.get_thumbnails(item_contents)
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# When public subscriber count is disabled, the subscriberCountText isn't sent by InnerTube.
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# Always simpleText
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# TODO change default value to nil
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subscriber_count = item_contents.dig?("subscriberCountText", "simpleText")
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.try { |s| short_text_to_number(s.as_s.split(" ")[0]) } || 0
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# Auto-generated channels doesn't have videoCountText
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# Taken from: https://github.com/iv-org/invidious/pull/2228#discussion_r717620922
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auto_generated = item_contents["videoCountText"]?.nil?
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video_count = HelperExtractors.get_video_count(item_contents)
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description_html = item_contents["descriptionSnippet"]?.try { |t| parse_content(t) } || ""
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SearchChannel.new({
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author: author,
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ucid: author_id,
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author_thumbnail: author_thumbnail,
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subscriber_count: subscriber_count,
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video_count: video_count,
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description_html: description_html,
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auto_generated: auto_generated,
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})
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end
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def self.parser_name
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return {{@type.name}}
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end
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end
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# Parses a InnerTube gridPlaylistRenderer into a SearchPlaylist. Returns nil when the given object isn't a gridPlaylistRenderer
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#
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# A gridPlaylistRenderer renders a playlist, that is located in a grid, to click on within the YouTube and Invidious UI.
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# It is **not** the playlist itself.
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#
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# See specs for example.
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#
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# `gridPlaylistRenderer`s can be found on the playlist-tabs of channels and expanded categories.
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#
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module GridPlaylistRendererParser
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def self.process(item : JSON::Any, author_fallback : AuthorFallback)
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if item_contents = item["gridPlaylistRenderer"]?
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return self.parse(item_contents, author_fallback)
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end
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end
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private def self.parse(item_contents, author_fallback)
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title = extract_text(item_contents["title"]) || ""
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plid = item_contents["playlistId"]?.try &.as_s || ""
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video_count = HelperExtractors.get_video_count(item_contents)
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playlist_thumbnail = HelperExtractors.get_thumbnails(item_contents)
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SearchPlaylist.new({
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title: title,
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id: plid,
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author: author_fallback.name,
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ucid: author_fallback.id,
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video_count: video_count,
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videos: [] of SearchPlaylistVideo,
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thumbnail: playlist_thumbnail,
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})
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end
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def self.parser_name
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return {{@type.name}}
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end
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end
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# Parses a InnerTube playlistRenderer into a SearchPlaylist. Returns nil when the given object isn't a playlistRenderer
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#
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# A playlistRenderer renders a playlist to click on within the YouTube and Invidious UI. It is **not** the playlist itself.
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#
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# See specs for example.
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#
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# `playlistRenderer`s can be found almost everywhere on YouTube. In categories, search results, recommended, etc.
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#
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module PlaylistRendererParser
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def self.process(item : JSON::Any, author_fallback : AuthorFallback)
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if item_contents = item["playlistRenderer"]?
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return self.parse(item_contents, author_fallback)
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end
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end
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private def self.parse(item_contents, author_fallback)
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title = item_contents["title"]["simpleText"]?.try &.as_s || ""
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plid = item_contents["playlistId"]?.try &.as_s || ""
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video_count = HelperExtractors.get_video_count(item_contents)
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playlist_thumbnail = HelperExtractors.get_thumbnails_plural(item_contents)
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author_info = item_contents.dig?("shortBylineText", "runs", 0)
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author = author_info.try &.["text"].as_s || author_fallback.name
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author_id = author_info.try { |x| HelperExtractors.get_browse_id(x) } || author_fallback.id
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videos = item_contents["videos"]?.try &.as_a.map do |v|
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v = v["childVideoRenderer"]
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v_title = v.dig?("title", "simpleText").try &.as_s || ""
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v_id = v["videoId"]?.try &.as_s || ""
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v_length_seconds = v.dig?("lengthText", "simpleText").try { |t| decode_length_seconds(t.as_s) } || 0
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SearchPlaylistVideo.new({
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title: v_title,
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id: v_id,
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length_seconds: v_length_seconds,
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})
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end || [] of SearchPlaylistVideo
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# TODO: item_contents["publishedTimeText"]?
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SearchPlaylist.new({
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title: title,
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id: plid,
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author: author,
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ucid: author_id,
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video_count: video_count,
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videos: videos,
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thumbnail: playlist_thumbnail,
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})
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end
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def self.parser_name
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return {{@type.name}}
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end
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end
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# Parses a InnerTube shelfRenderer into a Category. Returns nil when the given object isn't a shelfRenderer
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#
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# A shelfRenderer renders divided sections on YouTube. IE "People also watched" in search results and
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# the various organizational sections in the channel home page. A separate one (richShelfRenderer) is used
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# for YouTube home. A shelfRenderer can also sometimes be expanded to show more content within it.
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#
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# See specs for example.
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#
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# `shelfRenderer`s can be found almost everywhere on YouTube. In categories, search results, channels, etc.
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#
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module CategoryRendererParser
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def self.process(item : JSON::Any, author_fallback : AuthorFallback)
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if item_contents = item["shelfRenderer"]?
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return self.parse(item_contents, author_fallback)
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end
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end
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private def self.parse(item_contents, author_fallback)
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title = extract_text(item_contents["title"]?) || ""
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url = item_contents.dig?("endpoint", "commandMetadata", "webCommandMetadata", "url")
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.try &.as_s
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# Sometimes a category can have badges.
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badges = [] of Tuple(String, String) # (Badge style, label)
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item_contents["badges"]?.try &.as_a.each do |badge|
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badge = badge["metadataBadgeRenderer"]
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badges << {badge["style"].as_s, badge["label"].as_s}
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end
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# Category description
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description_html = item_contents["subtitle"]?.try { |desc| parse_content(desc) } || ""
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# Content parsing
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contents = [] of SearchItem
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# InnerTube recognizes some "special" categories, which are organized differently.
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if special_category_container = item_contents["content"]?
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if content_container = special_category_container["horizontalListRenderer"]?
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elsif content_container = special_category_container["expandedShelfContentsRenderer"]?
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elsif content_container = special_category_container["verticalListRenderer"]?
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else
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# Anything else, such as `horizontalMovieListRenderer` is currently unsupported.
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return
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end
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else
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# "Normal" category.
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content_container = item_contents["contents"]
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end
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raw_contents = content_container["items"].as_a
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raw_contents.each do |item|
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result = extract_item(item)
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if !result.nil?
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contents << result
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end
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end
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Category.new({
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title: title,
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contents: contents,
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description_html: description_html,
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url: url,
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badges: badges,
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})
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end
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def self.parser_name
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return {{@type.name}}
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end
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end
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end
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# The following are the extractors for extracting an array of items from
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# the internal Youtube API's JSON response. The result is then packaged into
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# a structure we can more easily use via the parsers above. Their internals are
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# identical to the item parsers.
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# Namespace for logic relating to extracting InnerTube's initial response to items we can parse.
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#
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# Each of the extractors in this namespace are accessed through the #process() method
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# which validates the given data as applicable to itself. If it is applicable the given
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# data is passed to the private `#extract()` method which returns an array of
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# parsable items. Otherwise, nil is returned.
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#
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# NOTE perhaps the result from here should be abstracted into a struct in order to
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# get additional metadata regarding the container of the item(s).
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private module Extractors
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# Extracts items from the selected YouTube tab.
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#
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# YouTube tabs are typically stored under "twoColumnBrowseResultsRenderer"
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# and is structured like this:
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#
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# "twoColumnBrowseResultsRenderer": {
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# {"tabs": [
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# {"tabRenderer": {
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# "endpoint": {...}
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# "title": "Playlists",
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# "selected": true,
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# "content": {...},
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# ...
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# }}
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# ]}
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# }]
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#
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module YouTubeTabs
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def self.process(initial_data : Hash(String, JSON::Any))
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if target = initial_data["twoColumnBrowseResultsRenderer"]?
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self.extract(target)
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end
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end
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private def self.extract(target)
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raw_items = [] of JSON::Any
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content = extract_selected_tab(target["tabs"])["content"]
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content["sectionListRenderer"]["contents"].as_a.each do |renderer_container|
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renderer_container_contents = renderer_container["itemSectionRenderer"]["contents"][0]
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# Category extraction
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if items_container = renderer_container_contents["shelfRenderer"]?
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raw_items << renderer_container_contents
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next
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elsif items_container = renderer_container_contents["gridRenderer"]?
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else
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items_container = renderer_container_contents
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end
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items_container["items"].as_a.each do |item|
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raw_items << item
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end
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end
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return raw_items
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end
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def self.extractor_name
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return {{@type.name}}
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end
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end
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# Extracts items from the InnerTube response for search results
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#
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# Search results are typically stored under "twoColumnSearchResultsRenderer"
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# and is structured like this:
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#
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# "twoColumnSearchResultsRenderer": {
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# {"primaryContents": {
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# {"sectionListRenderer": {
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# "contents": [...],
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# ...,
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# "subMenu": {...},
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# "hideBottomSeparator": true,
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# "targetId": "search-feed"
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# }}
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# }}
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# }
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#
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module SearchResults
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def self.process(initial_data : Hash(String, JSON::Any))
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if target = initial_data["twoColumnSearchResultsRenderer"]?
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self.extract(target)
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end
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end
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private def self.extract(target)
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raw_items = [] of Array(JSON::Any)
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target.dig("primaryContents", "sectionListRenderer", "contents").as_a.each do |node|
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if node = node["itemSectionRenderer"]?
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raw_items << node["contents"].as_a
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end
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end
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return raw_items.flatten
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end
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def self.extractor_name
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return {{@type.name}}
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end
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end
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# Extracts continuation items from a InnerTube response
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#
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# Continuation items (on YouTube) are items which are appended to the
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# end of the page for continuous scrolling. As such, in many cases,
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# the items are lacking information such as author or category title,
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# since the original results has already rendered them on the top of the page.
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#
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# The way they are structured is too varied to be accurately written down here.
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# However, they all eventually lead to an array of parsable items after traversing
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# through the JSON structure.
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module Continuation
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def self.process(initial_data : Hash(String, JSON::Any))
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if target = initial_data["continuationContents"]?
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self.extract(target)
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elsif target = initial_data["appendContinuationItemsAction"]?
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self.extract(target)
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end
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end
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private def self.extract(target)
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raw_items = [] of JSON::Any
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if content = target["gridContinuation"]?
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raw_items = content["items"].as_a
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elsif content = target["continuationItems"]?
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raw_items = content.as_a
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end
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return raw_items
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end
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def self.extractor_name
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return {{@type.name}}
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end
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end
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end
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|
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# Helper methods to aid in the parsing of InnerTube to data structs.
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#
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# Mostly used to extract out repeated structures to deal with code
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# repetition.
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private module HelperExtractors
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# Retrieves the amount of videos present within the given InnerTube data.
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#
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# Returns a 0 when it's unable to do so
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def self.get_video_count(container : JSON::Any) : Int32
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if box = container["videoCountText"]?
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return extract_text(box).try &.gsub(/\D/, "").to_i || 0
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|
elsif box = container["videoCount"]?
|
|
return box.as_s.to_i
|
|
else
|
|
return 0
|
|
end
|
|
end
|
|
|
|
# Retrieve lowest quality thumbnail from InnerTube data
|
|
#
|
|
# TODO allow configuration of image quality (-1 is highest)
|
|
#
|
|
# Raises when it's unable to parse from the given JSON data.
|
|
def self.get_thumbnails(container : JSON::Any) : String
|
|
return container.dig("thumbnail", "thumbnails", 0, "url").as_s
|
|
end
|
|
|
|
# ditto
|
|
#
|
|
# YouTube sometimes sends the thumbnail as:
|
|
# {"thumbnails": [{"thumbnails": [{"url": "example.com"}, ...]}]}
|
|
def self.get_thumbnails_plural(container : JSON::Any) : String
|
|
return container.dig("thumbnails", 0, "thumbnails", 0, "url").as_s
|
|
end
|
|
|
|
# Retrieves the ID required for querying the InnerTube browse endpoint.
|
|
# Raises when it's unable to do so
|
|
def self.get_browse_id(container)
|
|
return container.dig("navigationEndpoint", "browseEndpoint", "browseId").as_s
|
|
end
|
|
end
|
|
|
|
# Extracts text from InnerTube response
|
|
#
|
|
# InnerTube can package text in three different formats
|
|
# "runs": [
|
|
# {"text": "something"},
|
|
# {"text": "cont"},
|
|
# ...
|
|
# ]
|
|
#
|
|
# "SimpleText": "something"
|
|
#
|
|
# Or sometimes just none at all as with the data returned from
|
|
# category continuations.
|
|
#
|
|
# In order to facilitate calling this function with `#[]?`:
|
|
# A nil will be accepted. Of course, since nil cannot be parsed,
|
|
# another nil will be returned.
|
|
def extract_text(item : JSON::Any?) : String?
|
|
if item.nil?
|
|
return nil
|
|
end
|
|
|
|
if text_container = item["simpleText"]?
|
|
return text_container.as_s
|
|
elsif text_container = item["runs"]?
|
|
return text_container.as_a.map(&.["text"].as_s).join("")
|
|
else
|
|
nil
|
|
end
|
|
end
|
|
|
|
# Parses an item from Youtube's JSON response into a more usable structure.
|
|
# The end result can either be a SearchVideo, SearchPlaylist or SearchChannel.
|
|
def extract_item(item : JSON::Any, author_fallback : String? = "",
|
|
author_id_fallback : String? = "")
|
|
# We "allow" nil values but secretly use empty strings instead. This is to save us the
|
|
# hassle of modifying every author_fallback and author_id_fallback arg usage
|
|
# which is more often than not nil.
|
|
author_fallback = AuthorFallback.new(author_fallback || "", author_id_fallback || "")
|
|
|
|
# Cycles through all of the item parsers and attempt to parse the raw YT JSON data.
|
|
# Each parser automatically validates the data given to see if the data is
|
|
# applicable to itself. If not nil is returned and the next parser is attemped.
|
|
ITEM_PARSERS.each do |parser|
|
|
LOGGER.trace("extract_item: Attempting to parse item using \"#{parser.parser_name}\" (cycling...)")
|
|
|
|
if result = parser.process(item, author_fallback)
|
|
LOGGER.debug("extract_item: Successfully parsed via #{parser.parser_name}")
|
|
|
|
return result
|
|
else
|
|
LOGGER.trace("extract_item: Parser \"#{parser.parser_name}\" does not apply. Cycling to the next one...")
|
|
end
|
|
end
|
|
end
|
|
|
|
# Parses multiple items from YouTube's initial JSON response into a more usable structure.
|
|
# The end result is an array of SearchItem.
|
|
def extract_items(initial_data : Hash(String, JSON::Any), author_fallback : String? = nil,
|
|
author_id_fallback : String? = nil) : Array(SearchItem)
|
|
items = [] of SearchItem
|
|
|
|
if unpackaged_data = initial_data["contents"]?.try &.as_h
|
|
elsif unpackaged_data = initial_data["response"]?.try &.as_h
|
|
elsif unpackaged_data = initial_data.dig?("onResponseReceivedActions", 0).try &.as_h
|
|
else
|
|
unpackaged_data = initial_data
|
|
end
|
|
|
|
# This is identical to the parser cycling of extract_item().
|
|
ITEM_CONTAINER_EXTRACTOR.each do |extractor|
|
|
LOGGER.trace("extract_items: Attempting to extract item container using \"#{extractor.extractor_name}\" (cycling...)")
|
|
|
|
if container = extractor.process(unpackaged_data)
|
|
LOGGER.debug("extract_items: Successfully unpacked container with \"#{extractor.extractor_name}\"")
|
|
# Extract items in container
|
|
container.each do |item|
|
|
if parsed_result = extract_item(item, author_fallback, author_id_fallback)
|
|
items << parsed_result
|
|
end
|
|
end
|
|
|
|
break
|
|
else
|
|
LOGGER.trace("extract_items: Extractor \"#{extractor.extractor_name}\" does not apply. Cycling to the next one...")
|
|
end
|
|
end
|
|
|
|
return items
|
|
end
|