300 行
8.0 KiB
Crystal
300 行
8.0 KiB
Crystal
struct PlaylistVideo
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def to_json(locale, config, kemal_config, json : JSON::Builder)
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json.object do
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json.field "title", self.title
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json.field "videoId", self.id
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json.field "author", self.author
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json.field "authorId", self.ucid
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json.field "authorUrl", "/channel/#{self.ucid}"
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json.field "videoThumbnails" do
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generate_thumbnails(json, self.id, config, kemal_config)
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end
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json.field "index", self.index
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json.field "lengthSeconds", self.length_seconds
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end
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end
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def to_json(locale, config, kemal_config, json : JSON::Builder | Nil = nil)
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if json
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to_json(locale, config, kemal_config, json)
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else
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JSON.build do |json|
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to_json(locale, config, kemal_config, json)
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end
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end
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end
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db_mapping({
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title: String,
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id: String,
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author: String,
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ucid: String,
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length_seconds: Int32,
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published: Time,
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plid: String,
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index: Int32,
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live_now: Bool,
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})
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end
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struct Playlist
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db_mapping({
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title: String,
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id: String,
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author: String,
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author_thumbnail: String,
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ucid: String,
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description_html: String,
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video_count: Int32,
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views: Int64,
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updated: Time,
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thumbnail: String?,
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})
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end
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def fetch_playlist_videos(plid, page, video_count, continuation = nil, locale = nil)
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client = make_client(YT_URL)
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if continuation
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html = client.get("/watch?v=#{continuation}&list=#{plid}&gl=US&hl=en&disable_polymer=1&has_verified=1&bpctr=9999999999")
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html = XML.parse_html(html.body)
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index = html.xpath_node(%q(//span[@id="playlist-current-index"])).try &.content.to_i?
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if index
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index -= 1
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end
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index ||= 0
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else
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index = (page - 1) * 100
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end
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if video_count > 100
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url = produce_playlist_url(plid, index)
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response = client.get(url)
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response = JSON.parse(response.body)
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if !response["content_html"]? || response["content_html"].as_s.empty?
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raise translate(locale, "Empty playlist")
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end
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document = XML.parse_html(response["content_html"].as_s)
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nodeset = document.xpath_nodes(%q(.//tr[contains(@class, "pl-video")]))
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videos = extract_playlist(plid, nodeset, index)
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else
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# Playlist has less than one page of videos, so subsequent pages will be empty
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if page > 1
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videos = [] of PlaylistVideo
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else
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# Extract first page of videos
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response = client.get("/playlist?list=#{plid}&gl=US&hl=en&disable_polymer=1")
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document = XML.parse_html(response.body)
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nodeset = document.xpath_nodes(%q(.//tr[contains(@class, "pl-video")]))
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videos = extract_playlist(plid, nodeset, 0)
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if continuation
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until videos[0].id == continuation
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videos.shift
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end
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end
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end
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end
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return videos
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end
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def extract_playlist(plid, nodeset, index)
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videos = [] of PlaylistVideo
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nodeset.each_with_index do |video, offset|
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anchor = video.xpath_node(%q(.//td[@class="pl-video-title"]))
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if !anchor
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next
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end
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title = anchor.xpath_node(%q(.//a)).not_nil!.content.strip(" \n")
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id = anchor.xpath_node(%q(.//a)).not_nil!["href"].lchop("/watch?v=")[0, 11]
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anchor = anchor.xpath_node(%q(.//div[@class="pl-video-owner"]/a))
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if anchor
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author = anchor.content
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ucid = anchor["href"].split("/")[2]
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else
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author = ""
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ucid = ""
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end
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anchor = video.xpath_node(%q(.//td[@class="pl-video-time"]/div/div[1]))
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if anchor && !anchor.content.empty?
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length_seconds = decode_length_seconds(anchor.content)
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live_now = false
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else
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length_seconds = 0
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live_now = true
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end
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videos << PlaylistVideo.new(
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title: title,
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id: id,
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author: author,
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ucid: ucid,
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length_seconds: length_seconds,
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published: Time.utc,
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plid: plid,
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index: index + offset,
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live_now: live_now
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)
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end
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return videos
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end
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def produce_playlist_url(id, index)
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if id.starts_with? "UC"
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id = "UU" + id.lchop("UC")
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end
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ucid = "VL" + id
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data = IO::Memory.new
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data.write_byte 0x08
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VarInt.to_io(data, index)
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data.rewind
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data = Base64.urlsafe_encode(data, false)
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data = "PT:#{data}"
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continuation = IO::Memory.new
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continuation.write_byte 0x7a
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VarInt.to_io(continuation, data.bytesize)
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continuation.print data
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data = Base64.urlsafe_encode(continuation)
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cursor = URI.escape(data)
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data = IO::Memory.new
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data.write_byte 0x12
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VarInt.to_io(data, ucid.bytesize)
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data.print ucid
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data.write_byte 0x1a
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VarInt.to_io(data, cursor.bytesize)
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data.print cursor
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data.rewind
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buffer = IO::Memory.new
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buffer.write Bytes[0xe2, 0xa9, 0x85, 0xb2, 0x02]
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VarInt.to_io(buffer, data.bytesize)
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IO.copy data, buffer
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continuation = Base64.urlsafe_encode(buffer)
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continuation = URI.escape(continuation)
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url = "/browse_ajax?continuation=#{continuation}&gl=US&hl=en"
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return url
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end
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def fetch_playlist(plid, locale)
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client = make_client(YT_URL)
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if plid.starts_with? "UC"
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plid = "UU#{plid.lchop("UC")}"
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end
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response = client.get("/playlist?list=#{plid}&hl=en&disable_polymer=1")
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if response.status_code != 200
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raise translate(locale, "Not a playlist.")
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end
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body = response.body.gsub(/<button[^>]+><span[^>]+>\s*less\s*<img[^>]+>\n<\/span><\/button>/, "")
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document = XML.parse_html(body)
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title = document.xpath_node(%q(//h1[@class="pl-header-title"]))
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if !title
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raise translate(locale, "Playlist does not exist.")
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end
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title = title.content.strip(" \n")
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description_html = document.xpath_node(%q(//span[@class="pl-header-description-text"]/div/div[1])).try &.to_s ||
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document.xpath_node(%q(//span[@class="pl-header-description-text"])).try &.to_s || ""
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playlist_thumbnail = document.xpath_node(%q(//div[@class="pl-header-thumb"]/img)).try &.["data-thumb"]? ||
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document.xpath_node(%q(//div[@class="pl-header-thumb"]/img)).try &.["src"]
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# YouTube allows anonymous playlists, so most of this can be empty or optional
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anchor = document.xpath_node(%q(//ul[@class="pl-header-details"]))
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author = anchor.try &.xpath_node(%q(.//li[1]/a)).try &.content
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author ||= ""
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author_thumbnail = document.xpath_node(%q(//img[@class="channel-header-profile-image"])).try &.["src"]
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author_thumbnail ||= ""
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ucid = anchor.try &.xpath_node(%q(.//li[1]/a)).try &.["href"].split("/")[-1]
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ucid ||= ""
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video_count = anchor.try &.xpath_node(%q(.//li[2])).try &.content.gsub(/\D/, "").to_i?
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video_count ||= 0
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views = anchor.try &.xpath_node(%q(.//li[3])).try &.content.gsub(/\D/, "").to_i64?
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views ||= 0_i64
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updated = anchor.try &.xpath_node(%q(.//li[4])).try &.content.lchop("Last updated on ").lchop("Updated ").try { |date| decode_date(date) }
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updated ||= Time.utc
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playlist = Playlist.new(
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title: title,
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id: plid,
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author: author,
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author_thumbnail: author_thumbnail,
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ucid: ucid,
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description_html: description_html,
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video_count: video_count,
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views: views,
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updated: updated,
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thumbnail: playlist_thumbnail,
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)
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return playlist
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end
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def template_playlist(playlist)
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html = <<-END_HTML
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<h3>
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<a href="/playlist?list=#{playlist["playlistId"]}">
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#{playlist["title"]}
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</a>
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</h3>
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<div class="pure-menu pure-menu-scrollable playlist-restricted">
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<ol class="pure-menu-list">
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END_HTML
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playlist["videos"].as_a.each do |video|
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html += <<-END_HTML
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<li class="pure-menu-item">
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<a href="/watch?v=#{video["videoId"]}&list=#{playlist["playlistId"]}">
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<div class="thumbnail">
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<img class="thumbnail" src="/vi/#{video["videoId"]}/mqdefault.jpg">
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<p class="length">#{recode_length_seconds(video["lengthSeconds"].as_i)}</p>
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</div>
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<p style="width:100%">#{video["title"]}</p>
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<p>
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<b style="width:100%">#{video["author"]}</b>
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</p>
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</a>
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</li>
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END_HTML
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end
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html += <<-END_HTML
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</ol>
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</div>
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<hr>
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END_HTML
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html
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end
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