VLC: Youtube Playlist Parser

youtube_playlist.lua

--[[
 Youtube playlist parser for VLC media player v1.0.2
 Copyright © 2021 Daniel Mendes

 Author: Daniel Mendes
 Contact: [email protected]

 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
--]]
 
-- Helper function to get a parameter's value in a URL
function get_url_param( url, name )
    local _, _, res = string.find( url, "[&?]"..name.."=([^&]*)" )
    return res
end

-- Helper emulating vlc.readline() to work around its failure on
-- very long lines (see #24957)
function read_long_line()
    local eol
    local pos = 0
    local len = 32768
    repeat
        len = len * 2
        local line = vlc.peek( len )
        if not line then return nil end
        eol = string.find( line, "\n", pos + 1 )
        pos = len
    until eol or len >= 1024 * 1024 -- No EOF detection, loop until limit
    return vlc.read( eol or len )
end

-- Unescape Hexadecimal representation
function unescape (s)
    s = string.gsub(s or '', "\\x(%x%x)", function (h) return string.char(tonumber(h,16)) end)
    return s
end

-- convert a duration to seconds
function durationInSeconds(duration)
    local hour, min, sec = string.match(duration, "(%d?%d?):?(%d?%d):(%d%d)")

    if hour == "" then
       hour = 0
    end

    if min == "" then
        min = 0
    end

    if sec == "" then
        sec = 0
    end

    return hour*60*60 + min*60 + sec
end

-- Probe function.
function probe()
    if vlc.access == "http" and vlc.access == "https" then
        return false
    end

    return ( ( vlc.access == "http" or vlc.access == "https" ) and (
        ((
            string.match( vlc.path, "^www%.youtube%.com/" )
        or string.match( vlc.path, "^music%.youtube%.com/" ) -- out of use
         ) and (
            string.match(vlc.path, "[?&]list=") -- video page with playlist
        or string.match( vlc.path, "/playlist%?" ) -- playlist page
         )) or
            string.match( vlc.path, "^consent%.youtube%.com/" )
     ) )
end

-- Parse function.
function parse()
    if string.match( vlc.path, "^consent%.youtube%.com/" ) then
        vlc.msg.info("type: consent.youtube.com")

        -- Cookie consent redirection
        -- Location: https://consent.youtube.com/m?continue=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DXXXXXXXXXXX&gl=FR&m=0&pc=yt&uxe=23983172&hl=fr&src=1
        -- Set-Cookie: CONSENT=PENDING+355; expires=Fri, 01-Jan-2038 00:00:00 GMT; path=/; domain=.youtube.com
        
        local url = get_url_param( vlc.path, "continue" )

        if not url then
            vlc.msg.err( "Couldn't handle YouTube cookie consent redirection, please check for updates to this script or try disabling HTTP cookie forwarding" )
            return { }
        end

        return { { path = vlc.strings.decode_uri( url ), options = { ":no-http-forward-cookies" } } }
    elseif string.match( vlc.path, "^www.youtube.com/playlist%?list=" ) then
        vlc.msg.info("type: youtube.com/playlist?list=")

        local playlist = {}
        local item, lines, line
        local index = 1
        local playlistID = get_url_param( vlc.path, "list" )

        while true do
            lines = ""
            line = ""

            while line do
                lines = lines..line
                line = read_long_line()
                if not line then break end
            end
           
            if string.match(lines, 'var ytInitialData = ') then
                local index_start, index_end, group1, group2, group3 = string.find(lines, '(var ytInitialData = )(.*)(;</script><link rel=)')
                local json = require('dkjson')

                local jsonParsed = json.decode (group2)

                for key, video in ipairs(jsonParsed.contents.twoColumnBrowseResultsRenderer.tabs[1].tabRenderer.content.sectionListRenderer.contents[1].itemSectionRenderer.contents[1].playlistVideoListRenderer.contents) do
                    item = nil
                    item = {}

                     -- If continuation playlist
                    if video.continuationItemRenderer then
                       
                    else
                        item.path = "https://www.youtube.com/watch?v="..video.playlistVideoRenderer.videoId
                        item.title = video.playlistVideoRenderer.title.runs[1].text
                        item.duration = video.playlistVideoRenderer.lengthSeconds
                        item.author = video.playlistVideoRenderer.shortBylineText.runs[1].text
                        item.arturl = video.playlistVideoRenderer.thumbnail.thumbnails[3].url
                        
                        table.insert (playlist, item)
                    end
                end

                return playlist
            end
        end
    elseif string.match(vlc.path, "(www.youtube.com/watch?).*([?&]list=)") then
        vlc.msg.info("type: youtube.com/watch?list=")

        local playlist = {}
        local item, lines, line
        local index = 1
        local playlistID = get_url_param( vlc.path, "list" )
        local videoID = get_url_param( vlc.path, "v" )

        while true do
            lines = ""
            line = ""

            while line do
                lines = lines..line
                line = read_long_line()
                if not line then break end
            end

            if string.match(lines, 'var ytInitialData = ') then
                local index_start, index_end, group1, group2, group3 = string.find(lines, '(var ytInitialData = )(.*)(;</script><script nonce=")')

                local json = require('dkjson')

                local jsonParsed = json.decode (group2)

                for key, video in ipairs(jsonParsed.contents.twoColumnWatchNextResults.playlist.playlist.contents) do
                    item = nil
                    item = {}

                    item.path = "https://www.youtube.com/watch?v="..video.playlistPanelVideoRenderer.videoId
                    item.title = video.playlistPanelVideoRenderer.title.simpleText
                    item.duration =  durationInSeconds(video.playlistPanelVideoRenderer.lengthText.simpleText)
                    item.author = video.playlistPanelVideoRenderer.shortBylineText.runs[1].text
                    item.arturl = video.playlistPanelVideoRenderer.thumbnail.thumbnails[4].url
                    
                    table.insert (playlist, item)
                end

                return playlist
            end
        end
    elseif string.match( vlc.path, "^music%.youtube%.com/playlist%?list=" ) then
        vlc.msg.info("type: music.youtube.com/playlist?list=")

    elseif string.match(vlc.path, "(music.youtube.com/watch?).*([?&]list=)") then
        vlc.msg.info("type: music.youtube.com/watch?list=")
    end
end

From what I can see, this code can't identify Youtube Music links, if anyone is wanting this, I came up with a silly "trick" that worked for me, just remove the "music." from the beginning of the link.