This is Revigniter controller 'youtube.lc' from the domain 'rest.livecode.world'.

rest.livecode.world controller: youtube.lc

<?rev
   put "index,recentFirst,recentBullets,oldestFirst,recentMarkdown,oldestBullets,fetchAll,fetchThumb,transportAgain" into gControllerHandlers
   startUsingLibraries

    on index
       fedwiki_DeconstructDroppedURL $_POST_RAW, droppedURL, droppedHtml
       put youtube_ParseDropUrl (droppedURL) into pageJSON
       fedwiki_ReturnJSON pageJSON
    end index
    
    on transportAgain
       put $_POST_RAW into someJSON
       
       put json_ToArray (someJSON) into createArray
       put createArray ["title"] into sectionTitle
       put createArray ["create"]["source"] into sourceArray
       -- put createArray ["create"]["item"]["title"] into parentTitle
       if sourceArray is not an array then
          put fedwiki_ConstructErrorJSON ("This is not create JSON", "Error") into errorJSON
          fedwiki_ReturnJSON errorJSON
          return false
       end if
       
       put sourceArray ["transport"] into transportURL
       put sourceArray ["link_dictionary"] into linkDictionary
       
       put linkDictionary [sectionTitle] into snippetArray
       deconstruct_VideoSnippetArray snippetArray, videoTitle, videoDescription, videoID, thumbNailURL, publishedAt, positionPlusOneNum, tagArray, thumbNailWidth
       
       -- put "OrH6UMYAVsk" into videoID
       put youtube_FetchVideoPageJSON (videoID) into pageJSON
       fedwiki_ReturnJSON pageJSON
    end transportAgain
       
    on fetchThumb
       fedwiki_DeconstructDroppedURL $_POST_RAW, droppedURL, droppedHtml
       put youtube_ParseThumbUrl (droppedURL) into pageJSON
       fedwiki_ReturnJSON pageJSON
    end fetchThumb
       
    on fetchAll
       fedwiki_DeconstructDroppedURL $_POST_RAW, droppedURL, droppedHtml
       put youtube_ParseAllDropUrl (droppedURL) into pageJSON
       fedwiki_ReturnJSON pageJSON
    end fetchAll
       
    on recentMarkdown
       fedwiki_DeconstructDroppedURL $_POST_RAW, droppedURL, droppedHtml
       put youtube_ListAllDropUrl (droppedURL, "recentFirst", true, true) into pageJSON
       fedwiki_ReturnJSON pageJSON
    end recentMarkdown
       
    on oldestFirst
       fedwiki_DeconstructDroppedURL $_POST_RAW, droppedURL, droppedHtml
       put youtube_ListAllDropUrl (droppedURL, "oldestFirst") into pageJSON
       fedwiki_ReturnJSON pageJSON
    end oldestFirst
       
    on recentFirst
       fedwiki_DeconstructDroppedURL $_POST_RAW, droppedURL, droppedHtml
       put youtube_ListAllDropUrl (droppedURL, "recentFirst") into pageJSON
       fedwiki_ReturnJSON pageJSON
    end recentFirst
       
    on oldestBullets
       fedwiki_DeconstructDroppedURL $_POST_RAW, droppedURL, droppedHtml
       put youtube_ListAllDropUrl (droppedURL, "oldestFirst", false) into pageJSON
       fedwiki_ReturnJSON pageJSON
    end oldestBullets
       
    on recentBullets
       fedwiki_DeconstructDroppedURL $_POST_RAW, droppedURL, droppedHtml
       put youtube_ListAllDropUrl (droppedURL, "recentFirst", false) into pageJSON
       fedwiki_ReturnJSON pageJSON
    end recentBullets
    
    function youtube_ParseDropUrl droppedURL
       set the itemdelimiter to "/"
       put item 3 of droppedURL into youtubeBit
       put item 4 of droppedURL into switchOrArray
       put item 5 of droppedURL into extraBit
       
       if youtubeBit is not "www.youtube.com" then
          put youtube_FetchNextPageJson (droppedURL, droppedHtml) into pageJSON
          return pageJSON
       end if
       
       put 10 into pMaxResults
       put true into pDontLinkTitle
       
       set the itemdelimiter to "?"
       put item 1 of switchOrArray into switchBit
       switch switchBit
          case "playlist"
             -- https://www.youtube.com/playlist?list=PLPj3KCksGbSY-RaXfrGPnY8uEOl6uylky
             delete item 1 of switchOrArray
             split switchOrArray with "&" and "="
             put switchOrArray ["list"] into playlistID
             
             put "" into pPageTitle
             put youtube_FetchPlayListPageJson (playlistID, pPageTitle, pMaxResults, pDontLinkTitle) into someJSON
             return someJSON
          case "watch"
             -- https://www.youtube.com/watch?v=nU4Ggyobi3k&index=6&list=PLPj3KCksGbSY-RaXfrGPnY8uEOl6uylky
             delete item 1 of switchOrArray
             split switchOrArray with "&" and "="
             put switchOrArray ["v"] into videoID
             
             put youtube_FetchVideoPageJSON (videoID) into someJSON
             return someJSON
          case "channel"
             -- https://www.youtube.com/channel/UCR9gdpWisRwnk_k23GsHfcA
             put extraBit into channelID
             put youtube_FetchChannelUploadPageJson (channelID, pMaxResults, pDontLinkTitle) into someJSON
             fedwiki_ReturnJSON someJSON
             break
          case "user"
             put false into pDontLinkTitle
             put extraBit into userName
             put youtube_FetchUserUploadPageJson (userName, pMaxResults, pDontLinkTitle) into someJSON
             return someJSON
          default
             put "Not a link that I can parse." & CR & CR & dropJSON into someInfo
             put fedwiki_ConstructErrorJSON (someInfo) into someJSON
             return someJSON
       end switch
    end youtube_ParseDropUrl
    
    function youtube_ListAllDropUrl droppedURL, pDirection, pNumbered
       put false into pDontLinkTitle
       
       set the itemdelimiter to "/"
       put item 3 of droppedURL into youtubeBit
       put item 4 of droppedURL into switchOrArray
       put item 5 of droppedURL into extraBit
       
       set the itemdelimiter to "?"
       put item 1 of switchOrArray into switchBit
       switch switchBit
          case "user"
             put "Not done users yet for indexes" & CR & CR & dropJSON into someInfo
             put fedwiki_ConstructErrorJSON (someInfo) into someJSON
             return someJSON
          case "channel"
             put extraBit into channelID
             put youtube_FetchChannelIndexPageJson (channelID) into pageJSON
             return pageJSON
          case "playlist"
             delete item 1 of switchOrArray
             split switchOrArray with "&" and "="
             put switchOrArray ["list"] into playlistID
             
             put empty into pPageTitle
             put youtube_FetchPlayListIndexPageJson  (playlistID, pPageTitle, pDirection, pNumbered, droppedURL) into pageJSON
             return pageJSON
          default
             put "Not a link that I can parse." & CR & CR & dropJSON into someInfo
             put fedwiki_ConstructErrorJSON (someInfo) into someJSON
             return someJSON
       end switch
    end youtube_ListAllDropUrl
    
    function youtube_ParseAllDropUrl droppedURL
       put false into pDontLinkTitle
       
       set the itemdelimiter to "/"
       put item 3 of droppedURL into youtubeBit
       put item 4 of droppedURL into switchOrArray
       put item 5 of droppedURL into extraBit
       
       set the itemdelimiter to "?"
       put item 1 of switchOrArray into switchBit
       switch switchBit
          case "playlist"
             delete item 1 of switchOrArray
             split switchOrArray with "&" and "="
             put switchOrArray ["list"] into playlistID
             
             put "" into pPageTitle
             put youtube_FetchAllPlayListPageJson (playlistID, pPageTitle, pDontLinkTitle) into pageJSON
             return pageJSON
          case "channel"
             -- put wcn_GetChannelID() into channelID
             put extraBit into channelID
             put youtube_FetchAllChannelUploadPageJson (channelID, false) into someJSON
             return someJSON
          case "user"
             put extraBit into userName
             put youtube_FetchAllUserUploadPageJson (userName, pDontLinkTitle) into someJSON
             return someJSON
          case "watch" -- only one thing anyway
             delete item 1 of switchOrArray
             split switchOrArray with "&" and "="
             put switchOrArray ["v"] into videoID
             
             put youtube_FetchVideoPageJSON (videoID) into someJSON
             return someJSON
          default
             put "Not a link that I can parse." & CR & CR & dropJSON into someInfo
             put fedwiki_ConstructErrorJSON (someInfo) into someJSON
             return someJSON
       end switch
    end youtube_ParseAllDropUrl
    
    function youtube_ParseThumbUrl droppedURL
       set the itemdelimiter to "/"
       put item 3 of droppedURL into youtubeBit
       put item 4 of droppedURL into switchOrArray
       put item 5 of droppedURL into extraBit
       
       set the itemdelimiter to "?"
       put item 1 of switchOrArray into switchBit
       switch switchBit
          case "playlist"
             delete item 1 of switchOrArray
             split switchOrArray with "&" and "="
             put switchOrArray ["list"] into playlistID
             
             return pageJSON
          case "channel"
             put extraBit into channelID
             
             return pageJSON
          case "user"
             put extraBit into userName
             
             return someJSON
          case "watch" -- only one thing anyway
             delete item 1 of switchOrArray
             split switchOrArray with "&" and "="
             put switchOrArray ["v"] into videoID
             
             put youtube_FetchVideoThumbPageJSON (videoID) into someJSON
             return someJSON
          default
             put "Not a link that I can parse." & CR & CR & dropJSON into someInfo
             put fedwiki_ConstructErrorJSON (someInfo) into someJSON
             return someJSON
       end switch
    end youtube_ParseThumbUrl

    command startUsingLibraries
       start using stack (gAPPPATH & "stacks/lib_Audioboom.livecode")
       start using stack (gAPPPATH & "stacks/lib_CCC.livecode")
       start using stack (gAPPPATH & "stacks/lib_Embedly.livecode")
       start using stack (gAPPPATH & "stacks/lib_Fedwiki.livecode")
       start using stack (gAPPPATH & "stacks/lib_FedWikiPedia.livecode")
       start using stack (gAPPPATH & "stacks/lib_MediaWiki.livecode")
       start using stack (gAPPPATH & "stacks/lib_Text.livecode")
       start using stack (gAPPPATH & "stacks/lib_XML.livecode")
       start using stack (gAPPPATH & "stacks/lib_Youtube.livecode")
    end startUsingLibraries
?>