Module: YoutubeVideoId

Defined in:
lib/youtube_video_id/version.rb,
lib/youtube_video_id/youtube_video_id_extractor.rb

Constant Summary collapse

VERSION = 
"0.1.0"

Class Method Summary collapse

Class Method Details

.extract(url) ⇒ Object 


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# File 'lib/youtube_video_id/youtube_video_id_extractor.rb', line 2

def self.extract(url)
  return '' unless /(?:youtu\.be\/|youtube\.com\/(?:(?:watch)?\?(?:.*&)?v(?:i)?=|(?:embed|v|user)\/))([^\?&\"'>]+)/.match(url)

  # Special case for URLs that look similar to this: https://www.youtube.com/user/SomeChannel#p/a/u/1/YQHsXMglC9A
  if /user/.match(url)
    youtube_video_id = url.strip[-11..-1]
    return self.youtube_video_id_is_valid?(youtube_video_id) ? youtube_video_id : ''
  end

  delimiter = ''
  if /\?v=/.match(url) # There has to be a differentiation between "?v=" and "&v=". See "Test case A"
    delimiter = '?v='
  elsif /&v=/.match(url)
    delimiter = '&v='
  elsif /v\//.match(url)
    delimiter = 'v/'
  elsif /embed/.match(url)
    delimiter = 'embed/'
  elsif /youtu.be/.match(url)
    delimiter = 'youtu.be/'
  else
    return ''
  end

  # Remove everything before the delimiter and the delimiter itself
  # The video ID and possibly some parameters remain.
  # Remove those parameters by selecting the right range of characters
  youtube_video_id = (url.split(delimiter)[1])[0...11]

  self.youtube_video_id_is_valid?(youtube_video_id) ? youtube_video_id : ''
end

.youtube_video_id_is_valid?(youtube_video_id) ⇒ Boolean

Returns:

  • (Boolean) 

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# File 'lib/youtube_video_id/youtube_video_id_extractor.rb', line 34

def self.youtube_video_id_is_valid?(youtube_video_id)
  # Check if the ID can possibly be valid or not (based on length and allowed characters)
  return false if youtube_video_id.length != 11
  /[a-zA-Z0-9_-]{11}/.match(youtube_video_id) ? true : false
end