get_all_video_list.rb

require 'net/http'
require 'json'
require 'optparse'

class AllItems
  attr_reader :items

  def initialize(channel_id, api_key)
    @channel_id = channel_id
    @api_key = api_key
    @count = 0
    @items = []
    call_api
  end

  def call_api(page_token = nil)
    # https://developers.google.com/youtube/v3/docs/search/list?hl=ja
    uri = URI.parse 'https://www.googleapis.com/youtube/v3/search'
    params = {
      part: 'snippet',
      channelId: @channel_id,
      maxResults: '50',
      key: @api_key
    }
    params['pageToken'] = page_token unless page_token == nil
    uri.query = URI.encode_www_form(params)
    body = Net::HTTP.get uri
    @count = @count + 1
    ofname = sprintf('%s.%02d.json', @channel_id, @count)
    File.write(ofname, body)
    result = JSON.parse(body)
    result['items'].each do |item|
      next unless item['id']['kind'] == 'youtube#video'
      @items << item
    end
    call_api(result['nextPageToken']) if result.has_key?('nextPageToken')
  end
end

opts = {
  channel_id: '',
  api_key: ''
}
opt = OptionParser.new
opt.on('-c VAL') {|v| opts[:channel_id] = v }
opt.on('-k VAL') {|v| opts[:api_key] = v }
opt.parse!(ARGV)

items = {}
AllItems.new(opts[:channel_id], opts[:api_key]).items.each do |item|
  publish_time = item['snippet']['publishTime']
  items[publish_time] = item
end
items.sort.each do |publish_time, item|
  video_id = item['id']['videoId']
  title = item['snippet']['title']
  puts sprintf('* %s [%s](https://www.youtube.com/watch?v=%s)', publish_time, title, video_id)
end