Inst

#!/usr/bin/env ruby
require "json"
require "open-uri"
require "nokogiri"
require "net/http"
require "uri"
class Node
    attr_accessor :code,:video,:src
    def initialize(node_json)
        @code = node_json["code"]
        @video = node_json["is_video"]
        @src = node_json["display_src"]
    end
    def get_video
            page = fetch_page("https://instagram.com/p/#{@code}")
            return page["entry_data"]["PostPage"][0]["media"]["video_url"]
    end
end

class IGPage
    def initialize(json)
        @username = json["entry_data"]["ProfilePage"][0]["user"]["username"]
        @nodes = json["entry_data"]["ProfilePage"][0]["user"]["media"]["nodes"]
        @next_page = json["entry_data"]["ProfilePage"][0]["user"]["media"]["page_info"]["has_next_page"]
        @end = json["entry_data"]["ProfilePage"][0]["user"]["media"]["page_info"]["end_cursor"]
        @token = json["config"]["csrf_token"]
        @user_id = json["entry_data"]["ProfilePage"][0]["user"]["id"]
        Dir.mkdir @username unless File.exists? @username
    end
    def downloadPosts
        @nodes.each do |node|
            node = Node.new(node)
            if !node.video
                f = File.new("#{@username}/#{node.code}.jpg","w+")
                puts "Downloading #{node.src}"
                f << open(node.src).read
            else
                f =  File.new("#{@username}/#{node.code}.mp4","w+")
                puts "#Downloaing #{node.get_video}"
                f << open(node.get_video).read
            end
            f.close
            sleep 1
        end
        if @next_page
            get_next_page
        end
    end
    def get_next_page
        uri = URI.parse("https://www.instagram.com/query/")
        request = Net::HTTP::Post.new(uri)
        request.content_type = "application/x-www-form-urlencoded"
        request["User-Agent"] = "Mozilla/5.0 (X11; Linux i686; rv:47.0) Gecko/20100101 Firefox/47.0"
        request["Accept"] = "*/*"
        request["Accept-Language"] = "en-US,en;q=0.5"
        request["X-Csrftoken"] = @token
        request["X-Instagram-Ajax"] = "1"
        request["X-Requested-With"] = "XMLHttpRequest"
        request["Referer"] = "https://www.instagram.com/"
        request["Cookie"] = "csrftoken=#{@token};"
        request["Connection"] = "keep-alive"
        request.set_form_data(
          "q" => "ig_user(#{@user_id}) { media.after(#{@end}, 12) {
          count,
          nodes {
            caption,
            code,
            comments {
              count
            },
            comments_disabled,
            date,
            dimensions {
              height,
              width
            },
            display_src,
            id,
            is_video,
            likes {
              count
            },
            owner {
              id
            },
            thumbnail_src,
            video_views
          },
          page_info
        }
         }",
          "ref" => "users::show",
        )

        response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: uri.scheme == "https") do |http|
          http.request(request)
        end
        json = JSON.parse response.body
        if json["status"] == "ok"
            @nodes = json["media"]["nodes"]
            @end = json["media"]["page_info"]["end_cursor"]
            @next_page = json["media"]["page_info"]["has_next_page"]
            downloadPosts
        end
    end
end

def fetch_page(url)
    page = Nokogiri::HTML(open(url))
    body = page.search("script").select do |s|
        s.text =~ /window\._sharedData/
    end
    json = JSON.parse body.first.text.split(" = ").last[0...-1]
    return json
end
downloader = IGPage.new fetch_page(ARGV[0])
downloader.downloadPosts