458 lines
11 KiB
Crystal
458 lines
11 KiB
Crystal
macro add_mapping(mapping)
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def initialize({{*mapping.keys.map { |id| "@#{id}".id }}})
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end
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def to_a
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return [{{*mapping.keys.map { |id| "@#{id}".id }}}]
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end
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DB.mapping({{mapping}})
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end
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macro templated(filename)
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render "src/views/#{{{filename}}}.ecr", "src/views/layout.ecr"
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end
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class Config
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YAML.mapping({
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pool_size: Int32,
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threads: Int32,
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db: NamedTuple(
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user: String,
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password: String,
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host: String,
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port: Int32,
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dbname: String,
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),
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dl_api_key: String?,
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})
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end
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class Video
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module HTTPParamConverter
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def self.from_rs(rs)
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HTTP::Params.parse(rs.read(String))
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end
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end
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add_mapping({
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id: String,
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info: {
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type: HTTP::Params,
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default: HTTP::Params.parse(""),
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converter: Video::HTTPParamConverter,
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},
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updated: Time,
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title: String,
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views: Int64,
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likes: Int32,
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dislikes: Int32,
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wilson_score: Float64,
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published: Time,
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description: String,
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language: String?,
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})
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end
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class RedditSubmit
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JSON.mapping({
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data: RedditSubmitData,
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})
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end
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class RedditSubmitData
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JSON.mapping({
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children: Array(RedditThread),
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})
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end
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class RedditThread
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JSON.mapping({
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data: RedditThreadData,
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})
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end
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class RedditThreadData
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JSON.mapping({
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subreddit: String,
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id: String,
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num_comments: Int32,
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score: Int32,
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author: String,
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permalink: String,
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title: String,
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})
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end
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# See http://www.evanmiller.org/how-not-to-sort-by-average-rating.html
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def ci_lower_bound(pos, n)
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if n == 0
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return 0.0
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end
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# z value here represents a confidence level of 0.95
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z = 1.96
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phat = 1.0*pos/n
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return (phat + z*z/(2*n) - z * Math.sqrt((phat*(1 - phat) + z*z/(4*n))/n))/(1 + z*z/n)
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end
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def elapsed_text(elapsed)
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millis = elapsed.total_milliseconds
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return "#{millis.round(2)}ms" if millis >= 1
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"#{(millis * 1000).round(2)}µs"
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end
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def get_client(pool)
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while pool.empty?
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sleep rand(0..10).milliseconds
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end
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return pool.shift
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end
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def fetch_video(id, client)
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info = client.get("/get_video_info?video_id=#{id}&el=detailpage&ps=default&eurl=&gl=US&hl=en").body
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html = client.get("/watch?v=#{id}&bpctr=#{Time.new.epoch + 2000}").body
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html = XML.parse_html(html)
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info = HTTP::Params.parse(info)
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if info["reason"]?
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info = client.get("/get_video_info?video_id=#{id}&ps=default&eurl=&gl=US&hl=en").body
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info = HTTP::Params.parse(info)
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if info["reason"]?
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raise info["reason"]
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end
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end
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title = info["title"]
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views = info["view_count"].to_i64
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likes = html.xpath_node(%q(//button[@title="I like this"]/span))
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likes = likes.try &.content.delete(",").try &.to_i
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likes ||= 0
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dislikes = html.xpath_node(%q(//button[@title="I dislike this"]/span))
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dislikes = dislikes.try &.content.delete(",").try &.to_i
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dislikes ||= 0
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description = html.xpath_node(%q(//p[@id="eow-description"]))
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description = description ? description.to_xml : ""
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wilson_score = ci_lower_bound(likes, likes + dislikes)
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published = html.xpath_node(%q(//strong[contains(@class,"watch-time-text")]))
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if published
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published = published.content
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else
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raise "Could not find date published"
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end
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published = published.lchop("Published ")
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published = published.lchop("Started streaming ")
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published = published.lchop("Streamed live ")
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published = published.lchop("Uploaded ")
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published = published.lchop("on ")
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published = published.lchop("Scheduled for ")
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if !published.includes?("ago")
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published = Time.parse(published, "%b %-d, %Y")
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else
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# Time matches format "20 hours ago", "40 minutes ago"...
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delta = published.split(" ")[0].to_i
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case published
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when .includes? "minute"
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published = Time.now - delta.minutes
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when .includes? "hour"
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published = Time.now - delta.hours
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else
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raise "Could not parse #{published}"
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end
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end
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video = Video.new(id, info, Time.now, title, views, likes, dislikes, wilson_score, published, description, nil)
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return video
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end
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def get_video(id, client, db, refresh = true)
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if db.query_one?("SELECT EXISTS (SELECT true FROM videos WHERE id = $1)", id, as: Bool)
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video = db.query_one("SELECT * FROM videos WHERE id = $1", id, as: Video)
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# If record was last updated over an hour ago, refresh (expire param in response lasts for 6 hours)
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if refresh && Time.now - video.updated > 1.hours
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db.exec("DELETE FROM videos * WHERE id = $1", id)
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video = fetch_video(id, client)
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args = arg_array(video.to_a)
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db.exec("INSERT INTO videos VALUES (#{args})", video.to_a)
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end
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else
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video = fetch_video(id, client)
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args = arg_array(video.to_a)
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db.exec("INSERT INTO videos VALUES (#{args})", video.to_a)
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end
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return video
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end
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def search(query, client)
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html = client.get("https://www.youtube.com/results?q=#{query}&sp=EgIQAVAU").body
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html = XML.parse_html(html)
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html.xpath_nodes(%q(//ol[@class="item-section"]/li)).each do |item|
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root = item.xpath_node(%q(div[contains(@class,"yt-lockup-video")]/div))
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if root
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link = root.xpath_node(%q(div[contains(@class,"yt-lockup-thumbnail")]/a/@href))
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if link
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yield link.content.split("=")[1]
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end
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end
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end
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end
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def splice(a, b)
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c = a[0]
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a[0] = a[b % a.size]
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a[b % a.size] = c
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return a
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end
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def decrypt_signature(a)
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a = a.split("")
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a.reverse!
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a.delete_at(0)
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a.reverse!
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a = splice(a, 50)
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return a.join("")
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end
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def rank_videos(db, n, pool, filter)
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top = [] of {Float64, String}
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db.query("SELECT id, wilson_score, published FROM videos WHERE views > 5000 ORDER BY published DESC LIMIT 1000") do |rs|
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rs.each do
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id = rs.read(String)
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wilson_score = rs.read(Float64)
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published = rs.read(Time)
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# Exponential decay, older videos tend to rank lower
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temperature = wilson_score * Math.exp(-0.000005*((Time.now - published).total_minutes))
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top << {temperature, id}
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end
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end
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top.sort!
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# Make hottest come first
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top.reverse!
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top = top.map { |a, b| b }
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if filter
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language_list = [] of String
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top.each do |id|
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if language_list.size == n
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break
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else
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client = get_client(pool)
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video = get_video(id, client, db)
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pool << client
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if video.language
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language = video.language
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else
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description = XML.parse(video.description)
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content = [video.title, description.content].join(" ")
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content = content[0,1000]
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results = DetectLanguage.detect(content)
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language = results[0].language
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db.exec("UPDATE videos SET language = $1 WHERE id = $2", language, id)
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end
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if language == "en"
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language_list << id
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end
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end
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end
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return language_list
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else
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return top[0..n - 1]
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end
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end
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def make_client(url)
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context = OpenSSL::SSL::Context::Client.new
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context.add_options(
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OpenSSL::SSL::Options::ALL |
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OpenSSL::SSL::Options::NO_SSL_V2 |
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OpenSSL::SSL::Options::NO_SSL_V3
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)
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client = HTTP::Client.new(url, context)
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client.read_timeout = 10.seconds
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client.connect_timeout = 10.seconds
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return client
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end
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def get_reddit_comments(id, client, headers)
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query = "(url:3D#{id}%20OR%20url:#{id})%20(site:youtube.com%20OR%20site:youtu.be)"
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search_results = client.get("/search.json?q=#{query}", headers)
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if search_results.status_code == 200
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search_results = RedditSubmit.from_json(search_results.body)
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thread = search_results.data.children.sort_by { |child| child.data.score }[-1]
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result = client.get("/r/#{thread.data.subreddit}/comments/#{thread.data.id}?limit=100&sort=top", headers).body
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result = JSON.parse(result)
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elsif search_results.status_code == 302
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search_results = client.get(search_results.headers["Location"], headers).body
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result = JSON.parse(search_results)
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thread = RedditThread.from_json(result[0]["data"]["children"][0].to_json)
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else
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raise "Got error code #{search_results.status_code}"
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end
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comments = result[1]["data"]["children"]
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return comments, thread
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end
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def template_comments(root)
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html = ""
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root.each do |child|
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if child["data"]["body_html"]?
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author = child["data"]["author"]
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score = child["data"]["score"]
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body_html = HTML.unescape(child["data"]["body_html"].as_s)
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# Replace local links wtih links back to Reddit
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body_html = fill_links(body_html, "https", "www.reddit.com")
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replies_html = ""
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if child["data"]["replies"] != ""
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replies_html = template_comments(child["data"]["replies"]["data"]["children"])
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end
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content = <<-END_HTML
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<p>
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<a href="javascript:void(0)" onclick="toggle(this)">[ - ]</a> #{score} <b>#{author}</b>
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</p>
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<div>
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#{body_html}
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#{replies_html}
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</div>
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END_HTML
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if child["data"]["depth"].as_i > 0
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html += <<-END_HTML
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<div class="pure-g">
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<div class="pure-u-1-24"></div>
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<div class="pure-u-23-24">
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#{content}
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</div>
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</div>
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END_HTML
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else
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html += <<-END_HTML
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<div class="pure-g">
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<div class="pure-u-1">
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#{content}
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</div>
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</div>
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END_HTML
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end
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end
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end
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return html
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end
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def number_with_separator(number)
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number.to_s.reverse.gsub(/(\d{3})(?=\d)/, "\\1,").reverse
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end
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def arg_array(array)
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args = [] of String
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(1..array.size).each { |i| args << "($#{i})," }
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args = args.join("")
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args = args.chomp(",")
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return args
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end
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def add_alt_links(html)
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alt_links = [] of {Int32, String}
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# This is painful but is likely the only way to accomplish this in Crystal,
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# as Crystigiri and others are not able to insert XML Nodes into a document.
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# The goal here is to use as little regex as possible
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html.scan(/<a[^>]*>([^<]+)<\/a>/) do |match|
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anchor = XML.parse_html(match[0])
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anchor = anchor.xpath_node("//a").not_nil!
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url = URI.parse(HTML.unescape(anchor["href"]))
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if ["www.youtube.com", "m.youtube.com"].includes?(url.host) && url.path == "/watch"
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alt_link = <<-END_HTML
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<a href="#{url.full_path}">
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<i class="fa fa-link" aria-hidden="true"></i>
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</a>
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END_HTML
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elsif url.host == "youtu.be"
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alt_link = <<-END_HTML
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<a href="/watch?v=#{url.full_path.lchop("/")}">
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<i class="fa fa-link" aria-hidden="true"></i>
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</a>
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END_HTML
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else
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alt_link = ""
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end
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alt_links << {match.end.not_nil!, alt_link}
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end
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alt_links.reverse!
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alt_links.each do |position, alt_link|
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html = html.insert(position, alt_link)
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end
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return html
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end
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def fill_links(html, scheme, host)
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html = XML.parse_html(html)
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html.xpath_nodes("//a").each do |match|
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url = URI.parse(match["href"])
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if !url.host # If reddit link
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url.scheme = scheme
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url.host = host
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match["href"] = url
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end
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end
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html = html.to_xml
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end
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def login_req(login_form, f_req)
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data = {
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"pstMsg" => "1",
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"checkConnection" => "youtube",
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"checkedDomains" => "youtube",
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"hl" => "en",
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"deviceinfo" => %q([null,null,null,[],null,"US",null,null,[],"GlifWebSignIn",null,[null,null,[]]]),
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"f.req" => f_req,
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"flowName" => "GlifWebSignIn",
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"flowEntry" => "ServiceLogin",
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}
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data = data.merge(login_form)
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# pp data
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return HTTP::Params.encode(data)
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end
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