mirror of
https://github.com/discourse/discourse.git
synced 2024-11-25 09:42:07 +08:00
2f28ba318c
* FEATURE: Onebox can match engines based on the content_type `FinalDestination` now returns the `content_type` of a resolved URL. `Oneboxer` passes this value to `Onebox` itself. Onebox engines can now specify a `matches_content_type` regex of content_types that the engine can handle, regardless of the URL. `ImageOnebox` will match URLs with a content type of `image/png`, `jpg`, `gif`, `bmp`, `tif`, etc. This will allow images that exist at a URL without a file type extension to be correctly rendered, assuming a valid `content_type` is returned.
567 lines
18 KiB
Ruby
567 lines
18 KiB
Ruby
# frozen_string_literal: true
|
|
|
|
require 'uri'
|
|
|
|
Dir["#{Rails.root}/lib/onebox/engine/*_onebox.rb"].sort.each { |f| require f }
|
|
|
|
module Oneboxer
|
|
ONEBOX_CSS_CLASS = "onebox"
|
|
AUDIO_REGEX = /^\.(mp3|og[ga]|opus|wav|m4[abpr]|aac|flac)$/i
|
|
VIDEO_REGEX = /^\.(mov|mp4|webm|m4v|3gp|ogv|avi|mpeg|ogv)$/i
|
|
|
|
# keep reloaders happy
|
|
unless defined? Oneboxer::Result
|
|
Result = Struct.new(:doc, :changed) do
|
|
def to_html
|
|
doc.to_html
|
|
end
|
|
|
|
def changed?
|
|
changed
|
|
end
|
|
end
|
|
end
|
|
|
|
def self.ignore_redirects
|
|
@ignore_redirects ||= ['http://www.dropbox.com', 'http://store.steampowered.com', 'http://vimeo.com', 'https://www.youtube.com', Discourse.base_url]
|
|
end
|
|
|
|
def self.amazon_domains
|
|
amazon_suffixes = %w(com com.br ca cn fr de in it co.jp com.mx nl pl sa sg es se com.tr ae co.uk)
|
|
amazon_suffixes.collect { |suffix| "https://www.amazon.#{suffix}" }
|
|
end
|
|
|
|
def self.force_get_hosts
|
|
hosts = []
|
|
hosts += SiteSetting.force_get_hosts.split('|').collect { |domain| "https://#{domain}" }
|
|
hosts += SiteSetting.cache_onebox_response_body_domains.split('|').collect { |domain| "https://www.#{domain}" }
|
|
hosts += amazon_domains
|
|
|
|
hosts.uniq
|
|
end
|
|
|
|
def self.force_custom_user_agent_hosts
|
|
SiteSetting.force_custom_user_agent_hosts.split('|')
|
|
end
|
|
|
|
def self.allowed_post_types
|
|
@allowed_post_types ||= [Post.types[:regular], Post.types[:moderator_action]]
|
|
end
|
|
|
|
def self.preview(url, options = nil)
|
|
options ||= {}
|
|
invalidate(url) if options[:invalidate_oneboxes]
|
|
onebox_raw(url, options)[:preview]
|
|
end
|
|
|
|
def self.onebox(url, options = nil)
|
|
options ||= {}
|
|
invalidate(url) if options[:invalidate_oneboxes]
|
|
onebox_raw(url, options)[:onebox]
|
|
end
|
|
|
|
def self.cached_onebox(url)
|
|
if c = Discourse.cache.read(onebox_cache_key(url))
|
|
c[:onebox]
|
|
end
|
|
rescue => e
|
|
invalidate(url)
|
|
Rails.logger.warn("invalid cached onebox for #{url} #{e}")
|
|
""
|
|
end
|
|
|
|
def self.cached_preview(url)
|
|
if c = Discourse.cache.read(onebox_cache_key(url))
|
|
c[:preview]
|
|
end
|
|
rescue => e
|
|
invalidate(url)
|
|
Rails.logger.warn("invalid cached preview for #{url} #{e}")
|
|
""
|
|
end
|
|
|
|
def self.invalidate(url)
|
|
Discourse.cache.delete(onebox_cache_key(url))
|
|
Discourse.cache.delete(onebox_failed_cache_key(url))
|
|
end
|
|
|
|
def self.cache_response_body?(uri)
|
|
uri = URI.parse(uri) if uri.is_a?(String)
|
|
|
|
if SiteSetting.cache_onebox_response_body?
|
|
SiteSetting.cache_onebox_response_body_domains.split("|").any? { |domain| uri.hostname.ends_with?(domain) }
|
|
end
|
|
end
|
|
|
|
def self.cache_response_body(uri, response)
|
|
key = redis_cached_response_body_key(uri)
|
|
Discourse.redis.without_namespace.setex(key, 1.minutes.to_i, response)
|
|
end
|
|
|
|
def self.cached_response_body_exists?(uri)
|
|
key = redis_cached_response_body_key(uri)
|
|
Discourse.redis.without_namespace.exists(key).to_i > 0
|
|
end
|
|
|
|
def self.fetch_cached_response_body(uri)
|
|
key = redis_cached_response_body_key(uri)
|
|
Discourse.redis.without_namespace.get(key)
|
|
end
|
|
|
|
def self.redis_cached_response_body_key(uri)
|
|
"CACHED_RESPONSE_#{uri}"
|
|
end
|
|
|
|
# Parse URLs out of HTML, returning the document when finished.
|
|
def self.each_onebox_link(doc, extra_paths: [])
|
|
onebox_links = doc.css("a.#{ONEBOX_CSS_CLASS}", *extra_paths)
|
|
if onebox_links.present?
|
|
onebox_links.each do |link|
|
|
yield(link['href'], link) if link['href'].present?
|
|
end
|
|
end
|
|
|
|
doc
|
|
end
|
|
|
|
HTML5_BLOCK_ELEMENTS ||= %w{address article aside blockquote canvas center dd div dl dt fieldset figcaption figure footer form h1 h2 h3 h4 h5 h6 header hgroup hr li main nav noscript ol output p pre section table tfoot ul video}
|
|
|
|
def self.apply(string_or_doc, extra_paths: nil)
|
|
doc = string_or_doc
|
|
doc = Loofah.fragment(doc) if doc.is_a?(String)
|
|
changed = false
|
|
|
|
each_onebox_link(doc, extra_paths: extra_paths) do |url, element|
|
|
onebox, _ = yield(url, element)
|
|
next if onebox.blank?
|
|
|
|
parsed_onebox = Loofah.fragment(onebox)
|
|
next if parsed_onebox.children.blank?
|
|
|
|
changed = true
|
|
|
|
parent = element.parent
|
|
if parent&.node_name&.downcase == "p" &&
|
|
parsed_onebox.children.any? { |child| HTML5_BLOCK_ELEMENTS.include?(child.node_name.downcase) }
|
|
|
|
siblings = parent.children
|
|
element_idx = siblings.find_index(element)
|
|
before_idx = first_significant_element_index(siblings, element_idx - 1, -1)
|
|
after_idx = first_significant_element_index(siblings, element_idx + 1, +1)
|
|
|
|
if before_idx < 0 && after_idx >= siblings.size
|
|
parent.replace parsed_onebox
|
|
elsif before_idx < 0
|
|
parent.children = siblings[after_idx..siblings.size]
|
|
parent.add_previous_sibling(parsed_onebox)
|
|
elsif after_idx >= siblings.size
|
|
parent.children = siblings[0..before_idx]
|
|
parent.add_next_sibling(parsed_onebox)
|
|
else
|
|
parent_rest = parent.dup
|
|
|
|
parent.children = siblings[0..before_idx]
|
|
parent_rest.children = siblings[after_idx..siblings.size]
|
|
|
|
parent.add_next_sibling(parent_rest)
|
|
parent.add_next_sibling(parsed_onebox)
|
|
end
|
|
else
|
|
element.replace parsed_onebox
|
|
end
|
|
end
|
|
|
|
Result.new(doc, changed)
|
|
end
|
|
|
|
def self.first_significant_element_index(elements, index, step)
|
|
while index >= 0 && index < elements.size &&
|
|
(elements[index].node_name.downcase == "br" ||
|
|
(elements[index].node_name.downcase == "text" && elements[index].to_html.strip.blank?))
|
|
index = index + step
|
|
end
|
|
|
|
index
|
|
end
|
|
|
|
def self.is_previewing?(user_id)
|
|
Discourse.redis.get(preview_key(user_id)) == "1"
|
|
end
|
|
|
|
def self.preview_onebox!(user_id)
|
|
Discourse.redis.setex(preview_key(user_id), 1.minute, "1")
|
|
end
|
|
|
|
def self.onebox_previewed!(user_id)
|
|
Discourse.redis.del(preview_key(user_id))
|
|
end
|
|
|
|
def self.engine(url)
|
|
Onebox::Matcher.new(url, {
|
|
allowed_iframe_regexes: Onebox::Engine.origins_to_regexes(allowed_iframe_origins)
|
|
}).oneboxed
|
|
end
|
|
|
|
def self.recently_failed?(url)
|
|
Discourse.cache.read(onebox_failed_cache_key(url)).present?
|
|
end
|
|
|
|
def self.cache_failed!(url)
|
|
Discourse.cache.write(onebox_failed_cache_key(url), true, expires_in: 1.hour)
|
|
end
|
|
|
|
private
|
|
|
|
def self.preview_key(user_id)
|
|
"onebox:preview:#{user_id}"
|
|
end
|
|
|
|
def self.blank_onebox
|
|
{ preview: "", onebox: "" }
|
|
end
|
|
|
|
def self.onebox_cache_key(url)
|
|
"onebox__#{url}"
|
|
end
|
|
|
|
def self.onebox_failed_cache_key(url)
|
|
"onebox_failed__#{url}"
|
|
end
|
|
|
|
def self.onebox_raw(url, opts = {})
|
|
url = UrlHelper.escape_uri(url).to_s
|
|
local_onebox(url, opts) || external_onebox(url)
|
|
rescue => e
|
|
# no point warning here, just cause we have an issue oneboxing a url
|
|
# we can later hunt for failed oneboxes by searching logs if needed
|
|
Rails.logger.info("Failed to onebox #{url} #{e} #{e.backtrace}")
|
|
# return a blank hash, so rest of the code works
|
|
blank_onebox
|
|
end
|
|
|
|
def self.local_onebox(url, opts = {})
|
|
return unless route = Discourse.route_for(url)
|
|
|
|
html =
|
|
case route[:controller]
|
|
when "uploads" then local_upload_html(url)
|
|
when "topics" then local_topic_html(url, route, opts)
|
|
when "users" then local_user_html(url, route)
|
|
when "list" then local_category_html(url, route)
|
|
end
|
|
|
|
html = html.presence || "<a href='#{URI(url).to_s}'>#{URI(url).to_s}</a>"
|
|
{ onebox: html, preview: html }
|
|
end
|
|
|
|
def self.local_upload_html(url)
|
|
additional_controls = \
|
|
if SiteSetting.disable_onebox_media_download_controls
|
|
"controlslist='nodownload'"
|
|
else
|
|
""
|
|
end
|
|
|
|
case File.extname(URI(url).path || "")
|
|
when VIDEO_REGEX
|
|
<<~HTML
|
|
<div class="onebox video-onebox">
|
|
<video #{additional_controls} width="100%" height="100%" controls="">
|
|
<source src='#{url}'>
|
|
<a href='#{url}'>#{url}</a>
|
|
</video>
|
|
</div>
|
|
HTML
|
|
when AUDIO_REGEX
|
|
"<audio #{additional_controls} controls><source src='#{url}'><a href='#{url}'>#{url}</a></audio>"
|
|
end
|
|
end
|
|
|
|
def self.local_topic(url, route, opts)
|
|
if current_user = User.find_by(id: opts[:user_id])
|
|
if current_category = Category.find_by(id: opts[:category_id])
|
|
return unless Guardian.new(current_user).can_see_category?(current_category)
|
|
end
|
|
|
|
if current_topic = Topic.find_by(id: opts[:topic_id])
|
|
return unless Guardian.new(current_user).can_see_topic?(current_topic)
|
|
end
|
|
end
|
|
|
|
return unless topic = Topic.find_by(id: route[:id] || route[:topic_id])
|
|
return if topic.private_message?
|
|
|
|
if current_category.blank? || current_category.id != topic.category_id
|
|
return unless Guardian.new.can_see_topic?(topic)
|
|
end
|
|
|
|
topic
|
|
end
|
|
|
|
def self.local_topic_html(url, route, opts)
|
|
return unless topic = local_topic(url, route, opts)
|
|
|
|
post_number = route[:post_number].to_i
|
|
|
|
post = post_number > 1 ?
|
|
topic.posts.where(post_number: post_number).first :
|
|
topic.ordered_posts.first
|
|
|
|
return if !post || post.hidden || !allowed_post_types.include?(post.post_type)
|
|
|
|
if post_number > 1 && opts[:topic_id] == topic.id
|
|
excerpt = post.excerpt(SiteSetting.post_onebox_maxlength)
|
|
excerpt.gsub!(/[\r\n]+/, " ")
|
|
excerpt.gsub!("[/quote]", "[quote]") # don't break my quote
|
|
|
|
quote = "[quote=\"#{post.user.username}, topic:#{topic.id}, post:#{post.post_number}\"]\n#{excerpt}\n[/quote]"
|
|
|
|
PrettyText.cook(quote)
|
|
else
|
|
args = {
|
|
topic_id: topic.id,
|
|
post_number: post.post_number,
|
|
avatar: PrettyText.avatar_img(post.user.avatar_template, "tiny"),
|
|
original_url: url,
|
|
title: PrettyText.unescape_emoji(CGI::escapeHTML(topic.title)),
|
|
category_html: CategoryBadge.html_for(topic.category),
|
|
quote: PrettyText.unescape_emoji(post.excerpt(SiteSetting.post_onebox_maxlength)),
|
|
}
|
|
|
|
template = template("discourse_topic_onebox")
|
|
Mustache.render(template, args)
|
|
end
|
|
end
|
|
|
|
def self.local_user_html(url, route)
|
|
username = route[:username] || ""
|
|
|
|
if user = User.find_by(username_lower: username.downcase)
|
|
|
|
name = user.name if SiteSetting.enable_names
|
|
|
|
args = {
|
|
user_id: user.id,
|
|
username: user.username,
|
|
avatar: PrettyText.avatar_img(user.avatar_template, "extra_large"),
|
|
name: name,
|
|
bio: user.user_profile.bio_excerpt(230),
|
|
location: Onebox::Helpers.sanitize(user.user_profile.location),
|
|
joined: I18n.t('joined'),
|
|
created_at: user.created_at.strftime(I18n.t('datetime_formats.formats.date_only')),
|
|
website: user.user_profile.website,
|
|
website_name: UserSerializer.new(user).website_name,
|
|
original_url: url
|
|
}
|
|
|
|
Mustache.render(template("discourse_user_onebox"), args)
|
|
else
|
|
nil
|
|
end
|
|
end
|
|
|
|
def self.local_category_html(url, route)
|
|
return unless route[:category_slug_path_with_id]
|
|
category = Category.find_by_slug_path_with_id(route[:category_slug_path_with_id])
|
|
|
|
if Guardian.new.can_see_category?(category)
|
|
args = {
|
|
url: category.url,
|
|
name: category.name,
|
|
color: category.color,
|
|
logo_url: category.uploaded_logo&.url,
|
|
description: category.description,
|
|
has_subcategories: category.subcategories.present?,
|
|
subcategories: category.subcategories.collect { |sc| { name: sc.name, color: sc.color, url: sc.url } }
|
|
}
|
|
|
|
Mustache.render(template("discourse_category_onebox"), args)
|
|
end
|
|
end
|
|
|
|
def self.blocked_domains
|
|
SiteSetting.blocked_onebox_domains.split("|")
|
|
end
|
|
|
|
def self.preserve_fragment_url_hosts
|
|
@preserve_fragment_url_hosts ||= ['http://github.com']
|
|
end
|
|
|
|
def self.allowed_iframe_origins
|
|
allowed = SiteSetting.allowed_onebox_iframes.split("|")
|
|
if allowed.include?("*")
|
|
allowed = Onebox::Engine.all_iframe_origins
|
|
end
|
|
allowed += SiteSetting.allowed_iframes.split("|")
|
|
end
|
|
|
|
def self.external_onebox(url, available_strategies = nil)
|
|
Discourse.cache.fetch(onebox_cache_key(url), expires_in: 1.day) do
|
|
uri = URI(url)
|
|
available_strategies ||= Oneboxer.ordered_strategies(uri.hostname)
|
|
strategy = available_strategies.shift
|
|
|
|
fd = FinalDestination.new(url, get_final_destination_options(url, strategy))
|
|
uri = fd.resolve
|
|
|
|
if fd.status != :resolved
|
|
args = { link: url }
|
|
if fd.status == :invalid_address
|
|
args[:error_message] = I18n.t("errors.onebox.invalid_address", hostname: fd.hostname)
|
|
elsif (fd.status_code || uri.nil?) && available_strategies.present?
|
|
# Try a different oneboxing strategy, if we have any options left:
|
|
return external_onebox(url, available_strategies)
|
|
elsif fd.status_code
|
|
args[:error_message] = I18n.t("errors.onebox.error_response", status_code: fd.status_code)
|
|
end
|
|
|
|
error_box = blank_onebox
|
|
error_box[:preview] = preview_error_onebox(args)
|
|
return error_box
|
|
end
|
|
|
|
return blank_onebox if uri.blank? || blocked_domains.any? { |hostname| uri.hostname.match?(hostname) }
|
|
|
|
onebox_options = {
|
|
max_width: 695,
|
|
sanitize_config: Onebox::DiscourseOneboxSanitizeConfig::Config::DISCOURSE_ONEBOX,
|
|
allowed_iframe_origins: allowed_iframe_origins,
|
|
hostname: GlobalSetting.hostname,
|
|
facebook_app_access_token: SiteSetting.facebook_app_access_token,
|
|
disable_media_download_controls: SiteSetting.disable_onebox_media_download_controls,
|
|
body_cacher: self,
|
|
content_type: fd.content_type
|
|
}
|
|
|
|
onebox_options[:cookie] = fd.cookie if fd.cookie
|
|
|
|
user_agent_override = SiteSetting.cache_onebox_user_agent if Oneboxer.cache_response_body?(url) && SiteSetting.cache_onebox_user_agent.present?
|
|
onebox_options[:user_agent] = user_agent_override if user_agent_override
|
|
|
|
r = Onebox.preview(uri.to_s, onebox_options)
|
|
result = {
|
|
onebox: WordWatcher.censor(r.to_s),
|
|
preview: WordWatcher.censor(r&.placeholder_html.to_s)
|
|
}
|
|
|
|
# NOTE: Call r.errors after calling placeholder_html
|
|
if r.errors.any?
|
|
error_keys = r.errors.keys
|
|
skip_if_only_error = [:image]
|
|
unless error_keys.length == 1 && skip_if_only_error.include?(error_keys.first)
|
|
missing_attributes = error_keys.map(&:to_s).sort.join(I18n.t("word_connector.comma"))
|
|
error_message = I18n.t("errors.onebox.missing_data", missing_attributes: missing_attributes, count: error_keys.size)
|
|
args = r.verified_data.merge(error_message: error_message)
|
|
|
|
if result[:preview].blank?
|
|
result[:preview] = preview_error_onebox(args)
|
|
else
|
|
doc = Nokogiri::HTML5::fragment(result[:preview])
|
|
aside = doc.at('aside')
|
|
|
|
if aside
|
|
# Add an error message to the preview that was returned
|
|
error_fragment = preview_error_onebox_fragment(args)
|
|
aside.add_child(error_fragment)
|
|
result[:preview] = doc.to_html
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
Oneboxer.cache_preferred_strategy(uri.hostname, strategy)
|
|
|
|
result
|
|
end
|
|
end
|
|
|
|
def self.preview_error_onebox(args, is_fragment = false)
|
|
args[:title] ||= args[:link] if args[:link]
|
|
args[:error_message] = PrettyText.unescape_emoji(args[:error_message]) if args[:error_message]
|
|
|
|
template_name = is_fragment ? "preview_error_fragment_onebox" : "preview_error_onebox"
|
|
Mustache.render(template(template_name), args)
|
|
end
|
|
|
|
def self.preview_error_onebox_fragment(args)
|
|
preview_error_onebox(args, true)
|
|
end
|
|
|
|
def self.template(template_name)
|
|
@template_cache ||= {}
|
|
@template_cache[template_name] ||= begin
|
|
full_path = "#{Rails.root}/lib/onebox/templates/#{template_name}.mustache"
|
|
File.read(full_path)
|
|
end
|
|
end
|
|
|
|
def self.ordered_strategies(hostname)
|
|
all = strategies.keys
|
|
preferred = Oneboxer.preferred_strategy(hostname)
|
|
|
|
all.insert(0, all.delete(preferred)) if all.include?(preferred)
|
|
|
|
all
|
|
end
|
|
|
|
def self.strategies
|
|
{
|
|
default: {}, # don't override anything by default
|
|
force_get_and_ua: {
|
|
force_get_host: true,
|
|
force_custom_user_agent_host: true,
|
|
},
|
|
}
|
|
end
|
|
|
|
def self.cache_preferred_strategy(hostname, strategy)
|
|
return if strategy == :default
|
|
|
|
key = redis_oneboxer_strategy_key(hostname)
|
|
Discourse.redis.without_namespace.setex(key, 2.weeks.to_i, strategy.to_s)
|
|
end
|
|
|
|
def self.clear_preferred_strategy!(hostname)
|
|
key = redis_oneboxer_strategy_key(hostname)
|
|
Discourse.redis.without_namespace.del(key)
|
|
end
|
|
|
|
def self.preferred_strategy(hostname)
|
|
key = redis_oneboxer_strategy_key(hostname)
|
|
Discourse.redis.without_namespace.get(key)&.to_sym
|
|
end
|
|
|
|
def self.redis_oneboxer_strategy_key(hostname)
|
|
"ONEBOXER_STRATEGY_#{hostname}"
|
|
end
|
|
|
|
def self.get_final_destination_options(url, strategy = nil)
|
|
fd_options = {
|
|
ignore_redirects: ignore_redirects,
|
|
ignore_hostnames: blocked_domains,
|
|
force_get_hosts: force_get_hosts,
|
|
force_custom_user_agent_hosts: force_custom_user_agent_hosts,
|
|
preserve_fragment_url_hosts: preserve_fragment_url_hosts,
|
|
timeout: 5
|
|
}
|
|
|
|
uri = URI(url)
|
|
|
|
if strategy.blank?
|
|
strategy = Oneboxer.ordered_strategies(uri.hostname).shift
|
|
end
|
|
|
|
if strategy && Oneboxer.strategies[strategy][:force_get_host]
|
|
fd_options[:force_get_hosts] = ["https://#{uri.hostname}"]
|
|
end
|
|
if strategy && Oneboxer.strategies[strategy][:force_custom_user_agent_host]
|
|
fd_options[:force_custom_user_agent_hosts] = ["https://#{uri.hostname}"]
|
|
end
|
|
|
|
user_agent_override = SiteSetting.cache_onebox_user_agent if Oneboxer.cache_response_body?(url) && SiteSetting.cache_onebox_user_agent.present?
|
|
fd_options[:default_user_agent] = user_agent_override if user_agent_override
|
|
|
|
fd_options
|
|
end
|
|
end
|