discourse/app/services/inline_uploads.rb

326 lines
10 KiB
Ruby

# frozen_string_literal: true
require_dependency "pretty_text"
class InlineUploads
PLACEHOLDER = "__replace__"
PATH_PLACEHOLDER = "__replace_path__"
UPLOAD_REGEXP_PATTERN = "/original/(\\dX/(?:[a-f0-9]/)*[a-f0-9]{40}[a-zA-Z0-9.]*)"
private_constant :UPLOAD_REGEXP_PATTERN
def self.process(markdown, on_missing: nil)
markdown = markdown.dup
match_md_reference(markdown) do |match, src, replacement, index|
if upload = Upload.get_from_url(src)
markdown = markdown.sub(match, replacement.sub!(PATH_PLACEHOLDER, "__#{upload.sha1}__"))
end
end
cooked_fragment = Nokogiri::HTML::fragment(PrettyText.cook(markdown, disable_emojis: true))
link_occurences = []
cooked_fragment.traverse do |node|
if node.name == "img"
# Do nothing
elsif !(node.children.count == 1 && (node.children[0].name != "img" && node.children[0].children.blank?)) &&
!(node.name == "a" && node.children.count > 1 && !node_children_names(node).include?("img"))
next
end
if seen_link = matched_uploads(node).first
if (actual_link = (node.attributes["href"]&.value || node.attributes["src"]&.value))
link_occurences << { link: actual_link, is_valid: true }
elsif node.name != "p"
link_occurences << { link: actual_link, is_valid: false }
end
end
end
raw_matches = []
match_bbcode_img(markdown) do |match, src, replacement, index|
raw_matches << [match, src, replacement, index]
end
match_md_inline_img(markdown) do |match, src, replacement, index|
raw_matches << [match, src, replacement, index]
end
match_img(markdown) do |match, src, replacement, index|
raw_matches << [match, src, replacement, index]
end
match_anchor(markdown) do |match, href, replacement, index|
raw_matches << [match, href, replacement, index]
end
db = RailsMultisite::ConnectionManagement.current_db
regexps = [
/(https?:\/\/[a-zA-Z0-9\.\/-]+\/uploads\/#{db}#{UPLOAD_REGEXP_PATTERN})/,
]
if Discourse.store.external?
regexps << /((https?:)?#{SiteSetting.Upload.s3_base_url}#{UPLOAD_REGEXP_PATTERN})/
regexps << /(#{SiteSetting.Upload.s3_cdn_url}#{UPLOAD_REGEXP_PATTERN})/
end
regexps.each do |regexp|
indexes = Set.new
markdown.scan(/(\n{2,}|\A)#{regexp}$/) do |match|
if match[1].present?
extension = match[1].split(".")[-1].downcase
index = $~.offset(2)[0]
indexes << index
if FileHelper.supported_images.include?(extension)
raw_matches << [match[1], match[1], +"![](#{PLACEHOLDER})", index]
else
raw_matches << [match[1], match[1], +"#{Discourse.base_url}#{PATH_PLACEHOLDER}", index]
end
end
end
markdown.scan(/^#{regexp}(\s)/) do |match|
if match[0].present?
index = $~.offset(0)[0]
next if indexes.include?(index)
indexes << index
raw_matches << [
match[0],
match[0],
+"#{Discourse.base_url}#{PATH_PLACEHOLDER}",
$~.offset(0)[0]
]
end
end
markdown.scan(/\[[^\[\]]*\]: #{regexp}/) do |match|
if match[0].present?
index = $~.offset(1)[0]
next if indexes.include?(index)
indexes << index
end
end
markdown.scan(/(([\n\s\)\]\<])+)#{regexp}/) do |match|
if matched_uploads(match[2]).present?
next if indexes.include?($~.offset(3)[0])
raw_matches << [
match[2],
match[2],
+"#{Discourse.base_url}#{PATH_PLACEHOLDER}",
$~.offset(0)[0]
]
end
end
end
raw_matches
.sort { |a, b| a[3] <=> b[3] }
.each do |match, link, replace_with, _index|
node_info = link_occurences.shift
next unless node_info&.dig(:is_valid)
if link.include?(node_info[:link])
begin
uri = URI(link)
rescue URI::Error
end
if !Discourse.store.external?
host = uri&.host
hosts = [Discourse.current_hostname]
if cdn_url = GlobalSetting.cdn_url
hosts << URI(GlobalSetting.cdn_url).hostname
end
if host && !hosts.include?(host)
next
end
end
upload = Upload.get_from_url(link)
if upload
replace_with.sub!(PLACEHOLDER, upload.short_url)
replace_with.sub!(PATH_PLACEHOLDER, upload.short_path)
markdown.sub!(match, replace_with)
else
on_missing.call(link) if on_missing
end
end
end
markdown.scan(/(__([a-f0-9]{40})__)/) do |match|
upload = Upload.find_by(sha1: match[1])
markdown = markdown.sub(match[0], upload.short_path)
end
markdown
end
def self.match_md_inline_img(markdown, external_src: false)
markdown.scan(/(!?\[([^\[\]]*)\]\(([a-zA-z0-9\.\/:-]+)([ ]*['"]{1}[^\)]*['"]{1}[ ]*)?\))/) do |match|
if (matched_uploads(match[2]).present? || external_src) && block_given?
yield(
match[0],
match[2],
+"#{match[0].start_with?("!") ? "!" : ""}[#{match[1]}](#{PLACEHOLDER}#{match[3]})",
$~.offset(0)[0]
)
end
end
end
def self.match_bbcode_img(markdown, external_src: false)
markdown.scan(/(\[img\]\s*([^\[\]\s]+)\s*\[\/img\])/) do |match|
if (matched_uploads(match[1]).present? && block_given?) || external_src
yield(match[0], match[1], +"![](#{PLACEHOLDER})", $~.offset(0)[0])
end
end
end
def self.match_md_reference(markdown)
markdown.scan(/(\[([^\]]+)\]:([ ]+)(\S+))/) do |match|
if match[3] && matched_uploads(match[3]).present? && block_given?
yield(
match[0],
match[3],
+"[#{match[1]}]:#{match[2]}#{Discourse.base_url}#{PATH_PLACEHOLDER}",
$~.offset(0)[0]
)
end
end
end
def self.match_anchor(markdown, external_href: false)
markdown.scan(/((<a[^<]+>)([^<\a>]*?)<\/a>)/) do |match|
node = Nokogiri::HTML::fragment(match[0]).children[0]
href = node.attributes["href"]&.value
if href && (matched_uploads(href).present? || external_href)
has_attachment = node.attributes["class"]&.value
index = $~.offset(0)[0]
text = match[2].strip.gsub("\n", "").gsub(/ +/, " ")
text = "#{text}|attachment" if has_attachment
yield(match[0], href, +"[#{text}](#{PLACEHOLDER})", index) if block_given?
end
end
end
def self.match_img(markdown, external_src: false)
markdown.scan(/(([ ]*)<(?!img)[^<>]+\/?>)?([\r\n]*)(([ ]*)<img ([^>\n]+)>([ ]*))([\r\n]*)/) do |match|
node = Nokogiri::HTML::fragment(match[3].strip).children[0]
src = node.attributes["src"]&.value
if src && (matched_uploads(src).present? || external_src)
text = node.attributes["alt"]&.value
width = node.attributes["width"]&.value.to_i
height = node.attributes["height"]&.value.to_i
title = node.attributes["title"]&.value
text = "#{text}|#{width}x#{height}" if width > 0 && height > 0
after_html_tag = match[0].present?
spaces_before =
if after_html_tag && !match[0].end_with?("/>")
(match[4].length > 0 ? match[4] : " ")
else
""
end
replacement = +"#{spaces_before}![#{text}](#{PLACEHOLDER}#{title.present? ? " \"#{title}\"" : ""})"
if after_html_tag && (num_newlines = match[2].length) <= 1
replacement.prepend("\n" * (num_newlines == 0 ? 2 : 1))
end
if after_html_tag && !match[0].end_with?("/>") && (num_newlines = match[7].length) <= 1
replacement += ("\n" * (num_newlines == 0 ? 2 : 1))
end
match[3].strip! if !after_html_tag
if (match[1].nil? || match[1].length < 4)
if (match[4].nil? || match[4].length < 4)
yield(match[3], src, replacement, $~.offset(0)[0]) if block_given?
else
yield(match[3], src, match[3].sub(src, PATH_PLACEHOLDER), $~.offset(0)[0]) if block_given?
end
else
yield(match[3], src, match[3].sub(src, PATH_PLACEHOLDER), $~.offset(0)[0]) if block_given?
end
end
end
end
def self.matched_uploads(node)
matches = []
base_url = Discourse.base_url.sub(/https?:\/\//, "(https?://)")
if GlobalSetting.cdn_url
cdn_url = GlobalSetting.cdn_url.sub(/https?:\/\//, "(https?://)")
end
regexps = [
/(upload:\/\/([a-zA-Z0-9]+)[a-zA-Z0-9\.]*)/,
/(\/uploads\/short-url\/([a-zA-Z0-9]+)[a-zA-Z0-9\.]*)/,
/(#{base_url}\/uploads\/short-url\/([a-zA-Z0-9]+)[a-zA-Z0-9\.]*)/,
]
db = RailsMultisite::ConnectionManagement.current_db
if Discourse.store.external?
if Rails.configuration.multisite
regexps << /((https?:)?#{SiteSetting.Upload.s3_base_url}\/uploads\/#{db}#{UPLOAD_REGEXP_PATTERN})/
regexps << /(#{SiteSetting.Upload.s3_cdn_url}\/uploads\/#{db}#{UPLOAD_REGEXP_PATTERN})/
else
regexps << /((https?:)?#{SiteSetting.Upload.s3_base_url}#{UPLOAD_REGEXP_PATTERN})/
regexps << /(#{SiteSetting.Upload.s3_cdn_url}#{UPLOAD_REGEXP_PATTERN})/
regexps << /(\/uploads\/#{db}#{UPLOAD_REGEXP_PATTERN})/
regexps << /(#{base_url}\/uploads\/#{db}#{UPLOAD_REGEXP_PATTERN})/
regexps << /(#{cdn_url}\/uploads\/#{db}#{UPLOAD_REGEXP_PATTERN})/ if cdn_url
end
else
regexps << /(\/uploads\/#{db}#{UPLOAD_REGEXP_PATTERN})/
regexps << /(#{base_url}\/uploads\/#{db}#{UPLOAD_REGEXP_PATTERN})/
regexps << /(#{cdn_url}\/uploads\/#{db}#{UPLOAD_REGEXP_PATTERN})/ if cdn_url
end
node = node.to_s
regexps.each do |regexp|
node.scan(/(^|[\n\s"'\(>])#{regexp}($|[\n\s"'\)<])/) do |matched|
matches << matched[1]
end
end
matches
end
private_class_method :matched_uploads
def self.node_children_names(node, names = Set.new)
if node.children.blank?
names << node.name
return names
end
node.children.each do |child|
names = node_children_names(child, names)
end
names
end
private_class_method :node_children_names
end