discourse/app/services/inline_uploads.rb

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# frozen_string_literal: true
class InlineUploads
PLACEHOLDER = "__replace__"
PATH_PLACEHOLDER = "__replace_path__"
UPLOAD_REGEXP_PATTERN = "/original/(\\dX/(?:\\h/)*\\h{40}[a-zA-Z0-9.]*)(\\?v=\\d+)?"
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::HTML5.fragment(PrettyText.cook(markdown, disable_emojis: true))
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link_occurrences = []
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))
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link_occurrences << { link: actual_link, is_valid: true }
elsif node.name != "p"
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link_occurrences << { link: seen_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
regexps = [
%r{(https?://[a-zA-Z0-9\./-]+/#{Discourse.store.upload_path}#{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? && match[2].present?
extension = match[2].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.add?(index)
raw_matches << [match[0], match[0], +"#{Discourse.base_url}#{PATH_PLACEHOLDER}", index]
end
end
markdown.scan(/\[[^\[\]]*\]: #{regexp}/) do |match|
indexes.add($~.offset(1)[0]) if match[0].present?
end
markdown.scan(/(([\n\s\)\]\<])+)#{regexp}/) do |match|
if matched_uploads(match[2]).present?
next if !indexes.add?($~.offset(3)[0])
index = $~.offset(0)[0]
raw_matches << [match[2], match[2], +"#{Discourse.base_url}#{PATH_PLACEHOLDER}", index]
end
end
end
raw_matches
.sort { |a, b| a[3] <=> b[3] }
.each do |match, link, replace_with, _index|
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node_info = link_occurrences.shift
next unless node_info&.dig(:is_valid)
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if link.include?(node_info[:link])
begin
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uri = URI(link)
rescue URI::Error
end
if !Discourse.store.external?
host = uri&.host
hosts = [Discourse.current_hostname]
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if cdn_url = GlobalSetting.cdn_url
hosts << URI(GlobalSetting.cdn_url).hostname
end
next if host && !hosts.include?(host)
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(/(__(\h{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(/(!?\[([^\[\]]*)\]\(([^\s\)]+)([ ]*['"]{1}[^\)]*['"]{1}[ ]*)?\))/) do |match|
if (external_src || matched_uploads(match[2]).present?) && block_given?
yield(
match[0],
match[2],
+"#{match[0].start_with?("!") ? "!" : ""}[#{match[1]}](#{PLACEHOLDER}#{match[3]})",
$~.offset(0)[0]
)
end
end
end
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def self.match_bbcode_img(markdown, external_src: false)
markdown.scan(%r{(\[img\]\s*([^\[\]\s]+)\s*\[/img\])}i) do |match|
if (external_src || (matched_uploads(match[1]).present?)) && block_given?
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(%r{((<a[^<]+>)([^<\a>]*?)</a>)}i) do |match|
node = Nokogiri::HTML5.fragment(match[0]).children[0]
href = node.attributes["href"]&.value
if href && (external_href || matched_uploads(href).present?)
has_attachment = node.attributes["class"]&.value
index = $~.offset(0)[0]
text = match[2].strip.gsub("\n", "").gsub(/ +/, " ")
text = "#{text}|attachment" if has_attachment
yield(match[0], href, +"[#{text}](#{PLACEHOLDER})", index) if block_given?
end
end
end
def self.match_img(markdown, external_src: false, uploads: nil)
markdown.scan(%r{(<(?!img)[^<>]+/?>)?(\s*)(<img [^>\n]+>)}i) do |match|
node = Nokogiri::HTML5.fragment(match[2].strip).children[0]
src = node&.attributes&.[]("src")&.value
if src && (external_src || matched_uploads(src).present?)
upload = uploads&.[](src)
node["src"] = upload&.short_url || PLACEHOLDER
spaces_before = match[1].present? ? match[1][/ +$/].size : 0
replacement = +"#{" " * spaces_before}#{node.to_s}"
yield(match[2], src, replacement, $~.offset(0)[0]) if block_given?
end
end
end
def self.replace_hotlinked_image_urls(raw:, &blk)
replace =
Proc.new do |match, match_src, replacement, _index|
upload = blk.call(match_src)
next if !upload
replacement =
if replacement.include?(InlineUploads::PLACEHOLDER)
replacement.sub(InlineUploads::PLACEHOLDER, upload.short_url)
elsif replacement.include?(InlineUploads::PATH_PLACEHOLDER)
replacement.sub(InlineUploads::PATH_PLACEHOLDER, upload.short_path)
end
raw = raw.gsub(match, replacement)
end
# there are 6 ways to insert an image in a post
# HTML tag - <img src="http://...">
InlineUploads.match_img(raw, external_src: true, &replace)
# BBCode tag - [img]http://...[/img]
InlineUploads.match_bbcode_img(raw, external_src: true, &replace)
# Markdown linked image - [![alt](http://...)](http://...)
# Markdown inline - ![alt](http://...)
# Markdown inline - ![](http://... "image title")
# Markdown inline - ![alt](http://... "image title")
InlineUploads.match_md_inline_img(raw, external_src: true, &replace)
raw =
raw.gsub(%r{^(https?://\S+)(\s?)$}) do |match|
if upload = blk.call(match)
"![](#{upload.short_url})"
else
match
end
end
raw
end
def self.matched_uploads(node)
upload_path = Discourse.store.upload_path
base_url = Discourse.base_url.sub(%r{https?://}, "(https?://)")
regexps = [
%r{(upload://([a-zA-Z0-9]+)[a-zA-Z0-9\.]*)},
%r{(/uploads/short-url/([a-zA-Z0-9]+)[a-zA-Z0-9\.]*)},
%r{(#{base_url}/uploads/short-url/([a-zA-Z0-9]+)[a-zA-Z0-9\.]*)},
%r{(#{GlobalSetting.relative_url_root}/#{upload_path}#{UPLOAD_REGEXP_PATTERN})},
%r{(#{base_url}/#{upload_path}#{UPLOAD_REGEXP_PATTERN})},
]
if GlobalSetting.cdn_url && (cdn_url = GlobalSetting.cdn_url.sub(%r{https?://}, "(https?://)"))
regexps << %r{(#{cdn_url}/#{upload_path}#{UPLOAD_REGEXP_PATTERN})}
if GlobalSetting.relative_url_root.present?
regexps << %r{(#{cdn_url}#{GlobalSetting.relative_url_root}/#{upload_path}#{UPLOAD_REGEXP_PATTERN})}
end
end
if Discourse.store.external?
if Rails.configuration.multisite
regexps << %r{((https?:)?#{SiteSetting.Upload.s3_base_url}/#{upload_path}#{UPLOAD_REGEXP_PATTERN})}
regexps << %r{(#{SiteSetting.Upload.s3_cdn_url}/#{upload_path}#{UPLOAD_REGEXP_PATTERN})}
else
regexps << /((https?:)?#{SiteSetting.Upload.s3_base_url}#{UPLOAD_REGEXP_PATTERN})/
regexps << /(#{SiteSetting.Upload.s3_cdn_url}#{UPLOAD_REGEXP_PATTERN})/
end
end
matches = []
node = node.to_s
regexps.each do |regexp|
node.scan(/(^|[\n\s"'\(>])#{regexp}($|[\n\s"'\)<])/) { |matched| matches << matched[1] }
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 { |child| names = node_children_names(child, names) }
names
end
private_class_method :node_children_names
end