discourse/lib/onebox/preview.rb
Alan Guo Xiang Tan 322a3be2db
DEV: Remove logical OR assignment of constants ()
Constants should always be only assigned once. The logical OR assignment
of a constant is a relic of the past before we used zeitwerk for
autoloading and had bugs where a file could be loaded twice resulting in
constant redefinition warnings.
2024-10-16 10:09:07 +08:00

112 lines
2.4 KiB
Ruby

# frozen_string_literal: true
module Onebox
class Preview
# see https://bugs.ruby-lang.org/issues/14688
client_exception =
defined?(Net::HTTPClientException) ? Net::HTTPClientException : Net::HTTPServerException
WEB_EXCEPTIONS = [
client_exception,
OpenURI::HTTPError,
Timeout::Error,
Net::HTTPError,
Errno::ECONNREFUSED,
]
def initialize(url, options = Onebox.options)
@url = url
@options = options.dup
allowed_origins = @options[:allowed_iframe_origins] || Onebox::Engine.all_iframe_origins
@options[:allowed_iframe_regexes] = Engine.origins_to_regexes(allowed_origins)
@engine_class = Matcher.new(@url, @options).oneboxed
end
def to_s
return "" unless engine
sanitize process_html engine_html
rescue *WEB_EXCEPTIONS
""
end
def placeholder_html
return "" unless engine
sanitize process_html engine.placeholder_html
rescue *WEB_EXCEPTIONS
""
end
def errors
return {} unless engine
engine.errors
end
def data
return {} unless engine
engine.data
end
def verified_data
return {} unless engine
engine.verified_data
end
def options
OpenStruct.new(@options)
end
private
def engine_html
engine.to_html
end
def process_html(html)
return "" unless html
if @options[:max_width]
doc = Nokogiri::HTML5.fragment(html)
if doc
doc
.css("[width]")
.each do |e|
width = e["width"].to_i
if width > @options[:max_width]
height = e["height"].to_i
if (height > 0)
ratio = (height.to_f / width.to_f)
e["height"] = (@options[:max_width] * ratio).floor
end
e["width"] = @options[:max_width]
end
end
return doc.to_html
end
end
html
end
def sanitize(html)
config = @options[:sanitize_config] || SanitizeConfig::ONEBOX
config = config.merge(allowed_iframe_regexes: @options[:allowed_iframe_regexes])
Sanitize.fragment(html, config)
end
def engine
return nil unless @engine_class
return @engine if defined?(@engine)
@engine = @engine_class.new(@url)
@engine.options = @options
@engine
end
class InvalidURI < StandardError
end
end
end