lib/wicked_pdf/middleware.rb
class WickedPdf
class Middleware
def initialize(app, options = {}, conditions = {})
@app = app
@options = (WickedPdf.config || {}).merge(options)
@conditions = conditions
end
def call(env)
@request = Rack::Request.new(env)
@render_pdf = false
set_request_to_render_as_pdf(env) if render_as_pdf?
status, headers, response = @app.call(env)
if rendering_pdf? && headers['Content-Type'] =~ /text\/html|application\/xhtml\+xml/
body = response.respond_to?(:body) ? response.body : response.join
body = body.join if body.is_a?(Array)
body = WickedPdf.new(@options[:wkhtmltopdf]).pdf_from_string(translate_paths(body, env), @options)
response = [body]
# Do not cache PDFs
headers.delete('ETag')
headers.delete('Cache-Control')
headers['Content-Length'] = (body.respond_to?(:bytesize) ? body.bytesize : body.size).to_s
headers['Content-Type'] = 'application/pdf'
if @options.fetch(:disposition, '') == 'attachment'
headers['Content-Disposition'] = 'attachment'
headers['Content-Transfer-Encoding'] = 'binary'
end
end
[status, headers, response]
end
private
# Change relative paths to absolute
def translate_paths(body, env)
# Host with protocol
root = WickedPdf.config[:root_url] || "#{env['rack.url_scheme']}://#{env['HTTP_HOST']}/"
body.gsub(/(href|src)=(['"])\/([^\"']*|[^"']*)['"]/, '\1=\2' + root + '\3\2')
end
def rendering_pdf?
@render_pdf
end
def render_as_pdf?
request_path_is_pdf = @request.path.match(%r{\.pdf$})
if request_path_is_pdf && @conditions[:only]
rules = [@conditions[:only]].flatten
rules.any? do |pattern|
if pattern.is_a?(Regexp)
@request.fullpath =~ pattern
else
@request.path[0, pattern.length] == pattern
end
end
elsif request_path_is_pdf && @conditions[:except]
rules = [@conditions[:except]].flatten
rules.map do |pattern|
if pattern.is_a?(Regexp)
return false if @request.fullpath =~ pattern
elsif @request.path[0, pattern.length] == pattern
return false
end
end
return true
else
request_path_is_pdf
end
end
def set_request_to_render_as_pdf(env)
@render_pdf = true
%w[PATH_INFO REQUEST_URI].each { |e| env[e] = env[e].sub(%r{\.pdf\b}, '') }
env['HTTP_ACCEPT'] = concat(env['HTTP_ACCEPT'], Rack::Mime.mime_type('.html'))
env['Rack-Middleware-WickedPdf'] = 'true'
end
def concat(accepts, type)
(accepts || '').split(',').unshift(type).compact.join(',')
end
end
end