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app.rb
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app.rb
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# encoding: UTF-8
require 'sinatra/base'
require 'nokogiri'
require 'mime/types'
require 'yaml'
require 'haml'
require 'log4r'
require 'data_mapper'
%w{config model lyrictools ebreviarpage decorator helpers proxies}.each do |r|
require_relative File.join('lib', 'eantifonar', r)
end
class EAntifonarApp < Sinatra::Base
include EAntifonar
include EAntifonar::Helpers
def initialize
super()
# absolute links to these domains will be modified
@wrapped_domains = {}
['lh.kbs.sk', 'breviar.cz'].each do |d|
full = 'http://'+d
@wrapped_domains[d] = {:full => full, :regex => Regexp.new('^'+full+'/*')}
end
EAntifonar.init_logging
decorator_logger = Log4r::Logger['decorator']
@decorator = Decorator.new decorator_logger, self.class.development?
@proxy = HTTPProxy.new site: 'https://lh.kbs.sk'
end
Encoding.default_external = 'UTF-8' if "1.9".respond_to?(:encoding)
set :haml, :default_encoding => 'utf-8'
set :haml, :layout => :_layout
set :haml, :format => :xhtml
## routes for static content
get /\.(png|ico|js)$/ do
return static_content request
end
get '/about.html' do
rev = nil
rev_file = File.join('public', 'REVISION')
if File.exist? rev_file then
File.open(rev_file) {|f| rev = f.gets }
end
haml :about, :locals => {:git_revision => rev}
end
## forwarded routes
get '/' do
redirect '/cgi-bin/l.cgi?qt=pdnes&j=cz&c=cz', 302
end
get '/robots.txt' do
erb :robots, content_type: 'text/plain'
end
get '*' do
forward_request request, :get, params
end
post '*' do
forward_request request, :post, params
end
## "system" routes
not_found do
haml :error404
end
## methods
# finds and returns static content;
# looks for local content and eventually returns it
# (as a valid Sinatra response - the Array variant);
# if it is not found, forwards the request to the external site
def static_content(request)
local_path = File.join('public', request.path)
unless File.exist?(local_path) # TODO: unsafe!
return forward_request(request, request.request_method, params)
end
content = File.read(local_path)
content_type = MIME::Types.type_for(local_path).first.to_s # "" if no matching type is found
return [200, { 'Content-Type' => content_type }, content]
end
# determine if a request to the given route should be forwarded
# to the external site or not
def forward?(route)
if route.start_with? '/cgi-bin/l.cgi' then
return true
end
whitelist = %w{
/breviar.css
/ebreviar-cz.css
}
if whitelist.include? route then
return true
end
# by default don't forward
return false
end
# forwards a request to the external site,
# returns a valid response as expected by Sinatra (the Array variant)
def forward_request(orig_request, method, params={})
unless forward? orig_request.path
raise Sinatra::NotFound
end
response = @proxy.handle_request method, orig_request, request.env['rack.request.query_hash']
code, headers, body = response
if code == 404 then
raise Sinatra::NotFound
end
# modify the response
if html? body then
orig_url = 'http://breviar.sk'+orig_request.path+'?'+::URI.encode_www_form(params)
body = modify_page_content(body, orig_url)
end
# drop most of the headers
headers = copy_keys(headers, ['Date', 'Content-Type'])
return [code, headers, body]
end
def modify_page_content(content, request_path)
doc = Nokogiri::HTML(content)
doc.encoding = 'utf-8'
# replace direct internal links so that the user doesn't leave eantifonar accidentally
doc.css('a').each do |a|
next unless a['href'].is_a? String
next if a.parent['class'] == 'patka'
if a['href'].start_with?('http://') then
puts "examining link #{a['href']}"
@wrapped_domains.each_pair do |d, d_data|
if a['href'].start_with?(d_data[:full]) then
new_href = a['href'].sub(d_data[:regex], '/')
puts "link #{a['href']} -> #{new_href}"
a['href'] = new_href
break
end
end
end
end
@decorator.decorate doc, request_path # insert scores etc.
return doc.to_html(:encoding => 'utf-8')
end
## 'main': start the server if ruby file executed directly
run! if app_file == $0
end