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|
=begin
Feed2Imap - RSS/Atom Aggregator uploading to an IMAP Server
Copyright (c) 2005 Lucas Nussbaum <lucas@lucas-nussbaum.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
=end
require 'zlib'
require 'net/http'
# get openssl if available
begin
require 'net/https'
rescue LoadError
end
require 'uri'
# max number of redirections
MAXREDIR = 5
HTTPDEBUG = false
# Class used to retrieve the feed over HTTP
class HTTPFetcher
@timeout = 30 # should be enough for everybody...
def timeout=(value)
@timeout = value
end
def fetcher(baseuri, uri, lastcheck, recursion)
proxy_host = nil
proxy_port = nil
proxy_user = nil
proxy_pass = nil
if ENV['http_proxy']
proxy_uri = URI.parse(ENV['http_proxy'])
proxy_host = proxy_uri.host
proxy_port = proxy_uri.port
proxy_user, proxy_pass = proxy_uri.userinfo.split(/:/) if proxy_uri.userinfo
end
http = Net::HTTP::Proxy(proxy_host,
proxy_port,
proxy_user,
proxy_pass ).new(uri.host, uri.port)
http.read_timeout = @timeout
http.open_timeout = @timeout
if uri.scheme == 'https'
http.use_ssl = true
http.verify_mode = OpenSSL::SSL::VERIFY_NONE
end
if defined?(Feed2Imap)
useragent = "Feed2Imap v#{Feed2Imap.version} http://home.gna.org/feed2imap/"
else
useragent = 'Feed2Imap http://home.gna.org/feed2imap/'
end
headers = {
'User-Agent' => useragent,
'Accept-Encoding' => 'gzip',
}
if lastcheck != Time::at(0)
headers.merge!('If-Modified-Since' => lastcheck.httpdate)
end
req = Net::HTTP::Get::new(uri.request_uri, headers)
if uri.userinfo
login, pw = uri.userinfo.split(':')
req.basic_auth(login, pw)
# workaround. eg. wikini redirects and loses auth info.
elsif uri.host == baseuri.host and baseuri.userinfo
login, pw = baseuri.userinfo.split(':')
req.basic_auth(login, pw)
end
begin
response = http.request(req)
rescue Timeout::Error
raise "Timeout while fetching #{baseuri.to_s}"
end
case response
when Net::HTTPSuccess
case response['Content-Encoding']
when 'gzip'
return Zlib::GzipReader.new(StringIO.new(response.body)).read
else
return response.body
end
when Net::HTTPRedirection
# if not modified
if Net::HTTPNotModified === response
puts "HTTPNotModified on #{uri}" if HTTPDEBUG
return nil
end
if recursion > 0
redir = URI::join(uri.to_s, response['location'])
return fetcher(baseuri, redir, lastcheck, recursion - 1)
else
raise "Too many redirections while fetching #{baseuri.to_s}"
end
else
raise "#{response.code}: #{response.message} while fetching #{baseuri.to_s}"
end
end
def fetch(url, lastcheck)
uri = URI::parse(url)
return fetcher(uri, uri, lastcheck, MAXREDIR)
end
end
|
