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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 'net/http'
# get openssl if available
begin
require 'openssl'
rescue
end
require 'uri'
# Class used to retrieve the feed over HTTP
# TODO non standard port, authentification
# TODO don't use If-Mod-Since if = 0
if defined?(F2I_VERSION)
USERAGENT = 'Feed2Imap v#{F2I_VERSION} http://home.gna.org/feed2imap/'
else
USERAGENT = 'Feed2Imap http://home.gna.org/feed2imap/'
end
class HTTPFetcher
def HTTPFetcher::fetcher(baseuri, uri, lastcheck, recursion)
if uri.scheme == 'http'
http = Net::HTTP::new(uri.host, uri.port)
else
http = Net::HTTPS::new(uri.host, uri.port)
end
req = Net::HTTP::Get::new(uri.request_uri, {'User-Agent' => USERAGENT, 'If-Modified-Since' => lastcheck.httpdate})
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 #{uri.to_s}"
end
case response
when Net::HTTPSuccess
return response.body
when Net::HTTPRedirection
# if not modified
return nil if Net::HTTPNotModified === response
if recursion > 0
redir = URI::join(uri.to_s, response['location'])
return fetcher(baseuri, redir, lastcheck, recursion - 1)
end
end
# or raise en exception
response.error!
end
def HTTPFetcher::fetch(url, lastcheck)
uri = URI::parse(url)
return HTTPFetcher::fetcher(uri, uri, lastcheck, 5)
http = Net::HTTP::new(uri.host)
response = http.get(uri.path, {'User-Agent' => USERAGENT, 'If-Modified-Since' => lastcheck.httpdate})
if response.class == Net::HTTPOK
return response.body
elsif response.class == Net::HTTPNotModified
return nil
elsif response.class == Net::HTTPNotFound
raise "Page not found (404)"
else
raise "Unknown response #{response.class}"
end
end
end
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