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# HTTP server
# Copyright (C) 2023 Nguyễn Gia Phong
#
# This file if part of hybring.
#
# Hybring is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Hybring 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with hybring. If not, see <https://www.gnu.org/licenses/>.
require "http/server"
require "ini"
require "uri"
require "./sqlite"
require "./xhtml"
HTML_HEADINGS = Set{"applicants", "criteria", "joining", "members"}
MAX_CONTENT_LENGTH = 4096
MAX_NICK_LENGTH = 32
OPENNIC_TLD = Set{".bbs", ".chan", ".cyb", ".dyn", ".epic",
".geek", ".gopher", ".indy", ".libre", ".neo",
".null", ".o", ".oss", ".oz", ".parody", ".pirate"}
def http_error(context, status, message = nil)
context.response.respond_with_status status, message
end
class Server
def initialize(cfg)
@db = Database.new cfg.db, cfg.opennic_remote, cfg.icann_remote
@opennic_host = URI.parse(cfg.opennic_remote).host
@opennic_page = Page.new cfg.opennic_local, cfg.opennic_remote, cfg.api, @db
@opennic_page.write
@icann_page = Page.new cfg.icann_local, cfg.icann_remote, cfg.api, @db
@icann_page.write
@server = HTTP::Server.new do |context|
# Manually crafted request
next http_error context, 405 if context.request.method != "POST"
content_length = context.request.content_length
next http_error context, 411 unless content_length
next http_error context, 413 if content_length > MAX_CONTENT_LENGTH
errors = {} of String => String
params = {} of String => String
invalid_param = false
body = context.request.body.try &.gets_to_end || ""
URI::Params.parse body do |key, value|
params[key] = value
case key
when "nick"
if value.size > MAX_NICK_LENGTH
next errors["nick"] = "Must be within ${MAX_NICK_LENGTH} characters"
end
if /^[0-9a-z]+$/ !~ value
next errors["nick"] = "Must be ASCII lowercase alphanumeric"
end
when "opennic"
uri = URI.parse value
next errors["opennic"] = "Must be absolute URL" unless uri.absolute?
if uri.scheme != "http" && uri.scheme != "https"
next errors["opennic"] = "Must be HTTP/S"
end
host = uri.host
unless OPENNIC_TLD.includes? Path[host].extension
next errors["opennic"] = "Must be under OpenNIC domain"
end if host
when "icann"
uri = URI.parse value
next errors["icann"] = "Must be absolute URL" unless uri.absolute?
next errors["icann"] = "Must be HTTPS" unless uri.scheme == "https"
host = uri.host # impractical to check for ICANN TLD
if OPENNIC_TLD.includes? Path[host].extension
next errors["icann"] = "Must not be under OpenNIC domain"
end if host
when "host"
else
break invalid_param = true
end
end
# Manually crafted request
next http_error context, 400, "Invalid Parameter" if invalid_param
next http_error context, 400, "Missing Parameter" unless params.size == 4
@db.exec "SELECT count(nick), count(opennic), count(icann)
FROM member
WHERE nick = %Q OR opennic = %Q OR icann = %Q",
params["nick"], params["opennic"], params["icann"] do |row|
errors["nick"] = "Must be unique" if row[0].int > 0
errors["opennic"] = "Must be unique" if row[1].int > 0
errors["icann"] = "Must be unique" if row[2].int > 0
end
if HTML_HEADINGS.includes? params["nick"]
errors["nick"] = "Reserved names: #{HTML_HEADINGS.join ", "}"
end
if errors.empty?
@db.add_applicant params["nick"], params["opennic"], params["icann"]
# TODO: write feed
else
context.response.status_code = 400 unless errors.empty?
end
context.response.content_type = "application/xhtml+xml"
if params["host"] == @opennic_host
context.response.print @opennic_page.build errors, params
else
context.response.print @icann_page.build errors, params
end
# TODO: schedule dynamic check
end
end
getter db
getter opennic_page
getter icann_page
def listen(port)
@db.update_hook ->(arg : Void*, action : Database::UpdateAction,
db : LibC::Char*, table : LibC::Char*, rowid : Int64) {
return unless db == "main"
obj = arg.as Server
case table
when "member"
obj.opennic_page.write
obj.icann_page.write
end
}, self.as Void*
puts "Listening on http://#{@server.bind_tcp port}"
@server.listen
end
end
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