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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
NICK_PATTERN = "[0-9a-z]{1,#{MAX_NICK_LENGTH}}"
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
content_type = context.request.headers["Content-Type"]?
unless content_type && content_type == "application/x-www-form-urlencoded"
next http_error context, 415
end
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 /^#{NICK_PATTERN}$/ !~ value
# Manually crafted request or non-mainstream browser engine
next errors["nick"] = "Must match #{NICK_PATTERN}"
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
unless OPENNIC_TLD.includes? Path[uri.host.not_nil!].extension
next errors["opennic"] = "Must be under OpenNIC domain"
end
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"
# impractical to check for ICANN TLD
if OPENNIC_TLD.includes? Path[uri.host.not_nil!].extension
next errors["icann"] = "Must not be under OpenNIC domain"
end
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(CASE WHEN nick = %Q THEN 1 END),
count(CASE WHEN opennic = %Q THEN 1 END),
count(CASE WHEN icann = %Q THEN 1 END)
FROM member",
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
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 opennic_page
getter icann_page
def listen(port = 0)
@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"
# FIXME: query in a different conn
obj.opennic_page.write
obj.icann_page.write
end
}, self.as Void*
yield @server.bind_tcp port
@server.listen
end
def listening?
@server.listening?
end
def close
@server.close
end
end
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