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#!/usr/bin/env ruby
# coding: utf-8

# http://docs.gitlab.com/ee/workflow/repository_mirroring.html
# https://gitlab.com/gitlab-org/gitlab-ee/issues/767

load 'gitmirrorbackend.rb'
require 'net/http'
require 'uri'
require 'cgi'
require 'json'

class GitLabCE < GitMirrorBackend
	class Error < RuntimeError
		def initialize(obj)
			@obj = obj
		end
		def obj
			return @obj
		end
	end
	def initialize()
		@connections = {}
		@cache = {}

		# API docs suck, look at `lib/api/projects.rb` instead.
		@vars = [
			:builds_enabled,                                  # create | create-user | edit
			:container_registry_enabled, # XXX                # create |             | edit
			:default_branch,                                  #        | create-user | edit
			:description,                                     # create | create-user | edit
			#:import_url, # XXX                               # create | create-user |
			:issues_enabled,                                  # create | create-user | edit
			:lfs_enabled,                                     # create | create-user | edit
			:merge_requests_enabled,                          # create | create-user | edit
			:name,                                            # create | create-user | edit
			#:namespace_id,                                   # create |             |
			:only_allow_merge_if_build_succeeds,              # create | create-user | edit
			#:path,                                           # create |             | edit
			:public,                                          # create | create-user | edit
			:public_builds,                                   # create | create-user | edit
			:request_access_enabled,                          # create | create-user | edit
			:shared_runners_enabled,                          # create | create-user | edit
			:snippets_enabled,                                # create | create-user | edit
			:visibility_level,                                # create | create-user | edit
			:wiki_enabled,                                    # create | create-user | edit
			:only_allow_merge_if_all_discussions_are_resolved # create | create-user | edit
		]
	end

	def finish
		@connections.each do |k,v|
			v.finish()
		end
		@connections = {}
		super
	end

	def _connection(uri)
		key=URI(uri.scheme+":")
		key.host = uri.host
		key.port = uri.port

		@connections[key] ||= Net::HTTP::start(uri.host, uri.port, :use_ssl => uri.scheme == 'https')
		return @connections[key]
	end

	def _info(project_id)
		@cache[project_id] ||= {}
		unless @cache[project_id].has_key?(:info)
			req = Net::HTTP::Get.new(@api_uri + "projects/" + CGI::escape(project_id))
			req.add_field("PRIVATE-TOKEN", @api_key)
			con = _connection(req.uri)
			res = con.request(req)
			case res.code
			when "200"
				@cache[project_id][:info] = JSON::parse(res.body)
			when "404"
				@cache[project_id][:info] = nil
			else
				raise Error.new(res)
			end
		end
		return @cache[project_id][:info]
	end

	def cmd_config(*args)
		args.each do |arg|
			key, val = arg.split('=', 2)
			case key
			when "apiurl"
				@api_uri = URI(val)
				unless @api_uri.path.end_with?("/")
					@api_uri.path += "/"
				end
			when "apikey"
				@api_key = val
			end
		end
	end

	def cmd_get_meta(project_id)
		return _info(project_id).select{|k,v| @vars.include?(k.to_sym)}
	end

	def cmd_set_meta(project_id, *pairs)
		map = {}
		pairs.each do |pair|
			key, val = arg.split('=', 2)
			map[key] = val
		end

		mirror = map["mirror"]
		map.delete("mirror")

		illegal = map.select{|k,v| not @vars.include?(k.to_sym)}
		if illegal.count > 0
			raise Error.new(illegal)
		end

		info = self._info(project_id)
		if info == nil
			# create
			req = Net::HTTP::Put.new(@api_uri + "projects"))
			req.add_field("PRIVATE-TOKEN", @api_key)
			req.add_field("Content-Type", "application/json")
			map["path"] = project_id
			if not mirror.nil?
				map["import_url"] = mirror
			end
			req.body = JSON::dump(map)
			con = _connection(req.uri)
			res = con.request(req)
			if res.code != "201"
				raise Error.new(res)
			end
			@cache[project_id][:info] = JSON::parse(res.body)
		else
			# update
			req = Net::HTTP::Put.new(@api_uri + "projects/" + CGI::escape(info["id"].to_s))
			req.add_field("PRIVATE-TOKEN", @api_key)
			req.add_field("Content-Type", "application/json")
			req.body = JSON::dump(map)
			con = _connection(req.uri)
			res = con.request(req)
			if res.code != "200"
				raise Error.new(res)
			end
			@cache[project_id][:info] = JSON::parse(res.body)
		end
		return get_meta
	end

	def cmd_push_url(project_id)
		return _info(project_id)["ssh_url_to_repo"]
	end

	def cmd_pull_url(project_id)
		return _info(project_id)["http_url_to_repo"]
	end

	def cmd_repo_mode
		return "passive"
	end
end

if __FILE__ == $0
    if ARGV.length != 1
		raise "Usage: $0 ACCOUNT_NAME"
	end
	GitLabCE.new().repl(ARGV[1])
end