--[[
LuCI - Lua Configuration Interface

Copyright 2008 Steven Barth <steven@midlink.org>
Copyright 2008-2009 Jo-Philipp Wich <xm@subsignal.org>

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

$Id$
]]--

module("luci.controller.admin.system", package.seeall)

function index()
	luci.i18n.loadc("base")
	local i18n = luci.i18n.translate

	entry({"admin", "system"}, alias("admin", "system", "system"), i18n("System"), 30).index = true
	entry({"admin", "system", "system"}, cbi("admin_system/system"), i18n("System"), 1)
	entry({"admin", "system", "packages"}, call("action_packages"), i18n("Software"), 10)
	entry({"admin", "system", "packages", "ipkg"}, form("admin_system/ipkg"))
	entry({"admin", "system", "passwd"}, form("admin_system/passwd"), i18n("Admin Password"), 20)
	entry({"admin", "system", "sshkeys"}, form("admin_system/sshkeys"), i18n("<abbr title=\"Secure Shell\">SSH</abbr>-Keys"), 30)
	entry({"admin", "system", "processes"}, form("admin_system/processes"), i18n("Processes"), 45)

	if nixio.fs.access("/etc/config/fstab") then
		entry({"admin", "system", "fstab"}, cbi("admin_system/fstab"), i18n("Mount Points"), 50)
		entry({"admin", "system", "fstab", "mount"}, cbi("admin_system/fstab/mount"), nil).leaf = true
		entry({"admin", "system", "fstab", "swap"},  cbi("admin_system/fstab/swap"),  nil).leaf = true
	end

	if nixio.fs.access("/sys/class/leds") then
		entry({"admin", "system", "leds"}, cbi("admin_system/leds"), i18n("<abbr title=\"Light Emitting Diode\">LED</abbr> Configuration"), 60)
	end

	entry({"admin", "system", "backup"}, call("action_backup"), i18n("Backup / Restore"), 70)
	entry({"admin", "system", "upgrade"}, call("action_upgrade"), i18n("Flash Firmware"), 80)
	entry({"admin", "system", "reboot"}, call("action_reboot"), i18n("Reboot"), 90)
end

function action_packages()
	local ipkg = require("luci.model.ipkg")
	local submit = luci.http.formvalue("submit")
	local changes = false
	local install = { }
	local remove  = { }

	-- Search query
	local query = luci.http.formvalue("query")
	query = (query ~= '') and query or nil


	-- Packets to be installed
	local ninst = submit and luci.http.formvalue("install")
	local uinst = nil

	-- Install from URL
	local url = luci.http.formvalue("url")
	if url and url ~= '' and submit then
		uinst = url
	end

	-- Do install
	if ninst then
		_, install[ninst] = ipkg.install(ninst)
		changes = true
	end

	if uinst then
		_, install[uinst] = ipkg.install(uinst)
		changes = true
	end

	-- Remove packets
	local rem = submit and luci.http.formvalue("remove")
	if rem then
		_, remove[rem] = ipkg.remove(rem)
		changes = true
	end


	-- Update all packets
	local update = luci.http.formvalue("update")
	if update then
		_, update = ipkg.update()
	end


	-- Upgrade all packets
	local upgrade = luci.http.formvalue("upgrade")
	if upgrade then
		_, upgrade = ipkg.upgrade()
	end


	luci.template.render("admin_system/packages", {
		query=query, install=install, remove=remove, update=update, upgrade=upgrade
	})

	-- Remove index cache
	if changes then
		nixio.fs.unlink("/tmp/luci-indexcache")
	end
end

function action_backup()
	local sys = require "luci.sys"
	local fs  = require "luci.fs"

	local reset_avail = os.execute([[grep '"rootfs_data"' /proc/mtd >/dev/null 2>&1]]) == 0
	local restore_cmd = "tar -xzC/ >/dev/null 2>&1"
	local backup_cmd  = "tar -czT %s 2>/dev/null"

	local restore_fpi
	luci.http.setfilehandler(
		function(meta, chunk, eof)
			if not restore_fpi then
				restore_fpi = io.popen(restore_cmd, "w")
			end
			if chunk then
				restore_fpi:write(chunk)
			end
			if eof then
				restore_fpi:close()
			end
		end
	)

	local upload = luci.http.formvalue("archive")
	local backup = luci.http.formvalue("backup")
	local reset  = reset_avail and luci.http.formvalue("reset")

	if upload and #upload > 0 then
		luci.template.render("admin_system/applyreboot")
		luci.sys.reboot()
	elseif backup then
		local filelist = "/tmp/luci-backup-list.%d" % os.time()

		sys.call(
			"( find $(sed -ne '/^[[:space:]]*$/d; /^#/d; p' /etc/sysupgrade.conf " ..
			"/lib/upgrade/keep.d/* 2>/dev/null) -type f 2>/dev/null; " ..
			"opkg list-changed-conffiles ) | sort -u > %s" % filelist
		)

		if fs.access(filelist) then
			local reader = ltn12_popen(backup_cmd:format(filelist))
			luci.http.header('Content-Disposition', 'attachment; filename="backup-%s-%s.tar.gz"' % {
				luci.sys.hostname(), os.date("%Y-%m-%d")})
			luci.http.prepare_content("application/x-targz")
			luci.ltn12.pump.all(reader, luci.http.write)
			fs.unlink(filelist)
		end
	elseif reset then
		luci.template.render("admin_system/applyreboot")
		luci.util.exec("mtd -r erase rootfs_data")
	else
		luci.template.render("admin_system/backup", {reset_avail = reset_avail})
	end
end

function action_passwd()
	local p1 = luci.http.formvalue("pwd1")
	local p2 = luci.http.formvalue("pwd2")
	local stat = nil

	if p1 or p2 then
		if p1 == p2 then
			stat = luci.sys.user.setpasswd("root", p1)
		else
			stat = 10
		end
	end

	luci.template.render("admin_system/passwd", {stat=stat})
end

function action_reboot()
	local reboot = luci.http.formvalue("reboot")
	luci.template.render("admin_system/reboot", {reboot=reboot})
	if reboot then
		luci.sys.reboot()
	end
end

function action_upgrade()
	require("luci.model.uci")

	local tmpfile = "/tmp/firmware.img"

	local function image_supported()
		-- XXX: yay...
		return ( 0 == os.execute(
			". /etc/functions.sh; " ..
			"include /lib/upgrade; " ..
			"platform_check_image %q >/dev/null"
				% tmpfile
		) )
	end

	local function image_checksum()
		return (luci.sys.exec("md5sum %q" % tmpfile):match("^([^%s]+)"))
	end

	local function storage_size()
		local size = 0
		if nixio.fs.access("/proc/mtd") then
			for l in io.lines("/proc/mtd") do
				local d, s, e, n = l:match('^([^%s]+)%s+([^%s]+)%s+([^%s]+)%s+"([^%s]+)"')
				if n == "linux" then
					size = tonumber(s, 16)
					break
				end
			end
		elseif nixio.fs.access("/proc/partitions") then
			for l in io.lines("/proc/partitions") do
				local x, y, b, n = l:match('^%s*(%d+)%s+(%d+)%s+([^%s]+)%s+([^%s]+)')
				if b and n and not n:match('[0-9]') then
					size = tonumber(b) * 1024
					break
				end
			end
		end
		return size
	end


	-- Install upload handler
	local file
	luci.http.setfilehandler(
		function(meta, chunk, eof)
			if not nixio.fs.access(tmpfile) and not file and chunk and #chunk > 0 then
				file = io.open(tmpfile, "w")
			end
			if file and chunk then
				file:write(chunk)
			end
			if file and eof then
				file:close()
			end
		end
	)


	-- Determine state
	local keep_avail   = true
	local step         = tonumber(luci.http.formvalue("step") or 1)
	local has_image    = nixio.fs.access(tmpfile)
	local has_support  = image_supported()
	local has_platform = nixio.fs.access("/lib/upgrade/platform.sh")
	local has_upload   = luci.http.formvalue("image")

	-- This does the actual flashing which is invoked inside an iframe
	-- so don't produce meaningful errors here because the the
	-- previous pages should arrange the stuff as required.
	if step == 4 then
		if has_platform and has_image and has_support then
			-- Mimetype text/plain
			luci.http.prepare_content("text/plain")
			luci.http.write("Starting sysupgrade...\n")

			io.flush()

			-- Now invoke sysupgrade
			local keepcfg = keep_avail and luci.http.formvalue("keepcfg") == "1"
			local flash = ltn12_popen("/sbin/sysupgrade %s %q" %{
				keepcfg and "" or "-n", tmpfile
			})

			luci.ltn12.pump.all(flash, luci.http.write)
		end


	--
	-- This is step 1-3, which does the user interaction and
	-- image upload.
	--

	-- Step 1: file upload, error on unsupported image format
	elseif not has_image or not has_support or step == 1 then
		-- If there is an image but user has requested step 1
		-- or type is not supported, then remove it.
		if has_image then
			nixio.fs.unlink(tmpfile)
		end

		luci.template.render("admin_system/upgrade", {
			step=1,
			bad_image=(has_image and not has_support or false),
			keepavail=keep_avail,
			supported=has_platform
		} )

	-- Step 2: present uploaded file, show checksum, confirmation
	elseif step == 2 then
		luci.template.render("admin_system/upgrade", {
			step=2,
			checksum=image_checksum(),
			filesize=nixio.fs.stat(tmpfile).size,
			flashsize=storage_size(),
			keepconfig=(keep_avail and luci.http.formvalue("keepcfg") == "1")
		} )

	-- Step 3: load iframe which calls the actual flash procedure
	elseif step == 3 then
		luci.template.render("admin_system/upgrade", {
			step=3,
			keepconfig=(keep_avail and luci.http.formvalue("keepcfg") == "1")
		} )
	end
end

function ltn12_popen(command)

	local fdi, fdo = nixio.pipe()
	local pid = nixio.fork()

	if pid > 0 then
		fdo:close()
		local close
		return function()
			local buffer = fdi:read(2048)
			local wpid, stat = nixio.waitpid(pid, "nohang")
			if not close and wpid and stat == "exited" then
				close = true
			end

			if buffer and #buffer > 0 then
				return buffer
			elseif close then
				fdi:close()
				return nil
			end
		end
	elseif pid == 0 then
		nixio.dup(fdo, nixio.stdout)
		fdi:close()
		fdo:close()
		nixio.exec("/bin/sh", "-c", command)
	end
end
