#!/usr/bin/python

# Copyright (c) 2009 Symbian Foundation.

# All rights reserved.

# This component and the accompanying materials are made available

# under the terms of the License "Eclipse Public License v1.0"

# which accompanies this distribution, and is available

# at the URL "http://www.eclipse.org/legal/epl-v10.html".

#

# Initial Contributors:

# Symbian Foundation - Initial contribution

# 

# Description:

# Script to download and unpack a Symbian PDK - assumes "7z" installed to unzip the files

import urllib2

import urllib

import os.path

import cookielib

import sys

import getpass

import re

import time

from BeautifulSoup import BeautifulSoup

from optparse import OptionParser

import hashlib

import xml.etree.ElementTree as ET 

user_agent = 'downloadkit.py script'

headers = { 'User-Agent' : user_agent }

top_level_url = "http://developer.symbian.org"

download_list = []

unzip_list = []

urlopen = urllib2.urlopen

Request = urllib2.Request

def login(prompt):

	global options

	loginurl = 'https://developer.symbian.org/main/user_profile/login.php'

	if prompt:

		if options.username == '':

			print >> sys.stderr, 'username: ',

			options.username=sys.stdin.readline().strip()

		if options.password == '':

			options.password=getpass.getpass()

	values = {'username' : options.username,

	          'password' : options.password,

	          'submit': 'Login'}

	headers = { 'User-Agent' : user_agent }

	data = urllib.urlencode(values)

	req = urllib2.Request(loginurl, data, headers)

	response = urllib2.urlopen(req)

	doc=response.read()      

	if doc.find('Please try again') != -1:

		print >> sys.stderr, 'Login failed'

		return False

	return True

from threading import Thread

class unzipfile(Thread):

	def __init__ (self,filename,levels=1,deletelevels=0):

		Thread.__init__(self)

		self.filename = filename

		self.levels = levels

		self.deletelevels = deletelevels

		self.status = -1

	def unzip(self,filename,unziplevel,deletelevel):

		if unziplevel < 1:

			return 0   # do nothing

		print "  Unzipping " + filename

		filelist = os.popen("7z x -y "+self.filename)

		subzips = []

		for line in filelist.readlines():

			# Extracting  src_oss_app_webuis.zip

			match = re.match(r"^Extracting\s+(\S+.zip)$", line)

			if match is None: continue

			subzips.append(match.group(1))

		topstatus = filelist.close()

		if deletelevel > 0:

			print "  Deleting " + filename

			os.remove(filename)

		if unziplevel > 1 and len(subzips) > 0:

			print "  Expanding %d zip files from %s" % (len(subzips), filename)

			for subzip in subzips:

				self.unzip(subzip, unziplevel-1, deletelevel-1)

		return topstatus

	def run(self):

		self.status = self.unzip(self.filename, self.levels, self.deletelevels)

threadlist = []

def schedule_unzip(filename, unziplevel, deletelevel):

	global options

	if options.nounzip :

		return

	if options.nodelete :

		deletelevel = 0

	if options.dryrun :

		global unzip_list

		if unziplevel > 0:

			unzip_list.append("7z x -y %s" % filename)

			if unziplevel > 1:

				unzip_list.append("# unzip recursively %d more times" % unziplevel-1)

		if deletelevel > 0:

			unzip_list.append("# delete %s" % filename)

			if deletelevel > 1:

				unzip_list.append("# delete zip files recursively %d more times" % deletelevel-1)

		return

	unzipthread = unzipfile(filename, unziplevel, deletelevel)

	global threadlist

	threadlist.append(unzipthread)

	unzipthread.start()

def complete_outstanding_unzips():

	global options

	if options.dryrun or options.nounzip:

		return

	print "Waiting for outstanding commands to finish..."

	for thread in threadlist:

		thread.join()  

def check_unzip_environment():

	global options

	if options.nounzip:

		return True		# if we aren't unzipping, no need to have 7z installed

	help = os.popen("7z -h")

	for line in help.readlines():

		if re.match('7-Zip', line) :

			help.close()

			return True

	help.close()

	return False

def orderResults(x,y) :

	def ranking(name) :

		# 0th = release_metadata

		if re.match(r"release_metadata", name):

			return 0000;

		# 1st = release_metadata, build_BOM.zip (both small things!)

		if re.match(r"build_BOM", name):

			return 1000;

		# 2nd = tools, binaries (required for execution and compilation)

		elif re.match(r"(binaries_|tools_)", name):

			return 2000;

		# 3rd = rnd binaries, binary patches

		elif re.match(r"(bin_)", name):

			return 3000;

		# 4th = sources

		elif re.match(r"(src_sfl|src_oss)", name):

			return 4000;

		# 5rd = rnd sources, source patches (not sure we'd ever have those)

		elif re.match(r"(src_)", name):

			return 5000;

		# Last, anything else

		return 10000;

	xtitle = x['title']

	ytitle = y['title']

	return cmp(ranking(xtitle)+cmp(xtitle,ytitle), ranking(ytitle))

def md5_checksum(filename):

	MD5_BLOCK_SIZE = 128 * 1024

	md5 = hashlib.md5()

	try:

		file = open(filename,"rb")

	except IOError:

		print "Terminating script: Unable to open %S" % filename

		sys.exit()

	while True:

		data = file.read(MD5_BLOCK_SIZE)

		if not data:

			break

		md5.update(data)

	file.close()

	return md5.hexdigest().upper()

checksums = {}

def parse_release_metadata(filename):

	if os.path.exists(filename):

		tree = ET.parse(filename)

		iter = tree.getiterator('package')

		for element in iter:

			if element.keys():

				file = element.get("name")

				md5 = element.get("md5checksum")

				checksums[file] = md5.upper()

def download_file(filename,url):

	global options

	global checksums

	if os.path.exists(filename):

		if filename in checksums:

			print 'Checking existing ' + filename

			file_checksum = md5_checksum(filename)

			if file_checksum == checksums[filename]:

				if options.progress:

					print '- OK ' + filename

				return True

	if options.dryrun and not re.match(r"release_metadata", filename):

		global download_list

		download_info = "download %s %s" % (filename, url)

		download_list.append(download_info)

		return True

	print 'Downloading ' + filename

	global headers

	req = urllib2.Request(url, None, headers)

	CHUNK = 128 * 1024

	size = 0

	filesize = -1

	start_time = time.time()

	last_time = start_time

	last_size = size

	try:

		response = urllib2.urlopen(req)

		chunk = response.read(CHUNK)

		if chunk.find('<div id="sign_in_box">') != -1:

			# our urllib2 cookies have gone awol - login again

			login(False)

			req = urllib2.Request(url, None, headers)

			response = urllib2.urlopen(req)

			chunk = response.read(CHUNK)

			if chunk.find('<div id="sign_in_box">') != -1:

				# still broken - give up on this one

				print "*** ERROR trying to download %s" % (filename)

				return False

		info = response.info()

		if 'Content-Length' in info:

			filesize = int(info['Content-Length'])

		else:

			print "*** HTTP response did not contain 'Content-Length' when expected"

			print info

			return False

	except urllib2.URLError, e:

		print '- ERROR: Failed to start downloading ' + filename

		if hasattr(e, 'reason'):

			print 'Reason: ', e.reason

		elif hasattr(e, 'code'):

			print 'Error code: ', e.code

		return False

	# we are now up and running, and chunk contains the start of the download

	try:

		fp = open(filename, 'wb')

		md5 = hashlib.md5()

		while True:

			fp.write(chunk)

			md5.update(chunk)

			size += len(chunk)

			now = time.time()

			if options.progress and now-last_time > 20:

				rate = (size-last_size)/(now-last_time)

				estimate = ""

				if filesize > 0 and rate > 0:

					remaining_seconds = (filesize-size)/rate

					if remaining_seconds > 110:

						remaining = "%d minutes" % (remaining_seconds/60)

					else:

						remaining = "%d seconds" % remaining_seconds

					estimate = "- %d%% est. %s" % ((100*size/filesize), remaining)

				print "- %d Kb (%d Kb/s) %s" % (size/1024, (rate/1024)+0.5, estimate)

				last_time = now

				last_size = size

			chunk = response.read(CHUNK)

			if not chunk: break

		fp.close()

		if options.progress:

			now = time.time()

			print "- Completed %s - %d Kb in %d seconds" % (filename, (filesize/1024)+0.5, now-start_time)

	#handle errors

	except urllib2.URLError, e:

		print '- ERROR: Failed while downloading ' + filename

		if hasattr(e, 'reason'):

			print 'Reason: ', e.reason

		elif hasattr(e, 'code'):

			print 'Error code: ', e.code

		return False

	if filename in checksums:

		download_checksum = md5.hexdigest().upper()

		if download_checksum != checksums[filename]:

			print '- WARNING: %s checksum does not match' % filename

	return True

def downloadkit(version):	

	global headers

	global options

	urlbase = 'http://developer.symbian.org/main/tools_and_kits/downloads/'

	viewid = 5   # default to Symbian^3

	if version[0] == 2:

		viewid= 1  # Symbian^2

	if version[0] == 3:

		viewid= 5  # Symbian^3

	url = urlbase + ('view.php?id=%d'% viewid) + 'vId=' + version

	req = urllib2.Request(url, None, headers)

	response = urllib2.urlopen(req)

	doc=response.read()

	# BeatifulSoup chokes on some javascript, so we cut away everything before the <body>

	try:

		bodystart=doc.find('<body>')

		doc = doc[bodystart:]

	except:

		pass

	threadlist = []

	# let's hope the HTML format never changes...

	# <a href='download.php?id=27&cid=60&iid=270' title='src_oss_mw.zip'> ...</a> 

	soup=BeautifulSoup(doc)

	results=soup.findAll('a', href=re.compile("^download"), title=re.compile("\.(zip|xml)$"))

	results.sort(orderResults)

	for result in results:

		downloadurl = urlbase + result['href']

		filename = result['title']

		if options.nosrc and re.match(r"(src_sfl|src_oss)", filename) :

			continue 	# no snapshots of Mercurial source thanks...

		if download_file(filename, downloadurl) != True :

			continue # download failed

		# unzip the file (if desired)

		if re.match(r"patch", filename):

			complete_outstanding_unzips()	# ensure that the thing we are patching is completed first

		if re.match(r"release_metadata", filename):

			parse_release_metadata(filename)	# read the md5 checksums etc

		elif re.match(r"(bin|tools).*\.zip", filename):

			schedule_unzip(filename, 1, 0)   # unzip once, don't delete

		elif re.match(r"src_.*\.zip", filename):

			schedule_unzip(filename, 1, 1)   # zip of zips, delete top level

		elif re.match(r"build_BOM.zip", filename):

			schedule_unzip(filename, 1, 1)   # unpack then delete zip as it's not needed again

	# wait for the unzipping threads to complete

	complete_outstanding_unzips()  

	return 1

parser.add_option("-n", "--dryrun", action="store_true", dest="dryrun",

	help="print the files to be downloaded, the 7z commands, and the recommended deletions")

parser.add_option("--nosrc", action="store_true", dest="nosrc",

	help="Don't download any of the source code available directly from Mercurial")

parser.add_option("--nounzip", action="store_true", dest="nounzip",

	help="Just download, don't unzip or delete any files")

parser.add_option("--nodelete", action="store_true", dest="nodelete",

	help="Do not delete files after unzipping")

parser.add_option("--progress", action="store_true", dest="progress",

	help="Report download progress")

parser.add_option("-u", "--username", dest="username", metavar="USER",

	help="login to website as USER")

parser.add_option("-p", "--password", dest="password", metavar="PWD",

	help="specify the account password")

parser.set_defaults(

	dryrun=False, 

	nosrc=False, 

	nounzip=False, 

	nodelete=False, 

	progress=False,

	username='',

	)

(options, args) = parser.parse_args()

if len(args) != 1:

	parser.error("Must supply a PDK version, e.g. 3.0.f")

if not check_unzip_environment() :

	parser.error("Unable to execute 7z command")

login(True)

downloadkit(args[0])

if options.dryrun:

	print "# instructions for downloading kit " + args[0]

	for download in download_list:

		print download

	for command in unzip_list:

		print command