#!/usr/bin/env python3
# Copyright(C) 2013-2020 Open Information Security Foundation

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 2 of the License.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

# Note to Docker users:
# If you are running SELinux in enforced mode, you may want to run
#   chcon -Rt svirt_sandbox_file_t SURICATA_ROOTSRC_DIR
# or the buildbot will not be able to access to the data in /data/oisf
# and the git step will fail.

import urllib.request, urllib.parse, urllib.error, urllib.request, urllib.error, urllib.parse, http.cookiejar
try:
    import simplejson as json
except:
    import json
import time
import argparse
import sys
import os
import copy
from subprocess import Popen, PIPE

GOT_NOTIFY = True
try:
    import pynotify
except:
    GOT_NOTIFY = False

GOT_DOCKER = True
GOT_DOCKERPY_API = 2

try:
    import docker
    try:
        from docker import APIClient as Client
        from docker import from_env as DockerClient
    except ImportError:
        GOT_DOCKERPY_API = 1
        try:
            from docker import Client
        except ImportError:
            GOT_DOCKER = False
except ImportError:
    GOT_DOCKER = False

# variables
#  - github user
#  - buildbot user and password

BASE_URI="https://buildbot.openinfosecfoundation.org/"
GITHUB_BASE_URI = "https://api.github.com/repos/"
GITHUB_MASTER_URI = "https://api.github.com/repos/OISF/suricata/commits?sha=master"

if GOT_DOCKER:
    parser = argparse.ArgumentParser(prog='prscript', description='Script checking validity of branch before PR')
else:
    parser = argparse.ArgumentParser(prog='prscript', description='Script checking validity of branch before PR',
                                     epilog='You need to install Python docker module to enable docker container handling options.')
parser.add_argument('-u', '--username', dest='username', help='github and buildbot user')
parser.add_argument('-p', '--password', dest='password', help='buildbot password')
parser.add_argument('-c', '--check', action='store_const', const=True, help='only check last build', default=False)
parser.add_argument('-v', '--verbose', action='store_const', const=True, help='verbose output', default=False)
parser.add_argument('--norebase', action='store_const', const=True, help='do not test if branch is in sync with master', default=False)
parser.add_argument('-r', '--repository', dest='repository', default='suricata', help='name of suricata repository on github')
parser.add_argument('-l', '--local', action='store_const', const=True, help='local testing before github push', default=False)
if GOT_NOTIFY:
    parser.add_argument('-n', '--notify', action='store_const', const=True, help='send desktop notification', default=False)

docker_deps = ""
if not GOT_DOCKER:
    docker_deps = " (disabled)"
parser.add_argument('-d', '--docker', action='store_const', const=True, help='use docker based testing', default=False)
parser.add_argument('-C', '--create', action='store_const', const=True, help='create docker container' + docker_deps, default=False)
parser.add_argument('-s', '--start', action='store_const', const=True, help='start docker container' + docker_deps, default=False)
parser.add_argument('-S', '--stop', action='store_const', const=True, help='stop docker container' + docker_deps, default=False)
parser.add_argument('-R', '--rm', action='store_const', const=True, help='remove docker container and image' + docker_deps, default=False)
parser.add_argument('branch', metavar='branch', help='github branch to build', nargs='?')
args = parser.parse_args()
username = args.username
password = args.password
cookie = None

if args.create or args.start or args.stop or args.rm:
    if GOT_DOCKER:
        args.docker = True
        args.local = True
    else:
        print("You need to install python docker to use docker handling features.")
        sys.exit(-1)

if not args.local:
    if not args.username:
        print("You need to specify a github username (-u option) for this mode (or use -l to disable)")
        sys.exit(-1)

if args.docker:
    BASE_URI="http://localhost:8010/"
    BUILDERS_LIST = ["gcc", "clang", "debug", "features", "profiling", "pcaps"]
else:
    BUILDERS_LIST = [username, username + "-pcap"]

BUILDERS_URI=BASE_URI+"builders/"
JSON_BUILDERS_URI=BASE_URI+"json/builders/"

if GOT_NOTIFY:
    if args.notify:
        pynotify.init("PRscript")

def SendNotification(title, text):
    if not GOT_NOTIFY:
        return
    if not args.notify:
        return
    n = pynotify.Notification(title, text)
    n.show()

def TestRepoSync(branch):
    request = urllib.request.Request(GITHUB_MASTER_URI)
    page = urllib.request.urlopen(request)
    json_result = json.loads(page.read())
    sha_orig = json_result[0]["sha"]
    check_command = ["git", "branch", "--contains", sha_orig ]
    p1 = Popen(check_command, stdout=PIPE)
    p2 = Popen(["grep", branch], stdin=p1.stdout, stdout=PIPE)
    p1.stdout.close()
    output = p2.communicate()[0]
    if len(output) == 0:
        return -1
    return 0

def TestGithubSync(branch):
    request = urllib.request.Request(GITHUB_BASE_URI + username + "/" + args.repository + "/commits?sha=" + branch + "&per_page=1")
    try:
        page = urllib.request.urlopen(request)
    except urllib.error.HTTPError as e:
        if e.code == 404:
            return -2
        else:
            raise(e)
    json_result = json.loads(page.read())
    sha_github = json_result[0]["sha"]
    check_command = ["git", "rev-parse", branch]
    p1 = Popen(check_command, stdout=PIPE)
    sha_local = p1.communicate()[0].decode('ascii').rstrip()
    if sha_local != sha_github:
        return -1
    return 0

def OpenBuildbotSession():
    auth_params = { 'username':username,'passwd':password, 'name':'login'}
    cookie = http.cookiejar.LWPCookieJar()
    params = urllib.parse.urlencode(auth_params).encode('ascii')
    opener = urllib.request.build_opener(urllib.request.HTTPCookieProcessor(cookie))
    urllib.request.install_opener(opener)
    request = urllib.request.Request(BASE_URI + 'login', params)
    _ = urllib.request.urlopen(request)
    return cookie


def SubmitBuild(branch, extension = "", builder_name = None):
    raw_params = {'branch':branch,'reason':'Testing ' + branch, 'name':'force_build', 'forcescheduler':'force'}
    params = urllib.parse.urlencode(raw_params).encode('ascii')
    if not args.docker:
        opener = urllib.request.build_opener(urllib.request.HTTPCookieProcessor(cookie))
        urllib.request.install_opener(opener)
    if builder_name == None:
        builder_name = username + extension
    request = urllib.request.Request(BUILDERS_URI + builder_name + '/force', params)
    page = urllib.request.urlopen(request)

    result = page.read()
    if args.verbose:
        print("=== response ===")
        print(result)
        print("=== end of response ===")
    if args.docker:
        if "<h2>Pending Build Requests:</h2>" in result:
            print("Build '" + builder_name + "' submitted")
            return 0
        else:
            return -1
    if b'Current Builds' in result:
        print("Build '" + builder_name + "' submitted")
        return 0
    else:
        return -1

# TODO honor the branch argument
def FindBuild(branch, extension = "", builder_name = None):
    if builder_name == None:
        request = urllib.request.Request(JSON_BUILDERS_URI + username + extension + '/')
    else:
        request = urllib.request.Request(JSON_BUILDERS_URI + builder_name + '/')
    page = urllib.request.urlopen(request)
    json_result = json.loads(page.read())
    # Pending build is unnumbered
    if json_result["pendingBuilds"]:
        return -1
    if json_result["currentBuilds"]:
        return json_result["currentBuilds"][0]
    if json_result["cachedBuilds"]:
        return json_result["cachedBuilds"][-1]
    return -2

def GetBuildStatus(builder, buildid, extension="", builder_name = None):
    if builder_name == None:
        builder_name = username + extension
    # https://buildbot.oisf.net/json/builders/build%20deb6/builds/11
    request = urllib.request.Request(JSON_BUILDERS_URI + builder_name + '/builds/' + str(buildid))
    page = urllib.request.urlopen(request)
    result = page.read()
    if args.verbose:
        print("=== response ===")
        print(result)
        print("=== end of response ===")
    json_result = json.loads(result)
    if json_result["currentStep"]:
        return 1
    if 'successful' in json_result["text"]:
        return 0
    return -1

def WaitForBuildResult(builder, buildid, extension="", builder_name = None):
    # fetch result every 10 secs till task is over
    if builder_name == None:
        builder_name = username + extension
    res = 1
    while res == 1:
        res = GetBuildStatus(username,buildid, builder_name = builder_name)
        if res == 1:
            time.sleep(10)

    # return the result
    if res == 0:
        print("Build successful for " + builder_name)
    else:
        print("Build failure for " + builder_name + ": " + BUILDERS_URI + builder_name + '/builds/' + str(buildid))
    return res

    # check that github branch and OISF master branch are sync
if not args.local:
    ret = TestGithubSync(args.branch)
    if ret != 0:
        if ret == -2:
            print("Branch " + args.branch + " is not pushed to Github.")
            sys.exit(-1)
        if args.norebase:
            print("Branch " + args.branch + " is not in sync with corresponding Github branch. Continuing due to --norebase option.")
        else:
            print("Branch " + args.branch + " is not in sync with corresponding Github branch. Push may be needed.")
            sys.exit(-1)
    if TestRepoSync(args.branch) != 0:
        if args.norebase:
            print("Branch " + args.branch + " is not in sync with OISF's master branch. Continuing due to --norebase option.")
        else:
            print("Branch " + args.branch + " is not in sync with OISF's master branch. Rebase needed.")
            sys.exit(-1)

def CreateContainer():
    # FIXME check if existing
    print("Pulling docking image, first run should take long")
    if GOT_DOCKERPY_API < 2:
        cli = Client()
        cli.pull('regit/suri-buildbot')
        cli.create_container(name='suri-buildbot', image='regit/suri-buildbot', ports=[8010, 22], volumes=['/data/oisf', '/data/buildbot/master/master.cfg'])
    else:
        cli = DockerClient()
        cli.images.pull('regit/suri-buildbot')
        suri_src_dir = os.path.split(os.path.dirname(os.path.realpath(__file__)))[0]
        print("Using base src dir: " + suri_src_dir)
        cli.containers.create('regit/suri-buildbot', name='suri-buildbot', ports={'8010/tcp': 8010, '22/tcp': None} , volumes={suri_src_dir: { 'bind': '/data/oisf', 'mode': 'ro'}, os.path.join(suri_src_dir,'qa','docker','buildbot.cfg'): { 'bind': '/data/buildbot/master/master.cfg', 'mode': 'ro'}}, detach = True)
    sys.exit(0)

def StartContainer():
    suri_src_dir = os.path.split(os.path.dirname(os.path.realpath(__file__)))[0]
    print("Using base src dir: " + suri_src_dir)
    if GOT_DOCKERPY_API < 2:
        cli = Client()
        cli.start('suri-buildbot', port_bindings={8010:8010, 22:None}, binds={suri_src_dir: { 'bind': '/data/oisf', 'ro': True}, os.path.join(suri_src_dir,'qa','docker','buildbot.cfg'): { 'bind': '/data/buildbot/master/master.cfg', 'ro': True}} )
    else:
        cli = DockerClient()
        cli.containers.get('suri-buildbot').start()
    sys.exit(0)

def StopContainer():
    if GOT_DOCKERPY_API < 2:
        cli = Client()
        cli.stop('suri-buildbot')
    else:
        cli = DockerClient()
        cli.containers.get('suri-buildbot').stop()
    sys.exit(0)

def RmContainer():
    if GOT_DOCKERPY_API < 2:
        cli = Client()
        try:
            cli.remove_container('suri-buildbot')
        except:
            print("Unable to remove suri-buildbot container")
        try:
            cli.remove_image('regit/suri-buildbot:latest')
        except:
            print("Unable to remove suri-buildbot images")
    else:
        cli = DockerClient()
        cli.containers.get('suri-buildbot').remove()
        cli.images.remove('regit/suri-buildbot:latest')
    sys.exit(0)

if GOT_DOCKER:
    if args.create:
        CreateContainer()
    if args.start:
        StartContainer()
    if args.stop:
        StopContainer()
    if args.rm:
        RmContainer()

if not args.branch:
    print("You need to specify a branch for this mode")
    sys.exit(-1)

# submit buildbot form to build current branch on the devel builder
if not args.check:
    if not args.docker:
        cookie = OpenBuildbotSession()
        if cookie == None:
            print("Unable to connect to buildbot with provided credentials")
            sys.exit(-1)
    for build in BUILDERS_LIST:
        res = SubmitBuild(args.branch, builder_name = build)
        if res == -1:
            print("Unable to start build. Check command line parameters")
            sys.exit(-1)

buildids = {}

if args.docker:
    time.sleep(2)

# get build number and exit if we don't have
for build in BUILDERS_LIST:
    buildid = FindBuild(args.branch, builder_name = build)
    if buildid == -1:
        print("Pending build tracking is not supported. Follow build by browsing " + BUILDERS_URI + build)
    elif buildid == -2:
        print("No build found for " + BUILDERS_URI + build)
        sys.exit(0)
    else:
        if not args.docker:
            print("You can watch build progress at " + BUILDERS_URI + build + "/builds/" + str(buildid))
        buildids[build] = buildid

if args.docker:
    print("You can watch build progress at " + BASE_URI + "waterfall")

if len(buildids):
    print("Waiting for build completion")
else:
    sys.exit(0)

buildres = 0
if args.docker:
    while len(buildids):
        up_buildids = copy.copy(buildids)
        for build in buildids:
            ret = GetBuildStatus(build, buildids[build], builder_name = build)
            if ret == -1:
                buildres = -1
                up_buildids.pop(build, None)
                if len(up_buildids):
                    remains = " (remaining builds: " + ', '.join(list(up_buildids.keys())) + ")"
                else:
                    remains = ""
                print("Build failure for " + build + ": " + BUILDERS_URI + build + '/builds/' + str(buildids[build]) + remains)
            elif ret == 0:
                up_buildids.pop(build, None)
                if len(up_buildids):
                    remains = " (remaining builds: " + ', '.join(list(up_buildids.keys())) + ")"
                else:
                    remains = ""
                print("Build successful for " + build + remains)
        time.sleep(5)
        buildids = up_buildids
    if res == -1:
        SendNotification("PRscript failure", "Some builds have failed. Check <a href='" + BASE_URI + "waterfall'>waterfall</a> for results.")
        sys.exit(-1)
    else:
        print("PRscript completed successfully")
        SendNotification("PRscript success", "Congrats! All builds have passed.")
        sys.exit(0)
else:
    for build in buildids:
        res = WaitForBuildResult(build, buildids[build], builder_name = build)
        if res == -1:
            buildres = -1

if buildres == 0:
    if not args.norebase and not args.docker:
        print("You can copy/paste following lines into github PR")
        for build in buildids:
            print("- PR " + build + ": " + BUILDERS_URI + build + "/builds/" + str(buildids[build]))
    SendNotification("OISF PRscript success", "Congrats! All builds have passed.")
    sys.exit(0)
else:
    SendNotification("OISF PRscript failure", "Some builds have failed. Check <a href='" + BASE_URI + "waterfall'>waterfall</a> for results.")
    sys.exit(-1)
