#!/usr/bin/env python

# Check access


import inspect, os, sys
# From http://stackoverflow.com/questions/279237/python-import-a-module-from-a-folder
cmd_subfolder = os.path.realpath(os.path.abspath(os.path.join(os.path.split(inspect.getfile( inspect.currentframe() ))[0],"..")))
if cmd_subfolder not in sys.path:
    sys.path.insert(0, cmd_subfolder)

import mosq_test
import signal

def write_config(filename, port, per_listener):
    with open(filename, 'w') as f:
        f.write("per_listener_settings %s\n" % (per_listener))
        f.write("port %d\n" % (port))
        f.write("acl_file %s\n" % (filename.replace('.conf', '.acl')))

def write_acl(filename, global_en, user_en, pattern_en):
    with open(filename, 'w') as f:
        if global_en:
            f.write('topic readwrite topic/global\n')
        if user_en:
            f.write('user username\n')
            f.write('topic readwrite topic/username\n')
        if pattern_en:
            f.write('pattern readwrite pattern/%u\n')



def single_test(port, per_listener, username, topic, expect_deny):
    rc = 1

    conf_file = os.path.basename(__file__).replace('.py', '.conf')
    write_config(conf_file, port, per_listener)

    broker = mosq_test.start_broker(filename=os.path.basename(__file__), use_conf=True, port=port)

    try:
        keepalive = 60
        connect_packet = mosq_test.gen_connect("acl-check", keepalive=keepalive, username=username)
        connack_packet = mosq_test.gen_connack(rc=0)

        mid = 1
        subscribe_packet = mosq_test.gen_subscribe(mid=mid, topic=topic, qos=1)
        suback_packet = mosq_test.gen_suback(mid=mid, qos=1)

        mid = 2
        publish1s_packet = mosq_test.gen_publish(topic=topic, mid=mid, qos=1, payload="message")
        puback1s_packet = mosq_test.gen_puback(mid)

        mid=1
        publish1r_packet = mosq_test.gen_publish(topic=topic, mid=mid, qos=1, payload="message")
        pingreq_packet = mosq_test.gen_pingreq()
        pingresp_packet = mosq_test.gen_pingresp()

        sock = mosq_test.do_client_connect(connect_packet, connack_packet, port=port)
        mosq_test.do_send_receive(sock, subscribe_packet, suback_packet, "suback")
        mosq_test.do_send_receive(sock, publish1s_packet, puback1s_packet, "puback")
        if expect_deny:
            mosq_test.do_send_receive(sock, pingreq_packet, pingresp_packet, "pingresp")
        else:
            mosq_test.expect_packet(sock, "publish1r", publish1r_packet)
        sock.close()

        rc = 0
    finally:
        os.remove(conf_file)
        broker.terminate()
        broker.wait()
        (stdo, stde) = broker.communicate()
        if rc:
            print(stde)
            exit(rc)

def acl_test(port, per_listener, global_en, user_en, pattern_en):
    acl_file = os.path.basename(__file__).replace('.py', '.acl')

    write_acl(acl_file, global_en=global_en, user_en=user_en, pattern_en=pattern_en)

    if global_en:
        single_test(port, per_listener, username=None,       topic="topic/global", expect_deny=False)
        single_test(port, per_listener, username="username", topic="topic/global", expect_deny=True)
    if user_en:
        single_test(port, per_listener, username=None,       topic="topic/username", expect_deny=True)
        single_test(port, per_listener, username="username", topic="topic/username", expect_deny=False)
    if pattern_en:
        single_test(port, per_listener, username=None,       topic="pattern/username", expect_deny=True)
        single_test(port, per_listener, username="username", topic="pattern/username", expect_deny=False)

def do_test(port, per_listener):
    try:
        acl_test(port, per_listener, global_en=False, user_en=False, pattern_en=True)
        acl_test(port, per_listener, global_en=False, user_en=True, pattern_en=False)
        acl_test(port, per_listener, global_en=True, user_en=False, pattern_en=False)
        acl_test(port, per_listener, global_en=False, user_en=True, pattern_en=True)
        acl_test(port, per_listener, global_en=True, user_en=False, pattern_en=True)
        acl_test(port, per_listener, global_en=True, user_en=True, pattern_en=True)
    finally:
        acl_file = os.path.basename(__file__).replace('.py', '.acl')
        os.remove(acl_file)

port = mosq_test.get_port()

do_test(port, "true")
do_test(port, "false")