#!/usr/bin/python3
#
# This is a command-line script for calling management APIs
# on the Mail-in-a-Box control panel backend. The script
# reads /var/lib/mailinabox/api.key for the backend's
# root API key. This file is readable only by root, so this
# tool can only be used as root.

import sys, getpass, urllib.request, urllib.error, json, csv
import contextlib

def mgmt(cmd, data=None, is_json=False):
	# The base URL for the management daemon. (Listens on IPv4 only.)
	mgmt_uri = 'http://127.0.0.1:10222'

	setup_key_auth(mgmt_uri)

	req = urllib.request.Request(mgmt_uri + cmd, urllib.parse.urlencode(data).encode("utf8") if data else None)
	try:
		response = urllib.request.urlopen(req)
	except urllib.error.HTTPError as e:
		if e.code == 401:
			with contextlib.suppress(Exception):
				print(e.read().decode("utf8"))
			print("The management daemon refused access. The API key file may be out of sync. Try 'service mailinabox restart'.", file=sys.stderr)
		elif hasattr(e, 'read'):
			print(e.read().decode('utf8'), file=sys.stderr)
		else:
			print(e, file=sys.stderr)
		sys.exit(1)
	resp = response.read().decode('utf8')
	if is_json: resp = json.loads(resp)
	return resp

def read_password():
    while True:
        first = getpass.getpass('password: ')
        if len(first) < 8:
            print("Passwords must be at least eight characters.")
            continue
        second = getpass.getpass(' (again): ')
        if first != second:
            print("Passwords not the same. Try again.")
            continue
        break
    return first

def setup_key_auth(mgmt_uri):
	with open('/var/lib/mailinabox/api.key', encoding='utf-8') as f:
		key = f.read().strip()

	auth_handler = urllib.request.HTTPBasicAuthHandler()
	auth_handler.add_password(
		realm='Mail-in-a-Box Management Server',
		uri=mgmt_uri,
		user=key,
		passwd='')
	opener = urllib.request.build_opener(auth_handler)
	urllib.request.install_opener(opener)

if len(sys.argv) < 2:
	print("""Usage:
  {cli} user                                     (lists users)
  {cli} user add user@domain.com [password]
  {cli} user password user@domain.com [password]
  {cli} user remove user@domain.com
  {cli} user make-admin user@domain.com
  {cli} user remove-admin user@domain.com
  {cli} user admins                              (lists admins)
  {cli} user mfa show user@domain.com            (shows MFA devices for user, if any)
  {cli} user mfa disable user@domain.com [id]    (disables MFA for user)
  {cli} alias                                    (lists aliases)
  {cli} alias add incoming.name@domain.com sent.to@other.domain.com
  {cli} alias add incoming.name@domain.com 'sent.to@other.domain.com, multiple.people@other.domain.com'
  {cli} alias remove incoming.name@domain.com

Removing a mail user does not delete their mail folders on disk. It only prevents IMAP/SMTP login.
""".format(
	cli="management/cli.py"
		))

elif sys.argv[1] == "user" and len(sys.argv) == 2:
	# Dump a list of users, one per line. Mark admins with an asterisk.
	users = mgmt("/mail/users?format=json", is_json=True)
	for domain in users:
		for user in domain["users"]:
			if user['status'] == 'inactive': continue
			print(user['email'], end='')
			if "admin" in user['privileges']:
				print("*", end='')
			print()

elif sys.argv[1] == "user" and sys.argv[2] in {"add", "password"}:
	if len(sys.argv) < 5:
		email = input('email: ') if len(sys.argv) < 4 else sys.argv[3]
		pw = read_password()
	else:
		email, pw = sys.argv[3:5]

	if sys.argv[2] == "add":
		print(mgmt("/mail/users/add", { "email": email, "password": pw }))
	elif sys.argv[2] == "password":
		print(mgmt("/mail/users/password", { "email": email, "password": pw }))

elif sys.argv[1] == "user" and sys.argv[2] == "remove" and len(sys.argv) == 4:
	print(mgmt("/mail/users/remove", { "email": sys.argv[3] }))

elif sys.argv[1] == "user" and sys.argv[2] in {"make-admin", "remove-admin"} and len(sys.argv) == 4:
	action = 'add' if sys.argv[2] == 'make-admin' else 'remove'
	print(mgmt("/mail/users/privileges/" + action, { "email": sys.argv[3], "privilege": "admin" }))

elif sys.argv[1] == "user" and sys.argv[2] == "admins":
	# Dump a list of admin users.
	users = mgmt("/mail/users?format=json", is_json=True)
	for domain in users:
		for user in domain["users"]:
			if "admin" in user['privileges']:
				print(user['email'])

elif sys.argv[1] == "user" and len(sys.argv) == 5 and sys.argv[2:4] == ["mfa", "show"]:
	# Show MFA status for a user.
	status = mgmt("/mfa/status", { "user": sys.argv[4] }, is_json=True)
	W = csv.writer(sys.stdout)
	W.writerow(["id", "type", "label"])
	for mfa in status["enabled_mfa"]:
		W.writerow([mfa["id"], mfa["type"], mfa["label"]])

elif sys.argv[1] == "user" and len(sys.argv) in {5, 6} and sys.argv[2:4] == ["mfa", "disable"]:
	# Disable MFA (all or a particular device) for a user.
	print(mgmt("/mfa/disable", { "user": sys.argv[4], "mfa-id": sys.argv[5] if len(sys.argv) == 6 else None }))

elif sys.argv[1] == "alias" and len(sys.argv) == 2:
	print(mgmt("/mail/aliases"))

elif sys.argv[1] == "alias" and sys.argv[2] == "add" and len(sys.argv) == 5:
	print(mgmt("/mail/aliases/add", { "address": sys.argv[3], "forwards_to": sys.argv[4] }))

elif sys.argv[1] == "alias" and sys.argv[2] == "remove" and len(sys.argv) == 4:
	print(mgmt("/mail/aliases/remove", { "address": sys.argv[3] }))

else:
	print("Invalid command-line arguments.")
	sys.exit(1)