#!/usr/bin/env python

# -*- coding: utf-8 -*-

"""

 (c) 2014-2018 - Copyright Red Hat Inc

 Authors:

   Patrick Uiterwijk <puiterwijk@redhat.com></puiterwijk@redhat.com>

"""

from __future__ import unicode_literals, print_function, absolute_import

import sys

import os

import requests

# Since this is run by sshd, we don't have a way to set environment

# variables ahead of time

if "PAGURE_CONFIG" not in os.environ and os.path.exists(

    "/etc/pagure/pagure.cfg"

):

    os.environ["PAGURE_CONFIG"] = "/etc/pagure/pagure.cfg"

# Here starts the code

from pagure.config import config as pagure_config

# Get the arguments

# Expect sshd config:

# AuthorizedKeysCommand: <scriptpath> "%u" "%h" "%t" "%f"</scriptpath>

# <us> <username> <homedir> <keytype> <fingerprint></fingerprint></keytype></homedir></username></us>

# At this moment, we ignore the homedir and fingerprint, since looking

# up a key by fingerprint would require some model changes (ssh keys would

#   need to be stored in a fashion like DeployKeys).

# But to not break installations in the future, we should ask installations

# to set up sshd in a way that it will work if we use them in the future.

if len(sys.argv) < 5:

    print("Invalid call, too few arguments", file=sys.stderr)

    sys.exit(1)

username, userhome, keytype, fingerprint = sys.argv[1:5]

username_lookup = pagure_config["SSH_KEYS_USERNAME_LOOKUP"]

expect_username = pagure_config["SSH_KEYS_USERNAME_EXPECT"]

if username in pagure_config["SSH_KEYS_USERNAME_FORBIDDEN"]:

    print("User is forbidden for keyhelper.", file=sys.stderr)

    sys.exit(1)

if not username_lookup:

    if not expect_username:

        print("Pagure keyhelper configured incorrectly", file=sys.stderr)

        sys.exit(1)

    if username != expect_username:

        # Nothing to look up, this user is not git-related

        sys.exit(0)

url = "%s/pv/ssh/lookupkey/" % pagure_config["APP_URL"]

data = {"search_key": fingerprint}

if username_lookup:

    data["username"] = username

headers = {}

if pagure_config.get("SSH_ADMIN_TOKEN"):

    headers["Authorization"] = "token %s" % pagure_config["SSH_ADMIN_TOKEN"]

resp = requests.post(url, data=data, headers=headers)

if not resp.status_code == 200:

    print(

        "Error during lookup request: status: %s" % resp.status_code,

        file=sys.stderr,

    )

    sys.exit(1)

result = resp.json()

if not result["found"]:

    # Everything OK, key just didn't exist.

    sys.exit(0)

print(

    "%s %s"

    % (pagure_config["SSH_KEYS_OPTIONS"] % result, result["public_key"])

)