#!/usr/bin/env python3
# Copyright (c) 2014-2019 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Test the RPC HTTP basics."""

import http.client
import urllib.parse

from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import assert_equal, str_to_b64str


class HTTPBasicsTest (BitcoinTestFramework):
    def set_test_params(self):
        self.num_nodes = 3

    def setup_network(self):
        self.extra_args = [["-rpccorsdomain=null"], [], []]
        self.setup_nodes()

    def run_test(self):

        #
        # lowlevel check for http persistent connection #
        #
        url = urllib.parse.urlparse(self.nodes[0].url)
        authpair = url.username + ':' + url.password
        headers = {"Authorization": "Basic " + str_to_b64str(authpair)}

        conn = http.client.HTTPConnection(url.hostname, url.port)
        conn.connect()
        conn.request('POST', '/', '{"method": "getbestblockhash"}', headers)
        out1 = conn.getresponse().read()
        assert b'"error":null' in out1
        assert conn.sock is not None
        # according to http/1.1 connection must still be open!

        # send 2nd request without closing connection
        conn.request('POST', '/', '{"method": "getchaintips"}', headers)
        out1 = conn.getresponse().read()
        assert b'"error":null' in out1
        # must also response with a correct json-rpc message
        assert conn.sock is not None
        # according to http/1.1 connection must still be open!
        conn.close()

        # same should be if we add keep-alive because this should be the std.
        # behaviour
        headers = {"Authorization": "Basic " +
                   str_to_b64str(authpair), "Connection": "keep-alive"}

        conn = http.client.HTTPConnection(url.hostname, url.port)
        conn.connect()
        conn.request('POST', '/', '{"method": "getbestblockhash"}', headers)
        out1 = conn.getresponse().read()
        assert b'"error":null' in out1
        assert conn.sock is not None
        # according to http/1.1 connection must still be open!

        # send 2nd request without closing connection
        conn.request('POST', '/', '{"method": "getchaintips"}', headers)
        out1 = conn.getresponse().read()
        assert b'"error":null' in out1
        # must also response with a correct json-rpc message
        assert conn.sock is not None
        # according to http/1.1 connection must still be open!
        conn.close()

        # now do the same with "Connection: close"
        headers = {"Authorization": "Basic " +
                   str_to_b64str(authpair), "Connection": "close"}

        conn = http.client.HTTPConnection(url.hostname, url.port)
        conn.connect()
        conn.request('POST', '/', '{"method": "getbestblockhash"}', headers)
        out1 = conn.getresponse().read()
        assert b'"error":null' in out1
        assert conn.sock is None
        # now the connection must be closed after the response

        # node1 (2nd node) is running with disabled keep-alive option
        urlNode1 = urllib.parse.urlparse(self.nodes[1].url)
        authpair = urlNode1.username + ':' + urlNode1.password
        headers = {"Authorization": "Basic " + str_to_b64str(authpair)}

        conn = http.client.HTTPConnection(urlNode1.hostname, urlNode1.port)
        conn.connect()
        conn.request('POST', '/', '{"method": "getbestblockhash"}', headers)
        out1 = conn.getresponse().read()
        assert b'"error":null' in out1

        # node2 (third node) is running with standard keep-alive parameters
        # which means keep-alive is on
        urlNode2 = urllib.parse.urlparse(self.nodes[2].url)
        authpair = urlNode2.username + ':' + urlNode2.password
        headers = {"Authorization": "Basic " + str_to_b64str(authpair)}

        conn = http.client.HTTPConnection(urlNode2.hostname, urlNode2.port)
        conn.connect()
        conn.request('POST', '/', '{"method": "getbestblockhash"}', headers)
        out1 = conn.getresponse().read()
        assert b'"error":null' in out1
        assert conn.sock is not None
        # connection must be closed because bitcoind should use
        # keep-alive by default

        # Check excessive request size
        conn = http.client.HTTPConnection(urlNode2.hostname, urlNode2.port)
        conn.connect()
        conn.request('GET', '/' + ('x' * 1000), '', headers)
        out1 = conn.getresponse()
        assert_equal(out1.status, http.client.NOT_FOUND)

        conn = http.client.HTTPConnection(urlNode2.hostname, urlNode2.port)
        conn.connect()
        conn.request('GET', '/' + ('x' * 10000), '', headers)
        out1 = conn.getresponse()
        assert_equal(out1.status, http.client.BAD_REQUEST)

        # Check Standard CORS request
        origin = "null"

        conn = http.client.HTTPConnection(url.hostname, url.port)
        conn.connect()
        authpair = url.username + ':' + url.password
        headers = {"Authorization": "Basic " + str_to_b64str(authpair),
                   "Origin": origin}
        conn.request('POST', '/', '{"method": "getbestblockhash"}', headers)
        out1 = conn.getresponse()
        assert_equal(out1.status, http.client.OK)
        assert_equal(out1.headers["Access-Control-Allow-Origin"], origin)
        assert_equal(out1.headers["Access-Control-Allow-Credentials"], "true")
        assert_equal(out1.headers["Access-Control-Expose-Headers"],
                     "WWW-Authenticate")
        assert b'"error":null' in out1.read()

        # Check Pre-flight CORS request
        corsheaders = {"Origin": origin,
                       "Access-Control-Request-Method": "POST"}
        conn.request('OPTIONS', '/', None, corsheaders)
        out1 = conn.getresponse()
        assert_equal(out1.status, http.client.OK)
        assert_equal(out1.headers["Access-Control-Allow-Origin"], origin)
        assert_equal(out1.headers["Access-Control-Allow-Credentials"], "true")
        assert_equal(out1.headers["Access-Control-Allow-Methods"], "POST")
        assert_equal(out1.headers["Access-Control-Allow-Headers"],
                     "authorization,content-type")
        assert_equal(b'', out1.read())

        # Check Standard CORS request to node without CORS, expected failure
        conn = http.client.HTTPConnection(urlNode2.hostname, urlNode2.port)
        conn.connect()
        authpair = url.username + ':' + url.password
        headers = {"Authorization": "Basic " + str_to_b64str(authpair),
                   "Origin": origin}
        conn.request('POST', '/', '{"method": "getbestblockhash"}', headers)
        out1 = conn.getresponse()
        assert_equal(out1.status, http.client.UNAUTHORIZED)
        assert_equal(b'', out1.read())

        # Check Pre-flight CORS request to node without CORS, expected failure
        corsheaders = {"Origin": origin,
                       "Access-Control-Request-Method": "POST"}
        conn.request('OPTIONS', '/', None, corsheaders)
        out1 = conn.getresponse()
        assert_equal(out1.status, http.client.METHOD_NOT_ALLOWED)
        assert_equal(b'JSONRPC server handles only POST requests', out1.read())


if __name__ == '__main__':
    HTTPBasicsTest().main()
