/*

Copyright (c) 2012, Arvid Norberg
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in
      the documentation and/or other materials provided with the distribution.
    * Neither the name of the author nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.

*/

#include "test.hpp"
#include "libtorrent/http_parser.hpp"
#include "libtorrent/parse_url.hpp"

#include <tuple>

using namespace libtorrent;

// TODO: 3 use span here instead of zero-terminated string
std::tuple<int, int, bool> feed_bytes(http_parser& parser, char const* str)
{
	std::tuple<int, int, bool> ret(0, 0, false);
	std::tuple<int, int, bool> prev(0, 0, false);
	for (int chunks = 1; chunks < 70; ++chunks)
	{
		ret = std::make_tuple(0, 0, false);
		parser.reset();
		span<char const> recv_buf(str, 0);
		for (;;)
		{
			int chunk_size = (std::min)(chunks, int(strlen(recv_buf.end())));
			if (chunk_size == 0) break;
			recv_buf = span<char const>(recv_buf.data(), recv_buf.size() + chunk_size);
			int payload, protocol;
			bool error = false;
			std::tie(payload, protocol) = parser.incoming(recv_buf, error);
			std::get<0>(ret) += payload;
			std::get<1>(ret) += protocol;
			std::get<2>(ret) |= error;
//			std::cerr << payload << ", " << protocol << ", " << chunk_size << std::endl;
			TORRENT_ASSERT(payload + protocol == chunk_size || std::get<2>(ret));
		}
		TEST_CHECK(prev == std::make_tuple(0, 0, false) || ret == prev || std::get<2>(ret));
		if (!std::get<2>(ret))
		{
			TEST_EQUAL(std::get<0>(ret) + std::get<1>(ret), int(strlen(str)));
		}

		prev = ret;
	}
	return ret;
}

TORRENT_TEST(http_parser)
{
	// HTTP request parser
	http_parser parser;
	std::tuple<int, int, bool> received;

	received = feed_bytes(parser
		, "HTTP/1.1 200 OK\r\n"
		"Content-Length: 4\r\n"
		"Content-Type: text/plain\r\n"
		"\r\n"
		"test");

	TEST_CHECK(received == std::make_tuple(4, 64, false));
	TEST_CHECK(parser.finished());
	span<char const> body = parser.get_body();
	TEST_CHECK(std::equal(body.begin(), body.end(), "test"));
	TEST_CHECK(parser.header("content-type") == "text/plain");
	TEST_CHECK(atoi(parser.header("content-length").c_str()) == 4);

	parser.reset();

	TEST_CHECK(!parser.finished());

	char const* upnp_response =
		"HTTP/1.1 200 OK\r\n"
		"ST:upnp:rootdevice\r\n"
		"USN:uuid:000f-66d6-7296000099dc::upnp:rootdevice\r\n"
		"Location: http://192.168.1.1:5431/dyndev/uuid:000f-66d6-7296000099dc\r\n"
		"Server: Custom/1.0 UPnP/1.0 Proc/Ver\r\n"
		"EXT:\r\n"
		"Cache-Control:max-age=180\r\n"
		"DATE: Fri, 02 Jan 1970 08:10:38 GMT\r\n\r\n";

	received = feed_bytes(parser, upnp_response);

	TEST_CHECK(received == std::make_tuple(0, int(strlen(upnp_response)), false));
	TEST_CHECK(parser.get_body().empty());
	TEST_CHECK(parser.header("st") == "upnp:rootdevice");
	TEST_CHECK(parser.header("location")
		== "http://192.168.1.1:5431/dyndev/uuid:000f-66d6-7296000099dc");
	TEST_CHECK(parser.header("ext") == "");
	TEST_CHECK(parser.header("date") == "Fri, 02 Jan 1970 08:10:38 GMT");
	TEST_EQUAL(parser.connection_close(), false);

	// test connection close
	parser.reset();

	TEST_CHECK(!parser.finished());

	char const* http1_response =
		"HTTP/1.0 200 OK\r\n"
		"Cache-Control: max-age=180\r\n"
		"DATE: Fri, 02 Jan 1970 08:10:38 GMT\r\n\r\n";

	received = feed_bytes(parser, http1_response);

	TEST_CHECK(received == std::make_tuple(0, int(strlen(http1_response)), false));
	TEST_CHECK(parser.get_body().empty());
	TEST_CHECK(parser.header("date") == "Fri, 02 Jan 1970 08:10:38 GMT");
	TEST_EQUAL(parser.connection_close(), true);

	parser.reset();

	TEST_CHECK(!parser.finished());

	char const* close_response =
		"HTTP/1.1 200 OK\r\n"
		"Connection: close\r\n"
		"DATE: Fri, 02 Jan 1970 08:10:38 GMT\r\n\r\n";

	received = feed_bytes(parser, close_response);

	TEST_CHECK(received == std::make_tuple(0, int(strlen(close_response)), false));
	TEST_CHECK(parser.get_body().empty());
	TEST_CHECK(parser.header("date") == "Fri, 02 Jan 1970 08:10:38 GMT");
	TEST_EQUAL(parser.connection_close(), true);

	parser.reset();

	TEST_CHECK(!parser.finished());

	char const* keep_alive_response =
		"HTTP/1.1 200 OK\r\n"
		"Connection: keep-alive\r\n"
		"DATE: Fri, 02 Jan 1970 08:10:38 GMT\r\n\r\n";

	received = feed_bytes(parser, keep_alive_response);

	TEST_CHECK(received == std::make_tuple(0, int(strlen(keep_alive_response)), false));
	TEST_CHECK(parser.get_body().empty());
	TEST_CHECK(parser.header("date") == "Fri, 02 Jan 1970 08:10:38 GMT");
	TEST_EQUAL(parser.connection_close(), false);

	parser.reset();
	TEST_CHECK(!parser.finished());

	char const* upnp_notify =
		"NOTIFY * HTTP/1.1\r\n"
		"Host:239.255.255.250:1900\r\n"
		"NT:urn:schemas-upnp-org:device:MediaServer:1\r\n"
		"NTS:ssdp:alive\r\n"
		"Location:http://10.0.1.15:2353/upnphost/udhisapi.dll?content=uuid:c17f2c31-d19b-4912-af94-651945c8a84e\r\n"
		"USN:uuid:c17f0c32-d1db-4be8-ae94-25f94583026e::urn:schemas-upnp-org:device:MediaServer:1\r\n"
		"Cache-Control:max-age=900\r\n"
		"Server:Microsoft-Windows-NT/5.1 UPnP/1.0 UPnP-Device-Host/1.0\r\n";

	received = feed_bytes(parser, upnp_notify);

	TEST_CHECK(received == std::make_tuple(0, int(strlen(upnp_notify)), false));
	TEST_CHECK(parser.method() == "notify");
	TEST_CHECK(parser.path() == "*");

	parser.reset();
	TEST_CHECK(!parser.finished());

	char const* bt_lsd = "BT-SEARCH * HTTP/1.1\r\n"
		"Host: 239.192.152.143:6771\r\n"
		"Port: 6881\r\n"
		"Infohash: 12345678901234567890\r\n"
		"\r\n";

	received = feed_bytes(parser, bt_lsd);

	TEST_CHECK(received == std::make_tuple(0, int(strlen(bt_lsd)), false));
	TEST_CHECK(parser.method() == "bt-search");
	TEST_CHECK(parser.path() == "*");
	TEST_CHECK(atoi(parser.header("port").c_str()) == 6881);
	TEST_CHECK(parser.header("infohash") == "12345678901234567890");

	TEST_CHECK(parser.finished());

	parser.reset();
	TEST_CHECK(!parser.finished());

	// test chunked encoding
	char const* chunked_test = "HTTP/1.1 200 OK\r\n"
		"Content-Length: 20\r\n"
		"Content-Type: text/plain\r\n"
		"Transfer-Encoding: chunked\r\n"
		"\r\n"
		"4\r\n"
		"test\r\n"
		"10\r\n"
		"0123456789abcdef\r\n"
		"0\r\n"
		"Test-header: foobar\r\n"
		"\r\n";

	received = feed_bytes(parser, chunked_test);

	std::printf("payload: %d protocol: %d\n", std::get<0>(received), std::get<1>(received));
	TEST_CHECK(received == std::make_tuple(20, int(strlen(chunked_test)) - 20, false));
	TEST_CHECK(parser.finished());
	TEST_CHECK(std::equal(parser.get_body().begin(), parser.get_body().end()
		, "4\r\ntest\r\n10\r\n0123456789abcdef"));
	TEST_CHECK(parser.header("test-header") == "foobar");
	TEST_CHECK(parser.header("content-type") == "text/plain");
	TEST_CHECK(atoi(parser.header("content-length").c_str()) == 20);
	TEST_CHECK(parser.chunked_encoding());
	typedef std::pair<std::int64_t, std::int64_t> chunk_range;
	std::vector<chunk_range> cmp;
	cmp.push_back(chunk_range(96, 100));
	cmp.push_back(chunk_range(106, 122));
	TEST_CHECK(cmp == parser.chunks());

	// make sure we support trackers with incorrect line endings
	char const* tracker_response =
		"HTTP/1.1 200 OK\n"
		"content-length: 5\n"
		"content-type: test/plain\n"
		"\n"
		"\ntest";

	received = feed_bytes(parser, tracker_response);

	TEST_CHECK(received == std::make_tuple(5, int(strlen(tracker_response) - 5), false));
	TEST_CHECK(parser.get_body().size() == 5);

	parser.reset();

	// make sure we support content-range responses
	// and that we're case insensitive
	char const* web_seed_response =
		"HTTP/1.1 206 OK\n"
		"contEnt-rAngE: bYTes 0-4\n"
		"conTent-TyPe: test/plain\n"
		"\n"
		"\ntest";

	received = feed_bytes(parser, web_seed_response);

	TEST_CHECK(received == std::make_tuple(5, int(strlen(web_seed_response) - 5), false));
	TEST_CHECK(parser.content_range() == (std::pair<std::int64_t, std::int64_t>(0, 4)));
	TEST_CHECK(parser.content_length() == 5);

	parser.reset();

	// test invalid content range
	char const* invalid_range_response =
		"HTTP/1.1 206 OK\n"
		"content-range: bytes 4-0\n"
		"content-type: test/plain\n"
		"\n"
		"\ntest";

	received = feed_bytes(parser, invalid_range_response);

	TEST_CHECK(std::get<2>(received) == true);

	parser.reset();

	// test invalid status line
	char const* invalid_status_response =
		"HTTP/1.1 206\n"
		"content-range: bytes 4-0\n"
		"content-type: test/plain\n"
		"\n"
		"\ntest";

	received = feed_bytes(parser, invalid_status_response);

	TEST_CHECK(std::get<2>(received) == true);

	parser.reset();

	// test invalid status line 2
	char const* invalid_status_response2 =
		"HTTP/1.1\n"
		"content-range: bytes 4-0\n"
		"content-type: test/plain\n"
		"\n"
		"\ntest";

	received = feed_bytes(parser, invalid_status_response2);

	TEST_CHECK(std::get<2>(received) == true);

	parser.reset();

	// make sure we support content-range responses
	// and that we're case insensitive
	char const* one_hundred_response =
		"HTTP/1.1 100 Continue\n"
		"\r\n"
		"HTTP/1.1 200 OK\n"
		"Content-Length: 4\r\n"
		"Content-Type: test/plain\r\n"
		"\r\n"
		"test";

	received = feed_bytes(parser, one_hundred_response);

	TEST_CHECK(received == std::make_tuple(4, int(strlen(one_hundred_response) - 4), false));
	TEST_EQUAL(parser.content_length(), 4);

	{
		// test chunked encoding parser
		char const chunk_header1[] = "f;this is a comment\r\n";
		std::int64_t chunk_size;
		int header_size;
		bool ret = parser.parse_chunk_header(span<char const>(chunk_header1, 10)
			, &chunk_size, &header_size);
		TEST_EQUAL(ret, false);
		ret = parser.parse_chunk_header(span<char const>(chunk_header1, sizeof(chunk_header1))
			, &chunk_size, &header_size);
		TEST_EQUAL(ret, true);
		TEST_EQUAL(chunk_size, 15);
		TEST_EQUAL(header_size, sizeof(chunk_header1) - 1);

		char const chunk_header2[] =
			"0;this is a comment\r\n"
			"test1: foo\r\n"
			"test2: bar\r\n"
			"\r\n";

		ret = parser.parse_chunk_header(span<char const>(chunk_header2, sizeof(chunk_header2))
			, &chunk_size, &header_size);
		TEST_EQUAL(ret, true);
		TEST_EQUAL(chunk_size, 0);
		TEST_EQUAL(header_size, sizeof(chunk_header2) - 1);

		TEST_EQUAL(parser.headers().find("test1")->second, "foo");
		TEST_EQUAL(parser.headers().find("test2")->second, "bar");
	}

	// test url parsing

	error_code ec;
	TEST_CHECK(parse_url_components("http://foo:bar@host.com:80/path/to/file", ec)
		== std::make_tuple("http", "foo:bar", "host.com", 80, "/path/to/file"));

	TEST_CHECK(parse_url_components("http://host.com/path/to/file", ec)
		== std::make_tuple("http", "", "host.com", -1, "/path/to/file"));

	TEST_CHECK(parse_url_components("ftp://host.com:21/path/to/file", ec)
		== std::make_tuple("ftp", "", "host.com", 21, "/path/to/file"));

	TEST_CHECK(parse_url_components("http://host.com/path?foo:bar@foo:", ec)
		== std::make_tuple("http", "", "host.com", -1, "/path?foo:bar@foo:"));

	TEST_CHECK(parse_url_components("http://192.168.0.1/path/to/file", ec)
		== std::make_tuple("http", "", "192.168.0.1", -1, "/path/to/file"));

	TEST_CHECK(parse_url_components("http://[2001:ff00::1]:42/path/to/file", ec)
		== std::make_tuple("http", "", "2001:ff00::1", 42, "/path/to/file"));

	// leading spaces are supposed to be stripped
	TEST_CHECK(parse_url_components(" \thttp://[2001:ff00::1]:42/path/to/file", ec)
		== std::make_tuple("http", "", "2001:ff00::1", 42, "/path/to/file"));

	parse_url_components("http://[2001:ff00::1:42/path/to/file", ec);
	TEST_CHECK(ec == error_code(errors::expected_close_bracket_in_address));

	parse_url_components("http:/", ec);
	TEST_CHECK(ec == error_code(errors::unsupported_url_protocol));
	ec.clear();

	parse_url_components("http:", ec);
	TEST_CHECK(ec == error_code(errors::unsupported_url_protocol));
	ec.clear();

	// test resolve_redirect_location

	TEST_EQUAL(resolve_redirect_location("http://example.com/a/b", "a")
		, "http://example.com/a/a");

	TEST_EQUAL(resolve_redirect_location("http://example.com/a/b", "c/d/e/")
		, "http://example.com/a/c/d/e/");

	TEST_EQUAL(resolve_redirect_location("http://example.com/a/b", "../a")
		, "http://example.com/a/../a");

	TEST_EQUAL(resolve_redirect_location("http://example.com/a/b", "/c")
		, "http://example.com/c");

	TEST_EQUAL(resolve_redirect_location("http://example.com/a/b", "http://test.com/d")
		, "http://test.com/d");

	TEST_EQUAL(resolve_redirect_location("my-custom-scheme://example.com/a/b", "http://test.com/d")
		, "http://test.com/d");

	TEST_EQUAL(resolve_redirect_location("http://example.com", "/d")
		, "http://example.com/d");

	TEST_EQUAL(resolve_redirect_location("http://example.com", "d")
		, "http://example.com/d");

	TEST_EQUAL(resolve_redirect_location("my-custom-scheme://example.com/a/b", "/d")
		, "my-custom-scheme://example.com/d");

	TEST_EQUAL(resolve_redirect_location("my-custom-scheme://example.com/a/b", "c/d")
		, "my-custom-scheme://example.com/a/c/d");

	// if the referrer is invalid, just respond the verbatim location

	TEST_EQUAL(resolve_redirect_location("example.com/a/b", "/c/d")
		, "/c/d");

	// is_ok_status

	TEST_EQUAL(is_ok_status(200), true);
	TEST_EQUAL(is_ok_status(206), true);
	TEST_EQUAL(is_ok_status(299), false);
	TEST_EQUAL(is_ok_status(300), true);
	TEST_EQUAL(is_ok_status(399), true);
	TEST_EQUAL(is_ok_status(400), false);
	TEST_EQUAL(is_ok_status(299), false);

	// is_redirect

	TEST_EQUAL(is_redirect(299), false);
	TEST_EQUAL(is_redirect(100), false);
	TEST_EQUAL(is_redirect(300), true);
	TEST_EQUAL(is_redirect(399), true);
	TEST_EQUAL(is_redirect(400), false);
}

TORRENT_TEST(chunked_encoding)
{
	char const* chunked_input =
		"HTTP/1.1 200 OK\r\n"
		"Transfer-Encoding: chunked\r\n"
		"Content-Type: text/plain\r\n"
		"\r\n"
		"4\r\ntest\r\n4\r\n1234\r\n10\r\n0123456789abcdef\r\n"
		"0\r\n\r\n";

	http_parser parser;
	std::tuple<int, int, bool> const received
		= feed_bytes(parser, chunked_input);

	TEST_EQUAL(strlen(chunked_input), 24 + 94)
	TEST_CHECK(received == std::make_tuple(24, 94, false));
	TEST_CHECK(parser.finished());

	char mutable_buffer[100];
	span<char const> body = parser.get_body();
	memcpy(mutable_buffer, body.begin(), body.size());
	int const len = parser.collapse_chunk_headers(mutable_buffer, int(body.size()));

	TEST_CHECK(std::equal(mutable_buffer, mutable_buffer + len, "test12340123456789abcdef"));
}

TORRENT_TEST(invalid_content_length)
{
	char const* chunked_input =
		"HTTP/1.1 200 OK\r\n"
		"Transfer-Encoding: chunked\r\n"
		"Content-Length: -45345\r\n"
		"\r\n";

	http_parser parser;
	std::tuple<int, int, bool> const received
		= feed_bytes(parser, chunked_input);

	TEST_CHECK(std::get<2>(received) == true);
}

TORRENT_TEST(invalid_chunked)
{
	char const* chunked_input =
		"HTTP/1.1 200 OK\r\n"
		"Transfer-Encoding: chunked\r\n"
		"\r\n"
		"-53465234545\r\n"
		"foobar";

	http_parser parser;
	std::tuple<int, int, bool> const received
		= feed_bytes(parser, chunked_input);

	TEST_CHECK(std::get<2>(received) == true);
}

TORRENT_TEST(invalid_content_range_start)
{
	char const* chunked_input =
		"HTTP/1.1 206 OK\n"
		"Content-Range: bYTes -3-4\n"
		"\n";

	http_parser parser;
	std::tuple<int, int, bool> const received
		= feed_bytes(parser, chunked_input);

	TEST_CHECK(std::get<2>(received) == true);
}

TORRENT_TEST(invalid_content_range_end)
{
	char const* chunked_input =
		"HTTP/1.1 206 OK\n"
		"Content-Range: bYTes 3--434\n"
		"\n";

	http_parser parser;
	std::tuple<int, int, bool> const received
		= feed_bytes(parser, chunked_input);

	TEST_CHECK(std::get<2>(received) == true);
}

TORRENT_TEST(invalid_chunk_afl)
{
	std::uint8_t const invalid_chunked_input[] = {
		0x48, 0x6f, 0x54, 0x50, 0x2f, 0x31, 0x2e, 0x31, // HoTP/1.1 200 OK
		0x20, 0x32, 0x30, 0x30, 0x20, 0x4f, 0x4b, 0x0d, // Cont-Length: 20
		0x0a, 0x43, 0x6f, 0x6e, 0x74, 0x2d, 0x4c, 0x65, // Contente: tn
		0x6e, 0x67, 0x74, 0x68, 0x3a, 0x20, 0x32, 0x30, // Transfer-Encoding: chunked
		0x0d, 0x0a, 0x43, 0x6f, 0x6e, 0x74, 0x65, 0x6e, //
		0x74, 0x65, 0x3a, 0x20, 0x74, 0x6e, 0x0d, 0x0a, //
		0x54, 0x72, 0x61, 0x6e, 0x73, 0x66, 0x65, 0x72, //
		0x2d, 0x45, 0x6e, 0x63, 0x6f, 0x64, 0x69, 0x6e, // -89abc9abcdef
		0x67, 0x3a, 0x20, 0x63, 0x68, 0x75, 0x6e, 0x6b, // �
		0x65, 0x64, 0x0d, 0x0a, 0x0d, 0x0d, 0x0a, 0x0d, // T����������def
		0x0a, 0x0a, 0x2d, 0x38, 0x39, 0x61, 0x62, 0x63, // �
		0x39, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x0d, // T�����������est-headyr: foobar
		0x0a, 0xd6, 0x0d, 0x0a, 0x54, 0xbd, 0xbd, 0xbd,
		0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0x64,
		0x65, 0x66, 0x0d, 0x0a, 0xd6, 0x0d, 0x0a, 0x54,
		0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd,
		0xbd, 0xbd, 0xbd, 0x65, 0x73, 0x74, 0x2d, 0x68,
		0x65, 0x61, 0x64, 0x79, 0x72, 0x3a, 0x20, 0x66,
		0x6f, 0x6f, 0x62, 0x61, 0x72, 0x0d, 0x0a, 0x0d,
		0x0a, 0x00
	};

	http_parser parser;
	std::tuple<int, int, bool> const received
		= feed_bytes(parser, reinterpret_cast<char const*>(invalid_chunked_input));

	TEST_CHECK(std::get<2>(received) == true);
}