NetServices: add testserver.py and proxy.py test infrastructure

This adds the existing testing facilities to the netservices2kit.

Change-Id: Idd884a800abda967bc4b65a416a5f6d927f37450

src/tests/kits/net/netservices2/HttpProtocolTest.cpp

@@ -11,6 +11,7 @@
 #include <cppunit/TestAssert.h>
 #include <cppunit/TestCaller.h>
 #include <cppunit/TestSuite.h>
+#include <tools/cppunit/ThreadedTestCaller.h>
 
 #include <HttpFields.h>
 #include <HttpRequest.h>
@@ -316,8 +317,82 @@ HttpProtocolTest::HttpRequestStreamTest()
 }
 
 
+/* static */ void
+HttpProtocolTest::AddTests(BTestSuite& parent)
+{
+	CppUnit::TestSuite& suite = *new CppUnit::TestSuite("HttpProtocolTest");
+
+	suite.addTest(new CppUnit::TestCaller<HttpProtocolTest>(
+		"HttpProtocolTest::HttpFieldsTest", &HttpProtocolTest::HttpFieldsTest));
+	suite.addTest(new CppUnit::TestCaller<HttpProtocolTest>(
+		"HttpProtocolTest::HttpMethodTest", &HttpProtocolTest::HttpMethodTest));
+	suite.addTest(new CppUnit::TestCaller<HttpProtocolTest>(
+		"HttpProtocolTest::HttpRequestTest", &HttpProtocolTest::HttpRequestTest));
+	suite.addTest(new CppUnit::TestCaller<HttpProtocolTest>(
+		"HttpProtocolTest::HttpRequestStreamTest", &HttpProtocolTest::HttpRequestStreamTest));
+
+	parent.addTest("HttpProtocolTest", &suite);
+}
+
+
+
+// HttpIntegrationTest
+
+
+HttpIntegrationTest::HttpIntegrationTest(TestServerMode mode)
+	: fTestServer(mode)
+{
+
+}
+
+
 void
-HttpProtocolTest::HttpIntegrationTest()
+HttpIntegrationTest::setUp()
+{
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"Starting up test server",
+		B_OK,
+		fTestServer.Start());
+}
+
+
+/* static */ void
+HttpIntegrationTest::AddTests(BTestSuite& parent)
+{
+	// Http
+	{
+		CppUnit::TestSuite& suite = *new CppUnit::TestSuite("HttpIntegrationTest");
+
+		HttpIntegrationTest* httpIntegrationTest = new HttpIntegrationTest(TestServerMode::Http);
+		BThreadedTestCaller<HttpIntegrationTest>* testCaller
+			= new BThreadedTestCaller<HttpIntegrationTest>("HttpTest::", httpIntegrationTest);
+
+		// HTTP
+		testCaller->addThread("HostAndNetworkFailTest", &HttpIntegrationTest::HostAndNetworkFailTest);
+
+		suite.addTest(testCaller);
+		parent.addTest("HttpIntegrationTest", &suite);
+	}
+
+	// Https
+	{
+		CppUnit::TestSuite& suite = *new CppUnit::TestSuite("HttpsIntegrationTest");
+
+		HttpIntegrationTest* httpsIntegrationTest = new HttpIntegrationTest(TestServerMode::Https);
+		BThreadedTestCaller<HttpIntegrationTest>* testCaller
+			= new BThreadedTestCaller<HttpIntegrationTest>("HttpsTest::", httpsIntegrationTest);
+
+		// HTTP
+		testCaller->addThread("HostAndNetworkFailTest", &HttpIntegrationTest::HostAndNetworkFailTest);
+
+		suite.addTest(testCaller);
+		parent.addTest("HttpsIntegrationTest", &suite);
+	}
+}
+
+
+void
+HttpIntegrationTest::HostAndNetworkFailTest()
 {
 	// Test hostname resolution fail
 	{
@@ -362,23 +437,3 @@ HttpProtocolTest::HttpIntegrationTest()
 		}
 	}
 }
-
-
-/* static */ void
-HttpProtocolTest::AddTests(BTestSuite& parent)
-{
-	CppUnit::TestSuite& suite = *new CppUnit::TestSuite("HttpProtocolTest");
-
-	suite.addTest(new CppUnit::TestCaller<HttpProtocolTest>(
-		"HttpProtocolTest::HttpFieldsTest", &HttpProtocolTest::HttpFieldsTest));
-	suite.addTest(new CppUnit::TestCaller<HttpProtocolTest>(
-		"HttpProtocolTest::HttpMethodTest", &HttpProtocolTest::HttpMethodTest));
-	suite.addTest(new CppUnit::TestCaller<HttpProtocolTest>(
-		"HttpProtocolTest::HttpRequestTest", &HttpProtocolTest::HttpRequestTest));
-	suite.addTest(new CppUnit::TestCaller<HttpProtocolTest>(
-		"HttpProtocolTest::HttpRequestStreamTest", &HttpProtocolTest::HttpRequestStreamTest));
-	suite.addTest(new CppUnit::TestCaller<HttpProtocolTest>(
-		"HttpProtocolTest::HttpIntegrationTest", &HttpProtocolTest::HttpIntegrationTest));
-
-	parent.addTest("HttpProtocolTest", &suite);
-}

src/tests/kits/net/netservices2/HttpProtocolTest.h

@@ -9,6 +9,9 @@
 #include <HttpSession.h>
 #include <TestCase.h>
 #include <TestSuite.h>
+#include <tools/cppunit/ThreadedTestCase.h>
+
+#include "TestServer.h"
 
 using BPrivate::Network::BHttpSession;
 
@@ -21,13 +24,26 @@ public:
 			void	HttpMethodTest();
 			void	HttpRequestTest();
 			void	HttpRequestStreamTest();
-			void	HttpIntegrationTest();
+
+	static	void	AddTests(BTestSuite& suite);
+};
+
+
+class HttpIntegrationTest : public BThreadedTestCase
+{
+public:
+					HttpIntegrationTest(TestServerMode mode);
+
+	virtual	void		setUp() override;
+
+
+			void	HostAndNetworkFailTest();
 
 	static	void	AddTests(BTestSuite& suite);
 
 private:
-	BHttpSession	fSession;
+			TestServer		fTestServer;
+			BHttpSession	fSession;
 };
 
-
 #endif

src/tests/kits/net/netservices2/Jamfile

@@ -2,14 +2,13 @@ SubDir HAIKU_TOP src tests kits net netservices2 ;
 
 if $(TARGET_PACKAGING_ARCH) != x86_gcc2 {
 	# do not target the legacy platform
-	UsePrivateHeaders netservices2 ;
-
-	SubDirC++Flags -std=gnu++17 ;
+	UsePrivateHeaders netservices2 shared ;
 
 	UnitTestLib netservicekit2test.so :
 		ServicesKitTestAddon.cpp
 
 		HttpProtocolTest.cpp
+		TestServer.cpp
 
 		: be libnetservices2.a $(TARGET_NETWORK_LIBS) $(HAIKU_NETAPI_LIB)
 		[ TargetLibstdc++ ]

src/tests/kits/net/netservices2/ServicesKitTestAddon.cpp

@@ -16,6 +16,7 @@ getTestSuite()
 	BTestSuite* suite = new BTestSuite("NetServices2Kit");
 
 	HttpProtocolTest::AddTests(*suite);
+	HttpIntegrationTest::AddTests(*suite);
 
 	return suite;
 }

src/tests/kits/net/netservices2/TestServer.cpp

@@ -0,0 +1,333 @@
+/*
+ * Copyright 2020 Haiku, Inc. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *   Kyle Ambroff-Kao, [email protected]
+ */
+#include "TestServer.h"
+
+#include <errno.h>
+#include <netinet/in.h>
+#include <posix/libgen.h>
+#include <sstream>
+#include <string>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <vector>
+
+#include <AutoDeleter.h>
+#include <TestShell.h>
+
+
+namespace {
+
+template <typename T>
+std::string to_string(T value)
+{
+	std::ostringstream s;
+	s << value;
+	return s.str();
+}
+
+
+void exec(const std::vector<std::string>& args)
+{
+	const char** argv = new const char*[args.size() + 1];
+	ArrayDeleter<const char*> _(argv);
+
+	for (size_t i = 0; i < args.size(); ++i) {
+		argv[i] = args[i].c_str();
+	}
+	argv[args.size()] = NULL;
+
+	execv(args[0].c_str(), const_cast<char* const*>(argv));
+}
+
+
+// Return the path of a file path relative to this source file.
+std::string TestFilePath(const std::string& relativePath)
+{
+	char *testFileSource = strdup(__FILE__);
+	MemoryDeleter _(testFileSource);
+
+	std::string testSrcDir(::dirname(testFileSource));
+
+	return testSrcDir + "/" + relativePath;
+}
+
+}
+
+
+RandomTCPServerPort::RandomTCPServerPort()
+	:
+	fInitStatus(B_NOT_INITIALIZED),
+	fSocketFd(-1),
+	fServerPort(0)
+{
+	// Create socket with port 0 to get an unused one selected by the
+	// kernel.
+	int socket_fd = ::socket(AF_INET, SOCK_STREAM, 0);
+	if (socket_fd == -1) {
+		fprintf(
+			stderr,
+			"ERROR: Unable to create socket: %s\n",
+			strerror(errno));
+		fInitStatus = B_ERROR;
+		return;
+	}
+
+	fSocketFd = socket_fd;
+
+	// We may quickly reclaim the same socket between test runs, so allow
+	// for reuse.
+	{
+		int reuse = 1;
+		int result = ::setsockopt(
+			socket_fd,
+			SOL_SOCKET,
+			SO_REUSEPORT,
+			&reuse,
+			sizeof(reuse));
+		if (result == -1) {
+			fInitStatus = errno;
+			fprintf(
+				stderr,
+				"ERROR: Unable to set socket options on fd %d: %s\n",
+				socket_fd,
+				strerror(fInitStatus));
+			return;
+		}
+	}
+
+	// Bind to loopback 127.0.0.1
+	struct sockaddr_in server_address;
+	server_address.sin_family = AF_INET;
+	server_address.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+	int bind_result = ::bind(
+		socket_fd,
+		reinterpret_cast<struct sockaddr*>(&server_address),
+		sizeof(server_address));
+	if (bind_result == -1) {
+		fInitStatus = errno;
+		fprintf(
+			stderr,
+			"ERROR: Unable to bind to loopback interface: %s\n",
+			strerror(fInitStatus));
+		return;
+	}
+
+	// Listen is apparently required before getsockname will work.
+	if (::listen(socket_fd, 32) == -1) {
+		fInitStatus = errno;
+		fprintf(stderr, "ERROR: listen() failed: %s\n", strerror(fInitStatus));
+
+		return;
+	}
+
+	// Now get the port from the socket.
+	socklen_t server_address_length = sizeof(server_address);
+	::getsockname(
+		socket_fd,
+		reinterpret_cast<struct sockaddr*>(&server_address),
+		&server_address_length);
+	fServerPort = ntohs(server_address.sin_port);
+
+	fInitStatus = B_OK;
+}
+
+
+RandomTCPServerPort::~RandomTCPServerPort()
+{
+	if (fSocketFd != -1) {
+		::close(fSocketFd);
+		fSocketFd = -1;
+		fInitStatus = B_NOT_INITIALIZED;
+	}
+}
+
+
+status_t RandomTCPServerPort::InitCheck() const
+{
+	return fInitStatus;
+}
+
+
+int RandomTCPServerPort::FileDescriptor() const
+{
+	return fSocketFd;
+}
+
+
+uint16_t RandomTCPServerPort::Port() const
+{
+	return fServerPort;
+}
+
+
+ChildProcess::ChildProcess()
+	:
+	fChildPid(-1)
+{
+}
+
+
+ChildProcess::~ChildProcess()
+{
+	if (fChildPid != -1) {
+		::kill(fChildPid, SIGTERM);
+
+		pid_t result = -1;
+		while (result != fChildPid) {
+			result = ::waitpid(fChildPid, NULL, 0);
+		}
+	}
+}
+
+
+// The job of this method is to spawn a child process that will later be killed
+// by the destructor.
+status_t ChildProcess::Start(const std::vector<std::string>& args)
+{
+	if (fChildPid != -1) {
+		return B_ALREADY_RUNNING;
+	}
+
+	pid_t child = ::fork();
+	if (child < 0)
+		return B_ERROR;
+
+	if (child > 0) {
+		fChildPid = child;
+		return B_OK;
+	}
+
+	// This is the child process. We can exec image provided in args.
+	exec(args);
+
+	// If we reach this point we failed to load the Python image.
+	std::ostringstream ostr;
+
+	for (std::vector<std::string>::const_iterator iter = args.begin();
+		 iter != args.end();
+		 ++iter) {
+		ostr << " " << *iter;
+	}
+
+	fprintf(
+		stderr,
+		"Unable to spawn `%s': %s\n",
+		ostr.str().c_str(),
+		strerror(errno));
+	exit(1);
+}
+
+
+TestServer::TestServer(TestServerMode mode)
+	:
+	fMode(mode)
+{
+}
+
+
+// Start a child testserver.py process with the random TCP port chosen by
+// fPort.
+status_t TestServer::Start()
+{
+	if (fPort.InitCheck() != B_OK) {
+		return fPort.InitCheck();
+	}
+
+	auto testFilePath = TestFilePath("testserver.py");
+	if (::access(testFilePath.data(), R_OK) != 0) {
+		fprintf(
+			stderr,
+			"ERROR: No access to the test server script at: %s\n",
+			testFilePath.data()); 
+		return B_IO_ERROR;
+	}
+
+	// This is the child process. We can exec the server process.
+	std::vector<std::string> child_process_args;
+	child_process_args.push_back("/bin/python3");
+	child_process_args.push_back(testFilePath);
+	child_process_args.push_back("--port");
+	child_process_args.push_back(to_string(fPort.Port()));
+	child_process_args.push_back("--fd");
+	child_process_args.push_back(to_string(fPort.FileDescriptor()));
+
+	if (fMode == TestServerMode::Https) {
+		child_process_args.push_back("--use-tls");
+	}
+
+	// After this the child process has started. It may take a short amount of
+	// time before the child process is ready to call accept(), but that's OK.
+	//
+	// Since the socket has already been created above, the tests will not
+	// get ECONNREFUSED and will block until the child process calls
+	// accept(). So we don't have to busy loop here waiting for a
+	// connection to the child.
+	return fChildProcess.Start(child_process_args);
+}
+
+
+BUrl TestServer::BaseUrl() const
+{
+	std::string scheme;
+	switch(fMode) {
+	case TestServerMode::Http:
+		scheme = "http://";
+		break;
+
+	case TestServerMode::Https:
+		scheme = "https://";
+		break;
+	}
+
+	std::string port_string = to_string(fPort.Port());
+
+	std::string baseUrl = scheme + "127.0.0.1:" + port_string + "/";
+	return BUrl(baseUrl.c_str());
+}
+
+
+// Start a child proxy.py process using the random TCP port chosen by fPort.
+status_t TestProxyServer::Start()
+{
+	if (fPort.InitCheck() != B_OK) {
+		return fPort.InitCheck();
+	}
+
+	auto testFilePath = TestFilePath("proxy.py");
+	if (::access(testFilePath.data(), R_OK) != 0) {
+		fprintf(
+			stderr,
+			"ERROR: No access to the test server script at: %s\n",
+			testFilePath.data()); 
+		return B_IO_ERROR;
+	}
+
+	std::vector<std::string> child_process_args;
+	child_process_args.push_back("/bin/python3");
+	child_process_args.push_back(testFilePath);
+	child_process_args.push_back("--port");
+	child_process_args.push_back(to_string(fPort.Port()));
+	child_process_args.push_back("--fd");
+	child_process_args.push_back(to_string(fPort.FileDescriptor()));
+
+	// After this the child process has started. It may take a short amount of
+	// time before the child process is ready to call accept(), but that's OK.
+	//
+	// Since the socket has already been created above, the tests will not
+	// get ECONNREFUSED and will block until the child process calls
+	// accept(). So we don't have to busy loop here waiting for a
+	// connection to the child.
+	return fChildProcess.Start(child_process_args);
+}
+
+
+uint16_t TestProxyServer::Port() const
+{
+	return fPort.Port();
+}

src/tests/kits/net/netservices2/TestServer.h

@@ -0,0 +1,77 @@
+/*
+ * Copyright 2020 Haiku, Inc. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *   Kyle Ambroff-Kao, [email protected]
+ */
+#ifndef TEST_SERVER_H
+#define TEST_SERVER_H
+
+#include <string>
+#include <vector>
+
+#include <os/support/SupportDefs.h>
+#include <os/support/Url.h>
+
+
+// Binds to a random unused TCP port.
+class RandomTCPServerPort {
+public:
+						RandomTCPServerPort();
+						~RandomTCPServerPort();
+
+	status_t			InitCheck()							const;
+	int					FileDescriptor()					const;
+	uint16_t			Port()								const;
+
+private:
+	status_t			fInitStatus;
+	int					fSocketFd;
+	uint16_t			fServerPort;
+};
+
+
+class ChildProcess {
+public:
+						ChildProcess();
+						~ChildProcess();
+
+	status_t			Start(const std::vector<std::string>& args);
+private:
+	pid_t				fChildPid;
+};
+
+
+enum class TestServerMode {
+	Http,
+	Https,
+};
+
+
+class TestServer {
+public:
+						TestServer(TestServerMode mode);
+
+	status_t			Start();
+	BUrl				BaseUrl()							const;
+
+private:
+	TestServerMode		fMode;
+	ChildProcess		fChildProcess;
+	RandomTCPServerPort fPort;
+};
+
+
+class TestProxyServer {
+public:
+	status_t			Start();
+	uint16_t			Port()								const;
+
+private:
+	ChildProcess		fChildProcess;
+	RandomTCPServerPort	fPort;
+};
+
+
+#endif // TEST_SERVER_H

src/tests/kits/net/netservices2/proxy.py

@@ -0,0 +1,201 @@
+#
+# Copyright 2020 Haiku, Inc. All rights reserved.
+# Distributed under the terms of the MIT License.
+#
+# Authors:
+#  Kyle Ambroff-Kao, [email protected]
+#
+
+"""
+Transparent HTTP proxy.
+"""
+
+import http.client
+import http.server
+import optparse
+import socket
+import sys
+import urllib.parse
+
+
+class RequestHandler(http.server.BaseHTTPRequestHandler):
+    """
+    Implement the basic requirements for a transparent HTTP proxy as defined
+    by RFC 7230. Enough of the functionality is implemented to support the
+    integration tests in HttpTest that use the HTTP proxy feature.
+
+    There are many error conditions and failure modes which are not handled.
+    Those cases can be added as the test suite expands to handle more error
+    cases.
+    """
+    def __init__(self, *args, **kwargs):
+        # This is used to hold on to persistent connections to the downstream
+        # servers. This maps downstream_host:port => HTTPConnection
+        #
+        # This implementation is not thread safe, but that's OK we only have
+        # a single thread anyway.
+        self._connections = {}
+
+        super(RequestHandler, self).__init__(*args, **kwargs)
+
+    def _proxy_request(self):
+        # Extract the downstream server from the request path.
+        #
+        # Note that no attempt is made to prevent message forwarding loops
+        # here. This doesn't need to be a complete proxy implementation, just
+        # enough of one for integration tests. RFC 7230 section 5.7 says if
+        # this were a complete implementation, it would have to make sure that
+        # the target system was not this process to avoid a loop.
+        target = urllib.parse.urlparse(self.path)
+
+        # If Connection: close wasn't used, then we may still have a connection
+        # to this downstream server handy.
+        conn = self._connections.get(target.netloc, None)
+        if conn is None:
+            conn = http.client.HTTPConnection(target.netloc)
+
+        # Collect headers from client which will be sent to the downstream
+        # server.
+        client_headers = {}
+        for header_name in self.headers:
+            if header_name in ('Host', 'Content-Length'):
+                continue
+            for header_value in self.headers.get_all(header_name):
+                client_headers[header_name] = header_value
+
+        # Compute X-Forwarded-For header
+        client_address = '{}:{}'.format(*self.client_address)
+        x_forwarded_for_header = self.headers.get('X-Forwarded-For', None)
+        if x_forwarded_for_header is None:
+            client_headers['X-Forwarded-For'] = client_address
+        else:
+            client_headers['X-Forwarded-For'] = \
+                x_forwarded_for_header + ', ' + client_address
+
+        # Read the request body from client.
+        request_body_length = int(self.headers.get('Content-Length', '0'))
+        request_body = self.rfile.read(request_body_length)
+
+        # Send the request to the downstream server
+        if target.query:
+            target_path = target.path + '?' + target.query
+        else:
+            target_path = target.path
+        conn.request(self.command, target_path, request_body, client_headers)
+        response = conn.getresponse()
+
+        # Echo the response to the client.
+        self.send_response_only(response.status, response.reason)
+        for header_name, header_value in response.headers.items():
+            self.send_header(header_name, header_value)
+        self.end_headers()
+
+        # Read the response body from upstream and write it to downstream, if
+        # there is a response body at all.
+        response_content_length = \
+            int(response.headers.get('Content-Length', '0'))
+        if response_content_length > 0:
+            self.wfile.write(response.read(response_content_length))
+
+        # Cleanup, possibly hang on to persistent connection to target
+        # server.
+        connection_header_value = self.headers.get('Connection', None)
+        if response.will_close or connection_header_value == 'close':
+            conn.close()
+            self.close_connection = True
+        else:
+            # Hang on to this connection for future requests. This isn't
+            # really bulletproof but it's good enough for integration tests.
+            self._connections[target.netloc] = conn
+
+        self.log_message(
+            'Proxied request from %s to %s',
+            client_address,
+            self.path)
+
+    def do_GET(self):
+        self._proxy_request()
+
+    def do_HEAD(self):
+        self._proxy_request()
+
+    def do_POST(self):
+        self._proxy_request()
+
+    def do_PUT(self):
+        self._proxy_request()
+
+    def do_DELETE(self):
+        self._proxy_request()
+
+    def do_PATCH(self):
+        self._proxy_request()
+
+    def do_OPTIONS(self):
+        self._proxy_request()
+
+
+def main():
+    options = parse_args(sys.argv)
+
+    bind_addr = (
+        options.bind_addr,
+        0 if options.port is None else options.port)
+
+    server = http.server.HTTPServer(
+        bind_addr,
+        RequestHandler,
+        bind_and_activate=False)
+    if options.port is None:
+        server.server_port = server.socket.getsockname()[1]
+    else:
+        server.server_port = options.port
+
+    if options.server_socket_fd:
+        server.socket = socket.fromfd(
+            options.server_socket_fd,
+            socket.AF_INET,
+            socket.SOCK_STREAM)
+    else:
+        server.server_bind()
+        server.server_activate()
+
+    print(
+        'Transparent HTTP proxy listening on port',
+        server.server_port,
+        file=sys.stderr)
+    try:
+        server.serve_forever(0.01)
+    except KeyboardInterrupt:
+        server.server_close()
+
+
+def parse_args(argv):
+    parser = optparse.OptionParser(
+        usage='Usage: %prog [OPTIONS]',
+        description=__doc__)
+    parser.add_option(
+        '--bind-addr',
+        default='127.0.0.1',
+        dest='bind_addr',
+        help='By default only bind to loopback')
+    parser.add_option(
+        '--port',
+        dest='port',
+        default=None,
+        type='int',
+        help='If not specified a random port will be used.')
+    parser.add_option(
+        "--fd",
+        dest='server_socket_fd',
+        default=None,
+        type='int',
+        help='A socket FD to use for accept() instead of binding a new one.')
+    options, args = parser.parse_args(argv)
+    if len(args) > 1:
+        parser.error('Unexpected arguments: {}'.format(', '.join(args[1:])))
+    return options
+
+
+if __name__ == '__main__':
+    main()

src/tests/kits/net/netservices2/testserver.py

@@ -0,0 +1,541 @@
+#
+# Copyright 2020 Haiku, Inc. All rights reserved.
+# Distributed under the terms of the MIT License.
+#
+# Authors:
+#  Kyle Ambroff-Kao, [email protected]
+#
+
+"""
+HTTP(S) server used for integration testing of ServicesKit.
+
+This service receives HTTP requests and just echos them back in the response.
+
+This is intentionally not using any fancy frameworks or libraries so as to not
+require any dependencies, and also to allow for adding endpoints to replicate
+behavior of other servers in the future.
+"""
+
+import abc
+import base64
+import gzip
+import hashlib
+import http.server
+import io
+import optparse
+import os
+import re
+import socket
+import ssl
+import subprocess
+import sys
+import tempfile
+import zlib
+
+
+MULTIPART_FORM_BOUNDARY_RE = re.compile(
+    r'^multipart/form-data; boundary=(----------------------------\d+)$')
+AUTH_PATH_RE = re.compile(
+    r'^/auth/(?P<strategy>(basic|digest))'
+    '/(?P<username>[a-z0-9]+)/(?P<password>[a-z0-9]+)',
+    re.IGNORECASE)
+
+
+class RequestHandler(http.server.BaseHTTPRequestHandler):
+    """
+    Any GET or POST request just gets echoed back to the sender. If the path
+    ends with a numeric component like "/404" or "/500", then that value will
+    be set as the status code in the response.
+
+    Note that this isn't meant to replicate expected functionality exactly.
+    Rather than implementing all of these status codes as expected per RFC,
+    such as having an empty response body for 201 response, only the
+    functionality that is required to handle requests from HttpTests is
+    implemented.
+
+    There can also be endpoints here that are intentionally non-compliant in
+    order to exercize the HTTP client's behavior when a server is badly
+    behaved.
+    """
+    def do_GET(self, write_response=True):
+        authorized, extra_headers = self._authorize()
+        if not authorized:
+            return
+
+        encoding, response_body = self._build_response_body()
+
+        status_code = extract_desired_status_code_from_path(self.path, 200)
+        self.send_response(status_code)
+        if status_code >= 300 and status_code < 400:
+            self.send_header('Location', '/')
+
+        if status_code == 204:
+            write_response = False
+        else:
+            self.send_header('Content-Type', 'text/plain')
+            self.send_header('Content-Length', str(len(response_body)))
+            if encoding:
+                self.send_header('Content-Encoding', encoding)
+
+        for header_name, header_value in extra_headers:
+            self.send_header(header_name, header_value)
+        self.end_headers()
+
+        if write_response:
+            self.wfile.write(response_body)
+
+    def do_HEAD(self):
+        self.do_GET(False)
+
+    def do_POST(self):
+        authorized, extra_headers = self._authorize()
+        if not authorized:
+            return
+
+        encoding, response_body = self._build_response_body()
+        self.send_response(
+            extract_desired_status_code_from_path(self.path, 200))
+        self.send_header('Content-Type', 'text/plain')
+        self.send_header('Content-Length', str(len(response_body)))
+        if encoding:
+            self.send_header('Content-Encoding', encoding)
+        for header_name, header_value in extra_headers:
+            self.send_header(header_name, header_value)
+
+        self.end_headers()
+        self.wfile.write(response_body)
+
+    def do_DELETE(self):
+        self._not_supported()
+
+    def do_PATCH(self):
+        self._not_supported()
+
+    def do_OPTIONS(self):
+        self._not_supported()
+
+    def send_response(self, code, message=None):
+        self.log_request(code)
+        self.send_response_only(code, message)
+        self.send_header('Server', 'Test HTTP Server for Haiku')
+        self.send_header('Date', 'Sun, 09 Feb 2020 19:32:42 GMT')
+
+    def _build_response_body(self):
+        # The post-body may be multi-part/form-data, in which case the client
+        # will have generated some random identifier to identify the boundary.
+        # If that's the case, we'll replace it here in order to allow the test
+        # client to validate the response data without needing to predict the
+        # boundary identifier. This makes the response body deterministic even
+        # though the boundary will change with every request, and lets the
+        # tests in HttpTests hard-code the entire expected response body for
+        # validation.
+        boundary_id_value = None
+
+        supported_encodings = [
+            e.strip()
+            for e in self.headers.get('Accept-Encoding', '').split(',')
+            if e.strip()]
+        if 'gzip' in supported_encodings:
+            encoding = 'gzip'
+            output_stream = GzipResponseBodyBuilder()
+        elif 'deflate' in supported_encodings:
+            encoding = 'deflate'
+            output_stream = DeflateResponseBodyBuilder()
+        else:
+            encoding = None
+            output_stream = RawResponseBodyBuilder()
+
+        output_stream.write(
+            'Path: {}\r\n\r\n'.format(self.path).encode('utf-8'))
+        output_stream.write(b'Headers:\r\n')
+        output_stream.write(b'--------\r\n')
+        for header in self.headers:
+            for header_value in self.headers.get_all(header):
+                if header in ('Host', 'Referer', 'X-Forwarded-For'):
+                    # The server port can change between runs which will change
+                    # the size and contents of the response body. To make tests
+                    # that verify the contents of the response body easier the
+                    # server port will be stripped from these headers when
+                    # echoed to the response body.
+                    header_value = re.sub(r':[0-9]+', ':PORT', header_value)
+
+                    # The scheme will also be in this header value, and we want
+                    # to return the same reguardless of whether http:// or
+                    # https:// was used.
+                    header_value = re.sub(
+                        r'https?://',
+                        'SCHEME://',
+                        header_value)
+                if header == 'Content-Type':
+                    match = MULTIPART_FORM_BOUNDARY_RE.match(
+                        self.headers.get('Content-Type', 'text/plain'))
+                    if match is not None:
+                        boundary_id_value = match.group(1)
+                        header_value = header_value.replace(
+                            boundary_id_value,
+                            '<<BOUNDARY-ID>>')
+                output_stream.write(
+                    '{}: {}\r\n'.format(header, header_value).encode('utf-8'))
+
+        content_length = int(self.headers.get('Content-Length', 0))
+        if content_length > 0:
+            output_stream.write(b'\r\n')
+            output_stream.write(b'Request body:\r\n')
+            output_stream.write(b'-------------\r\n')
+
+            body_bytes = self.rfile.read(content_length).decode('utf-8')
+            if boundary_id_value:
+                body_bytes = body_bytes.replace(
+                    boundary_id_value, '<<BOUNDARY-ID>>')
+
+            output_stream.write(body_bytes.encode('utf-8'))
+            output_stream.write(b'\r\n')
+
+        return encoding, output_stream.get_bytes()
+
+    def _not_supported(self):
+        self.send_response(405, '{} not supported'.format(self.command))
+        self.end_headers()
+        self.wfile.write(
+            '{} not supported\r\n'.format(self.command).encode('utf-8'))
+
+    def _authorize(self):
+        """
+        Authorizes the request. If True is returned that means that the
+        request was not authorized and the 4xx response has been send to the
+        client.
+        """
+        # We only authorize paths like
+        # /auth/<strategy>/<expected-username>/<expected-password>
+        match = AUTH_PATH_RE.match(self.path)
+        if match is None:
+            return True, []
+
+        strategy = match.group('strategy')
+        expected_username = match.group('username')
+        expected_password = match.group('password')
+
+        if strategy == 'basic':
+            return self._handle_basic_auth(
+                expected_username,
+                expected_password)
+        elif strategy == 'digest':
+            return self._handle_digest_auth(
+                expected_username,
+                expected_password)
+        else:
+            raise NotImplementedError(
+                'Unimplemented authorization strategy ' + strategy)
+
+    def _handle_basic_auth(self, expected_username, expected_password):
+        authorization = self.headers.get('Authorization', None)
+        auth_type = None
+        encoded_credentials = None
+        username = None
+        password = None
+
+        if authorization:
+            auth_type, encoded_credentials = authorization.split()
+
+        if encoded_credentials is not None:
+            decoded = base64.decodebytes(encoded_credentials.encode('utf-8'))
+            username, password = decoded.decode('utf-8').split(':')
+
+        if authorization is None or auth_type != 'Basic' \
+                or encoded_credentials is None \
+                or username != expected_username \
+                or password != expected_password:
+            self.send_response(401, 'Not authorized')
+            self.send_header('Www-Authenticate', 'Basic realm="Fake Realm"')
+            self.end_headers()
+            return False, []
+
+        return True, [('Www-Authenticate', 'Basic realm="Fake Realm"')]
+
+    def _handle_digest_auth(self, expected_username, expected_password):
+        """
+        Implement enough of the digest auth RFC to make tests pass.
+        """
+        # Note: These values will always be the same because we want the
+        # response to be deterministic for testing purposes.
+        NONCE = 'f3a95f20879dd891a5544bf96a3e5518'
+        OPAQUE = 'f0bb55f1221a51b6d38117c331611799'
+
+        extra_headers = []
+        authorization = self.headers.get('Authorization', None)
+        credentials = None
+        auth_type = None
+        if authorization is not None:
+            auth_type, fields = authorization.split(maxsplit=1)
+            if auth_type == 'Digest':
+                credentials = parse_kv_pair_header(fields)
+
+        expected_response_hash = None
+        if credentials:
+            expected_response_hash = compute_digest_challenge_response_hash(
+                self.command,
+                self.path,
+                '',
+                credentials,
+                expected_password)
+
+        if authorization is None or credentials is None \
+                or auth_type != 'Digest' \
+                or expected_response_hash != credentials.get('response'):
+            self.send_response(401, 'Not authorized')
+            self.send_header(
+                'Www-Authenticate',
+                'Digest realm="user@shredder",'
+                ' nonce="{}",'
+                ' qop="auth",'
+                ' opaque={},'
+                ' algorithm=MD5,'
+                ' stale=FALSE'.format(NONCE, OPAQUE))
+            self.send_header('Set-Cookie', 'stale_after=never; Path=/')
+            self.send_header('Set-Cookie', 'fake=fake_value; Path=/')
+            self.end_headers()
+            return False, extra_headers
+
+        return True, extra_headers
+
+
+class ResponseBodyBuilder(object):
+    __meta__ = abc.ABCMeta
+
+    @abc.abstractmethod
+    def write(self, bytes):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def get_bytes(self):
+        raise NotImplementedError()
+
+
+class RawResponseBodyBuilder(ResponseBodyBuilder):
+    def __init__(self):
+        self.buf = io.BytesIO()
+
+    def write(self, bytes):
+        self.buf.write(bytes)
+
+    def get_bytes(self):
+        return self.buf.getvalue()
+
+
+class GzipResponseBodyBuilder(ResponseBodyBuilder):
+    def __init__(self):
+        self.buf = io.BytesIO()
+        self.compressor = gzip.GzipFile(
+            mode='wb',
+            compresslevel=4,
+            fileobj=self.buf)
+
+    def write(self, bytes):
+        self.compressor.write(bytes)
+
+    def get_bytes(self):
+        self.compressor.close()
+        return self.buf.getvalue()
+
+
+class DeflateResponseBodyBuilder(ResponseBodyBuilder):
+    def __init__(self):
+        self.raw = RawResponseBodyBuilder()
+
+    def write(self, bytes):
+        self.raw.write(bytes)
+
+    def get_bytes(self):
+        return zlib.compress(self.raw.get_bytes())
+
+
+def extract_desired_status_code_from_path(path, default=200):
+    status_code = default
+    path_parts = os.path.split(path)
+    try:
+        status_code = int(path_parts[-1])
+    except ValueError:
+        pass
+    return status_code
+
+
+def generate_self_signed_tls_cert(common_name, cert_path, key_path):
+    subprocess.check_call([
+        'openssl',
+        'req',
+        '-x509',
+        '-nodes',
+        '-subj', '/CN={}'.format(common_name),
+        '-newkey', 'rsa:4096',
+        '-keyout', key_path,
+        '-out', cert_path,
+        '-days', '1'
+    ])
+
+
+def compute_digest_challenge_response_hash(
+        request_method,
+        request_uri,
+        request_body,
+        credentials,
+        expected_password):
+    """
+    Compute hash as defined by RFC2069, although this isn't an attempt to be
+    perfect, just enough for basic integration tests in HttpTests to work.
+
+    :param credentials: Map of values parsed from the Authorization header
+                        from the client.
+    :param expected_password: The known correct password of the user
+                              attempting to authenticate.
+    :return: None if a hash cannot be produced, otherwise the hash as defined
+             by RFC2069.
+    """
+    algorithm = credentials.get('algorithm')
+    if algorithm == 'MD5':
+        hashfunc = hashlib.md5
+    elif algorithm == 'SHA-256':
+        hashfunc = hashlib.sha256
+    elif algorithm == 'SHA-512':
+        hashfunc = hashlib.sha512
+    else:
+        return None
+
+    realm = credentials.get('realm')
+    username = credentials.get('username')
+
+    ha1 = hashfunc(':'.join([
+        username,
+        realm,
+        expected_password]).encode('utf-8')).hexdigest()
+
+    qop = credentials.get('qop')
+    if qop is None or qop == 'auth':
+        ha2 = hashfunc(':'.join([
+            request_method,
+            request_uri]).encode('utf-8')).hexdigest()
+    elif qop == 'auth-int':
+        ha2 = hashfunc(':'.join([
+            request_method,
+            request_uri,
+            request_body]).encode('utf-8')).hexdigest()
+    else:
+        ha2 = None
+
+    if ha1 is None or ha2 is None:
+        return None
+
+    if qop is None:
+        return hashfunc(':'.join([
+            ha1,
+            credentials.get('nonce', ''),
+            ha2]).encode('utf-8')).hexdigest()
+    elif qop == 'auth' or qop == 'auth-int':
+        hash_components = [
+            ha1,
+            credentials.get('nonce', ''),
+            credentials.get('nc', ''),
+            credentials.get('cnonce', ''),
+            qop,
+            ha2]
+        return hashfunc(':'.join(hash_components).encode('utf-8')).hexdigest()
+
+
+def parse_kv_pair_header(header_value, sep=','):
+    d = {}
+    for kvpair in header_value.split(sep):
+        key, value = kvpair.strip().split('=')
+        d[key.strip()] = value.strip().strip('"')
+    return d
+
+
+def main():
+    options = parse_args(sys.argv)
+
+    bind_addr = (
+        options.bind_addr,
+        0 if options.port is None else options.port)
+
+    server = http.server.HTTPServer(
+        bind_addr,
+        RequestHandler,
+        bind_and_activate=False)
+    if options.port is None:
+        server.server_port = server.socket.getsockname()[1]
+    else:
+        server.server_port = options.port
+
+    if options.server_socket_fd:
+        server.socket = socket.fromfd(
+            options.server_socket_fd,
+            socket.AF_INET,
+            socket.SOCK_STREAM)
+
+    def run_server():
+        if not options.server_socket_fd:
+            server.server_bind()
+            server.server_activate()
+        print(
+            'Test server listening on port',
+            server.server_port,
+            file=sys.stderr)
+        server.serve_forever(0.01)
+
+    try:
+        if options.use_tls:
+            with tempfile.TemporaryDirectory() as temp_cert_dir:
+                common_name = options.bind_addr + ':' + str(options.port)
+                cert_file = os.path.join(temp_cert_dir, 'cert.pem')
+                key_file = os.path.join(temp_cert_dir, 'key.pem')
+                generate_self_signed_tls_cert(
+                    common_name,
+                    cert_file,
+                    key_file)
+                server.socket = ssl.wrap_socket(
+                    server.socket,
+                    certfile=cert_file,
+                    keyfile=key_file,
+                    server_side=True,
+                    do_handshake_on_connect=False)
+            run_server()
+        else:
+            run_server()
+    except KeyboardInterrupt:
+        server.server_close()
+
+
+def parse_args(argv):
+    parser = optparse.OptionParser(
+        usage='Usage: %prog [OPTIONS]',
+        description=__doc__)
+    parser.add_option(
+        '--bind-addr',
+        default='127.0.0.1',
+        dest='bind_addr',
+        help='By default only bind to loopback')
+    parser.add_option(
+        '--use-tls',
+        dest='use_tls',
+        default=False,
+        action='store_true',
+        help='If set, a self-signed TLS certificate, key and CA will be'
+        ' generated for testing purposes.')
+    parser.add_option(
+        '--port',
+        dest='port',
+        default=None,
+        type='int',
+        help='If not specified a random port will be used.')
+    parser.add_option(
+        "--fd",
+        dest='server_socket_fd',
+        default=None,
+        type='int',
+        help='A socket FD to use for accept() instead of binding a new one.')
+    options, args = parser.parse_args(argv)
+    if len(args) > 1:
+        parser.error('Unexpected arguments: {}'.format(', '.join(args[1:])))
+    return options
+
+
+if __name__ == '__main__':
+    main()