test/test_proxy.cc

#include <chrono>
#include <future>
#include <gtest/gtest.h>
#include <httplib.h>

using namespace std;
using namespace httplib;

std::string normalizeJson(const std::string &json) {
  std::string result;
  for (char c : json) {
    if (c != ' ' && c != '\t' && c != '\n' && c != '\r') { result += c; }
  }
  return result;
}

template <typename T> void ProxyTest(T &cli, bool basic) {
  cli.set_proxy("localhost", basic ? 3128 : 3129);
  auto res = cli.Get("/get");
  ASSERT_TRUE(res != nullptr);
  EXPECT_EQ(StatusCode::ProxyAuthenticationRequired_407, res->status);
}

TEST(ProxyTest, NoSSLBasic) {
  Client cli("httpbin");
  ProxyTest(cli, true);
}

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(ProxyTest, SSLBasic) {
  SSLClient cli("httpbin");
  cli.enable_server_certificate_verification(false);
  ProxyTest(cli, true);
}

TEST(ProxyTest, NoSSLDigest) {
  Client cli("httpbin");
  ProxyTest(cli, false);
}

TEST(ProxyTest, SSLDigest) {
  SSLClient cli("httpbin");
  cli.enable_server_certificate_verification(false);
  ProxyTest(cli, false);
}
#endif

// ----------------------------------------------------------------------------

template <typename T>
void RedirectProxyText(T &cli, const char *path, bool basic) {
  cli.set_proxy("localhost", basic ? 3128 : 3129);
  if (basic) {
    cli.set_proxy_basic_auth("hello", "world");
  } else {
#ifdef CPPHTTPLIB_SSL_ENABLED
    cli.set_proxy_digest_auth("hello", "world");
#endif
  }
  cli.set_follow_location(true);

  auto res = cli.Get(path);
  ASSERT_TRUE(res != nullptr);
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(RedirectTest, HTTPBinNoSSLBasic) {
  Client cli("httpbin");
  RedirectProxyText(cli, "/redirect/2", true);
}

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(RedirectTest, HTTPBinNoSSLDigest) {
  Client cli("httpbin");
  RedirectProxyText(cli, "/redirect/2", false);
}

TEST(RedirectTest, HTTPBinSSLBasic) {
  SSLClient cli("httpbin");
  cli.enable_server_certificate_verification(false);
  RedirectProxyText(cli, "/redirect/2", true);
}

TEST(RedirectTest, HTTPBinSSLDigest) {
  SSLClient cli("httpbin");
  cli.enable_server_certificate_verification(false);
  RedirectProxyText(cli, "/redirect/2", false);
}
#endif

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(RedirectTest, YouTubeNoSSLBasic) {
  Client cli("youtube.com");
  RedirectProxyText(cli, "/", true);
}

TEST(RedirectTest, YouTubeNoSSLDigest) {
  Client cli("youtube.com");
  RedirectProxyText(cli, "/", false);
}

TEST(RedirectTest, YouTubeSSLBasic) {
  SSLClient cli("youtube.com");
  RedirectProxyText(cli, "/", true);
}

TEST(RedirectTest, YouTubeSSLDigest) {
  std::this_thread::sleep_for(std::chrono::seconds(3));
  SSLClient cli("youtube.com");
  RedirectProxyText(cli, "/", false);
}
#endif

// ----------------------------------------------------------------------------

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(RedirectTest, TLSVerificationOnProxyRedirect) {
  // Untrusted HTTPS server with self-signed cert
  SSLServer untrusted_svr("cert.pem", "key.pem");
  untrusted_svr.Get("/", [](const Request &, Response &res) {
    res.set_content("MITM'd", "text/plain");
  });

  auto untrusted_port = untrusted_svr.bind_to_any_port("0.0.0.0");
  auto t1 = thread([&]() { untrusted_svr.listen_after_bind(); });
  auto se1 = detail::scope_exit([&] {
    untrusted_svr.stop();
    t1.join();
  });

  // HTTP server that redirects to the untrusted HTTPS server
  // Use host.docker.internal so the proxy container can reach the host
  Server redirect_svr;
  redirect_svr.Get("/", [&](const Request &, Response &res) {
    res.set_redirect(
        "https://host.docker.internal:" + to_string(untrusted_port) + "/");
  });

  auto redirect_port = redirect_svr.bind_to_any_port("0.0.0.0");
  auto t2 = thread([&]() { redirect_svr.listen_after_bind(); });
  auto se2 = detail::scope_exit([&] {
    redirect_svr.stop();
    t2.join();
  });

  // Wait until servers are up
  untrusted_svr.wait_until_ready();
  redirect_svr.wait_until_ready();

  // Client with proxy + follow_location, verification ON (default)
  Client cli("host.docker.internal", redirect_port);
  cli.set_proxy("localhost", 3128);
  cli.set_proxy_basic_auth("hello", "world");
  cli.set_follow_location(true);

  auto res = cli.Get("/");

  // Self-signed cert must be rejected
  ASSERT_TRUE(res == nullptr);
}
#endif

// ----------------------------------------------------------------------------

template <typename T> void BaseAuthTestFromHTTPWatch(T &cli) {
  cli.set_proxy("localhost", 3128);
  cli.set_proxy_basic_auth("hello", "world");

  {
    auto res = cli.Get("/basic-auth/hello/world");
    ASSERT_TRUE(res != nullptr);
    EXPECT_EQ(StatusCode::Unauthorized_401, res->status);
  }

  {
    auto res =
        cli.Get("/basic-auth/hello/world",
                Headers{make_basic_authentication_header("hello", "world")});
    ASSERT_TRUE(res != nullptr);
    EXPECT_EQ(normalizeJson("{\"authenticated\":true,\"user\":\"hello\","
                            "\"authorized\":true}\n"),
              normalizeJson(res->body));
    EXPECT_EQ(StatusCode::OK_200, res->status);
  }

  {
    cli.set_basic_auth("hello", "world");
    auto res = cli.Get("/basic-auth/hello/world");
    ASSERT_TRUE(res != nullptr);
    EXPECT_EQ(normalizeJson("{\"authenticated\":true,\"user\":\"hello\","
                            "\"authorized\":true}\n"),
              normalizeJson(res->body));
    EXPECT_EQ(StatusCode::OK_200, res->status);
  }

  {
    cli.set_basic_auth("hello", "bad");
    auto res = cli.Get("/basic-auth/hello/world");
    ASSERT_TRUE(res != nullptr);
    EXPECT_EQ(StatusCode::Unauthorized_401, res->status);
  }

  {
    cli.set_basic_auth("bad", "world");
    auto res = cli.Get("/basic-auth/hello/world");
    ASSERT_TRUE(res != nullptr);
    EXPECT_EQ(StatusCode::Unauthorized_401, res->status);
  }
}

TEST(BaseAuthTest, NoSSL) {
  Client cli("httpbin");
  BaseAuthTestFromHTTPWatch(cli);
}

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(BaseAuthTest, SSL) {
  SSLClient cli("httpbin");
  cli.enable_server_certificate_verification(false);
  BaseAuthTestFromHTTPWatch(cli);
}
#endif

// ----------------------------------------------------------------------------

#ifdef CPPHTTPLIB_SSL_ENABLED
template <typename T> void DigestAuthTestFromHTTPWatch(T &cli) {
  cli.set_proxy("localhost", 3129);
  cli.set_proxy_digest_auth("hello", "world");

  {
    auto res = cli.Get("/digest-auth/auth/hello/world");
    ASSERT_TRUE(res != nullptr);
    EXPECT_EQ(StatusCode::Unauthorized_401, res->status);
  }

  {
    // go-httpbin (the "httpbin" test double) only implements MD5 and
    // SHA-256 for digest auth, so SHA-256 is as far as this can exercise
    // the client's digest-auth algorithm selection end-to-end.
    std::vector<std::string> paths = {
        "/digest-auth/auth/hello/world/MD5",
        "/digest-auth/auth/hello/world/SHA-256",
    };

    cli.set_digest_auth("hello", "world");
    for (auto path : paths) {
      auto res = cli.Get(path.c_str());
      ASSERT_TRUE(res != nullptr);
      EXPECT_EQ(normalizeJson("{\"authenticated\":true,\"user\":\"hello\","
                              "\"authorized\":true}\n"),
                normalizeJson(res->body));
      EXPECT_EQ(StatusCode::OK_200, res->status);
    }

    cli.set_digest_auth("hello", "bad");
    for (auto path : paths) {
      auto res = cli.Get(path.c_str());
      ASSERT_TRUE(res != nullptr);
      EXPECT_EQ(StatusCode::Unauthorized_401, res->status);
    }

    cli.set_digest_auth("bad", "world");
    for (auto path : paths) {
      auto res = cli.Get(path.c_str());
      ASSERT_TRUE(res != nullptr);
      EXPECT_EQ(StatusCode::Unauthorized_401, res->status);
    }
  }
}

TEST(DigestAuthTest, SSL) {
  SSLClient cli("httpbin");
  cli.enable_server_certificate_verification(false);
  DigestAuthTestFromHTTPWatch(cli);
}

TEST(DigestAuthTest, NoSSL) {
  Client cli("httpbin");
  DigestAuthTestFromHTTPWatch(cli);
}
#endif

// ----------------------------------------------------------------------------

template <typename T> void KeepAliveTest(T &cli, bool basic) {
  cli.set_proxy("localhost", basic ? 3128 : 3129);
  if (basic) {
    cli.set_proxy_basic_auth("hello", "world");
  } else {
#ifdef CPPHTTPLIB_SSL_ENABLED
    cli.set_proxy_digest_auth("hello", "world");
#endif
  }

  cli.set_follow_location(true);
#ifdef CPPHTTPLIB_SSL_ENABLED
  cli.set_digest_auth("hello", "world");
#endif

  {
    auto res = cli.Get("/get");
    ASSERT_TRUE(res != nullptr);
    EXPECT_EQ(StatusCode::OK_200, res->status);
  }
  {
    auto res = cli.Get("/redirect/2");
    ASSERT_TRUE(res != nullptr);
    EXPECT_EQ(StatusCode::OK_200, res->status);
  }

  {
    std::vector<std::string> paths = {
        "/digest-auth/auth/hello/world/MD5",
        "/digest-auth/auth/hello/world/SHA-256",
    };

    for (auto path : paths) {
      auto res = cli.Get(path.c_str());
      ASSERT_TRUE(res != nullptr);
      auto body = normalizeJson(res->body);
      EXPECT_TRUE(body.find("\"authenticated\":true") != std::string::npos);
      EXPECT_TRUE(body.find("\"user\":\"hello\"") != std::string::npos);
      EXPECT_EQ(StatusCode::OK_200, res->status);
    }
  }

  {
    int count = 10;
    while (count--) {
      auto res = cli.Get("/get");
      ASSERT_TRUE(res != nullptr);
      EXPECT_EQ(StatusCode::OK_200, res->status);
    }
  }
}

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(KeepAliveTest, NoSSLWithBasic) {
  Client cli("httpbin");
  KeepAliveTest(cli, true);
}

TEST(KeepAliveTest, SSLWithBasic) {
  SSLClient cli("httpbin");
  cli.enable_server_certificate_verification(false);
  KeepAliveTest(cli, true);
}

TEST(KeepAliveTest, NoSSLWithDigest) {
  Client cli("httpbin");
  KeepAliveTest(cli, false);
}

TEST(KeepAliveTest, SSLWithDigest) {
  SSLClient cli("httpbin");
  cli.enable_server_certificate_verification(false);
  KeepAliveTest(cli, false);
}
#endif

// ----------------------------------------------------------------------------

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(ProxyTest, SSLOpenStream) {
  SSLClient cli("httpbin");
  cli.enable_server_certificate_verification(false);
  cli.set_proxy("localhost", 3128);
  cli.set_proxy_basic_auth("hello", "world");

  auto handle = cli.open_stream("GET", "/get");
  ASSERT_TRUE(handle.response);
  EXPECT_EQ(StatusCode::OK_200, handle.response->status);

  std::string body;
  char buf[8192];
  ssize_t n;
  while ((n = handle.read(buf, sizeof(buf))) > 0) {
    body.append(buf, static_cast<size_t>(n));
  }
  EXPECT_FALSE(body.empty());
}
#endif