package nghttp2

import (
	"bufio"
	"bytes"
	"fmt"
	"github.com/bradfitz/http2/hpack"
	"golang.org/x/net/websocket"
	"io"
	"net/http"
	"syscall"
	"testing"
)

// TestH1H1PlainGET tests whether simple HTTP/1 GET request works.
func TestH1H1PlainGET(t *testing.T) {
	st := newServerTester(nil, t, noopHandler)
	defer st.Close()

	res, err := st.http1(requestParam{
		name: "TestH1H1PlainGET",
	})
	if err != nil {
		t.Fatalf("Error st.http1() = %v", err)
	}

	want := 200
	if got := res.status; got != want {
		t.Errorf("status = %v; want %v", got, want)
	}
}

// TestH1H1PlainGETClose tests whether simple HTTP/1 GET request with
// Connetion: close request header field works.
func TestH1H1PlainGETClose(t *testing.T) {
	st := newServerTester(nil, t, noopHandler)
	defer st.Close()

	res, err := st.http1(requestParam{
		name: "TestH1H1PlainGETClose",
		header: []hpack.HeaderField{
			pair("Connection", "close"),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http1() = %v", err)
	}

	want := 200
	if got := res.status; got != want {
		t.Errorf("status = %v; want %v", got, want)
	}
}

// TestH1H1InvalidMethod tests that server rejects invalid method with
// 501 status code
func TestH1H1InvalidMethod(t *testing.T) {
	st := newServerTester(nil, t, func(w http.ResponseWriter, r *http.Request) {
		t.Errorf("server should not forward this request")
	})
	defer st.Close()

	res, err := st.http1(requestParam{
		name:   "TestH1H1InvalidMethod",
		method: "get",
	})
	if err != nil {
		t.Fatalf("Error st.http1() = %v", err)
	}

	if got, want := res.status, 501; got != want {
		t.Errorf("status = %v; want %v", got, want)
	}
}

// TestH1H1MultipleRequestCL tests that server rejects request which
// contains multiple Content-Length header fields.
func TestH1H1MultipleRequestCL(t *testing.T) {
	st := newServerTester(nil, t, func(w http.ResponseWriter, r *http.Request) {
		t.Errorf("server should not forward bad request")
	})
	defer st.Close()

	if _, err := io.WriteString(st.conn, fmt.Sprintf(`GET / HTTP/1.1
Host: %v
Test-Case: TestH1H1MultipleRequestCL
Content-Length: 0
Content-Length: 0

`, st.authority)); err != nil {
		t.Fatalf("Error io.WriteString() = %v", err)
	}

	resp, err := http.ReadResponse(bufio.NewReader(st.conn), nil)
	if err != nil {
		t.Fatalf("Error http.ReadResponse() = %v", err)
	}

	want := 400
	if got := resp.StatusCode; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
}

// TestH1H1ConnectFailure tests that server handles the situation that
// connection attempt to HTTP/1 backend failed.
func TestH1H1ConnectFailure(t *testing.T) {
	st := newServerTester(nil, t, noopHandler)
	defer st.Close()

	// shutdown backend server to simulate backend connect failure
	st.ts.Close()

	res, err := st.http1(requestParam{
		name: "TestH1H1ConnectFailure",
	})
	if err != nil {
		t.Fatalf("Error st.http1() = %v", err)
	}
	want := 503
	if got := res.status; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
}

// TestH1H1GracefulShutdown tests graceful shutdown.
func TestH1H1GracefulShutdown(t *testing.T) {
	st := newServerTester(nil, t, noopHandler)
	defer st.Close()

	res, err := st.http1(requestParam{
		name: "TestH1H1GracefulShutdown-1",
	})
	if err != nil {
		t.Fatalf("Error st.http1() = %v", err)
	}

	if got, want := res.status, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}

	st.cmd.Process.Signal(syscall.SIGQUIT)

	res, err = st.http1(requestParam{
		name: "TestH1H1GracefulShutdown-2",
	})
	if err != nil {
		t.Fatalf("Error st.http1() = %v", err)
	}

	if got, want := res.status, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}

	if got, want := res.connClose, true; got != want {
		t.Errorf("res.connClose: %v; want %v", got, want)
	}

	want := io.EOF
	if _, err := st.conn.Read(nil); err == nil || err != want {
		t.Errorf("st.conn.Read(): %v; want %v", err, want)
	}
}

// TestH1H1HostRewrite tests that server rewrites Host header field
func TestH1H1HostRewrite(t *testing.T) {
	st := newServerTester(nil, t, func(w http.ResponseWriter, r *http.Request) {
		w.Header().Add("request-host", r.Host)
	})
	defer st.Close()

	res, err := st.http1(requestParam{
		name: "TestH1H1HostRewrite",
	})
	if err != nil {
		t.Fatalf("Error st.http1() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
	if got, want := res.header.Get("request-host"), st.backendHost; got != want {
		t.Errorf("request-host: %v; want %v", got, want)
	}
}

// TestH1H1HTTP10 tests that server can accept HTTP/1.0 request
// without Host header field
func TestH1H1HTTP10(t *testing.T) {
	st := newServerTester(nil, t, func(w http.ResponseWriter, r *http.Request) {
		w.Header().Add("request-host", r.Host)
	})
	defer st.Close()

	if _, err := io.WriteString(st.conn, "GET / HTTP/1.0\r\nTest-Case: TestH1H1HTTP10\r\n\r\n"); err != nil {
		t.Fatalf("Error io.WriteString() = %v", err)
	}

	resp, err := http.ReadResponse(bufio.NewReader(st.conn), nil)
	if err != nil {
		t.Fatalf("Error http.ReadResponse() = %v", err)
	}

	if got, want := resp.StatusCode, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
	if got, want := resp.Header.Get("request-host"), st.backendHost; got != want {
		t.Errorf("request-host: %v; want %v", got, want)
	}
}

// TestH1H1HTTP10NoHostRewrite tests that server generates host header
// field using actual backend server even if --no-http-rewrite is
// used.
func TestH1H1HTTP10NoHostRewrite(t *testing.T) {
	st := newServerTester([]string{"--no-host-rewrite"}, t, func(w http.ResponseWriter, r *http.Request) {
		w.Header().Add("request-host", r.Host)
	})
	defer st.Close()

	if _, err := io.WriteString(st.conn, "GET / HTTP/1.0\r\nTest-Case: TestH1H1HTTP10NoHostRewrite\r\n\r\n"); err != nil {
		t.Fatalf("Error io.WriteString() = %v", err)
	}

	resp, err := http.ReadResponse(bufio.NewReader(st.conn), nil)
	if err != nil {
		t.Fatalf("Error http.ReadResponse() = %v", err)
	}

	if got, want := resp.StatusCode, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
	if got, want := resp.Header.Get("request-host"), st.backendHost; got != want {
		t.Errorf("request-host: %v; want %v", got, want)
	}
}

// TestH1H1RequestTrailer tests request trailer part is forwarded to
// backend.
func TestH1H1RequestTrailer(t *testing.T) {
	st := newServerTester(nil, t, func(w http.ResponseWriter, r *http.Request) {
		buf := make([]byte, 4096)
		for {
			_, err := r.Body.Read(buf)
			if err == io.EOF {
				break
			}
			if err != nil {
				t.Fatalf("r.Body.Read() = %v", err)
			}
		}
		if got, want := r.Trailer.Get("foo"), "bar"; got != want {
			t.Errorf("r.Trailer.Get(foo): %v; want %v", got, want)
		}
	})
	defer st.Close()

	res, err := st.http1(requestParam{
		name: "TestH1H1RequestTrailer",
		body: []byte("1"),
		trailer: []hpack.HeaderField{
			pair("foo", "bar"),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http1() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("res.status: %v; want %v", got, want)
	}
}

// TestH1H1HeaderFieldBufferPath tests that request with request path
// larger than configured buffer size is rejected.
func TestH1H1HeaderFieldBufferPath(t *testing.T) {
	// The value 100 is chosen so that sum of header fields bytes
	// does not exceed it.  We use > 100 bytes URI to exceed this
	// limit.
	st := newServerTester([]string{"--header-field-buffer=100"}, t, func(w http.ResponseWriter, r *http.Request) {
		t.Fatal("execution path should not be here")
	})
	defer st.Close()

	res, err := st.http1(requestParam{
		name: "TestH1H1HeaderFieldBufferPath",
		path: "/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb",
	})
	if err != nil {
		t.Fatalf("Error st.http1() = %v", err)
	}
	if got, want := res.status, 431; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
}

// TestH1H1HeaderFieldBuffer tests that request with header fields
// larger than configured buffer size is rejected.
func TestH1H1HeaderFieldBuffer(t *testing.T) {
	st := newServerTester([]string{"--header-field-buffer=10"}, t, func(w http.ResponseWriter, r *http.Request) {
		t.Fatal("execution path should not be here")
	})
	defer st.Close()

	res, err := st.http1(requestParam{
		name: "TestH1H1HeaderFieldBuffer",
	})
	if err != nil {
		t.Fatalf("Error st.http1() = %v", err)
	}
	if got, want := res.status, 431; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
}

// TestH1H1HeaderFields tests that request with header fields more
// than configured number is rejected.
func TestH1H1HeaderFields(t *testing.T) {
	st := newServerTester([]string{"--max-header-fields=1"}, t, func(w http.ResponseWriter, r *http.Request) {
		t.Fatal("execution path should not be here")
	})
	defer st.Close()

	res, err := st.http1(requestParam{
		name: "TestH1H1HeaderFields",
		header: []hpack.HeaderField{
			// Add extra header field to ensure that
			// header field limit exceeds
			pair("Connection", "close"),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http1() = %v", err)
	}
	if got, want := res.status, 431; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
}

// TestH1H1Websocket tests that HTTP Upgrade to WebSocket works.
func TestH1H1Websocket(t *testing.T) {
	st := newServerTesterHandler(nil, t, websocket.Handler(func(ws *websocket.Conn) {
		io.Copy(ws, ws)
	}))
	defer st.Close()

	content := []byte("hello world")
	res, err := st.websocket(requestParam{
		name: "TestH1H1Websocket",
		body: content,
	})
	if err != nil {
		t.Fatalf("Error st.websocket() = %v", err)
	}
	if got, want := res.body, content; !bytes.Equal(got, want) {
		t.Errorf("echo: %q; want %q", got, want)
	}
}

// TestH1H2ConnectFailure tests that server handles the situation that
// connection attempt to HTTP/2 backend failed.
func TestH1H2ConnectFailure(t *testing.T) {
	st := newServerTester([]string{"--http2-bridge"}, t, noopHandler)
	defer st.Close()

	// simulate backend connect attempt failure
	st.ts.Close()

	res, err := st.http1(requestParam{
		name: "TestH1H2ConnectFailure",
	})
	if err != nil {
		t.Fatalf("Error st.http1() = %v", err)
	}
	want := 503
	if got := res.status; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
}

// TestH1H2NoHost tests that server rejects request without Host
// header field for HTTP/2 backend.
func TestH1H2NoHost(t *testing.T) {
	st := newServerTester([]string{"--http2-bridge"}, t, func(w http.ResponseWriter, r *http.Request) {
		t.Errorf("server should not forward bad request")
	})
	defer st.Close()

	// without Host header field, we expect 400 response
	if _, err := io.WriteString(st.conn, "GET / HTTP/1.1\r\nTest-Case: TestH1H2NoHost\r\n\r\n"); err != nil {
		t.Fatalf("Error io.WriteString() = %v", err)
	}

	resp, err := http.ReadResponse(bufio.NewReader(st.conn), nil)
	if err != nil {
		t.Fatalf("Error http.ReadResponse() = %v", err)
	}

	want := 400
	if got := resp.StatusCode; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
}

// TestH1H2HTTP10 tests that server can accept HTTP/1.0 request
// without Host header field
func TestH1H2HTTP10(t *testing.T) {
	st := newServerTester([]string{"--http2-bridge"}, t, func(w http.ResponseWriter, r *http.Request) {
		w.Header().Add("request-host", r.Host)
	})
	defer st.Close()

	if _, err := io.WriteString(st.conn, "GET / HTTP/1.0\r\nTest-Case: TestH1H2HTTP10\r\n\r\n"); err != nil {
		t.Fatalf("Error io.WriteString() = %v", err)
	}

	resp, err := http.ReadResponse(bufio.NewReader(st.conn), nil)
	if err != nil {
		t.Fatalf("Error http.ReadResponse() = %v", err)
	}

	if got, want := resp.StatusCode, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
	if got, want := resp.Header.Get("request-host"), st.backendHost; got != want {
		t.Errorf("request-host: %v; want %v", got, want)
	}
}

// TestH1H2HTTP10NoHostRewrite tests that server generates host header
// field using actual backend server even if --no-http-rewrite is
// used.
func TestH1H2HTTP10NoHostRewrite(t *testing.T) {
	st := newServerTester([]string{"--http2-bridge", "--no-host-rewrite"}, t, func(w http.ResponseWriter, r *http.Request) {
		w.Header().Add("request-host", r.Host)
	})
	defer st.Close()

	if _, err := io.WriteString(st.conn, "GET / HTTP/1.0\r\nTest-Case: TestH1H2HTTP10NoHostRewrite\r\n\r\n"); err != nil {
		t.Fatalf("Error io.WriteString() = %v", err)
	}

	resp, err := http.ReadResponse(bufio.NewReader(st.conn), nil)
	if err != nil {
		t.Fatalf("Error http.ReadResponse() = %v", err)
	}

	if got, want := resp.StatusCode, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
	if got, want := resp.Header.Get("request-host"), st.backendHost; got != want {
		t.Errorf("request-host: %v; want %v", got, want)
	}
}

// TestH1H2CrumbleCookie tests that Cookies are crumbled and assembled
// when forwarding to HTTP/2 backend link.  go-nghttp2 server
// concatenates crumbled Cookies automatically, so this test is not
// much effective now.
func TestH1H2CrumbleCookie(t *testing.T) {
	st := newServerTester([]string{"--http2-bridge"}, t, func(w http.ResponseWriter, r *http.Request) {
		if got, want := r.Header.Get("Cookie"), "alpha; bravo; charlie"; got != want {
			t.Errorf("Cookie: %v; want %v", got, want)
		}
	})
	defer st.Close()

	res, err := st.http1(requestParam{
		name: "TestH1H2CrumbleCookie",
		header: []hpack.HeaderField{
			pair("Cookie", "alpha; bravo; charlie"),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http1() = %v", err)
	}
	if got, want := res.status, 200; got != want {
		t.Errorf("status: %v; want %v", got, want)
	}
}

// TestH1H2GenerateVia tests that server generates Via header field to and
// from backend server.
func TestH1H2GenerateVia(t *testing.T) {
	st := newServerTester([]string{"--http2-bridge"}, t, func(w http.ResponseWriter, r *http.Request) {
		if got, want := r.Header.Get("Via"), "1.1 nghttpx"; got != want {
			t.Errorf("Via: %v; want %v", got, want)
		}
	})
	defer st.Close()

	res, err := st.http1(requestParam{
		name: "TestH1H2GenerateVia",
	})
	if err != nil {
		t.Fatalf("Error st.http1() = %v", err)
	}
	if got, want := res.header.Get("Via"), "2 nghttpx"; got != want {
		t.Errorf("Via: %v; want %v", got, want)
	}
}

// TestH1H2AppendVia tests that server adds value to existing Via
// header field to and from backend server.
func TestH1H2AppendVia(t *testing.T) {
	st := newServerTester([]string{"--http2-bridge"}, t, func(w http.ResponseWriter, r *http.Request) {
		if got, want := r.Header.Get("Via"), "foo, 1.1 nghttpx"; got != want {
			t.Errorf("Via: %v; want %v", got, want)
		}
		w.Header().Add("Via", "bar")
	})
	defer st.Close()

	res, err := st.http1(requestParam{
		name: "TestH1H2AppendVia",
		header: []hpack.HeaderField{
			pair("via", "foo"),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http1() = %v", err)
	}
	if got, want := res.header.Get("Via"), "bar, 2 nghttpx"; got != want {
		t.Errorf("Via: %v; want %v", got, want)
	}
}

// TestH1H2NoVia tests that server does not add value to existing Via
// header field to and from backend server.
func TestH1H2NoVia(t *testing.T) {
	st := newServerTester([]string{"--http2-bridge", "--no-via"}, t, func(w http.ResponseWriter, r *http.Request) {
		if got, want := r.Header.Get("Via"), "foo"; got != want {
			t.Errorf("Via: %v; want %v", got, want)
		}
		w.Header().Add("Via", "bar")
	})
	defer st.Close()

	res, err := st.http1(requestParam{
		name: "TestH1H2NoVia",
		header: []hpack.HeaderField{
			pair("via", "foo"),
		},
	})
	if err != nil {
		t.Fatalf("Error st.http1() = %v", err)
	}
	if got, want := res.header.Get("Via"), "bar"; got != want {
		t.Errorf("Via: %v; want %v", got, want)
	}
}