// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.

package utils

import (
	"context"
	"fmt"
	"io/ioutil"
	"net"
	"net/http"
	"net/http/httptest"
	"net/url"
	"testing"
)

func TestHttpClient(t *testing.T) {
	for _, allowInternal := range []bool{true, false} {
		c := HttpClient(allowInternal)
		for _, tc := range []struct {
			URL        string
			IsInternal bool
		}{
			{
				URL:        "https://google.com",
				IsInternal: false,
			},
			{
				URL:        "https://127.0.0.1",
				IsInternal: true,
			},
		} {
			_, err := c.Get(tc.URL)
			if !tc.IsInternal {
				if err != nil {
					t.Fatal("google is down?")
				}
			} else {
				allowed := !tc.IsInternal || allowInternal
				success := err == nil
				switch e := err.(type) {
				case *net.OpError:
					success = e.Err != AddressForbidden
				case *url.Error:
					success = e.Err != AddressForbidden
				}
				if success != allowed {
					t.Fatalf("failed for %v. allowed: %v, success %v", tc.URL, allowed, success)
				}
			}
		}
	}
}

func TestHttpClientWithProxy(t *testing.T) {
	proxy := createProxyServer()
	defer proxy.Close()

	c := createHttpClient(true, nil, nil)
	purl, _ := url.Parse(proxy.URL)
	c.Transport.(*http.Transport).Proxy = http.ProxyURL(purl)

	resp, err := c.Get("http://acme.com")
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()

	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		t.Fatal(err)
	}
	if string(body) != "proxy" {
		t.FailNow()
	}
}

func createProxyServer() *httptest.Server {
	return httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(200)
		w.Header().Set("Content-Type", "text/plain; charset=us-ascii")
		fmt.Fprint(w, "proxy")
	}))
}

func TestDialContextFilter(t *testing.T) {
	for _, tc := range []struct {
		Addr    string
		IsValid bool
	}{
		{
			Addr:    "google.com:80",
			IsValid: true,
		},
		{
			Addr:    "8.8.8.8:53",
			IsValid: true,
		},
		{
			Addr: "127.0.0.1:80",
		},
		{
			Addr:    "10.0.0.1:80",
			IsValid: true,
		},
	} {
		didDial := false
		filter := dialContextFilter(func(ctx context.Context, network, addr string) (net.Conn, error) {
			didDial = true
			return nil, nil
		}, func(host string) bool { return host == "10.0.0.1" }, func(ip net.IP) bool { return !isReserved(ip) })
		_, err := filter(context.Background(), "", tc.Addr)
		switch {
		case tc.IsValid == (err == AddressForbidden) || (err != nil && err != AddressForbidden):
			t.Errorf("unexpected err for %v (%v)", tc.Addr, err)
		case tc.IsValid != didDial:
			t.Errorf("unexpected didDial for %v", tc.Addr)
		}
	}
}