// Copyright 2015 Matthew Holt and The Caddy Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package fileserver

import (
	"context"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"runtime"
	"strings"
	"testing"
	"time"

	"github.com/caddyserver/caddy/v2"
)

func TestFileHidden(t *testing.T) {
	for i, tc := range []struct {
		inputHide []string
		inputPath string
		expect    bool
	}{
		{
			inputHide: nil,
			inputPath: "",
			expect:    false,
		},
		{
			inputHide: []string{".gitignore"},
			inputPath: "/.gitignore",
			expect:    true,
		},
		{
			inputHide: []string{".git"},
			inputPath: "/.gitignore",
			expect:    false,
		},
		{
			inputHide: []string{"/.git"},
			inputPath: "/.gitignore",
			expect:    false,
		},
		{
			inputHide: []string{".git"},
			inputPath: "/.git",
			expect:    true,
		},
		{
			inputHide: []string{".git"},
			inputPath: "/.git/foo",
			expect:    true,
		},
		{
			inputHide: []string{".git"},
			inputPath: "/foo/.git/bar",
			expect:    true,
		},
		{
			inputHide: []string{"/prefix"},
			inputPath: "/prefix/foo",
			expect:    true,
		},
		{
			inputHide: []string{"/foo/*/bar"},
			inputPath: "/foo/asdf/bar",
			expect:    true,
		},
		{
			inputHide: []string{"*.txt"},
			inputPath: "/foo/bar.txt",
			expect:    true,
		},
		{
			inputHide: []string{"/foo/bar/*.txt"},
			inputPath: "/foo/bar/baz.txt",
			expect:    true,
		},
		{
			inputHide: []string{"/foo/bar/*.txt"},
			inputPath: "/foo/bar.txt",
			expect:    false,
		},
		{
			inputHide: []string{"/foo/bar/*.txt"},
			inputPath: "/foo/bar/index.html",
			expect:    false,
		},
		{
			inputHide: []string{"/foo"},
			inputPath: "/foo",
			expect:    true,
		},
		{
			inputHide: []string{"/foo"},
			inputPath: "/foobar",
			expect:    false,
		},
		{
			inputHide: []string{"first", "second"},
			inputPath: "/second",
			expect:    true,
		},
	} {
		if runtime.GOOS == "windows" {
			if strings.HasPrefix(tc.inputPath, "/") {
				tc.inputPath, _ = filepath.Abs(tc.inputPath)
			}
			tc.inputPath = filepath.FromSlash(tc.inputPath)
			for i := range tc.inputHide {
				if strings.HasPrefix(tc.inputHide[i], "/") {
					tc.inputHide[i], _ = filepath.Abs(tc.inputHide[i])
				}
				tc.inputHide[i] = filepath.FromSlash(tc.inputHide[i])
			}
		}

		actual := fileHidden(tc.inputPath, tc.inputHide)
		if actual != tc.expect {
			t.Errorf("Test %d: Does %v hide %s? Got %t but expected %t",
				i, tc.inputHide, tc.inputPath, actual, tc.expect)
		}
	}
}

// Check to make sure that we don't serve ETag and Last-Modified headers
// for files with invalid modification times
func TestModTimeHeaders(t *testing.T) {
	check_validator_headers(time.Now(), true, t)
	check_validator_headers(time.Unix(0, 0), false, t)
	check_validator_headers(time.Unix(1, 0), false, t)
	check_validator_headers(time.Unix(2, 0), true, t)
}

func check_validator_headers(modTime time.Time, expect_headers bool, t *testing.T) {
	f := false
	fsrv := FileServer{
		Root:          "./testdata",
		CanonicalURIs: &f,
	}
	w := httptest.NewRecorder()
	r, err := http.NewRequest("GET", "/modtime.txt", nil)
	if err != nil {
		t.Fatal(err)
	}
	repl := caddy.NewReplacer()
	ctx := context.WithValue(r.Context(), caddy.ReplacerCtxKey, repl)
	r = r.WithContext(ctx)

	ctx2, _ := caddy.NewContext(caddy.Context{Context: context.Background()}) // module will be nil by default
	fsrv.Provision(ctx2)

	path := "testdata/modtime.txt"
	os.Chtimes(path, modTime, modTime)

	fsrv.ServeHTTP(w, r, nil)

	if expect_headers {
		if w.Header().Get("ETag") == "" {
			t.Errorf("Didn't get ETag header for file with valid mod time %s", modTime)
		}
		if w.Header().Get("Last-Modified") == "" {
			t.Errorf("Didn't get Last-Modified header for file with valid mod time %s", modTime)
		}
	} else {
		if w.Header().Get("ETag") != "" {
			t.Errorf("Got ETag header for file with invalid mod time %s", modTime)
		}
		if w.Header().Get("Last-Modified") != "" {
			t.Errorf("Got Last-Modified header for file with invalid mod time %s", modTime)
		}
	}
}