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cookie.go
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cookie.go
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// Copyright 2016 Google Inc. All rights reserved.
//
// 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.
// cookie parses curl cookie jar files.
package cookie
import (
"bufio"
"fmt"
"io"
"log"
"net/http"
"net/http/cookiejar"
"net/url"
"os"
"path/filepath"
"strconv"
"strings"
"time"
"github.com/fsnotify/fsnotify"
)
// ParseCookieJar parses a cURL/Mozilla/Netscape cookie jar text file.
func ParseCookieJar(r io.Reader) ([]*http.Cookie, error) {
var result []*http.Cookie
scanner := bufio.NewScanner(r)
for scanner.Scan() {
line := scanner.Text()
httpOnly := false
const httpOnlyPrefix = "#HttpOnly_"
if strings.HasPrefix(line, httpOnlyPrefix) {
line = line[len(httpOnlyPrefix):]
httpOnly = true
}
if strings.HasPrefix(line, "#") {
continue
}
line = strings.TrimSpace(line)
if line == "" {
continue
}
fields := strings.Split(line, "\t")
if len(fields) != 6 && len(fields) != 7 {
return nil, fmt.Errorf("got %d fields in line %q, want 6 or 7", len(fields), line)
}
exp, err := strconv.ParseInt(fields[4], 10, 64)
if err != nil {
return nil, err
}
c := http.Cookie{
Domain: strings.TrimSpace(fields[0]),
Name: strings.TrimSpace(fields[5]),
Path: strings.TrimSpace(fields[2]),
Expires: time.Unix(exp, 0),
Secure: fields[3] == "TRUE",
HttpOnly: httpOnly,
}
if len(fields) == 7 {
c.Value = strings.TrimSpace(fields[6])
}
result = append(result, &c)
}
return result, nil
}
// WatchJar starts watching the given path for changes, and loads new
// data from the file whenever it is available.
func WatchJar(jar http.CookieJar, path string) error {
w, err := fsnotify.NewWatcher()
if err != nil {
return err
}
// We watch the dir, so we catch creation + rename events too.
if err := w.Add(filepath.Dir(path)); err != nil {
return err
}
go func() {
var lastMod time.Time
for {
select {
case <-w.Events:
fi, err := os.Stat(path)
if os.IsNotExist(err) {
continue
}
if err != nil {
log.Printf("Stat(%s): %v", path, err)
continue
}
if fi.ModTime().Equal(lastMod) {
continue
}
lastMod = fi.ModTime()
if err := updateJar(jar, path); err != nil {
log.Printf("updateJar(%s): %v", path, err)
}
case <-w.Errors:
log.Printf("notify (%s): %v", path, err)
}
}
}()
return nil
}
// updateJar reads the path into the jar.
func updateJar(jar http.CookieJar, path string) error {
f, err := os.Open(path)
if err != nil {
return err
}
defer f.Close()
cs, err := ParseCookieJar(f)
if err != nil {
return err
}
for _, c := range cs {
jar.SetCookies(&url.URL{
Scheme: "http",
Host: c.Domain,
}, []*http.Cookie{c})
}
return nil
}
// NewJar reads cookies in the Mozilla/Netscape cookie file format,
// and returns them as a CookieJar
func NewJar(path string) (http.CookieJar, error) {
jar, err := cookiejar.New(nil)
if err != nil {
return nil, err
}
if err := updateJar(jar, path); err != nil {
return nil, err
}
return jar, nil
}