136 lines
3.4 KiB
Go
136 lines
3.4 KiB
Go
// Copyright 2016 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package autocert
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"io/ioutil"
|
|
"os"
|
|
"path/filepath"
|
|
)
|
|
|
|
// ErrCacheMiss is returned when a certificate is not found in cache.
|
|
var ErrCacheMiss = errors.New("acme/autocert: certificate cache miss")
|
|
|
|
// Cache is used by Manager to store and retrieve previously obtained certificates
|
|
// and other account data as opaque blobs.
|
|
//
|
|
// Cache implementations should not rely on the key naming pattern. Keys can
|
|
// include any printable ASCII characters, except the following: \/:*?"<>|
|
|
type Cache interface {
|
|
// Get returns a certificate data for the specified key.
|
|
// If there's no such key, Get returns ErrCacheMiss.
|
|
Get(ctx context.Context, key string) ([]byte, error)
|
|
|
|
// Put stores the data in the cache under the specified key.
|
|
// Underlying implementations may use any data storage format,
|
|
// as long as the reverse operation, Get, results in the original data.
|
|
Put(ctx context.Context, key string, data []byte) error
|
|
|
|
// Delete removes a certificate data from the cache under the specified key.
|
|
// If there's no such key in the cache, Delete returns nil.
|
|
Delete(ctx context.Context, key string) error
|
|
}
|
|
|
|
// DirCache implements Cache using a directory on the local filesystem.
|
|
// If the directory does not exist, it will be created with 0700 permissions.
|
|
type DirCache string
|
|
|
|
// Get reads a certificate data from the specified file name.
|
|
func (d DirCache) Get(ctx context.Context, name string) ([]byte, error) {
|
|
name = filepath.Join(string(d), name)
|
|
var (
|
|
data []byte
|
|
err error
|
|
done = make(chan struct{})
|
|
)
|
|
go func() {
|
|
data, err = ioutil.ReadFile(name)
|
|
close(done)
|
|
}()
|
|
select {
|
|
case <-ctx.Done():
|
|
return nil, ctx.Err()
|
|
case <-done:
|
|
}
|
|
if os.IsNotExist(err) {
|
|
return nil, ErrCacheMiss
|
|
}
|
|
return data, err
|
|
}
|
|
|
|
// Put writes the certificate data to the specified file name.
|
|
// The file will be created with 0600 permissions.
|
|
func (d DirCache) Put(ctx context.Context, name string, data []byte) error {
|
|
if err := os.MkdirAll(string(d), 0700); err != nil {
|
|
return err
|
|
}
|
|
|
|
done := make(chan struct{})
|
|
var err error
|
|
go func() {
|
|
defer close(done)
|
|
var tmp string
|
|
if tmp, err = d.writeTempFile(name, data); err != nil {
|
|
return
|
|
}
|
|
defer os.Remove(tmp)
|
|
select {
|
|
case <-ctx.Done():
|
|
// Don't overwrite the file if the context was canceled.
|
|
default:
|
|
newName := filepath.Join(string(d), name)
|
|
err = os.Rename(tmp, newName)
|
|
}
|
|
}()
|
|
select {
|
|
case <-ctx.Done():
|
|
return ctx.Err()
|
|
case <-done:
|
|
}
|
|
return err
|
|
}
|
|
|
|
// Delete removes the specified file name.
|
|
func (d DirCache) Delete(ctx context.Context, name string) error {
|
|
name = filepath.Join(string(d), name)
|
|
var (
|
|
err error
|
|
done = make(chan struct{})
|
|
)
|
|
go func() {
|
|
err = os.Remove(name)
|
|
close(done)
|
|
}()
|
|
select {
|
|
case <-ctx.Done():
|
|
return ctx.Err()
|
|
case <-done:
|
|
}
|
|
if err != nil && !os.IsNotExist(err) {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// writeTempFile writes b to a temporary file, closes the file and returns its path.
|
|
func (d DirCache) writeTempFile(prefix string, b []byte) (name string, reterr error) {
|
|
// TempFile uses 0600 permissions
|
|
f, err := ioutil.TempFile(string(d), prefix)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
defer func() {
|
|
if reterr != nil {
|
|
os.Remove(f.Name())
|
|
}
|
|
}()
|
|
if _, err := f.Write(b); err != nil {
|
|
f.Close()
|
|
return "", err
|
|
}
|
|
return f.Name(), f.Close()
|
|
}
|