modify session module

change a log

@@ -28,21 +28,21 @@ Then in you web app init the global session manager
 * Use **memory** as provider:
 * Use **memory** as provider:
 
 
 		func init() {
 		func init() {
-			globalSessions, _ = session.NewManager("memory", "gosessionid", 3600,"")
+			globalSessions, _ = session.NewManager("memory", `{"cookieName":"gosessionid","gclifetime":3600}`)
 			go globalSessions.GC()
 			go globalSessions.GC()
 		}
 		}
 
 
 * Use **file** as provider, the last param is the path where you want file to be stored:
 * Use **file** as provider, the last param is the path where you want file to be stored:
 
 
 		func init() {
 		func init() {
-			globalSessions, _ = session.NewManager("file", "gosessionid", 3600, "./tmp")
+			globalSessions, _ = session.NewManager("file",`{"cookieName":"gosessionid","gclifetime":3600,"ProviderConfig","./tmp"}`)
 			go globalSessions.GC()
 			go globalSessions.GC()
 		}
 		}
 
 
 * Use **Redis** as provider, the last param is the Redis conn address,poolsize,password:
 * Use **Redis** as provider, the last param is the Redis conn address,poolsize,password:
 
 
 		func init() {
 		func init() {
-			globalSessions, _ = session.NewManager("redis", "gosessionid", 3600, "127.0.0.1:6379,100,astaxie")
+			globalSessions, _ = session.NewManager("redis", `{"cookieName":"gosessionid","gclifetime":3600,"ProviderConfig","127.0.0.1:6379,100,astaxie"}`)
 			go globalSessions.GC()
 			go globalSessions.GC()
 		}
 		}
 		
 		
@@ -50,15 +50,24 @@ Then in you web app init the global session manager
 
 
 		func init() {
 		func init() {
 			globalSessions, _ = session.NewManager(
 			globalSessions, _ = session.NewManager(
-				"mysql", "gosessionid", 3600, "username:password@protocol(address)/dbname?param=value")
+				"mysql", `{"cookieName":"gosessionid","gclifetime":3600,"ProviderConfig","username:password@protocol(address)/dbname?param=value"}`)
 			go globalSessions.GC()
 			go globalSessions.GC()
 		}
 		}
 
 
+* Use **Cookie** as provider:
+
+		func init() {
+			globalSessions, _ = session.NewManager(
+				"cookie", `{"cookieName":"gosessionid","enableSetCookie":false,gclifetime":3600,"ProviderConfig":"{\"cookieName\":\"gosessionid\",\"securityKey\":\"beegocookiehashkey\"}"}`)
+			go globalSessions.GC()
+		}
+
+
 Finally in the handlerfunc you can use it like this
 Finally in the handlerfunc you can use it like this
 
 
 	func login(w http.ResponseWriter, r *http.Request) {
 	func login(w http.ResponseWriter, r *http.Request) {
 		sess := globalSessions.SessionStart(w, r)
 		sess := globalSessions.SessionStart(w, r)
-		defer sess.SessionRelease()
+		defer sess.SessionRelease(w)
 		username := sess.Get("username")
 		username := sess.Get("username")
 		fmt.Println(username)
 		fmt.Println(username)
 		if r.Method == "GET" {
 		if r.Method == "GET" {
@@ -78,19 +87,19 @@ When you develop a web app, maybe you want to write own provider because you mus
 
 
 Writing a provider is easy. You only need to define two struct types 
 Writing a provider is easy. You only need to define two struct types 
 (Session and Provider), which satisfy the interface definition. 
 (Session and Provider), which satisfy the interface definition. 
-Maybe you will find the **memory** provider as good example.
+Maybe you will find the **memory** provider is a good example.
 
 
 	type SessionStore interface {
 	type SessionStore interface {
-		Set(key, value interface{}) error //set session value
-		Get(key interface{}) interface{}  //get session value
-		Delete(key interface{}) error     //delete session value
-		SessionID() string                //back current sessionID
-		SessionRelease()                  // release the resource & save data to provider
-		Flush() error                     //delete all data
+		Set(key, value interface{}) error     //set session value
+		Get(key interface{}) interface{}      //get session value
+		Delete(key interface{}) error         //delete session value
+		SessionID() string                    //back current sessionID
+		SessionRelease(w http.ResponseWriter) // release the resource & save data to provider & return the data
+		Flush() error                         //delete all data
 	}
 	}
 	
 	
 	type Provider interface {
 	type Provider interface {
-		SessionInit(maxlifetime int64, savePath string) error
+		SessionInit(gclifetime int64, config string) error
 		SessionRead(sid string) (SessionStore, error)
 		SessionRead(sid string) (SessionStore, error)
 		SessionExist(sid string) bool
 		SessionExist(sid string) bool
 		SessionRegenerate(oldsid, sid string) (SessionStore, error)
 		SessionRegenerate(oldsid, sid string) (SessionStore, error)

+package session
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"encoding/json"
+	"net/http"
+	"net/url"
+	"sync"
+)
+
+var cookiepder = &CookieProvider{}
+
+type CookieSessionStore struct {
+	sid    string
+	values map[interface{}]interface{} //session data
+	lock   sync.RWMutex
+}
+
+func (st *CookieSessionStore) Set(key, value interface{}) error {
+	st.lock.Lock()
+	defer st.lock.Unlock()
+	st.values[key] = value
+	return nil
+}
+
+func (st *CookieSessionStore) Get(key interface{}) interface{} {
+	st.lock.RLock()
+	defer st.lock.RUnlock()
+	if v, ok := st.values[key]; ok {
+		return v
+	} else {
+		return nil
+	}
+	return nil
+}
+
+func (st *CookieSessionStore) Delete(key interface{}) error {
+	st.lock.Lock()
+	defer st.lock.Unlock()
+	delete(st.values, key)
+	return nil
+}
+
+func (st *CookieSessionStore) Flush() error {
+	st.lock.Lock()
+	defer st.lock.Unlock()
+	st.values = make(map[interface{}]interface{})
+	return nil
+}
+
+func (st *CookieSessionStore) SessionID() string {
+	return st.sid
+}
+
+func (st *CookieSessionStore) SessionRelease(w http.ResponseWriter) {
+	str, err := encodeCookie(cookiepder.block,
+		cookiepder.config.SecurityKey,
+		cookiepder.config.SecurityName,
+		st.values)
+	if err != nil {
+		return
+	}
+	cookie := &http.Cookie{Name: cookiepder.config.CookieName,
+		Value:    url.QueryEscape(str),
+		Path:     "/",
+		HttpOnly: true,
+		Secure:   cookiepder.config.Secure}
+	http.SetCookie(w, cookie)
+	return
+}
+
+type cookieConfig struct {
+	SecurityKey  string `json:"securityKey"`
+	BlockKey     string `json:"blockKey"`
+	SecurityName string `json:"securityName"`
+	CookieName   string `json:"cookieName"`
+	Secure       bool   `json:"secure"`
+	Maxage       int    `json:"maxage"`
+}
+
+type CookieProvider struct {
+	maxlifetime int64
+	config      *cookieConfig
+	block       cipher.Block
+}
+
+func (pder *CookieProvider) SessionInit(maxlifetime int64, config string) error {
+	pder.config = &cookieConfig{}
+	err := json.Unmarshal([]byte(config), pder.config)
+	if err != nil {
+		return err
+	}
+	if pder.config.BlockKey == "" {
+		pder.config.BlockKey = string(generateRandomKey(16))
+	}
+	if pder.config.SecurityName == "" {
+		pder.config.SecurityName = string(generateRandomKey(20))
+	}
+	pder.block, err = aes.NewCipher([]byte(pder.config.BlockKey))
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (pder *CookieProvider) SessionRead(sid string) (SessionStore, error) {
+	kv := make(map[interface{}]interface{})
+	kv, _ = decodeCookie(pder.block,
+		pder.config.SecurityKey,
+		pder.config.SecurityName,
+		sid, pder.maxlifetime)
+	rs := &CookieSessionStore{sid: sid, values: kv}
+	return rs, nil
+}
+
+func (pder *CookieProvider) SessionExist(sid string) bool {
+	return true
+}
+
+func (pder *CookieProvider) SessionRegenerate(oldsid, sid string) (SessionStore, error) {
+	return nil, nil
+}
+
+func (pder *CookieProvider) SessionDestroy(sid string) error {
+	return nil
+}
+
+func (pder *CookieProvider) SessionGC() {
+	return
+}
+
+func (pder *CookieProvider) SessionAll() int {
+	return 0
+}
+
+func (pder *CookieProvider) SessionUpdate(sid string) error {
+	return nil
+}
+
+func init() {
+	Register("cookie", cookiepder)
+}

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"fmt"
 	"io"
 	"io"
 	"io/ioutil"
 	"io/ioutil"
+	"net/http"
 	"os"
 	"os"
 	"path"
 	"path"
 	"path/filepath"
 	"path/filepath"
@@ -60,7 +61,7 @@ func (fs *FileSessionStore) SessionID() string {
 	return fs.sid
 	return fs.sid
 }
 }
 
 
-func (fs *FileSessionStore) SessionRelease() {
+func (fs *FileSessionStore) SessionRelease(w http.ResponseWriter) {
 	defer fs.f.Close()
 	defer fs.f.Close()
 	b, err := encodeGob(fs.values)
 	b, err := encodeGob(fs.values)
 	if err != nil {
 	if err != nil {

-package session
-
-import (
-	"bytes"
-	"encoding/gob"
-)
-
-func init() {
-	gob.Register([]interface{}{})
-	gob.Register(map[int]interface{}{})
-	gob.Register(map[string]interface{}{})
-	gob.Register(map[interface{}]interface{}{})
-	gob.Register(map[string]string{})
-	gob.Register(map[int]string{})
-	gob.Register(map[int]int{})
-	gob.Register(map[int]int64{})
-}
-
-func encodeGob(obj map[interface{}]interface{}) ([]byte, error) {
-	buf := bytes.NewBuffer(nil)
-	enc := gob.NewEncoder(buf)
-	err := enc.Encode(obj)
-	if err != nil {
-		return []byte(""), err
-	}
-	return buf.Bytes(), nil
-}
-
-func decodeGob(encoded []byte) (map[interface{}]interface{}, error) {
-	buf := bytes.NewBuffer(encoded)
-	dec := gob.NewDecoder(buf)
-	var out map[interface{}]interface{}
-	err := dec.Decode(&out)
-	if err != nil {
-		return nil, err
-	}
-	return out, nil
-}

@@ -2,6 +2,7 @@ package session
 
 
 import (
 import (
 	"container/list"
 	"container/list"
+	"net/http"
 	"sync"
 	"sync"
 	"time"
 	"time"
 )
 )
@@ -9,9 +10,9 @@ import (
 var mempder = &MemProvider{list: list.New(), sessions: make(map[string]*list.Element)}
 var mempder = &MemProvider{list: list.New(), sessions: make(map[string]*list.Element)}
 
 
 type MemSessionStore struct {
 type MemSessionStore struct {
-	sid          string                      //session id唯一标示
-	timeAccessed time.Time                   //最后访问时间
-	value        map[interface{}]interface{} //session里面存储的值
+	sid          string                      //session id
+	timeAccessed time.Time                   //last access time
+	value        map[interface{}]interface{} //session store
 	lock         sync.RWMutex
 	lock         sync.RWMutex
 }
 }
 
 
@@ -51,8 +52,7 @@ func (st *MemSessionStore) SessionID() string {
 	return st.sid
 	return st.sid
 }
 }
 
 
-func (st *MemSessionStore) SessionRelease() {
-
+func (st *MemSessionStore) SessionRelease(w http.ResponseWriter) {
 }
 }
 
 
 type MemProvider struct {
 type MemProvider struct {

+package session
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+)
+
+func TestMem(t *testing.T) {
+	globalSessions, _ := NewManager("memory", `{"cookieName":"gosessionid","gclifetime":10}`)
+	go globalSessions.GC()
+	r, _ := http.NewRequest("GET", "/", nil)
+	w := httptest.NewRecorder()
+	sess := globalSessions.SessionStart(w, r)
+	defer sess.SessionRelease(w)
+	err := sess.Set("username", "astaxie")
+	if err != nil {
+		t.Fatal("set error,", err)
+	}
+	if username := sess.Get("username"); username != "astaxie" {
+		t.Fatal("get username error")
+	}
+	if cookiestr := w.Header().Get("Set-Cookie"); cookiestr == "" {
+		t.Fatal("setcookie error")
+	} else {
+		parts := strings.Split(strings.TrimSpace(cookiestr), ";")
+		for k, v := range parts {
+			nameval := strings.Split(v, "=")
+			if k == 0 && nameval[0] != "gosessionid" {
+				t.Fatal("error")
+			}
+		}
+	}
+}

@@ -9,6 +9,7 @@ package session
 
 
 import (
 import (
 	"database/sql"
 	"database/sql"
+	"net/http"
 	"sync"
 	"sync"
 	"time"
 	"time"
 
 
@@ -60,7 +61,7 @@ func (st *MysqlSessionStore) SessionID() string {
 	return st.sid
 	return st.sid
 }
 }
 
 
-func (st *MysqlSessionStore) SessionRelease() {
+func (st *MysqlSessionStore) SessionRelease(w http.ResponseWriter) {
 	defer st.c.Close()
 	defer st.c.Close()
 	if len(st.values) > 0 {
 	if len(st.values) > 0 {
 		b, err := encodeGob(st.values)
 		b, err := encodeGob(st.values)

 package session
 package session
 
 
 import (
 import (
+	"net/http"
 	"strconv"
 	"strconv"
 	"strings"
 	"strings"
 	"sync"
 	"sync"
@@ -58,7 +59,7 @@ func (rs *RedisSessionStore) SessionID() string {
 	return rs.sid
 	return rs.sid
 }
 }
 
 
-func (rs *RedisSessionStore) SessionRelease() {
+func (rs *RedisSessionStore) SessionRelease(w http.ResponseWriter) {
 	defer rs.c.Close()
 	defer rs.c.Close()
 	if len(rs.values) > 0 {
 	if len(rs.values) > 0 {
 		b, err := encodeGob(rs.values)
 		b, err := encodeGob(rs.values)

 package session
 package session
 
 
 import (
 import (
+	"crypto/aes"
+	"encoding/json"
 	"testing"
 	"testing"
 )
 )
 
 
@@ -26,3 +28,82 @@ func Test_gob(t *testing.T) {
 		t.Error("decode int error")
 		t.Error("decode int error")
 	}
 	}
 }
 }
+
+func TestGenerate(t *testing.T) {
+	str := generateRandomKey(20)
+	if len(str) != 20 {
+		t.Fatal("generate length is not equal to 20")
+	}
+}
+
+func TestCookieEncodeDecode(t *testing.T) {
+	hashKey := "testhashKey"
+	blockkey := generateRandomKey(16)
+	block, err := aes.NewCipher(blockkey)
+	if err != nil {
+		t.Fatal("NewCipher:", err)
+	}
+	securityName := string(generateRandomKey(20))
+	val := make(map[interface{}]interface{})
+	val["name"] = "astaxie"
+	val["gender"] = "male"
+	str, err := encodeCookie(block, hashKey, securityName, val)
+	if err != nil {
+		t.Fatal("encodeCookie:", err)
+	}
+	dst := make(map[interface{}]interface{})
+	dst, err = decodeCookie(block, hashKey, securityName, str, 3600)
+	if err != nil {
+		t.Fatal("decodeCookie", err)
+	}
+	if dst["name"] != "astaxie" {
+		t.Fatal("dst get map error")
+	}
+	if dst["gender"] != "male" {
+		t.Fatal("dst get map error")
+	}
+}
+
+func TestParseConfig(t *testing.T) {
+	s := `{"cookieName":"gosessionid","gclifetime":3600}`
+	cf := new(managerConfig)
+	cf.EnableSetCookie = true
+	err := json.Unmarshal([]byte(s), cf)
+	if err != nil {
+		t.Fatal("parse json error,", err)
+	}
+	if cf.CookieName != "gosessionid" {
+		t.Fatal("parseconfig get cookiename error")
+	}
+	if cf.Gclifetime != 3600 {
+		t.Fatal("parseconfig get gclifetime error")
+	}
+
+	cc := `{"cookieName":"gosessionid","enableSetCookie":false,"gclifetime":3600,"ProviderConfig":"{\"cookieName\":\"gosessionid\",\"securityKey\":\"beegocookiehashkey\"}"}`
+	cf2 := new(managerConfig)
+	cf2.EnableSetCookie = true
+	err = json.Unmarshal([]byte(cc), cf2)
+	if err != nil {
+		t.Fatal("parse json error,", err)
+	}
+	if cf2.CookieName != "gosessionid" {
+		t.Fatal("parseconfig get cookiename error")
+	}
+	if cf2.Gclifetime != 3600 {
+		t.Fatal("parseconfig get gclifetime error")
+	}
+	if cf2.EnableSetCookie != false {
+		t.Fatal("parseconfig get enableSetCookie error")
+	}
+	cconfig := new(cookieConfig)
+	err = json.Unmarshal([]byte(cf2.ProviderConfig), cconfig)
+	if err != nil {
+		t.Fatal("parse ProviderConfig err,", err)
+	}
+	if cconfig.CookieName != "gosessionid" {
+		t.Fatal("ProviderConfig get cookieName error")
+	}
+	if cconfig.SecurityKey != "beegocookiehashkey" {
+		t.Fatal("ProviderConfig get securityKey error")
+	}
+}

+package session
+
+import (
+	"bytes"
+	"crypto/cipher"
+	"crypto/hmac"
+	"crypto/rand"
+	"crypto/sha1"
+	"crypto/subtle"
+	"encoding/base64"
+	"encoding/gob"
+	"errors"
+	"fmt"
+	"io"
+	"strconv"
+	"time"
+)
+
+func init() {
+	gob.Register([]interface{}{})
+	gob.Register(map[int]interface{}{})
+	gob.Register(map[string]interface{}{})
+	gob.Register(map[interface{}]interface{}{})
+	gob.Register(map[string]string{})
+	gob.Register(map[int]string{})
+	gob.Register(map[int]int{})
+	gob.Register(map[int]int64{})
+}
+
+func encodeGob(obj map[interface{}]interface{}) ([]byte, error) {
+	buf := bytes.NewBuffer(nil)
+	enc := gob.NewEncoder(buf)
+	err := enc.Encode(obj)
+	if err != nil {
+		return []byte(""), err
+	}
+	return buf.Bytes(), nil
+}
+
+func decodeGob(encoded []byte) (map[interface{}]interface{}, error) {
+	buf := bytes.NewBuffer(encoded)
+	dec := gob.NewDecoder(buf)
+	var out map[interface{}]interface{}
+	err := dec.Decode(&out)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// generateRandomKey creates a random key with the given strength.
+func generateRandomKey(strength int) []byte {
+	k := make([]byte, strength)
+	if _, err := io.ReadFull(rand.Reader, k); err != nil {
+		return nil
+	}
+	return k
+}
+
+// Encryption -----------------------------------------------------------------
+
+// encrypt encrypts a value using the given block in counter mode.
+//
+// A random initialization vector (http://goo.gl/zF67k) with the length of the
+// block size is prepended to the resulting ciphertext.
+func encrypt(block cipher.Block, value []byte) ([]byte, error) {
+	iv := generateRandomKey(block.BlockSize())
+	if iv == nil {
+		return nil, errors.New("encrypt: failed to generate random iv")
+	}
+	// Encrypt it.
+	stream := cipher.NewCTR(block, iv)
+	stream.XORKeyStream(value, value)
+	// Return iv + ciphertext.
+	return append(iv, value...), nil
+}
+
+// decrypt decrypts a value using the given block in counter mode.
+//
+// The value to be decrypted must be prepended by a initialization vector
+// (http://goo.gl/zF67k) with the length of the block size.
+func decrypt(block cipher.Block, value []byte) ([]byte, error) {
+	size := block.BlockSize()
+	if len(value) > size {
+		// Extract iv.
+		iv := value[:size]
+		// Extract ciphertext.
+		value = value[size:]
+		// Decrypt it.
+		stream := cipher.NewCTR(block, iv)
+		stream.XORKeyStream(value, value)
+		return value, nil
+	}
+	return nil, errors.New("decrypt: the value could not be decrypted")
+}
+
+func encodeCookie(block cipher.Block, hashKey, name string, value map[interface{}]interface{}) (string, error) {
+	var err error
+	var b []byte
+	// 1. encodeGob.
+	if b, err = encodeGob(value); err != nil {
+		return "", err
+	}
+	// 2. Encrypt (optional).
+	if b, err = encrypt(block, b); err != nil {
+		return "", err
+	}
+	b = encode(b)
+	// 3. Create MAC for "name|date|value". Extra pipe to be used later.
+	b = []byte(fmt.Sprintf("%s|%d|%s|", name, time.Now().UTC().Unix(), b))
+	h := hmac.New(sha1.New, []byte(hashKey))
+	h.Write(b)
+	sig := h.Sum(nil)
+	// Append mac, remove name.
+	b = append(b, sig...)[len(name)+1:]
+	// 4. Encode to base64.
+	b = encode(b)
+	// Done.
+	return string(b), nil
+}
+
+func decodeCookie(block cipher.Block, hashKey, name, value string, gcmaxlifetime int64) (map[interface{}]interface{}, error) {
+	// 1. Decode from base64.
+	b, err := decode([]byte(value))
+	if err != nil {
+		return nil, err
+	}
+	// 2. Verify MAC. Value is "date|value|mac".
+	parts := bytes.SplitN(b, []byte("|"), 3)
+	if len(parts) != 3 {
+		return nil, errors.New("Decode: invalid value %v")
+	}
+
+	b = append([]byte(name+"|"), b[:len(b)-len(parts[2])]...)
+	h := hmac.New(sha1.New, []byte(hashKey))
+	h.Write(b)
+	sig := h.Sum(nil)
+	if len(sig) != len(parts[2]) || subtle.ConstantTimeCompare(sig, parts[2]) != 1 {
+		return nil, errors.New("Decode: the value is not valid")
+	}
+	// 3. Verify date ranges.
+	var t1 int64
+	if t1, err = strconv.ParseInt(string(parts[0]), 10, 64); err != nil {
+		return nil, errors.New("Decode: invalid timestamp")
+	}
+	t2 := time.Now().UTC().Unix()
+	if t1 > t2 {
+		return nil, errors.New("Decode: timestamp is too new")
+	}
+	if t1 < t2-gcmaxlifetime {
+		return nil, errors.New("Decode: expired timestamp")
+	}
+	// 4. Decrypt (optional).
+	b, err = decode(parts[1])
+	if err != nil {
+		return nil, err
+	}
+	if b, err = decrypt(block, b); err != nil {
+		return nil, err
+	}
+	// 5. decodeGob.
+	if dst, err := decodeGob(b); err != nil {
+		return nil, err
+	} else {
+		return dst, nil
+	}
+	// Done.
+	return nil, nil
+}
+
+// Encoding -------------------------------------------------------------------
+
+// encode encodes a value using base64.
+func encode(value []byte) []byte {
+	encoded := make([]byte, base64.URLEncoding.EncodedLen(len(value)))
+	base64.URLEncoding.Encode(encoded, value)
+	return encoded
+}
+
+// decode decodes a cookie using base64.
+func decode(value []byte) ([]byte, error) {
+	decoded := make([]byte, base64.URLEncoding.DecodedLen(len(value)))
+	b, err := base64.URLEncoding.Decode(decoded, value)
+	if err != nil {
+		return nil, err
+	}
+	return decoded[:b], nil
+}

@@ -6,6 +6,7 @@ import (
 	"crypto/rand"
 	"crypto/rand"
 	"crypto/sha1"
 	"crypto/sha1"
 	"encoding/hex"
 	"encoding/hex"
+	"encoding/json"
 	"fmt"
 	"fmt"
 	"io"
 	"io"
 	"net/http"
 	"net/http"
@@ -14,16 +15,16 @@ import (
 )
 )
 
 
 type SessionStore interface {
 type SessionStore interface {
-	Set(key, value interface{}) error //set session value
-	Get(key interface{}) interface{}  //get session value
-	Delete(key interface{}) error     //delete session value
-	SessionID() string                //back current sessionID
-	SessionRelease()                  // release the resource & save data to provider
-	Flush() error                     //delete all data
+	Set(key, value interface{}) error     //set session value
+	Get(key interface{}) interface{}      //get session value
+	Delete(key interface{}) error         //delete session value
+	SessionID() string                    //back current sessionID
+	SessionRelease(w http.ResponseWriter) // release the resource & save data to provider & return the data
+	Flush() error                         //delete all data
 }
 }
 
 
 type Provider interface {
 type Provider interface {
-	SessionInit(maxlifetime int64, savePath string) error
+	SessionInit(gclifetime int64, config string) error
 	SessionRead(sid string) (SessionStore, error)
 	SessionRead(sid string) (SessionStore, error)
 	SessionExist(sid string) bool
 	SessionExist(sid string) bool
 	SessionRegenerate(oldsid, sid string) (SessionStore, error)
 	SessionRegenerate(oldsid, sid string) (SessionStore, error)
@@ -47,15 +48,21 @@ func Register(name string, provide Provider) {
 	provides[name] = provide
 	provides[name] = provide
 }
 }
 
 
+type managerConfig struct {
+	CookieName        string `json:"cookieName"`
+	EnableSetCookie   bool   `json:"enableSetCookie,omitempty"`
+	Gclifetime        int64  `json:"gclifetime"`
+	Maxage            int    `json:"maxage"`
+	Secure            bool   `json:"secure"`
+	SessionIDHashFunc string `json:"sessionIDHashFunc"`
+	SessionIDHashKey  string `json:"sessionIDHashKey"`
+	CookieLifeTime    int64  `json:"cookieLifeTime"`
+	ProviderConfig    string `json:"providerConfig"`
+}
+
 type Manager struct {
 type Manager struct {
-	cookieName  string //private cookiename
-	provider    Provider
-	maxlifetime int64
-	hashfunc    string //support md5 & sha1
-	hashkey     string
-	maxage      int //cookielifetime
-	secure      bool
-	options     []interface{}
+	provider Provider
+	config   *managerConfig
 }
 }
 
 
 //options
 //options
@@ -63,74 +70,49 @@ type Manager struct {
 //2. hashfunc  default sha1
 //2. hashfunc  default sha1
 //3. hashkey default beegosessionkey
 //3. hashkey default beegosessionkey
 //4. maxage default is none
 //4. maxage default is none
-func NewManager(provideName, cookieName string, maxlifetime int64, savePath string, options ...interface{}) (*Manager, error) {
+func NewManager(provideName, config string) (*Manager, error) {
 	provider, ok := provides[provideName]
 	provider, ok := provides[provideName]
 	if !ok {
 	if !ok {
 		return nil, fmt.Errorf("session: unknown provide %q (forgotten import?)", provideName)
 		return nil, fmt.Errorf("session: unknown provide %q (forgotten import?)", provideName)
 	}
 	}
-	provider.SessionInit(maxlifetime, savePath)
-	secure := false
-	if len(options) > 0 {
-		secure = options[0].(bool)
+	cf := new(managerConfig)
+	cf.EnableSetCookie = true
+	err := json.Unmarshal([]byte(config), cf)
+	if err != nil {
+		return nil, err
 	}
 	}
-	hashfunc := "sha1"
-	if len(options) > 1 {
-		hashfunc = options[1].(string)
-	}
-	hashkey := "beegosessionkey"
-	if len(options) > 2 {
-		hashkey = options[2].(string)
+	provider.SessionInit(cf.Gclifetime, cf.ProviderConfig)
+
+	if cf.SessionIDHashFunc == "" {
+		cf.SessionIDHashFunc = "sha1"
 	}
 	}
-	maxage := -1
-	if len(options) > 3 {
-		switch options[3].(type) {
-		case int:
-			if options[3].(int) > 0 {
-				maxage = options[3].(int)
-			} else if options[3].(int) < 0 {
-				maxage = 0
-			}
-		case int64:
-			if options[3].(int64) > 0 {
-				maxage = int(options[3].(int64))
-			} else if options[3].(int64) < 0 {
-				maxage = 0
-			}
-		case int32:
-			if options[3].(int32) > 0 {
-				maxage = int(options[3].(int32))
-			} else if options[3].(int32) < 0 {
-				maxage = 0
-			}
-		}
+	if cf.SessionIDHashKey == "" {
+		cf.SessionIDHashKey = string(generateRandomKey(16))
 	}
 	}
+
 	return &Manager{
 	return &Manager{
-		provider:    provider,
-		cookieName:  cookieName,
-		maxlifetime: maxlifetime,
-		hashfunc:    hashfunc,
-		hashkey:     hashkey,
-		maxage:      maxage,
-		secure:      secure,
-		options:     options,
+		provider,
+		cf,
 	}, nil
 	}, nil
 }
 }
 
 
 //get Session
 //get Session
 func (manager *Manager) SessionStart(w http.ResponseWriter, r *http.Request) (session SessionStore) {
 func (manager *Manager) SessionStart(w http.ResponseWriter, r *http.Request) (session SessionStore) {
-	cookie, err := r.Cookie(manager.cookieName)
+	cookie, err := r.Cookie(manager.config.CookieName)
 	if err != nil || cookie.Value == "" {
 	if err != nil || cookie.Value == "" {
 		sid := manager.sessionId(r)
 		sid := manager.sessionId(r)
 		session, _ = manager.provider.SessionRead(sid)
 		session, _ = manager.provider.SessionRead(sid)
-		cookie = &http.Cookie{Name: manager.cookieName,
+		cookie = &http.Cookie{Name: manager.config.CookieName,
 			Value:    url.QueryEscape(sid),
 			Value:    url.QueryEscape(sid),
 			Path:     "/",
 			Path:     "/",
 			HttpOnly: true,
 			HttpOnly: true,
-			Secure:   manager.secure}
-		if manager.maxage >= 0 {
-			cookie.MaxAge = manager.maxage
+			Secure:   manager.config.Secure}
+		if manager.config.Maxage >= 0 {
+			cookie.MaxAge = manager.config.Maxage
+		}
+		if manager.config.EnableSetCookie {
+			http.SetCookie(w, cookie)
 		}
 		}
-		http.SetCookie(w, cookie)
 		r.AddCookie(cookie)
 		r.AddCookie(cookie)
 	} else {
 	} else {
 		sid, _ := url.QueryUnescape(cookie.Value)
 		sid, _ := url.QueryUnescape(cookie.Value)
@@ -139,15 +121,17 @@ func (manager *Manager) SessionStart(w http.ResponseWriter, r *http.Request) (se
 		} else {
 		} else {
 			sid = manager.sessionId(r)
 			sid = manager.sessionId(r)
 			session, _ = manager.provider.SessionRead(sid)
 			session, _ = manager.provider.SessionRead(sid)
-			cookie = &http.Cookie{Name: manager.cookieName,
+			cookie = &http.Cookie{Name: manager.config.CookieName,
 				Value:    url.QueryEscape(sid),
 				Value:    url.QueryEscape(sid),
 				Path:     "/",
 				Path:     "/",
 				HttpOnly: true,
 				HttpOnly: true,
-				Secure:   manager.secure}
-			if manager.maxage >= 0 {
-				cookie.MaxAge = manager.maxage
+				Secure:   manager.config.Secure}
+			if manager.config.Maxage >= 0 {
+				cookie.MaxAge = manager.config.Maxage
+			}
+			if manager.config.EnableSetCookie {
+				http.SetCookie(w, cookie)
 			}
 			}
-			http.SetCookie(w, cookie)
 			r.AddCookie(cookie)
 			r.AddCookie(cookie)
 		}
 		}
 	}
 	}
@@ -156,13 +140,17 @@ func (manager *Manager) SessionStart(w http.ResponseWriter, r *http.Request) (se
 
 
 //Destroy sessionid
 //Destroy sessionid
 func (manager *Manager) SessionDestroy(w http.ResponseWriter, r *http.Request) {
 func (manager *Manager) SessionDestroy(w http.ResponseWriter, r *http.Request) {
-	cookie, err := r.Cookie(manager.cookieName)
+	cookie, err := r.Cookie(manager.config.CookieName)
 	if err != nil || cookie.Value == "" {
 	if err != nil || cookie.Value == "" {
 		return
 		return
 	} else {
 	} else {
 		manager.provider.SessionDestroy(cookie.Value)
 		manager.provider.SessionDestroy(cookie.Value)
 		expiration := time.Now()
 		expiration := time.Now()
-		cookie := http.Cookie{Name: manager.cookieName, Path: "/", HttpOnly: true, Expires: expiration, MaxAge: -1}
+		cookie := http.Cookie{Name: manager.config.CookieName,
+			Path:     "/",
+			HttpOnly: true,
+			Expires:  expiration,
+			MaxAge:   -1}
 		http.SetCookie(w, &cookie)
 		http.SetCookie(w, &cookie)
 	}
 	}
 }
 }
@@ -174,20 +162,20 @@ func (manager *Manager) GetProvider(sid string) (sessions SessionStore, err erro
 
 
 func (manager *Manager) GC() {
 func (manager *Manager) GC() {
 	manager.provider.SessionGC()
 	manager.provider.SessionGC()
-	time.AfterFunc(time.Duration(manager.maxlifetime)*time.Second, func() { manager.GC() })
+	time.AfterFunc(time.Duration(manager.config.Gclifetime)*time.Second, func() { manager.GC() })
 }
 }
 
 
 func (manager *Manager) SessionRegenerateId(w http.ResponseWriter, r *http.Request) (session SessionStore) {
 func (manager *Manager) SessionRegenerateId(w http.ResponseWriter, r *http.Request) (session SessionStore) {
 	sid := manager.sessionId(r)
 	sid := manager.sessionId(r)
-	cookie, err := r.Cookie(manager.cookieName)
+	cookie, err := r.Cookie(manager.config.CookieName)
 	if err != nil && cookie.Value == "" {
 	if err != nil && cookie.Value == "" {
 		//delete old cookie
 		//delete old cookie
 		session, _ = manager.provider.SessionRead(sid)
 		session, _ = manager.provider.SessionRead(sid)
-		cookie = &http.Cookie{Name: manager.cookieName,
+		cookie = &http.Cookie{Name: manager.config.CookieName,
 			Value:    url.QueryEscape(sid),
 			Value:    url.QueryEscape(sid),
 			Path:     "/",
 			Path:     "/",
 			HttpOnly: true,
 			HttpOnly: true,
-			Secure:   manager.secure,
+			Secure:   manager.config.Secure,
 		}
 		}
 	} else {
 	} else {
 		oldsid, _ := url.QueryUnescape(cookie.Value)
 		oldsid, _ := url.QueryUnescape(cookie.Value)
@@ -196,8 +184,8 @@ func (manager *Manager) SessionRegenerateId(w http.ResponseWriter, r *http.Reque
 		cookie.HttpOnly = true
 		cookie.HttpOnly = true
 		cookie.Path = "/"
 		cookie.Path = "/"
 	}
 	}
-	if manager.maxage >= 0 {
-		cookie.MaxAge = manager.maxage
+	if manager.config.Maxage >= 0 {
+		cookie.MaxAge = manager.config.Maxage
 	}
 	}
 	http.SetCookie(w, cookie)
 	http.SetCookie(w, cookie)
 	r.AddCookie(cookie)
 	r.AddCookie(cookie)
@@ -209,12 +197,12 @@ func (manager *Manager) GetActiveSession() int {
 }
 }
 
 
 func (manager *Manager) SetHashFunc(hasfunc, hashkey string) {
 func (manager *Manager) SetHashFunc(hasfunc, hashkey string) {
-	manager.hashfunc = hasfunc
-	manager.hashkey = hashkey
+	manager.config.SessionIDHashFunc = hasfunc
+	manager.config.SessionIDHashKey = hashkey
 }
 }
 
 
 func (manager *Manager) SetSecure(secure bool) {
 func (manager *Manager) SetSecure(secure bool) {
-	manager.secure = secure
+	manager.config.Secure = secure
 }
 }
 
 
 //remote_addr cruunixnano randdata
 //remote_addr cruunixnano randdata
@@ -224,16 +212,16 @@ func (manager *Manager) sessionId(r *http.Request) (sid string) {
 		return ""
 		return ""
 	}
 	}
 	sig := fmt.Sprintf("%s%d%s", r.RemoteAddr, time.Now().UnixNano(), bs)
 	sig := fmt.Sprintf("%s%d%s", r.RemoteAddr, time.Now().UnixNano(), bs)
-	if manager.hashfunc == "md5" {
+	if manager.config.SessionIDHashFunc == "md5" {
 		h := md5.New()
 		h := md5.New()
 		h.Write([]byte(sig))
 		h.Write([]byte(sig))
 		sid = hex.EncodeToString(h.Sum(nil))
 		sid = hex.EncodeToString(h.Sum(nil))
-	} else if manager.hashfunc == "sha1" {
-		h := hmac.New(sha1.New, []byte(manager.hashkey))
+	} else if manager.config.SessionIDHashFunc == "sha1" {
+		h := hmac.New(sha1.New, []byte(manager.config.SessionIDHashKey))
 		fmt.Fprintf(h, "%s", sig)
 		fmt.Fprintf(h, "%s", sig)
 		sid = hex.EncodeToString(h.Sum(nil))
 		sid = hex.EncodeToString(h.Sum(nil))
 	} else {
 	} else {
-		h := hmac.New(sha1.New, []byte(manager.hashkey))
+		h := hmac.New(sha1.New, []byte(manager.config.SessionIDHashKey))
 		fmt.Fprintf(h, "%s", sig)
 		fmt.Fprintf(h, "%s", sig)
 		sid = hex.EncodeToString(h.Sum(nil))
 		sid = hex.EncodeToString(h.Sum(nil))
 	}
 	}