Provides functionality to set the MaxAge on the underlying securecook…

…ie Codecs.

- Addresses gorilla#48

store.go

@@ -51,13 +51,16 @@ type Store interface {
 // Use the convenience function securecookie.GenerateRandomKey() to create
 // strong keys.
 func NewCookieStore(keyPairs ...[]byte) *CookieStore {
-	return &CookieStore{
+	cs := &CookieStore{
 		Codecs: securecookie.CodecsFromPairs(keyPairs...),
 		Options: &Options{
 			Path:   "/",
 			MaxAge: 86400 * 30,
 		},
 	}
+
+	cs.MaxAge(cs.Options.MaxAge)
+	return cs
 }
 
 // CookieStore stores sessions using secure cookies.
@@ -110,6 +113,20 @@ func (s *CookieStore) Save(r *http.Request, w http.ResponseWriter,
 	return nil
 }
 
+// MaxAge sets the maximum age for the store and the underlying cookie
+// implementation.  Individual sessions can be deleted by setting Options.MaxAge
+// = -1 for that session.
+func (s *CookieStore) MaxAge(age int) {
+	s.Options.MaxAge = age
+
+	// Set the maxAge for each securecookie instance.
+	for _, codec := range s.Codecs {
+		if sc, ok := codec.(*securecookie.SecureCookie); ok {
+			sc.MaxAge(age)
+		}
+	}
+}
+
 // FilesystemStore ------------------------------------------------------------
 
 var fileMutex sync.RWMutex
@@ -124,14 +141,17 @@ func NewFilesystemStore(path string, keyPairs ...[]byte) *FilesystemStore {
 	if path == "" {
 		path = os.TempDir()
 	}
-	return &FilesystemStore{
+	fs := &FilesystemStore{
 		Codecs: securecookie.CodecsFromPairs(keyPairs...),
 		Options: &Options{
 			Path:   "/",
 			MaxAge: 86400 * 30,
 		},
 		path: path,
 	}
+
+	fs.MaxAge(fs.Options.MaxAge)
+	return fs
 }
 
 // FilesystemStore stores sessions in the filesystem.
@@ -206,6 +226,20 @@ func (s *FilesystemStore) Save(r *http.Request, w http.ResponseWriter,
 	return nil
 }
 
+// MaxAge sets the maximum age for the store and the underlying cookie
+// implementation.  Individual sessions can be deleted by setting Options.MaxAge
+// = -1 for that session.
+func (s *FilesystemStore) MaxAge(age int) {
+	s.Options.MaxAge = age
+
+	// Set the maxAge for each securecookie instance.
+	for _, codec := range s.Codecs {
+		if sc, ok := codec.(*securecookie.SecureCookie); ok {
+			sc.MaxAge(age)
+		}
+	}
+}
+
 // save writes encoded session.Values to a file.
 func (s *FilesystemStore) save(session *Session) error {
 	encoded, err := securecookie.EncodeMulti(session.Name(), session.Values,