mtfosbot/vendor/github.com/gin-gonic/contrib/sessions/sessions.go
2018-09-02 09:15:35 +08:00

148 lines
3.5 KiB
Go

package sessions
import (
"log"
"net/http"
"github.com/gin-gonic/gin"
"github.com/gorilla/context"
"github.com/gorilla/sessions"
)
const (
DefaultKey = "github.com/gin-gonic/contrib/sessions"
errorFormat = "[sessions] ERROR! %s\n"
)
type Store interface {
sessions.Store
Options(Options)
}
// Options stores configuration for a session or session store.
// Fields are a subset of http.Cookie fields.
type Options struct {
Path string
Domain string
// MaxAge=0 means no 'Max-Age' attribute specified.
// MaxAge<0 means delete cookie now, equivalently 'Max-Age: 0'.
// MaxAge>0 means Max-Age attribute present and given in seconds.
MaxAge int
Secure bool
HttpOnly bool
}
// Wraps thinly gorilla-session methods.
// Session stores the values and optional configuration for a session.
type Session interface {
// Get returns the session value associated to the given key.
Get(key interface{}) interface{}
// Set sets the session value associated to the given key.
Set(key interface{}, val interface{})
// Delete removes the session value associated to the given key.
Delete(key interface{})
// Clear deletes all values in the session.
Clear()
// AddFlash adds a flash message to the session.
// A single variadic argument is accepted, and it is optional: it defines the flash key.
// If not defined "_flash" is used by default.
AddFlash(value interface{}, vars ...string)
// Flashes returns a slice of flash messages from the session.
// A single variadic argument is accepted, and it is optional: it defines the flash key.
// If not defined "_flash" is used by default.
Flashes(vars ...string) []interface{}
// Options sets confuguration for a session.
Options(Options)
// Save saves all sessions used during the current request.
Save() error
}
func Sessions(name string, store Store) gin.HandlerFunc {
return func(c *gin.Context) {
s := &session{name, c.Request, store, nil, false, c.Writer}
c.Set(DefaultKey, s)
defer context.Clear(c.Request)
c.Next()
}
}
type session struct {
name string
request *http.Request
store Store
session *sessions.Session
written bool
writer http.ResponseWriter
}
func (s *session) Get(key interface{}) interface{} {
return s.Session().Values[key]
}
func (s *session) Set(key interface{}, val interface{}) {
s.Session().Values[key] = val
s.written = true
}
func (s *session) Delete(key interface{}) {
delete(s.Session().Values, key)
s.written = true
}
func (s *session) Clear() {
for key := range s.Session().Values {
s.Delete(key)
}
}
func (s *session) AddFlash(value interface{}, vars ...string) {
s.Session().AddFlash(value, vars...)
s.written = true
}
func (s *session) Flashes(vars ...string) []interface{} {
s.written = true
return s.Session().Flashes(vars...)
}
func (s *session) Options(options Options) {
s.Session().Options = &sessions.Options{
Path: options.Path,
Domain: options.Domain,
MaxAge: options.MaxAge,
Secure: options.Secure,
HttpOnly: options.HttpOnly,
}
}
func (s *session) Save() error {
if s.Written() {
e := s.Session().Save(s.request, s.writer)
if e == nil {
s.written = false
}
return e
}
return nil
}
func (s *session) Session() *sessions.Session {
if s.session == nil {
var err error
s.session, err = s.store.Get(s.request, s.name)
if err != nil {
log.Printf(errorFormat, err)
}
}
return s.session
}
func (s *session) Written() bool {
return s.written
}
// shortcut to get session
func Default(c *gin.Context) Session {
return c.MustGet(DefaultKey).(Session)
}