153 lines
3.6 KiB
Go
153 lines
3.6 KiB
Go
package sessions
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import (
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"log"
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"net/http"
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"github.com/gin-gonic/gin"
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"github.com/gorilla/context"
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"github.com/gorilla/sessions"
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)
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const (
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DefaultKey = "github.com/gin-contrib/sessions"
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errorFormat = "[sessions] ERROR! %s\n"
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)
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type Store interface {
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sessions.Store
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Options(Options)
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}
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// Wraps thinly gorilla-session methods.
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// Session stores the values and optional configuration for a session.
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type Session interface {
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// ID of the session, generated by stores. It should not be used for user data.
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ID() string
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// Get returns the session value associated to the given key.
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Get(key interface{}) interface{}
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// Set sets the session value associated to the given key.
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Set(key interface{}, val interface{})
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// Delete removes the session value associated to the given key.
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Delete(key interface{})
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// Clear deletes all values in the session.
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Clear()
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// AddFlash adds a flash message to the session.
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// A single variadic argument is accepted, and it is optional: it defines the flash key.
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// If not defined "_flash" is used by default.
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AddFlash(value interface{}, vars ...string)
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// Flashes returns a slice of flash messages from the session.
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// A single variadic argument is accepted, and it is optional: it defines the flash key.
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// If not defined "_flash" is used by default.
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Flashes(vars ...string) []interface{}
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// Options sets configuration for a session.
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Options(Options)
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// Save saves all sessions used during the current request.
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Save() error
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}
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func Sessions(name string, store Store) gin.HandlerFunc {
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return func(c *gin.Context) {
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s := &session{name, c.Request, store, nil, false, c.Writer}
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c.Set(DefaultKey, s)
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defer context.Clear(c.Request)
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c.Next()
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}
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}
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func SessionsMany(names []string, store Store) gin.HandlerFunc {
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return func(c *gin.Context) {
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sessions := make(map[string]Session, len(names))
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for _, name := range names {
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sessions[name] = &session{name, c.Request, store, nil, false, c.Writer}
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}
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c.Set(DefaultKey, sessions)
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defer context.Clear(c.Request)
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c.Next()
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}
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}
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type session struct {
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name string
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request *http.Request
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store Store
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session *sessions.Session
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written bool
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writer http.ResponseWriter
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}
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func (s *session) ID() string {
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return s.Session().ID
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}
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func (s *session) Get(key interface{}) interface{} {
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return s.Session().Values[key]
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}
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func (s *session) Set(key interface{}, val interface{}) {
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s.Session().Values[key] = val
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s.written = true
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}
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func (s *session) Delete(key interface{}) {
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delete(s.Session().Values, key)
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s.written = true
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}
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func (s *session) Clear() {
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for key := range s.Session().Values {
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s.Delete(key)
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}
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}
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func (s *session) AddFlash(value interface{}, vars ...string) {
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s.Session().AddFlash(value, vars...)
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s.written = true
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}
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func (s *session) Flashes(vars ...string) []interface{} {
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s.written = true
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return s.Session().Flashes(vars...)
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}
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func (s *session) Options(options Options) {
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s.written = true
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s.Session().Options = options.ToGorillaOptions()
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}
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func (s *session) Save() error {
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if s.Written() {
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e := s.Session().Save(s.request, s.writer)
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if e == nil {
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s.written = false
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}
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return e
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}
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return nil
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}
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func (s *session) Session() *sessions.Session {
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if s.session == nil {
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var err error
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s.session, err = s.store.Get(s.request, s.name)
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if err != nil {
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log.Printf(errorFormat, err)
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}
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}
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return s.session
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}
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func (s *session) Written() bool {
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return s.written
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}
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// shortcut to get session
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func Default(c *gin.Context) Session {
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return c.MustGet(DefaultKey).(Session)
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}
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// shortcut to get session with given name
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func DefaultMany(c *gin.Context, name string) Session {
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return c.MustGet(DefaultKey).(map[string]Session)[name]
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}
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