105 lines
2.4 KiB
Go
105 lines
2.4 KiB
Go
package services
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import (
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"encoding/gob"
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"errors"
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"fmt"
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"html/template"
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"log"
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"net/http"
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"time"
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"github.com/alexedwards/scs"
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)
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const (
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// FlashesKey is the key used for the flashes in the cookie
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FlashesKey = "_flashes"
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// UserEmailKey is the key used to reference usernames
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UserEmailKey = "_user_email"
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)
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func init() {
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// Register the Flash message type, so gob can serialize it
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gob.Register(Flash{})
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}
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type SessionsConfig struct {
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HTTPOnly bool
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Secure bool
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Lifetime time.Duration
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}
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// Sessions is a wrapped scs.Store in order to implement custom logic
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type Sessions struct {
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*scs.Session
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}
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// NewSessions populates the default sessions Store
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func NewSessions(conf *SessionsConfig) *Sessions {
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session := scs.NewSession()
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session.Lifetime = conf.Lifetime
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session.Cookie.HttpOnly = true
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session.Cookie.Secure = conf.Secure
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return &Sessions{session}
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}
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func (store *Sessions) GetUsername(req *http.Request) string {
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if store == nil {
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// if store was not initialized, all requests fail
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log.Println("Nil pointer when checking session for username")
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return ""
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}
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email := store.GetString(req.Context(), UserEmailKey)
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return email // "" if no user is logged in
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}
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func (store *Sessions) SetUsername(w http.ResponseWriter, req *http.Request, username string) {
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if store == nil {
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// if store was not initialized, do nothing
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return
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}
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// renew token to avoid session pinning/fixation attack
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store.RenewToken(req.Context())
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store.Put(req.Context(), UserEmailKey, username)
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}
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type Flash struct {
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Message template.HTML
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Type string
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}
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// Render renders the flash message as a notification box
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func (flash Flash) Render() template.HTML {
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return template.HTML(
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fmt.Sprintf(
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"<div class=\"notification is-radiusless is-%s\"><div class=\"container has-text-centered\">%s</div></div>",
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flash.Type, flash.Message,
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),
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)
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}
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// Flash add flash message to session data
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func (store *Sessions) Flash(w http.ResponseWriter, req *http.Request, flash Flash) error {
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flashes, ok := store.Get(req.Context(), FlashesKey).([]Flash)
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if !ok {
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return errors.New("Could not get flashes")
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}
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flashes = append(flashes, flash)
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return nil
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}
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// Flashes returns a slice of flash messages from session data
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func (store *Sessions) Flashes(w http.ResponseWriter, req *http.Request) []Flash {
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flashes, ok := store.Pop(req.Context(), FlashesKey).([]Flash)
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if !ok {
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return nil
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}
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return flashes
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}
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