124 lines
2.5 KiB
Go
124 lines
2.5 KiB
Go
package services
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import (
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"encoding/gob"
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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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var (
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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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SessionName string
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CookieKey string
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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.Manager
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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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store := scs.NewCookieManager(
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conf.CookieKey,
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)
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store.Name(conf.SessionName)
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store.HttpOnly(true)
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store.Lifetime(conf.Lifetime)
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store.Secure(conf.Secure)
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return &Sessions{store}
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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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sess := store.Load(req)
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email, err := sess.GetString(UserEmailKey)
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if err != nil {
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// Username found
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return ""
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}
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// User is logged in
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return email
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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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sess := store.Load(req)
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// renew token to avoid session pinning/fixation attack
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sess.RenewToken(w)
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sess.PutString(w, 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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var flashes []Flash
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sess := store.Load(req)
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if err := sess.GetObject(FlashesKey, &flashes); err != nil {
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return err
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}
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flashes = append(flashes, flash)
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return sess.PutObject(w, FlashesKey, flashes)
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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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var flashes []Flash
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sess := store.Load(req)
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sess.PopObject(w, FlashesKey, &flashes)
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return flashes
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}
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