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authentication.go
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authentication.go
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package handlers
import (
"context"
"errors"
"log"
"net/http"
"github.com/cswank/store/internal/store"
"github.com/gorilla/securecookie"
)
var (
hashKey, blockKey []byte
sc *securecookie.SecureCookie
domain, authCookieName string
)
func Authentication(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
user, err := getUserFromCookie(req)
if err != nil && err != http.ErrNoCookie {
ctx := context.WithValue(req.Context(), "error", err)
req = req.WithContext(ctx)
} else {
ctx := context.WithValue(req.Context(), "user", user)
req = req.WithContext(ctx)
}
h.ServeHTTP(w, req)
})
}
func getCookie(email string) *http.Cookie {
val := map[string]string{
"email": email,
}
encoded, err := sc.Encode(authCookieName, val)
if err != nil {
log.Println("couldn't encode cookie", err)
}
return &http.Cookie{
Name: authCookieName,
Value: encoded,
Path: "/",
HttpOnly: true,
}
}
func getUserFromCookie(req *http.Request) (*store.User, error) {
user := &store.User{}
cookie, err := req.Cookie(authCookieName)
if err != nil {
return nil, err
}
var m map[string]string
err = sc.Decode(authCookieName, cookie.Value, &m)
if err != nil {
return nil, err
}
if m["email"] == "" {
return nil, errors.New("no way, eh")
}
user.Email = m["email"]
err = user.Fetch()
user.HashedPassword = []byte{}
return user, err
}