blog/internal/controllers/events/contact-auth.go

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package events
import (
"errors"
"net/http"
"strconv"
"strings"
"github.com/gorilla/mux"
"github.com/kirsle/blog/internal/log"
"github.com/kirsle/blog/internal/responses"
"github.com/kirsle/blog/internal/sessions"
"github.com/kirsle/blog/models/contacts"
"github.com/kirsle/blog/models/events"
)
// AuthedContact returns the current authenticated Contact, if any, on the session.
func AuthedContact(r *http.Request) (contacts.Contact, error) {
session := sessions.Get(r)
if contactID, ok := session.Values["contact-id"].(int); ok && contactID != 0 {
contact, err := contacts.Get(contactID)
return contact, err
}
return contacts.Contact{}, errors.New("not authenticated")
}
// contactAuthHandler listens at "/c/<contact secret>?e=<event id>"
//
// It is used in RSVP invite emails so when the user clicks the link, it auto
// authenticates their session as the contact ID using the contact secret
// (a randomly generated string in the DB). The ?e= param indicates an event
// ID to redirect to.
func contactAuthHandler(w http.ResponseWriter, r *http.Request) {
params := mux.Vars(r)
secret, ok := params["secret"]
if !ok {
responses.BadRequest(w, r, "Bad Request")
}
c, err := contacts.GetBySecret(secret)
if err != nil {
log.Error("contactAuthHandler (/c/<secret>): secret not found, don't know this user")
responses.Redirect(w, "/")
return
}
log.Info("contactAuthHandler: Contact %d (%s) is now authenticated", c.ID, c.Name())
// Authenticate the contact in the session.
session := sessions.Get(r)
session.Values["contact-id"] = c.ID
session.Values["c.name"] = c.Name() // comment form values auto-filled nicely
session.Values["c.email"] = c.Email
err = session.Save(r, w)
if err != nil {
log.Error("contactAuthHandler: save session error: %s", err)
}
// Did they give us an event ID?
eventIDStr := r.FormValue("e")
if eventIDStr != "" {
if eventID, err := strconv.Atoi(eventIDStr); err == nil {
event, err := events.Load(eventID)
if err != nil {
responses.FlashAndRedirect(w, r, "/", "Event %d not found", eventID)
return
}
// Redirect to the event.
responses.Redirect(w, "/e/"+event.Fragment)
return
}
}
// Redirect home I guess?
log.Error("contactAuthHandler: don't know where to send them (no ?e= param for event ID)")
responses.Redirect(w, "/")
}
func contactLogoutHandler(w http.ResponseWriter, r *http.Request) {
session := sessions.Get(r)
delete(session.Values, "contact-id")
session.Save(r, w)
if next := r.FormValue("next"); next != "" && strings.HasPrefix(next, "/") {
responses.Redirect(w, next)
} else {
responses.Redirect(w, "/")
}
}