package api import ( "errors" "net/http" "strings" "github.com/mediocregopher/blog.mediocregopher.com/srv/mailinglist" ) func (a *api) mailingListSubscribeHandler() http.Handler { return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) { email := r.PostFormValue("email") if parts := strings.Split(email, "@"); len(parts) != 2 || parts[0] == "" || parts[1] == "" || len(email) >= 512 { badRequest(rw, r, errors.New("invalid email")) return } err := a.params.MailingList.BeginSubscription(email) if errors.Is(err, mailinglist.ErrAlreadyVerified) { // just eat the error, make it look to the user like the // verification email was sent. } else if err != nil { internalServerError(rw, r, err) return } jsonResult(rw, r, struct{}{}) }) } func (a *api) mailingListFinalizeHandler() http.Handler { var errInvalidSubToken = errors.New("invalid subToken") return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) { subToken := r.PostFormValue("subToken") if l := len(subToken); l == 0 || l > 128 { badRequest(rw, r, errInvalidSubToken) return } err := a.params.MailingList.FinalizeSubscription(subToken) if errors.Is(err, mailinglist.ErrNotFound) { badRequest(rw, r, errInvalidSubToken) return } else if errors.Is(err, mailinglist.ErrAlreadyVerified) { // no problem } else if err != nil { internalServerError(rw, r, err) return } jsonResult(rw, r, struct{}{}) }) } func (a *api) mailingListUnsubscribeHandler() http.Handler { var errInvalidUnsubToken = errors.New("invalid unsubToken") return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) { unsubToken := r.PostFormValue("unsubToken") if l := len(unsubToken); l == 0 || l > 128 { badRequest(rw, r, errInvalidUnsubToken) return } err := a.params.MailingList.Unsubscribe(unsubToken) if errors.Is(err, mailinglist.ErrNotFound) { badRequest(rw, r, errInvalidUnsubToken) return } else if err != nil { internalServerError(rw, r, err) return } jsonResult(rw, r, struct{}{}) }) }