package msg import ( "bufio" "errors" "fmt" "net/url" "strings" "time" "git.sr.ht/~rjarry/aerc/lib" "git.sr.ht/~rjarry/aerc/log" "git.sr.ht/~rjarry/aerc/widgets" "github.com/emersion/go-message/mail" ) // Unsubscribe helps people unsubscribe from mailing lists by way of the // List-Unsubscribe header. type Unsubscribe struct{} func init() { register(Unsubscribe{}) } // Aliases returns a list of aliases for the :unsubscribe command func (Unsubscribe) Aliases() []string { return []string{"unsubscribe"} } // Complete returns a list of completions func (Unsubscribe) Complete(aerc *widgets.Aerc, args []string) []string { return nil } // Execute runs the Unsubscribe command func (Unsubscribe) Execute(aerc *widgets.Aerc, args []string) error { if len(args) != 1 { return errors.New("Usage: unsubscribe") } widget := aerc.SelectedTabContent().(widgets.ProvidesMessage) msg, err := widget.SelectedMessage() if err != nil { return err } headers := msg.RFC822Headers if !headers.Has("list-unsubscribe") { return errors.New("No List-Unsubscribe header found") } text, err := headers.Text("list-unsubscribe") if err != nil { return err } methods := parseUnsubscribeMethods(text) if len(methods) == 0 { return fmt.Errorf("no methods found to unsubscribe") } log.Debugf("unsubscribe: found %d methods", len(methods)) unsubscribe := func(method *url.URL) { log.Debugf("unsubscribe: trying to unsubscribe using %s", method.Scheme) var err error switch strings.ToLower(method.Scheme) { case "mailto": err = unsubscribeMailto(aerc, method) case "http", "https": err = unsubscribeHTTP(aerc, method) default: err = fmt.Errorf("unsubscribe: skipping unrecognized scheme: %s", method.Scheme) } if err != nil { aerc.PushError(err.Error()) } } var title string = "Select method to unsubscribe" if msg != nil && msg.Envelope != nil && len(msg.Envelope.From) > 0 { title = fmt.Sprintf("%s from %s", title, msg.Envelope.From[0]) } options := make([]string, len(methods)) for i, method := range methods { options[i] = method.Scheme } dialog := widgets.NewSelectorDialog( title, "Press to confirm or to cancel", options, 0, aerc.SelectedAccountUiConfig(), func(option string, err error) { aerc.CloseDialog() if err != nil { if errors.Is(err, widgets.ErrNoOptionSelected) { aerc.PushStatus("Unsubscribe: "+err.Error(), 5*time.Second) } else { aerc.PushError("Unsubscribe: " + err.Error()) } return } for _, m := range methods { if m.Scheme == option { unsubscribe(m) return } } aerc.PushError("Unsubscribe: selected method not found") }, ) aerc.AddDialog(dialog) return nil } // parseUnsubscribeMethods reads the list-unsubscribe header and parses it as a // list of angle-bracket <> deliminated URLs. See RFC 2369. func parseUnsubscribeMethods(header string) (methods []*url.URL) { r := bufio.NewReader(strings.NewReader(header)) for { // discard until < _, err := r.ReadSlice('<') if err != nil { return } // read until < m, err := r.ReadSlice('>') if err != nil { return } m = m[:len(m)-1] if u, err := url.Parse(string(m)); err == nil { methods = append(methods, u) } } } func unsubscribeMailto(aerc *widgets.Aerc, u *url.URL) error { widget := aerc.SelectedTabContent().(widgets.ProvidesMessage) acct := widget.SelectedAccount() if acct == nil { return errors.New("No account selected") } h := &mail.Header{} h.SetSubject(u.Query().Get("subject")) if to, err := mail.ParseAddressList(u.Opaque); err == nil { h.SetAddressList("to", to) } composer, err := widgets.NewComposer( aerc, acct, acct.AccountConfig(), acct.Worker(), "", h, nil, ) if err != nil { return err } composer.SetContents(strings.NewReader(u.Query().Get("body"))) composer.Tab = aerc.NewTab(composer, "unsubscribe") composer.FocusTerminal() return nil } func unsubscribeHTTP(aerc *widgets.Aerc, u *url.URL) error { confirm := widgets.NewSelectorDialog( "Do you want to open this link?", u.String(), []string{"No", "Yes"}, 0, aerc.SelectedAccountUiConfig(), func(option string, _ error) { aerc.CloseDialog() switch option { case "Yes": go func() { defer log.PanicHandler() mime := fmt.Sprintf("x-scheme-handler/%s", u.Scheme) if err := lib.XDGOpenMime(u.String(), mime, nil); err != nil { aerc.PushError("Unsubscribe:" + err.Error()) } }() default: aerc.PushError("Unsubscribe: link will not be opened") } }, ) aerc.AddDialog(confirm) return nil }