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package msg
import (
"bufio"
"errors"
"fmt"
"net/url"
"strings"
"time"
"git.sr.ht/~rjarry/aerc/app"
"git.sr.ht/~rjarry/aerc/commands"
"git.sr.ht/~rjarry/aerc/config"
"git.sr.ht/~rjarry/aerc/lib"
"git.sr.ht/~rjarry/aerc/lib/log"
"github.com/emersion/go-message/mail"
)
// Unsubscribe helps people unsubscribe from mailing lists by way of the
// List-Unsubscribe header.
type Unsubscribe struct {
Edit bool `opt:"-e"`
NoEdit bool `opt:"-E"`
}
func init() {
commands.Register(Unsubscribe{})
}
func (Unsubscribe) Context() commands.CommandContext {
return commands.MESSAGE_LIST | commands.MESSAGE_VIEWER
}
// Aliases returns a list of aliases for the :unsubscribe command
func (Unsubscribe) Aliases() []string {
return []string{"unsubscribe"}
}
// Execute runs the Unsubscribe command
func (u Unsubscribe) Execute(args []string) error {
editHeaders := (config.Compose.EditHeaders || u.Edit) && !u.NoEdit
widget := app.SelectedTabContent().(app.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(method, editHeaders)
case "http", "https":
err = unsubscribeHTTP(method)
default:
err = fmt.Errorf("unsubscribe: skipping unrecognized scheme: %s", method.Scheme)
}
if err != nil {
app.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 := app.NewSelectorDialog(
title,
"Press <Enter> to confirm or <ESC> to cancel",
options, 0, app.SelectedAccountUiConfig(),
func(option string, err error) {
app.CloseDialog()
if err != nil {
if errors.Is(err, app.ErrNoOptionSelected) {
app.PushStatus("Unsubscribe: "+err.Error(),
5*time.Second)
} else {
app.PushError("Unsubscribe: " + err.Error())
}
return
}
for _, m := range methods {
if m.Scheme == option {
unsubscribe(m)
return
}
}
app.PushError("Unsubscribe: selected method not found")
},
)
app.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(u *url.URL, editHeaders bool) error {
widget := app.SelectedTabContent().(app.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 := app.NewComposer(
acct,
acct.AccountConfig(),
acct.Worker(),
editHeaders,
"",
h,
nil,
strings.NewReader(u.Query().Get("body")),
)
if err != nil {
return err
}
composer.Tab = app.NewTab(composer, "unsubscribe")
composer.FocusTerminal()
return nil
}
func unsubscribeHTTP(u *url.URL) error {
confirm := app.NewSelectorDialog(
"Do you want to open this link?",
u.String(),
[]string{"No", "Yes"}, 0, app.SelectedAccountUiConfig(),
func(option string, _ error) {
app.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, ""); err != nil {
app.PushError("Unsubscribe:" + err.Error())
}
}()
default:
app.PushError("Unsubscribe: link will not be opened")
}
},
)
app.AddDialog(confirm)
return nil
}
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